如何在Delphi中隐藏MDI子窗体? [英] How to hide a MDI Child form in Delphi?
问题描述
我在MDI子窗体的FormClose()事件中使用这段代码,但似乎不工作:
程序TfrmInstrument.FormClose(发件人:TObject; var Action:TCloseAction);
begin
动作:= caNone;
ShowWindow(Handle,SW_HIDE);
frmMainForm.MDIChildClosed(Handle);
结束
我的子窗口被最小化而不是被隐藏。
在 TCustomForm
中有一个受保护的过程定义为:
procedure TCustomForm.VisibleChanging;
begin
if(FormStyle = fsMDIChild)和Visible和(Parent = nil)然后
raise EInvalidOperation.Create(SMDIChildNotVisible);
结束
在您的MDI子窗口中覆盖它:
procedure TMDIChildForm.VisibleChanging;
begin
// :-P
end;
在阅读了Jeroen的评论后,我尝试了另一种解决方案,但是有一点闪烁:
procedure TMDIChildForm.VisibleChanging;
begin
if Visible then
FormStyle:= fsNormal
else
FormStyle:= fsMDIChild;
结束
也许这适用于所有Windows版本。
PS:我没有发现Windows 2k3SP2 x86和Windows 7 Ultimate x86上的第一个解决方案有任何问题
How can I hide a MDIChild window in Delphi?
I'm using this code in FormClose() event of my MDI children, but it doesn't seem to work:
procedure TfrmInstrument.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Action := caNone;
ShowWindow(Handle, SW_HIDE);
frmMainForm.MDIChildClosed(Handle);
end;
My child window is minimized instead of being hidden.
There is a protected procedure in TCustomForm
defined as:
procedure TCustomForm.VisibleChanging;
begin
if (FormStyle = fsMDIChild) and Visible and (Parent = nil) then
raise EInvalidOperation.Create(SMDIChildNotVisible);
end;
Override it in your MDI child windows as:
procedure TMDIChildForm.VisibleChanging;
begin
// :-P
end;
After reading Jeroen's comment, I tried another solution which works as well, but with a little flickering:
procedure TMDIChildForm.VisibleChanging;
begin
if Visible then
FormStyle := fsNormal
else
FormStyle := fsMDIChild;
end;
Maybe this works on all Windows versions.
PS: I didn't find any problem with the first solution on Windows 2k3SP2 x86 and Windows 7 Ultimate x86
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