diff options
author | Julio Reyes <nemesiscodex@gmail.com> | 2013-07-05 14:13:11 (GMT) |
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committer | Julio Reyes <nemesiscodex@gmail.com> | 2013-07-05 14:13:11 (GMT) |
commit | b6db5b8af0af7ebfdd44cb53b09d63b819989338 (patch) | |
tree | ca439018bfa1c34c97bdaed4ec0f20bc36bd678f /src/jarabe/desktop/snowflakelayout.py |
Diffstat (limited to 'src/jarabe/desktop/snowflakelayout.py')
-rw-r--r-- | src/jarabe/desktop/snowflakelayout.py | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/jarabe/desktop/snowflakelayout.py b/src/jarabe/desktop/snowflakelayout.py new file mode 100644 index 0000000..e4963ba --- /dev/null +++ b/src/jarabe/desktop/snowflakelayout.py @@ -0,0 +1,111 @@ +# Copyright (C) 2006-2007 Red Hat, Inc. +# +# 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 math + +import gobject +import hippo + +from sugar.graphics import style + + +_BASE_DISTANCE = style.zoom(25) +_CHILDREN_FACTOR = style.zoom(3) + + +class SnowflakeLayout(gobject.GObject, hippo.CanvasLayout): + __gtype_name__ = 'SugarSnowflakeLayout' + + def __init__(self): + gobject.GObject.__init__(self) + self._nflakes = 0 + self._box = None + + def add(self, child, center=False): + if not center: + self._nflakes += 1 + + self._box.append(child) + + box_child = self._box.find_box_child(child) + box_child.is_center = center + + def remove(self, child): + box_child = self._box.find_box_child(child) + if not box_child.is_center: + self._nflakes -= 1 + + self._box.remove(child) + + def do_set_box(self, box): + self._box = box + + def do_get_height_request(self, for_width): + size = self._calculate_size() + return (size, size) + + def do_get_width_request(self): + size = self._calculate_size() + return (size, size) + + def do_allocate(self, x, y, width, height, + req_width, req_height, origin_changed): + r = self._get_radius() + index = 0 + + for child in self._box.get_layout_children(): + min_width, child_width = child.get_width_request() + min_height, child_height = child.get_height_request(child_width) + + if child.is_center: + child.allocate(x + (width - child_width) / 2, + y + (height - child_height) / 2, + child_width, child_height, origin_changed) + else: + angle = 2 * math.pi * index / self._nflakes + + if self._nflakes != 2: + angle -= math.pi / 2 + + dx = math.cos(angle) * r + dy = math.sin(angle) * r + + child_x = int(x + (width - child_width) / 2 + dx) + child_y = int(y + (height - child_height) / 2 + dy) + + child.allocate(child_x, child_y, child_width, + child_height, origin_changed) + + index += 1 + + def _get_radius(self): + radius = int(_BASE_DISTANCE + _CHILDREN_FACTOR * self._nflakes) + for child in self._box.get_layout_children(): + if child.is_center: + [min_w, child_w] = child.get_width_request() + [min_h, child_h] = child.get_height_request(child_w) + radius += max(child_w, child_h) / 2 + + return radius + + def _calculate_size(self): + thickness = 0 + for child in self._box.get_layout_children(): + [min_width, child_width] = child.get_width_request() + [min_height, child_height] = child.get_height_request(child_width) + thickness = max(thickness, max(child_width, child_height)) + + return self._get_radius() * 2 + thickness |