sugarlabs/sugar-toolkit-gtk3
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Add an ItemInfo object associated with each item.

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Remove weight from the grid when removing items.
This commit is contained in:
Marco Pesenti Gritti 2007-05-10 10:42:56 +02:00
parent 5d14daf44b
commit ac4338e3c0
1 changed files with 53 additions and 15 deletions
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68
sugar/graphics/spreadbox.py
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@ -18,6 +18,7 @@
from array import array
from random import random
import gobject
import hippo
_X_TILES = 120
@ -58,6 +59,34 @@ class _Grid(object):
for i in range(x, x + width):
for j in range(y, y + height):
self[j, i] -= 1
def from_canvas(self, dim):
return dim / self.cell_size
def to_canvas(self, dim):
return dim * self.cell_size
class _ItemInfo(gobject.GObject):
def __init__(self):
gobject.GObject.__init__(self)
self.x = -1
self.y = -1
self.width = -1
self.height = -1
def add_weight(self, grid):
grid.add_weight_at(self.x, self.y, self.width, self.height)
def remove_weight(self, grid):
grid.remove_weight_at(self.x, self.y, self.width, self.height)
def compute_weight(self, grid, x=-1, y=-1):
if x < 0:
x = self.x
if y < 0:
y = self.y
grid.compute_weight_at(x, y, self.width, self.height)
class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
__gtype_name__ = 'SugarSpreadBox'
@ -79,38 +108,47 @@ class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
self._layout_center()
def add_item(self, item):
item.set_data('item-info', _ItemInfo())
self.append(item, hippo.PACK_FIXED)
self._layout_item(item)
def remove_item(self, item):
info = item.get_data('item-info')
info.remove_weigth(self._grid)
self.remove(item)
def _place_item(self, item, x, y):
info = item.get_data('item-info')
info.x = x
info.y = y
info.add_weight(self._grid)
def _place_item(self, item, x, y, w, h):
self._grid.add_weight_at(x, y, w, h)
self.set_position(item,
self._grid.cell_size * x,
self._grid.cell_size * y)
self.set_position(item, self._grid.to_canvas(x),
self._grid.to_canvas(y))
def _layout_item(self, item):
if not self._grid:
return
info = item.get_data('item-info')
[width, height] = item.get_allocation()
info.width = self._grid.from_canvas(width)
info.height = self._grid.from_canvas(height)
trials = _NUM_TRIALS
placed = False
best_weight = _MAX_WEIGHT
[width, height] = item.get_allocation()
w = int(width / self._grid.cell_size)
h = int(height / self._grid.cell_size)
while trials > 0 and not placed:
x = int(random() * (self._grid.x_tiles - w))
y = int(random() * (self._grid.y_tiles - h))
x = int(random() * (self._grid.x_tiles - info.width))
y = int(random() * (self._grid.y_tiles - info.height))
weight = info.compute_weight(self._grid, x, y)
weight = self._grid.compute_weight_at(x, y, w, h)
if weight == 0:
self._place_item(item, x, y, w, h)
self._place_item(item, x, y)
placed = True
elif weight < best_weight:
best_x = x
@ -119,7 +157,7 @@ class SpreadBox(hippo.CanvasBox, hippo.CanvasItem):
trials -= 1
if not placed:
self._place_item(item, best_x, best_y, w, h)
self._place_item(item, best_x, best_y)
def _layout(self):
for item in self.get_children():