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# Copyright (C) 2007 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
from numpy import array
from random import random
import hippo
import gobject
import gtk
_PLACE_TRIALS = 20
_MAX_WEIGHT = 255
_CELL_SIZE = 4
class _Grid(gobject.GObject):
__gsignals__ = {
'child-changed' : (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT]))
}
def __init__(self, width, height):
gobject.GObject.__init__(self)
self.width = width
self.height = height
self._children = []
self._collisions = []
self._collisions_sid = 0
self._array = array([0], dtype='b')
self._array.resize(width * height)
def add(self, child, width, height):
trials = _PLACE_TRIALS
weight = _MAX_WEIGHT
while trials > 0 and weight:
x = int(random() * (self.width - width))
y = int(random() * (self.height - height))
rect = gtk.gdk.Rectangle(x, y, width, height)
new_weight = self._compute_weight(rect)
if weight > new_weight:
weight = new_weight
trials -= 1
child.grid_rect = rect
child.locked = False
self._add_child(child)
if weight > 0:
self._detect_collisions(child)
def remove(self, child):
self._children.remove(child)
self._remove_weight(child.grid_rect)
child.grid_rect = None
def _add_child(self, child):
self._children.append(child)
self.add_weight(child.grid_rect)
def _move_child(self, child, new_rect):
self._remove_weight(child.grid_rect)
self.add_weight(new_rect)
child.grid_rect = new_rect
self.emit('child-changed', child)
def _shift_child(self, child):
rect = child.grid_rect
weight = self._compute_weight(rect)
new_rects = []
if (rect.x + rect.width < self.width - 1):
new_rects.append(gtk.gdk.Rectangle(rect.x + 1, rect.y,
rect.width, rect.height))
if (rect.x - 1 > 0):
new_rects.append(gtk.gdk.Rectangle(rect.x - 1, rect.y,
rect.width, rect.height))
if (rect.y + rect.height < self.height - 1):
new_rects.append(gtk.gdk.Rectangle(rect.x, rect.y + 1,
rect.width, rect.height))
if (rect.y - 1 > 0):
new_rects.append(gtk.gdk.Rectangle(rect.x, rect.y - 1,
rect.width, rect.height))
best_rect = None
for new_rect in new_rects:
new_weight = self._compute_weight(new_rect)
if new_weight < weight:
best_rect = new_rect
weight = new_weight
if best_rect:
self._move_child(child, best_rect)
return weight
def _solve_collisions(self):
for collision in self._collisions[:]:
weight = self._shift_child(collision)
if not weight:
self._collisions.remove(collision)
return (len(self._collisions) > 0)
def _detect_collisions(self, child):
collision_found = False
for c in self._children:
intersection = child.grid_rect.intersect(c.grid_rect)
if c != child and intersection.width > 0:
if c not in self._collisions:
collision_found = True
self._collisions.append(c)
if collision_found:
if child not in self._collisions:
self._collisions.append(child)
# if len(self._collisions) and not self._collisions_sid:
# self._collisions_sid = gobject.idle_add(self._solve_collisions)
def add_weight(self, rect):
for i in range(rect.x, rect.x + rect.width):
for j in range(rect.y, rect.y + rect.height):
self[j, i] += 1
def _remove_weight(self, rect):
for i in range(rect.x, rect.x + rect.width):
for j in range(rect.y, rect.y + rect.height):
self[j, i] -= 1
def _compute_weight(self, rect):
weight = 0
for i in range(rect.x, rect.x + rect.width):
for j in range(rect.y, rect.y + rect.height):
weight += self[j, i]
return weight
def __getitem__(self, (row, col)):
return self._array[col + row * self.width]
def __setitem__(self, (row, col), value):
self._array[col + row * self.width] = value
class SpreadLayout(gobject.GObject,hippo.CanvasLayout):
__gtype_name__ = 'SugarSpreadLayout'
def __init__(self):
gobject.GObject.__init__(self)
min_width, width = self.do_get_width_request()
min_height, height = self.do_get_height_request(width)
self._grid = _Grid(width / _CELL_SIZE, height / _CELL_SIZE)
self._grid.connect('child-changed', self._grid_child_changed_cb)
def add_center(self, child):
self._box.append(child)
width, height = self._get_child_grid_size(child)
rect = gtk.gdk.Rectangle(int((self._grid.width - width) / 2),
int((self._grid.height - height) / 2),
width + 1, height + 1)
self._grid.add_weight(rect)
box_child = self._box.find_box_child(child)
box_child.grid_rect = None
def add(self, child):
self._box.append(child)
width, height = self._get_child_grid_size(child)
box_child = self._box.find_box_child(child)
self._grid.add(box_child, width, height)
def remove(self, child):
box_child = self._box.find_box_child(child)
self._grid.remove(box_child)
self._box.remove(child)
def do_set_box(self, box):
self._box = box
def do_get_height_request(self, for_width):
return 0, gtk.gdk.screen_height()
def do_get_width_request(self):
return 0, gtk.gdk.screen_width()
def do_allocate(self, x, y, width, height,
req_width, req_height, origin_changed):
for child in self._box.get_layout_children():
rect = child.grid_rect
if child.grid_rect:
child.allocate(rect.x * _CELL_SIZE,
rect.y * _CELL_SIZE,
rect.width * _CELL_SIZE,
rect.height * _CELL_SIZE,
origin_changed)
else:
min_w, child_width = child.get_width_request()
min_h, child_height = child.get_height_request(child_width)
child.allocate(x + (width - child_width) / 2,
y + (height - child_height) / 2,
child_width, child_height, origin_changed)
def _get_child_grid_size(self, child):
min_width, width = child.get_width_request()
min_height, height = child.get_height_request(width)
return int(width / _CELL_SIZE), int(height / _CELL_SIZE)
def _grid_child_changed_cb(self, grid, box_child):
box_child.item.emit_request_changed()
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