要导入 QML 类型到应用程序中，使用以下 import 语句在 .qml 文件中：
import QtQml.StateMachine
更多信息，见 Qt State Machine QML 指南 .
| FinalState | 提供最终状态 |
| HistoryState | Type provides a means of returning to a previously active substate |
| QAbstractState | Type is the base type of States of a StateMachine |
| QAbstractTransition | Type is the base type of transitions between QAbstractState objects |
| QSignalTransition | Type provides a transition based on a Qt signal |
| SignalTransition | Type provides a transition based on a Qt signal |
| State | Provides a general-purpose state for StateMachine |
| StateMachine | Provides a hierarchical finite state machine |
| TimeoutTransition | Type provides a transition based on a timer |
