ToolStripPanel.cs source code in C# .NET

                        
Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / WinForms / Managed / System / WinForms / ToolStripPanel.cs / 1 / ToolStripPanel.cs
                        

                        
                            //#define DEBUG_PAINT 
//------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
/* 
*/ 

namespace System.Windows.Forms { 
    using System.Drawing;
    using System.Windows.Forms.Layout;
    using System.Collections.Specialized;
    using System.Collections; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis; 
    using System.Runtime.InteropServices;
    using System.ComponentModel.Design.Serialization; 
    using System.Security.Permissions;
    using System.Security;
    using System.Globalization;
    using System.Windows.Forms.Internal; 

    ///  
    [ComVisible(true)] 
    [ClassInterface(ClassInterfaceType.AutoDispatch)]
    [Designer("System.Windows.Forms.Design.ToolStripPanelDesigner, " + AssemblyRef.SystemDesign)] 
    [ToolboxBitmapAttribute(typeof(ToolStripPanel), "ToolStripPanel_standalone.bmp")]
    public class ToolStripPanel : ContainerControl, IArrangedElement {

 
        private Orientation orientation = Orientation.Horizontal;
        private Padding rowMargin = new Padding(3,0,0,0); 
        private ToolStripRendererSwitcher rendererSwitcher = null; 
        private Type currentRendererType = typeof(System.Type);
        private BitVector32 state = new BitVector32(); 
        private ToolStripContainer owner;


#if DEBUG 
            internal static TraceSwitch ToolStripPanelDebug = new TraceSwitch("ToolStripPanelDebug", "Debug code for rafting mouse movement");
            internal static TraceSwitch ToolStripPanelFeedbackDebug = new TraceSwitch("ToolStripPanelFeedbackDebug", "Debug code for rafting feedback"); 
            internal static TraceSwitch ToolStripPanelMissingRowDebug = new TraceSwitch("ToolStripPanelMissingRowDebug", "Debug code for rafting feedback"); 

#else 
        internal static TraceSwitch ToolStripPanelDebug;
        internal static TraceSwitch ToolStripPanelFeedbackDebug;
        internal static TraceSwitch ToolStripPanelMissingRowDebug;
#endif 

        [ThreadStatic] 
        private static Rectangle lastFeedbackRect = Rectangle.Empty; 

 
        // properties
        private static readonly int PropToolStripPanelRowCollection = PropertyStore.CreateKey();

        // states 
        private static readonly int stateLocked = BitVector32.CreateMask();
        private static readonly int stateBeginInit = BitVector32.CreateMask(stateLocked); 
        private static readonly int stateChangingZOrder = BitVector32.CreateMask(stateBeginInit); 
        private static readonly int stateInJoin = BitVector32.CreateMask(stateChangingZOrder);
        private static readonly int stateEndInit = BitVector32.CreateMask(stateInJoin); 
        private static readonly int stateLayoutSuspended  = BitVector32.CreateMask(stateEndInit);
        private static readonly int stateRightToLeftChanged =  BitVector32.CreateMask(stateLayoutSuspended);

 

        // events 
        internal static readonly Padding DragMargin = new Padding(10); 

        private static readonly object EventRendererChanged = new object(); 

        /// 
        public ToolStripPanel() {
            SuspendLayout(); 
            AutoScaleMode = AutoScaleMode.None;
            InitFlowLayout(); 
            this.AutoSize = true; 
            this.MinimumSize = Size.Empty; // consider 1,1
            this.state[stateLocked | stateBeginInit | stateChangingZOrder] = false; 
            this.TabStop = false;

            ToolStripManager.ToolStripPanels.Add(this);
            // not setting ControlStyles.AllPaintingInWmPaint as we dont do any painting in OnPaint... all 
            // is done in OnPaintBackground... so its better to show the rafting container in WM_ERASEBACKGROUND.
            SetStyle(ControlStyles.ResizeRedraw | ControlStyles.OptimizedDoubleBuffer | /*ControlStyles.AllPaintingInWmPaint |*/ControlStyles.SupportsTransparentBackColor, true); 
            SetStyle(ControlStyles.Selectable, false); 
            ResumeLayout(true);
        } 

        internal ToolStripPanel(ToolStripContainer owner)
            : this() {
            this.owner = owner; 
        }
 
        [ 
        Browsable(false),
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 

        ]
        public override bool AllowDrop {
            get { return base.AllowDrop; } 
            set { base.AllowDrop = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public override bool AutoScroll {
            get { return base.AutoScroll; } 
            set { base.AutoScroll = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public new Size AutoScrollMargin {
            get { return base.AutoScrollMargin; } 
            set { base.AutoScrollMargin = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public new Size AutoScrollMinSize {
            get { return base.AutoScrollMinSize; } 
            set { base.AutoScrollMinSize = value; }
        } 
 

        ///  
        [
            DefaultValue(true),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)
        ] 
        public override bool AutoSize {
            get { 
                return base.AutoSize; 
            }
            set { 
                base.AutoSize = value;
            }

        } 

 
        ///  
        /// Override base AutoSizeChanged to we can change visibility/browsability attributes
        [ 
        Browsable(true),
        EditorBrowsable(EditorBrowsableState.Always)
        ]
        public new event EventHandler AutoSizeChanged { 
            add {
                base.AutoSizeChanged += value; 
            } 
            remove {
                base.AutoSizeChanged -= value; 
            }
        }

        ///  
        protected override Padding DefaultPadding {
            get { return Padding.Empty; } 
        } 
        protected override Padding DefaultMargin {
            get { return Padding.Empty; } 
        }

        public Padding RowMargin {
            get { return rowMargin; } 
            set {
                rowMargin = value; 
                LayoutTransaction.DoLayout(this, this, "RowMargin"); 
            }
        } 

        /// 
        public override DockStyle Dock {
            get { 
                return base.Dock;
            } 
            set { 
                base.Dock = value;
 
                if (value == DockStyle.Left || value == DockStyle.Right) {
                    Orientation = Orientation.Vertical;
                }
                else { 
                    Orientation = Orientation.Horizontal;
                } 
            } 
        }
 
        internal Rectangle DragBounds {
            get {
                return LayoutUtils.InflateRect(this.ClientRectangle, DragMargin);
            } 
        }
 
        internal bool IsInDesignMode { 
            get {
                return DesignMode; 
            }

        }
 
        /// 
        public override LayoutEngine LayoutEngine { 
            get { 
                return FlowLayout.Instance;
            } 
        }

        /// 
        [ 
        DefaultValue(false),
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public bool Locked { 
            get {
                return state[stateLocked];
            }
            set { 
                state[stateLocked] = value;
            } 
        } 

 
        /// 
        public Orientation Orientation {
            get {
                return orientation; 
            }
            set { 
                if (orientation != value) { 
                    orientation = value;
                    rowMargin= LayoutUtils.FlipPadding(rowMargin); 
                    InitFlowLayout();
                    foreach (ToolStripPanelRow row in this.RowsInternal) {
                        row.OnOrientationChanged();
                    } 
                }
            } 
        } 

        private ToolStripRendererSwitcher RendererSwitcher { 
            get {
                if (rendererSwitcher == null) {
                    rendererSwitcher = new ToolStripRendererSwitcher(this);
                    HandleRendererChanged(this, EventArgs.Empty); 
                    rendererSwitcher.RendererChanged += new EventHandler(HandleRendererChanged);
                } 
                return rendererSwitcher; 
            }
        } 

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        // PM team has reviewed and decided on naming changes already 
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
        public ToolStripRenderer Renderer { 
            get { 
                return RendererSwitcher.Renderer;
            } 
            set {
                RendererSwitcher.Renderer = value;
            }
        } 

 
        ///  
        [
        SRDescription(SR.ToolStripRenderModeDescr), 
        SRCategory(SR.CatAppearance),
        ]
        public ToolStripRenderMode RenderMode {
            get { 
                return RendererSwitcher.RenderMode;
            } 
            set { 
                RendererSwitcher.RenderMode = value;
            } 
        }

        [SRCategory(SR.CatAppearance), SRDescription(SR.ToolStripRendererChanged)]
        // PM team has reviewed and decided on naming changes already 
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
        public event EventHandler RendererChanged { 
            add { 
                Events.AddHandler(EventRendererChanged, value);
            } 
            remove {
                Events.RemoveHandler(EventRendererChanged, value);
            }
        } 

        ///  
        ///  
        /// Collection of child controls.
        ///  
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        SRDescription(SR.ToolStripPanelRowsDescr) 
        ]
        internal ToolStripPanelRowCollection RowsInternal { 
            get { 
                ToolStripPanelRowCollection rowCollection = (ToolStripPanelRowCollection)Properties.GetObject(PropToolStripPanelRowCollection);
 
                if (rowCollection == null) {
                    rowCollection = CreateToolStripPanelRowCollection();
                    Properties.SetObject(PropToolStripPanelRowCollection, rowCollection);
                } 
                return rowCollection;
            } 
        } 

        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        SRDescription(SR.ToolStripPanelRowsDescr),
        SuppressMessage("Microsoft.Performance", "CA1819:PropertiesShouldNotReturnArrays") 
        ]
 
        public ToolStripPanelRow[] Rows { 
            get {
                ToolStripPanelRow[] rows = new ToolStripPanelRow[RowsInternal.Count]; 
                RowsInternal.CopyTo(rows,0);
                return rows;
            }
        } 

 
        ///  
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public new int TabIndex { 
            get {
                return base.TabIndex; 
            } 
            set {
                base.TabIndex = value; 
            }
        }

        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event EventHandler TabIndexChanged { 
            add { 
                base.TabIndexChanged += value;
            } 
            remove {
                base.TabIndexChanged -= value;
            }
        } 

        ///  
        [ 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public new bool TabStop {
            get { 
                return base.TabStop;
            } 
            set { 
                base.TabStop = value;
            } 
        }

        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 
        public new event EventHandler TabStopChanged {
            add { 
                base.TabStopChanged += value; 
            }
            remove { 
                base.TabStopChanged -= value;
            }
        }
 
        /// 
        [ 
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public override string Text {
            get {
                return base.Text; 
            }
            set { 
                base.Text = value; 
            }
        } 

        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event EventHandler TextChanged { 
            add {
                base.TextChanged += value; 
            } 
            remove {
                base.TextChanged -= value; 
            }
        }

 
        #region ISupportInitialize
 
        public void BeginInit() { 
            state[stateBeginInit] = true;
        } 


        public void EndInit() {
            state[stateBeginInit] = false; 
            state[stateEndInit] = true;
            try { 
                if (!state[stateInJoin]) { 
                    JoinControls();
                } 
            }
            finally {
                state[stateEndInit] = false;
            } 

        } 
 
        #endregion ISupportInitialize
 

        /// 
        private ToolStripPanelRowCollection CreateToolStripPanelRowCollection() {
            return new ToolStripPanelRowCollection(this); 
        }
 
        protected override Control.ControlCollection CreateControlsInstance() { 
            return new ToolStripPanelControlCollection(this);
        } 



        ///  
        /// 
        ///    Disposes of the resources (other than memory) used by 
        ///       the  
        ///       .
        ///  
        protected override void Dispose(bool disposing) {
            if (disposing) {
                ToolStripManager.ToolStripPanels.Remove(this);
            } 
            base.Dispose(disposing);
        } 
 
        private void InitFlowLayout() {
            if (Orientation == Orientation.Horizontal) { 
                FlowLayout.SetFlowDirection(this, FlowDirection.TopDown);
            }
            else {
                FlowLayout.SetFlowDirection(this, FlowDirection.LeftToRight); 
            }
            FlowLayout.SetWrapContents(this, false); 
 
        }
        private Point GetStartLocation(ToolStrip toolStripToDrag) { 
            if (toolStripToDrag.IsCurrentlyDragging
                && Orientation == Orientation.Horizontal
                && toolStripToDrag.RightToLeft == RightToLeft.Yes ) {
                // the grip is on the right side, not left. 
                return new Point(toolStripToDrag.Right,toolStripToDrag.Top);
            } 
            return toolStripToDrag.Location; 
        }
 
        private void HandleRendererChanged(object sender, EventArgs e) {
            OnRendererChanged(e);
        }
 

 
 
