QComboBox的showPopup和hidePopup

今天碰到一个有意思的问题，在QComboBox弹出下拉的listView之后，你选中一个，上下拖动，然后你移出listview的控件范围，竟然不会hide，这样的话如果在item较小时，喜欢拖动的用户简直崩溃，所以我看了一下QComboBox的show和hide，最终重写了一下showPopup和hidePopup，触摸屏竟然识别不到QEvent::Leave事件，我退而求其次。为了能让弹出的listview自动消失，加了一个定时器判断

#ifndef DYECOMBOBOX_H
#define DYECOMBOBOX_H

#include 
#include 
#include 
#include 
#include 
#include 

class dyeComboBox : public QComboBox
{
    Q_OBJECT
public:
    explicit dyeComboBox(QWidget *p);
    ~dyeComboBox();
signals:
    void currentIndexChanged(int index);
protected:
    virtual void showPopup();
    virtual void hidePopup();
    virtual bool eventFilter(QObject * o, QEvent * e);
private slots:
    void slotUpdate();
private:
    QTimer *myTimer;
    int view_x_leftpos;
    int view_y_rightpos;
};

#endif // DYECOMBOBOX_H

#include "dyecombobox.h"


dyeComboBox::dyeComboBox(QWidget *p):QComboBox(p)
{
    /* 开启鼠标追踪 */
    setMouseTracking(true);
    myTimer = new QTimer(this);
    connect(myTimer,SIGNAL(timeout()),this,SLOT(slotUpdate()));
    view_x_leftpos = -1;
    view_y_rightpos = -1;
}

dyeComboBox::~dyeComboBox()
{

}
/* 下拉view的调用显示函数 */
void dyeComboBox::showPopup()
{
    /*1、默认弹出view，不改变  */
    QComboBox::showPopup();
    /*2、获取view的parent  */
    QWidget *popup = this->findChild();
    if(popup != NULL){
        view_x_leftpos = popup->x();
        view_y_rightpos = popup->x()+popup->width();
        /*3、设置QFrame的name，其实有没有没区别，为了严谨  */
        popup->setObjectName("popup");
        /*4、加入事件过滤  */
        popup->installEventFilter(this);
    }
}

/* 下拉view的调用隐藏函数 */
void dyeComboBox::hidePopup()
{
    /*1、清除之前的配置  */
    QWidget *popup = this->findChild();
    if(popup != NULL){
        popup->setObjectName("");
        popup->removeEventFilter(this);
        view_x_leftpos = -1;
        view_y_rightpos = -1;
    }
    /*2、隐藏  */
    QComboBox::hidePopup();

    emit currentIndexChanged(currentIndex());
}

bool dyeComboBox::eventFilter(QObject *o, QEvent *e)
{
    if(o->objectName() == "popup"){
        if(e->type() == QEvent::Leave){
            if(view() != NULL){
                /* 没有这一句会默认你显示前的index */
                int curIndex = view()->currentIndex().row();
                setCurrentIndex(curIndex);
            }
            hidePopup();
            return true;
        }else if(e->type() == QEvent::UpdateRequest){
            if(myTimer->isActive()){
                myTimer->start();
            }else{
                myTimer->start(100);
            }
            if(view() != NULL){
                int curIndex = view()->currentIndex().row();
                setCurrentIndex(curIndex);
            }
        }
    }
    return QComboBox::eventFilter(o,e);
}

void dyeComboBox::slotUpdate()
{
    myTimer->stop();
    if(QCursor::pos().x() < view_x_leftpos || QCursor::pos().x() > view_y_rightpos ){
//        qDebug() << "fouse out ";
        hidePopup();
    }else{
//        qDebug() << "fouse in ";
    }

}