190 lines
5.5 KiB
Python
190 lines
5.5 KiB
Python
# Copyright (C) 2006, 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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from array import array
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from random import random
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import gobject
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import hippo
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_X_TILES = 120
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_NUM_TRIALS = 20
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_MAX_WEIGHT = 255
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class _Grid(object):
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def __init__(self, x_tiles, y_tiles, cell_size):
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self._array = array('B')
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self.x_tiles = x_tiles
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self.y_tiles = y_tiles
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self.cell_size = cell_size
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for i in range(self.y_tiles * self.x_tiles):
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self._array.append(0)
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def __getitem__(self, (row, col)):
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return self._array[col + row * self.x_tiles]
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def __setitem__(self, (row, col), value):
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self._array[col + row * self.x_tiles] = value
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def compute_weight_at(self, x, y, width, height):
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weight = 0
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for i in range(x, x + width):
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for j in range(y, y + height):
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weight += self[j, i]
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return weight
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def add_weight_at(self, x, y, width, height):
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for i in range(x, x + width):
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for j in range(y, y + height):
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self[j, i] += 1
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def remove_weight_at(self, x, y, width, height):
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for i in range(x, x + width):
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for j in range(y, y + height):
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self[j, i] -= 1
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def from_canvas(self, dim):
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return dim / self.cell_size
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def to_canvas(self, dim):
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return dim * self.cell_size
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class _ItemInfo(gobject.GObject):
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def __init__(self):
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gobject.GObject.__init__(self)
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self.x = -1
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self.y = -1
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self.width = -1
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self.height = -1
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def add_weight(self, grid):
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grid.add_weight_at(self.x, self.y, self.width, self.height)
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def remove_weight(self, grid):
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grid.remove_weight_at(self.x, self.y, self.width, self.height)
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def compute_weight(self, grid, x=-1, y=-1):
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if x < 0:
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x = self.x
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if y < 0:
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y = self.y
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grid.compute_weight_at(x, y, self.width, self.height)
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class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
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__gtype_name__ = 'SugarSpreadBox'
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def __init__(self, **kwargs):
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hippo.CanvasBox.__init__(self, **kwargs)
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self._grid = None
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self._center = None
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self._width = -1
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self._height = -1
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def set_center_item(self, item):
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if self._center:
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self.remove(self._center)
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self.append(item, hippo.PACK_FIXED)
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self._center = item
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self._layout_center()
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def add_item(self, item):
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item.set_data('item-info', _ItemInfo())
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self.append(item, hippo.PACK_FIXED)
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self._layout_item(item)
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def remove_item(self, item):
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info = item.get_data('item-info')
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info.remove_weight(self._grid)
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self.remove(item)
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def _place_item(self, item, x, y):
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info = item.get_data('item-info')
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info.x = x
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info.y = y
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info.add_weight(self._grid)
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self.set_position(item, self._grid.to_canvas(x),
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self._grid.to_canvas(y))
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def _layout_item(self, item):
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if not self._grid:
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return
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info = item.get_data('item-info')
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[width, height] = item.get_allocation()
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info.width = self._grid.from_canvas(width)
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info.height = self._grid.from_canvas(height)
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trials = _NUM_TRIALS
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placed = False
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best_weight = _MAX_WEIGHT
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while trials > 0 and not placed:
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x = int(random() * (self._grid.x_tiles - info.width))
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y = int(random() * (self._grid.y_tiles - info.height))
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weight = info.compute_weight(self._grid, x, y)
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if weight == 0:
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self._place_item(item, x, y)
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placed = True
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elif weight < best_weight:
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best_x = x
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best_y = y
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trials -= 1
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if not placed:
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self._place_item(item, best_x, best_y)
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def _layout(self):
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for item in self.get_children():
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if item != self._center:
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self._layout_item(item)
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def _layout_center(self):
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if not self._center or not self._grid:
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return
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[width, height] = self._center.get_allocation()
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x = (self._width - width) / 2
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y = (self._height - height) / 2
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self.set_position(self._center, x, y)
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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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if width != self._width or height != self._height:
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cell_size = width / _X_TILES
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y_tiles = height / cell_size
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self._grid = _Grid(_X_TILES, y_tiles, cell_size)
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self._width = width
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self._height = height
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self._layout()
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self._layout_center()
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