sugar-toolkit-gtk3/sugar/graphics/snowflakebox.py

80 lines
1.9 KiB
Python
Raw Normal View History

import math
import cairo
import hippo
_BASE_RADIUS = 65
_CHILDREN_FACTOR = 1
_FLAKE_DISTANCE = 6
class SnowflakeBox(hippo.CanvasBox, hippo.CanvasItem):
__gtype_name__ = 'SugarSnowflakeBox'
def __init__(self, **kwargs):
2006-10-06 11:17:38 +02:00
hippo.CanvasBox.__init__(self, **kwargs)
self._root = None
def set_root(self, icon):
self._root = icon
2006-10-10 00:56:19 +02:00
def _get_center(self):
[width, height] = self.get_allocation()
return [width / 2, height / 2]
def _get_radius(self):
2006-10-10 01:14:24 +02:00
return _BASE_RADIUS + _CHILDREN_FACTOR * self._get_n_children()
2006-10-10 00:56:19 +02:00
def _layout_root(self):
[width, height] = self._root.get_allocation()
2006-10-10 00:56:19 +02:00
[cx, cy] = self._get_center()
2006-10-10 00:56:19 +02:00
x = cx - (width / 2)
y = cy - (height / 2)
self.move(self._root, int(x), int(y))
2006-10-10 01:14:24 +02:00
def _get_n_children(self):
return len(self.get_children()) - 1
def _layout_child(self, child, index):
2006-10-10 00:56:19 +02:00
r = self._get_radius()
2006-10-10 01:14:24 +02:00
if (self._get_n_children() > 10):
r += _FLAKE_DISTANCE * (index % 3)
2006-10-10 01:14:24 +02:00
angle = 2 * math.pi * index / self._get_n_children()
[width, height] = child.get_allocation()
2006-10-10 00:56:19 +02:00
[cx, cy] = self._get_center()
x = cx + math.cos(angle) * r - (width / 2)
y = cy + math.sin(angle) * r - (height / 2)
self.move(child, int(x), int(y))
def do_get_width_request(self):
2006-10-06 11:17:38 +02:00
hippo.CanvasBox.do_get_width_request(self)
max_child_size = 0
2006-10-06 11:17:38 +02:00
for child in self.get_children():
2006-10-06 11:34:29 +02:00
width = child.get_width_request()
height = child.get_height_request(width)
max_child_size = max (max_child_size, width)
max_child_size = max (max_child_size, height)
2006-10-10 00:56:19 +02:00
return self._get_radius() * 2 + \
max_child_size + _FLAKE_DISTANCE * 2
def do_get_height_request(self, width):
2006-10-06 11:17:38 +02:00
hippo.CanvasBox.do_get_height_request(self, width)
return width
def do_allocate(self, width, height):
hippo.CanvasBox.do_allocate(self, width, height)
2006-10-06 11:17:38 +02:00
self._layout_root()
index = 0
2006-10-06 11:17:38 +02:00
for child in self.get_children():
2006-10-06 11:34:29 +02:00
if child != self._root:
self._layout_child(child, index)
index += 1