Qt工作笔记-让界面飞一会（让界面旋转出来）

程序运行截图如下：

原理：在Widget上面套一个QGraphicsView，把Widget放入QGraphicsProxyWidget，然后对QGraphicsProxyWidget操作即可！

源码如下：

ddisplaydialog.h

#ifndef DISPLAYDIALOG_H
#define DISPLAYDIALOG_H

#include <QDialog>

QT_BEGIN_NAMESPACE
class QGraphicsScene;
QT_END_NAMESPACE

class SSignalWidget;
class MyCustomProxy;

namespace Ui {
class displayDialog;
}

class displayDialog : public QDialog
{
    Q_OBJECT

public:
    explicit displayDialog(QWidget *parent = 0);
    ~displayDialog();

protected:
    void initWidget();

protected slots:
    void closeGraphicsWindows();

private:
    Ui::displayDialog *ui;
    QGraphicsScene *m_scene;
    SSignalWidget *m_ssignalWidget;
    MyCustomProxy *m_myCustomProxy;
};

#endif // DISPLAYDIALOG_H

mycustomproxy.h

#ifndef MYCUSTOMPROXY_H
#define MYCUSTOMPROXY_H

#include <QGraphicsProxyWidget>

QT_BEGIN_NAMESPACE
class QTimeLine;
QT_END_NAMESPACE

class MyCustomProxy : public QGraphicsProxyWidget
{
    Q_OBJECT
public:
    MyCustomProxy(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
    ~MyCustomProxy();

protected slots:
    void updateStep(int step);

private:
    QTimeLine *m_timeLine;

};

#endif // MYCUSTOMPROXY_H

ssignalwidget.h

#ifndef SSIGNALWIDGET_H
#define SSIGNALWIDGET_H

#include <QWidget>

namespace Ui {
class SSignalWidget;
}

class SSignalWidget : public QWidget
{
    Q_OBJECT

public:
    explicit SSignalWidget(QWidget *parent = 0);
    ~SSignalWidget();

protected slots:
    void closeWindows();

signals:
    void allWindowsClose();

private:
    Ui::SSignalWidget *ui;
};

#endif // SSIGNALWIDGET_H

displaaydialog.cpp

#include "displaydialog.h"
#include "ui_displaydialog.h"

#include "mycustomproxy.h"
#include "ssignalwidget.h"

#include <QDebug>
#include <QTransform>
#include <QGraphicsScene>
#include <QEventLoop>
#include <QTimer>

displayDialog::displayDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::displayDialog)
{
    ui->setupUi(this);
    initWidget();
    showFullScreen();
}

displayDialog::~displayDialog()
{
    delete ui;
}

void displayDialog::initWidget()
{
    this->setWindowTitle("二次包含信号设置对话框");
    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;
    m_scene->setSceneRect(-500, -500, 500, 500);
    ui->graphicsView->setScene(m_scene);
    m_myCustomProxy = new MyCustomProxy;
    m_myCustomProxy->setWindowFlags(Qt::Window);
    //m_myCustomProxy->setFlags(QGraphicsItem::ItemIsSelectable | QGraphicsItem::ItemIsMovable);
    m_ssignalWidget = new SSignalWidget;
    m_scene->addItem(m_myCustomProxy);

    m_myCustomProxy->setWidget(m_ssignalWidget);
    m_myCustomProxy->setPos(-m_ssignalWidget->width(), -m_ssignalWidget->height());
    ui->graphicsView->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);


    connect(m_ssignalWidget, SIGNAL(allWindowsClose()), this, SLOT(closeGraphicsWindows()));
}

void displayDialog::closeGraphicsWindows()
{
    //延迟下，先让m_ssignalWidget关闭
    qDebug()<< "received closeSignal";
    QEventLoop loop;
    QTimer::singleShot(1000, &loop, SLOT(quit()));
    loop.exec();
    close();
}

main.cpp

#include "displaydialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    displayDialog w;
    w.show();

    return a.exec();
}

mycustomproxy.cpp

#include "mycustomproxy.h"
#include <QDebug>
#include <QTransform>
#include <QTimeLine>

MyCustomProxy::MyCustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags)
    : QGraphicsProxyWidget(parent, wFlags)
{

    QTransform transform;
    setTransform(transform.rotate(90, Qt::XAxis));

    m_timeLine = new QTimeLine;
    m_timeLine->setFrameRange(90, 0);
    m_timeLine->setDuration(1500);
    connect(m_timeLine, SIGNAL(frameChanged(int)),this,SLOT(updateStep(int)));
    m_timeLine->start();
}

MyCustomProxy::~MyCustomProxy()
{

}

void MyCustomProxy::updateStep(int step)
{
    QTransform transform;
    setTransform(transform.rotate(step, Qt::XAxis));
}

ssignalwidget.cpp

#include "ssignalwidget.h"
#include "ui_ssignalwidget.h"
#include <QEventLoop>
#include <QDebug>
#include <QTimer>

SSignalWidget::SSignalWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::SSignalWidget)
{
    ui->setupUi(this);
    connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(closeWindows()));
}

SSignalWidget::~SSignalWidget()
{
    delete ui;
}

void SSignalWidget::closeWindows()
{
    emit allWindowsClose();
    QEventLoop loop;
    QTimer::singleShot(0.5 * 1000, &loop, SLOT(quit()));
    this->close();
}

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