qglwidget如何与主窗口中的其他小部件交互

Question

基本上我想在Text Edit小部件上显示按下的按钮。Key事件正在为GLWidget工作。如何从GLWidget中与MainWindow的小部件交互?这是目前为止的代码，

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::on_startButton_clicked()
{
}

glwidget.h

#ifndef GLWIDGET_H
#define GLWIDGET_H
#include <QTimer>
#include <QtOpenGL/QGLWidget>
#include <gl/GLU.h>
#include <gl/GL.h>
#include <QKeyEvent>

class GLWidget : public QGLWidget
{
    Q_OBJECT
public:
    explicit GLWidget(QWidget *parent = 0);
    ~GLWidget();
protected:
    void initializeGL();
    void paintGL();
    void resizeGL(int w, int h);
    //--------------( Key Event )-----------------//
    void keyPressEvent(QKeyEvent *event);
    void keyReleaseEvent(QKeyEvent *event);
private:
    QTimer timer;
};
#endif // GLWIDGET_H

glwidget.cpp

.
.
.    
void GLWidget::keyPressEvent(QKeyEvent *event)
{
   qDebug() << event->text() << " is pressed ...";
}
void GLWidget::keyReleaseEvent(QKeyEvent * event)
{
    qDebug() << event->text() << " is released ...";
     //ui->textEdit->setText("hhh"); <- ????????????????
}

Answer 1

您可以像使用其他小部件一样使用它。

在你的GLWidget中放一个信号，当键被释放时发出

class GLWidget : public QGLWidget
{
    ....
signals:
    void textChanged(QString text); 
}
void GLWidget::keyReleaseEvent(QKeyEvent * event)
{
    qDebug() << event->text() << " is released ...";
    emit textChanged(event->text());
}

并将此信号连接到您的textEdit插槽setText(const QString & text)。