程序運行截圖如下：

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關鍵點一：

->:這個箭頭表示左邊的類是放到右邊的類里面的

QWidget->QGraphicsProxyWidget

QGraphicsProxyWidget->QGraphicsScene

QGraphicsScene->QGraphicsView

本程序中在Ui中QGraphicsView是放入在QWIdget中的

關于QGraphicsProxyWidget的筆記請看：

https://blog.csdn.net/qq78442761/article/details/81507130

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關鍵點二：

QTimeLine是Qt的時間線函數，線有兩端，所以有2個方向，一般都使用QTimeLine實現這種生動的旋轉。

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源碼如下：

mycustomproxy.h

#ifndef MYCUSTOMPROXY_H #define MYCUSTOMPROXY_H#include <QGraphicsProxyWidget> #include <QTimeLine>QT_BEGIN_NAMESPACE class QGraphicsSceneHoverEvent; QT_END_NAMESPACEclass MyCustomProxy : public QGraphicsProxyWidget {Q_OBJECT public:explicit MyCustomProxy(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);~MyCustomProxy();protected:void hoverEnterEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) Q_DECL_OVERRIDE;protected slots:void updateStep(int step);void finished();private:QTimeLine *m_timeLine;qreal m_currAngle; };#endif // MYCUSTOMPROXY_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE class QGraphicsScene; QT_END_NAMESPACEnamespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;QGraphicsScene *m_scene; };#endif // WIDGET_H

widgetwindow.h

#ifndef WIDGETWINDOW_H #define WIDGETWINDOW_H#include <QWidget>namespace Ui { class WidgetWindow; }class WidgetWindow : public QWidget {Q_OBJECTpublic:explicit WidgetWindow(QWidget *parent = 0);~WidgetWindow();protected slots:void btnClicked();private:Ui::WidgetWindow *ui; };#endif // WIDGETWINDOW_H

main.cpp

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

mycustomproxy.cpp

#include "mycustomproxy.h" #include <QDebug> #include <QGraphicsScene> #include <QTransform>MyCustomProxy::MyCustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags): QGraphicsProxyWidget(parent,wFlags) {QTransform transform;setTransform(transform.rotate(-60,Qt::YAxis));m_currAngle=0;m_timeLine=new QTimeLine;m_timeLine->setFrameRange(-60,0);connect(m_timeLine,SIGNAL(frameChanged(int)),this,SLOT(updateStep(int)));connect(m_timeLine,SIGNAL(finished()),this,SLOT(finished())); }MyCustomProxy::~MyCustomProxy() {}void MyCustomProxy::hoverEnterEvent(QGraphicsSceneHoverEvent *event) {scene()->setActiveWindow(this);m_timeLine->setDirection(QTimeLine::Forward);if(m_timeLine->state()!=QTimeLine::Running)m_timeLine->start();QGraphicsProxyWidget::hoverEnterEvent(event); }void MyCustomProxy::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {m_timeLine->setDirection(QTimeLine::Backward);if(m_timeLine->state()!=QTimeLine::Running)m_timeLine->start();QGraphicsProxyWidget::hoverLeaveEvent(event); }void MyCustomProxy::updateStep(int step) {//qDebug()<<"step:"<<step;QTransform transform;setTransform(transform.rotate(step,Qt::YAxis)); }void MyCustomProxy::finished() {//qDebug()<<"finished!"; }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include "widgetwindow.h" #include "mycustomproxy.h" #include <QGraphicsScene> #include <QDebug> #include <QTransform>Widget::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);m_scene=new QGraphicsScene;ui->graphicsView->setScene(m_scene);MyCustomProxy *myCustomProxy_1=new MyCustomProxy;myCustomProxy_1->setWidget(new WidgetWindow);myCustomProxy_1->setWindowFlags(Qt::Desktop);myCustomProxy_1->setWindowTitle("QWidget demo 中文");myCustomProxy_1->setPos(-300,0);MyCustomProxy *myCustomProxy_2=new MyCustomProxy;myCustomProxy_2->setWidget(new WidgetWindow);myCustomProxy_2->setWindowFlags(Qt::Desktop);myCustomProxy_2->setWindowTitle("QWidget demo 中文");myCustomProxy_2->setPos(-150,0);MyCustomProxy *myCustomProxy_3=new MyCustomProxy;myCustomProxy_3->setWidget(new WidgetWindow);myCustomProxy_3->setWindowFlags(Qt::Desktop);myCustomProxy_3->setWindowTitle("QWidget demo 中文");myCustomProxy_3->setPos(0,0);MyCustomProxy *myCustomProxy_4=new MyCustomProxy;myCustomProxy_4->setWidget(new WidgetWindow);myCustomProxy_4->setWindowFlags(Qt::Desktop);myCustomProxy_4->setWindowTitle("QWidget demo 中文");myCustomProxy_4->setPos(150,0);MyCustomProxy *myCustomProxy_5=new MyCustomProxy;myCustomProxy_5->setWidget(new WidgetWindow);myCustomProxy_5->setWindowFlags(Qt::Desktop);myCustomProxy_5->setWindowTitle("QWidget demo 中文");myCustomProxy_5->setPos(300,0);m_scene->addItem(myCustomProxy_1);m_scene->addItem(myCustomProxy_2);m_scene->addItem(myCustomProxy_3);m_scene->addItem(myCustomProxy_4);m_scene->addItem(myCustomProxy_5);ui->graphicsView->setSceneRect(-404.027,-40.2044,939.058,402.725);ui->graphicsView->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate); }Widget::~Widget() {delete ui; }

widgetwindow.cpp

#include "widgetwindow.h" #include "ui_widgetwindow.h" #include <QMessageBox>WidgetWindow::WidgetWindow(QWidget *parent) :QWidget(parent),ui(new Ui::WidgetWindow) {ui->setupUi(this);connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked())); }WidgetWindow::~WidgetWindow() {delete ui; }void WidgetWindow::btnClicked() {QMessageBox::information(this,"提示","按鈕被按下了！"); }

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