--- 05-extra.py	2006-01-03 17:43:12.000000000 -0200
+++ 06-polishing.py	2006-01-03 17:51:02.000000000 -0200
@@ -35,6 +35,17 @@
 class Tool( object ):
     """Interface to be implemented by tools."""
 
+    def set_active( self, app ):
+        """This tool is now active."""
+        pass
+    # set_active()
+
+
+    def set_inactive( self, app ):
+        """This tool is now inactive. """
+        pass
+    # set_inactive()
+
 
     def mouse( self, app, canvas, buttons, x, y ):
         """This tool have a user feedback using mouse on canvas."""
@@ -47,13 +58,29 @@
 class Line( Tool ):
     def __init__( self ):
         self.first_point = None
+        self.message_id = None
     # __init__()
 
 
+    def set_active( self, app ):
+        self.message_id = app.status_message(
+            "Press the left mouse button to mark the first point." )
+    # set_active()
+
+
+    def set_inactive( self, app ):
+        if self.message_id is not None:
+            app.remove_status_message( self.message_id )
+    # set_inactive()
+
+
     def mouse( self, app, canvas, buttons, x, y ):
         if buttons & Canvas.MOUSE_BUTTON_1:
             if self.first_point is None:
                 self.first_point = ( x, y )
+                self.inner_message_id = app.status_message(
+                    ( "First poit at ( %d, %d ). Now mark the second." ) %
+                    ( x, y ) )
             else:
                 color = app[ "fg" ]
                 size  = app[ "size" ]
@@ -61,6 +88,7 @@
                 app.undo.push()
                 canvas.draw_line( x0, y0, x, y, color, size )
                 self.first_point = None
+                app.remove_status_message( self.inner_message_id )
     # mouse()
 # Line
 
@@ -69,10 +97,23 @@
 class Pencil( Tool ):
     def __init__( self ):
         self.last_point = None
+        self.message_id = None
         self.changed = False
     # __init__()
 
 
+    def set_active( self, app ):
+        self.message_id = app.status_message(
+            "Press the left mouse button and move your mouse." )
+    # set_active()
+
+
+    def set_inactive( self, app ):
+        if self.message_id is not None:
+            app.remove_status_message( self.message_id )
+    # set_inactive()
+
+
     def mouse( self, app, canvas, buttons, x, y ):
         if buttons & Canvas.MOUSE_BUTTON_1:
             if not self.changed:
@@ -107,13 +148,31 @@
 class Rectangle( Tool ):
     def __init__( self ):
         self.first_point = None
+        self.message_id = None
     # __init__()
 
 
+    def set_active( self, app ):
+        app[ "rectgroup" ].show()
+        self.message_id = app.status_message(
+            "Press the left mouse button to mark first point." )
+    # set_active()
+
+
+    def set_inactive( self, app ):
+        app[ "rectgroup" ].hide()
+        if self.message_id is not None:
+            app.remove_status_message( self.message_id )
+    # set_inactive()
+
+
     def mouse( self, app, canvas, buttons, x, y ):
         if buttons & Canvas.MOUSE_BUTTON_1:
             if self.first_point is None:
                 self.first_point = ( x, y )
+                self.inner_message_id = app.status_message(
+                    ( "First poit at ( %d, %d ). Now mark the second." ) %
+                    ( x, y ) )
             else:
                 fg   = app[ "fg" ]
                 bg   = app[ "bg" ]
@@ -133,12 +192,33 @@
                 app.undo.push()
                 canvas.draw_rectangle( x0, y0, w, h, fg, size, bg, fill )
                 self.first_point = None
+                app.remove_status_message( self.inner_message_id )
     # mouse()
 # Rectangle
 
 
 
 class Text( Tool ):
+    def __init__( self ):
+        self.message_id = None
+    # __init__()
+
+
+    def set_active( self, app ):
+        app[ "textgroup" ].show()
+        self.message_id = app.status_message(
+            "Type your text in 'Contents' and press the left button " \
+            "to place it." )
+    # set_active()
+
+
+    def set_inactive( self, app ):
+        app[ "textgroup" ].hide()
+        if self.message_id is not None:
+            app.remove_status_message( self.message_id )
+    # set_inactive()
+
+
     def mouse( self, app, canvas, buttons, x, y ):
         if buttons & Canvas.MOUSE_BUTTON_1 and app[ "text" ]:
             text  = app[ "text" ]
@@ -165,6 +245,16 @@
 def_tool="Line"
 
 
+def tool_changed( app, tool, value ):
+    if tool_changed.last_tool:
+        tool_changed.last_tool.set_inactive( app )
+
+    t = tools[ value ]
+    tool_changed.last_tool = t
+    t.set_active( app )
+# tool_changed()
+tool_changed.last_tool = None
+
 
 def canvas_action( app, canvas, buttons, x, y ):
     tool = app[ "tool" ]
@@ -215,6 +305,7 @@
                              label="Tool:",
                              options=tools.keys(),
                              active=def_tool,
+                             callback=tool_changed,
                              ),
                   UIntSpin( id="size",
                             label="Line Size:",
@@ -264,6 +355,12 @@
                     )
            )
 
+
+for tool in tools.itervalues():
+    tool.set_inactive( app )
+
+tool_changed( app, app.get_widget_by_id( "tool" ), def_tool )
+
 Undo( app )
 
 run()