是否可以从C ++创建Qml组件?

时间:2018-05-09 19:07:14

标签: c++ qt qml qt5 qqmlcomponent

有没有办法从C ++创建/附加QML组件?

例如,如果我有这个QML:

Window {
    id: window
    objectName: "windowName"
    title: "windowName"
    width: 480
    height: 800

    Rectangle {
        id: frmHeader
        objectName: "frmHeader"
        width: parent.width
        height: parent.height
    }
}

是否可以在Rectangle上附加TextInput

1 个答案:

答案 0 :(得分:2)

在您的情况下,您应该按照以下步骤操作:

  • 通过findChild使用objectName查找项目。

  • 使用QQmlComponent创建项目

  • parent添加为属性。

<强>的main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlComponent>
#include <QQmlProperty>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    QObject *frmHeader = engine.rootObjects().first()->findChild<QObject *>("frmHeader");
    QQmlComponent component(&engine);
    component.setData("import QtQuick 2.7 \n"
                      "TextInput{ \n"
                      "text: \"hello world :D\" \n"
                      "}", QUrl());
    QObject *text_object = component.create();
    if(text_object && frmHeader)
        Q_ASSERT(QQmlProperty::write(text_object,
                                     "parent",
                                     QVariant::fromValue(frmHeader)));

    return app.exec();
}