【Qt】Qt C++ Widget中嵌入qml

1. 效果

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2. 方法

使用QQuickWidget方式

	QQuickWidget *view = new QQuickWidget;
    view->setSource(QUrl::fromLocalFile("myqmlfile.qml"));
    view->show();

除了QQuickWidget方式还可以使用QQuickView方式，请自行查阅资料

3. 代码

3.1 工程目录

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3.2 pro文件

备注：需要添加 quickwidgets

QT       += core gui quickwidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    dialog.cpp

HEADERS += \
    dialog.h

FORMS += \
    dialog.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

DISTFILES +=

RESOURCES += \
    res.qrc

3.3 main.cpp

#include "dialog.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    w.show();
    return a.exec();
}

3.4 dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();

signals:
    cppClick();

public slots:
    void onQmlClick();

private slots:
    void on_pushButton_clicked();

private:
    Ui::Dialog *ui;
};
#endif // DIALOG_H

3.5 dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"
#include <QtQuickWidgets>


Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog)
{
    ui->setupUi(this);

    //c++向qml中传数据
    ui->quickWidget->rootContext()->setContextProperty("$color", "red");

    //qml导入
    QUrl source("qrc:/qmlFile.qml");
    ui->quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView);
    ui->quickWidget->setSource(source);
    ui->quickWidget->setClearColor(QColor(Qt::transparent));

    //qml与c++交互
    QQuickItem* qmlItem = ui->quickWidget->rootObject();
    connect(qmlItem, SIGNAL(qmlClick()), this, SLOT(onQmlClick()));
    connect(this, SIGNAL(cppClick()), qmlItem, SLOT(onCppClick()));
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::onQmlClick()
{
    qDebug() << "this is C++: qml's click";
}


void Dialog::on_pushButton_clicked()
{
    emit cppClick();
}

3.6 qmlFile.qml

import QtQuick 2.15
import QtQuick.Controls 2.15

Item {
    id: _mRoot

    signal qmlClick();

    function onCppClick()
    {
        console.log("this is qml: cpp's click")
    }

    Rectangle{
        width: 200
        height: 200
        color: $color
        border.color: "grey"
        border.width: 1

        Button{
            width: 100
            height: 50
            text: "qml button"
            anchors.centerIn: parent

            onClicked: {
                qmlClick();
            }
        }
    }
}