[Qt-interest] Minimizing Mfc application with open Qt dialog

[elizabeta petreska]

Nobody knows nothing about this :( ?

On Sat, Sep 26, 2009 at 9:04 PM, elizabeta petreska <
elizabeta.petreska at gmail.com> wrote:

> Hello
>
> I am using QtWinMigrate solution to show dialogs from my plugin dlls that
> are loaded in third party Mfc application. The problem is the following :
>
> When I minimize the main window of my Mfc application, and when I restore
> it back again, all of my open Qt dialogs are lost. I found out that actually
> my Qt dialogs are destroyed i.e destructors are called.
>
> I did some debugging and discovered the following :
>
> When I close my Mfc main window my Qt dialog gets WM_SHOWWINDOW message
> with SW_PARENTCLOSING wparam parametar. Then QtWndProc is called, which for
> the SW_PARENTCLOSING case issues sends QHideEvent:
>
> in QtWndProc() function in file qapplication_win.cpp line 2160
>
> case WM_SHOWWINDOW :
>     if(lparam==SW_PARENTCLOSING) {
>        QHideEvent e;
>        qt_sendSpontaneousEvent(widget,e);
>        widget->hideChildren(true); ////////////////////
>
> and the eventFilter  of QWinWidget sends DefferedDelete who deletes my
> dialog :
>
> in QWinWidget.cpp in line 280
>
> QWinWidget::eventFilter(OObject* o, QEvent* e)
> {
>      ....
>     case QEvent::Hide:
>         if(w->testAtrribute(Qt::WA_DeleteOnClose)
>           deleteLater();
> }
>
> Can someone please explain this behavior to me? This seems like bug to me
> .
>
> Thanks
>
>
>
>
>
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