检测所有形式最小化的情况 [英] Detect all situations where form is minimized

问题描述

我需要检测何时最小化表单（以隐藏覆盖表单）。我拦截了 WM_SYSCOMMAND 消息，如果我单击表单的最小化按钮，它会正常运行，但是如果我使用[Windows] + [M]，似乎不会触发此事件。此外，在这种情况下不会触发 WM_ACTIVATE 和 WM_ACTIVATEAPP 。

I need to detect when a form is minimized (to hide overlay form). I intercept WM_SYSCOMMAND message and it works fine if I click the form's minimize button, but this event seems not to be fired if I use [Windows] + [M]. Also, WM_ACTIVATE and WM_ACTIVATEAPP are not triggered in this case.

我可以使用什么事件，还有什么其他情况需要检测？

What event could I use and are there any other situations that I would have to detect?

推荐答案

如此处所述， 如何检测何时最大化表单？ ，听 WM_SIZE 消息。

As explained here, How to detect when the form is being maximized?, listen to the WM_SIZE messages.

以您的形式声明：

procedure WMSize(var Msg: TMessage); message WM_SIZE;

执行：

procedure TForm1.WMSize(var Msg: TMessage);
begin
  Inherited;
  if Msg.WParam  = SIZE_MINIMIZED then
    ShowMessage('Minimized');
end;

更新

另请参阅 @bummi 的答案，其中有一个 Application.MainFormOnTaskbar = false 时的解决方案。

See also the answer by @bummi where there is a solution when Application.MainFormOnTaskbar = false.

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