子类化Button[Control.OnMouseMove 方法]

下面的代码示例演示如何重写派生类中的 OnMouseHover 和 OnMouseMove 方法。 要运行该示例，请将以下代码粘贴到一个新窗体中并将该类粘贴到此窗体的后面，以构成同一个文件。 将一个 FunButton 类型的按钮添加到窗体中。

public class FunButton:
Button

{
protected override void OnMouseHover(System.EventArgs e)
{

// Get the font size in Points, add one to the
// size, and reset the button's font to the larger
// size.
float fontSize = Font.SizeInPoints;
fontSize += 1;
System.Drawing.Size buttonSize = Size;
this.Font = new System.Drawing.Font(
Font.FontFamily, fontSize, Font.Style);

// Increase the size width and height of the button
// by 5 points each.
Size = new System.Drawing.Size(Size.Width+5, Size.Height+5);

// Call myBase.OnMouseHover to activate the delegate.
base.OnMouseHover(e);
}

protected override void OnMouseMove(MouseEventArgs e)
{

// Make the cursor the Hand cursor when the mouse moves
// over the button.
Cursor = Cursors.Hand;

// Call MyBase.OnMouseMove to activate the delegate.
base.OnMouseMove(e);
}
}