QDockWidgetGroupWindow effectively sets new dockarea permissions on qdockwidget

ESP123

I have the following situation, tested also in minimal qt code in Creator:

create mainwindow and two dockwidgets A and B and enable all dockwidget features
set both dockwidgets allowed areas to one location only, RightDockWidgetArea for example
dock both them
now drag A out to float
drag B to float, but do not drop it, move it over A temporily and move it back to where it was, never dropping the dockwidget - A now has the hidden class object QDockWidgetGroupWindow as its parent, and its permissions are all messed up, it can dock anywhere .. .this is a problem for me and i need to get rid of it ... i tried watching for featureChanged event, but it is never called on the original dockwidget, its permissions are fine, but it seems the new parent causes this issue .. the problem is dockwidget A is only allowed in right area, but after this mouse manuever, it can go anywhere .. please help

#include "mainwindow.h"

#include <QApplication>
#include <QDockWidget>
#include <QIcon>
#include <QHBoxLayout>
#include <QGridLayout>
#include <QDebug>


class MyDW : public QDockWidget {

public:
    explicit MyDW(QWidget *parent): QDockWidget(parent, Qt::WindowFlags()) {
        setMouseTracking(true);
        w = dynamic_cast<QMainWindow *>(parent);
    }
    virtual ~MyDW() {}
protected:
    QMainWindow *w;
    virtual void mousePressEvent(QMouseEvent *event) override {
    }
};


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MainWindow outer;
    outer.show();
    outer.centralWidget()->setLayout(new QGridLayout);
    outer.centralWidget()->layout()->setContentsMargins(0,0,0,0);
    outer.centralWidget()->setMinimumSize(0,0);
    outer.setDockOptions(QMainWindow::AllowTabbedDocks | QMainWindow::GroupedDragging); // | QMainWindow::AllowNestedDocks);


    MyDW *d1 = new MyDW(&outer);
    d1->setWindowTitle("blue");
    d1->setFeatures(QDockWidget::AllDockWidgetFeatures);
    d1->setAllowedAreas(Qt::DockWidgetArea::LeftDockWidgetArea);

    MyDW *d2 = new MyDW(&outer);
    d2->setWindowTitle("red");
    d2->setFeatures(QDockWidget::AllDockWidgetFeatures);
    d2->setAllowedAreas(Qt::DockWidgetArea::RightDockWidgetArea);

    d1->show();
    d2->show();

    outer.addDockWidget(Qt::DockWidgetArea::LeftDockWidgetArea, d1);
    outer.addDockWidget(Qt::DockWidgetArea::RightDockWidgetArea, d2);

    return a.exec();
}

SGaist

Hi,

Which version of Qt ?
On which OS ?

ESP123

ok i think i have a workaround, but i still would like to know if there is a native Qt solution - this was a real pain for some time, only today i just found a solution but it is not ideal

Big Sur and Qt v 5.15 in Creator

I would attach a video but i am not allowed here it seems .. hpoefully the descr makes sense

ESP123

in fact, now i see there is still an issue, that the combination of floating qdockwidgets can be docked anywhere .. i cannot allow this but there is no way i know of to set these permissions on the hidden class object, which is not accessible ... seems to be a major bug in this system? please advise

ESP123

follow-up: can i set any docking permissions at all (even disable) on the group/combined dockwidgets inside QDockWidgetGroupWindow? it seems it does not respect the mainwindow settings either .. for example nested is allowed on the group even if disabled normally

SGaist

Looks like you may have found a bug.

You should check the bug report system to see if there's something about it.

Just in case there are other docking solution like KDAB's KDDockWidgets.

Axel Spoerl

It's a bug and we are working at it here.

Axel Spoerl

Fixed in 6.3, 6.2 and 15.5. Thanks for bringing this up.