First attempt to make cairo rectangle draggable.

tests/cairotest.py

@@ -19,6 +19,14 @@ class Rectangle(mt.RectangularWidget):
         self.scale = 1
         self.color = color
 
+        self.on_drag(self.move)
+
+    def move(self, g):
+        print 'drag rectangle', g.get_translation()
+        self.translate(*g.get_translation())
+        print self
+        refresh()
+
     def scale(self, angle):
         self.scale *= scale
 
@@ -27,7 +35,7 @@ class Rectangle(mt.RectangularWidget):
 
     def get_transformation_matrix(self):
         t = cairo.Matrix()
-        t.translate(*self.get_position())
+        t.translate(*self)
         t.rotate(self.angle)
         t.scale(self.scale, self.scale)
         return t
@@ -48,8 +56,6 @@ def create_context_window(w, h, callback):
     def create_context(area, event):
         """Add Cairo context to GTK window and draw initial state."""
         global cr
-        #if cr:
-        #    return
         cr = area.window.cairo_create()
         draw()
 
@@ -78,24 +84,26 @@ def create_context_window(w, h, callback):
     root = mt.RectangularWidget(0, 0, w, h)
 
     # GTK window
-    win = gtk.Window()
-    win.set_title('Cairo test')
-    win.connect('destroy', quit)
-    win.connect('key-press-event', handle_key)
-    win.connect('configure-event', move_window)
-    win.connect('show', callback)
+    global window
+    window = gtk.Window()
+    window.set_title('Cairo test')
+    window.connect('destroy', quit)
+    window.connect('key-press-event', handle_key)
+    window.connect('configure-event', move_window)
+    window.connect('show', callback)
 
     # Drawing area, needed by cairo context for drawing
     area = gtk.DrawingArea()
     area.set_size_request(w, h)
     area.connect('expose-event', create_context)
 
-    win.add(area)
+    window.add(area)
     area.show()
-    win.show()
+    window.show()
 
 
-def draw():
+def draw(*args):
+    print 'draw'
     # Background
     cr.rectangle(0, 0, *root.get_size())
     cr.set_source_rgb(0, 1, 0)
@@ -103,13 +111,17 @@ def draw():
 
     # Drawable objects (use save and restore to allow transformations)
     for obj in draw_objects:
-        #cr.save()
+        cr.save()
         obj.draw(cr)
-        #cr.restore()
+        cr.restore()
+
+
+def refresh():
+    window.queue_draw()
 
 
 # Initialization
-cr = root = None
+window = cr = root = None
 draw_objects = []