ToolStripGrip.cs source code in C# .NET

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

namespace System.Windows.Forms { 
    using System; 
    using System.Drawing;
    using System.Windows.Forms; 
    using System.Windows.Forms.VisualStyles;
    using System.Windows.Forms.Layout;
    using System.Diagnostics;
 
    /// 
    /// 
 
    internal class ToolStripGrip : ToolStripButton {
 
        private Cursor oldCursor;
        private int gripThickness = 0;
        Point startLocation = Point.Empty;
        private bool movingToolStrip = false; 
        private Point lastEndLocation = ToolStrip.InvalidMouseEnter;
        private static Size DragSize = LayoutUtils.MaxSize; 
 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        internal ToolStripGrip()	{ 
            // if we're using XP themes we've got to be a bit thicker.
            gripThickness = ToolStripManager.VisualStylesEnabled ? 5 : 3;
            SupportsItemClick = false;
        } 

 	    ///  
        /// Deriving classes can override this to configure a default size for their control. 
        /// This is more efficient than setting the size in the control's constructor.
        ///  
        protected internal override Padding DefaultMargin {
            get {
                return new Padding(2);
            } 
        }
 
        public override bool CanSelect { 
            get  {
                return false; 
            }
        }

        internal int GripThickness { 
            get {
                return gripThickness; 
            } 
        }
 
        internal bool MovingToolStrip {
            get {
                return ((ToolStripPanelRow != null) && movingToolStrip);
            } 
            set {
                if ((movingToolStrip != value) && ParentInternal != null) { 
                    if (value) { 
                        // dont let grips move the toolstrip
                        if (ParentInternal.ToolStripPanelRow == null) { 
                            return;
                        }
                    }
                    movingToolStrip = value; 
                    lastEndLocation = ToolStrip.InvalidMouseEnter;
                    if (movingToolStrip) { 
                       ((ISupportToolStripPanel)this.ParentInternal).BeginDrag(); 
                    }
                    else { 
                       ((ISupportToolStripPanel)this.ParentInternal).EndDrag();
                    }
                }
            } 
        }
 
        private ToolStripPanelRow ToolStripPanelRow { 
            get {
                return (ParentInternal == null) ? null : ((ISupportToolStripPanel)ParentInternal).ToolStripPanelRow; 
            }
        }

 
        protected override AccessibleObject CreateAccessibilityInstance() {
            return new ToolStripGripAccessibleObject(this); 
        } 

        public override Size GetPreferredSize(Size constrainingSize) { 
            Size preferredSize = Size.Empty;
            if (this.ParentInternal != null) {
                if (this.ParentInternal.LayoutStyle == ToolStripLayoutStyle.VerticalStackWithOverflow) {
                    preferredSize = new Size(this.ParentInternal.Width, gripThickness); 
                }
                else { 
                    preferredSize = new Size(gripThickness, this.ParentInternal.Height); 

                } 

            }
            // Constrain ourselves
            if (preferredSize.Width > constrainingSize.Width) { 
                preferredSize.Width = constrainingSize.Width;
            } 
 
            if (preferredSize.Height > constrainingSize.Height) {
                preferredSize.Height = constrainingSize.Height; 
            }

            return preferredSize;
        } 

        private bool LeftMouseButtonIsDown() { 
          return (Control.MouseButtons == MouseButtons.Left) && (Control.ModifierKeys == Keys.None); 
        }
 
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) {
            // all the grip painting should be on the ToolStrip itself.
            if (ParentInternal != null) {
                ParentInternal.OnPaintGrip(e); 
            }
        } 
 

        ///  
        ///
        /// 
        /// 
        protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs mea) { 
            startLocation =  TranslatePoint(new Point(mea.X, mea.Y), ToolStripPointType.ToolStripItemCoords, ToolStripPointType.ScreenCoords);
            base.OnMouseDown(mea); 
        } 

        protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs mea) { 
            bool leftMouseButtonDown = LeftMouseButtonIsDown();
            if (!MovingToolStrip && leftMouseButtonDown) {

