当 parentWidget 关闭时，浮动 QDockWidget 不会关闭
floating QDockWidget does not close when parentWidget closes
我有两个打开的 MainWindows：MainWindowWithButton 和 MainWindowWithDock。后者包含一个 QDockWidget。
IS 行为：当用户使 DockWidget 可浮动并关闭 MainWindowWithDock 时，dockWidget 不会关闭。
应该行为：当用户使 DockWidget 可浮动并关闭 MainWindowWithDock 时，dockWidget 也会关闭。
备注：
- "IS behaviour" 的原因：浮动的 DockWidget 似乎独立于它的父级
- 我无法监听 onClose / reject（因为在我的特殊情况下它会提供错误信息。
- MainWindow 没有发出关于其行为的明确信号
- 重要的是，DockWidget 在 MainWindow 关闭之前关闭。否则焦点会意外
示例代码：
from PyQt4 import QtCore, QtGui
from PyQt4 import QtCore, QtGui
from PyQt4.QtGui import QApplication, QDialog, QMainWindow
import sys
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindowWithButton(object):
def setupUi(self, MainWindowWithButton):
MainWindowWithButton.setObjectName(_fromUtf8("MainWindowWithButton"))
MainWindowWithButton.resize(567, 384)
self.centralwidget = QtGui.QWidget(MainWindowWithButton)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
MainWindowWithButton.setCentralWidget(self.centralwidget)
def retranslateUi(self, MainWindowWithButton):
MainWindowWithButton.setWindowTitle(_translate("MainWindowWithButton", "MainWindow", None))
class Ui_MainWindowWithDock(object):
def setupUi(self, MainWindowWithDock):
MainWindowWithDock.setObjectName(_fromUtf8("MainWindowWithDock"))
MainWindowWithDock.resize(509, 316)
self.centralwidget = QtGui.QWidget(MainWindowWithDock)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
MainWindowWithDock.setCentralWidget(self.centralwidget)
# # # # # # # # # # # # # # # # # # # # # #
# # # setup dock # # # # # # # # #
# # # # # # # # # # # # # # # # # # # # # #
self.theDock = QtGui.QDockWidget(MainWindowWithDock)
self.theDock.setObjectName(_fromUtf8("theDock"))
self.dockWidgetContents = QtGui.QWidget(self.theDock)
self.dockWidgetContents.setObjectName(_fromUtf8("dockWidgetContents"))
self.theDock.setWidget(self.dockWidgetContents)
MainWindowWithDock.addDockWidget(QtCore.Qt.DockWidgetArea(2), self.theDock)
self.retranslateUi(MainWindowWithDock)
QtCore.QMetaObject.connectSlotsByName(MainWindowWithDock)
def retranslateUi(self, MainWindowWithDock):
MainWindowWithDock.setWindowTitle(_translate("MainWindowWithDock", "MainWindow", None))
class MainWindowWithButtonDlg(QMainWindow):
pass
class MainWindowWithDockDlg(QMainWindow):
pass
def main():
app = QApplication(sys.argv)
windowWithDockUi = Ui_MainWindowWithDock()
windowWithDock = MainWindowWithDockDlg()
windowWithDockUi.setupUi(windowWithDock)
windowWithDock.show()
app.exec()
# the dock widget should be closed by now
ui = Ui_MainWindowWithButton()
window = MainWindowWithButtonDlg()
ui.setupUi(window)
window.show()
app.exec()
if __name__ == '__main__':
main()
原始Source的reject方法。这里我们有一个带有 QMainwindow 的 QDialog，因为它是中央 Widget - 因此它在某种意义上变成了 QMainWindow(from Anki addCards.py (scroll to bottom):
def reject(self):
if not self.canClose(): # this way of calling is basically the problem: we might leave this method without doing anything
return
remHook('reset', self.onReset)
remHook('currentModelChanged', self.onModelChange)
clearAudioQueue()
self.removeTempNote(self.editor.note)
self.editor.setNote(None)
self.modelChooser.cleanup()
self.deckChooser.cleanup()
self.mw.maybeReset()
saveGeom(self, "add")
aqt.dialogs.close("AddCards")
QDialog.reject(self)
您可以使用 event-filter to monitor all the events of a given window. Just before a window closes, it will always post a close-event. It doesn't matter whether the window has modified the normal closing process or not. If and when it eventually closes, the accept property 相应的关闭事件 保证 为 True。所以，如果您关注这个事件，您可以简单地检查它是否被接受，然后采取相应的行动。
主要要解决的问题是如何找到合适的window观看。在创建停靠小部件时，这可能无法访问。因此，一种方法是等到停靠小部件的父级首次显示，然后查找顶级 window 并在其上安装事件过滤器。以这种方式做事意味着 dock-widget 永远不需要知道它最终依赖的 window 的任何信息。
