Qt 窗口移动实现

#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 = 0);

        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(0,0,200,200);
    QMovie* mv = new QMovie("../a.PNG");
    label->setMovie(mv);
    //3秒后图片消失
    QTimer::singleShot( 3*1000, label, SLOT(close()));
    //图片移动
    label->move(200,200);

    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(60));
     // 重新设置图片大小
     *img = img->scaled(1000,1000,Qt::IgnoreAspectRatio);
#endif

#if 0
     QGraphicsBlurEffect *effect = new QGraphicsBlurEffect(this);
     effect->setBlurRadius(3);    //模糊值，值越大越模糊

     QGraphicsColorizeEffect *effect = new QGraphicsColorizeEffect(this);
     effect->setColor(QColor(0,200,0));//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(100,400);
     effect->setColor(QColor(20,20,20));
     effect->setBlurRadius(500);
#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()>1000 || e->pos().ry()>500)
        return ;
    last = e->globalPos();
}

//鼠标移动
void Widget::mouseMoveEvent(QMouseEvent *e)
{
    if(e->pos().rx()>1000 || e->pos().ry()>500)
        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()>1000 || e->pos().ry()>500)
        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(300,200,1000,500);
    w.show();

    return app.exec();
}