pose_view_widget.py 文件源码

def dragEnterEvent(self, event):
        if event.mimeData().hasText():
            topic_name = str(event.mimeData().text())
            if len(topic_name) == 0:
                qWarning('PoseViewWidget.dragEnterEvent(): event.mimeData() text is empty')
                return
        else:
            if not hasattr(event.source(), 'selectedItems') or len(event.source().selectedItems()) == 0:
                qWarning('PoseViewWidget.dragEnterEvent(): event.source() has no attribute selectedItems or length of selectedItems is 0')
                return
            item = event.source().selectedItems()[0]
            topic_name = item.data(0, Qt.UserRole)

            if topic_name is None:
                qWarning('PoseViewWidget.dragEnterEvent(): selectedItem has no UserRole data with a topic name')
                return

        # check for valid topic
        msg_class, self._topic_name, _ = get_topic_class(topic_name)
        if msg_class is None:
            qWarning('PoseViewWidget.dragEnterEvent(): No message class was found for topic "%s".' % topic_name)
            return

        # check for valid message class
        quaternion_slot_path, point_slot_path = self._get_slot_paths(msg_class)

        if quaternion_slot_path is None and point_slot_path is None:
            qWarning('PoseViewWidget.dragEnterEvent(): No Pose, Quaternion or Point data was found outside of arrays in "%s" on topic "%s".'
                     % (msg_class._type, topic_name))
            return

        event.acceptProposedAction()