#if DEBUG_PAINT
                ///  
                protected  override void OnPaint(PaintEventArgs e) {
                    base.OnPaint(e);
                    Graphics g = e.Graphics;
                    foreach (ToolStripPanelRow row in this.RowsInternal) { 
                        g.DrawRectangle(SystemPens.Highlight, row.Bounds);
                        row.PaintColumns(e); 
                    } 
                }
#endif 

        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected override void OnPaintBackground(PaintEventArgs e) {
            ToolStripPanelRenderEventArgs rea =  new ToolStripPanelRenderEventArgs(e.Graphics, this); 
            Renderer.DrawToolStripPanelBackground(rea);
 
            if (!rea.Handled) { 
                base.OnPaintBackground(e);
            } 
        }

        protected override void OnControlAdded(ControlEventArgs e) {
            base.OnControlAdded(e); 

            if (!state[stateBeginInit] && !state[stateInJoin]) { 
                if (!state[stateLayoutSuspended]) { 
                    this.Join(e.Control as ToolStrip, e.Control.Location);
                } 
                else {
                    BeginInit();
                }
            } 

        } 
 
        protected override void OnControlRemoved(ControlEventArgs e) {
            ISupportToolStripPanel controlToBeDragged = e.Control as ISupportToolStripPanel; 

            if (controlToBeDragged != null) {
                if (controlToBeDragged.ToolStripPanelRow != null/* && controlToBeDragged.ToolStripPanelRow != owner*/) {
                    controlToBeDragged.ToolStripPanelRow.ControlsInternal.Remove(e.Control); 
                }
            } 
            base.OnControlRemoved(e); 
        }
 
        /// 
        protected override void OnLayout(LayoutEventArgs e) {
            if (e.AffectedComponent != ParentInternal && e.AffectedComponent as Control != null) {
                ISupportToolStripPanel draggedControl = e.AffectedComponent as ISupportToolStripPanel; 
                if (draggedControl != null && this.RowsInternal.Contains(draggedControl.ToolStripPanelRow)) {
                    // there's a problem in the base onlayout... if toolstrip needs more space it talks to us 
                    // not the row that needs layout. 
                    LayoutTransaction.DoLayout(draggedControl.ToolStripPanelRow, e.AffectedComponent as IArrangedElement, e.AffectedProperty);
                } 
            }
            base.OnLayout(e);
        }
 
        internal override void OnLayoutSuspended() {
            base.OnLayoutSuspended(); 
            state[stateLayoutSuspended] = true; 

        } 

        internal override void OnLayoutResuming(bool resumeLayout) {
            base.OnLayoutResuming(resumeLayout);
            state[stateLayoutSuspended] = false; 
            if (state[stateBeginInit]) {
                EndInit(); 
            } 
        }
 
        protected override void OnRightToLeftChanged(EventArgs e) {
            base.OnRightToLeftChanged(e);

            if (!state[stateBeginInit]) { 
                if (Controls.Count > 0) {
                    // rejoin the controls on the other side of the toolstrippanel. 
                    SuspendLayout(); 
                    Control[] controls = new Control[this.Controls.Count];
                    Point[] controlLocations = new Point[this.Controls.Count]; 
                    int j = 0;
                    foreach (ToolStripPanelRow row in this.RowsInternal) {
                        foreach (Control control in row.ControlsInternal) {
                            controls[j] = control; 
                            controlLocations[j] = new Point(row.Bounds.Width - control.Right, control.Top);
                            j++; 
                        } 
                    }
 
                    this.Controls.Clear();

                    for ( int i = 0; i < controls.Length; i++) {
                        Join(controls[i] as ToolStrip, controlLocations[i]); 
                    }
 
                    ResumeLayout(true); 
                }
            } 
            else {
                state[stateRightToLeftChanged] = true;
            }
 
        }
 
        ///  
        // PM team has reviewed and decided on naming changes already
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")] 
        protected virtual void OnRendererChanged(EventArgs e) {
            Renderer.InitializePanel(this);

            this.Invalidate(); 

            EventHandler handler = (EventHandler)Events[EventRendererChanged]; 
            if (handler != null) handler(this, e); 

        } 

        /// 
        /// 
        /// We want to Set ToolStripPanel at DesignTime when the ToolStripPanel is added to the Form, 
        /// 
        protected override void OnParentChanged(EventArgs e) { 
            PerformUpdate(); 
            base.OnParentChanged(e);
        } 

        protected override void OnDockChanged(EventArgs e) {
            PerformUpdate();
            base.OnDockChanged(e); 
        }
 
 
        internal void PerformUpdate() {
            PerformUpdate(false); 
        }
        internal void PerformUpdate(bool forceLayout) {

            if (!state[stateBeginInit] && !state[stateInJoin]) { 
                JoinControls(forceLayout);
            } 
 
        }
        private void ResetRenderMode() { 
           RendererSwitcher.ResetRenderMode();
        }

        private bool ShouldSerializeRenderMode() { 
            return RendererSwitcher.ShouldSerializeRenderMode();
        } 
 
        private bool ShouldSerializeDock() {
            return (owner == null && (Dock != DockStyle.None)); 
        }

        private void JoinControls() {
            JoinControls(false); 
        }
        private void JoinControls(bool forceLayout) { 
            // undone: config - shift to other container 
            ToolStripPanelControlCollection controls = this.Controls as ToolStripPanelControlCollection;
            if (controls.Count > 0) { 
                controls.Sort();

                // since Join is going to mess with our order - make a copy. (ugh).
                Control[] controlArray = new Control[controls.Count]; 
                controls.CopyTo(controlArray, 0);
                for (int i = 0; i < controlArray.Length; i++) { 
                    int numRows = RowsInternal.Count; 
                    ISupportToolStripPanel draggedControl = controlArray[i] as ISupportToolStripPanel;
 
                    if (draggedControl != null && draggedControl.ToolStripPanelRow != null && !draggedControl.IsCurrentlyDragging) {
                        ToolStripPanelRow row = draggedControl.ToolStripPanelRow;
                        if (row.Bounds.Contains(controlArray[i].Location)) {
                            // this toolstrip does not require join. 
                            continue;
                        } 
                    } 
                    if (controlArray[i].AutoSize) {
                        controlArray[i].Size = controlArray[i].PreferredSize; 
                    }
                    Point controlLocation = controlArray[i].Location;

                    // right to left has changed while layout was deferred... 
                    if (state[stateRightToLeftChanged]) {
                        controlLocation = new Point(this.Width - controlArray[i].Right, controlLocation.Y); 
                    } 
                    this.Join(controlArray[i] as ToolStrip, controlArray[i].Location);
                    if (numRows < RowsInternal.Count || forceLayout) { 
                        // OK this is wierd but here we're in the midst of a suspend layout.
                        // the only way we can deterministically place these guys is to force a layout
                        // each time we've added a new row.  Otherwise we wont find the correct
                        // row to add the control to (PointToRow will fail as Row.Bounds isnt set yet) 
                        OnLayout(new LayoutEventArgs(this, PropertyNames.Rows));
                    } 
                } 
            }
            state[stateRightToLeftChanged] = false; 

        }

        #region Feedback 

        [ThreadStatic] 
        private static FeedbackRectangle feedbackRect; 

        private void GiveToolStripPanelFeedback(ToolStrip toolStripToDrag, Point screenLocation) { 

            if (Orientation == Orientation.Horizontal && RightToLeft == RightToLeft.Yes) {
                // paint the feedback in the correct location when RTL.Yes
                screenLocation.Offset(-toolStripToDrag.Width,0); 
            }
            if (CurrentFeedbackRect == null) { 
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: creating NEW feedback at " + screenLocation.ToString()); 

                CurrentFeedbackRect = new FeedbackRectangle(toolStripToDrag.ClientRectangle); 
            }

            if (!CurrentFeedbackRect.Visible) {
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: Showing NEW feedback at " + screenLocation.ToString()); 
                toolStripToDrag.SuspendCaputureMode();
                try { 
                    CurrentFeedbackRect.Show(screenLocation); 
                    toolStripToDrag.CaptureInternal = true;
                } 
                finally {
                    toolStripToDrag.ResumeCaputureMode();
                }
            } 
            else {
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: Moving feedback to " + screenLocation.ToString()); 
                CurrentFeedbackRect.Move(screenLocation); 

            } 
        }


 
        internal static void ClearDragFeedback() {
#if DEBUG 
            if (ToolStripPanelFeedbackDebug.TraceVerbose){ 
               Debug.WriteLine("FEEDBACK:  clearing old feedback at "/*+ new StackTrace().ToString()*/);
            } 
#endif
            FeedbackRectangle oldFeedback = feedbackRect;
            feedbackRect = null;
            if (oldFeedback != null) { 
                oldFeedback.Dispose();
            } 
 
        }
 

        private static FeedbackRectangle CurrentFeedbackRect {
            get {
                return feedbackRect; 
            }
            set { 
                feedbackRect = value; 
            }
        } 


        // The FeedbackRectangle happens to encapsulate a toolstripdropdown
        // with a special region. The feedback rectangle exposes the minimum 
        // API so the underlying implementation can be replaced if necessary.
        private class FeedbackRectangle : IDisposable { 
            private FeedbackDropDown dropDown; 

            public FeedbackRectangle(Rectangle bounds) { 
                dropDown = new FeedbackDropDown(bounds);

            }
            public bool Visible { 
                get {
                    if (dropDown != null && !dropDown.IsDisposed) { 
                        return dropDown.Visible; 
                    }
                    return false; 
                }
                set {
                    if (dropDown != null && !dropDown.IsDisposed) {
                        dropDown.Visible = value; 
                    }
                } 
            } 

            public void Show(Point newLocation) { 
                dropDown.Show(newLocation);
            }
            public void Move(Point newLocation) {
               dropDown.MoveTo(newLocation); 
            }
 
            protected void Dispose(bool disposing) { 
                if (disposing) {
                   if (dropDown != null) { 
                        Visible = false;
                        dropDown.Dispose();
                        dropDown = null;
                   } 
                }
            } 
 
            public void Dispose() {
                Dispose(true); 
            }

            ~FeedbackRectangle() {
                Dispose(false); 
            }
 
            private class FeedbackDropDown : ToolStripDropDown { 

                private const int MAX_PAINTS_TO_SERVICE = 20; 
                private int _numPaintsServiced = 0; // member variable to protect against re-entrancy

                public FeedbackDropDown(Rectangle bounds) : base(){
                    SetStyle(ControlStyles.AllPaintingInWmPaint, false); 
                    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
                    SetStyle(ControlStyles.CacheText, true); 
                    this.AutoClose = false; 
                    this.AutoSize = false;
                    this.DropShadowEnabled = false; 
                    this.Bounds = bounds;

                    // caching as this is unlikely to change during the lifetime
                    // of the dropdown. 

                    Rectangle regionRect = bounds;    //create a region the size of the client area 
                    regionRect.Inflate(-1,-1);        //squish down by one pixel 

                    Region rgn = new Region(bounds);  // create region 
                    rgn.Exclude(regionRect);          // exclude the center part

                    // set it into the toolstripdropdown’s region
                    IntSecurity.ChangeWindowRegionForTopLevel.Assert(); 
                    this.Region = rgn;
                    // RevertAssert automatically called here when exiting function. 
 
