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C++跟QML的交互之配置类的应用

2024-07-04 08:29:57   222人阅读

如何在QML中使用我们的自定义的配置类,程序运行截图: 其中Text对象所显示的文本"fuzhou"就是从配置类中获取.

1. 自定义配置类qxSetting

class qxSetting : public QObject
{
    Q_OBJECT
public:
    qxSetting(QObject* parent = 0 ):QObject(parent){};
public slots:
    void setValue( const QString& key , const QString& value );
    QString getValue( const QString& key );
private:
    QMap<QString,QString> mMap_;
};


//========== 实现qxSetting.cpp ====================
void qxSetting::setValue(const QString &key, const QString &value)
{
    this->mMap_.insert(key,value);
}

QString qxSetting::getValue(const QString &key){
    return this->mMap_.value(key);
}

注意: QML中只能调用类的槽函数

2. 在QML中使用

 

qxSetting d ;
d.setValue("name","fuzhou");

QQmlApplicationEngine* engine = new QQmlApplicationEngine();

//注册
engine->rootContext()->setContextProperty("settings",&d);

完整的main.cpp

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qxSetting d ;
    d.setValue("name","fuzhou");

    QQmlApplicationEngine* engine = new QQmlApplicationEngine();
    engine->rootContext()->setContextProperty("settings",&d);

    engine->load(QUrl(QStringLiteral("qrc:///main.qml")));
//    QQmlComponent cm(engine ,QUrl(QStringLiteral("qrc:///main.qml")) );
//    cm.create();



    return app.exec();
}

 

附带的qml代码（包含2个qml文件)

=> main.qml 主文件
import QtQuick 2.1
import QtQuick.Window 2.1
Window {
    id:mainwin
    visible: true
    width: 360
    height: 360

    ContactModel{
        Text{
            property bool isHide : false

            id: textid
            anchors.centerIn: parent
            text:settings.getValue("name")

            focus: true
            Keys.onSpacePressed: {
                if( isHide == false)
                    hideParent()
                else{
                    parent.border.color = "lightsteelblue";
                    isHide = false;
                }
            }

            function hideParent(){
                parent.border.color = "white";
                isHide = true;
            }
        }
    }

   ContactModel{
       Rectangle{
           color: "green"
           anchors.centerIn: parent
           width : 40
           height: 40
       }

   }

}

//========================================
//自定义组件 ContactModel.qml
import QtQuick 2.0

Rectangle{
    id: boradRect
    width : 80 ; height: 80
    border.color: "lightsteelblue"
    border.width: 4
    radius : 8



    MouseArea{
        anchors.fill: boradRect
        drag.target: boradRect
        drag.axis:  drag.XAndYAxis
    }

}
View Code

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