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头文件

#pragma once

#include <QWidget>
#include <QTime>

class QPixmap;
class QTimer;

class MyRoundWidget : public QWidget
{
	Q_OBJECT

public:
	MyRoundWidget(QWidget *parent, int radius = 128);
	~MyRoundWidget();

	void showRount(int x, int y, const QSize &size, QString msg = QString());

protected:
	virtual void paintEvent(QPaintEvent *event) override;

private slots:
	void my_timer_timeout();

private:
	QPixmap *_pixmap;
	QTimer *_timer;
	QTime _startTime;

	QString _darwText;
	int _imageRotate;
	int _radius;
};

源文件：

#include "myroundwidget.h"

#include <QApplication>
#include <QPainter>
#include <QPixmap>
#include <QTimer>
#include <QFontMetrics>

MyRoundWidget::MyRoundWidget(QWidget *parent, int radius)
	: QWidget(parent), _imageRotate(0), _radius(radius)
{
	_pixmap = new QPixmap(":/images/rotating.png");

	_timer = new QTimer(this);
	connect(_timer, SIGNAL(timeout()), this, SLOT(my_timer_timeout()));
}

MyRoundWidget::~MyRoundWidget()
{
	delete _pixmap;
}

void MyRoundWidget::showRount(int x, int y, const QSize &size, QString msg)
{
	this->move(x, y);
	this->setFixedSize(size);

	_startTime = QTime::currentTime();
	_darwText = msg;

	_timer->start(20);
	this->show();
}

void MyRoundWidget::my_timer_timeout()
{
	_imageRotate += 10;
	if (_imageRotate >= 360)
		_imageRotate = 0;

	this->update();
	qApp->processEvents();
}

void MyRoundWidget::paintEvent(QPaintEvent *event)
{
	QPainter painter(this);
	painter.fillRect(this->rect(), QColor(98, 98, 98, 98));

	int pw = _radius;
	int ph = _radius;

	int cx = this->width() / 2;
	int cy = this->height() / 2;

	int sx = (this->width() - pw) / 2;
	int sy = (this->height() - ph) / 2;

	if (!_darwText.isEmpty())
	{
		QString msg = _darwText + QString("[%1s]").arg(_startTime.secsTo(QTime::currentTime()));
		QFontMetrics fm(font());
		int w = fm.width(msg);
		int h = fm.height();
		painter.drawText(QRectF(cx - w / 2.0, cy - h / 2.0 + ph / 2.0 + 20, w, h), msg);
	}

	painter.translate(cx, cy);
	painter.rotate(_imageRotate);
	painter.translate(-cx, -cy);

	painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
	painter.drawPixmap(sx, sy, pw, ph, *_pixmap);

	return QWidget::paintEvent(event);
}

二

头文件：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPixmap>
#include <QTimer>
#include <QTime>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
   // void showRount(int x, int y, const QSize &size, QString msg = QString());

protected:
   virtual void paintEvent(QPaintEvent *event) override;

protected slots:
    //void my_timer_timeout();

private:
    Ui::MainWindow *ui;
     QPixmap *_pixmap;
     QTimer *_timer;
  /*  QTime _startTime;

    QString _darwText;
    int _imageRotate;
    int _radius;*/
};

#endif // MAINWINDOW_H

源文件

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QApplication>
#include <QPainter>
#include <QPixmap>
#include <QTimer>
#include <QFontMetrics>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //ui->comboBox->setStyleSheet("QComboBox::drop-down { image:url(:/new/prefix1/xljt.png)}");
   _pixmap=new QPixmap(":/new/prefix1/jz.png");
   _timer=new QTimer(this);
   _timer->start(10);
   this->setWindowFlags(Qt::FramelessWindowHint |Qt::WindowStaysOnTopHint);
   this->setAttribute(Qt::WA_TranslucentBackground);//支持alpha通道！！！
   this->setAttribute(Qt::WA_NoSystemBackground);//不自动绘制背景
   connect(_timer,SIGNAL(timeout()),this,SLOT(update()));

}

MainWindow::~MainWindow()
{
    //delete _pixmap;
    delete ui;
}

void MainWindow::paintEvent(QPaintEvent *e)
{
static int i =0;//定义旋转度数
i++;

QPainter paint(this);
paint.translate(this->width()/2,this->height()/2);//设置原点为窗口中心
paint.rotate(i);//坐标旋转
paint.drawPixmap(-_pixmap->height()/2,-_pixmap->width()/2,*_pixmap);//经分析，应使图片中心，对应原点
if(i >= 360)
i = 0;//旋转度数检测
}