捕获鼠标单击窗体上的任何位置（不带IMessageFilter）

问题描述

当鼠标悬停在子Control上时，不会调用 MouseDown 事件。我尝试了 KeyPreview = true; ，但没有帮助（尽管对于 KeyDown -键盘单击而言确实如此）。 / p>

我正在寻找类似 KeyPreview 的东西，但是要进行鼠标事件。

我宁愿不使用 IMessageFilter 来处理WinAPI消息（如果有的话）。替代方法（也将 IMessageFilter 设置为 Application -wide。我只希望 Form -wide。）并遍历所有对象子控件每个订阅都有其缺点。

解决方案

您仍然可以使用MessageFilter并仅过滤ActiveForm：

 私有类MouseDownFilter：IMessageFilter {
公共事件EventHandler FormClicked; 
 private int WM_LBUTTONDOWN = 0x201; 
私人表格form = null; 
 
 [DllImport（ user32.dll）] 
公共静态外部布尔IsChild（IntPtr hWndParent，IntPtr hWnd）; 
 
 public MouseDownFilter（Form f）{
 form = f; 
} 
 
 public bool PreFilterMessage（ref Message m）{
 if（m.Msg == WM_LBUTTONDOWN）{
 if（Form.ActiveForm！= null& & Form.ActiveForm.Equals（form））{
 OnFormClicked（）; 
} 
} 
返回false； 
} 
 
受保护的无效OnFormClicked（）{
 if（FormClicked！= null）{
 FormClicked（form，EventArgs.Empty）; 
} 
} 
} 
  

然后在您的表格中附加它：

 公共Form1（）{
 InitializeComponent（）; 
 MouseDownFilter mouseFilter = new MouseDownFilter（this）; 
 mouseFilter.FormClicked + = mouseFilter_FormClicked; 
 Application.AddMessageFilter（mouseFilter）; 
} 
 
 void mouseFilter_FormClicked（object sender，EventArgs e）{
 //做某事... 
} 
  

The MouseDown event isn't called when the mouse is over a child Control. I tried KeyPreview = true; but it doesn't help (though it does for KeyDown - keyboard clicks).

I'm looking for something like KeyPreview, but for mouse events.

I rather not use IMessageFilter and process the WinAPI message if there's a simpler. alternative (Also, IMessageFilter is set Application-wide. I want Form-wide only.) And iterating over all child Controls, subscribing each, has its own disadvantages.

解决方案

You can still use MessageFilter and just filter for the ActiveForm:

private class MouseDownFilter : IMessageFilter {
  public event EventHandler FormClicked;
  private int WM_LBUTTONDOWN = 0x201;
  private Form form = null;

  [DllImport("user32.dll")]
  public static extern bool IsChild(IntPtr hWndParent, IntPtr hWnd);

  public MouseDownFilter(Form f) {
    form = f;
  }

  public bool PreFilterMessage(ref Message m) {
    if (m.Msg == WM_LBUTTONDOWN) {
      if (Form.ActiveForm != null && Form.ActiveForm.Equals(form)) {
        OnFormClicked();
      }
    }
    return false;
  }

  protected void OnFormClicked() {
    if (FormClicked != null) {
      FormClicked(form, EventArgs.Empty);
    }
  }
}

Then in your form, attach it:

public Form1() {
  InitializeComponent();
  MouseDownFilter mouseFilter = new MouseDownFilter(this);
  mouseFilter.FormClicked += mouseFilter_FormClicked;
  Application.AddMessageFilter(mouseFilter);
}

void mouseFilter_FormClicked(object sender, EventArgs e) {
  // do something...
}

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