def mouseReleaseEvent(self, event):
if self.tmp_link_item:
self.force_link_dialog = bool(event.modifiers() & Qt.ShiftModifier)
item = self.target_node_item_at(event.scenePos())
node = None
stack = self.document.undoStack()
self.macro = QUndoCommand(self.tr("Add link"))
if item:
# If the release was over a node item then connect them
node = self.scene.node_for_item(item)
else:
# Release on an empty canvas part
# Show a quick menu popup for a new widget creation.
try:
node = self.create_new(event)
except Exception:
log.error("Failed to create a new node, ending.",
exc_info=True)
node = None
if node is not None:
commands.AddNodeCommand(self.scheme,
node,
parent=self.macro)
if node is not None:
if self.direction == self.FROM_SOURCE:
source_node = self.scene.node_for_item(self.source_item)
sink_node = node
else:
source_node = node
sink_node = self.scene.node_for_item(self.sink_item)
self.suggestions.set_direction(self.direction)
self.connect_nodes(source_node, sink_node)
if not self.isCanceled() or not self.isFinished() and \
self.macro is not None:
# Push (commit) the add link/node action on the stack.
stack.push(self.macro)
self.end()
else:
self.end()
return False
