Support for previews in the journal.

shell/view/Shell.py

@@ -214,13 +214,13 @@ class Shell(gobject.GObject):
         file_path = os.path.join(tempfile.gettempdir(), '%i' % time.time())
 
         window = gtk.gdk.get_default_root_window()
-        width, height = window.get_size();
-        x_orig, y_orig = window.get_origin();
+        width, height = window.get_size()
+        x_orig, y_orig = window.get_origin()
 
         screenshot = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, has_alpha=False,
                                     bits_per_sample=8, width=width, height=height)
         screenshot.get_from_drawable(window, window.get_colormap(), x_orig, y_orig, 0, 0,
-                                     width, height);
+                                     width, height)
         screenshot.save(file_path, "png")
 
         jobject = datastore.create()

sugar/activity/activity.py

@@ -27,9 +27,11 @@ import time
 import tempfile
 
 import gtk, gobject
-
+import dbus
+        
 from sugar.presence import presenceservice
 from sugar.activity.activityservice import ActivityService
+from sugar.graphics import units
 from sugar.graphics.window import Window
 from sugar.graphics.toolbox import Toolbox
 from sugar.graphics.toolbutton import ToolButton
@@ -276,6 +278,25 @@ class Activity(Window, gtk.Container):
 
     def save(self):
         """Request that the activity is saved to the Journal."""
+        preview_pixbuf = self.get_canvas_screenshot()
+        preview_pixbuf = preview_pixbuf.scale_simple(units.grid_to_pixels(4),
+                                                     units.grid_to_pixels(4),
+                                                     gtk.gdk.INTERP_BILINEAR)
+
+        # TODO: Find a way of taking a png out of the pixbuf without saving to a temp file.
+        fd, file_path = tempfile.mkstemp('.png')
+        del fd
+        preview_pixbuf.save(file_path, 'png')
+        f = open(file_path)
+        try:
+            preview_data = f.read()
+        finally:
+            f.close()
+            os.remove(file_path)
+
+        # TODO: Take this out when the datastore accepts binary data.        
+        import base64
+        self.metadata['preview'] = base64.b64encode(preview_data)
         try:
             file_path = os.path.join(tempfile.gettempdir(), '%i' % time.time())
             self.write_file(file_path)

sugar/datastore/datastore.py

@@ -96,7 +96,7 @@ def create():
     return DSObject(object_id=None, metadata=DSMetadata(), file_path=None)
 
 def write(ds_object, reply_handler=None, error_handler=None):
-    logging.debug('datastore.write: %r' % ds_object.metadata.get_dictionary())
+    logging.debug('datastore.write')
     if ds_object.object_id:
         dbus_helpers.update(ds_object.object_id,
                             ds_object.metadata.get_dictionary(),

sugar/graphics/window.py

@@ -53,3 +53,16 @@ class Window(gtk.Window):
         group = gtk.Window()
         group.realize()
         window.window.set_group(group.window)
+
+    def get_canvas_screenshot(self):
+        if not self.canvas:
+            return None
+
+        window = self.canvas.window
+        width, height = window.get_size()
+
+        screenshot = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, has_alpha=False,
+                                    bits_per_sample=8, width=width, height=height)
+        screenshot.get_from_drawable(window, window.get_colormap(), 0, 0, 0, 0,
+                                     width, height)
+        return screenshot