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gif图很大，不好上传，就上传普通图片：

运行截图如下：

源码如下：

blureffect.h

#ifndef BLUREFFECT_H#define BLUREFFECT_H#include 
   
    QT_BEGIN_NAMESPACEclass QGraphicsItem;QT_END_NAMESPACEclass BlurEffect : public QGraphicsBlurEffect{public:    BlurEffect(QGraphicsItem *item);    void setBaseLine(const qreal y);    void draw(QPainter *painter)Q_DECL_OVERRIDE;private:    void adjustForItem();    qreal m_baseLine;    QGraphicsItem *m_item;};#endif // BLUREFFECT_H
   

mygraphicsview.h

#ifndef MYGRAPHICSVIEW_H#define MYGRAPHICSVIEW_H#include 
   
    class MyGraphicsView : public QGraphicsView{    Q_OBJECTpublic:    explicit MyGraphicsView(QWidget *parent = 0);protected:    void keyPressEvent(QKeyEvent *event)Q_DECL_OVERRIDE;signals:    void sendDelta(int delta);};#endif // MYGRAPHICSVIEW_H
   

widget.h

#ifndef WIDGET_H#define WIDGET_H#include 
   
    QT_BEGIN_NAMESPACEclass QGraphicsScene;class QGraphicsItem;class QPropertyAnimation;QT_END_NAMESPACEnamespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECT    Q_PROPERTY(qreal index READ index WRITE setIndex)public:    explicit Widget(QWidget *parent = 0);    ~Widget();    qreal index()const;    void setIndex(const qreal index);protected slots:    void animationRun(int delta);private:    Ui::Widget *ui;    QGraphicsScene *m_scene;    QList
    
      m_icons;    QPropertyAnimation *m_animation;    qreal m_index;};#endif // WIDGET_H
    
   

blureffect.cpp

#include "blureffect.h"#include 
   
    #include 
    
     BlurEffect::BlurEffect(QGraphicsItem *item)    :QGraphicsBlurEffect()    ,m_baseLine(200),m_item(item){}void BlurEffect::setBaseLine(const qreal y){    m_baseLine=y;}void BlurEffect::draw(QPainter *painter){    adjustForItem();    QGraphicsBlurEffect::draw(painter);}void BlurEffect::adjustForItem(){    qreal y=m_baseLine-m_item->pos().y();    qreal radius=qBound(qreal(0.0),y/32,qreal(16.0));    setBlurRadius(radius);}
    
   

main.cpp

#include "widget.h"#include 
   
    int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();    return a.exec();}
   

mygraphicsview.cpp

#include "mygraphicsview.h"#include 
   
    #include 
    
     MyGraphicsView::MyGraphicsView(QWidget *parent)    : QGraphicsView(parent){}void MyGraphicsView::keyPressEvent(QKeyEvent *event){    int delta=0;    switch(event->key()){    case Qt::Key_Left:        delta=-1;        break;    case Qt::Key_Right:        delta=1;        break;    default:        break;    }    emit sendDelta(delta);}
    
   

wiget.cpp

#include "widget.h"#include "ui_widget.h"#include "blureffect.h"#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             #ifndef M_PI#define M_PI 3.14159265358979323846#endifWidget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ ui->setupUi(this); ui->graphicsView->setStyleSheet("background: transparent;border:0px"); ui->graphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); ui->graphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); ui->graphicsView->setRenderHints(ui->graphicsView->renderHints()|QPainter::Antialiasing|QPainter::SmoothPixmapTransform); setWindowFlags(Qt::Window|Qt::FramelessWindowHint); setAttribute(Qt::WA_TranslucentBackground); setWindowState(Qt::WindowMaximized); m_index=0.0; m_scene=new QGraphicsScene; ui->graphicsView->setScene(m_scene); QStringList fileList; for(int i=0;i<10;i++){ fileList<<":/img/"+QString::number(i+1)+".png"; } for(int i=0;i
             
              addPixmap(pixmap); icon->setZValue(1); icon->setGraphicsEffect(new BlurEffect(icon)); m_icons<
              
               setDuration(400); m_animation->setEasingCurve(QEasingCurve::InOutSine); ui->graphicsView->setRenderHint(QPainter::Antialiasing,true); connect(ui->graphicsView,SIGNAL(sendDelta(int)),this,SLOT(animationRun(int))); thread()->setPriority(QThread::TimeCriticalPriority);}Widget::~Widget(){ delete ui;}qreal Widget::index() const{ return m_index;}void Widget::setIndex(const qreal index){ m_index=index; qreal baseline=0; for(int i=0;i
               
                setPos(pos); baseline=qMax(baseline,ys); static_cast
                
                 (icon->graphicsEffect())->setBaseLine(baseline); } m_scene->update();}void Widget::animationRun(int delta){ if(m_animation->state()==QAbstractAnimation::Stopped&&delta){ m_animation->setEndValue(m_index+delta); m_animation->start(); }}
                
               
              
             
            
           
          
         
        
       
      
     
    
   

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