1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
# Copyright (C) 2006-2007 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import math
from gi.repository import Gtk
from gi.repository import Gdk
from sugar3.graphics import style
_BASE_DISTANCE = style.zoom(25)
_CHILDREN_FACTOR = style.zoom(3)
class SnowflakeLayout(Gtk.Container):
__gtype_name__ = 'SugarSnowflakeLayout'
def __init__(self):
Gtk.Container.__init__(self)
self.set_has_window(False)
self._nflakes = 0
self._children = {}
def do_realize(self):
self.set_realized(True)
self.set_window(self.get_parent_window())
for child in self._children.keys():
child.set_parent_window(self.get_parent_window())
self.queue_resize()
def do_add(self, child):
if child.get_realized():
child.set_parent_window(self.get_parent_window())
child.set_parent(self)
def do_forall(self, include_internals, callback):
for child in self._children.keys():
callback(child)
def do_remove(self, child):
child.unparent()
def add_icon(self, child, center=False):
if not center:
self._nflakes += 1
self._children[child] = center
self.add(child)
def remove(self, child):
if not child in self._children:
return
if not self._children[child]: # not centered
self._nflakes -= 1
del self._children[child]
self.remove(child)
def do_get_preferred_size(self):
size = self._calculate_size()
requisition = Gtk.Requisition()
requisition.width = size
requisition.height = size
return (requisition, requisition)
def do_get_preferred_width(self):
size = self._calculate_size()
return (size, size)
def do_get_preferred_height(self):
size = self._calculate_size()
return (size, size)
def do_size_allocate(self, allocation):
self.set_allocation(allocation)
r = self._get_radius()
index = 0
for child, centered in self._children.items():
child_request = child.size_request()
child_width, child_height = \
child_request.width, child_request.height
rect = Gdk.Rectangle()
rect.x = 0
rect.y = 0
rect.width = child_width
rect.height = child_height
width = allocation.width - child_width
height = allocation.height - child_height
if centered:
rect.x = allocation.x + width / 2
rect.y = allocation.y + height / 2
else:
angle = 2 * math.pi * index / self._nflakes
if self._nflakes != 2:
angle -= math.pi / 2
dx = math.cos(angle) * r
dy = math.sin(angle) * r
rect.x = int(allocation.x + width / 2 + dx)
rect.y = int(allocation.y + height / 2 + dy)
index += 1
child.size_allocate(rect)
def _get_radius(self):
radius = int(_BASE_DISTANCE + _CHILDREN_FACTOR * self._nflakes)
for child, centered in self._children.items():
if centered:
child_request = child.size_request()
child_width, child_height = \
child_request.width, child_request.height
radius += max(child_width, child_height) / 2
return radius
def _calculate_size(self):
thickness = 0
for child in self._children.keys():
child_request = child.size_request()
child_width, child_height = \
child_request.width, child_request.height
thickness = max(thickness, max(child_width, child_height))
return self._get_radius() * 2 + thickness
|
