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"""
Copyright 2007 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
from Constants import BLOCK_SELECTION_WINDOW_WIDTH
import pygtk
pygtk.require('2.0')
import gtk
import gobject
NAME_INDEX = 0
KEY_INDEX = 1
class BlockTreeWindow(gtk.VBox):
"""The block selection panel."""
def __init__(self, platform, get_flow_graph):
"""
BlockTreeWindow constructor.
Create a tree view of the possible blocks in the platform.
The tree view nodes will be category names, the leaves will be block names.
A mouse double click or button press action will trigger the add block event.
@param platform the particular platform will all block prototypes
@param get_flow_graph get the selected flow graph
"""
gtk.VBox.__init__(self)
self.platform = platform
self.get_flow_graph = get_flow_graph
#make the tree model for holding blocks
self.treestore = gtk.TreeStore(gobject.TYPE_STRING, gobject.TYPE_STRING)
self.treeview = gtk.TreeView(self.treestore)
self.treeview.set_enable_search(False) #disable pop up search box
self.treeview.add_events(gtk.gdk.BUTTON_PRESS_MASK)
self.treeview.connect('button_press_event', self._handle_mouse_button_press)
selection = self.treeview.get_selection()
selection.set_mode('single')
selection.connect('changed', self._handle_selection_change)
renderer = gtk.CellRendererText()
column = gtk.TreeViewColumn('Blocks', renderer, text=NAME_INDEX)
self.treeview.append_column(column)
#make the scrolled window to hold the tree view
scrolled_window = gtk.ScrolledWindow()
scrolled_window.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
scrolled_window.add_with_viewport(self.treeview)
scrolled_window.set_size_request(BLOCK_SELECTION_WINDOW_WIDTH, -1)
self.pack_start(scrolled_window)
#add button
self.add_button = gtk.Button(None, 'gtk-add')
self.add_button.connect('clicked', self._handle_add_button)
self.pack_start(self.add_button, False)
#map categories to iters
self.categories = dict()
self.categories[tuple()] = None
#add blocks and categories
self.platform.load_block_tree(self)
#initialize
self._update_add_button()
############################################################
## Block Tree Methods
############################################################
def add_block(self, category, block=None):
"""
Add a block with category to this selection window.
Add only the category when block is None.
@param category the category string
@param block the block object or None
"""
#rectify category
category = filter(lambda x: x, category.split('/'))
#add category and all sub categories
for i in range(len(category)):
sub_category = tuple(category[:i+1])
if sub_category not in self.categories.keys():
iter = self.treestore.insert_before(self.categories[tuple(category[:i])], None)
self.treestore.set_value(iter, NAME_INDEX, '[ %s ]'%category[i])
self.treestore.set_value(iter, KEY_INDEX, '')
self.categories[sub_category] = iter
#add block
if block is None: return
iter = self.treestore.insert_before(self.categories[tuple(category)], None)
self.treestore.set_value(iter, NAME_INDEX, block.get_name())
self.treestore.set_value(iter, KEY_INDEX, block.get_key())
############################################################
## Helper Methods
############################################################
def _get_selected_block_key(self):
"""
Get the currently selected block key.
@return the key of the selected block or a empty string
"""
selection = self.treeview.get_selection()
treestore, iter = selection.get_selected()
return iter and treestore.get_value(iter, KEY_INDEX) or ''
def _update_add_button(self):
"""
Update the add button's sensitivity.
The button should be active only if a block is selected.
"""
key = self._get_selected_block_key()
self.add_button.set_sensitive(bool(key))
def _add_selected_block(self):
"""
Add the selected block with the given key to the flow graph.
"""
key = self._get_selected_block_key()
if key: self.get_flow_graph().add_new_block(key)
############################################################
## Event Handlers
############################################################
def _handle_mouse_button_press(self, widget, event):
"""
Handle the mouse button press.
If a left double click is detected, call add selected block.
"""
if event.button == 1 and event.type == gtk.gdk._2BUTTON_PRESS:
self._add_selected_block()
def _handle_selection_change(self, selection):
"""
Handle a selection change in the tree view.
If a selection changes, set the add button sensitive.
"""
self._update_add_button()
def _handle_add_button(self, widget):
"""
Handle the add button clicked signal.
Call add selected block.
"""
self._add_selected_block()
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