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menu_manager.py
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menu_manager.py
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#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
""" The PyQt specific implementation of a menu manager. """
# Major package imports.
from enthought.qt import QtCore, QtGui
# Enthought library imports.
from enthought.traits.api import Unicode
# Local imports.
from enthought.pyface.action.action_manager import ActionManager
from enthought.pyface.action.action_manager_item import ActionManagerItem
from enthought.pyface.action.group import Group
class MenuManager(ActionManager, ActionManagerItem):
""" A menu manager realizes itself in a menu control.
This could be a sub-menu or a context (popup) menu.
"""
#### 'MenuManager' interface ##############################################
# The menu manager's name (if the manager is a sub-menu, this is what its
# label will be).
name = Unicode
###########################################################################
# 'MenuManager' interface.
###########################################################################
def create_menu(self, parent, controller=None):
""" Creates a menu representation of the manager. """
# If a controller is required it can either be set as a trait on the
# menu manager (the trait is part of the 'ActionManager' API), or
# passed in here (if one is passed in here it takes precedence over the
# trait).
if controller is None:
controller = self.controller
return _Menu(self, parent, controller)
###########################################################################
# 'ActionManagerItem' interface.
###########################################################################
def add_to_menu(self, parent, menu, controller):
""" Adds the item to a menu. """
submenu = self.create_menu(parent, controller)
submenu.menuAction().setText(self.name)
menu.addMenu(submenu)
def add_to_toolbar(self, parent, tool_bar, image_cache, controller):
""" Adds the item to a tool bar. """
raise ValueError("Cannot add a menu manager to a toolbar.")
class _Menu(QtGui.QMenu):
""" The toolkit-specific menu control. """
###########################################################################
# 'object' interface.
###########################################################################
def __init__(self, manager, parent, controller):
""" Creates a new tree. """
# Base class constructor.
QtGui.QMenu.__init__(self, parent)
# The parent of the menu.
self._parent = parent
# The manager that the menu is a view of.
self._manager = manager
# The controller.
self._controller = controller
# List of menu items
self.menu_items = []
# Create the menu structure.
self.refresh()
# Listen to the manager being updated.
self._manager.on_trait_change(self.refresh, 'changed')
self._manager.on_trait_change(self._on_enabled_changed, 'enabled')
return
###########################################################################
# '_Menu' interface.
###########################################################################
def clear(self):
""" Clears the items from the menu. """
for item in self.menu_items:
item.dispose()
self.menu_items = []
super(_Menu, self).clear()
def is_empty(self):
""" Is the menu empty? """
return self.isEmpty()
def refresh(self):
""" Ensures that the menu reflects the state of the manager. """
self.clear()
manager = self._manager
parent = self._parent
previous_non_empty_group = None
for group in manager.groups:
previous_non_empty_group = self._add_group(parent, group,
previous_non_empty_group)
def show(self, x=None, y=None):
""" Show the menu at the specified location. """
if x is None or y is None:
point = QtGui.QCursor.pos()
else:
point = QtCore.QPoint(x, y)
self.popup(point)
###########################################################################
# Private interface.
###########################################################################
def _on_enabled_changed(self, obj, trait_name, old, new):
""" Dynamic trait change handler. """
self.setEnabled(new)
return
def _add_group(self, parent, group, previous_non_empty_group=None):
""" Adds a group to a menu. """
if len(group.items) > 0:
# Is a separator required?
if previous_non_empty_group is not None and group.separator:
self.addSeparator()
# Create actions and sub-menus for each contribution item in
# the group.
for item in group.items:
if isinstance(item, Group):
if len(item.items) > 0:
self._add_group(parent, item, previous_non_empty_group)
if previous_non_empty_group is not None \
and previous_non_empty_group.separator \
and item.separator:
self.addSeparator()
previous_non_empty_group = item
else:
item.add_to_menu(parent, self, self._controller)
previous_non_empty_group = group
return previous_non_empty_group
#### EOF ######################################################################