path: root/view.py

# Copyright (C) 2009, Tomeu Vizoso
#
# This program 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.
#
# This program 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 St, Fifth Floor, Boston, MA  02110-1301  USA

import logging
from gettext import gettext as _

import gobject
import gtk
from gaphas import GtkView, Canvas, Line, geometry
from gaphas import tool

# We'd rather not depend on sugar in this class
from sugar.graphics import style

from thoughtview import ThoughtView

class MindMapView(GtkView):

    __gtype_name__ = 'MindMapView'

    def __init__(self, model=None):
        self._model = None
        self._row_changed_sid = None
        self._row_deleted_sid = None

        GtkView.__init__(self)

        self.canvas = Canvas()

        self.tool = tool.ToolChain().               \
                    append(NewThoughtTool()).       \
                    append(tool.HoverTool()).       \
                    append(ItemTool()).             \
                    append(tool.TextEditTool()).    \
                    append(tool.RubberbandTool())

        if model is not None:
            self.model = model

    def set_model(self, new_model):
        logging.debug('set_model %r' % new_model)
        if self._model == new_model:
            return

        if self._model is not None:
            self._model.disconnect(self._row_changed_sid)
            self._model.disconnect(self._row_deleted_sid)
            
        self._model = new_model

        if self._model is not None:
            self._row_changed_sid = \
                    self._model.connect('row-changed', self.__row_changed_cb)
            self._row_deleted_sid = \
                    self._model.connect('row-deleted', self.__row_deleted_cb)

            for item in self.canvas.get_all_items():
                self.canvas.remove(item)
            self._populate_from_model(self._model)

    def _populate_from_model(self, rows):
        for row in rows:
            thought_view = ThoughtView(row[0], row[1], row[2], row[3], row[4])
            self._populate_from_model(row.iterchildren())
            self.add_element(thought_view)

    def get_model(self):
        return self._model

    model = property(get_model, set_model)

    def _calculate_ports(self, child_view, parent_view):
        child_rect = child_view.get_rectangle()
        parent_rect = parent_view.get_rectangle()

        point_in_child = self._get_closest_intersection(child_rect, parent_rect)
        point_in_parent = self._get_closest_intersection(parent_rect, child_rect)

        return point_in_child, point_in_parent

    def _get_closest_intersection(self, rect1, rect2):
        center1 = rect1.x + rect1.width / 2, rect1.y + rect1.height / 2
        center2 = rect2.x + rect2.width / 2, rect2.y + rect2.height / 2

        return self._intersection_rect_line(rect1, (center1, center2))

    def _intersection_rect_line(self, rect, line):
        top_edge = (rect.x, rect.y), (rect.x + rect.width, rect.y)
        left_edge = (rect.x, rect.y), (rect.x, rect.y + rect.height)
        bottom_edge = (rect.x, rect.y + rect.height), \
                      (rect.x + rect.width, rect.y + rect.height)
        right_edge = (rect.x + rect.width, rect.y + rect.height), \
                     (rect.x + rect.width, rect.y)

        for edge in (top_edge, left_edge, bottom_edge, right_edge):
            point = geometry.intersect_line_line(line[0], line[1],
                                                 edge[0], edge[1])
            if point is not None:
                return point

        raise ValueError('Rect %r and line %r dont intersect!' % (rect, line,))

    def _update_connection(self, parent_view, thought_view):
        handle_tool = tool.ConnectHandleTool()

        if thought_view.line_to_parent is None:
            line = Line()
            self.canvas.add(line)
            thought_view.line_to_parent = line
        else:
            line = thought_view.line_to_parent
            line_handle = line.handles()[0]
            handle_tool.disconnect(self, line, line_handle)
            handle_tool.disconnect(self, line, line.opposite(line_handle))

        start, end = self._calculate_ports(thought_view, parent_view)

        line_handle = line.handles()[0]
        handle_tool.connect(self, line, line_handle, start)
        handle_tool.connect(self, line, line.opposite(line_handle), end)

        self.canvas.request_update(line)

    def __row_changed_cb(self, model, path, iter):
        row = model[iter]
        #logging.debug('__row_changed_cb %r' % ((row[0], row[1], row[2], row[3], row[4],),))

