def show_contextmenu(self, pos: QPoint):
menu = QMenu(self)
index = self.currentIndex()
node = index.internalPointer()
# insert item and node
menu.addAction(self.insertitemAction)
menu.addAction(self.insertnodeAction)
# edit key
if isinstance(node, (JsonNode, JsonItem)):
menu.addSeparator()
menu.addAction(self.editkeyAction)
if isinstance(node, JsonItem):
menu.addAction(self.editAction)
self.editAction.setEnabled(not node.readonly)
# remove
if isinstance(node, (JsonNode, JsonItem)):
menu.addSeparator()
menu.addAction(self.removeitemAction)
# properties
if isinstance(node, JsonItem):
menu.addSeparator()
menu.addAction(self.propertiesAction)
menu.setDefaultAction(self.propertiesAction)
menu.popup(self.viewport().mapToGlobal(pos), self.editAction)
