window_changed_signaler.py
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32 
33 from python_qt_binding.QtCore import QEvent, QObject, Signal
34 
35 
36 class WindowChangedSignaler(QObject):
37  """Signaler for for filtered events of an icon or title change of a widget."""
38 
39  hide_signal = Signal(object)
40  show_signal = Signal(object)
41 
42  window_icon_changed_signal = Signal(object)
43  window_title_changed_signal = Signal(object)
44 
45  def __init__(self, widget, parent=None):
46  super(WindowChangedSignaler, self).__init__(parent)
47  self._widget = widget
48  self.setObjectName('WindowChangedSignaler__' + self._widget.objectName())
49  self._recursive_invocation = False
50  self._widget.installEventFilter(self)
51 
52  def emit_all(self):
53  if self._widget.isVisible():
54  self.show_signal.emit(self._widget)
55  else:
56  self.hide_signal.emit(self._widget)
57  self.window_icon_changed_signal.emit(self._widget)
58  self.window_title_changed_signal.emit(self._widget)
59 
60  def eventFilter(self, watched, event):
61  if event.type() == QEvent.Hide:
62  self.hide_signal.emit(watched)
63 
64  if event.type() == QEvent.Show:
65  self.show_signal.emit(watched)
66 
67  if event.type() == QEvent.WindowIconChange:
68  # prevent emitting recursive event when emitted signal will trigger another event
69  if not self._recursive_invocation:
70  self._recursive_invocation = True
71  self.window_icon_changed_signal.emit(watched)
72  self._recursive_invocation = False
73 
74  if event.type() == QEvent.WindowTitleChange:
75  # prevent emitting recursive event when emitted signal will trigger another event
76  if not self._recursive_invocation:
77  self._recursive_invocation = True
78  self.window_title_changed_signal.emit(watched)
79  self._recursive_invocation = False
80 
81  return QObject.eventFilter(self, watched, event)


qt_gui
Author(s): Dirk Thomas
autogenerated on Sun Nov 1 2020 04:03:22