下面是基于您的示例的此方法的工作演示（删除了大部分不相关的内容）：
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.QtGui import QApplication, QDialog, QMainWindow
class EventWatcher(QtCore.QObject):
def __init__(self, parent):
QtCore.QObject.__init__(self, parent)
parent.installEventFilter(self)
def eventFilter(self, source, event):
if source is self.parent():
if event.type() == QtCore.QEvent.Show:
target = source.parent()
while target.parent() is not None:
target = target.parent()
print('found target window: %r' % target)
source.removeEventFilter(self)
target.installEventFilter(self)
elif event.type() == QtCore.QEvent.Close:
source.closeEvent(event)
print('test filter accepted: %s' % event.isAccepted())
if event.isAccepted():
self.parent().close()
return True
return QtCore.QObject.eventFilter(self, source, event)
class Ui_MainWindowWithDock(object):
def setupUi(self, MainWindowWithDock):
self.theDock = QtGui.QDockWidget(MainWindowWithDock)
MainWindowWithDock.addDockWidget(QtCore.Qt.DockWidgetArea(2), self.theDock)
# add the event watcher
EventWatcher(self.theDock)
class MainWindowWithDockDlg(QMainWindow):
pass
# mock-up class for testing
class MockDialog(QDialog):
def __init__(self):
QDialog.__init__(self)
windowWithDock = MainWindowWithDockDlg()
windowWithDockUi = Ui_MainWindowWithDock()
windowWithDockUi.setupUi(windowWithDock)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(windowWithDock)
self.canClose = False
def reject(self):
if not self.canClose:
self.canClose = True
return
QDialog.reject(self)
def closeEvent(self, event):
QDialog.closeEvent(self, event)
print('test close accepted: %s' % event.isAccepted())
def main():
app = QApplication(sys.argv)
dialog = MockDialog()
dialog.show()
app.exec_()
# the dock widget should be closed by now
window = QMainWindow()
window.show()
app.exec_()
if __name__ == '__main__':
main()
我有两个打开的 MainWindows：MainWindowWithButton 和 MainWindowWithDock。后者包含一个 QDockWidget。
IS 行为：当用户使 DockWidget 可浮动并关闭 MainWindowWithDock 时，dockWidget 不会关闭。
应该行为：当用户使 DockWidget 可浮动并关闭 MainWindowWithDock 时，dockWidget 也会关闭。
备注：
- "IS behaviour" 的原因：浮动的 DockWidget 似乎独立于它的父级
- 我无法监听 onClose / reject（因为在我的特殊情况下它会提供错误信息。
- MainWindow 没有发出关于其行为的明确信号
- 重要的是，DockWidget 在 MainWindow 关闭之前关闭。否则焦点会意外
示例代码：
from PyQt4 import QtCore, QtGui
from PyQt4 import QtCore, QtGui
from PyQt4.QtGui import QApplication, QDialog, QMainWindow
import sys
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindowWithButton(object):
def setupUi(self, MainWindowWithButton):
MainWindowWithButton.setObjectName(_fromUtf8("MainWindowWithButton"))
MainWindowWithButton.resize(567, 384)
self.centralwidget = QtGui.QWidget(MainWindowWithButton)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
MainWindowWithButton.setCentralWidget(self.centralwidget)
def retranslateUi(self, MainWindowWithButton):
MainWindowWithButton.setWindowTitle(_translate("MainWindowWithButton", "MainWindow", None))
class Ui_MainWindowWithDock(object):
def setupUi(self, MainWindowWithDock):
MainWindowWithDock.setObjectName(_fromUtf8("MainWindowWithDock"))
MainWindowWithDock.resize(509, 316)
self.centralwidget = QtGui.QWidget(MainWindowWithDock)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
MainWindowWithDock.setCentralWidget(self.centralwidget)
# # # # # # # # # # # # # # # # # # # # # #
# # # setup dock # # # # # # # # #
# # # # # # # # # # # # # # # # # # # # # #
self.theDock = QtGui.QDockWidget(MainWindowWithDock)
self.theDock.setObjectName(_fromUtf8("theDock"))
self.dockWidgetContents = QtGui.QWidget(self.theDock)
self.dockWidgetContents.setObjectName(_fromUtf8("dockWidgetContents"))
self.theDock.setWidget(self.dockWidgetContents)