                }
 
                // ForceSynchronousPaint - peeks through the message queue, looking for WM_PAINTs
                // calls UpdateWindow on the hwnd to force the paint to happen now.
                //
                // When we're changing the location of the feedback dropdown, we need to 
                // force WM_PAINTS to happen, as things that dont respond to WM_ERASEBKGND
                // have bits of the dropdown region drawn all over them. 
                private void ForceSynchronousPaint() { 
                    if (!IsDisposed) {
                        if (_numPaintsServiced == 0) { // protect against re-entrancy. 
                            try {
                                NativeMethods.MSG msg = new NativeMethods.MSG();
                                while (UnsafeNativeMethods.PeekMessage(ref msg, new HandleRef(this, IntPtr.Zero),
                                                           NativeMethods.WM_PAINT, NativeMethods.WM_PAINT, 
                                                           NativeMethods.PM_REMOVE)) {
                                    SafeNativeMethods.UpdateWindow(new HandleRef(null, msg.hwnd)); 
 
                                    // Infinite loop protection
                                    if (_numPaintsServiced++ > MAX_PAINTS_TO_SERVICE) { 
                                        Debug.Fail("somehow we've gotten ourself in a situation where we're pumping an unreasonable number of paint messages, investigate.");
                                        break;
                                    }
                                } 
                            }
                            finally { 
                                _numPaintsServiced = 0; 
                            }
                        } 
                    }
                }

                protected override void OnPaint(PaintEventArgs e) { 
                }
                protected override void OnPaintBackground(PaintEventArgs e) { 
                    // respond to everything in WM_ERASEBKGND 
                    Renderer.DrawToolStripBackground(new ToolStripRenderEventArgs(e.Graphics, this));
                    Renderer.DrawToolStripBorder(new ToolStripRenderEventArgs(e.Graphics, this)); 
                }
                protected override void OnOpening(CancelEventArgs e) {
                    base.OnOpening(e);
                    e.Cancel = false; 
                }
 
                public void MoveTo(Point newLocation) { 
                    this.Location = newLocation;
                    // if we dont force a paint here, we'll only send WM_ERASEBKGNDs right away 
                    // and leave rectangles all over controls that dont respond to that window message.
                    ForceSynchronousPaint();
                }
 
                [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
                protected override void WndProc(ref Message m){ 
                    if (m.Msg == NativeMethods.WM_NCHITTEST){ 
                        m.Result = (IntPtr)NativeMethods.HTTRANSPARENT;
                    } 
                    base.WndProc(ref m);
                }
            }
        } 

        #endregion Feedback 
 
        #region JoinAndMove
 
        public void Join(ToolStrip toolStripToDrag) {
            Join(toolStripToDrag, Point.Empty);
        }
 
        public void Join(ToolStrip toolStripToDrag, int row) {
            if (row < 0) { 
                throw new ArgumentOutOfRangeException("row", SR.GetString(SR.IndexOutOfRange, row.ToString(CultureInfo.CurrentCulture))); 
            }
 
            Point location = Point.Empty;
            Rectangle dragRect = Rectangle.Empty;
            if (row >= RowsInternal.Count) {
                dragRect = DragBounds; 
            }
            else { 
                dragRect = this.RowsInternal[row].DragBounds; 
            }
 
            if (Orientation == Orientation.Horizontal) {
                location = new Point(0, dragRect.Bottom -1);
            }
            else { 
                location = new Point(dragRect.Right -1, 0);
            } 
 
            Join(toolStripToDrag, location);
 
        }

        public void Join(ToolStrip toolStripToDrag, int x, int y) {
            Join(toolStripToDrag, new Point(x, y)); 
        }
 
        [ 
            SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using ToolStrip instead of Control intentionally
        ] 
        public void Join(ToolStrip toolStripToDrag, Point location) {
            if (toolStripToDrag == null) {
                throw new ArgumentNullException("toolStripToDrag");
            } 
            if (!state[stateBeginInit] && !state[stateInJoin]) {
                try { 
                    state[stateInJoin] = true; 
                    toolStripToDrag.ParentInternal = this;
                    MoveInsideContainer(toolStripToDrag, location); 
                }
                finally {
                    state[stateInJoin] = false;
                } 
            }
            else { 
                this.Controls.Add(toolStripToDrag); 
                toolStripToDrag.Location = location;
            } 
        }

        internal void MoveControl(ToolStrip toolStripToDrag, Point screenLocation) {
            ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel; 

            if (draggedControl == null) { 
                Debug.Fail("Move called on immovable object."); 
                return;
            } 

            Point clientLocation = PointToClient(screenLocation);
            if (!this.DragBounds.Contains(clientLocation)) {
                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "RC.MoveControl - Point {0} is not in current rafting container drag bounds {1}, calling MoveOutsideContainer", clientLocation, DragBounds)); 
                MoveOutsideContainer(toolStripToDrag, screenLocation);
                return; 
            } 
            else {
                Join(toolStripToDrag as ToolStrip, clientLocation); 
            }
        }

        private void MoveInsideContainer(ToolStrip toolStripToDrag, Point clientLocation) { 
            ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel;
            // if the point is not in this rafting container forward on to the appropriate container. 
 
            if (draggedControl.IsCurrentlyDragging && !this.DragBounds.Contains(clientLocation)) {
                return; 
            }

            // we know we're moving inside the container.
 
            bool changedRow = false;
 
            ClearDragFeedback(); 

            // VSWhidbey 439542 - in design mode we get bogus values for client location. 
            if (toolStripToDrag.Site != null && toolStripToDrag.Site.DesignMode && IsHandleCreated) {

                if (clientLocation.X < 0 || clientLocation.Y < 0) {
                    Point currentCursorLoc = PointToClient(WindowsFormsUtils.LastCursorPoint); 
                    if (ClientRectangle.Contains(currentCursorLoc)) {
                        clientLocation = currentCursorLoc; 
                    } 
                }
            } 


            //
            // Point INSIDE this rafting container 
            //
 
            ToolStripPanelRow currentToolStripPanelRow = draggedControl.ToolStripPanelRow; 

#if DEBUG 
            bool debugModeOnly_ChangedContainers = currentToolStripPanelRow != null ?
                                (currentToolStripPanelRow.ToolStripPanel != this) : true;
#endif
 
            if (currentToolStripPanelRow != null && currentToolStripPanelRow.Visible && currentToolStripPanelRow.ToolStripPanel == this && currentToolStripPanelRow.DragBounds.Contains(clientLocation)) {
                // Point INSIDE same rafting row 
                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, "RC.MoveControl - Point  " + clientLocation + "is in the same row as the control" + draggedControl.ToolStripPanelRow.DragBounds); 
                draggedControl.ToolStripPanelRow.MoveControl(toolStripToDrag, GetStartLocation(toolStripToDrag), clientLocation);
            } 
            else {
                // Point OUTSIDE current rafting row.

 

                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, "RC.MoveControl - Point " + clientLocation + " is outside the current rafting row."); 
 
                ToolStripPanelRow row = PointToRow(clientLocation);
                if (row == null) { 
                    Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tThere is no row corresponding to this point, creating a new one."));

                    // there's no row at this point so lets create one
                    int index = this.RowsInternal.Count; 

                    if (Orientation == Orientation.Horizontal) { 
                        // if it's above the first row, insert at the front. 
                        index = (clientLocation.Y <= this.Padding.Left) ? 0 : index;
                    } 
                    else { // Orientation.Vertical
                        // if it's before the first row, insert at the front.
                        index = (clientLocation.X <= this.Padding.Left) ? 0 : index;
                    } 

                    ToolStripPanelRow previousRow = null; 
                    if (this.RowsInternal.Count > 0) { 
                        if (index == 0) {
                            previousRow = this.RowsInternal[0]; 
                        }
                        else if (index > 0) {
                            previousRow = this.RowsInternal[index - 1];
                        } 
                    }
                    if (previousRow != null /* there was a previous row */ 
                        && previousRow.ControlsInternal.Count == 1 /*toolStripToDrag*/ 
                        && previousRow.ControlsInternal.Contains(toolStripToDrag)) {
                        // if the previous row already contains this control 
                        // it's futile to create a new row, we're just going to wind
                        // up disposing this one and causing great amounts of flicker.
                        row = previousRow;
 
                        Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, "Reusing previous row");
                        // Move the ToolStrip to the new Location in the existing row. 
                        if (toolStripToDrag.IsInDesignMode)  { 
                            Point endLocation = (Orientation == Orientation.Horizontal) ? new Point (clientLocation.X, row.Bounds.Y) :  new Point (row.Bounds.X, clientLocation.Y);
                            draggedControl.ToolStripPanelRow.MoveControl(toolStripToDrag, GetStartLocation(toolStripToDrag), endLocation); 
                        }
                    }
                    else {
                        // Create a new row and insert it. 
                        //
                        Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, "Inserting a new row at " + index.ToString(CultureInfo.InvariantCulture)); 
                        row = new ToolStripPanelRow(this); 
                        this.RowsInternal.Insert(index, row);
 
                    }
                }
                else if (!row.CanMove(toolStripToDrag)) {
                    Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tThere was a row, but we cant add the control to it, creating/inserting new row.")); 

                    // we have a row at that point, but its too full or doesnt want 
                    // anyone to join it. 
                    int index = RowsInternal.IndexOf(row);
 
                    if (currentToolStripPanelRow != null && currentToolStripPanelRow.ControlsInternal.Count == 1) {
                        if (index > 0 && index-1 == RowsInternal.IndexOf(currentToolStripPanelRow)) {
                            Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tAttempts to leave the current row failed as there's no space in the next row.  Since there's only one control, just keep the row."));
                            return; 
                        }
                    } 
                    row = new ToolStripPanelRow(this); 
                    this.RowsInternal.Insert(index, row);
                    clientLocation.Y = row.Bounds.Y; 
                }

                changedRow = (currentToolStripPanelRow != row);
                if (!changedRow) { 
                    if (currentToolStripPanelRow != null && currentToolStripPanelRow.ControlsInternal.Count >1) {
                        // force a leave/re-enter to occur. 
                        currentToolStripPanelRow.LeaveRow(toolStripToDrag); 
                        currentToolStripPanelRow = null;
                        changedRow = true; 
                    }
                }
                if (changedRow) {
                    Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tCalling JoinRow.")); 
                    if (currentToolStripPanelRow != null) {
                        currentToolStripPanelRow.LeaveRow(toolStripToDrag); 
                    } 
                    row.JoinRow(toolStripToDrag, clientLocation);
                } 

                if (changedRow && draggedControl.IsCurrentlyDragging) {
                    // force the layout of the new row.
                    for (int i = 0; i < RowsInternal.Count; i++) { 
                        LayoutTransaction.DoLayout(RowsInternal[i], this, PropertyNames.Rows);
                    } 
 

                    if (RowsInternal.IndexOf(row) > 0) { 
                        // VSWhidbey 327225 - when joining a new row, move the cursor to to the location of
                        // the grip, otherwise budging the mouse can pull it down into the next row.
                        IntSecurity.AdjustCursorPosition.Assert();
                        try { 
                            Point cursorLoc = toolStripToDrag.PointToScreen(toolStripToDrag.GripRectangle.Location);
                            if (Orientation == Orientation.Vertical) { 
                                cursorLoc.X += toolStripToDrag.GripRectangle.Width /2; 
                                cursorLoc.Y = Cursor.Position.Y;
                            } 
                            else {
                                cursorLoc.Y += toolStripToDrag.GripRectangle.Height /2;
                                cursorLoc.X = Cursor.Position.X;
                            } 
                            Cursor.Position = cursorLoc;
                        } 
                        finally { 
                            CodeAccessPermission.RevertAssert();
                        } 
                    }
                }

            } 

 
#if DEBUG 
            Debug_VerifyOneToOneCellRowControlMatchup();
//            Debug_VerifyCountRows(); 
            if (draggedControl.IsCurrentlyDragging && changedRow && !debugModeOnly_ChangedContainers) {
                // if we have changed containers, we're in a SuspendLayout.
                Debug_VerifyNoOverlaps();
            } 
#endif
        } 
 
        private void MoveOutsideContainer(ToolStrip toolStripToDrag, Point screenLocation) {
 
            // look for another rafting container.
            ToolStripPanel panel = ToolStripManager.ToolStripPanelFromPoint(toolStripToDrag, screenLocation);
            if (panel != null) {
                using (new LayoutTransaction(panel, panel, null)) { 
                    panel.MoveControl(toolStripToDrag, screenLocation);
                } 
                toolStripToDrag.PerformLayout(); 
#if DEBUG
                ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel; 
                if (draggedControl.IsCurrentlyDragging) {
                    Debug_VerifyNoOverlaps();
                }
#endif 
            }
            else { 
                GiveToolStripPanelFeedback(toolStripToDrag, screenLocation); 
            }
 
        }

        /// 
        ///  
        /// Given a point within the ToolStripPanel client area -
        /// it returns the row.  If no such row exists, returns null 
        ///  
        public ToolStripPanelRow PointToRow(Point clientLocation) {
            // PERF: since we're using the PropertyStore for this.RowsInternal, its actually 
            // faster to use foreach.
            foreach (ToolStripPanelRow row in this.RowsInternal) {
                Rectangle bounds = LayoutUtils.InflateRect(row.Bounds, row.Margin);
 
