Qt: Implement child thread send signal parent thread toggle Picture

Code in Mainwindow.h

#ifndef Mainwindow_h
#define Mainwindow_h

#include <QMainWindow>
#include "Mythread.h"
Namespace Ui {
Class MainWindow;
}

Class Mainwindow:public Qmainwindow
{
Q_object
mythread* thread;
int count;
Public
Explicit MainWindow (Qwidget *parent = 0);
~mainwindow ();

Private Slots:
void on_pushbutton_clicked ();

Private
Ui::mainwindow *ui;
};

#endif//Mainwindow_h

Code in Mythread.h

#ifndef Mythread_h
#define Mythread_h
#include <QThread>
#include <QLabel>

Class Mythread:public Qthread
{
Q_object
Public
qlabel* label;
Overwrite the run () function in Qthread
void Run ()
{
Sleep (5);
Emit done ();//Send custom signal done
}

Signals:
void done ();//self-defined signal
};

#endif//Mythread_h

Main.cpp (generated automatically when created)

#include <QtGui/QApplication>
#include "Mainwindow.h"

int main (int argc, char *argv[])
{
Qapplication A (argc, argv);
MainWindow W;
W.show ();

return A.exec ();
}

Code in Mainwindow.cpp

#include "Mainwindow.h"
#include "Ui_mainwindow.h"

Mainwindow::mainwindow (Qwidget *parent):
Qmainwindow (parent),
UI (New Ui::mainwindow)
{
UI->SETUPUI (this);
thread = new mythread;//Create object
Thread->label = ui->label;
Count = 0;
Connect (thread,signal (done)), This,slot (on_pushbutton_clicked ()));//Signal capture
Thread->start ();//Sub-thread
}

Mainwindow::~mainwindow ()
{
Delete UI;
Delete thread;
}

void Mainwindow::on_pushbutton_clicked ()
{
The count++;//picture is displayed in the label
if (1 = = count)
Ui->label->setstylesheet ("Image:url (:/new/prefix1/image/1.jpeg);");
if (2 = = count)
Ui->label->setstylesheet ("Image:url (:/new/prefix1/image/2.jpeg);");
}

Qt: Implement child thread send signal parent thread toggle Picture