From 7fc1f05973a16f9852d6c25d4f2484384747e00a Mon Sep 17 00:00:00 2001
From: Tomeu Vizoso <tomeu@sugarlabs.org>
Date: Sat, 24 Jan 2009 16:51:28 +0000
Subject: Add a '+' button to the thought view for adding a child thought

---
diff --git a/canvas.py b/canvas.py
index ca1beb8..ef9e31b 100644
--- a/canvas.py
+++ b/canvas.py
@@ -56,8 +56,6 @@ class Canvas(gtk.DrawingArea):
         rect.x = 0
         rect.y = 0
 
-        logging.debug('__expose_event_cb1 %r %r %r %r' % (event.area.x, event.area.y,
-                          event.area.width, event.area.height))
         context.rectangle(event.area.x, event.area.y,
                           event.area.width, event.area.height)
         context.clip()
@@ -67,7 +65,6 @@ class Canvas(gtk.DrawingArea):
 
         for element in self._elements:
             rect = element.get_rect()
-            logging.debug('__expose_event_cb %r %r %r %r' % (rect.x, rect.y, rect.width, rect.height))
             if rect.intersect(event.area):
                 context.save()
 
@@ -154,12 +151,19 @@ class Canvas(gtk.DrawingArea):
 
     def __motion_notify_event_cb(self, widget, event):
         if self._last_clicked_element is None:
-            return True
+            for element in self._elements:
+                rect = element.get_rect()
+                if (event.x >= rect.x and event.x <= rect.x + rect.width) and \
+                        (event.y >= rect.y and event.y <= rect.y + rect.height):
+                    element.hovering = True
+                else:
+                    element.hovering = False
+            return False
 
         # if the mouse button is not pressed, no drag should occurr
         if not event.state & gtk.gdk.BUTTON1_MASK:
             self._cleanup_drag()
-            return True
+            return False
 
         if event.is_hint:
             x, y, state_ = event.window.get_pointer()
@@ -169,7 +173,7 @@ class Canvas(gtk.DrawingArea):
 
         if self._dragging:
             self.dragging_motion.send(self, position=(x, y))
-            return True
+            return False
 
         logging.debug('motion_notify_event_cb')
 
@@ -181,12 +185,13 @@ class Canvas(gtk.DrawingArea):
             self.dragging_started.send(self, position=(x, y),
                                        element=self._last_clicked_element)
 
-        return True
+        return False
 
 class CanvasElement(object):
     def __init__(self):
         self.invalidated = dispatch.Signal()
         self.previous_rect = gtk.gdk.Rectangle(0, 0, 0, 0)
+        self._hovering = False
 
     def draw(self, context):
         self.previous_rect = self.get_rect()
@@ -197,3 +202,13 @@ class CanvasElement(object):
     def get_rect(self):
         pass
 
+    def set_hovering(self, hovering):
+        if self._hovering != hovering:
+            self._hovering = hovering
+            self.invalidate()
+
+    def get_hovering(self):
+        return self._hovering
+
+    hovering = property(get_hovering, set_hovering)
+
diff --git a/thoughtview.py b/thoughtview.py
index 5d02365..cd79682 100644
--- a/thoughtview.py
+++ b/thoughtview.py
@@ -45,6 +45,7 @@ class ThoughtView(CanvasElement):
         self._last_height = -1
         self._dragging = False
         self._selected = False
+        self._add_control_rect = gtk.gdk.Rectangle(0, 0, 0, 0)
         
     def set_dragging(self, dragging):
         if self._dragging != dragging:
@@ -84,6 +85,9 @@ class ThoughtView(CanvasElement):
         width, height = self._draw_text(context)
         self._draw_bounding_box(context, width, height)
 
+        if self.hovering:
+            self._draw_controls(context, width, height)
+
         self._last_width = width
         self._last_height = height
         
@@ -139,6 +143,26 @@ class ThoughtView(CanvasElement):
         context.stroke()
         context.restore()
 
+    def _draw_controls(self, context, width, height):
+        context.save()
+
+        context.set_source_rgb(0.0, 0.0, 0.0)
+
+        layout = context.create_layout()
+        layout.set_text('+')
+
+        label_width, label_height = layout.get_pixel_size()
+
+        x = self.x + width - label_width
+        y = self.y
+        context.translate(x, y)
+        context.show_layout(layout)
+
+        context.restore()
+
+        self._add_control_rect = gtk.gdk.Rectangle(x, y, label_width,
+                                                   label_height)
+
     def get_rect(self):
         if -1 in (self._last_width, self._last_height):
             layout = self._get_name_layout()
--
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