QGraphicsView旋转(横屏竖屏)

试图完成一个可横屏竖屏切换的界面，考虑到横屏以后文字也须要转过来，因此使用QGraphicsView将widget加入QGraphicsScene中，旋转QGraphicsView使整个界面旋转。
代码：
main.cpp

#include "Widget.h"
#include <QApplication>
#include <QGraphicsScene>
#include <QObject>
#include "MyGraphicsProxyWidget.h"
#include "Manager.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Manager m;
    return a.exec();
}

Manager.cpp 初始化QGraphicsView和QGraphicsScene，将Widget加入QGraphicsScene，并处理旋转后窗口大小的调整

#include "Manager.h"
#include <QDebug>
#include <QScrollBar>

Manager::Manager(QObject *parent) : QObject(parent)
{
    widget = new Widget;
    scene = new QGraphicsScene;
    scene->setSceneRect(widget->geometry());
    w = scene->addWidget(widget);
    myView = new MyGraphicsProxyWidget(w);
    //w->setRotation(180);
    view = new QGraphicsView(scene);
    view->setWindowFlags(Qt::FramelessWindowHint);//无边框
    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    //view->resize(1000,1000);
    //view->setTransformationAnchor(QGraphicsView::NoAnchor);
    QObject::connect(widget,SIGNAL(changeRotate(int)),this,SLOT(changeRotate(int)));
    QObject::connect(widget,SIGNAL(changeRotate(int)),myView,SLOT(changeRotate(int)));
    view->setFrameStyle(QFrame::NoFrame);//无Frame边框
    view->show();
}

void Manager::changeRotate(int)
{
    static int rotateCount = 1;
    if(rotateCount ==1 || rotateCount == 3){
        view->resize(400,300);
    }else{
        view->resize(300,400);
    }
    if(rotateCount == 4)
        rotateCount = 0;
    ++rotateCount;
}

MyGraphicsProxyWidget.cpp 处理旋转QGraphicsView，并移动view位置

#include "MyGraphicsProxyWidget.h"
#include <QDebug>

MyGraphicsProxyWidget::MyGraphicsProxyWidget(QGraphicsProxyWidget * view,QObject *parent)
    : QObject(parent)
{
    this->view = view;
}

void MyGraphicsProxyWidget::changeRotate(int rotate)
{
    qDebug()<<view->size()<<view->pos()<<view->mapToParent(0,0)<<view->mapToScene(0,0);
    view->setRotation(rotate);
    static int rotateCount = 1;
    if(rotateCount == 1){
        view->moveBy(350,0);
    }else if(rotateCount == 2){
        view->moveBy(-50,400);
    }else if(rotateCount == 3){
        view->moveBy(-350,-100);
    }else{
        view->moveBy(50,-300);
    }
    if(rotateCount == 4)
        rotateCount = 0;
    ++rotateCount;
}

Widget.cpp 触发旋转

#include "Widget.h"
#include "ui_Widget.h"
#include <QPainter>
#include <QTransform>
#include <QMessageBox>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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

void Widget::on_pushButton_clicked()
{
    static int rotate = 0;
    rotate += 90;
    if(rotate >= 360)
        rotate = 0;
    emit changeRotate(rotate);
}

void Widget::on_checkBox_clicked()
{
    QMessageBox::information(this,"ssssssssss","xccccccc");
}

效果：

简化一下，界面添加布局：

Manager.cpp 去掉changeRotate中窗口大小的调整

#include "Manager.h"
#include <QDebug>
#include <QScrollBar>

Manager::Manager(QObject *parent) : QObject(parent)
{
    widget = new Widget;
    scene = new QGraphicsScene;
    scene->setSceneRect(widget->geometry());
    w = scene->addWidget(widget);
    myView = new MyGraphicsProxyWidget(w);
    //w->setRotation(180);
    view = new QGraphicsView(scene);
    view->setWindowFlags(Qt::FramelessWindowHint);//无边框
    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    //view->resize(1000,1000);
    //view->setTransformationAnchor(QGraphicsView::NoAnchor);
    QObject::connect(widget,SIGNAL(changeRotate(int)),this,SLOT(changeRotate(int)));
    QObject::connect(widget,SIGNAL(changeRotate(int)),myView,SLOT(changeRotate(int)));
    view->setFrameStyle(QFrame::NoFrame);//无Frame边框
    view->show();
}

void Manager::changeRotate(int)
{
    //static int rotateCount = 1;
    //if(rotateCount ==1 || rotateCount == 3){
    // view->resize(400,300);
    //}else{
    // view->resize(300,400);
    //}
    //if(rotateCount == 4)
    // rotateCount = 0;
    //++rotateCount;
}

MyGraphicsProxyWidget.cpp changeRotate中加上view->resize，这样界面就能自适应屏幕：

#include "MyGraphicsProxyWidget.h"
#include <QDebug>

MyGraphicsProxyWidget::MyGraphicsProxyWidget(QGraphicsProxyWidget * view,QObject *parent)
    : QObject(parent)
{
    this->view = view;
}

void MyGraphicsProxyWidget::changeRotate(int rotate)
{
    qDebug()<<view->size()<<view->pos()<<view->mapToParent(0,0)<<view->mapToScene(0,0);
    view->setRotation(rotate);
    static int rotateCount = 1;
    if(rotateCount ==1 || rotateCount == 3){
        view->resize(400,300);
    }else{
        view->resize(300,400);
    }
    if(rotateCount == 1){
        view->moveBy(300,0);
    }else if(rotateCount == 2){
        view->moveBy(0,400);
    }else if(rotateCount == 3){
        view->moveBy(-300,0);
    }else{
        view->moveBy(0,-400);
    }
    if(rotateCount == 4)
        rotateCount = 0;
    ++rotateCount;
}

效果：就和手机横屏竖屏效果差很少了。。。代码是附件二

代码：https://github.com/yangyang0312/QtTestCode/tree/master/testViewRotate