It might be a very simple question but I can't figure out how to do it.
The context: I am making an application that can draw polygons in a QGraphicsScene. I would like to implement interactive actions. For example, the user clicks on a button, then clicks on the scene to draw temporary lines, finally the app cuts the polygon with the line.
What I try to achieve
What I did Since I didn't find anything here or in the doc, I looked in the LibreCad repository to know how they do it.
Their base class inherits from QObject to handle events. It seems that they don't inherit from QAction despite line 40 where one can read "class QAction;". My C++ skills end here. In an act of faith, I wrote the following minimal non-working example in python with PySide.
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
from PySide2.QtCore import QObject
from PySide2.QtWidgets import (QApplication, QMainWindow, QWidget,
QGraphicsView, QGraphicsScene,
QToolBar, QAction)
class Action(QAction, QObject):
def __init__(self, name, parent=None):
super().__init__(name, parent)
# I also tried to add this, obviously I don't know what I am doing
#QObject.__init__(parent)
def keyPressEvent(self, event):
print("Event handled")
super().keyPressEvent(event)
class MainWindow(QMainWindow,):
def __init__(self):
super(MainWindow, self).__init__()
self.centralwidget = QWidget()
self.graphicsView = QGraphicsView(self.centralwidget)
self.setCentralWidget(self.centralwidget)
self.scene = QGraphicsScene(0,0,1000,1000)
self.graphicsView.setScene(self.scene)
toolbar = QToolBar("My toolbar")
self.addToolBar(toolbar)
knifeActionButton = Action("Knife", self)
knifeActionButton.setShortcut("K")
knifeActionButton.triggered.connect(self.cutPolygon)
toolbar.addAction(knifeActionButton)
def cutPolygon(self):
print("Action triggered")
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MainWindow()
w.show()
app.exec_()
The question: How to handle events in a QAction to make it interactive?
Please excuse my English, I am a non-native speaker