                // at this point we may not be sized correctly.  Guess.
                if (ParentInternal != null) { 
                    if (Orientation == Orientation.Horizontal && (bounds.Width == 0)) { 
                        bounds.Width = ParentInternal.DisplayRectangle.Width;
                    } 
                    else if (Orientation == Orientation.Vertical && (bounds.Height == 0)) {
                        bounds.Height = ParentInternal.DisplayRectangle.Height;
                    }
                } 

 
                if (bounds.Contains(clientLocation)) { 
                    return row;
                } 
            }
            return null;
        }
 

        #endregion JoinAndMove 
 

        [Conditional("DEBUG")] 
        private void Debug_VerifyOneToOneCellRowControlMatchup() {
            for (int i = 0; i < this.RowsInternal.Count; i++) {
                ToolStripPanelRow row = this.RowsInternal[i];
                foreach (ToolStripPanelCell cell in row.Cells) { 

                    if (cell.Control != null) { 
                        ToolStripPanelRow currentlyAssignedRow = ((ISupportToolStripPanel)cell.Control).ToolStripPanelRow; 
                        if (currentlyAssignedRow != row) {
                            int goodRowIndex = (currentlyAssignedRow != null) ? RowsInternal.IndexOf(currentlyAssignedRow) : -1; 
                            if (goodRowIndex == -1) {
                                Debug.Fail(String.Format(CultureInfo.CurrentCulture, "ToolStripPanelRow has not been assigned!  Should be set to {0}.", i));
                            }
                            else { 
                                Debug.Fail(String.Format(CultureInfo.CurrentCulture, "Detected orphan cell! {0} is in row {1}. It shouldnt have a cell in {2}! \r\n\r\nTurn on DEBUG_PAINT in ToolStripPanel and ToolStripPanelRow to investigate.", cell.Control.Name, goodRowIndex, i));
                            } 
                        } 
                    }
                    else { 
                        Debug.Fail("why do we have a cell with a null control in this row?");
                    }
                }
            } 
        }
 
        [Conditional("DEBUG")] 
        private void Debug_PrintRows() {
           for (int i = 0; i < RowsInternal.Count; i++) { 
                Debug.Write("Row " + i.ToString(CultureInfo.CurrentCulture) + ": ");
                for (int  j = 0; j < RowsInternal[i].ControlsInternal.Count; j++) {
                    Debug.Write(String.Format(CultureInfo.CurrentCulture, "[{0} {1}] ", RowsInternal[i].ControlsInternal[j].Name, ((ToolStripPanelCell)RowsInternal[i].Cells[j]).Margin));
                } 
                Debug.Write("\r\n");
           } 
        } 

        [Conditional("DEBUG")] 
        private void Debug_VerifyCountRows() {
            Debug.Assert(RowsInternal.Count <= Controls.Count, "How did the number of rows get larger than the number of controls?");
        }
 
        [Conditional("DEBUG")]
        private void Debug_VerifyNoOverlaps() { 
            foreach (Control c1 in this.Controls) { 
                foreach (Control c2 in this.Controls) {
                    if (c1 == c2) { 
                        continue;
                    }
                    Rectangle intersection = c1.Bounds;
                    intersection.Intersect(c2.Bounds); 

                    if (!LayoutUtils.IsZeroWidthOrHeight(intersection)) { 
                        ISupportToolStripPanel draggedToolStrip1 = c1 as ISupportToolStripPanel; 
                        ISupportToolStripPanel draggedToolStrip2 = c2 as ISupportToolStripPanel;
 
                        string fail = String.Format(CultureInfo.CurrentCulture,
                            "OVERLAP detection:\r\n{0}: {1} row {2} row bounds {3}",
                            c1.Name == null ? "" : c1.Name,
                            c1.Bounds, 
                            !RowsInternal.Contains(draggedToolStrip1.ToolStripPanelRow) ? "unknown" : RowsInternal.IndexOf(draggedToolStrip1.ToolStripPanelRow).ToString(CultureInfo.CurrentCulture),
                            draggedToolStrip1.ToolStripPanelRow.Bounds); 
 
                         fail += String.Format(CultureInfo.CurrentCulture,
                             "\r\n{0}: {1} row {2} row bounds {3}", 
                             c2.Name == null ? "" : c2.Name,
                             c2.Bounds,
                             !RowsInternal.Contains(draggedToolStrip2.ToolStripPanelRow) ? "unknown" : RowsInternal.IndexOf(draggedToolStrip2.ToolStripPanelRow).ToString(CultureInfo.CurrentCulture),
                             draggedToolStrip2.ToolStripPanelRow.Bounds); 
                        Debug.Fail(fail);
 
                    } 
                }
 
            }

        }
 
        /// 
        ///  
        ArrangedElementCollection IArrangedElement.Children { 
            get {
                return RowsInternal; 
            }
        }

        ///  
        [
        ListBindable(false), 
        ComVisible(false) 
        ]
        [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")] 
        public class ToolStripPanelRowCollection : ArrangedElementCollection, IList {

            private ToolStripPanel owner;
            ///  
            public ToolStripPanelRowCollection(ToolStripPanel owner) {
                this.owner = owner; 
            } 

            ///  
            /// 
            /// [To be supplied.]
            /// 
            public ToolStripPanelRowCollection(ToolStripPanel owner, ToolStripPanelRow[] value) { 
                this.owner = owner;
                AddRange(value); 
            } 

            ///  
            /// 
            /// 
            /// 
            public new virtual ToolStripPanelRow this[int index] { 
                get {
                    return (ToolStripPanelRow)(InnerList[index]); 
                } 
            }
 
            /// 
            /// 
            /// [To be supplied.]
            ///  
            public int Add(ToolStripPanelRow value) {
                if (value == null) { 
                    throw new ArgumentNullException("value"); 
                }
                int retVal = InnerList.Add(value); 
                OnAdd(value, retVal);
                return retVal;

            } 

 
            ///  
            /// 
            /// [To be supplied.] 
            /// 
            public void AddRange(ToolStripPanelRow[] value) {
                if (value == null) {
                    throw new ArgumentNullException("value"); 
                }
 
                ToolStripPanel currentOwner = this.owner; 
                if (currentOwner != null) {
                    currentOwner.SuspendLayout(); 
                }
                try {
                    for (int i = 0; i < value.Length; i++) {
                        this.Add(value[i]); 
                    }
                } 
                finally { 
                    if (currentOwner != null) {
                        currentOwner.ResumeLayout(); 
                    }
                }
            }
            ///  
            /// 
            /// [To be supplied.] 
            ///  
            public void AddRange(ToolStripPanelRowCollection value) {
                if (value == null) { 
                    throw new ArgumentNullException("value");
                }

                ToolStripPanel currentOwner = this.owner; 
                if (currentOwner != null) {
                    currentOwner.SuspendLayout(); 
                } 
                try {
                    int currentCount = value.Count; 
                    for (int i = 0; i < currentCount; i++) {
                        this.Add(value[i]);
                    }
                } 
                finally {
                    if (currentOwner != null) { 
                        currentOwner.ResumeLayout(); 
                    }
                } 

            }

            ///  
            /// 
            /// [To be supplied.] 
            ///  
            public bool Contains(ToolStripPanelRow value) {
                return InnerList.Contains(value); 
            }

            /// 
            ///  
            /// [To be supplied.]
            ///  
            public virtual void Clear() { 
                if (owner != null) {
                    owner.SuspendLayout(); 
                }
                try {
                    while (Count != 0) {
                        RemoveAt(Count - 1); 
                    }
                } 
                finally { 
                    if (owner != null) {
                        owner.ResumeLayout(); 
                    }
                }
            }
 
            void IList.Clear() { Clear(); }
            bool IList.IsFixedSize { get { return InnerList.IsFixedSize; } } 
            bool IList.Contains(object value) { return InnerList.Contains(value); } 
            bool IList.IsReadOnly { get { return InnerList.IsReadOnly; } }
            void IList.RemoveAt(int index) { RemoveAt(index); } 
            void IList.Remove(object value) { Remove(value as ToolStripPanelRow); }
            int IList.Add(object value) { return Add(value as ToolStripPanelRow); }
            int IList.IndexOf(object value) { return IndexOf(value as ToolStripPanelRow); }
            void IList.Insert(int index, object value) { Insert(index, value as ToolStripPanelRow); } 

            ///  
            ///  
            object IList.this[int index] {
                get { return InnerList[index]; } 
                set { throw new NotSupportedException(SR.GetString(SR.ToolStripCollectionMustInsertAndRemove)); /* InnerList[index] = value; */ }
            }

 
            /// 
            ///  
            /// [To be supplied.] 
            /// 
            public int IndexOf(ToolStripPanelRow value) { 
                return InnerList.IndexOf(value);
            }

            ///  
            public void Insert(int index, ToolStripPanelRow value) {
                if (value == null) { 
                    throw new ArgumentNullException("value"); 
                }
 
                InnerList.Insert(index, value);
                OnAdd(value, index);

            } 

            private void OnAdd(ToolStripPanelRow value, int index) { 
                if (owner != null) { 
                    LayoutTransaction.DoLayout(owner, value, PropertyNames.Parent);
                } 
            }

            /// 
            ///  Do proper cleanup of ownership, etc. 
            /// 
            private void OnAfterRemove(ToolStripPanelRow row) { 
 
#if DEBUG
                    if (ToolStripPanelMissingRowDebug.TraceVerbose) { 
                       if (row != null) {
                          Debug.Write("Removing row: ");
                          row.Debug_PrintRowID();
                          Debug.WriteLine(new StackTrace().ToString()); 
                       }
                    } 
#endif 

            } 

            /// 
            /// 
            /// [To be supplied.] 
            /// 
            public void Remove(ToolStripPanelRow value) { 
                InnerList.Remove(value); 
                OnAfterRemove(value);
            } 

            /// 
            /// 
            /// [To be supplied.] 
            /// 
            public void RemoveAt(int index) { 
                ToolStripPanelRow item = null; 
                if (index < Count && index >= 0) {
                    item = (ToolStripPanelRow)(InnerList[index]); 
                }
                InnerList.RemoveAt(index);
                OnAfterRemove(item);
            } 

 
 
            /// 
            ///  
            /// [To be supplied.]
            /// 
            public void CopyTo(ToolStripPanelRow[] array, int index) {
                InnerList.CopyTo(array, index); 
            }
 
 

        } 

        internal class ToolStripPanelControlCollection : WindowsFormsUtils.TypedControlCollection {

            private ToolStripPanel owner; 

            public ToolStripPanelControlCollection(ToolStripPanel owner) 
                : base(owner, typeof(ToolStrip)) { 
                this.owner = owner;
            } 

            internal override void AddInternal(Control value) {
                if (value != null) {
                    using (new LayoutTransaction(value, value, PropertyNames.Parent)) { 
                        base.AddInternal(value);
                    } 
                } 
                else {
                    base.AddInternal(value); 
                }

            }
 
            internal void Sort() {
                if (owner.Orientation == Orientation.Horizontal) { 
                    InnerList.Sort(new YXComparer()); 
                }
                else { 
                    InnerList.Sort(new XYComparer());
                }
            }
 

            // sort by X, then Y 
            public class XYComparer : IComparer { 
                public XYComparer() { }
                public int Compare(object first, object second) { 
                    Control one = first as Control;
                    Control two = second as Control;

                    if (one.Bounds.X < two.Bounds.X) { 
                        return -1;
                    } 
 
                    if (one.Bounds.X == two.Bounds.X) {
                        if (one.Bounds.Y < two.Bounds.Y) { 
                            return -1;
                        }
                        return 1;
                    } 
                    return 1;
 
                } 
            }
 
            // sort by Y, then X
            public class YXComparer : IComparer {
                public YXComparer() { }
                public int Compare(object first, object second) { 
                    Control one = first as Control;
                    Control two = second as Control; 
 
                    if (one.Bounds.Y < two.Bounds.Y) {
                        return -1; 
                    }

                    if (one.Bounds.Y == two.Bounds.Y) {
                        if (one.Bounds.X < two.Bounds.X) { 
                            return -1;
                        } 
                        return 1; 
                    }
                    return 1; 

