ToolStripDropDownButton.cs source code in C# .NET

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

namespace System.Windows.Forms { 
    using System; 
    using System.Collections;
    using System.ComponentModel; 
    using System.Drawing;
    using Microsoft.Win32;
    using System.Drawing.Imaging;
    using System.Threading; 
    using System.Diagnostics;
    using System.Windows.Forms.ButtonInternal; 
    using System.Windows.Forms.Layout; 
    using System.Security.Permissions;
    using System.Security; 
    using System.Windows.Forms.Design;
    /// 
    /// 
    /// A ToolStripButton that can display a popup. 
    /// 
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)] 
    public class ToolStripDropDownButton : ToolStripDropDownItem { 

        private bool showDropDownArrow = true; 
        private byte openMouseId = 0;

        /// 
        ///  
        /// Constructs a ToolStripButton that can display a popup.
        ///  
        public ToolStripDropDownButton() { 
            Initialize();
        } 
        public ToolStripDropDownButton(string text):base(text,null,(EventHandler)null) {
            Initialize();
        }
        public ToolStripDropDownButton(Image image):base(null,image,(EventHandler)null) { 
            Initialize();
        } 
        public ToolStripDropDownButton(string text, Image image):base(text,image,(EventHandler)null) { 
            Initialize();
        } 
        public ToolStripDropDownButton(string text, Image image, EventHandler onClick):base(text,image,onClick) {
            Initialize();
        }
        public ToolStripDropDownButton(string text, Image image, EventHandler onClick, string name) :base(text,image,onClick,name){ 
            Initialize();
        } 
        public ToolStripDropDownButton(string text, Image image, params ToolStripItem[] dropDownItems):base(text,image,dropDownItems) { 
            Initialize();
        } 

        [DefaultValue(true)]
        public new bool AutoToolTip {
            get { 
                return base.AutoToolTip;
            } 
            set { 
                base.AutoToolTip = value;
            } 
        }


        protected override bool DefaultAutoToolTip { 
            get {
               return true; 
            } 
        }
 
        /// 
        [
        DefaultValue(true),
        SRDescription(SR.ToolStripDropDownButtonShowDropDownArrowDescr), 
        SRCategory(SR.CatAppearance)
        ] 
        public bool ShowDropDownArrow { 
            get {
                return showDropDownArrow; 
            }
            set {
                if (showDropDownArrow != value) {
                    showDropDownArrow = value; 
                    this.InvalidateItemLayout(PropertyNames.ShowDropDownArrow);
                } 
            } 
        }
        ///  
        /// Creates an instance of the object that defines how image and text
        /// gets laid out in the ToolStripItem
        /// 
        internal override ToolStripItemInternalLayout CreateInternalLayout() { 
            return new ToolStripDropDownButtonInternalLayout(this);
        } 
 

        protected override ToolStripDropDown CreateDefaultDropDown() { 
             // AutoGenerate a Winbar DropDown - set the property so we hook events
              return new ToolStripDropDownMenu(this, /*isAutoGenerated=*/true);
        }
 
        /// 
        /// Called by all constructors of ToolStripButton. 
        ///  
        private void Initialize() {
            SupportsSpaceKey = true; 
        }

        /// 
        ///  
        /// Overriden to invoke displaying the popup.
        ///  
        protected override void OnMouseDown(MouseEventArgs e) { 
            if ((Control.ModifierKeys != Keys.Alt) &&
                (e.Button == MouseButtons.Left)) { 
                    if (DropDown.Visible) {
                        ToolStripManager.ModalMenuFilter.CloseActiveDropDown(DropDown, ToolStripDropDownCloseReason.AppClicked);
                    }
                    else { 
                        // opening should happen on mouse down.
                        Debug.Assert(ParentInternal != null, "Parent is null here, not going to get accurate ID"); 
                        openMouseId = (ParentInternal == null) ? (byte)0: ParentInternal.GetMouseId(); 
                        this.ShowDropDown(/*mousePush =*/true);
                    } 
            }
            base.OnMouseDown(e);
        }
 
        protected override void OnMouseUp(MouseEventArgs e) {
            if ((Control.ModifierKeys != Keys.Alt) && 
                (e.Button == MouseButtons.Left)) { 
                Debug.Assert(ParentInternal != null, "Parent is null here, not going to get accurate ID");
                byte closeMouseId = (ParentInternal == null) ? (byte)0: ParentInternal.GetMouseId(); 
                if (closeMouseId != openMouseId) {
                    openMouseId = 0;  // reset the mouse id, we should never get this value from toolstrip.
                    ToolStripManager.ModalMenuFilter.CloseActiveDropDown(DropDown, ToolStripDropDownCloseReason.AppClicked);
                    Select(); 
                }
            } 
            base.OnMouseUp(e); 
        }
 
        protected override void OnMouseLeave(EventArgs e) {
            openMouseId = 0;  // reset the mouse id, we should never get this value from toolstrip.
            base.OnMouseLeave(e);
        } 
        /// 
        ///  
        /// Inheriting classes should override this method to handle this event. 
        /// 
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { 

