107 lines
3.2 KiB
Python
107 lines
3.2 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 cairo
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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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_FLAKE_DISTANCE = units.points_to_pixels(4)
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class SnowflakeBox(hippo.CanvasBox, hippo.CanvasItem):
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__gtype_name__ = 'SugarSnowflakeBox'
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def __init__(self, **kwargs):
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hippo.CanvasBox.__init__(self, **kwargs)
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self._root = None
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def set_root(self, icon):
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self._root = icon
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def _get_center(self):
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[width, height] = self.get_allocation()
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return [width / 2, height / 2]
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def _get_radius(self):
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return _BASE_RADIUS + _CHILDREN_FACTOR * self._get_n_children()
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def _layout_root(self):
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[width, height] = self._root.get_allocation()
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[cx, cy] = self._get_center()
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x = cx - (width / 2)
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y = cy - (height / 2)
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self.set_position(self._root, int(x), int(y))
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def _get_n_children(self):
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return len(self.get_children()) - 1
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def _layout_child(self, child, index):
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r = self._get_radius()
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if (self._get_n_children() > 10):
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r += _FLAKE_DISTANCE * (index % 3)
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angle = 2 * math.pi * index / self._get_n_children()
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[width, height] = child.get_allocation()
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[cx, cy] = self._get_center()
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x = cx + math.cos(angle) * r - (width / 2)
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y = cy + math.sin(angle) * r - (height / 2)
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self.set_position(child, int(x), int(y))
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def _calculate_size(self):
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max_child_size = 0
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for child in self.get_children():
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[min_w, natural_w] = child.get_width_request()
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[min_h, natural_h] = child.get_height_request(min_w)
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max_child_size = max (max_child_size, min_w)
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max_child_size = max (max_child_size, min_h)
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return self._get_radius() * 2 + max_child_size + _FLAKE_DISTANCE * 2
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def do_get_height_request(self, for_width):
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hippo.CanvasBox.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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hippo.CanvasBox.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, width, height, origin_changed):
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hippo.CanvasBox.do_allocate(self, width, height, origin_changed)
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self._layout_root()
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index = 0
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for child in self.get_children():
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if child != self._root:
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self._layout_child(child, index)
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index += 1
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