[Viewer] Color & thickness saving

- For each tool color & thickness is saved in memory.

Fixes #6

hadaly/painter.py

@@ -19,10 +19,14 @@ class Painter(Widget):
     locked = BooleanProperty(False)
 
     def on_thickness(self, instance, value):
-        self.thickness = value
+        self.tools[self.current_tool]['thickness'] = value
 
     def on_color(self, instance, value):
-        self.color = value
+        self.tools[self.current_tool]['color'] = value
+
+    def on_current_tool(self, instance, value):
+        self.color = self.tools[value]['color']
+        self.thickness = self.tools[value]['thickness']
 
     def on_touch_down(self, touch):
         if not self.locked and self.collide_point(*touch.pos):

hadaly/viewer.py

@@ -199,7 +199,7 @@ class SlideViewer(ScatterLayout):
                                      paint_color=self.painter.tools[self.painter.current_tool]['color'],
                                      thickness=self.painter.thickness)
             self.painter.bind(thickness=toolbar.on_thickness)
-            toolbar.bind(paint_color=self.painter.on_color)
+            self.painter.bind(color=toolbar.on_paint_color)
             self.slidebox.toolbar.add_widget(toolbar)
             self.app.root.get_screen('viewer').carousel.scroll_timeout = 50
         elif self.locked:
@@ -233,6 +233,7 @@ class PainterToolBar(BoxLayout):
 
     def on_paint_color(self, instance, value):
         self.paint_color = value
+        self.painter.color = value
 
     def on_thickness(self, instance, value):
         self.thickness = value