在设计器中，先看效果：
1、鼠标离开
2、鼠标进入（手形光标没截出来）
3、鼠标单击
代码及其分析：
引用命名空间：
1 using System.ComponentModel;2 using System.ComponentModel.Design;3 using System.Drawing;4 using System.Windows.Forms;5 using System.Windows.Forms.Design;6 using System.Windows.Forms.Design.Behavior;
第一步：定义一个行为类EventBehavior，这个类继承了Behavior，对需要处理的事件进行重写，用于处理鼠标事件，代码很简单，就不需要解释了，代码如下：
1 class EventBehavior : Behavior 2 { 3 bool isPressed = false; 4 Control control; 5 6 public EventBehavior(Control control) 7 { 8 this.control = control; 9 }10 11 public override bool OnMouseDown(Glyph g, MouseButtons button, Point mouseLoc)12 {13 isPressed = true;14 return true;15 }16 17 public override bool OnMouseUp(Glyph g, MouseButtons button)18 {19 if (isPressed) 20 OnClick();21 22 isPressed = false;23 return true;24 }25 26 public override bool OnMouseEnter(Glyph g)27 {28 this.control.BackColor = Color.LightPink;29 return true;30 }31 32 public override bool OnMouseLeave(Glyph g)33 {34 this.control.BackColor = Color.FromKnownColor(KnownColor.Control);35 return true;36 }37 38 public void OnClick()39 {40 MessageBox.Show("你单击了我！");41 }42 }
第二步：定义一个EventGlyph类，这个类继承Glyph，实现自定义控件的选择和图像处理，代码如下：
1 class EventGlyph : Glyph 2 { 3 Control control; 4 BehaviorService behaviorSvc; 5 6 public EventGlyph(BehaviorService behaviorSvc, Control control) 7 : base(new EventBehavior(control)) 8 { 9 this.behaviorSvc = behaviorSvc;10 this.control = control;11 }12 13 public override Rectangle Bounds14 {15 get16 {17 Point edge = behaviorSvc.ControlToAdornerWindow(control);18 Size size = control.Size;19 Rectangle bounds = new Rectangle(edge.X, edge.Y, size.Width, size.Height);20 21 return bounds;22 }23 }24 25 public override Cursor GetHitTest(System.Drawing.Point p)26 {27 if (this.Bounds.Contains(p))28 {29 return Cursors.Hand;30 }31 32 return null;33 }34 35 public override void Paint(PaintEventArgs pe)36 {37 TextFormatFlags sf = TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.EndEllipsis;38 TextRenderer.DrawText(pe.Graphics, "设计时响应鼠标单击事件哦", this.control.Font, this.Bounds, Color.DarkBlue, Color.Transparent, sf);39 }
第三步：定义一个设计器EventControlDesigner，它将行为和绘制部分的内容绑定在设计器中，代码如下：
1 public class EventControlDesigner : ScrollableControlDesigner 2 { 3 private ISelectionService SelectionService 4 { 5 get 6 { 7 return this.GetService(typeof(ISelectionService)) as ISelectionService; 8 } 9 }10 11 public override GlyphCollection GetGlyphs(GlyphSelectionType selectionType)12 {13 GlyphCollection glyphs = base.GetGlyphs(selectionType);14 if (SelectionService != null)15 {16 if (SelectionService.PrimarySelection == this.Control)17 glyphs.Add(new EventGlyph(this.BehaviorService, this.Control));18 }19 return glyphs;20 }21 }
第四步：在自定义控件上使用设计器，代码如下：
1 [Designer(typeof(EventControlDesigner))]2 class EventControl:System.Windows.Forms.Control3 {4 }