#include "qmytablewidget.h"
#include <QMouseEvent>
#include <QDebug>
#include <QApplication>
#include <QMimeData>
#include <QDrag>
#include <QWidget>

#include "CallManage.h"
#include "PropertyWidget.h"

//针对道
QMyTableWidget::QMyTableWidget(QWidget *parent) :
    QTableWidget(parent)
{
    //setSelectionBehavior(QAbstractItemView::SelectColumns);	//拖动列
    setAcceptDrops(true);

    connect(this, SIGNAL(sig_columnDragged(int, int)), this, SLOT(s_columnDragged(int, int)));

    connect(this, SIGNAL(itemSelectionChanged()), this, SLOT(ChangedItem()));
}


void QMyTableWidget::mousePressEvent(QMouseEvent *event)
{
    qDebug()<<"QMyTableWidget mousePressEvent";

    if(event->button() == Qt::LeftButton)
    {
        startPos = event->pos();
        //
        m_press = true;//鼠标按下的标志
//        m_draging = false;//鼠标左键释放的标志
//        m_selectRow = this->rowAt(event->y());//通过QtableWidget的row(at)记录按下的位置
        //m_selectCol = this->columnAt(event->x());//每一列都有一个逻辑值即logicIndex;这个逻辑值是不会变的
        m_selectCol = this->visualColumn(this->columnAt(event->x()));//格上面看见的列在第几列，那个值就是visualIndex
    }
    QTableWidget::mousePressEvent(event);
}

void QMyTableWidget::ChangedItem()
{
    qDebug()<<"QMyTableWidget itemSelectionChanged!";
}
void QMyTableWidget::mouseMoveEvent(QMouseEvent *event)
{    
    qDebug()<<"QMyTableWidget mouseMoveEvent";

    if (event->buttons() & Qt::LeftButton)
    {
        int distance = (event->pos() - startPos).manhattanLength();
        if (distance >= QApplication::startDragDistance())
        {
            performDrag();
        }
    }
    QTableWidget::mouseMoveEvent(event);
}

void QMyTableWidget::dragEnterEvent(QDragEnterEvent *event)
{
    qDebug()<<"QMyTableWidget dragEnterEvent";

    QMyTableWidget *source = qobject_cast<QMyTableWidget *>(event->source());
    if (source && source == this) {
        event->setDropAction(Qt::MoveAction);
        event->accept();
    }
}

void QMyTableWidget::dragMoveEvent(QDragMoveEvent *event)
{
    qDebug()<<"QMyTableWidget dragMoveEvent";

    QMyTableWidget *source = qobject_cast<QMyTableWidget *>(event->source());
    if (source && source == this) {
        event->setDropAction(Qt::MoveAction);
        event->accept();
    }
}

void QMyTableWidget::dropEvent(QDropEvent *event)
{
    qDebug()<<"QMyTableWidget dropEvent";

    QMyTableWidget *source = qobject_cast<QMyTableWidget *>(event->source());
    if (source && source == this) {
        QString strExtern = event->mimeData()->text();
        if(strExtern != "")
        {
            m_hoverCol = this->visualColumn(this->columnAt(event->pos().x()));//格上面看见的列在第几列，那个值就是visualIndex
            //
            if(m_selectCol != m_hoverCol && m_selectCol>=0 && m_hoverCol>=0)//判断两个位置是否相等
            {
                //emit sig_columnDragged(m_selectCol, m_hoverCol);
                s_columnDragged(m_selectCol, m_hoverCol);
            }

            // 接受拖拽事件
            event->setDropAction(Qt::MoveAction);
            event->accept();
        }
        else
        {
             // 如果井名不正确，不接受拖拽事件
             event->ignore();
        }
    }

}

void QMyTableWidget::s_columnDragged(int from, int to)
{
    qDebug()<<"QMyTableWidget s_columnDragged, from=" << QString::number(from) << ", to=" << QString::number(to);

    this->horizontalHeader()->moveSection(from, to); // 移动列的实际操作，注意这里的to是目标索引，不是偏移量，所以不需要加1。
}

void QMyTableWidget::mouseReleaseEvent(QMouseEvent *event)
{
    if(m_press)//如果鼠标左键被释放
    {
        qDebug()<<"QMyTableWidget mouseReleaseEvent";

        m_press = false;//按下标志置fasle，形成互斥

        int iCurrentRow = currentRow();
        qDebug()<<"QMyTableWidget mouseReleaseEvent, iCurrentRow=" << QString::number(iCurrentRow);

        if(iCurrentRow<0)
        {

            //未选中
            PropertyService()->initWidgetProperty();
        }
    }
}

//void QMyTableWidget::mouseReleaseEvent(QMouseEvent *event)
//{
//    qDebug()<<"QMyTableWidget mouseReleaseEvent";

//    if(m_press)//如果鼠标左键被释放
//    {
//        qDebug()<<"QMyTableWidget m_draging";

//        m_press = false;//按下标志置fasle，形成互斥
//        m_hoverRow = this->rowAt(event->y());//记录释放时，鼠标的位置
//        //m_hoverCol = this->columnAt(event->x());//每一列都有一个逻辑值即logicIndex;这个逻辑值是不会变的
//        m_hoverCol = this->visualColumn(this->columnAt(event->x()));//格上面看见的列在第几列，那个值就是visualIndex
//        //
//        if(m_selectCol != m_hoverCol && m_selectCol>=0 && m_hoverCol>=0)//判断两个位置是否相等
//        {
//            //emit sig_columnDragged(m_selectCol, m_hoverCol);
//            s_columnDragged(m_selectCol, m_hoverCol);
//        }
//    }
////   QTableWidget::mouseReleaseEvent(event);//增加这一行鼠标每次删除释放都会自动增加一行item
//}


//void itemSelectionChanged()
//{
//  if(m_selectRow != m_hover)//判断两个位置是否相等
//  {
//      QTableWidgetItem *olditem =takeItem(m_selectRow,0);//获取两个item的内容
//      QTableWidgetItem *currentItem=takeItem(m_hover,0);
//      setItem(m_selectRow,0,currentItem);//交换两个位置的内容
//      setItem(m_hover,0,olditem);
//  }
//}

void QMyTableWidget::performDrag()
{
    qDebug()<<"QMyTableWidget performDrag!";

    if(!currentItem())
    {
        return;
    }
    QString strExtern = currentItem()->text();

    QMimeData *mimeData = new QMimeData;
    mimeData->setText(strExtern);

    QDrag *drag = new QDrag(this);
    drag->setMimeData(mimeData);

    // 可以设置拖拽时的光标图标
    QRect itemRect = visualItemRect(currentItem()); // 获取项的矩形区域
    QPixmap itemPixmap = QWidget::grab(itemRect);//QPixmap::grabWidget(this, itemRect); // 获取项的屏幕截图
    // 调整拖拽光标的热点，使其位于截图的中心
    drag->setPixmap(itemPixmap);

    // 执行拖拽操作
    Qt::DropAction dropAction = drag->exec(Qt::MoveAction);
    if (dropAction == Qt::MoveAction) {
        //
    }
}