Events not fired when used Windows::SetParent on QApplication

[bbdaffy]

Hi,

I am a newbie to Qt, so please bear with me if I am asking silly questions. I am trying to perform SetParent on a child window which is a QApplication, but has no clue how to start. Therefore I am very interested in the code :

HWND window = findEmbeddedWindow();

Is it possible to paste some snipplet of the function findEmbeddedWindow() here? It will definitely be helpful to me. Thank you very much.

Best Regards...

[one]

I have a similar problem but exactly opposite -
I too have a 'server' and a 'client' and I need to bring the client into the 'server's QWidget.

my code is:

winHandle = ::FindWindowA(NULL, "My Client");
        if(winHandle != NULL)
        {
            ::ShowWindow(winHandle, SW_HIDE);
 
 
            // Remove the window border
            LONG lStyle = GetWindowLong(winHandle, GWL_STYLE);
            lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU);
            ::SetWindowLong(winHandle, GWL_STYLE, lStyle);
 
            ::SetParent(winHandle, (HWND)(ui->widget->effectiveWinId()));
            ::SetWindowPos(winHandle, HWND_TOP, ui->widget->pos().x(), ui->widget->pos().y(), 0, 0 , SWP_NOACTIVATE | SWP_FRAMECHANGED | SWP_NOSIZE | SWP_ASYNCWINDOWPOS);
            ::UpdateWindow(winHandle);
            ::ShowWindow(winHandle, SW_SHOW);
        }

winHandle = ::FindWindowA(NULL, "My Client");
        if(winHandle != NULL)
        {
            ::ShowWindow(winHandle, SW_HIDE);


            // Remove the window border
            LONG lStyle = GetWindowLong(winHandle, GWL_STYLE);
            lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU);
            ::SetWindowLong(winHandle, GWL_STYLE, lStyle);

            ::SetParent(winHandle, (HWND)(ui->widget->effectiveWinId()));
            ::SetWindowPos(winHandle, HWND_TOP, ui->widget->pos().x(), ui->widget->pos().y(), 0, 0 , SWP_NOACTIVATE | SWP_FRAMECHANGED | SWP_NOSIZE | SWP_ASYNCWINDOWPOS);
            ::UpdateWindow(winHandle);
            ::ShowWindow(winHandle, SW_SHOW);
        }

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the problem I'm facing is that sometimes (not always!) the servers' buttons become not responding.
I noticed that when such a case happens, the buttons don't respond as long as they are located in the middle of the screen. but, the weirdest thing is that if i move the whole window so the buttons are located close to the edge of the screen - they work! if i move it back to the center - they stop working again.
any idea?? someone?

[anda_skoa]

Have you tried using Qt's "foreign window" capability?

QWindow::fromWinId() to create a QWindow for the winHandle and then embedding it into the widget scene using QWidget::createWindowContainer()

Cheers,
_

[one]

can you explain exactly how to do so?
I tried, but couldn't get the window to actually be embedded in the server's widget.
the code I've tried was:

QWindow* win= QWindow::fromWinId((WId)winHandle);
QWidget *wid =  QWidget::createWindowContainer(win,ui->widget);

QWindow* win= QWindow::fromWinId((WId)winHandle);
QWidget *wid =  QWidget::createWindowContainer(win,ui->widget);

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the result I got was: the client's window shoed up small on the top left of the screen, not integrated at all.
thanks!

[anda_skoa]

Did you add wid to the layout of its parent?

Cheers,
_

[one]

no, how do you do so?

[anda_skoa]

Like for any other widget.

If ui->widget does not have a layout yet, create a simple one and add the child widget

QVBoxLayout *layout = new QVBoxLayout(ui->widget);
layout->addWidget(wid);

QVBoxLayout *layout = new QVBoxLayout(ui->widget);
layout->addWidget(wid);

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Cheers,
_

[one]

thanks for that but it didn't work.
I've realized that
QWindow::fromWinId((WId)winHandle) returns NULL and in the console it found:
fromWinId(): platform plugin does not support foreign windows.
how can i solve this?

[anda_skoa]

Interesting. The Windows platform plugin should have the ForeignWindow capability.

Which version of Qt are you using?

Cheers,
_