# HG changeset patch
# User Goffi <goffi@goffi.org>
# Date 1471892211 -7200
# Node ID f3940f6a322247dd78a91108678a6fa45bf2d78b
# Parent  2e948c2286435242b79647a05aeab0c5d932adab
quick frontend (widgets): a deletion with onDelete can now be cancelled if onDelete return False

diff -r 2e948c228643 -r f3940f6a3222 frontends/src/quick_frontend/quick_widgets.py
--- a/frontends/src/quick_frontend/quick_widgets.py	Sun Aug 21 20:39:43 2016 +0200
+++ b/frontends/src/quick_frontend/quick_widgets.py	Mon Aug 22 20:56:51 2016 +0200
@@ -253,9 +253,14 @@
     def deleteWidget(self, widget_to_delete):
         """Delete a widget
 
+        this method must be called by frontends when a widget is deleted
         widget's onDelete method will be called before deletion
         """
-        widget_to_delete.onDelete()
+        if widget_to_delete.onDelete() == False:
+            return
+
+        if self.host.selected_widget == widget_to_delete:
+            self.host.selected_widget = None
 
         for widget_map in self._widgets.itervalues():
             to_delete = set()
@@ -335,8 +340,11 @@
         return unicode(target) # by defaut, there is one hash for one target
 
     def onDelete(self):
-        """Called when a widget is deleted"""
-        log.debug(u"deleting widget {}".format(self)) # Must be implemented by frontends
-        if self.host.selected_widget == self:
-            self.host.selected_widget = None
+        """Called when a widget is being deleted
 
+        @return (boot, None): False to cancel deletion
+            all other value continue deletion
+        """
+        log.debug(u"widget {} deleted".format(self))
+        return True
+