WinForm特效:拦截窗体上各个部位的点击

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安抓客户区拖动，并禁用了关闭按钮。 其中m.Result从-2到21都有定义，分别度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。

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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;  
 
                }  
 
            }  
 
        }  
 
    }  
 
} 

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：

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{ 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;