QObject的连接:::没有这样的信号:我如何继承和连接时连接不能识别信号的用户定义的位置?

问题描述 投票:-1回答:1

QT5不承认在我glwidget.h头,它是QOpenGLWidget的一个子类中定义的信号。

我已经改变了类的声明继承QObject的,而不是QWidget的,但是glwidget,在设计师创建,然后晋升为子类,如果不从QWidget的继承不会显示。

//////////////
//glwidget.h//
//////////////

#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QObject>
#include <QWidget>
#include <QOpenGLWidget>
#include <QMouseEvent>

class glwidget : public QOpenGLWidget
{

    Q_OBJECT

public:
    explicit glwidget(QWidget *parent = nullptr);

protected:
    void mouseMoveEvent(QMouseEvent *mouse_event);

signals:
    void sendMousePosition(QPoint& pos);

};

#endif // GLWIDGET_H
////////////////
//glwidget.cpp//
////////////////

#include "glwidget.h"

glwidget::glwidget(QWidget *parent) : QOpenGLWidget(parent)
{

    this->setMouseTracking(true);

}


void glwidget::mouseMoveEvent(QMouseEvent *mouse_event)
{
    QPoint mouse_pos = mouse_event->pos();

    if(mouse_pos.x() <= this->size().width() && \
       mouse_pos.y() <= this->size().height())
    {
        if (mouse_pos.x() >= 0 && mouse_pos.y() >= 0)
        {

            emit sendMousePosition(mouse_pos);

        }
    }
}
//////////////////
//mainwindow.cpp//
//////////////////

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), 
     ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QObject::connect(ui->openGLWidget_1,SIGNAL(sendMousePosition(Qpoint&)), \ 
                     this,SLOT(showMousePosition(QPoint&)));
}

void MainWindow::showMousePosition(QPoint &pos)
{
    ui->mouse_position_label->setText("x: " + QString::number(pos.x()) + \
                                      ", y: " +  QString::number(pos.y()));
}

子类鼠标事件正确注册,但即使清洁时,QMAKE和构建过程中运行,应用程序的输出:

QObject::connect: No such signal glwidget::sendMousePosition(Qpoint&)
QObject::connect:  (sender name:   'openGLWidget_1')
QObject::connect:  (receiver name: 'MainWindow')

期望的连接信号不被识别和注册。

qt widget signals subclassing slot
1个回答
0
投票

“这应该是QPoint而不是Qpoint” - 解决

© www.soinside.com 2019 - 2024. All rights reserved.