Qt QWidget 简约美观的加载动画 第四季

😊 第四季来啦 😊
效果如下:

只有三个文件,可以直接编译运行的

//main.cpp
#include "LoadingAnimWidget.h"
#include <QApplication>
#include <QVBoxLayout>
#include <QGridLayout>
int main(int argc, char *argv[])
{
   
    QApplication a(argc, argv);

    QWidget w;
    w.setWindowTitle("加载动画 第四季");
    QGridLayout * mainLayout = new QGridLayout;
    auto* anim1= new JellyInBox;
    mainLayout->addWidget(anim1,0,0);

    auto* anim2 = new HorizontalDNA;
    mainLayout->addWidget(anim2,0,1);

    auto * anim3 = new  LoopedRingWithText;
    mainLayout->addWidget(anim3,1,0);

    auto* anim4 = new Radar;
    mainLayout->addWidget(anim4,1,1);

    w.setLayout(mainLayout);
    w.show();
    anim1->start();
    anim2->start();
    anim3->start();
    anim4->start();
    return a.exec();
}

//LoadingAnimWidget.h
#ifndef LOADINGANIMWIDGET_H
#define LOADINGANIMWIDGET_H
#include <QPropertyAnimation>
#include <QWidget>
class LoadingAnimBase:public QWidget
{
   
    Q_OBJECT
    Q_PROPERTY(qreal angle READ angle WRITE setAngle)
public:
    LoadingAnimBase(QWidget* parent=nullptr);
    virtual ~LoadingAnimBase();

    qreal angle()const;
    void setAngle(qreal an);
public slots:
    virtual void exec();
    virtual void start();
    virtual void stop();
protected:
    QPropertyAnimation mAnim;
    qreal mAngle;
};

class JellyInBox:public LoadingAnimBase{
   //一个会伸缩的果冻在一个小盒子里面,一开始拉伸,然后移动,然后收缩
public:
    explicit JellyInBox(QWidget* parent = nullptr);
protected:
    void paintEvent(QPaintEvent *event);
};
class HorizontalDNA:public LoadingAnimBase{
   //两根水平方向的小球链,螺旋滚动,像DNA双分子链
public:
    explicit HorizontalDNA(QWidget* parent = nullptr);
protected:
    void paintEvent(QPaintEvent*);
private:
    void getPosYAlphaScale(const int amplitude,const qreal & offset,qreal & y,qreal & alpha,qreal & scale);
    //根据原始偏移获取当前时间点下的y轴坐标,透明度,和缩放比例
};
class LoopedRingWithText:public LoadingAnimBase{
   //外面有三圈圆环转动,中间有一个高亮的灯光从左向右移动照亮字符串的一部分
public:
    explicit LoopedRingWithText(QWidget* parent = nullptr);
protected:
    void paintEvent(QPaintEvent*);
};
class Radar:public LoadingAnimBase{
   //像一个雷达一样扫描,等待耗时操作的结束
public:
    explicit Radar(QWidget* parent = nullptr);
protected:
    void paintEvent(QPaintEvent*);
};

#endif // LOADINGANIMWIDGET_H

//LoadingAnimWidget.cpp
#include "LoadingAnimWidget.h"
#include <QDebug>
#include <QPaintEvent>
#include <QPainter>
#