/usr/share/pyshared/jarabe/desktop/grid.py is in python-jarabe-0.96 0.96.1-2.1git1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | # Copyright (C) 2007 Red Hat, Inc.
# Copyright (C) 2008 One Laptop Per Child
#
# 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 random
import gobject
import gtk
from sugar import _sugarext
_PLACE_TRIALS = 20
_MAX_WEIGHT = 255
_REFRESH_RATE = 200
_MAX_COLLISIONS_PER_REFRESH = 20
class Grid(_sugarext.Grid):
__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._child_rects = {}
self._locked_children = set()
self._collisions = []
self._collisions_sid = 0
self.setup(self.width, self.height)
def add(self, child, width, height, x=None, y=None, locked=False):
if x is not None and y is not None:
rect = gtk.gdk.Rectangle(x, y, width, height)
weight = self.compute_weight(rect)
else:
trials = _PLACE_TRIALS
weight = _MAX_WEIGHT
while trials > 0 and weight:
x = int(random.random() * (self.width - width))
y = int(random.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
self._child_rects[child] = rect
self._children.append(child)
self.add_weight(self._child_rects[child])
if locked:
self._locked_children.add(child)
if weight > 0:
self._detect_collisions(child)
def remove(self, child):
self._children.remove(child)
self.remove_weight(self._child_rects[child])
self._locked_children.discard(child)
del self._child_rects[child]
if child in self._collisions:
self._collisions.remove(child)
def move(self, child, x, y, locked=False):
self.remove_weight(self._child_rects[child])
rect = self._child_rects[child]
rect.x = x
rect.y = y
weight = self.compute_weight(rect)
self.add_weight(self._child_rects[child])
if locked:
self._locked_children.add(child)
else:
self._locked_children.discard(child)
if weight > 0:
self._detect_collisions(child)
def _shift_child(self, child, weight):
rect = self._child_rects[child]
new_rects = []
# Get rects right, left, bottom and top
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))
# Get diagonal rects
if rect.x + rect.width < self.width - 1 and \
rect.y + rect.height < self.height - 1:
new_rects.append(gtk.gdk.Rectangle(rect.x + 1, rect.y + 1,
rect.width, rect.height))
if rect.x - 1 > 0 and rect.y + rect.height < self.height - 1:
new_rects.append(gtk.gdk.Rectangle(rect.x - 1, rect.y + 1,
rect.width, rect.height))
if rect.x + rect.width < self.width - 1 and rect.y - 1 > 0:
new_rects.append(gtk.gdk.Rectangle(rect.x + 1, rect.y - 1,
rect.width, rect.height))
if rect.x - 1 > 0 and rect.y - 1 > 0:
new_rects.append(gtk.gdk.Rectangle(rect.x - 1, rect.y - 1,
rect.width, rect.height))
random.shuffle(new_rects)
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._child_rects[child] = best_rect
weight = self._shift_child(child, weight)
return weight
def __solve_collisions_cb(self):
for i_ in range(_MAX_COLLISIONS_PER_REFRESH):
collision = self._collisions.pop(0)
old_rect = self._child_rects[collision]
self.remove_weight(old_rect)
weight = self.compute_weight(old_rect)
weight = self._shift_child(collision, weight)
self.add_weight(self._child_rects[collision])
# TODO: we shouldn't give up the first time we failed to find a
# better position.
if old_rect != self._child_rects[collision]:
self._detect_collisions(collision)
self.emit('child-changed', collision)
if weight > 0:
self._collisions.append(collision)
if not self._collisions:
self._collisions_sid = 0
return False
return True
def _detect_collisions(self, child):
collision_found = False
child_rect = self._child_rects[child]
for c in self._children:
intersection = child_rect.intersect(self._child_rects[c])
if c != child and intersection.width > 0:
if (c not in self._locked_children and
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 self._collisions and not self._collisions_sid:
self._collisions_sid = gobject.timeout_add(_REFRESH_RATE,
self.__solve_collisions_cb, priority=gobject.PRIORITY_LOW)
def get_child_rect(self, child):
return self._child_rects[child]
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