qml与c++混合编程之简单demo说明

最近接触QML，感觉非常kuo，demo中实现一个按键，名为Open，功能就是打开文件，很简单。打开过程是c++干事，界面是QML写的。

qml与c++混合编程不清楚的，可以看我前面一篇文档。

file.h

#ifndef FILE_H

#define FILE_H

#include <QObject>

class test_file: public QObject

{

    Q_OBJECT

public:

    explicit test_file(QObject *parent = 0);

signals:

    void someSignal();

public slots:

    void on_actionOpen_triggered(); // 打开文件菜单

};

#endif // FILE_H

on_actionOpen_triggered();是槽函数，还得有个signals函数；

file.cpp

#include "file.h"
#include "QDebug"
#include <QtWidgets/QFileDialog>
test_file::test_file(QObject *parent):
    QObject(parent)
{
}

void test_file::on_actionOpen_triggered()// 打开文件菜单

{

    QString fileName = QFileDialog::getOpenFileName(); // 获取文件路径

    emit someSignal();

    qDebug()<<fileName;

}

main.cpp

#include "mainwindow.h"

#include <QApplication>

#include <QQmlApplicationEngine>

#include <QQmlContext>

#include <QQmlEngine>

#include <QtQml>

#include "file.h"

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    QQmlApplicationEngine engine;

    test_file f;

    engine.load(QUrl(QStringLiteral("qrc:/edit/main.qml")));

    engine.load(QUrl(QStringLiteral("qrc:/edit/Buttons.qml")));

    engine.rootContext()->setContextProperty("FILE_USER",&f);

    return a.exec();

}

main.qml

import QtQuick 2.0

import QtQuick.Controls 1.1

ApplicationWindow {

    id: aw

    visible: true

    width: 900

    height: 900

    title: qsTr("edit")

Rectangle {

    width: 600

    height: 600

    color: "#609ca0"

    Rectangle{//按钮

        x:50;y:40

        Buttons{

            anchors.horizontalCenter: parent.horizontalCenter

            text: "Open"

             onClick.onClicked:FILE_USER.on_actionOpen_triggered()

        }

    }

  }

}

Buttons.qml

import QtQuick 2.0

Rectangle {

    id:button_type

    property alias onClick:ma

    property alias text: textElement.text;

    width: 90; height: 40

    border.color: "steelblue";border.width:2

    radius: 8

    Text {

        id: textElement

        anchors.centerIn: parent

        font.pointSize: 25

        style: Text.Raised; 

    }

    MouseArea{

        id: ma

        anchors.fill: parent

}

}