MenuStrip.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / MenuStrip.cs / 1305376 / MenuStrip.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

 
namespace System.Windows.Forms { 
    using System;
    using System.ComponentModel; 
    using System.Drawing;
    using System.Windows.Forms;
    using System.Diagnostics;
    using System.Runtime.InteropServices; 
    using System.Security.Permissions;
    using System.Windows.Forms.Layout; 
 
    /// 
    [ComVisible(true), 
     ClassInterface(ClassInterfaceType.AutoDispatch),
     SRDescription(SR.DescriptionMenuStrip)
    ]
    public class MenuStrip : ToolStrip { 

 
        private ToolStripMenuItem mdiWindowListItem = null; 

        private static readonly object EventMenuActivate = new object(); 
        private static readonly object EventMenuDeactivate = new object();


 
        /// 
        public MenuStrip() { 
            this.CanOverflow = false; 
            this.GripStyle = ToolStripGripStyle.Hidden;
            this.Stretch = true; 

        }

        internal override bool KeyboardActive { 
            get { return base.KeyboardActive; }
            set { 
                if (base.KeyboardActive != value) { 
                    base.KeyboardActive = value;
                    if (value) { 
                        OnMenuActivate(EventArgs.Empty);
                    }
                    else {
                        OnMenuDeactivate(EventArgs.Empty); 
                    }
                } 
            } 
        }
 

        [
        DefaultValue(false),
        SRDescription(SR.ToolStripCanOverflowDescr), 
        SRCategory(SR.CatLayout),
        Browsable(false) 
        ] 
        public new bool CanOverflow {
            get { 
                return base.CanOverflow;
            }
            set {
                base.CanOverflow = value; 
            }
        } 
        protected override bool DefaultShowItemToolTips { 
            get {
                return false; 
            }
        }
        protected override Padding DefaultGripMargin {
            get { 
                // VSWhidbey 448134 - ensure grip aligns properly when set visible.
                return new Padding(2, 2, 0, 2); 
            } 
        }
 
        /// 
        protected override Size DefaultSize {
            get {
                return new Size(200, 24); 
            }
        } 
 
        protected override Padding DefaultPadding {
            get { 
                // VSWhidbey 448134: scoot the grip over when present
                if (GripStyle == ToolStripGripStyle.Visible) {
                    return new Padding(3, 2, 0, 2);
                } 
                return new Padding(6, 2, 0, 2);
            } 
        } 

        [DefaultValue(ToolStripGripStyle.Hidden)] 
        public new ToolStripGripStyle GripStyle {
            get {
                return base.GripStyle;
            } 
            set {
                base.GripStyle = value; 
            } 
        }
 
        [SRCategory(SR.CatBehavior), SRDescription(SR.MenuStripMenuActivateDescr)]
        public event EventHandler MenuActivate {
            add {
                Events.AddHandler(EventMenuActivate, value); 
            }
            remove { 
                Events.RemoveHandler(EventMenuActivate, value); 
            }
        } 

        [SRCategory(SR.CatBehavior), SRDescription(SR.MenuStripMenuDeactivateDescr)]
        public event EventHandler MenuDeactivate {
            add { 
                Events.AddHandler(EventMenuDeactivate, value);
            } 
            remove { 
                Events.RemoveHandler(EventMenuDeactivate, value);
            } 
        }

        [DefaultValue(false)]
        [SRDescription(SR.ToolStripShowItemToolTipsDescr)] 
        [SRCategory(SR.CatBehavior)]
        public new bool ShowItemToolTips { 
            get { 
                return base.ShowItemToolTips;
            } 
            set {
                base.ShowItemToolTips = value;
            }
        } 

        [DefaultValue(true)] 
        [SRCategory(SR.CatLayout)] 
        [SRDescription(SR.ToolStripStretchDescr)]
        public new bool Stretch { 
            get {
                return base.Stretch;
            }
            set { 
                base.Stretch = value;
            } 
        } 

        [DefaultValue(null)] 
        [MergableProperty(false)]
        [SRDescription(SR.MenuStripMdiWindowListItem)]
        [SRCategory(SR.CatBehavior)]
        [TypeConverterAttribute(typeof(MdiWindowListItemConverter))] 
        public ToolStripMenuItem MdiWindowListItem {
            get { 
                return mdiWindowListItem; 
            }
            set { 
                mdiWindowListItem = value;
            }
        }
 