                }
            }
 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//#define DEBUG_PAINT 
//------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
/* 
*/ 

namespace System.Windows.Forms { 
    using System.Drawing;
    using System.Windows.Forms.Layout;
    using System.Collections.Specialized;
    using System.Collections; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis; 
    using System.Runtime.InteropServices;
    using System.ComponentModel.Design.Serialization; 
    using System.Security.Permissions;
    using System.Security;
    using System.Globalization;
    using System.Windows.Forms.Internal; 

    ///  
    [ComVisible(true)] 
    [ClassInterface(ClassInterfaceType.AutoDispatch)]
    [Designer("System.Windows.Forms.Design.ToolStripPanelDesigner, " + AssemblyRef.SystemDesign)] 
    [ToolboxBitmapAttribute(typeof(ToolStripPanel), "ToolStripPanel_standalone.bmp")]
    public class ToolStripPanel : ContainerControl, IArrangedElement {

 
        private Orientation orientation = Orientation.Horizontal;
        private Padding rowMargin = new Padding(3,0,0,0); 
        private ToolStripRendererSwitcher rendererSwitcher = null; 
        private Type currentRendererType = typeof(System.Type);
        private BitVector32 state = new BitVector32(); 
        private ToolStripContainer owner;


#if DEBUG 
            internal static TraceSwitch ToolStripPanelDebug = new TraceSwitch("ToolStripPanelDebug", "Debug code for rafting mouse movement");
            internal static TraceSwitch ToolStripPanelFeedbackDebug = new TraceSwitch("ToolStripPanelFeedbackDebug", "Debug code for rafting feedback"); 
            internal static TraceSwitch ToolStripPanelMissingRowDebug = new TraceSwitch("ToolStripPanelMissingRowDebug", "Debug code for rafting feedback"); 

#else 
        internal static TraceSwitch ToolStripPanelDebug;
        internal static TraceSwitch ToolStripPanelFeedbackDebug;
        internal static TraceSwitch ToolStripPanelMissingRowDebug;
#endif 

        [ThreadStatic] 
        private static Rectangle lastFeedbackRect = Rectangle.Empty; 

 
        // properties
        private static readonly int PropToolStripPanelRowCollection = PropertyStore.CreateKey();

        // states 
        private static readonly int stateLocked = BitVector32.CreateMask();
        private static readonly int stateBeginInit = BitVector32.CreateMask(stateLocked); 
        private static readonly int stateChangingZOrder = BitVector32.CreateMask(stateBeginInit); 
        private static readonly int stateInJoin = BitVector32.CreateMask(stateChangingZOrder);
        private static readonly int stateEndInit = BitVector32.CreateMask(stateInJoin); 
        private static readonly int stateLayoutSuspended  = BitVector32.CreateMask(stateEndInit);
        private static readonly int stateRightToLeftChanged =  BitVector32.CreateMask(stateLayoutSuspended);

 

        // events 
        internal static readonly Padding DragMargin = new Padding(10); 

        private static readonly object EventRendererChanged = new object(); 

        /// 
        public ToolStripPanel() {
            SuspendLayout(); 
            AutoScaleMode = AutoScaleMode.None;
            InitFlowLayout(); 
            this.AutoSize = true; 
            this.MinimumSize = Size.Empty; // consider 1,1
            this.state[stateLocked | stateBeginInit | stateChangingZOrder] = false; 
            this.TabStop = false;

            ToolStripManager.ToolStripPanels.Add(this);
            // not setting ControlStyles.AllPaintingInWmPaint as we dont do any painting in OnPaint... all 
            // is done in OnPaintBackground... so its better to show the rafting container in WM_ERASEBACKGROUND.
            SetStyle(ControlStyles.ResizeRedraw | ControlStyles.OptimizedDoubleBuffer | /*ControlStyles.AllPaintingInWmPaint |*/ControlStyles.SupportsTransparentBackColor, true); 
            SetStyle(ControlStyles.Selectable, false); 
            ResumeLayout(true);
        } 

        internal ToolStripPanel(ToolStripContainer owner)
            : this() {
            this.owner = owner; 
        }
 
        [ 
        Browsable(false),
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 

        ]
        public override bool AllowDrop {
            get { return base.AllowDrop; } 
            set { base.AllowDrop = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public override bool AutoScroll {
            get { return base.AutoScroll; } 
            set { base.AutoScroll = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public new Size AutoScrollMargin {
            get { return base.AutoScrollMargin; } 
            set { base.AutoScrollMargin = value; }
        } 
 
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        ]
        public new Size AutoScrollMinSize {
            get { return base.AutoScrollMinSize; } 
            set { base.AutoScrollMinSize = value; }
        } 
 

        ///  
        [
            DefaultValue(true),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)
        ] 
        public override bool AutoSize {
            get { 
                return base.AutoSize; 
            }
            set { 
                base.AutoSize = value;
            }

        } 

 
        ///  
        /// Override base AutoSizeChanged to we can change visibility/browsability attributes
        [ 
        Browsable(true),
        EditorBrowsable(EditorBrowsableState.Always)
        ]
        public new event EventHandler AutoSizeChanged { 
            add {
                base.AutoSizeChanged += value; 
            } 
            remove {
                base.AutoSizeChanged -= value; 
            }
        }

        ///  
        protected override Padding DefaultPadding {
            get { return Padding.Empty; } 
        } 
        protected override Padding DefaultMargin {
            get { return Padding.Empty; } 
        }

        public Padding RowMargin {
            get { return rowMargin; } 
            set {
                rowMargin = value; 
                LayoutTransaction.DoLayout(this, this, "RowMargin"); 
            }
        } 

        /// 
        public override DockStyle Dock {
            get { 
                return base.Dock;
            } 
            set { 
                base.Dock = value;
 
                if (value == DockStyle.Left || value == DockStyle.Right) {
                    Orientation = Orientation.Vertical;
                }
                else { 
                    Orientation = Orientation.Horizontal;
                } 
            } 
        }
 
        internal Rectangle DragBounds {
            get {
                return LayoutUtils.InflateRect(this.ClientRectangle, DragMargin);
            } 
        }
 
        internal bool IsInDesignMode { 
            get {
                return DesignMode; 
            }

        }
 
        /// 
        public override LayoutEngine LayoutEngine { 
            get { 
                return FlowLayout.Instance;
            } 
        }

        /// 
        [ 
        DefaultValue(false),
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Advanced) 
        ]
        public bool Locked { 
            get {
                return state[stateLocked];
            }
            set { 
                state[stateLocked] = value;
            } 
        } 

 
        /// 
        public Orientation Orientation {
            get {
                return orientation; 
            }
            set { 
                if (orientation != value) { 
                    orientation = value;
                    rowMargin= LayoutUtils.FlipPadding(rowMargin); 
                    InitFlowLayout();
                    foreach (ToolStripPanelRow row in this.RowsInternal) {
                        row.OnOrientationChanged();
                    } 
                }
            } 
        } 

        private ToolStripRendererSwitcher RendererSwitcher { 
            get {
                if (rendererSwitcher == null) {
                    rendererSwitcher = new ToolStripRendererSwitcher(this);
                    HandleRendererChanged(this, EventArgs.Empty); 
                    rendererSwitcher.RendererChanged += new EventHandler(HandleRendererChanged);
                } 
                return rendererSwitcher; 
            }
        } 

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        // PM team has reviewed and decided on naming changes already 
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
        public ToolStripRenderer Renderer { 
            get { 
                return RendererSwitcher.Renderer;
            } 
            set {
                RendererSwitcher.Renderer = value;
            }
        } 

 
        ///  
        [
        SRDescription(SR.ToolStripRenderModeDescr), 
        SRCategory(SR.CatAppearance),
        ]
        public ToolStripRenderMode RenderMode {
            get { 
                return RendererSwitcher.RenderMode;
            } 
            set { 
                RendererSwitcher.RenderMode = value;
            } 
        }

        [SRCategory(SR.CatAppearance), SRDescription(SR.ToolStripRendererChanged)]
        // PM team has reviewed and decided on naming changes already 
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
        public event EventHandler RendererChanged { 
            add { 
                Events.AddHandler(EventRendererChanged, value);
            } 
            remove {
                Events.RemoveHandler(EventRendererChanged, value);
            }
        } 

        ///  
        ///  
        /// Collection of child controls.
        ///  
        [
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        SRDescription(SR.ToolStripPanelRowsDescr) 
        ]
        internal ToolStripPanelRowCollection RowsInternal { 
            get { 
                ToolStripPanelRowCollection rowCollection = (ToolStripPanelRowCollection)Properties.GetObject(PropToolStripPanelRowCollection);
 
                if (rowCollection == null) {
                    rowCollection = CreateToolStripPanelRowCollection();
                    Properties.SetObject(PropToolStripPanelRowCollection, rowCollection);
                } 
                return rowCollection;
            } 
        } 

        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        SRDescription(SR.ToolStripPanelRowsDescr),
        SuppressMessage("Microsoft.Performance", "CA1819:PropertiesShouldNotReturnArrays") 
        ]
 
        public ToolStripPanelRow[] Rows { 
            get {
                ToolStripPanelRow[] rows = new ToolStripPanelRow[RowsInternal.Count]; 
                RowsInternal.CopyTo(rows,0);
                return rows;
            }
        } 

 
        ///  
        [
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public new int TabIndex { 
            get {
                return base.TabIndex; 
            } 
            set {
                base.TabIndex = value; 
            }
        }

        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event EventHandler TabIndexChanged { 
            add { 
                base.TabIndexChanged += value;
            } 
            remove {
                base.TabIndexChanged -= value;
            }
        } 

        ///  
        [ 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public new bool TabStop {
            get { 
                return base.TabStop;
            } 
            set { 
                base.TabStop = value;
            } 
        }

        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] 
        public new event EventHandler TabStopChanged {
            add { 
                base.TabStopChanged += value; 
            }
            remove { 
                base.TabStopChanged -= value;
            }
        }
 
        /// 
        [ 
        Browsable(false), 
        EditorBrowsable(EditorBrowsableState.Never),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public override string Text {
            get {
                return base.Text; 
            }
            set { 
                base.Text = value; 
            }
        } 

        /// 
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new event EventHandler TextChanged { 
            add {
                base.TextChanged += value; 
            } 
            remove {
                base.TextChanged -= value; 
            }
        }

 
        #region ISupportInitialize
 
        public void BeginInit() { 
            state[stateBeginInit] = true;
        } 


        public void EndInit() {
            state[stateBeginInit] = false; 
            state[stateEndInit] = true;
            try { 
                if (!state[stateInJoin]) { 
                    JoinControls();
                } 
            }
            finally {
                state[stateEndInit] = false;
            } 

        } 
 
        #endregion ISupportInitialize
 

        /// 
        private ToolStripPanelRowCollection CreateToolStripPanelRowCollection() {
            return new ToolStripPanelRowCollection(this); 
        }
 
        protected override Control.ControlCollection CreateControlsInstance() { 
            return new ToolStripPanelControlCollection(this);
        } 



        ///  
        /// 
        ///    Disposes of the resources (other than memory) used by 
        ///       the  
        ///       .
        ///  
        protected override void Dispose(bool disposing) {
            if (disposing) {
                ToolStripManager.ToolStripPanels.Remove(this);
            } 
            base.Dispose(disposing);
        } 
 
        private void InitFlowLayout() {
            if (Orientation == Orientation.Horizontal) { 
                FlowLayout.SetFlowDirection(this, FlowDirection.TopDown);
            }
            else {
                FlowLayout.SetFlowDirection(this, FlowDirection.LeftToRight); 
            }
            FlowLayout.SetWrapContents(this, false); 
 
        }
        private Point GetStartLocation(ToolStrip toolStripToDrag) { 
            if (toolStripToDrag.IsCurrentlyDragging
                && Orientation == Orientation.Horizontal
                && toolStripToDrag.RightToLeft == RightToLeft.Yes ) {
                // the grip is on the right side, not left. 
                return new Point(toolStripToDrag.Right,toolStripToDrag.Top);
            } 
            return toolStripToDrag.Location; 
        }
 
        private void HandleRendererChanged(object sender, EventArgs e) {
            OnRendererChanged(e);
        }
 

 
 
#if DEBUG_PAINT
                ///  
                protected  override void OnPaint(PaintEventArgs e) {
                    base.OnPaint(e);
                    Graphics g = e.Graphics;
                    foreach (ToolStripPanelRow row in this.RowsInternal) { 
                        g.DrawRectangle(SystemPens.Highlight, row.Bounds);
                        row.PaintColumns(e); 
                    } 
                }
#endif 

