qml - 从 C++ 访问动态 QML 对象

Question

有人知道如何从 C++ 访问和存储动态创建的 QML 对象吗？我使用 Qt Site 上建议的以下代码来创建动态 QML 对象并尝试将它们存储在QML 列表类型中

    property list<Button> listButtons: [
        Button{ }
    ]
    function addButton(buttonname) {
        console.log("Creating Pin: "+buttonname)
        var component = Qt.createComponent("Button.qml");
        if (component.status == Component.Ready)
        {
            var newbutton = component.createObject(node);
            newbutton.x = 20;
            newbutton.y = 30;
            listButtons.append(newbutton) //I get a error here: listButtons.append [undefined] is not a function
        }
        else
        {
            console.log("Unable to create button: "+buttonname)
        }
     }

谢谢你。

简历

Answer 1

有关于此的文档。http://doc.qt.nokia.com/4.7/qml-list.html

为此，您需要将数组实现为列表

import QtQuick 1.0
import "script.js" as JsScript

Rectangle {
    width: 360
    height: 360

    function getList(){
        return JsScript.array;
    }

    Text {
        anchors.centerIn: parent
        text: "Hello World"
    }
    Item {
     Component.onCompleted: {
         console.log('complemented');
         JsScript.addItem('abc')
         console.log("Added:", JsScript.array[0])
     }
    }
}

脚本.js

var array = new Array();

function  getArray(){
    return array;
}
    function addItem(item) {
     array.push(item)
    }

来自 C++

QDeclarativeEngine engine;
QDeclarativeComponent component(&engine, "MyItem.qml");
QObject *object = component.create();

QVariant returnedValue;
QVariant msg = "Hello from C++";
QMetaObject::invokeMethod(object, "myQmlFunction",
     Q_RETURN_ARG(QVariant, returnedValue),
     Q_ARG(QVariant, msg));

returnedValue.toList();

未经测试的代码。嗯，我不确定这一点。但也许 QVariant.toList() 会工作，也可能不会。你必须尝试。