Fix the drawing of ColorToolButton, RadioToolButton and ToggleToolButton

gtk_paint_box is deprecated [1] and now we can use the CSS to change
the style of the button's prelight state.

To test the buttons, I provide a patch for HelloWorld activity [2].
They are added in the main toolbar.

Signed-off-by: Manuel Quiñones <manuq@laptop.org>

[1] http://developer.gnome.org/gtk3/stable/GtkStyle.html#gtk-paint-box
[2] http://dev.laptop.org/~manuq/shell-port/test_gtk3_buttons.patch

src/sugar3/graphics/colorbutton.py

@@ -523,20 +523,14 @@ class ColorToolButton(Gtk.ToolItem):
 
     title = GObject.property(type=str, getter=get_title, setter=set_title)
 
-    def do_expose_event(self, event):
+    def do_draw(self, cr):
         child = self.get_child()
         allocation = self.get_allocation()
         if self._palette and self._palette.is_up():
             invoker = self._palette.props.invoker
-            invoker.draw_rectangle(event, self._palette)
-        elif child.state == Gtk.StateType.PRELIGHT:
-            child.style.paint_box(event.window, Gtk.StateType.PRELIGHT,
-                                  Gtk.ShadowType.NONE, event.area,
-                                  child, 'toolbutton-prelight',
-                                  allocation.x, allocation.y,
-                                  allocation.width, allocation.height)
-
-        Gtk.ToolButton.do_expose_event(self, event)
+            invoker.draw_rectangle(cr, self._palette)
+
+        Gtk.ToolButton.do_draw(self, cr)
 
     def __notify_change(self, widget, pspec):
         self.notify(pspec.name)

src/sugar3/graphics/radiotoolbutton.py

@@ -165,18 +165,12 @@ class RadioToolButton(Gtk.RadioToolButton):
     palette_invoker = GObject.property(
         type=object, setter=set_palette_invoker, getter=get_palette_invoker)
 
-    def do_expose_event(self, event):
+    def do_draw(self, cr):
         child = self.get_child()
         allocation = self.get_allocation()
 
         if self.palette and self.palette.is_up():
             invoker = self.palette.props.invoker
-            invoker.draw_rectangle(event, self.palette)
-        elif child.state == Gtk.StateType.PRELIGHT:
-            child.style.paint_box(event.window, Gtk.StateType.PRELIGHT,
-                                  Gtk.ShadowType.NONE, event.area,
-                                  child, 'toolbutton-prelight',
-                                  allocation.x, allocation.y,
-                                  allocation.width, allocation.height)
-
-        Gtk.RadioToolButton.do_expose_event(self, event)
+            invoker.draw_rectangle(cr, self.palette)
+
+        Gtk.RadioToolButton.do_draw(self, cr)

src/sugar3/graphics/toggletoolbutton.py

@@ -113,20 +113,14 @@ class ToggleToolButton(Gtk.ToggleToolButton):
     accelerator = GObject.property(type=str, setter=set_accelerator,
                                    getter=get_accelerator)
 
-    def do_expose_event(self, event):
+    def do_draw(self, cr):
         allocation = self.get_allocation()
         child = self.get_child()
 
         if self.palette and self.palette.is_up():
             invoker = self.palette.props.invoker
-            invoker.draw_rectangle(event, self.palette)
-        elif child.state == Gtk.StateType.PRELIGHT:
-            child.style.paint_box(event.window, Gtk.StateType.PRELIGHT,
-                                  Gtk.ShadowType.NONE, event.area,
-                                  child, 'toolbutton-prelight',
-                                  allocation.x, allocation.y,
-                                  allocation.width, allocation.height)
-
-        Gtk.ToggleToolButton.do_expose_event(self, event)
+            invoker.draw_rectangle(cr, self.palette)
+
+        Gtk.ToggleToolButton.do_draw(self, cr)
 
     palette = property(get_palette, set_palette)