Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WinForms / System / WinForms / Design / Behavior / GrabHandleGlyph.cs / 1 / GrabHandleGlyph.cs
namespace System.Windows.Forms.Design.Behavior { using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Design; using System.Diagnostics; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms.Design; using System.Runtime.InteropServices; ////// /// The GrabHandleGlyph represents the 8 handles of our new seleciton /// model. Note that the pen and brush are created once per instance of this class /// and re-used in our painting logic for perf. reasonse. /// internal class GrabHandleGlyph : SelectionGlyphBase { private bool isPrimary = false; ////// /// GrabHandleGlyph's constructor takes additional parameters: 'type' and 'primary selection'. /// Also, we create/cache our pen & brush here to avoid this action with every paint message. /// internal GrabHandleGlyph(Rectangle controlBounds, GrabHandleGlyphType type, Behavior behavior, bool primarySelection) : base(behavior) { isPrimary = primarySelection; hitTestCursor = Cursors.Default; rules = SelectionRules.None; // We +/- DesignerUtils.HANDLEOVERLAP because we want each GrabHandle to overlap the control by DesignerUtils.HANDLEOVERLAP pixels switch (type) { case GrabHandleGlyphType.UpperLeft: bounds = new Rectangle((controlBounds.X+DesignerUtils.HANDLEOVERLAP) - DesignerUtils.HANDLESIZE, (controlBounds.Y+DesignerUtils.HANDLEOVERLAP) - DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNWSE; rules = SelectionRules.TopSizeable | SelectionRules.LeftSizeable; break; case GrabHandleGlyphType.UpperRight: bounds = new Rectangle(controlBounds.Right - DesignerUtils.HANDLEOVERLAP, (controlBounds.Y+DesignerUtils.HANDLEOVERLAP) - DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNESW; rules = SelectionRules.TopSizeable | SelectionRules.RightSizeable; break; case GrabHandleGlyphType.LowerRight: bounds = new Rectangle(controlBounds.Right - DesignerUtils.HANDLEOVERLAP, controlBounds.Bottom-DesignerUtils.HANDLEOVERLAP, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNWSE; rules = SelectionRules.BottomSizeable | SelectionRules.RightSizeable; break; case GrabHandleGlyphType.LowerLeft: bounds = new Rectangle((controlBounds.X+DesignerUtils.HANDLEOVERLAP) -DesignerUtils.HANDLESIZE, controlBounds.Bottom-DesignerUtils.HANDLEOVERLAP, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNESW; rules = SelectionRules.BottomSizeable | SelectionRules.LeftSizeable; break; case GrabHandleGlyphType.MiddleTop: // Only add this one if there's room enough. Room is enough is as follows: // 2*HANDLEOVERLAP for UpperLeft and UpperRight handles, 1 HANDLESIZE for the MiddleTop handle, 1 HANDLESIZE // for padding if (controlBounds.Width >= (2 * DesignerUtils.HANDLEOVERLAP) + (2 * DesignerUtils.HANDLESIZE)) { bounds = new Rectangle(controlBounds.X + (controlBounds.Width/2) - (DesignerUtils.HANDLESIZE/2), (controlBounds.Y+DesignerUtils.HANDLEOVERLAP) - DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNS; rules = SelectionRules.TopSizeable; } break; case GrabHandleGlyphType.MiddleBottom: // Only add this one if there's room enough. Room is enough is as follows: // 2*HANDLEOVERLAP for LowerLeft and LowerRight handles, 1 HANDLESIZE for the MiddleBottom handle, 1 HANDLESIZE // for padding if (controlBounds.Width >= (2 * DesignerUtils.HANDLEOVERLAP) + (2 * DesignerUtils.HANDLESIZE)) { bounds = new Rectangle(controlBounds.X + (controlBounds.Width/2) - (DesignerUtils.HANDLESIZE/2), controlBounds.Bottom-DesignerUtils.HANDLEOVERLAP, DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeNS; rules = SelectionRules.BottomSizeable; } break; case GrabHandleGlyphType.MiddleLeft: // Only add this one if there's room enough. Room is enough is as follows: // 2*HANDLEOVERLAP for UpperLeft and LowerLeft handles, 1 HANDLESIZE for the MiddleLeft handle, 1 HANDLESIZE // for padding if (controlBounds.Height >= (2 * DesignerUtils.HANDLEOVERLAP) + (2 * DesignerUtils.HANDLESIZE)) { bounds = new Rectangle((controlBounds.X+DesignerUtils.HANDLEOVERLAP) - DesignerUtils.HANDLESIZE, controlBounds.Y + (controlBounds.Height/2) - (DesignerUtils.HANDLESIZE/2), DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeWE; rules = SelectionRules.LeftSizeable; } break; case GrabHandleGlyphType.MiddleRight: // Only add this one if there's room enough. Room is enough is as follows: // 2*HANDLEOVERLAP for UpperRight and LowerRight handles, 1 HANDLESIZE for the MiddleRight handle, 1 HANDLESIZE // for padding if (controlBounds.Height >= (2 * DesignerUtils.HANDLEOVERLAP) + (2 * DesignerUtils.HANDLESIZE)) { bounds = new Rectangle(controlBounds.Right - DesignerUtils.HANDLEOVERLAP, controlBounds.Y + (controlBounds.Height/2) - (DesignerUtils.HANDLESIZE/2), DesignerUtils.HANDLESIZE, DesignerUtils.HANDLESIZE); hitTestCursor = Cursors.SizeWE; rules = SelectionRules.RightSizeable; } break; default: Debug.Assert(false, "GrabHandleGlyph was called with a bad GrapHandleGlyphType."); break; } hitBounds = bounds; } ////// /// Very simple paint logic. /// public override void Paint(PaintEventArgs pe) { DesignerUtils.DrawGrabHandle(pe.Graphics, bounds, isPrimary, this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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