本文共 7272 字，大约阅读时间需要 24 分钟。

目录

理论及程序运行

这里要注意，通过qmlRegisterType函数去注册一个QML类！

下面再指明一个关键的问题，如何把QML界面的对象映射到C++呢！

可以有如下的处理：

通过这个函数：

QObject *pRoot = (QObject*)ui->quickWidget->rootObject();

还有几种方法：

注册的QML类也是具有QObject和元对象的性质的：

通过设置ObjectName（这个要唯一）

C++映射的时候通过

qDebug() << list[4]->objectName();

即可映射成功！

程序运行截图如下：

源码

文件结构如下：

源码如下：

getmsg.h

#ifndef GETMSG_H#define GETMSG_H#include 
   
    class GetMsg : public QObject{    Q_OBJECT    Q_PROPERTY(QString text READ text WRITE setText)public:    GetMsg(QObject *parent = 0);    QString text() const;    void setText(const QString &text);signals:    void textChanged(QString str);private:    QString m_text;};#endif // GETMSG_H
   

widget.h

#ifndef WIDGET_H#define WIDGET_H#include 
   
    class GetMsg;namespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();protected:    void getMsgInfo();protected slots:    void textChanged(const QString &str);private:    Ui::Widget *ui;    GetMsg *m_data;};#endif // WIDGET_H
   

getmsg.cpp

#include "getmsg.h"#include 
   
    GetMsg::GetMsg(QObject *parent) : QObject(parent){    m_text = "";}QString GetMsg::text() const{    return m_text;}void GetMsg::setText(const QString &text){    m_text = text;    emit textChanged(m_text);}
   

main.cpp

#include "widget.h"#include 
   
    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 "getmsg.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ ui->setupUi(this); //registartion qmlRegisterType
         
          ("GetMsg", 1, 0, "GetMsg"); ui->quickWidget->setSource(QUrl("qrc:/main.qml")); this->setWindowTitle("CSDN IT1995"); QObject *pRoot = (QObject*)ui->quickWidget->rootObject(); const QObjectList list = pRoot->children(); m_data = static_cast
          
           (list[4]); qDebug() << list[4]->metaObject()->className(); qDebug() << list[4]->objectName(); connect(m_data, SIGNAL(textChanged(QString)), this, SLOT(textChanged(QString)));}Widget::~Widget(){ delete ui;}void Widget::getMsgInfo(){}void Widget::textChanged(const QString &str){ QString currentData = QDateTime::currentDateTime().toString("hh:mm:ss") + " "; currentData.append(str); ui->textEdit->append(currentData);}
          
         
        
       
      
     
    
   

main.qml

import QtQuick 2.4import GetMsg 1.0Item {    id: box    Rectangle{        id: redSquare        width: 240; height: 120        anchors.top: parent.top; anchors.left: parent.left; anchors.margins: 50        color: "red"        //opacity        Text{            text: "Click"            font.pixelSize: 16            anchors.centerIn: parent        }        MouseArea{            id: readSquareMouseArea            anchors.fill: parent            hoverEnabled: true            property string buttonID            //Value 'All.Buttons' is eqivalent to:            //'Qt::LeftButton | Qt::RightButton | Qt::MiddleButton  .... | Qt::ExtraButton24'            acceptedButtons: Qt.AllButtons            onPressed: {                if (mouse.button === Qt.LeftButton)                    buttonID = 'LeftButton'                else if (mouse.button === Qt.RightButton)                    buttonID = 'RightButton'                else if (mouse.button === Qt.MidButton)                    buttonID = 'MiddleButton'                else if (mouse.button === Qt.BackButton)                    buttonID = 'BackButton'                else if (mouse.button === Qt.ForwardButton)                    buttonID = 'ForwardButton'                else if (mouse.button === Qt.TaskButton)                    buttonID = 'TaskButton'                else if (mouse.button === Qt.ExtraButton4)                    buttonID = 'ExtraButton4'                else if (mouse.button === Qt.ExtraButton5)                    buttonID = 'ExtraButton5'                else if (mouse.button === Qt.ExtraButton6)                    buttonID = 'ExtraButton6'                else if (mouse.button === Qt.ExtraButton7)                    buttonID = 'ExtraButton7'                else if (mouse.button === Qt.ExtraButton8)                    buttonID = 'ExtraButton8'                else if (mouse.button === Qt.ExtraButton9)                    buttonID = 'ExtraButton9'                else if (mouse.button === Qt.ExtraButton10)                    buttonID = 'ExtraButton10'                else if (mouse.button === Qt.ExtraButton11)                    buttonID = 'ExtraButton11'                else if (mouse.button === Qt.ExtraButton12)                    buttonID = 'ExtraButton12'                else if (mouse.button === Qt.ExtraButton13)                    buttonID = 'ExtraButton13'                else if (mouse.button === Qt.ExtraButton14)                    buttonID = 'ExtraButton14'                else if (mouse.button === Qt.ExtraButton15)                    buttonID = 'ExtraButton15'                else if (mouse.button === Qt.ExtraButton16)                    buttonID = 'ExtraButton16'                else if (mouse.button === Qt.ExtraButton17)                    buttonID = 'ExtraButton17'                else if (mouse.button === Qt.ExtraButton18)                    buttonID = 'ExtraButton18'                else if (mouse.button === Qt.ExtraButton19)                    buttonID = 'ExtraButton19'                else if (mouse.button === Qt.ExtraButton20)                    buttonID = 'ExtraButton20'                else if (mouse.button === Qt.ExtraButton21)                    buttonID = 'ExtraButton21'                else if (mouse.button === Qt.ExtraButton22)                    buttonID = 'ExtraButton22'                else if (mouse.button === Qt.ExtraButton23)                    buttonID = 'ExtraButton23'                else if (mouse.button === Qt.ExtraButton24)                    buttonID = 'ExtraButton24'                info.text = 'Press (' + buttonID + ' shift = '                        + (mouse.modifiers & Qt.ShiftModifier ? 'true' : 'false') + ")"                var posInBox = redSquare.mapToItem(box, mouse.x, mouse.y)                posInfo.text = '红色方框内坐标: ' + mouse.x + ',' +mouse.y + '\n'                               + 'quickwidgets窗口坐标: ' +  + posInBox.x + ' ,' +posInBox.y                data.text = info.text + '\n' + posInfo.text;            }            onReleased: {                btn.text = 'Released (isClick = ' + mouse.isClick + ' wasHeld = ' + mouse.wasHeld + ')'                posInfo.text = ''            }            onPressAndHold: btn.text = 'Press and hold'            onClicked: btn.text = 'Clicked (wasHeld=' + mouse.wasHeld + ')'            onDoubleClicked: btn.text = 'Double clicked'        }    }    Text{        id: posInfo        anchors.bottom: parent.bottom        anchors.horizontalCenter: parent.horizontalCenter        anchors.margins: 20    }    Text{        id: btn        anchors.bottom: posInfo.top        anchors.horizontalCenter: parent.horizontalCenter        anchors.margins: 20    }    Text{        id: info        anchors.bottom: btn.top        anchors.horizontalCenter: parent.horizontalCenter        anchors.margins: 20    }    GetMsg{        objectName: 'GetInfo'        id: data    }}

widget.ui的界面是这样的：

转载地址：https://it1995.blog.csdn.net/article/details/86003460 如侵犯您的版权，请留言回复原文章的地址，我们会给您删除此文章，给您带来不便请您谅解！