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240 lines
7.8 KiB
Python
240 lines
7.8 KiB
Python
# Copyright (C) 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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from numpy import array
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from random import random
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import hippo
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import gobject
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import gtk
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_PLACE_TRIALS = 20
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_MAX_WEIGHT = 255
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_CELL_SIZE = 4
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class _Grid(gobject.GObject):
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__gsignals__ = {
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'child-changed' : (gobject.SIGNAL_RUN_FIRST,
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gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT]))
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}
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def __init__(self, width, height):
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gobject.GObject.__init__(self)
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self.width = width
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self.height = height
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self._children = []
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self._collisions = []
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self._collisions_sid = 0
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self._array = array([0], dtype='b')
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self._array.resize(width * height)
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def add(self, child, width, height):
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trials = _PLACE_TRIALS
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weight = _MAX_WEIGHT
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while trials > 0 and weight:
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x = int(random() * (self.width - width))
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y = int(random() * (self.height - height))
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rect = gtk.gdk.Rectangle(x, y, width, height)
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new_weight = self._compute_weight(rect)
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if weight > new_weight:
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weight = new_weight
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trials -= 1
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child.grid_rect = rect
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child.locked = False
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self._add_child(child)
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if weight > 0:
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self._detect_collisions(child)
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def remove(self, child):
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self._children.remove(child)
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self._remove_weight(child.grid_rect)
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child.grid_rect = None
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def _add_child(self, child):
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self._children.append(child)
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self.add_weight(child.grid_rect)
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def _move_child(self, child, new_rect):
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self._remove_weight(child.grid_rect)
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self.add_weight(new_rect)
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child.grid_rect = new_rect
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self.emit('child-changed', child)
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def _shift_child(self, child):
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rect = child.grid_rect
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weight = self._compute_weight(rect)
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new_rects = []
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if (rect.x + rect.width < self.width - 1):
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new_rects.append(gtk.gdk.Rectangle(rect.x + 1, rect.y,
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rect.width, rect.height))
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if (rect.x - 1 > 0):
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new_rects.append(gtk.gdk.Rectangle(rect.x - 1, rect.y,
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rect.width, rect.height))
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if (rect.y + rect.height < self.height - 1):
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new_rects.append(gtk.gdk.Rectangle(rect.x, rect.y + 1,
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rect.width, rect.height))
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if (rect.y - 1 > 0):
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new_rects.append(gtk.gdk.Rectangle(rect.x, rect.y - 1,
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rect.width, rect.height))
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best_rect = None
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for new_rect in new_rects:
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new_weight = self._compute_weight(new_rect)
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if new_weight < weight:
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best_rect = new_rect
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weight = new_weight
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if best_rect:
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self._move_child(child, best_rect)
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return weight
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def _solve_collisions(self):
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for collision in self._collisions[:]:
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weight = self._shift_child(collision)
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if not weight:
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self._collisions.remove(collision)
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return (len(self._collisions) > 0)
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def _detect_collisions(self, child):
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collision_found = False
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for c in self._children:
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intersection = child.grid_rect.intersect(c.grid_rect)
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if c != child and intersection.width > 0:
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if c not in self._collisions:
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collision_found = True
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self._collisions.append(c)
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if collision_found:
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if child not in self._collisions:
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self._collisions.append(child)
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# if len(self._collisions) and not self._collisions_sid:
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# self._collisions_sid = gobject.idle_add(self._solve_collisions)
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def add_weight(self, rect):
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for i in range(rect.x, rect.x + rect.width):
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for j in range(rect.y, rect.y + rect.height):
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self[j, i] += 1
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def _remove_weight(self, rect):
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for i in range(rect.x, rect.x + rect.width):
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for j in range(rect.y, rect.y + rect.height):
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self[j, i] -= 1
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def _compute_weight(self, rect):
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weight = 0
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for i in range(rect.x, rect.x + rect.width):
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for j in range(rect.y, rect.y + rect.height):
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weight += self[j, i]
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return weight
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def __getitem__(self, (row, col)):
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return self._array[col + row * self.width]
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def __setitem__(self, (row, col), value):
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self._array[col + row * self.width] = value
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class SpreadLayout(gobject.GObject,hippo.CanvasLayout):
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__gtype_name__ = 'SugarSpreadLayout'
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def __init__(self):
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gobject.GObject.__init__(self)
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min_width, width = self.do_get_width_request()
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min_height, height = self.do_get_height_request(width)
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self._grid = _Grid(width / _CELL_SIZE, height / _CELL_SIZE)
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self._grid.connect('child-changed', self._grid_child_changed_cb)
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def add_center(self, child):
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self._box.append(child)
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width, height = self._get_child_grid_size(child)
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rect = gtk.gdk.Rectangle(int((self._grid.width - width) / 2),
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int((self._grid.height - height) / 2),
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width + 1, height + 1)
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self._grid.add_weight(rect)
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box_child = self._box.find_box_child(child)
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box_child.grid_rect = None
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def add(self, child):
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self._box.append(child)
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width, height = self._get_child_grid_size(child)
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box_child = self._box.find_box_child(child)
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self._grid.add(box_child, width, height)
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def remove(self, child):
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box_child = self._box.find_box_child(child)
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self._grid.remove(box_child)
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self._box.remove(child)
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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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return 0, gtk.gdk.screen_height()
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def do_get_width_request(self):
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return 0, gtk.gdk.screen_width()
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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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for child in self._box.get_layout_children():
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rect = child.grid_rect
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if child.grid_rect:
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child.allocate(rect.x * _CELL_SIZE,
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rect.y * _CELL_SIZE,
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rect.width * _CELL_SIZE,
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rect.height * _CELL_SIZE,
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origin_changed)
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else:
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min_w, child_width = child.get_width_request()
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min_h, child_height = child.get_height_request(child_width)
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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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def _get_child_grid_size(self, child):
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min_width, width = child.get_width_request()
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min_height, height = child.get_height_request(width)
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return int(width / _CELL_SIZE), int(height / _CELL_SIZE)
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def _grid_child_changed_cb(self, grid, box_child):
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box_child.item.emit_request_changed()
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