105 lines
3.3 KiB
Python
105 lines
3.3 KiB
Python
# Copyright (C) 2006-2007 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import math
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import gobject
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import hippo
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from sugar.graphics import units
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_BASE_RADIUS = units.points_to_pixels(20)
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_CHILDREN_FACTOR = 1
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class SnowflakeLayout(gobject.GObject,hippo.CanvasLayout):
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__gtype_name__ = 'SugarSnowflakeLayout'
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def __init__(self):
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gobject.GObject.__init__(self)
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self._nflakes = 0
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def add(self, child):
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self._box.append(child)
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box_child = self._box.find_box_child(child)
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box_child.is_center = False
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self._nflakes += 1
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def add_center(self, child):
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self._box.append(child)
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box_child = self._box.find_box_child(child)
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box_child.is_center = True
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def do_set_box(self, box):
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self._box = box
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def do_get_height_request(self, for_width):
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size = self._calculate_size()
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return (size, size)
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def do_get_width_request(self):
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size = self._calculate_size()
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return (size, size)
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def do_allocate(self, x, y, width, height,
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req_width, req_height, origin_changed):
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r = self._get_radius()
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index = 0
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for child in self._box.get_layout_children():
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cx = x + width / 2
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cy = x + height / 2
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min_width, child_width = child.get_width_request()
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min_height, child_height = child.get_height_request(child_width)
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if child.is_center:
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child.allocate(x + (width - child_width) / 2,
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y + (height - child_height) / 2,
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child_width, child_height, origin_changed)
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else:
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angle = 2 * math.pi * index / self._nflakes
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dx = math.cos(angle) * r
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dy = math.sin(angle) * r
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child_x = int(x + (width - child_width) / 2 + dx)
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child_y = int(y + (height - child_height) / 2 + dy)
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child.allocate(child_x, child_y, child_width,
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child_height, origin_changed)
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index += 1
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def _get_radius(self):
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return int(_BASE_RADIUS + _CHILDREN_FACTOR * self._nflakes)
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def _calculate_size(self):
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size = 0
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for child in self._box.get_layout_children():
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[min_width, child_width] = child.get_width_request()
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[min_height, child_height] = child.get_height_request(child_width)
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new_size = max(child_width, child_height)
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if not child.is_center:
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new_size += self._get_radius() * 2
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if new_size > size:
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size = new_size
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return size
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