Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Design / MessageFilters / DragSelectionMessageFilter.cs / 1305376 / DragSelectionMessageFilter.cs
namespace System.Workflow.ComponentModel.Design { using System; using System.Drawing; using System.Diagnostics; using System.Collections; using System.Windows.Forms; using System.ComponentModel.Design; #region Class DragRectangleMessageFilter ///This behavior requires the coordinates in logical coordinate system internal class DragRectangleMessageFilter : WorkflowDesignerMessageFilter { #region Members and Constructor private Point startDrag = Point.Empty; private Point endDrag = Point.Empty; private bool dragStarted = false; internal event EventHandler DragComplete; private Cursor previousCursor = Cursors.Default; internal DragRectangleMessageFilter() { } #endregion #region MessageFilter Overrides protected override void Dispose(bool disposing) { try { DragStarted = false; } finally { base.Dispose(disposing); } } protected override bool OnMouseCaptureChanged() { DragStarted = false; return false; } protected override bool OnMouseDown(MouseEventArgs eventArgs) { Debug.Assert(this.dragStarted == false); if (eventArgs.Button == MouseButtons.Left) this.startDrag = this.endDrag = ParentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y)); return false; } protected override bool OnMouseMove(MouseEventArgs eventArgs) { WorkflowView parentView = ParentView; Point logicalPoint = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y)); //We do nothing if the logical coordinate is not in the active layout // float dragMultiply = 2.0f / (float)parentView.Zoom * 100.0f; if (!this.dragStarted && (eventArgs.Button & MouseButtons.Left) > 0 && (Math.Abs(this.startDrag.X - logicalPoint.X) > (int)(dragMultiply * (float)SystemInformation.DragSize.Width) || Math.Abs(this.startDrag.Y - logicalPoint.Y) > (int)(dragMultiply * (float)SystemInformation.DragSize.Height))) DragStarted = true; if (this.dragStarted) { if (!DragRectangle.IsEmpty) parentView.InvalidateLogicalRectangle(DragRectangle); this.endDrag = logicalPoint; if (!DragRectangle.IsEmpty) parentView.InvalidateLogicalRectangle(DragRectangle); } return this.dragStarted; } protected override bool OnMouseUp(MouseEventArgs eventArgs) { if (this.dragStarted) { WorkflowView parentView = ParentView; //Invalidate the old rectangle so that we state the drag is complete if (!DragRectangle.IsEmpty) parentView.InvalidateLogicalRectangle(DragRectangle); //End the actual drag/drop this.endDrag = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y)); DragStarted = false; //Send the notification of successful drag if (this.DragComplete != null) this.DragComplete(this, EventArgs.Empty); return true; } return false; } protected override bool OnKeyDown(KeyEventArgs eventArgs) { if (eventArgs.KeyValue == (int)Keys.Escape) DragStarted = false; return false; } protected override bool OnPaint(PaintEventArgs e, Rectangle viewPort, AmbientTheme ambientTheme) { if (this.dragStarted) { using (Brush dragRectangleBrush = new SolidBrush(Color.FromArgb(10, ambientTheme.SelectionForeColor))) { Rectangle dragRectangle = DragRectangle; e.Graphics.FillRectangle(dragRectangleBrush, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1); e.Graphics.DrawRectangle(ambientTheme.SelectionForegroundPen, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1); } } return false; } #endregion #region Helpers internal Rectangle DragRectangle { get { return new Rectangle(Math.Min(this.startDrag.X, this.endDrag.X), Math.Min(this.startDrag.Y, this.endDrag.Y), Math.Abs(this.endDrag.X - this.startDrag.X), Math.Abs(this.endDrag.Y - this.startDrag.Y)); } } protected bool DragStarted { get { return this.dragStarted; } set { if (this.dragStarted != value) { WorkflowView parentView = ParentView; if (value) { this.dragStarted = true; this.previousCursor = parentView.Cursor; parentView.Cursor = Cursors.Cross; parentView.Capture = true; } else { parentView.Capture = false; this.dragStarted = false; if (this.previousCursor != null) parentView.Cursor = this.previousCursor; if (!DragRectangle.IsEmpty) parentView.InvalidateLogicalRectangle(DragRectangle); } } } } #endregion } #endregion #region Class DragSelectionMessageFilter //This behavior needs logical coordinates internal sealed class DragSelectionMessageFilter : DragRectangleMessageFilter { #region Members and Constructor internal DragSelectionMessageFilter() { } #endregion #region MessageFilter Overrides protected override bool OnMouseDown(MouseEventArgs eventArgs) { if ((Control.ModifierKeys & Keys.Shift) > 0) { base.OnMouseDown(eventArgs); return true; } return false; } protected override bool OnMouseMove(MouseEventArgs eventArgs) { if ((Control.ModifierKeys & Keys.Shift) > 0) { base.OnMouseMove(eventArgs); return true; } return false; } protected override bool OnMouseUp(MouseEventArgs eventArgs) { if ((Control.ModifierKeys & Keys.Shift) > 0) { base.OnMouseUp(eventArgs); //Select all the shapes WorkflowView parentView = ParentView; if (!DragRectangle.IsEmpty && parentView.RootDesigner != null) { ActivityDesigner[] intersectingDesigners = CompositeActivityDesigner.GetIntersectingDesigners(parentView.RootDesigner, DragRectangle); ArrayList selectableComponents = new ArrayList(); foreach (ActivityDesigner activityDesigner in intersectingDesigners) selectableComponents.Add(activityDesigner.Activity); ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService; if (selectableComponents.Count > 0 && selectionService != null) selectionService.SetSelectedComponents((object[])selectableComponents.ToArray(typeof(object)), SelectionTypes.Replace); } return true; } return false; } protected override bool OnKeyUp(KeyEventArgs eventArgs) { base.OnKeyUp(eventArgs); if ((Control.ModifierKeys & Keys.Shift) == 0) DragStarted = false; return false; } #endregion } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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