MyTabBar.cpp

#include "MyTabBar.h"

#include <QApplication>
#include <QMouseEvent>
#include <QPainter>
#include <QDebug>

MyTabBar::MyTabBar(QWidget *parent)
    : QTabBar(parent)
{
    setAttribute(Qt::WA_StyledBackground);
    //tab页签可以拖拽交换位置
    setMovable(true);
    //tab页签显示关闭按钮
    setTabsClosable(true);
}

void MyTabBar::mousePressEvent(QMouseEvent *event)
{
    QTabBar::mousePressEvent(event);
    if(event->button()==Qt::LeftButton&&currentIndex()>=0)
    {
        //保存状态
        //pressPos=event->pos();
        theDragPress=true;
    }
}

void MyTabBar::mouseMoveEvent(QMouseEvent *event)
{
    QTabBar::mouseMoveEvent(event);

    //move的时候button为NoButton，但是button's里有
    if(theDragPress&&event->buttons())
    {
        //是否脱离了tabbar的范围
        if(!theDragOut&&!contentsRect().contains(event->pos())){
            theDragOut=true;
            emit beginDragOut(this->currentIndex());

            //QDrag.exec后就不会触发release了，自己手动触发
            //不过他好像还是在鼠标弹起之后才会进行动画，待解决
            QMouseEvent *e=new QMouseEvent(QEvent::MouseButtonRelease,
                                              this->mapFromGlobal(QCursor::pos()),
                                               Qt::LeftButton,
                                               Qt::LeftButton,
                                               Qt::NoModifier);
            //mouseReleaseEvent(event);
            QApplication::postEvent(this,e);
        }
    }
}

void MyTabBar::mouseReleaseEvent(QMouseEvent *event)
{
    QTabBar::mouseReleaseEvent(event);
    theDragPress=false;
    theDragOut=false;
}