C#怎么做一个永远没有焦点的窗口 类似输入法控制栏

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更好的阅读体验请查看原文:https://blog.csdn.net/accomp/article/details/7209052

在窗体加入如下代码,防止窗体获得焦点

  1. private const int WM_MOUSEACTIVATE = 0x21;
  2. private const int MA_NOACTIVATE = 3;
  3. protected override void WndProc(ref Message m)
  4. {
  5.     if (m.Msg == WM_MOUSEACTIVATE)
  6.     {
  7.         m.Result = new IntPtr(MA_NOACTIVATE);
  8.         return;
  9.     }
  10.     base.WndProc(ref m);
  11. } 
  12.  
  13. protected override bool ShowWithoutActivation
  14. {
  15.     get
  16.     {
  17.         return false;
  18.     }
  19. }
  20.  
  21.  
  22.  
  23.

 

然后再加入如下代码,防止窗体的控件获得焦点

  1. void SetChildControlNoFocus(Control ctrl)
  2. {
  3.     if (ctrl.HasChildren)
  4.         foreach (Button c in ctrl.Controls)
  5.         {
  6.             SetControlNoFocus(c);
  7.         }
  8. }
  9.  
  10. MethodInfo SetControlStyleMethod;
  11. object[] SetControlStyleArgs = new object[] { ControlStyles.Selectable, false };
  12. private void SetControlNoFocus(Button ctrl)
  13. {
  14.     SetControlStyleMethod.Invoke(ctrl, SetControlStyleArgs);
  15.     SetChildControlNoFocus(ctrl);
  16. }
  17.  
  18.  
  19.


最后就是在窗体的构造函数部分调用如下代码,完成初始化参数的任务

  1. SetControlStyleMethod = typeof(Button).GetMethod("SetStyle",
  2.     BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod);
  3. SetChildControlNoFocus(this);
  4. this.DoubleBuffered = true;
  5. SetStyle(ControlStyles.Selectable, false);
  6. this.TopMost = true;
  7. this.FormBorderStyle = FormBorderStyle.None;
  8. this.ShowIcon = false;
  9. this.ShowInTaskbar = false;
  10.  
  11.  
  12.


最后这个窗体,就永远无法获得焦点了