Docking and moving a frameless window?

[StudentScripter]

So i used the frameless window hint to remove the titlebar and implemented a custom menubar which lets me move, maximise, minimize and close the window.
However when i move very fast the window sometimes gets stuck somehow, but i couldn't figure out why and what im doing wrong?
Also i couldn't figure out how to make the window dock/snap when being dragged to the sides or far top or bottom:

#include "CustomMenubar.h"
#include <QApplication>
#include <QMouseEvent>

CustomMenuBar::CustomMenuBar(QWidget *parent)
    : QMenuBar{parent}
{


}



void CustomMenuBar::mousePressEvent(QMouseEvent *event)
{
    QAction *action = actionAt(event->pos());
    if (action && action->menu()) {
        // If a MenuItem with a submenu is clicked, we won't start moving the window
        clickedOnMenuItem = true;
        isMoving = false;
        QMenuBar::mousePressEvent(event);
    } else {
        QMenuBar::mousePressEvent(event);
        pressPos = event->globalPosition();
        isMoving = true;
        event->accept();
    }


}

void CustomMenuBar::mouseReleaseEvent(QMouseEvent *event)
{
    QAction *action = actionAt(event->pos());
    if (action && action->menu()) {

        QMenuBar::mouseReleaseEvent(event);
        return;
    }

    // If the mouse was being used for dragging, stop moving
    if (isMoving) {
        isMoving = false;
        event->accept();
    }
}

void CustomMenuBar::mouseMoveEvent(QMouseEvent *event)
{
    QAction *action = actionAt(event->pos());
    if (action && action->menu()) {

        QMenuBar::mouseMoveEvent(event);
        return;
    }


    // If the mouse was pressed and is moving, move the window
    if (isMoving) {
        QMenuBar::mouseMoveEvent(event);
        QPointF diff = event->globalPosition() - pressPos;
        QWidget *window = QApplication::topLevelAt(pressPos.toPoint());
        if (window && window->isWindow()) {
            window->move(window->pos() + diff.toPoint());
            pressPos = event->globalPosition();
            event->accept();
        }
    }
}

Thanks in advance. :) Have a nice evening.

[Pl45m4]

@StudentScripter

But we are already dealing with a QDockWidget, aren't we?
AFAIK you can only dock QDockWidgets and its subclasses.

Has your QMainWindow and/or window all dockAreas enabled?

• https://doc.qt.io/qt-6/qt.html#DockWidgetArea-enum

[StudentScripter]

@Pl45m4 No i don't mean a qdockwidget i mean the docking behaviour of window. Like normally you can append a window to a side of the screen like splitscreen, so another application can fit on the other side.

When calling frameless window this ability gets lost so i was looking for a way to manually recover it. Any idea?

[Pl45m4]

@StudentScripter

This?

It's called Split Window / Window Tile or something like that and is a Window Manager functionality (in your case, X on Windows 7/10).
Because frameless Qt toplevel Widgets don't request a Window decoration, I think X does not recognize that you want to snap/split it anyway.
This is probably not doable with Qt only and platform/Window Manager dependent, maybe you need some extension. Haven't found one though.

Edit:
If you are fine with not using the native functionality, you could try to implement something like that using your Qt widget... when enabled, calculate the requested area (1/2, 1/4...) of your screen size and geometry and resize + move your widget accordingly.