WinForm实现拦截窗体上各个部位的点击特效实例

本文实例讲述了winform实现拦截窗体上各个部位的点击特效，是一个非常实用的技巧。分享给大家供大家参考。具体分析如下：

一般来说，windows窗体的标题栏无法直接通过一些默认的事件来控制，需要了解和wm_nchittest相关的windows消息。

以下示例演示了最简单的效果片断：他会把客户区和标题栏的效果互换，比如无法按住标题栏拖动窗体而是改为了按住客户区拖动，并禁用了关闭按钮。 其中m.result从-2到21都有定义，分别对应了整个窗体的各个部位，比如1代表客户区，8代表最小化按钮等等。

具体功能代码如下：

using system; 
using system.windows.forms; 
namespace windowsapplication42 
{ 
 public partial class form1 : form 
 { 
  public form1() { initializecomponent(); this.text = "双击左上角图标关闭窗体"; } 
  //拦击标题栏鼠标位置事件 
  const int wm_nchittest = 0x84; 
  protected override void wndproc(ref message m) 
  { 
   base.wndproc(ref m); if (m.msg == wm_nchittest) 
   { 
    switch (m.result.toint32()) 
    { 
     case 1://客户区 
      m.result = new intptr(2); break; 
     case 2://标题栏 
      m.result = new intptr(1); break; 
     case 20: m.result = new intptr(0); break; 
     default: console.writeline(m); break; 
    } 
   } 
  } 
 } 
}

下面是各个常量的意义：从delphi7 vcl中摘取：

{ wm_nchittest and mousehookstruct mouse position codes } 
 {$externalsym hterror} 
 hterror = -2; 
 {$externalsym httransparent} 
 httransparent = -1; 
 {$externalsym htnowhere} 
 htnowhere = 0; 
 {$externalsym htclient} 
 htclient = 1; 
 {$externalsym htcaption} 
 htcaption = 2; 
 {$externalsym htsysmenu} 
 htsysmenu = 3; 
 {$externalsym htgrowbox} 
 htgrowbox = 4; 
 {$externalsym htsize} 
 htsize = htgrowbox; 
 {$externalsym htmenu} 
 htmenu = 5; 
 {$externalsym hthscroll} 
 hthscroll = 6; 
 {$externalsym htvscroll} 
 htvscroll = 7; 
 {$externalsym htminbutton} 
 htminbutton = 8; 
 {$externalsym htmaxbutton} 
 htmaxbutton = 9; 
 {$externalsym htleft} 
 htleft = 10; 
 {$externalsym htright} 
 htright = 11; 
 {$externalsym httop} 
 httop = 12; 
 {$externalsym httopleft} 
 httopleft = 13; 
 {$externalsym httopright} 
 httopright = 14; 
 {$externalsym htbottom} 
 htbottom = 15; 
 {$externalsym htbottomleft} 
 htbottomleft = 16; 
 {$externalsym htbottomright} 
 htbottomright = 17; 
 {$externalsym htborder} 
 htborder = 18; 
 {$externalsym htreduce} 
 htreduce = htminbutton; 
 {$externalsym htzoom} 
 htzoom = htmaxbutton; 
 {$externalsym htsizefirst} 
 htsizefirst = htleft; 
 {$externalsym htsizelast} 
 htsizelast = htbottomright; 
 {$externalsym htobject} 
 htobject = 19; 
 {$externalsym htclose} 
 htclose = 20; 
 {$externalsym hthelp} 
 hthelp = 21;

希望本文所述对大家的c#程序设计有所帮助。