        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected override void OnPaintBackground(PaintEventArgs e) {
            ToolStripPanelRenderEventArgs rea =  new ToolStripPanelRenderEventArgs(e.Graphics, this); 
            Renderer.DrawToolStripPanelBackground(rea);
 
            if (!rea.Handled) { 
                base.OnPaintBackground(e);
            } 
        }

        protected override void OnControlAdded(ControlEventArgs e) {
            base.OnControlAdded(e); 

            if (!state[stateBeginInit] && !state[stateInJoin]) { 
                if (!state[stateLayoutSuspended]) { 
                    this.Join(e.Control as ToolStrip, e.Control.Location);
                } 
                else {
                    BeginInit();
                }
            } 

        } 
 
        protected override void OnControlRemoved(ControlEventArgs e) {
            ISupportToolStripPanel controlToBeDragged = e.Control as ISupportToolStripPanel; 

            if (controlToBeDragged != null) {
                if (controlToBeDragged.ToolStripPanelRow != null/* && controlToBeDragged.ToolStripPanelRow != owner*/) {
                    controlToBeDragged.ToolStripPanelRow.ControlsInternal.Remove(e.Control); 
                }
            } 
            base.OnControlRemoved(e); 
        }
 
        /// 
        protected override void OnLayout(LayoutEventArgs e) {
            if (e.AffectedComponent != ParentInternal && e.AffectedComponent as Control != null) {
                ISupportToolStripPanel draggedControl = e.AffectedComponent as ISupportToolStripPanel; 
                if (draggedControl != null && this.RowsInternal.Contains(draggedControl.ToolStripPanelRow)) {
                    // there's a problem in the base onlayout... if toolstrip needs more space it talks to us 
                    // not the row that needs layout. 
                    LayoutTransaction.DoLayout(draggedControl.ToolStripPanelRow, e.AffectedComponent as IArrangedElement, e.AffectedProperty);
                } 
            }
            base.OnLayout(e);
        }
 
        internal override void OnLayoutSuspended() {
            base.OnLayoutSuspended(); 
            state[stateLayoutSuspended] = true; 

        } 

        internal override void OnLayoutResuming(bool resumeLayout) {
            base.OnLayoutResuming(resumeLayout);
            state[stateLayoutSuspended] = false; 
            if (state[stateBeginInit]) {
                EndInit(); 
            } 
        }
 
        protected override void OnRightToLeftChanged(EventArgs e) {
            base.OnRightToLeftChanged(e);

            if (!state[stateBeginInit]) { 
                if (Controls.Count > 0) {
                    // rejoin the controls on the other side of the toolstrippanel. 
                    SuspendLayout(); 
                    Control[] controls = new Control[this.Controls.Count];
                    Point[] controlLocations = new Point[this.Controls.Count]; 
                    int j = 0;
                    foreach (ToolStripPanelRow row in this.RowsInternal) {
                        foreach (Control control in row.ControlsInternal) {
                            controls[j] = control; 
                            controlLocations[j] = new Point(row.Bounds.Width - control.Right, control.Top);
                            j++; 
                        } 
                    }
 
                    this.Controls.Clear();

                    for ( int i = 0; i < controls.Length; i++) {
                        Join(controls[i] as ToolStrip, controlLocations[i]); 
                    }
 
                    ResumeLayout(true); 
                }
            } 
            else {
                state[stateRightToLeftChanged] = true;
            }
 
        }
 
        ///  
        // PM team has reviewed and decided on naming changes already
        [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")] 
        protected virtual void OnRendererChanged(EventArgs e) {
            Renderer.InitializePanel(this);

            this.Invalidate(); 

            EventHandler handler = (EventHandler)Events[EventRendererChanged]; 
            if (handler != null) handler(this, e); 

        } 

        /// 
        /// 
        /// We want to Set ToolStripPanel at DesignTime when the ToolStripPanel is added to the Form, 
        /// 
        protected override void OnParentChanged(EventArgs e) { 
            PerformUpdate(); 
            base.OnParentChanged(e);
        } 

        protected override void OnDockChanged(EventArgs e) {
            PerformUpdate();
            base.OnDockChanged(e); 
        }
 
 
        internal void PerformUpdate() {
            PerformUpdate(false); 
        }
        internal void PerformUpdate(bool forceLayout) {

            if (!state[stateBeginInit] && !state[stateInJoin]) { 
                JoinControls(forceLayout);
            } 
 
        }
        private void ResetRenderMode() { 
           RendererSwitcher.ResetRenderMode();
        }

        private bool ShouldSerializeRenderMode() { 
            return RendererSwitcher.ShouldSerializeRenderMode();
        } 
 
        private bool ShouldSerializeDock() {
            return (owner == null && (Dock != DockStyle.None)); 
        }

        private void JoinControls() {
            JoinControls(false); 
        }
        private void JoinControls(bool forceLayout) { 
            // undone: config - shift to other container 
            ToolStripPanelControlCollection controls = this.Controls as ToolStripPanelControlCollection;
            if (controls.Count > 0) { 
                controls.Sort();

                // since Join is going to mess with our order - make a copy. (ugh).
                Control[] controlArray = new Control[controls.Count]; 
                controls.CopyTo(controlArray, 0);
                for (int i = 0; i < controlArray.Length; i++) { 
                    int numRows = RowsInternal.Count; 
                    ISupportToolStripPanel draggedControl = controlArray[i] as ISupportToolStripPanel;
 
                    if (draggedControl != null && draggedControl.ToolStripPanelRow != null && !draggedControl.IsCurrentlyDragging) {
                        ToolStripPanelRow row = draggedControl.ToolStripPanelRow;
                        if (row.Bounds.Contains(controlArray[i].Location)) {
                            // this toolstrip does not require join. 
                            continue;
                        } 
                    } 
                    if (controlArray[i].AutoSize) {
                        controlArray[i].Size = controlArray[i].PreferredSize; 
                    }
                    Point controlLocation = controlArray[i].Location;

                    // right to left has changed while layout was deferred... 
                    if (state[stateRightToLeftChanged]) {
                        controlLocation = new Point(this.Width - controlArray[i].Right, controlLocation.Y); 
                    } 
                    this.Join(controlArray[i] as ToolStrip, controlArray[i].Location);
                    if (numRows < RowsInternal.Count || forceLayout) { 
                        // OK this is wierd but here we're in the midst of a suspend layout.
                        // the only way we can deterministically place these guys is to force a layout
                        // each time we've added a new row.  Otherwise we wont find the correct
                        // row to add the control to (PointToRow will fail as Row.Bounds isnt set yet) 
                        OnLayout(new LayoutEventArgs(this, PropertyNames.Rows));
                    } 
                } 
            }
            state[stateRightToLeftChanged] = false; 

        }

        #region Feedback 

        [ThreadStatic] 
        private static FeedbackRectangle feedbackRect; 

        private void GiveToolStripPanelFeedback(ToolStrip toolStripToDrag, Point screenLocation) { 

            if (Orientation == Orientation.Horizontal && RightToLeft == RightToLeft.Yes) {
                // paint the feedback in the correct location when RTL.Yes
                screenLocation.Offset(-toolStripToDrag.Width,0); 
            }
            if (CurrentFeedbackRect == null) { 
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: creating NEW feedback at " + screenLocation.ToString()); 

                CurrentFeedbackRect = new FeedbackRectangle(toolStripToDrag.ClientRectangle); 
            }

            if (!CurrentFeedbackRect.Visible) {
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: Showing NEW feedback at " + screenLocation.ToString()); 
                toolStripToDrag.SuspendCaputureMode();
                try { 
                    CurrentFeedbackRect.Show(screenLocation); 
                    toolStripToDrag.CaptureInternal = true;
                } 
                finally {
                    toolStripToDrag.ResumeCaputureMode();
                }
            } 
            else {
                Debug.WriteLineIf(ToolStripPanelFeedbackDebug.TraceVerbose, "FEEDBACK: Moving feedback to " + screenLocation.ToString()); 
                CurrentFeedbackRect.Move(screenLocation); 

            } 
        }


 
        internal static void ClearDragFeedback() {
#if DEBUG 
            if (ToolStripPanelFeedbackDebug.TraceVerbose){ 
               Debug.WriteLine("FEEDBACK:  clearing old feedback at "/*+ new StackTrace().ToString()*/);
            } 
#endif
            FeedbackRectangle oldFeedback = feedbackRect;
            feedbackRect = null;
            if (oldFeedback != null) { 
                oldFeedback.Dispose();
            } 
 
        }
 

        private static FeedbackRectangle CurrentFeedbackRect {
            get {
                return feedbackRect; 
            }
            set { 
                feedbackRect = value; 
            }
        } 


        // The FeedbackRectangle happens to encapsulate a toolstripdropdown
        // with a special region. The feedback rectangle exposes the minimum 
        // API so the underlying implementation can be replaced if necessary.
        private class FeedbackRectangle : IDisposable { 
            private FeedbackDropDown dropDown; 

            public FeedbackRectangle(Rectangle bounds) { 
                dropDown = new FeedbackDropDown(bounds);

            }
            public bool Visible { 
                get {
                    if (dropDown != null && !dropDown.IsDisposed) { 
                        return dropDown.Visible; 
                    }
                    return false; 
                }
                set {
                    if (dropDown != null && !dropDown.IsDisposed) {
                        dropDown.Visible = value; 
                    }
                } 
            } 

            public void Show(Point newLocation) { 
                dropDown.Show(newLocation);
            }
            public void Move(Point newLocation) {
               dropDown.MoveTo(newLocation); 
            }
 
            protected void Dispose(bool disposing) { 
                if (disposing) {
                   if (dropDown != null) { 
                        Visible = false;
                        dropDown.Dispose();
                        dropDown = null;
                   } 
                }
            } 
 
            public void Dispose() {
                Dispose(true); 
            }

            ~FeedbackRectangle() {
                Dispose(false); 
            }
 
            private class FeedbackDropDown : ToolStripDropDown { 

                private const int MAX_PAINTS_TO_SERVICE = 20; 
                private int _numPaintsServiced = 0; // member variable to protect against re-entrancy

                public FeedbackDropDown(Rectangle bounds) : base(){
                    SetStyle(ControlStyles.AllPaintingInWmPaint, false); 
                    SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
                    SetStyle(ControlStyles.CacheText, true); 
                    this.AutoClose = false; 
                    this.AutoSize = false;
                    this.DropShadowEnabled = false; 
                    this.Bounds = bounds;

                    // caching as this is unlikely to change during the lifetime
                    // of the dropdown. 

                    Rectangle regionRect = bounds;    //create a region the size of the client area 
                    regionRect.Inflate(-1,-1);        //squish down by one pixel 

                    Region rgn = new Region(bounds);  // create region 
                    rgn.Exclude(regionRect);          // exclude the center part

                    // set it into the toolstripdropdown’s region
                    IntSecurity.ChangeWindowRegionForTopLevel.Assert(); 
                    this.Region = rgn;
                    // RevertAssert automatically called here when exiting function. 
 
