Write a GridModel, with correct size and layout, and use it

sugar/canvas/CanvasWindow.py

@@ -6,7 +6,7 @@ class CanvasWindow(gtk.Window):
 		gtk.Window.__init__(self)
 
 		self._view = goocanvas.CanvasView()
-		self._view.set_model(model)
+		self._view.set_model(model.get())
 		self.add(self._view)
 		self._view.show()
 

sugar/canvas/GridModel.py

@@ -0,0 +1,30 @@
+import goocanvas
+
+from sugar.canvas.GridLayout import GridGroup
+
+# FIXME model subclassing doesn't work in pygoocanvas
+
+class GridModel:
+	def __init__(self, bg_color):
+		self._model = goocanvas.CanvasModelSimple()
+
+		self._width = 800
+		self._height = 600
+
+		item = goocanvas.Rect(width=self._width, height=self._height,
+							  line_width=0, fill_color=bg_color)
+		self._model.get_root_item().add_child(item)
+
+		self._root = GridGroup()
+		self._root.props.width = self._width
+		self._root.props.height = self._height
+		self._model.get_root_item().add_child(self._root)
+
+	def add(self, child):
+		self._root.add_child(child)
+
+	def get(self):
+		return self._model
+
+	def get_layout(self):
+		return self._root.get_layout()