Question

GraphicView（QGraphicsView的子类）我创建了视图和设置场景（QGraphicScene对象），并在drop事件触发时将对象（QDial，Linegraphseries，Qcustomplot）添加到场景中。我能够将对象添加到场景中我可以调整大小并移动对象但是 在调整大小时我将光标悬停在小部件上，向左，向上，向下。 但是光标没有改变......对于resize对象frameless.cpp使用...

Frameless.h

#include <QtGui/QMouseEvent>

class FrameLess : public QObject   
{   

    public:    
        enum Edge { None = 0x0, Left = 0x1,Top = 0x2, Right = 0x4,Bottom = 0x8,TopLeft = 0x10, TopRight = 0x20,BottomLeft = 0x40,BottomRight = 0x80};           
        Q_ENUM(Edge)  
        Q_DECLARE_FLAGS(Edges, Edge)  

        FrameLess(QWidget *parent);  
        void setBorderWidth(int);  
        int borderWidth() const;  
        QWidget *_parent = nullptr;  
        QRubberBand *_rubberband = nullptr;  
        bool _cursorchanged;   
        bool _leftButtonPressed;   
        Edges _mousePress = Edge::None;   
        Edges _mouseMove = Edge::None;  
        int _borderWidth;  

        QPoint _dragPos;  
        bool _dragStart = false;  

    protected:  
        bool eventFilter(QObject *o, QEvent *e) override;  
        void mouseHover(QHoverEvent*);  
        void mouseLeave(QEvent*);  
        void mousePress(QMouseEvent*);   
        void mouseRealese(QMouseEvent*);  
        void mouseMove(QMouseEvent*);  
        void updateCursorShape(const QPoint &);  
        void calculateCursorPosition(const QPoint &, const QRect &, Edges &);  

};

Frameless.cpp

#include "frameless.h"

FrameLess::FrameLess(QWidget *parent) :_parent(parent),_cursorchanged(false),_leftButtonPressed(false),
_borderWidth(5),_dragPos(QPoint())     
{     

     _parent->setMouseTracking(true);  
     _parent->setWindowFlags(Qt::FramelessWindowHint);  
     _parent->setAttribute(Qt::WA_PaintOnScreen);  
     _parent->setAttribute(Qt::WA_Hover);  
     _parent->installEventFilter(this);  
     _rubberband = new QRubberBand(QRubberBand::Rectangle);    

}    

void FrameLess::updateCursorShape(const QPoint &pos)   
{

    qDebug() << "UpdateCursor called";  
    if (_parent->isFullScreen() || _parent->isMaximized()) 
    {  

            if (_cursorchanged) 
            {  

                _parent->unsetCursor();  
                qDebug() << "UpdateCursor called cursor change return";

            }  
            return;  
    } 

    if (!_leftButtonPressed) 
    {
            calculateCursorPosition(pos, _parent->frameGeometry(), _mouseMove);  
            _cursorchanged = true;

            if (_mouseMove.testFlag(Edge::Top) || _mouseMove.testFlag(Edge::Bottom))   
            {
                qDebug() << "UpdateCursor called cursor change bottom or top";  
                _parent->setCursor(Qt::SizeVerCursor);  

            } 
        else if (_mouseMove.testFlag(Edge::Left)||_mouseMove.testFlag(Edge::Right))     
        {  

                qDebug() << "UpdateCursor called cursor change left or right";  
                _parent->setCursor(Qt::SizeHorCursor);

        }   
        else if(_mouseMove.testFlag(Edge::TopLeft)||_mouseMove.testFlag(Edge::BottomRight))   
        {  

         qDebug() << "UpdateCursor called cursor change TopLeft or BottomRight";  
                _parent->setCursor(Qt::SizeFDiagCursor);

        }  
        else if (_mouseMove.testFlag(Edge::TopRight)||_mouseMove.testFlag(Edge::BottomLeft))   
        {  

          qDebug() << "UpdateCursor called cursor change TopRight or BottomLeft";
                _parent->setCursor(Qt::SizeBDiagCursor); 

        }   
        else if (_cursorchanged)   
        { 

                _parent->unsetCursor();  
                _cursorchanged = false;  

        }    
    }     
}

Graphicsview.cpp

#include "frameless.h"

GraphicsView::GraphicsView(QWidget *parent)
    : QGraphicsView(parent)    
{

    scene = new GraphicScene();
    this->setScene(scene);
    this->setAcceptDrops(true);
    this->setFixedSize(1100,750);
    scene->setSceneRect(0,0,1100,750);
    this->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    this->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

}   

void GraphicsView::dropEvent(QDropEvent *event)   
{   

    if(event->mimeData()->text() == "Dial")     
    {      

       QDial *dial = new QDial(); **// creating object**   
       FrameLess *frame = new FrameLess(dial); // **frameless for resize**   
       QGraphicsProxyWidget *proxy = scene->addWidget(dial); 
       proxy->setPos(event->pos().x(), event->pos().y());   

    }     

}

M在cusor中获取所有调试消息改变功能。

我添加了最小的项目，你可以运行和检查。请仔细阅读此链接 Minimal Project with all related files

使用QGraphicsproxyWidget在QgraphicView上放置小部件上的鼠标光标没有改变？

0 个答案: