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# 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 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):
# FIXME what is this for?
self.set_realized(True)
self.set_window(self.get_parent_window())
self.style.attach(self.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_size_request(self, requisition):
size = self._calculate_size()
requisition.width = size
requisition.height = size
def do_size_allocate(self, allocation):
r = self._get_radius()
index = 0
for child, centered in self._children.items():
child_width, child_height = child.size_request()
rect = (0, 0, child_width, 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_w, child_h = child.size_request()
radius += max(child_w, child_h) / 2
return radius
def _calculate_size(self):
thickness = 0
for child in self._children.keys():
width, height = child.size_request()
thickness = max(thickness, max(width, height))
return self._get_radius() * 2 + thickness
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