[PyQt] mouseMoveEvent.button() return always 0

[Maurizio Berti]

The behavior is similar to QWidget's mouseMoveEvent (
http://doc.qt.io/archives/qt-4.8/qmouseevent.html#button ):

Note that the returned value is always Qt::NoButton for mouse move events


Also, as soon as a mousePressEvent is catched, Qt always sends a
mouseMoveEvent, and for that first event only, the button() result is
correct.
You have to use buttons() instead :-)


Il giorno gio 25 ott 2018 alle ore 10:36 Vincent Vande Vyvre <
vincent.vande.vyvre at telenet.be> ha scritto:

> Hi,
>
> I've a subclass QGraphicsScene with a mouseMoveEvent() handler.
>
> I need to know what button is pressed during the move but, strangely,
> the event dont return the button.  It's always 0
>
> Platform Linux-4.15.0-38-generic-x86_64-with-Ubuntu-18.04-bionic
> Qt            5.9.5
> Python        3.6.6
> PyQt        5.10.1
> Sip            4.19.7
>
> Example code:
> ---%<--------------------------------------------------------------------
> # -*- coding: utf-8 -*-
> import sys
> from PyQt5 import QtCore, QtGui, QtWidgets
>
> class Main(QtWidgets.QMainWindow):
>      def __init__(self):
>          super().__init__()
>          self.resize(500, 500)
>          self.viewer = QtWidgets.QGraphicsView()
>          self.setCentralWidget(self.viewer)
>          self.scene = Scene()
>          self.viewer.setScene(self.scene)
>
> class Scene(QtWidgets.QGraphicsScene):
>      def __init__(self):
>          super().__init__()
>          self.setSceneRect(0.0, 0.0, 450.0, 450.0)
>
>      def mouseMoveEvent(self, event):
>          print(event, "button: ", event.button())
>
> if __name__ == "__main__":
>      app = QtWidgets.QApplication([])
>      main = Main()
>      main.show()
>      sys.exit(app.exec_())
> ---%<--------------------------------------------------------------------
>
>
> Thanks,
>
> Vincent
>
> _______________________________________________
> PyQt mailing list    PyQt at riverbankcomputing.com
> https://www.riverbankcomputing.com/mailman/listinfo/pyqt



-- 
È difficile avere una convinzione precisa quando si parla delle ragioni del
cuore. - "Sostiene Pereira", Antonio Tabucchi
http://www.jidesk.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.riverbankcomputing.com/pipermail/pyqt/attachments/20181025/fc6f5a7e/attachment-0001.html>