Cancel obsolete rendering task during start up. This may reduce time when starting from journal.

1 files changed, 4 insertions, 3 deletions

diff --git a/ep_page_zoom.py b/ep_page_zoom.py
index 3d62ce1..1147296 100644
--- a/ep_page_zoom.py
+++ b/ep_page_zoom.py
@@ -93,7 +93,7 @@ class ZoomController(object):
 #        ka_debug.info('on_notebook_switch_page %s' % (args[2]))
         self._my_page = args[2] == _ZOOM_PAGE_NUMBER
 
-    def task_render(self, *args, **kwargs):
+    def task_render(self, task, *args, **kwargs):
         """Render zoom view of protozoon.
         pre: len(args) == 4
         """
@@ -102,7 +102,7 @@ class ZoomController(object):
 #        ka_debug.info('task_render entry: ')
         self._surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
         ctx = cairo.Context(self._surface)
-        protozoon.render(ctx, width, height)
+        protozoon.render(task, ctx, width, height)
 #        ka_debug.info('task_render exit: ')
 
     def start_calculation(self, zoom_protozoon):
@@ -111,7 +111,8 @@ class ZoomController(object):
         if self._protozoon is not None:
             widget = self._widget_tree.get_widget('zoomarea')
             task = ka_task.GeneratorTask(self.task_render,
-                                         self.on_zoom_completed)
+                                         self.on_zoom_completed,
+                                         'zoomarea')
             task.start(self._protozoon, -1,
                        widget.allocation.width, widget.allocation.height)
 #            ka_debug.info('start_calculation %ux%u for %s' %