        thought_view = self._get_thought_by_id(row[0])
        if thought_view is None:
            thought_view = ThoughtView(row[0], row[1], row[2], row[3], row[4])
            self.canvas.add(thought_view)
        else:
            thought_view.name = row[1]
            thought_view.set_position(row[2], row[3])
            thought_view.color = row[4]

        gobject.idle_add(self.__update_connections_cb, thought_view, row)

    def __update_connections_cb(self, thought_view, row):
        if row.parent is not None:
            parent_view = self._get_thought_by_id(row.parent[0])
            self._update_connection(parent_view, thought_view)

        for child in row.iterchildren():
            child_view = self._get_thought_by_id(child[0])
            self._update_connection(thought_view, child_view)

    def __row_deleted_cb(self, model, path):
        logging.debug('__row_deleted_cb %r' % path)

        raise NotImplementedError()
        thought_view = self._get_thought_by_id(path[0])
        self.remove_element(thought_view)

    def _get_thought_by_id(self, thought_id):
        for item in self.canvas.get_all_items():
            if isinstance(item, ThoughtView) and item.id == thought_id:
                return item
        return None

class NewThoughtTool(tool.HandleTool):

    def __init__(self):
        tool.HandleTool.__init__(self)
        self._new_connection = None
        self._parent_thought = None

    def grab_handle(self, item, handle):
        logging.debug('NewThoughtTool.grab_handle %r %r' % (item, handle))
        tool.HandleTool.grab_handle(self, item, handle)

    def ungrab_handle(self):
        logging.debug('NewThoughtTool.ungrab_handle')
        tool.HandleTool.ungrab_handle(self)

    def on_button_release(self, context, event):
        logging.debug('NewThoughtTool.on_button_release')

        if self._new_connection is not None:
            context.view.canvas.remove(self._new_connection)
            self._new_connection = None

            context.view.model.create_new_thought(x=event.x, y=event.y,
                                                  parent_id=self._parent_thought.id)

        tool.HandleTool.on_button_release(self, context, event)

    def move(self, view, item, handle, pos):
        #logging.debug('NewThoughtTool.move')
        if isinstance(item, ThoughtView) and handle == item.new_thought_handle:
            matrix = view.canvas.get_matrix_i2c(item)
            offset = matrix[4], matrix[5]

            if self._new_connection is None:
                self._new_connection = Line()
                view.canvas.add(self._new_connection)
                start_handle = self._new_connection.handles()[0]
                start_handle.x = item.handles()[4].pos[0] + offset[0]
                start_handle.y = item.handles()[4].pos[1] + offset[1]
                #logging.debug('created line starting at %r %r' % item.handles()[4].pos)

                self._parent_thought = item

            end_handle = self._new_connection.handles()[1]
            end_handle.x = pos[0]
            end_handle.y = pos[1]
            view.canvas.request_update(self._new_connection)
            #logging.debug('moved line end to %r %r' % (end_handle.x, end_handle.y))
        else:
            tool.HandleTool.move(self, view, item, handle, pos)

    def glue(self, view, item, handle, vpos):
        #logging.debug('NewThoughtTool.glue')
        tool.HandleTool.glue(self, view, item, handle, vpos)

    def connect(self, view, item, handle, vpos):
        logging.debug('NewThoughtTool.connect')
        tool.HandleTool.connect(self, view, item, handle, vpos)

    def disconnect(self, view, item, handle):
        logging.debug('NewThoughtTool.disconnect')
        tool.HandleTool.disconnect(self, view, item, handle)

class ItemTool(tool.ItemTool):

    def __init__(self):
        tool.ItemTool.__init__(self)

    def on_button_release(self, context, event):
        logging.debug('ItemTool.on_button_release')

        for item in self._movable_items:
            if not isinstance(item, ThoughtView):
                continue
            x, y = item.get_position()
            row = context.view.model.find_by_id(item.id)
            if row[2] != x or row[3] != y:
                context.view.model.set(row.iter, 2, x, 3, y)

        tool.ItemTool.on_button_release(self, context, event)