python 2.7 - in pyqt how to print "Ctrl+key" in QLineEdit when pressed Ctrl + anyKey -
here kode genereted event qlineedit put pressed key combination in textline ok shift key , alt key not ctrl key why ?
#!/usr/bin/python import sys pyqt4.qtcore import * pyqt4.qtgui import * def main(): app = qapplication(sys.argv) w = mywindow() w.show() sys.exit(app.exec_()) class mywindow(qwidget): def __init__(self, *args): qwidget.__init__(self, *args) self.la = qlabel("press tab in box:") self.le = mylineedit() layout = qvboxlayout() layout.addwidget(self.la) layout.addwidget(self.le) self.setlayout(layout) self.connect(self.le, signal("press"), self.update) def update(self): oldtext = str(self.le.text()) self.le.settext(self.le.mytext) class mylineedit(qlineedit): def __init__(self, *args): qlineedit.__init__(self, *args) self.mytext = "" def event(self, event): if event.type() == qevent.keypress: if event.modifiers() & qt.controlmodifier : in textline ok shift key , alt key can put variable self.mytext value in textline, not ctrl key why ?
print event.text() self.mytext = "ctrl+"+ event.text() self.emit(signal("press")) return true return qlineedit.event(self, event) if __name__ == "__main__": main()
the reason why original example doesn't work because many of ctrl+key combinations produce control characters - e.g. ctrl+j produces newline.
the correct way capture keyboard combinations using qkeysequence, work all keys, including function keys, arrow keys, page up/down keys, etc. can translated shortcuts using qkeysequence.portabletext.
here's demo based on original example:
import sys pyqt4.qtcore import * pyqt4.qtgui import * def main(): app = qapplication(sys.argv) w = mywindow() w.show() sys.exit(app.exec_()) class mywindow(qwidget): def __init__(self, *args): qwidget.__init__(self, *args) self.la = qlabel("press tab in box:") self.le = mylineedit() layout = qvboxlayout() layout.addwidget(self.la) layout.addwidget(self.le) self.setlayout(layout) self.le.keypressed.connect(self.update) def update(self, text): self.le.settext(text) mod_mask = (qt.ctrl | qt.alt | qt.shift | qt.meta) class mylineedit(qlineedit): keypressed = pyqtsignal(str) def keypressevent(self, event): keyname = '' key = event.key() modifiers = int(event.modifiers()) if (modifiers , modifiers & mod_mask == modifiers , key > 0 , key != qt.key_shift , key != qt.key_alt , key != qt.key_control , key != qt.key_meta): keyname = qkeysequence(modifiers + key).tostring() print('event.text(): %r' % event.text()) print('event.key(): %d, %#x, %s' % (key, key, keyname)) self.keypressed.emit(keyname) if __name__ == "__main__": main() 
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