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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
# Author: Enthought, Inc.
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
""" A tree control with extensible node types. """
# Standard library imports.
import inspect
# Enthought library imports.
from enthought.pyface.action.api import ActionEvent
from enthought.traits.api import Instance, List, Property
# Local imports.
from node_manager import NodeManager
from node_type import NodeType
from node_tree_model import NodeTreeModel
from tree import Tree
class NodeTree(Tree):
""" A tree control with extensible node types. """
#### 'Tree' interface #####################################################
# The model that provides the data for the tree.
model = Instance(NodeTreeModel, ())
#### 'NodeTree' interface #################################################
# The node manager looks after all node types.
node_manager = Property(Instance(NodeManager))
# The node types in the tree.
node_types = Property(List(NodeType))
###########################################################################
# 'NodeTree' interface.
###########################################################################
#### Properties ###########################################################
# node_manager
def _get_node_manager(self):
""" Returns the root node of the tree. """
return self.model.node_manager
def _set_node_manager(self, node_manager):
""" Sets the root node of the tree. """
self.model.node_manager = node_manager
return
# node_types
def _get_node_types(self):
""" Returns the node types in the tree. """
return self.model.node_manager.node_types
def _set_node_types(self, node_types):
""" Sets the node types in the tree. """
self.model.node_manager.node_types = node_types
return
###########################################################################
# 'Tree' interface.
###########################################################################
#### Trait event handlers #################################################
def _node_activated_changed(self, obj):
""" Called when a node has been activated (i.e., double-clicked). """
default_action = self.model.get_default_action(obj)
if default_action is not None:
self._perform_default_action(default_action, obj)
return
def _node_right_clicked_changed(self, (obj, point)):
""" Called when the right mouse button is clicked on the tree. """
# Add the node that the right-click occurred on to the selection.
self.select(obj)
# fixme: This is a hack to allow us to attach the node that the
# right-clicked occurred on to the action event.
self._context = obj
# Ask the model for the node's context menu.
menu_manager = self.model.get_context_menu(obj)
if menu_manager is not None:
self._popup_menu(menu_manager, obj, point)
return
###########################################################################
# 'ActionController' interface.
###########################################################################
def add_to_menu(self, menu_item):
""" Adds a menu item to a menu bar. """
pass
def add_to_toolbar(self, toolvar_item):
""" Adds a tool bar item to a tool bar. """
pass
def can_add_to_menu(self, action):
""" Returns True iff an action can be added to the menu. """
return True
def perform(self, action, event):
""" Perform an action. """
# fixme: We need a more formal event structure!
event.widget = self
event.context = self._context
# fixme: the 'perform' method without taking an event is deprecated!
args, varargs, varkw, defaults = inspect.getargspec(action.perform)
# If the only argument is 'self' then this is the DEPRECATED
# interface.
if len(args) == 1:
action.perform()
else:
action.perform(event)
return
###########################################################################
# Private interface.
###########################################################################
def _create_action_event(self, obj):
""" Return a new action event for the specified object. """
return ActionEvent(widget=self, context=obj)
def _perform_default_action(self, action, obj):
""" Perform the default action on the specified object. """
action.perform(self._create_action_event(obj))
return
def _popup_menu(self, menu_manager, obj, point):
""" Popup the menu described by the menu manager. """
# Create the actual menu control.
menu = menu_manager.create_menu(self.control, self)
if not menu.is_empty():
# Show the menu. If an action is selected it will be performed
# *before* this call returns.
menu.show(*point)
# This gives the actions in the menu manager a chance to cleanup
# any event listeners etc.
menu_manager.destroy()
return
#### EOF ######################################################################
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