Qt——屏保小球

dialog.h:

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include<QTimerEvent>

#include<QLabel>

#include<QMouseEvent>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

private:

    Ui::Dialog *ui;

    int x,y;

    int dx,dy;

protected:

    void mousePressEvent(QMouseEvent *e);

    void timerEvent(QTimerEvent *event);

    int mclock;

};

#endif // DIALOG_H

dialog.cpp:

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    dx=dy=1;

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::mousePressEvent(QMouseEvent *e)

{

    if(e->button()==Qt::LeftButton)

    {

        mclock=this->startTimer(20);

    }

    else if(e->button()==Qt::RightButton)

    {

        this->killTimer(mclock);

    }

}

 void  Dialog::timerEvent(QTimerEvent *event)

 {

     x=ui->ball->x();

     y=ui->ball->y();

     if(x==800) dx=0;

     else if(x==0) dx=1;

     if(y==600) dy=0;

     else if(y==0) dy=1;

     if(dx)x+=10;

     else x-=10;

     if(dy)y+=10;

     else y-=10;

     ui->ball->move(x,y);

 }

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