                // determine if we've moved far enough such that the toolstrip 
                // can be considered as moving.
                Point currentLocation =  TranslatePoint(mea.Location, ToolStripPointType.ToolStripItemCoords, ToolStripPointType.ScreenCoords); 
                int deltaX = currentLocation.X - startLocation.X; 
                deltaX = (deltaX < 0) ? deltaX *-1 : deltaX;
 
                if (DragSize == LayoutUtils.MaxSize) {
                    DragSize = SystemInformation.DragSize;
                }
 
                if (deltaX >= DragSize.Width) {
                    MovingToolStrip = true; 
                } 
                else {
                     int deltaY = currentLocation.Y - startLocation.Y; 
                     deltaY = (deltaY < 0) ? deltaY *-1 : deltaY;

                    if (deltaY >= DragSize.Height) {
                        MovingToolStrip = true; 
                    }
                } 
 
            }
            if (MovingToolStrip) { 
                if (leftMouseButtonDown) {
                    Point endLocation = TranslatePoint(new Point(mea.X, mea.Y), ToolStripPointType.ToolStripItemCoords, ToolStripPointType.ScreenCoords);
                    // protect against calling when the mouse hasnt really moved.  moving the toolstrip/creating the feedback rect
                    // can cause extra mousemove events, we want to make sure we're not doing all this work 
                    // for nothing.
                    if (endLocation != lastEndLocation) { 
                        ToolStripPanelRow.ToolStripPanel.MoveControl(ParentInternal, /*startLocation,*/endLocation ); 
                        lastEndLocation = endLocation;
                    } 
                    startLocation = endLocation;
                }
                else {
                    // sometimes we dont get mouseup in DT.   Release now. 
                    MovingToolStrip = false;
                } 
            } 

            base.OnMouseMove(mea); 
        }

        protected override void OnMouseEnter(System.EventArgs e) {
 
            // only switch the cursor if we've got a rafting row.
            if ((ParentInternal != null) && (ToolStripPanelRow != null) && (!ParentInternal.IsInDesignMode)) { 
                oldCursor = ParentInternal.Cursor; 
                SetCursor(ParentInternal, Cursors.SizeAll);
            } 
            else {
                oldCursor = null;
            }
            base.OnMouseEnter(e); 

        } 
 
        /// 
        /// 
        /// 
        /// 
        protected override void OnMouseLeave(System.EventArgs e) {
            if (oldCursor != null && !ParentInternal.IsInDesignMode) { 
                SetCursor(ParentInternal,oldCursor);
            } 
            if (!MovingToolStrip && LeftMouseButtonIsDown()) { 
                MovingToolStrip = true;
            } 
            base.OnMouseLeave(e);
        }

 

        protected override void OnMouseUp(System.Windows.Forms.MouseEventArgs mea) { 
            if (MovingToolStrip) { 
                Point endLocation = TranslatePoint(new Point(mea.X, mea.Y), ToolStripPointType.ToolStripItemCoords, ToolStripPointType.ScreenCoords);
                ToolStripPanelRow.ToolStripPanel.MoveControl(ParentInternal, /*startLocation,*/endLocation ); 
            }

            if (!ParentInternal.IsInDesignMode) {
                SetCursor(ParentInternal, oldCursor); 
            }
            ToolStripPanel.ClearDragFeedback(); 
            MovingToolStrip = false; 
            base.OnMouseUp(mea);
        } 

        private static void SetCursor(Control control, Cursor cursor) {
            IntSecurity.ModifyCursor.Assert();
            control.Cursor = cursor; 
            // CodeAccessPermission.RevertAssert automatically called
        } 
 
        internal class ToolStripGripAccessibleObject : ToolStripButtonAccessibleObject {
            private string stockName; 

            public ToolStripGripAccessibleObject(ToolStripGrip owner) : base(owner){
            }
 
            public override string Name {
                get { 
                    string name = Owner.AccessibleName; 
                    if (name != null) {
                        return name; 
                    }
                    if (string.IsNullOrEmpty(stockName)) {
                        stockName = SR.GetString(SR.ToolStripGripAccessibleName);
                    } 
                    return stockName;
                } 
                set { 
                    base.Name  = value;
                } 
            }


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

 

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