Qt SCXML 援引范例 (静态)

援引编译嵌套状态机。

Invoke Example (Static) 演示如何使用 <invoke> element with generated nested state-machines, where the SCXML file is compiled to a C++ class. 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>
					
					

编译状态机

We link against the Qt SCXML module by adding the following line to the invoke-static.pro 文件：

QT += qml scxml
					

接着，指定要编译的状态机：

STATECHARTS = ../invoke-common/statemachine.scxml
					

Qt SCXML 编译器 qscxmlc , is run automatically to generate statemachine.h and statemachine.cpp , and to add them to the HEADERS and SOURCES variables for compilation.

实例化状态机

We instantiate the generated 方向 类在 invoke-static.cpp 文件，如下：

#include "statemachine.h"
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    qmlRegisterType<Directions>("Directions", 1, 0, "Directions");
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/invoke-static.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;
    return app.exec();
}
					

范例工程 @ code.qt.io

内容

• 运行范例

• 援引状态机

• 编译状态机

• 实例化状态机