Simple grid layout

sugar/canvas/GridLayout.py

@@ -0,0 +1,40 @@
+class GridConstraints:
+	def __init__(x, y, width, height):
+		self.x = x
+		self.y = y
+		self.width = width
+		self.height = height
+
+class GridLayout:
+	def __init__(self, rows, cols):
+		self._rows = rows
+		self._cols = cols
+
+		self._constraints = {}
+
+	def set_constraints(component, constraints):
+		self._constraints[component] = constraints
+
+	def _get_geometry(self, container, component):
+		constraints = self._constraints[component]
+		if constraints:
+			x = constraints.x * component.props.width / self._rows
+			y = constraints.y * component.props.height / self._cols
+			width = constraints.width * component.props.width / self._rows
+			height = constraints.height * component.props.height / self._cols
+
+			return [x, y, width, height]
+		else:
+			return [0, 0, 0, 0]
+
+	def layout_canvas_group(group):
+		i = 0
+		while i < group.get_n_children():
+			item = group.get_child(i)
+
+			[x, y, width, height] = self._get_geometry(group, item)
+
+			item.props.x = x
+			item.props.y = y
+			item.props.width = width
+			item.props.height = height