Qt detecting mouse click on titleBar (Windows)

Question

event or mousePressEvent functions works for inside of a widget but I want to catch when clicked on a titleBar (upper part of menuBar, contains close button etc.)

How can I do that?

The question has clear signs of the XY Problem. What are you trying to accomplish? — IInspectable
– IInspectable, Commented Sep 8, 2017 at 10:45
I have a dialog that is minimized in its parent window when escape button pressed. I want to maximize it back if mouse clicked in its titleBar area. — RainMan14
– RainMan14, Commented Sep 8, 2017 at 11:12
@iinspectable his question was about coordinates and you answered with a link about an XY Problem, I thought you were on to a classic computer science problem about getting coordinates in a different origin. — Techniquab
– Techniquab, Commented Nov 6, 2020 at 2:25

pat · Accepted Answer · 2017-09-08 12:56:28Z

1

You can override nativeEvent, then get mouse position to compare with geometry (exclude window frame) and frameGeometry (include window frame) to detect if it hits title bar or not

bool MyClass::nativeEvent(const QByteArray & eventType, void * message, long * result)
{
    MSG* msg = (MSG*)(message);
    if (msg->message == WM_NCLBUTTONDOWN)
    {

        int mouseX = GET_X_LPARAM(msg->lParam);
        int mouseY = GET_Y_LPARAM(msg->lParam);
        QRect frame = frameGeometry();
        QRect content = geometry();

        qDebug() << "mouseX: " << mouseX << "mouseY:" << mouseY;
        qDebug() << "frame: " << frame;
        qDebug() << "content: " << content;

        if (mouseY < content.y() && mouseY >= frame.y())
        {
            qDebug() << "Hit title bar";
        }
    }

    *result = 0;
    return false;
}

answered Sep 8, 2017 at 12:56

pat

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Techniquab · Accepted Answer · 2020-11-06 03:12:22Z

Here's the PyQt implementation.

from  PyQt5.QtWidgets import *
from  PyQt5.QtCore import *

import ctypes.wintypes
import logging
from win32con import *
import win32api

class W(QTabWidget):
    def nativeEvent(self, eventType, message):
        click_menu = QMenu(self)
        click_menu.addAction("Yay")

        try:
            msg = ctypes.wintypes.MSG.from_address(message.__int__())
        except:
            logging.error("", exc_info=True)
        if eventType == "windows_generic_MSG":
            if msg.message == WM_NCLBUTTONDOWN:
                mouse_x = win32api.LOWORD(msg.lParam)
                mouse_y = win32api.HIWORD(msg.lParam)
                frame = self.frameGeometry()
                content = self.geometry()
                print(mouse_x, mouse_y, frame, content)
                if mouse_y < content.y() and mouse_y >= frame.y():

                    click_menu.exec_(QPoint(mouse_x, mouse_y))

        return False, 0

app = QApplication([])

w = W()
w.resize(1000,100)
w.move(0,0)
w.show()
app.exec_()

One thing I can't figure out about this, what happens to my menu if I click the titlebar again without clicking the menu. The menu disappears, which is then allows me to move the titlebar when clicking - which is good...but I can't reliably bring the menu back up

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