                }
 
                // ForceSynchronousPaint - peeks through the message queue, looking for WM_PAINTs
                // calls UpdateWindow on the hwnd to force the paint to happen now.
                //
                // When we're changing the location of the feedback dropdown, we need to 
                // force WM_PAINTS to happen, as things that dont respond to WM_ERASEBKGND
                // have bits of the dropdown region drawn all over them. 
                private void ForceSynchronousPaint() { 
                    if (!IsDisposed) {
                        if (_numPaintsServiced == 0) { // protect against re-entrancy. 
                            try {
                                NativeMethods.MSG msg = new NativeMethods.MSG();
                                while (UnsafeNativeMethods.PeekMessage(ref msg, new HandleRef(this, IntPtr.Zero),
                                                           NativeMethods.WM_PAINT, NativeMethods.WM_PAINT, 
                                                           NativeMethods.PM_REMOVE)) {
                                    SafeNativeMethods.UpdateWindow(new HandleRef(null, msg.hwnd)); 
 
                                    // Infinite loop protection
                                    if (_numPaintsServiced++ > MAX_PAINTS_TO_SERVICE) { 
                                        Debug.Fail("somehow we've gotten ourself in a situation where we're pumping an unreasonable number of paint messages, investigate.");
                                        break;
                                    }
                                } 
                            }
                            finally { 
                                _numPaintsServiced = 0; 
                            }
                        } 
                    }
                }

                protected override void OnPaint(PaintEventArgs e) { 
                }
                protected override void OnPaintBackground(PaintEventArgs e) { 
                    // respond to everything in WM_ERASEBKGND 
                    Renderer.DrawToolStripBackground(new ToolStripRenderEventArgs(e.Graphics, this));
                    Renderer.DrawToolStripBorder(new ToolStripRenderEventArgs(e.Graphics, this)); 
                }
                protected override void OnOpening(CancelEventArgs e) {
                    base.OnOpening(e);
                    e.Cancel = false; 
                }
 
                public void MoveTo(Point newLocation) { 
                    this.Location = newLocation;
                    // if we dont force a paint here, we'll only send WM_ERASEBKGNDs right away 
                    // and leave rectangles all over controls that dont respond to that window message.
                    ForceSynchronousPaint();
                }
 
                [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
                protected override void WndProc(ref Message m){ 
                    if (m.Msg == NativeMethods.WM_NCHITTEST){ 
                        m.Result = (IntPtr)NativeMethods.HTTRANSPARENT;
                    } 
                    base.WndProc(ref m);
                }
            }
        } 

        #endregion Feedback 
 
        #region JoinAndMove
 
        public void Join(ToolStrip toolStripToDrag) {
            Join(toolStripToDrag, Point.Empty);
        }
 
        public void Join(ToolStrip toolStripToDrag, int row) {
            if (row < 0) { 
                throw new ArgumentOutOfRangeException("row", SR.GetString(SR.IndexOutOfRange, row.ToString(CultureInfo.CurrentCulture))); 
            }
 
            Point location = Point.Empty;
            Rectangle dragRect = Rectangle.Empty;
            if (row >= RowsInternal.Count) {
                dragRect = DragBounds; 
            }
            else { 
                dragRect = this.RowsInternal[row].DragBounds; 
            }
 
            if (Orientation == Orientation.Horizontal) {
                location = new Point(0, dragRect.Bottom -1);
            }
            else { 
                location = new Point(dragRect.Right -1, 0);
            } 
 
            Join(toolStripToDrag, location);
 
        }

        public void Join(ToolStrip toolStripToDrag, int x, int y) {
            Join(toolStripToDrag, new Point(x, y)); 
        }
 
        [ 
            SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using ToolStrip instead of Control intentionally
        ] 
        public void Join(ToolStrip toolStripToDrag, Point location) {
            if (toolStripToDrag == null) {
                throw new ArgumentNullException("toolStripToDrag");
            } 
            if (!state[stateBeginInit] && !state[stateInJoin]) {
                try { 
                    state[stateInJoin] = true; 
                    toolStripToDrag.ParentInternal = this;
                    MoveInsideContainer(toolStripToDrag, location); 
                }
                finally {
                    state[stateInJoin] = false;
                } 
            }
            else { 
                this.Controls.Add(toolStripToDrag); 
                toolStripToDrag.Location = location;
            } 
        }

        internal void MoveControl(ToolStrip toolStripToDrag, Point screenLocation) {
            ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel; 

            if (draggedControl == null) { 
                Debug.Fail("Move called on immovable object."); 
                return;
            } 

            Point clientLocation = PointToClient(screenLocation);
            if (!this.DragBounds.Contains(clientLocation)) {
                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "RC.MoveControl - Point {0} is not in current rafting container drag bounds {1}, calling MoveOutsideContainer", clientLocation, DragBounds)); 
                MoveOutsideContainer(toolStripToDrag, screenLocation);
                return; 
            } 
            else {
                Join(toolStripToDrag as ToolStrip, clientLocation); 
            }
        }

        private void MoveInsideContainer(ToolStrip toolStripToDrag, Point clientLocation) { 
            ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel;
            // if the point is not in this rafting container forward on to the appropriate container. 
 
            if (draggedControl.IsCurrentlyDragging && !this.DragBounds.Contains(clientLocation)) {
                return; 
            }

            // we know we're moving inside the container.
 
            bool changedRow = false;
 
            ClearDragFeedback(); 

            // VSWhidbey 439542 - in design mode we get bogus values for client location. 
            if (toolStripToDrag.Site != null && toolStripToDrag.Site.DesignMode && IsHandleCreated) {

                if (clientLocation.X < 0 || clientLocation.Y < 0) {
                    Point currentCursorLoc = PointToClient(WindowsFormsUtils.LastCursorPoint); 
                    if (ClientRectangle.Contains(currentCursorLoc)) {
                        clientLocation = currentCursorLoc; 
                    } 
                }
            } 


            //
            // Point INSIDE this rafting container 
            //
 
            ToolStripPanelRow currentToolStripPanelRow = draggedControl.ToolStripPanelRow; 

#if DEBUG 
            bool debugModeOnly_ChangedContainers = currentToolStripPanelRow != null ?
                                (currentToolStripPanelRow.ToolStripPanel != this) : true;
#endif
 
            if (currentToolStripPanelRow != null && currentToolStripPanelRow.Visible && currentToolStripPanelRow.ToolStripPanel == this && currentToolStripPanelRow.DragBounds.Contains(clientLocation)) {
                // Point INSIDE same rafting row 
                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, "RC.MoveControl - Point  " + clientLocation + "is in the same row as the control" + draggedControl.ToolStripPanelRow.DragBounds); 
                draggedControl.ToolStripPanelRow.MoveControl(toolStripToDrag, GetStartLocation(toolStripToDrag), clientLocation);
            } 
            else {
                // Point OUTSIDE current rafting row.

 

                Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, "RC.MoveControl - Point " + clientLocation + " is outside the current rafting row."); 
 
                ToolStripPanelRow row = PointToRow(clientLocation);
                if (row == null) { 
                    Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tThere is no row corresponding to this point, creating a new one."));

                    // there's no row at this point so lets create one
                    int index = this.RowsInternal.Count; 

                    if (Orientation == Orientation.Horizontal) { 
                        // if it's above the first row, insert at the front. 
                        index = (clientLocation.Y <= this.Padding.Left) ? 0 : index;
                    } 
                    else { // Orientation.Vertical
                        // if it's before the first row, insert at the front.
                        index = (clientLocation.X <= this.Padding.Left) ? 0 : index;
                    } 

                    ToolStripPanelRow previousRow = null; 
                    if (this.RowsInternal.Count > 0) { 
                        if (index == 0) {
                            previousRow = this.RowsInternal[0]; 
                        }
                        else if (index > 0) {
                            previousRow = this.RowsInternal[index - 1];
                        } 
                    }
                    if (previousRow != null /* there was a previous row */ 
                        && previousRow.ControlsInternal.Count == 1 /*toolStripToDrag*/ 
                        && previousRow.ControlsInternal.Contains(toolStripToDrag)) {
                        // if the previous row already contains this control 
                        // it's futile to create a new row, we're just going to wind
                        // up disposing this one and causing great amounts of flicker.
                        row = previousRow;
 
                        Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, "Reusing previous row");
                        // Move the ToolStrip to the new Location in the existing row. 
                        if (toolStripToDrag.IsInDesignMode)  { 
                            Point endLocation = (Orientation == Orientation.Horizontal) ? new Point (clientLocation.X, row.Bounds.Y) :  new Point (row.Bounds.X, clientLocation.Y);
                            draggedControl.ToolStripPanelRow.MoveControl(toolStripToDrag, GetStartLocation(toolStripToDrag), endLocation); 
                        }
                    }
                    else {
                        // Create a new row and insert it. 
                        //
                        Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, "Inserting a new row at " + index.ToString(CultureInfo.InvariantCulture)); 
                        row = new ToolStripPanelRow(this); 
                        this.RowsInternal.Insert(index, row);
 
                    }
                }
                else if (!row.CanMove(toolStripToDrag)) {
                    Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tThere was a row, but we cant add the control to it, creating/inserting new row.")); 

                    // we have a row at that point, but its too full or doesnt want 
                    // anyone to join it. 
                    int index = RowsInternal.IndexOf(row);
 
                    if (currentToolStripPanelRow != null && currentToolStripPanelRow.ControlsInternal.Count == 1) {
                        if (index > 0 && index-1 == RowsInternal.IndexOf(currentToolStripPanelRow)) {
                            Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelRowCreationDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tAttempts to leave the current row failed as there's no space in the next row.  Since there's only one control, just keep the row."));
                            return; 
                        }
                    } 
                    row = new ToolStripPanelRow(this); 
                    this.RowsInternal.Insert(index, row);
                    clientLocation.Y = row.Bounds.Y; 
                }

                changedRow = (currentToolStripPanelRow != row);
                if (!changedRow) { 
                    if (currentToolStripPanelRow != null && currentToolStripPanelRow.ControlsInternal.Count >1) {
                        // force a leave/re-enter to occur. 
                        currentToolStripPanelRow.LeaveRow(toolStripToDrag); 
                        currentToolStripPanelRow = null;
                        changedRow = true; 
                    }
                }
                if (changedRow) {
                    Debug.WriteLineIf(ToolStripPanelDebug.TraceVerbose, String.Format(CultureInfo.CurrentCulture, "\tCalling JoinRow.")); 
                    if (currentToolStripPanelRow != null) {
                        currentToolStripPanelRow.LeaveRow(toolStripToDrag); 
                    } 
                    row.JoinRow(toolStripToDrag, clientLocation);
                } 

                if (changedRow && draggedControl.IsCurrentlyDragging) {
                    // force the layout of the new row.
                    for (int i = 0; i < RowsInternal.Count; i++) { 
                        LayoutTransaction.DoLayout(RowsInternal[i], this, PropertyNames.Rows);
                    } 
 

                    if (RowsInternal.IndexOf(row) > 0) { 
                        // VSWhidbey 327225 - when joining a new row, move the cursor to to the location of
                        // the grip, otherwise budging the mouse can pull it down into the next row.
                        IntSecurity.AdjustCursorPosition.Assert();
                        try { 
                            Point cursorLoc = toolStripToDrag.PointToScreen(toolStripToDrag.GripRectangle.Location);
                            if (Orientation == Orientation.Vertical) { 
                                cursorLoc.X += toolStripToDrag.GripRectangle.Width /2; 
                                cursorLoc.Y = Cursor.Position.Y;
                            } 
                            else {
                                cursorLoc.Y += toolStripToDrag.GripRectangle.Height /2;
                                cursorLoc.X = Cursor.Position.X;
                            } 
                            Cursor.Position = cursorLoc;
                        } 
                        finally { 
                            CodeAccessPermission.RevertAssert();
                        } 
                    }
                }

            } 

 
#if DEBUG 
            Debug_VerifyOneToOneCellRowControlMatchup();
//            Debug_VerifyCountRows(); 
            if (draggedControl.IsCurrentlyDragging && changedRow && !debugModeOnly_ChangedContainers) {
                // if we have changed containers, we're in a SuspendLayout.
                Debug_VerifyNoOverlaps();
            } 
#endif
        } 
 
        private void MoveOutsideContainer(ToolStrip toolStripToDrag, Point screenLocation) {
 
            // look for another rafting container.
            ToolStripPanel panel = ToolStripManager.ToolStripPanelFromPoint(toolStripToDrag, screenLocation);
            if (panel != null) {
                using (new LayoutTransaction(panel, panel, null)) { 
                    panel.MoveControl(toolStripToDrag, screenLocation);
                } 
                toolStripToDrag.PerformLayout(); 
#if DEBUG
                ISupportToolStripPanel draggedControl = toolStripToDrag as ISupportToolStripPanel; 
                if (draggedControl.IsCurrentlyDragging) {
                    Debug_VerifyNoOverlaps();
                }
#endif 
            }
            else { 
                GiveToolStripPanelFeedback(toolStripToDrag, screenLocation); 
            }
 
        }

        /// 
        ///  
        /// Given a point within the ToolStripPanel client area -
        /// it returns the row.  If no such row exists, returns null 
        ///  
        public ToolStripPanelRow PointToRow(Point clientLocation) {
            // PERF: since we're using the PropertyStore for this.RowsInternal, its actually 
            // faster to use foreach.
            foreach (ToolStripPanelRow row in this.RowsInternal) {
                Rectangle bounds = LayoutUtils.InflateRect(row.Bounds, row.Margin);
 
