QT自定义QGraphicsRectItem-白红宇

QT自定义QGraphicsRectItem

阅读量：511 次

发布时间：2019-03-07

本文共 1286 字，大约阅读时间需要 4 分钟。

PS：添加自定义类时需要继承QObject，来获得信号与槽功能。

//myrectitem.h#ifndef MYRECTITEM_H#define MYRECTITEM_H#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         //自定义QGraphicsRectItem，使其1.被单击时，状态栏显示标签名；2.右键显示删除菜单class MyRectItem : public QObject, public QGraphicsRectItem{ Q_OBJECTpublic: explicit MyRectItem(const QRectF & rect, QGraphicsItem *parent = nullptr);protected: void contextMenuEvent(QGraphicsSceneContextMenuEvent *event); void mousePressEvent(QGraphicsSceneMouseEvent *event);signals: void sendDelete(MyRectItem*); void show(MyRectItem*);public slots: void slotRemoveItem();};#endif // MYRECTITEM_H

//myrectitem.cpp#include "myrectitem.h"MyRectItem::MyRectItem(const QRectF & rect, QGraphicsItem *parent) : QGraphicsRectItem(rect, parent){   }void MyRectItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event){       QMenu menu;    QAction *removeAction = menu.addAction("删除");    connect(removeAction,SIGNAL(triggered()),this,SLOT(slotRemoveItem()));    menu.exec(event->screenPos());}void MyRectItem::slotRemoveItem(){       emit sendDelete(this);}void MyRectItem::mousePressEvent(QGraphicsSceneMouseEvent *event){       emit show(this);}

PS：父组件.cpp文件需要在创建MyRectItem时connect两个信号与槽，在删除时disconnect。

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