MainWindowWithDock.addDockWidget(QtCore.Qt.DockWidgetArea(2), self.theDock)
self.retranslateUi(MainWindowWithDock)
QtCore.QMetaObject.connectSlotsByName(MainWindowWithDock)
def retranslateUi(self, MainWindowWithDock):
MainWindowWithDock.setWindowTitle(_translate("MainWindowWithDock", "MainWindow", None))
class MainWindowWithButtonDlg(QMainWindow):
pass
class MainWindowWithDockDlg(QMainWindow):
pass
def main():
app = QApplication(sys.argv)
windowWithDockUi = Ui_MainWindowWithDock()
windowWithDock = MainWindowWithDockDlg()
windowWithDockUi.setupUi(windowWithDock)
windowWithDock.show()
app.exec()
# the dock widget should be closed by now
ui = Ui_MainWindowWithButton()
window = MainWindowWithButtonDlg()
ui.setupUi(window)
window.show()
app.exec()
if __name__ == '__main__':
main()
原始Source的reject方法。这里我们有一个带有 QMainwindow 的 QDialog，因为它是中央 Widget - 因此它在某种意义上变成了 QMainWindow(from Anki addCards.py (scroll to bottom):
def reject(self):
if not self.canClose(): # this way of calling is basically the problem: we might leave this method without doing anything
return
remHook('reset', self.onReset)
remHook('currentModelChanged', self.onModelChange)
clearAudioQueue()
self.removeTempNote(self.editor.note)
self.editor.setNote(None)
self.modelChooser.cleanup()
self.deckChooser.cleanup()
self.mw.maybeReset()
saveGeom(self, "add")
aqt.dialogs.close("AddCards")
QDialog.reject(self)
您可以使用 event-filter to monitor all the events of a given window. Just before a window closes, it will always post a close-event. It doesn't matter whether the window has modified the normal closing process or not. If and when it eventually closes, the accept property 相应的关闭事件 保证 为 True。所以，如果您关注这个事件，您可以简单地检查它是否被接受，然后采取相应的行动。
主要要解决的问题是如何找到合适的window观看。在创建停靠小部件时，这可能无法访问。因此，一种方法是等到停靠小部件的父级首次显示，然后查找顶级 window 并在其上安装事件过滤器。以这种方式做事意味着 dock-widget 永远不需要知道它最终依赖的 window 的任何信息。
下面是基于您的示例的此方法的工作演示（删除了大部分不相关的内容）：
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.QtGui import QApplication, QDialog, QMainWindow
class EventWatcher(QtCore.QObject):
def __init__(self, parent):
QtCore.QObject.__init__(self, parent)
parent.installEventFilter(self)
def eventFilter(self, source, event):
if source is self.parent():
if event.type() == QtCore.QEvent.Show:
target = source.parent()
while target.parent() is not None:
target = target.parent()
print('found target window: %r' % target)
source.removeEventFilter(self)
target.installEventFilter(self)
elif event.type() == QtCore.QEvent.Close:
source.closeEvent(event)
print('test filter accepted: %s' % event.isAccepted())
if event.isAccepted():
self.parent().close()
return True
return QtCore.QObject.eventFilter(self, source, event)
class Ui_MainWindowWithDock(object):
def setupUi(self, MainWindowWithDock):
self.theDock = QtGui.QDockWidget(MainWindowWithDock)
MainWindowWithDock.addDockWidget(QtCore.Qt.DockWidgetArea(2), self.theDock)
# add the event watcher
EventWatcher(self.theDock)
class MainWindowWithDockDlg(QMainWindow):
pass
# mock-up class for testing
class MockDialog(QDialog):
def __init__(self):
QDialog.__init__(self)
windowWithDock = MainWindowWithDockDlg()
windowWithDockUi = Ui_MainWindowWithDock()
windowWithDockUi.setupUi(windowWithDock)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(windowWithDock)
self.canClose = False
def reject(self):
if not self.canClose:
self.canClose = True
return
QDialog.reject(self)
def closeEvent(self, event):
QDialog.closeEvent(self, event)
print('test close accepted: %s' % event.isAccepted())
def main():
app = QApplication(sys.argv)
dialog = MockDialog()
dialog.show()
app.exec_()
# the dock widget should be closed by now
window = QMainWindow()
window.show()
app.exec_()
if __name__ == '__main__':
main()