運行截圖如下：

源碼如下：

data.h

#ifndef DATA_H #define DATA_H#include <QObject>class Data : public QObject {Q_OBJECTQ_PROPERTY(QString text READ text WRITE setText)Q_PROPERTY(int size READ size WRITE setSize) public:Data(QObject *parent = 0);QString text() const;void setText(const QString name);int size() const;void setSize(const int age);signals:void textChanged(QString str);private:QString m_text;int m_size; };#endif // DATA_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>class Data;namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:Widget(QWidget *parent = 0);~Widget();protected:void getDataInfo();void textChange(const QString &str);private:Ui::Widget *ui;Data *m_data; };#endif // WIDGET_H

data.cpp

#include "data.h"Data::Data(QObject *parent) : QObject(parent) {m_text = "";m_size = 0; }QString Data::text() const {return m_text; }void Data::setText(const QString text) {m_text = text;emit textChanged(m_text); }int Data::size() const {return m_size; }void Data::setSize(const int size) {m_size = size; }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include "data.h"#include <QQmlEngine> #include <QQuickItem> #include <QQmlContext>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);//use after registartionqmlRegisterType<Data>("Data", 1, 0, "Data");ui->quickWidget->setSource(QUrl("qrc:/main.qml"));getDataInfo();connect(ui->lineEdit,static_cast<void(QLineEdit::*)(const QString&)>(&QLineEdit::textChanged),this,&Widget::textChange);connect(m_data,SIGNAL(textChanged(QString)),m_data,SIGNAL(qmltextChanged(QString))); }Widget::~Widget() {delete ui; }void Widget::getDataInfo() {QQuickItem *pRoot = ui->quickWidget->rootObject();Q_ASSERT(pRoot);qDebug() << pRoot->children();for(int i=0; i<pRoot->children().size();i++){QString className(pRoot->children()[i]->metaObject()->className());if(className.contains("Data")){m_data = qobject_cast<Data *>(pRoot->children()[i]);break;}}ui->lineEdit->setText(m_data->text()); }void Widget::textChange(const QString &str) {m_data->setText(str);}

main.qml

import QtQuick 2.0 import Data 1.0Item {Text {id: helloTexttext: qsTr("Hello world")color: "blue"font.pixelSize: 50font.family: "Times New Roman"anchors.centerIn: parentMouseArea {id: mouseAreaanchors.fill: parent}states: State {name: "down"when: mouseArea.pressed === truePropertyChanges {target: helloTextrotation : 360color: "red"}}transitions: Transition {from: ""to: "down"reversible: trueParallelAnimation {NumberAnimation { properties: "rotation"; duration: 500; easing.type: Easing.InOutQuad }ColorAnimation { duration: 500 }}}}Data {id: datatext: helloText.textsize: helloText.font.pixelSizesignal qmltextChanged(string text)onQmltextChanged: {helloText.text = text}}}

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總結

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