        /// 
        protected override AccessibleObject CreateAccessibilityInstance() { 
            return new MenuStripAccessibleObject(this); 
        }
        protected internal override ToolStripItem CreateDefaultItem(string text, Image image, EventHandler onClick) { 
            if (text == "-") {
                return new ToolStripSeparator();
            }
            else { 
                return new ToolStripMenuItem(text, image, onClick);
            } 
        } 

 
        protected virtual void OnMenuActivate(EventArgs e) {
            if (IsHandleCreated) {
                AccessibilityNotifyClients(AccessibleEvents.SystemMenuStart, -1);
            } 
            EventHandler handler = (EventHandler)Events[EventMenuActivate];
            if (handler != null) handler(this, e); 
        } 

        protected virtual void OnMenuDeactivate(EventArgs e) { 
            if (IsHandleCreated) {
                AccessibilityNotifyClients(AccessibleEvents.SystemMenuEnd, -1);
            }
            EventHandler handler = (EventHandler)Events[EventMenuDeactivate]; 
            if (handler != null) handler(this, e);
        } 
 
        /// 
        /// Called from ToolStripManager.ProcessMenuKey.  Fires MenuActivate event and sets focus. 
        /// 
        internal bool OnMenuKey() {
            if (!(Focused || ContainsFocus)) {
                Debug.WriteLineIf(ToolStrip.SnapFocusDebug.TraceVerbose, "[ProcessMenuKey] set focus to menustrip"); 
                ToolStripManager.ModalMenuFilter.SetActiveToolStrip(this, /*menuKeyPressed=*/true);
 
                if (DisplayedItems.Count > 0) { 
                    if (DisplayedItems[0] is MdiControlStrip.SystemMenuItem) {
                        SelectNextToolStripItem(DisplayedItems[0], /*forward=*/true); 
                    }
                    else {
                        // first alt should select "File".  Future keydowns of alt should restore focus.
                        SelectNextToolStripItem(null, /*forward=*/(RightToLeft == RightToLeft.No)); 
                    }
                } 
 
                return true;
            } 
            return false;
        }

        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] 
        protected override bool ProcessCmdKey(ref Message m, Keys keyData) {
 
            if (ToolStripManager.ModalMenuFilter.InMenuMode) { 
                // ALT, then space should dismiss the menu and activate the system menu.
                if (keyData == Keys.Space) { 
                    // if we're focused it's ok to activate system menu
                    // if we're not focused - we should not activate if we contain focus - this means a text box or something
                    // has focus.
                    if (Focused || !ContainsFocus) { 
                        NotifySelectionChange(null);
                        Debug.WriteLineIf(ToolStrip.SnapFocusDebug.TraceVerbose, "[MenuStrip.ProcessCmdKey] Rolling up the menu and invoking the system menu"); 
                        ToolStripManager.ModalMenuFilter.ExitMenuMode(); 
                        // send a WM_SYSCOMMAND SC_KEYMENU + Space to activate the system menu.
                        UnsafeNativeMethods.PostMessage(WindowsFormsUtils.GetRootHWnd(this), NativeMethods.WM_SYSCOMMAND, NativeMethods.SC_KEYMENU, (int)Keys.Space); 
                        return true;
                    }
                }
            } 
            return base.ProcessCmdKey(ref m, keyData);
 
 
        }
        ///  
        /// 
        /// Summary of WndProc.
        /// 
        ///  
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
        protected override void WndProc(ref Message m) { 
 
            if (m.Msg == NativeMethods.WM_MOUSEACTIVATE && (ActiveDropDowns.Count == 0)) {
                // call menu activate before we actually take focus. 
                Point pt = PointToClient(WindowsFormsUtils.LastCursorPoint);
                ToolStripItem item = GetItemAt(pt);
                if (item != null && !(item is ToolStripControlHost)) {
                    // verify the place where we've clicked is a place where we have to do "fake" focus 
                    // e.g. an item that isnt a control.
                    KeyboardActive = true; 
                } 
            }
 
            base.WndProc(ref m);
        }

        [System.Runtime.InteropServices.ComVisible(true)] 
        internal class MenuStripAccessibleObject : ToolStripAccessibleObject {
 
            public MenuStripAccessibleObject(MenuStrip owner) 
                : base(owner) {
            } 

            public override AccessibleRole Role {
                get {
                    AccessibleRole role = Owner.AccessibleRole; 
                    if (role != AccessibleRole.Default) {
                        return role; 
                    } 
                    return AccessibleRole.MenuBar;
                } 
            }
        }

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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MenuStrip.cs source code in C# .NET

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