            if (this.Owner != null) {
                ToolStripRenderer renderer = this.Renderer;
                Graphics g = e.Graphics; 

                renderer.DrawDropDownButtonBackground(new ToolStripItemRenderEventArgs(e.Graphics, this)); 
 
                if ((DisplayStyle & ToolStripItemDisplayStyle.Image) == ToolStripItemDisplayStyle.Image) {
                    renderer.DrawItemImage(new ToolStripItemImageRenderEventArgs(g, this, InternalLayout.ImageRectangle)); 
                }

                if ((DisplayStyle & ToolStripItemDisplayStyle.Text) == ToolStripItemDisplayStyle.Text) {
                     renderer.DrawItemText(new ToolStripItemTextRenderEventArgs(g, this, this.Text, InternalLayout.TextRectangle, this.ForeColor, this.Font, InternalLayout.TextFormat)); 
                }
                if (ShowDropDownArrow) { 
                    ToolStripDropDownButton.ToolStripDropDownButtonInternalLayout layout = InternalLayout as ToolStripDropDownButtonInternalLayout; 
                    Rectangle dropDownArrowRect = (layout != null) ? layout.DropDownArrowRect :Rectangle.Empty;
 
                    Color arrowColor =  Enabled ? SystemColors.ControlText : SystemColors.ControlDark;
                    renderer.DrawArrow(new ToolStripArrowRenderEventArgs(g, this,dropDownArrowRect, arrowColor, ArrowDirection.Down));
                }
            } 
        }
 
 
        /// 
 
        [UIPermission(SecurityAction.LinkDemand, Window=UIPermissionWindow.AllWindows)]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1720:AvoidTypeNamesInParameters")] // 'charCode' matches control.cs
        protected internal override bool ProcessMnemonic(char charCode) {
             // checking IsMnemonic is not necesssary - toolstrip does this for us. 
             if (HasDropDownItems) {
                 Select(); 
                 ShowDropDown(); 
                 return true;
             } 
             return false;
         }

 
        internal class ToolStripDropDownButtonInternalLayout : ToolStripItemInternalLayout {
            private ToolStripDropDownButton    ownerItem; 
            private static Size             dropDownArrowSize       = new Size(5,3); 
            private static Padding          dropDownArrowPadding    = new Padding(2);
            private Rectangle               dropDownArrowRect       = Rectangle.Empty; 

            public ToolStripDropDownButtonInternalLayout(ToolStripDropDownButton ownerItem) : base(ownerItem) {
                this.ownerItem = ownerItem;
            } 

            public override Size GetPreferredSize(Size constrainingSize) { 
 
                Size preferredSize = base.GetPreferredSize(constrainingSize);
                if (ownerItem.ShowDropDownArrow) { 
                    if (ownerItem.TextDirection == ToolStripTextDirection.Horizontal) {
                        preferredSize.Width += DropDownArrowRect.Width + dropDownArrowPadding.Horizontal;
                    }
                    else { 
                        preferredSize.Height += DropDownArrowRect.Height + dropDownArrowPadding.Vertical;
                    } 
                } 
                return preferredSize;
            } 

            protected override ToolStripItemLayoutOptions CommonLayoutOptions() {
               ToolStripItemLayoutOptions options = base.CommonLayoutOptions();
 
               if (ownerItem.ShowDropDownArrow) {
 
                    if (ownerItem.TextDirection == ToolStripTextDirection.Horizontal) { 

                        // We're rendering horizontal....  make sure to take care of RTL issues. 

                        int widthOfDropDown = dropDownArrowSize.Width + dropDownArrowPadding.Horizontal;
                        options.client.Width -= widthOfDropDown;
 
                        if (ownerItem.RightToLeft == RightToLeft.Yes) {
 
                            // if RightToLeft.Yes: [ v | rest of drop down button ] 
                            options.client.Offset(widthOfDropDown, 0);
                            dropDownArrowRect = new Rectangle(dropDownArrowPadding.Left,0, dropDownArrowSize.Width, ownerItem.Bounds.Height); 
                        }
                        else {
                           // if RightToLeft.No [ rest of drop down button | v ]
                           dropDownArrowRect = new Rectangle(options.client.Right,0, dropDownArrowSize.Width, ownerItem.Bounds.Height); 

                        } 
                    } 
                    else {
                        // else we're rendering vertically. 
                        int heightOfDropDown = dropDownArrowSize.Height + dropDownArrowPadding.Vertical;

                        options.client.Height -= heightOfDropDown;
 
                        //  [ rest of button / v]
                        dropDownArrowRect = new Rectangle(0,options.client.Bottom + dropDownArrowPadding.Top, ownerItem.Bounds.Width-1, dropDownArrowSize.Height); 
 
                    }
 
               }
               return options;
            }
 
            public Rectangle DropDownArrowRect {
                get { 
                      return dropDownArrowRect; 
                }
            } 

        }

    } 
}
 
 


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

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