This is a definition of a decorator function that checks which modifier keys are being pressed and adds a keyword argument to a method. This argument is a tuple of names (strings) of the modifier keys that have been pressed when the method was called (or triggered).
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | #!/usr/bin/env python
# -*- coding: utf-8 -*-
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication
import functools
modies = { 'shift': Qt.ShiftModifier,
'control': Qt.ControlModifier,
'alt': Qt.AltModifier,
'meta': Qt.MetaModifier }
def check_modifiers(org_meth):
"""Add modifiers kwarg to a method that contains a tuple of currently pressed modifiers."""
@functools.wraps(org_meth)
def wrapper(*args, **kwargs):
curr = QApplication.keyboardModifiers()
kwargs['modifiers'] = tuple( name for name, which in modies.items() if curr & which == which )
org_meth(*args, **kwargs)
return wrapper
if __name__ == '__main__':
import sip
from PyQt4 import QtGui, QtCore
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
centralWidget = QtGui.QWidget(self)
layout = QtGui.QHBoxLayout(centralWidget)
self.setCentralWidget(centralWidget)
self.clickButton = QtGui.QPushButton("click", centralWidget)
self.clickButton.clicked.connect(self.klick)
layout.addWidget(self.clickButton)
self.statusBar()
self.setFixedWidth(600)
@check_modifiers
def klick(self, event, modifiers):
ms = QtGui.QApplication.keyboardModifiers()
m = "keyboardModifiers: {1:0=32b} {0} has been pressed"
self.statusBar().showMessage(m.format(repr(modifiers), int(ms)))
import sys
app = QtGui.QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_())
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I had to check for pressed modifier keys independently (not for a certain combination) in four different methods. Since this is quiet verbose in PyQt on one hand and on the other I needed to use that information in several different places in the methods it seemed a nice way to put this into a decorator that passes a variable that contains all information needed.
