#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

#include <QPoint>

#include <QMouseEvent>  //引用鼠标类头文件

class Widget : public QWidget

{

    Q_OBJECT

public:

    explicit Widget(QWidget *parent = );

        QPoint last;

    //鼠标按下

    void mousePressEvent(QMouseEvent *e);

    //鼠标移动

    void mouseMoveEvent(QMouseEvent *e);

    //鼠标释放

    void mouseReleaseEvent(QMouseEvent *e);

signals:

public slots:

};

#endif // WIDGET_H

#include "Widget.h"

#include <QApplication>

#include <QLabel>

#include <QTimer>

#include <QMovie>

#include <QImage>

#include <QGraphicsBlurEffect>        //模糊效果

#include <QGraphicsColorizeEffect>    //着色效果

#include <QGraphicsDropShadowEffect>  //阴影效果

#include <QGraphicsOpacityEffect>     //透明效果

Widget::Widget(QWidget *parent) : QWidget(parent)

{

    QLabel* label = new QLabel(this);

#if 0

    label->setGeometry(,,,);

    QMovie* mv = new QMovie("../a.PNG");

    label->setMovie(mv);

    //3秒后图片消失

    QTimer::singleShot( *, label, SLOT(close()));

    //图片移动

    label->move(,);

    mv->start();

#endif

     QImage *img = new QImage;

     img->load("../a.PNG");         //QImage 加载图片

#if 0

     //水平翻转

     *img = img->mirrored(true,false);

      //垂直翻转

     *img = img->mirrored(false,true);

     //旋转60度角

     QMatrix matrix;

     *img = img->transformed(matrix.rotate());

     // 重新设置图片大小

     *img = img->scaled(,,Qt::IgnoreAspectRatio);

#endif

#if 0

     QGraphicsBlurEffect *effect = new QGraphicsBlurEffect(this);

     effect->setBlurRadius();    //模糊值，值越大越模糊

     QGraphicsColorizeEffect *effect = new QGraphicsColorizeEffect(this);

     effect->setColor(QColor(,,));//着色

     QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect(this); //设定透明值

     effect->setOpacity(0.5);//透明效果

     /*

     OuterGlowBitmapEffect（外发光）

     DropShadowBitmapEffect（阴影）

     EmbossBitmapEffect（浮雕）

     BlurBitmapEffect（模糊）

     BevelBitmapEffect（斜角）。

     */

#endif

#if 1

     QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect(this);

     //设定阴影

     effect->setOffset(,);

     effect->setColor(QColor(,,));

     effect->setBlurRadius();

#endif

     label->setGraphicsEffect(effect);//设置label效果

     label->setPixmap(QPixmap::fromImage(*img));//把图片加载到label

}

//鼠标按下

void Widget::mousePressEvent(QMouseEvent *e)

{

    if(e->pos().rx()> || e->pos().ry()>)

        return ;

    last = e->globalPos();

}

//鼠标移动

void Widget::mouseMoveEvent(QMouseEvent *e)

{

    if(e->pos().rx()> || e->pos().ry()>)

        return ;

    int dx = e->globalX() - last.x();

    int dy = e->globalY() - last.y();

    last = e->globalPos();

    move(x()+dx,y()+dy);

}

//鼠标释放

void Widget::mouseReleaseEvent (QMouseEvent *e)

{

    if(e->pos().rx()> || e->pos().ry()>)

        return ;

        int dx = e->globalX() - last.x();

        int dy = e->globalY() - last.y();

        move(x()+dx, y()+dy);

}

int main(int argc,char** argv)

{

    QApplication app(argc,argv);

    Widget w;

     //去掉标题栏

    w.setWindowFlags(Qt::FramelessWindowHint);

    //设置背景透明

    //w.setAttribute(Qt::WA_TranslucentBackground, true);

    //固定大小

    w.setGeometry(,,,);

    w.show();

    return app.exec();

}