                // at this point we may not be sized correctly.  Guess.
                if (ParentInternal != null) { 
                    if (Orientation == Orientation.Horizontal && (bounds.Width == 0)) { 
                        bounds.Width = ParentInternal.DisplayRectangle.Width;
                    } 
                    else if (Orientation == Orientation.Vertical && (bounds.Height == 0)) {
                        bounds.Height = ParentInternal.DisplayRectangle.Height;
                    }
                } 

 
                if (bounds.Contains(clientLocation)) { 
                    return row;
                } 
            }
            return null;
        }
 

        #endregion JoinAndMove 
 

        [Conditional("DEBUG")] 
        private void Debug_VerifyOneToOneCellRowControlMatchup() {
            for (int i = 0; i < this.RowsInternal.Count; i++) {
                ToolStripPanelRow row = this.RowsInternal[i];
                foreach (ToolStripPanelCell cell in row.Cells) { 

                    if (cell.Control != null) { 
                        ToolStripPanelRow currentlyAssignedRow = ((ISupportToolStripPanel)cell.Control).ToolStripPanelRow; 
                        if (currentlyAssignedRow != row) {
                            int goodRowIndex = (currentlyAssignedRow != null) ? RowsInternal.IndexOf(currentlyAssignedRow) : -1; 
                            if (goodRowIndex == -1) {
                                Debug.Fail(String.Format(CultureInfo.CurrentCulture, "ToolStripPanelRow has not been assigned!  Should be set to {0}.", i));
                            }
                            else { 
                                Debug.Fail(String.Format(CultureInfo.CurrentCulture, "Detected orphan cell! {0} is in row {1}. It shouldnt have a cell in {2}! \r\n\r\nTurn on DEBUG_PAINT in ToolStripPanel and ToolStripPanelRow to investigate.", cell.Control.Name, goodRowIndex, i));
                            } 
                        } 
                    }
                    else { 
                        Debug.Fail("why do we have a cell with a null control in this row?");
                    }
                }
            } 
        }
 
        [Conditional("DEBUG")] 
        private void Debug_PrintRows() {
           for (int i = 0; i < RowsInternal.Count; i++) { 
                Debug.Write("Row " + i.ToString(CultureInfo.CurrentCulture) + ": ");
                for (int  j = 0; j < RowsInternal[i].ControlsInternal.Count; j++) {
                    Debug.Write(String.Format(CultureInfo.CurrentCulture, "[{0} {1}] ", RowsInternal[i].ControlsInternal[j].Name, ((ToolStripPanelCell)RowsInternal[i].Cells[j]).Margin));
                } 
                Debug.Write("\r\n");
           } 
        } 

        [Conditional("DEBUG")] 
        private void Debug_VerifyCountRows() {
            Debug.Assert(RowsInternal.Count <= Controls.Count, "How did the number of rows get larger than the number of controls?");
        }
 
        [Conditional("DEBUG")]
        private void Debug_VerifyNoOverlaps() { 
            foreach (Control c1 in this.Controls) { 
                foreach (Control c2 in this.Controls) {
                    if (c1 == c2) { 
                        continue;
                    }
                    Rectangle intersection = c1.Bounds;
                    intersection.Intersect(c2.Bounds); 

                    if (!LayoutUtils.IsZeroWidthOrHeight(intersection)) { 
                        ISupportToolStripPanel draggedToolStrip1 = c1 as ISupportToolStripPanel; 
                        ISupportToolStripPanel draggedToolStrip2 = c2 as ISupportToolStripPanel;
 
                        string fail = String.Format(CultureInfo.CurrentCulture,
                            "OVERLAP detection:\r\n{0}: {1} row {2} row bounds {3}",
                            c1.Name == null ? "" : c1.Name,
                            c1.Bounds, 
                            !RowsInternal.Contains(draggedToolStrip1.ToolStripPanelRow) ? "unknown" : RowsInternal.IndexOf(draggedToolStrip1.ToolStripPanelRow).ToString(CultureInfo.CurrentCulture),
                            draggedToolStrip1.ToolStripPanelRow.Bounds); 
 
                         fail += String.Format(CultureInfo.CurrentCulture,
                             "\r\n{0}: {1} row {2} row bounds {3}", 
                             c2.Name == null ? "" : c2.Name,
                             c2.Bounds,
                             !RowsInternal.Contains(draggedToolStrip2.ToolStripPanelRow) ? "unknown" : RowsInternal.IndexOf(draggedToolStrip2.ToolStripPanelRow).ToString(CultureInfo.CurrentCulture),
                             draggedToolStrip2.ToolStripPanelRow.Bounds); 
                        Debug.Fail(fail);
 
                    } 
                }
 
            }

        }
 
        /// 
        ///  
        ArrangedElementCollection IArrangedElement.Children { 
            get {
                return RowsInternal; 
            }
        }

        ///  
        [
        ListBindable(false), 
        ComVisible(false) 
        ]
        [SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")] 
        public class ToolStripPanelRowCollection : ArrangedElementCollection, IList {

            private ToolStripPanel owner;
            ///  
            public ToolStripPanelRowCollection(ToolStripPanel owner) {
                this.owner = owner; 
            } 

            ///  
            /// 
            /// [To be supplied.]
            /// 
            public ToolStripPanelRowCollection(ToolStripPanel owner, ToolStripPanelRow[] value) { 
                this.owner = owner;
                AddRange(value); 
            } 

            ///  
            /// 
            /// 
            /// 
            public new virtual ToolStripPanelRow this[int index] { 
                get {
                    return (ToolStripPanelRow)(InnerList[index]); 
                } 
            }
 
            /// 
            /// 
            /// [To be supplied.]
            ///  
            public int Add(ToolStripPanelRow value) {
                if (value == null) { 
                    throw new ArgumentNullException("value"); 
                }
                int retVal = InnerList.Add(value); 
                OnAdd(value, retVal);
                return retVal;

            } 

 
            ///  
            /// 
            /// [To be supplied.] 
            /// 
            public void AddRange(ToolStripPanelRow[] value) {
                if (value == null) {
                    throw new ArgumentNullException("value"); 
                }
 
                ToolStripPanel currentOwner = this.owner; 
                if (currentOwner != null) {
                    currentOwner.SuspendLayout(); 
                }
                try {
                    for (int i = 0; i < value.Length; i++) {
                        this.Add(value[i]); 
                    }
                } 
                finally { 
                    if (currentOwner != null) {
                        currentOwner.ResumeLayout(); 
                    }
                }
            }
            ///  
            /// 
            /// [To be supplied.] 
            ///  
            public void AddRange(ToolStripPanelRowCollection value) {
                if (value == null) { 
                    throw new ArgumentNullException("value");
                }

                ToolStripPanel currentOwner = this.owner; 
                if (currentOwner != null) {
                    currentOwner.SuspendLayout(); 
                } 
                try {
                    int currentCount = value.Count; 
                    for (int i = 0; i < currentCount; i++) {
                        this.Add(value[i]);
                    }
                } 
                finally {
                    if (currentOwner != null) { 
                        currentOwner.ResumeLayout(); 
                    }
                } 

            }

            ///  
            /// 
            /// [To be supplied.] 
            ///  
            public bool Contains(ToolStripPanelRow value) {
                return InnerList.Contains(value); 
            }

            /// 
            ///  
            /// [To be supplied.]
            ///  
            public virtual void Clear() { 
                if (owner != null) {
                    owner.SuspendLayout(); 
                }
                try {
                    while (Count != 0) {
                        RemoveAt(Count - 1); 
                    }
                } 
                finally { 
                    if (owner != null) {
                        owner.ResumeLayout(); 
                    }
                }
            }
 
            void IList.Clear() { Clear(); }
            bool IList.IsFixedSize { get { return InnerList.IsFixedSize; } } 
            bool IList.Contains(object value) { return InnerList.Contains(value); } 
            bool IList.IsReadOnly { get { return InnerList.IsReadOnly; } }
            void IList.RemoveAt(int index) { RemoveAt(index); } 
            void IList.Remove(object value) { Remove(value as ToolStripPanelRow); }
            int IList.Add(object value) { return Add(value as ToolStripPanelRow); }
            int IList.IndexOf(object value) { return IndexOf(value as ToolStripPanelRow); }
            void IList.Insert(int index, object value) { Insert(index, value as ToolStripPanelRow); } 

            ///  
            ///  
            object IList.this[int index] {
                get { return InnerList[index]; } 
                set { throw new NotSupportedException(SR.GetString(SR.ToolStripCollectionMustInsertAndRemove)); /* InnerList[index] = value; */ }
            }

 
            /// 
            ///  
            /// [To be supplied.] 
            /// 
            public int IndexOf(ToolStripPanelRow value) { 
                return InnerList.IndexOf(value);
            }

            ///  
            public void Insert(int index, ToolStripPanelRow value) {
                if (value == null) { 
                    throw new ArgumentNullException("value"); 
                }
 
                InnerList.Insert(index, value);
                OnAdd(value, index);

            } 

            private void OnAdd(ToolStripPanelRow value, int index) { 
                if (owner != null) { 
                    LayoutTransaction.DoLayout(owner, value, PropertyNames.Parent);
                } 
            }

            /// 
            ///  Do proper cleanup of ownership, etc. 
            /// 
            private void OnAfterRemove(ToolStripPanelRow row) { 
 
#if DEBUG
                    if (ToolStripPanelMissingRowDebug.TraceVerbose) { 
                       if (row != null) {
                          Debug.Write("Removing row: ");
                          row.Debug_PrintRowID();
                          Debug.WriteLine(new StackTrace().ToString()); 
                       }
                    } 
#endif 

            } 

            /// 
            /// 
            /// [To be supplied.] 
            /// 
            public void Remove(ToolStripPanelRow value) { 
                InnerList.Remove(value); 
                OnAfterRemove(value);
            } 

            /// 
            /// 
            /// [To be supplied.] 
            /// 
            public void RemoveAt(int index) { 
                ToolStripPanelRow item = null; 
                if (index < Count && index >= 0) {
                    item = (ToolStripPanelRow)(InnerList[index]); 
                }
                InnerList.RemoveAt(index);
                OnAfterRemove(item);
            } 

 
 
            /// 
            ///  
            /// [To be supplied.]
            /// 
            public void CopyTo(ToolStripPanelRow[] array, int index) {
                InnerList.CopyTo(array, index); 
            }
 
 

        } 

        internal class ToolStripPanelControlCollection : WindowsFormsUtils.TypedControlCollection {

            private ToolStripPanel owner; 

            public ToolStripPanelControlCollection(ToolStripPanel owner) 
                : base(owner, typeof(ToolStrip)) { 
                this.owner = owner;
            } 

            internal override void AddInternal(Control value) {
                if (value != null) {
                    using (new LayoutTransaction(value, value, PropertyNames.Parent)) { 
                        base.AddInternal(value);
                    } 
                } 
                else {
                    base.AddInternal(value); 
                }

            }
 
            internal void Sort() {
                if (owner.Orientation == Orientation.Horizontal) { 
                    InnerList.Sort(new YXComparer()); 
                }
                else { 
                    InnerList.Sort(new XYComparer());
                }
            }
 

            // sort by X, then Y 
            public class XYComparer : IComparer { 
                public XYComparer() { }
                public int Compare(object first, object second) { 
                    Control one = first as Control;
                    Control two = second as Control;

                    if (one.Bounds.X < two.Bounds.X) { 
                        return -1;
                    } 
 
                    if (one.Bounds.X == two.Bounds.X) {
                        if (one.Bounds.Y < two.Bounds.Y) { 
                            return -1;
                        }
                        return 1;
                    } 
                    return 1;
 
                } 
            }
 
            // sort by Y, then X
            public class YXComparer : IComparer {
                public YXComparer() { }
                public int Compare(object first, object second) { 
                    Control one = first as Control;
                    Control two = second as Control; 
 
                    if (one.Bounds.Y < two.Bounds.Y) {
                        return -1; 
                    }

                    if (one.Bounds.Y == two.Bounds.Y) {
                        if (one.Bounds.X < two.Bounds.X) { 
                            return -1;
                        } 
                        return 1; 
                    }
                    return 1; 

                }
            }
 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

                        

                        

                        
                        

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• ThreadStaticAttribute.cs
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