Qt Keyboard Shortcut Editor

qt_key_shortcut_editor.py

import sys
from PyQt4 import QtGui, QtCore
import warnings


class KeySequenceEdit(QtGui.QLineEdit):
    """
    This class is mainly inspired by
    http://stackoverflow.com/a/6665017

    """

    def __init__(self, keySequence, *args):
        super(KeySequenceEdit, self).__init__(*args)
        self.setText(keySequence)
        self.npressed = 0
        self.keys = set()

    def keyPressEvent(self, e):
        if e.type() == QtCore.QEvent.KeyPress:

            key = e.key()
            self.npressed += 1

            if key == QtCore.Qt.Key_unknown:
                warnings.warn("Unknown key from a macro probably")
                return

            # the user have clicked just and only the special keys
            # Ctrl, Shift, Alt, Meta.
            if (key == QtCore.Qt.Key_Control or
                    key == QtCore.Qt.Key_Shift or
                    key == QtCore.Qt.Key_Alt or
                    key == QtCore.Qt.Key_Meta):
                return

            modifiers = e.modifiers()
            if modifiers & QtCore.Qt.ShiftModifier:
                    key += QtCore.Qt.SHIFT
            if modifiers & QtCore.Qt.ControlModifier:
                key += QtCore.Qt.CTRL
                self.npressed -= 1
            if modifiers & QtCore.Qt.AltModifier:
                key += QtCore.Qt.ALT
            if modifiers & QtCore.Qt.MetaModifier:
                key += QtCore.Qt.META

            self.keys.add(key)

    def keyReleaseEvent(self, e):
        if e.type() == QtCore.QEvent.KeyRelease:
            self.npressed -= 1

            if self.npressed <= 0:
                pt = QtGui.QKeySequence.PortableText
                print("New KeySequence:",
                      QtGui.QKeySequence(*self.keys).toString(pt))
                keySequence = QtGui.QKeySequence(*self.keys)

                self.setText(keySequence.toString(pt))
                self.keys = set()
                self.npressed = 0


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    w = KeySequenceEdit('Ctrl+C')
    w.show()
    sys.exit(app.exec_())