[Interest] QMdiSubWindow resize() does include the frame

[Constantin Makshin]

This is not a bug -- as both John and Qt documentation say, the
frame-client area distinction applies only to top-level widgets/windows
(quote from the page you gave link to: "Note that the distinction only
matters for decorated top-level widgets. For all child widgets, the frame
geometry is equal to the widget's client geometry."). And since
QMdiSubWindow is not a top-level window, the behavior you describe is
correct.
On Apr 24, 2013 11:28 PM, "Immanuel Weber" <immanuel.weber at gmail.com> wrote:

> Thanks John for the code. It works fine. I'm not really into the qt
> internals, I don't know if it is enough to overload in QMdiSubWindow size()
> and resize() to account for your code snippets. Should this be reported as
> a bug?
>
> Am Mittwoch, 24. April 2013 um 17:49 schrieb John Weeks:
>
> OK- this time I got the correct message sent to the correct address. Sorry
> about that whole series of mistakes. I gotta say, I really disagree with
> the general notion that putting the list as the Reply To: is a bad thing...
>
>
>
>
> Yep- I got caught by this one, too. The explanation is that a
> QMdiSubWindow isn't actually a window, it's a child widget of the QMdiArea
> that contains it. Consequently, what looks like a window title bar is
> actually a child widget drawn by Qt. As such, the whole "window" is the
> QMdiSubWindow.
>
> That doesn't really help, does it?
>
> Here's my code to get the titlebar height in order to correct it:
>
> ----------------------------
>   if ( (myWidget()->windowFlags() & Qt::FramelessWindowHint) != 0)
> return 0;
>
> QStyle * wStyle = myWidget()->style();
> QStyleOptionTitleBar so;
> so.titleBarState = 1; // kThemeStateActive
> so.titleBarFlags = Qt::Window;
>
> // it seems that pixelMetric includes the frame in the titlebar height.
>
> int titleBarHeight = wStyle->pixelMetric(QStyle::PM_TitleBarHeight, &so, myWidget());
> #ifdef MACIGOR
> titleBarHeight -= 4; // pixelMetric adds 4 pixels for some unknown reason.
> #endif
>
> return titleBarHeight;
> ----------------------------
>
> You will also need the frame width:
>
> ----------------------------
>   if ( (myWidget()->windowFlags() & Qt::FramelessWindowHint) != 0)
> return 0;
>
> QStyle * wStyle = myWidget()->style();
> QStyleOptionTitleBar so;
> so.titleBarState = 1; // kThemeStateActive
> so.titleBarFlags = Qt::Window;
>
>
> return wStyle->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth , &so, myWidget());
> ----------------------------
>
>
> If anyone sees a problem with this, I'd be interested in hearing about it.
> So far it seems to work, at least on Macintosh and Windows.
>
> -John Weeks
>
>
> On 23-Apr-2013, at 1:22 PM, Immanuel Weber wrote:
>
>  Hi all,
>
> I'm trying to set the inner area of a QMdiSubArea to a specific size, but
> the the resize(..) member of QMdiSubArea includes the frame. As stated in
> the documentation (
> http://qt-project.org/doc/qt-5.0/qtwidgets/application-windows.html#window-geometry)
> resize(..) (belonging to size()) should exclude the frame and set the size
> of the inner area, but it sets the size of the complete sub window.
> Matching that, size() returns the same frame-including-value as frameSize()
> does. I know that there are (non-beautiful/simple) ways to do that, by
> determining the border width of a sub window, but I'm just curious why we
> have such an inconsitency here.
> I add a minimal example, where you can see the normal behavior and the one
> of the sub window.
> In addition there is a commented resize command, which produces
> (uncommented) on my machines another strange behavior: the window is moved
> to the top left corner of the screen, so that the header bar of the window
> lies outside of it.
>
> #include <QApplication>
> #include <QtWidgets/QtWidgets>
> #include <QDebug>
>
>
> int main(int argc, char *argv[])
> {
>     QApplication a(argc, argv);
>     QPushButton * button = new QPushButton("button");
>     QMdiArea area;
>     QMdiSubWindow * sub = area.addSubWindow(button);
>     area.show();
>     qDebug() << "strange: "<<  sub->size() << sub->frameSize();
>     qDebug() << "expected: " << area.size() << area.frameSize();
>
> //    area.resize(500, 500);
>
>     return a.exec();
> }
>
> (all on Win7 x64 with a Qt 5.0.1/.2 x86 MSVC release)
>
> Any ideas on that?
> Greetings
> Immanuel
>
>
>
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