def forward(self):
"""Signal handler for the Forward button."""
children = self.get_children()
if not len(children):
return
for child_id in children:
child_index = self.index[child_id]
child = self.model[child_index][treemodel.REVISION]
if same_branch(child, self.get_revision()):
self.set_revision(child)
break
else:
self.set_revision_id(children[0])
def back(self):
"""Signal handler for the Back button."""
parents = self.get_parents()
if not len(parents):
return
for parent_id in parents:
parent_index = self.index[parent_id]
parent = self.model[parent_index][treemodel.REVISION]
if same_branch(self.get_revision(), parent):
self.set_revision(parent)
break
else:
self.set_revision_id(parents[0])
