/**
 * @file PaiTableItemDelegate.cpp
 * @date 2012-10-16
 */
#include <QPainter>
#include <QBrush>
#include <QLinearGradient>
#include <QApplication>

#include "PaiTableItemDelegate.h"

using namespace pai::gui;

PaiTableItemDelegate::PaiTableItemDelegate(QTableView *pTableView) :
    m_GridPen(QColor("#C9D5DC"), 0, pTableView->gridStyle()),
    m_HorizontalLine(true),
    m_VerticallLine(false)
{

}

void PaiTableItemDelegate::setShowGrid(bool horizontal, bool verticalLine)
{
    m_HorizontalLine = horizontal;
    m_VerticallLine = verticalLine;
}

void PaiTableItemDelegate::paint(QPainter *pPainter, const QStyleOptionViewItem & option, const QModelIndex & index) const
{
    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt, index);
    bool bSelected = opt.state & QStyle::State_Selected;

    QPointF startPoint(0, 0);
    QPointF finalPoint(0, opt.rect.height());
    QLinearGradient linearGrad(startPoint, finalPoint);

    if(bSelected)
    {
        opt.state = opt.state & ~QStyle::State_Selected;
        linearGrad.setColorAt(0, QColor("#F6FDFF"));
        linearGrad.setColorAt(1, QColor("#DAF3FD"));
        opt.backgroundBrush = QBrush(linearGrad);
    }
    else if(index.data(HOVERING_ROLE).toBool())
    {
        linearGrad.setColorAt(0, QColor("#F6FDFF"));
        linearGrad.setColorAt(1, QColor("#DAF3FD"));
        opt.backgroundBrush = QBrush(linearGrad);
    }
    else
    {
        opt.backgroundBrush = QBrush(Qt::white);
    }

    const QWidget *pWidget = opt.widget;
    if(pWidget == NULL)
    {
        return;
    }
    QStyle *pStyle = pWidget ? pWidget->style() : QApplication::style();

    pStyle->drawControl(QStyle::CE_ItemViewItem, &opt, pPainter, pWidget);

    QPen oldPen(pPainter->pen());
    pPainter->setPen(m_GridPen);

    if(m_VerticallLine) // paint vertical lines
    {
        pPainter->drawLine(option.rect.topRight(), option.rect.bottomRight());
    }

    if(m_HorizontalLine) // paint horizontal lines
    {
        pPainter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight());
    }

    pPainter->setPen(oldPen);
}