class QtMenuBar(QtToolkitObject, ProxyMenuBar):
""" A Qt implementation of an Enaml ProxyMenuBar.
"""
#: A reference to the widget created by the proxy.
widget = Typed(QMenuBar)
#--------------------------------------------------------------------------
# Initialization API
#--------------------------------------------------------------------------
def create_widget(self):
""" Create the underlying menu bar widget.
"""
# Qt behaves better when creating the menu bar without a parent.
self.widget = QMenuBar()
def init_layout(self):
""" Initialize the layout for the menu bar.
"""
super(QtMenuBar, self).init_layout()
widget = self.widget
for child in self.children():
if isinstance(child, QtMenu):
widget.addMenu(child.widget)
def destroy(self):
""" A reimplemented destructor.
Qt takes ownership of the menubar, so the destructor does not
attempt to unparent the menubar. The child_removed handler on
the main window will reset the menu bar.
"""
del self.declaration
#--------------------------------------------------------------------------
# Child Events
#--------------------------------------------------------------------------
def find_next_action(self, child):
""" Get the QAction instance which follows the child.
Parameters
----------
child : QtMenu
The child menu of interest.
Returns
-------
result : QAction or None
The QAction which comes immediately after the actions of the
given child, or None if no actions follow the child.
"""
found = False
for dchild in self.children():
if found:
if isinstance(dchild, QtMenu):
return dchild.widget.menuAction()
else:
found = dchild is child
def child_added(self, child):
""" Handle the child added event for a QtMenuBar.
"""
super(QtMenuBar, self).child_added(child)
if isinstance(child, QtMenu):
before = self.find_next_action(child)
self.widget.insertMenu(before, child.widget)
def child_removed(self, child):
""" Handle the child removed event for a QtMenuBar.
"""
super(QtMenuBar, self).child_removed(child)
if isinstance(child, QtMenu):
self.widget.removeAction(child.widget.menuAction())
