C#教程之WinForm实现拦截窗体上各个部位的点击特

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C#教程之WinForm实现拦截窗体上各个部位的点击特

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。

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