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：

usingSystem;
usingSystem.Windows.Forms;
namespaceWindowsApplication42
{
publicpartialclassForm1:Form
{
publicForm1(){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
constintWM_NCHITTEST=0x84;
protectedoverridevoidWndProc(refMessagem)
{
base.WndProc(refm);if(m.Msg==WM_NCHITTEST)
{
switch(m.Result.ToInt32())
{
case1://客户区
m.Result=newIntPtr(2);break;
case2://标题栏
m.Result=newIntPtr(1);break;
case20:m.Result=newIntPtr(0);break;
default:Console.WriteLine(m);break;
}
}
}
}
}

下面是各个常量的意义：从Delphi7VCL中摘取：

{WM_NCHITTESTandMOUSEHOOKSTRUCTMousePositionCodes}
{$EXTERNALSYMHTERROR}
HTERROR=-2;
{$EXTERNALSYMHTTRANSPARENT}
HTTRANSPARENT=-1;
{$EXTERNALSYMHTNOWHERE}
HTNOWHERE=0;
{$EXTERNALSYMHTCLIENT}
HTCLIENT=1;
{$EXTERNALSYMHTCAPTION}
HTCAPTION=2;
{$EXTERNALSYMHTSYSMENU}
HTSYSMENU=3;
{$EXTERNALSYMHTGROWBOX}
HTGROWBOX=4;
{$EXTERNALSYMHTSIZE}
HTSIZE=HTGROWBOX;
{$EXTERNALSYMHTMENU}
HTMENU=5;
{$EXTERNALSYMHTHSCROLL}
HTHSCROLL=6;
{$EXTERNALSYMHTVSCROLL}
HTVSCROLL=7;
{$EXTERNALSYMHTMINBUTTON}
HTMINBUTTON=8;
{$EXTERNALSYMHTMAXBUTTON}
HTMAXBUTTON=9;
{$EXTERNALSYMHTLEFT}
HTLEFT=10;
{$EXTERNALSYMHTRIGHT}
HTRIGHT=11;
{$EXTERNALSYMHTTOP}
HTTOP=12;
{$EXTERNALSYMHTTOPLEFT}
HTTOPLEFT=13;
{$EXTERNALSYMHTTOPRIGHT}
HTTOPRIGHT=14;
{$EXTERNALSYMHTBOTTOM}
HTBOTTOM=15;
{$EXTERNALSYMHTBOTTOMLEFT}
HTBOTTOMLEFT=16;
{$EXTERNALSYMHTBOTTOMRIGHT}
HTBOTTOMRIGHT=17;
{$EXTERNALSYMHTBORDER}
HTBORDER=18;
{$EXTERNALSYMHTREDUCE}
HTREDUCE=HTMINBUTTON;
{$EXTERNALSYMHTZOOM}
HTZOOM=HTMAXBUTTON;
{$EXTERNALSYMHTSIZEFIRST}
HTSIZEFIRST=HTLEFT;
{$EXTERNALSYMHTSIZELAST}
HTSIZELAST=HTBOTTOMRIGHT;
{$EXTERNALSYMHTOBJECT}
HTOBJECT=19;
{$EXTERNALSYMHTCLOSE}
HTCLOSE=20;
{$EXTERNALSYMHTHELP}
HTHELP=21;

希望本文所述对大家的C#程序设计有所帮助。