QWidget和QML交互，通过元对象函数和单例模式及信号中转类

#include "widget.h" #include "ui_widget.h" #include<QQuickItem> Widget* Widget::p_Instance=NULL; QMutex Widget::m_mutex; Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); } Widget *Widget::GetInstance() { if(Q_NULLPTR==p_Instance) { m_mutex.lock(); if(Q_NULLPTR==p_Instance) { p_Instance=new Widget(); m_mutex.unlock(); } } return p_Instance; } Widget::~Widget() { delete ui; if(Q_NULLPTR!=p_Instance) { delete p_Instance; } } void Widget::on_pushButton_clicked() { QUrl source("qrc:/qmlTest.qml"); ui->quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView ); ui->quickWidget->setSource(source); ui->quickWidget->setClearColor(QColor(Qt::transparent)); QQuickItem *item=ui->quickWidget->rootObject(); connect(item,SIGNAL(sendToWidget(QString)),this,SLOT(qmlToWidgetSlot(QString))); // connect(this,SIGNAL(sendSignalToXml(QString)),item,SIGNAL(receFromWidget(QString))); //1.................. } void Widget::on_pushButton_2_clicked() { emit sendSignalToXml(ui->lineEdit->text()); //信号 //1.................. //2.................. 两种方法都需要发送信号 //C++调用QML方法 // QQuickItem *item=ui->quickWidget->rootObject(); //3.................. // if(item) // QMetaObject::invokeMethod(item,"load",Q_ARG(QVariant,ui->lineEdit->text())); } void Widget::qmlToWidgetSlot(const QString &str) { ui->lineEdit->setText(str); }