1 files changed, 111 insertions, 0 deletions
diff --git a/src/jarabe/desktop/snowflakelayout.py b/src/jarabe/desktop/snowflakelayout.py
new file mode 100644
index 0000000..e4963ba
--- /dev/null
+++ b/src/jarabe/desktop/snowflakelayout.py
@@ -0,0 +1,111 @@
+# 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
+
+import gobject
+import hippo
+
+from sugar.graphics import style
+
+
+_BASE_DISTANCE = style.zoom(25)
+_CHILDREN_FACTOR = style.zoom(3)
+
+
+class SnowflakeLayout(gobject.GObject, hippo.CanvasLayout):
+    __gtype_name__ = 'SugarSnowflakeLayout'
+
+    def __init__(self):
+        gobject.GObject.__init__(self)
+        self._nflakes = 0
+        self._box = None
+
+    def add(self, child, center=False):
+        if not center:
+            self._nflakes += 1
+
+        self._box.append(child)
+
+        box_child = self._box.find_box_child(child)
+        box_child.is_center = center
+
+    def remove(self, child):
+        box_child = self._box.find_box_child(child)
+        if not box_child.is_center:
+            self._nflakes -= 1
+
+        self._box.remove(child)
+
+    def do_set_box(self, box):
+        self._box = box
+
+    def do_get_height_request(self, for_width):
+        size = self._calculate_size()
+        return (size, size)
+
+    def do_get_width_request(self):
+        size = self._calculate_size()
+        return (size, size)
+
+    def do_allocate(self, x, y, width, height,
+                    req_width, req_height, origin_changed):
+        r = self._get_radius()
+        index = 0
+
+        for child in self._box.get_layout_children():
+            min_width, child_width = child.get_width_request()
+            min_height, child_height = child.get_height_request(child_width)
+
+            if child.is_center:
+                child.allocate(x + (width - child_width) / 2,
+                               y + (height - child_height) / 2,
+                               child_width, child_height, origin_changed)
+            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
+
+                child_x = int(x + (width - child_width) / 2 + dx)
+                child_y = int(y + (height - child_height) / 2 + dy)
+
+                child.allocate(child_x, child_y, child_width,
+                               child_height, origin_changed)
+
+                index += 1
+
+    def _get_radius(self):
+        radius = int(_BASE_DISTANCE + _CHILDREN_FACTOR * self._nflakes)
+        for child in self._box.get_layout_children():
+            if child.is_center:
+                [min_w, child_w] = child.get_width_request()
+                [min_h, child_h] = child.get_height_request(child_w)
+                radius += max(child_w, child_h) / 2
+
+        return radius
+
+    def _calculate_size(self):
+        thickness = 0
+        for child in self._box.get_layout_children():
+            [min_width, child_width] = child.get_width_request()
+            [min_height, child_height] = child.get_height_request(child_width)
+            thickness = max(thickness, max(child_width, child_height))
+
+        return self._get_radius() * 2 + thickness