Move the layouts to be box and subclass them.

1 files changed, 67 insertions, 0 deletions

diff --git a/sugar/graphics/snowflakebox.py b/sugar/graphics/snowflakebox.py
new file mode 100644
index 0000000..4ee22c5
--- /dev/null
+++ b/sugar/graphics/snowflakebox.py
@@ -0,0 +1,67 @@
+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):
+		CanvasBox.__init__(self, **kwargs)
+
+		self._root = None
+		self._r = 0
+
+	def set_root(self, icon):
+		self._root = icon
+
+	def _layout_root(self):
+		[width, height] = self._root.get_allocation()
+
+		x = self._cx - (width / 2)
+		y = self._cy - (height / 2)
+
+		self.move(self._root, int(x), int(y))
+
+	def _layout_child(self, child, index):
+		r = self._r
+		if (len(box.get_children()) > 10):
+			r += _FLAKE_DISTANCE * (index % 3)
+
+		angle = 2 * math.pi / len(box.get_children()) * index
+
+		[width, height] = child.get_allocation()
+		x = self._cx + math.cos(angle) * r - (width / 2)
+		y = self._cy + math.sin(angle) * r - (height / 2)
+
+		self.move(child, int(x), int(y))
+
+	def do_get_width_request(self):
+		max_child_size = 0
+		for child in box.get_children():
+			[width, height] = child.get_allocation()
+			max_child_size = max (max_child_size, width)
+			max_child_size = max (max_child_size, height)
+
+		return self._r * 2 + max_child_size + _FLAKE_DISTANCE * 2
+
+	def do_get_height_request(self, width):
+		return width
+
+	def do_allocate(self, width, height):
+		self._r = _BASE_RADIUS + _CHILDREN_FACTOR * len(box.get_children())
+
+		hippo.CanvasBox.do_allocate(self, width, height)
+
+		self._cx = self.get_width_request() / 2
+		self._cy = self.get_height_request() / 2
+
+		self._layout_root(box)
+
+		index = 0
+		for child in box.get_children():
+			self._layout_child(child, index)
+			index += 1