CODEWITHSUNDEEP
pythonpyqtpyqt5qgraphicsview
aryan tyagi
aryan tyagi

Reputation: 11

How to detect a mouseButtonPressed event outside a QGraphicsView widget?

I have a QGraphicsView widget with a QGraphicsScene set in it. I wish to detect a mouseButtonPressed event anywhere in my application window outside of the QGraphicsView widget.

I tried to install an eventFilter to the central widget of the application as follows:

self.centralwidget.installEventFilter(self)

My QGraphicsView widget is self.viewStartImg. In my eventFilter method, I have the following:

def eventFilter(self, obj, event):
    if obj != self.viewStartImg and event.type() == QEvent.MouseButtonPress:
            print('Outside the QGraphicsView')

In my application, when I click inside of the QGraphicsView, I still get 'Outside the QGraphicsView' printed out. I believe that's happening because QGraphicsView is a child of the centralWidget, but I am not sure.

Any alternate method of achieving this functionality is highly appreciated!

Upvotes: 0

Views: 628

Answers (2)

Adam Sirrelle
Adam Sirrelle

Reputation: 397

It may not be exactly what you're looking for, but I recently needed to register when the user clicked outside my widget and used this method:

def event(self, event):
    
    if event == None:
        return False

    if event.type() == QtCore.QEvent.WindowDeactivate:
        print "Clicked outside"
        self.main_widget.close()

    return super(_ComboBoxPlusDialog, self).event(event)

I used this to close the window, as you can see. So it only registers the outside click once. I used this to get around an issue with Qt.Popup disabling input for the IME.

Upvotes: 0

Heike
Heike

Reputation: 24420

There are several ways to achieve this. One way would be to subclass QGraphicsView and override mousePressEvent in the subclass. Another possibility is to install an event filter on the view object. For the first method you would do something like this

from PyQt5 import QtWidgets, QtCore

class MyView(QtWidgets.QGraphicsView):
    def mousePressEvent(self, event):
        print('mouse pressed inside view')
        event.accept()

class MyWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()

        self.central = QtWidgets.QWidget(self)
        self.view = MyView(self.central)
        self.scene = QtWidgets.QGraphicsScene()
        self.view.setScene(self.scene)

        hlayout = QtWidgets.QHBoxLayout(self.central)
        hlayout.setContentsMargins(50,50,50,50)
        hlayout.addWidget(self.view)

        self.setCentralWidget(self.central)

    def mousePressEvent(self, event):
        print('mouse pressed ouside view')
        event.accept()

if __name__ == "__main__" :
    app = QtWidgets.QApplication([])
    win = MyWindow()
    win.show()
    app.exec()

And for the second one

class MyWindow(QtWidgets.QMainWindow):
    money_changed = QtCore.pyqtSignal(int)

    def __init__(self):
        super().__init__()

        self.central = QtWidgets.QWidget(self)
        self.view = QtWidgets.QGraphicsView(self.central)
        self.scene = QtWidgets.QGraphicsScene()
        self.view.setScene(self.scene)

        hlayout = QtWidgets.QHBoxLayout(self.central)
        hlayout.setContentsMargins(50,50,50,50)
        hlayout.addWidget(self.view)

        self.setCentralWidget(self.central)

        self.view.installEventFilter(self)

    def mousePressEvent(self, event):
        print('mouse pressed ouside view')
        event.accept()

    def eventFilter(self, object, event):
        if object == self.view and event.type() == QtCore.QEvent.MouseButtonPress:
            print('mouse pressed inside view')
            return True
        return super().eventFilter(object, event)

Upvotes: 1

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