Qt Quick - Loader QML Type

资料来源：http://doc.qt.io/qt-5/qml-qtquick-loader.html

Receiving signals from loaded objects

接受来自加载对象的信号

main.qml:

import QtQuick 2.6
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        width: 200
        height: 200
        color: "#f5f5f5"

        Loader {
            id: pageLoader
            source: "Page1.qml"
        }

        Connections {
            target: pageLoader.item
            onMessage: console.log(msg)
        }
    }
}

Page1.qml:

import QtQuick 2.0

Rectangle {
    id: page
    signal message(string msg)

    width: 100; height: 100; color: "red"

    MouseArea {
        anchors.fill: parent
        onClicked: page.message("clicked!")
    }
}

效果图:

效果：

点击红色区域，会输出：“qml: clicked!”的信息。