Setting Focus in floating QDockWidget

[Tom 2020]

Hey, im having a issue with setting the focus to anewly created QDOckWidget thats floating.

My basic process is that I create a QDockWidget and then try to give it focus. I've found that so if it is docked in the main window then it can receive focus however as soon as i call <setFloating(true)> it will no longer be allowed to get focus.

Can anyone explain why this happens so I can understand this problem and if so how its possible to fix it.

Heres the relevant code.

// QDockWidget Constructer, called on the mouse press event
DockPanel::DockPanel(QWidget *parent, QWidget * hold_widget, QString title, bool popup) :
	QDockWidget(parent),
	popup(popup)
{
	setObjectName(title);
	setFeatures(QDockWidget::DockWidgetMovable);
	DockPanelTitle * panel_title = new DockPanelTitle(this, title);

	setTitleBarWidget(panel_title);
	setWidget(hold_widget);

	if (popup)
	{
		setFocusPolicy(Qt::StrongFocus);
		setFloating(true); // it gives focus if this line is disabled but not if its active
		setFocus();
	}
}

// mousePressEevent, creates the new QDockWidget and adds it to the central window,
// The bottom part simply loops through my dockwidgets and attempts to give them focus to see if it works,
// the docked widgets recieve focus but the floating ones do not.
void WindowToolBarButton::mousePressEvent(QMouseEvent * e)
{
	QMainWindow * cw = window()->findChild<QMainWindow *>("CentralWindow");
	HolderWidget * widget_a = new HolderWidget(this);
	QPoint m = window()->mapToGlobal(cw->pos());	

	DockPanel * panel_a = new DockPanel(cw, widget_a, btn_label->text(), true);
	panel_a->setGeometry(m.x(), m.y(), 300, cw->height());

	cw->addDockWidget(Qt::RightDockWidgetArea, panel_a);

	cw->setFocus();
	QWidget * w = qApp->focusWidget();
	for (DockPanel * child : w->findChildren<DockPanel *>())
	{	
		child->setFocus();
		QString s = child->objectName();
		std::cout << "Widget: " + s.toStdString() + " has focus " << child->hasFocus() << std::endl;
	}
}

Any help would be appreciated as I dont really understand why this is happening, ive included everything I though would be useful but if something else is needed please let me know.

Thanks for taking the time to look at my problem

[SGaist]

Hi and welcome to devnet,

What version of Qt are you using ?
On what OS ?

[mrjj]

Hi
I assume setFloating use an internal signal or likewise since you cannot setFocus right after. ( didnt not check source)

Also, since its a window, activateWindow seems better since normally
setFocus on a Dock would focus its internal widget.

However, this works for me on Qt 5.12.6 win 10

    dw->setFloating(true);
    QTimer::singleShot(0, [dw]() {
     dw->activateWindow();
    });

[Tom 2020]

Sorry for the late reply, I actually managed to figure out how to get my intended behaviour, after calling <setFloating(true)> i needed to add <setWindowFlags(Qt::Window | Qt::FramelessWindowHint);> to make it able to take focus.