Qt/win: showMaximized() overlapping taskbar on a frameless window - qt

Question

I'm building an Qt-Application without the default window border as a frameless window.
The window functions are included by setting window flags in the QMainWindow like:
MainDialog::MainDialog(QWidget *parent):
QMainWindow(parent), currentProject(NULL), currentUser(NULL),
aViews(new QList<AViewForm*>()),
bViews(new QList<BViewForm*>()),
cViews(new QList<CViewForm*>())
{
ui.setupUi(this);
this->statusBar()->showMessage(tr(""));
this->setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint | Qt::WindowSystemMenuHint);
...
}
The MainWindow has an .ui file within, thats why I cannot inherit from QDesktopWidget.
The Problem I have now is that the Appication overlays the windows taskbar when maximizing.
My Question now: is there any posibility to find out the available height of the OS desktop without the
availableGeometry().height()
-Method of QDesktopWidget? I cannot find anything in the documentation :(
Somebody else here asked a similar Question but used a QWidget instead of a QMainWindow.
I would be glad about any hints to my Problem

Answer 1

As you say you can use QDesktopWidget. If you don't have your class inherit from it you can create one in your constructor just for retrieving the height :
QDesktopWidget w;
int availableHeight = w.availableGeometry().height();

Answer 2

Guess thats not good practise, but i solved it as followed:
I built a new class which needs a MainWindow as param and with slots for the scaling actions:
FullScreen::FullScreen(QMainWindow &mainWindow, QObject *parent) : QObject(parent), mainWindow(mainWindow)
{
this->saveCurrentPosition();
}
void FullScreen::maximize()
{
this->saveCurrentPosition();
mainWindow.move(QApplication::desktop()->mapToGlobal(QApplication::desktop()->availableGeometry().topLeft()));
mainWindow.resize(QApplication::desktop()->availableGeometry().size());
}
void FullScreen::normalize()
{
mainWindow.move(lastGlobalPosition);
mainWindow.resize(lastSize);
}
void FullScreen::saveCurrentPosition()
{
lastGlobalPosition = mainWindow.mapToGlobal(mainWindow.rect().topLeft());
lastSize = mainWindow.size();
}
The only Problem which now occures is when the application is fullscreen and you move the taskbar. I have not set any resizeEvent though