Add image preview to clipboard

Fixes #4614

src/jarabe/frame/clipboard.py

@@ -25,6 +25,7 @@
 from gi.repository import Gdk
 
 from sugar3 import mime
+from sugar3.graphics.objectchooser import get_preview_pixbuf
 
 from jarabe.frame.clipboardobject import ClipboardObject, Format
 
@@ -140,6 +141,12 @@ def _process_object(self, cb_object):
                     cb_object.get_id(), 'text/plain',
                     data=formats['UTF8_STRING'].get_data(), on_disk=False)
 
+        if 'image/png' in formats.keys():
+            pixbuf = get_preview_pixbuf(formats['image/png'].get_data())
+            self.add_object_format(
+                cb_object.get_id(), 'image/x-pixbuf',
+                data=pixbuf, on_disk=False)
+
     def get_object(self, object_id):
         logging.debug('Clipboard.get_object')
         return self._objects[object_id]

src/jarabe/frame/clipboardmenu.py

@@ -23,6 +23,7 @@
 from gi.repository import GLib
 
 from gi.repository import Gtk
+from gi.repository import GdkPixbuf
 
 from sugar3.graphics.palette import Palette
 from sugar3.graphics.menuitem import MenuItem
@@ -146,12 +147,18 @@ def _object_state_changed_cb(self, cb_service, cb_object):
     def _update(self):
         name = self._cb_object.get_name()
         self.props.primary_text = GLib.markup_escape_text(name)
-        preview = self._cb_object.get_preview()
-        if preview:
-            self.props.secondary_text = GLib.markup_escape_text(preview)
+        self._update_preview()
         self._update_items_visibility()
         self._update_open_submenu()
 
+    def _update_preview(self):
+        preview = self._cb_object.get_preview()
+        if isinstance(preview, str):
+            self.props.secondary_text = GLib.markup_escape_text(preview)
+        elif isinstance(preview, GdkPixbuf.Pixbuf):
+        	self.props.secondary_text = GLib.markup_escape_text(_('Image'))
+        	self.set_pixbuf(preview)
+
     def _open_item_activate_cb(self, menu_item):
         logging.debug('_open_item_activate_cb')
         percent = self._cb_object.get_percent()

src/jarabe/frame/clipboardobject.py

@@ -77,6 +77,11 @@ def get_preview(self):
         for mime_type in ['text/plain']:
             if mime_type in self._formats:
                 return self._formats[mime_type].get_data()
+
+        for mime_type in ['image/x-pixbuf']:
+            if mime_type in self._formats:
+                return self._formats[mime_type].get_data()
+
         return ''
 
     def is_bundle(self):