内容

• 运行范例
• 援引状态机
• 动态加载状态机

Qt SCXML 援引范例 (动态)

援引动态加载嵌套状态机。

Invoke Example (Dynamic) 演示如何使用 <invoke> element with generated nested state-machines, where the SCXML file is dynamically loaded. The <invoke> element is used to create an instance of an external service.

运行范例

要运行范例从 Qt Creator ，打开 欢迎 模式，然后选择范例从 范例 。更多信息，拜访 构建和运行范例 .

援引状态机

在 statemachine.scxml , we specify a state machine with the name 方向 类型 http://www.w3.org/TR/scxml/ to invoke:

<scxml
    xmlns="http://www.w3.org/2005/07/scxml"
    version="1.0"
    name="Directions"
    initial="anyplace"
>
    <state id="anyplace">
        <transition event="goNowhere" target="nowhere"/>
        <transition event="goSomewhere" target="somewhere"/>
        <state id="nowhere"/>
        <state id="somewhere">
            <invoke type="http://www.w3.org/TR/scxml/">
                <content>
                    <scxml name="anywhere" version="1.0">
                        <state id="here">
                            <transition event="goThere" target="there"/>
                        </state>
                        <state id="there">
                            <transition event="goHere" target="here"/>
                        </state>
                    </scxml>
                </content>
            </invoke>
        </state>
    </state>
</scxml>
					

动态加载状态机

We link against the Qt SCXML module by adding the following line to the project build files.

With qmake to the invoke-dynamic.pro

QT += qml scxml
					

With cmake to the CMakeLists.txt

find_package(Qt6 COMPONENTS Core Gui Qml Scxml)
target_link_libraries(invoke-dynamic PUBLIC
    Qt6::Core
    Qt6::Gui
    Qt6::Qml
    Qt6::Scxml
)
					

We dynamically create the state machine, as follows:

import QtScxml
MainView {
    stateMachine: directions.stateMachine
    StateMachineLoader {
        id: directions
        source: "qrc:///statemachine.scxml"
    }
					

范例工程 @ code.qt.io