cardsdelegate.cpp

程序代码使用说明： (1)所有源代码目录下都提供了Makefile（非Qt）

#include "CardsDelegate.h"
#include "CardsModel.h"
#include <QModelIndex>
#include <QPainter>

QSize CardsDelegate::cellSize(10,10);
QPolygon CardsDelegate::border;

void CardsDelegate::paint(QPainter *p, const QStyleOptionViewItem &o, const QModelIndex &i) const
{
    QVariant v = i.model()->data(i, Qt::BackgroundColorRole);
    QColor color = v.value<QColor>();
    QVariant font = i.model()->data(i, Qt::FontRole);
    if (!font.isNull())
        p->setFont(font.value<QFont>());

    p->setBrush(color);
    p->setPen(Qt::NoPen);

    int number = i.model()->data(i, Qt::DisplayRole).toInt();
    if (number == CardsModel::MAX_CARDS_NUM) 
    {
        p->drawRect(o.rect);
        return;
    }

    // get image from model
    // scale and draw the image
    v = i.model()->data(i, Qt::UserRole);
    QImage img = v.value<QImage>();        
    int w = o.rect.width();
    int h = o.rect.height();
    QImage img2=img.scaled(w, h);
    p->drawImage(o.rect, img2);

    // draw border
    QPolygon pol = border;
    pol.translate(o.rect.topLeft());
    p->setBrush(Qt::darkYellow);
    p->drawPolygon(pol);

    // if "show number", draw numbers
    v = i.model()->data(i, Qt::UserRole + 1);
    bool bShowNumber = v.toBool(); 
    if( bShowNumber ) 
    {
        int x2 = w - 1;
        int y2 = h - 1;
        
        p->setPen(Qt::red);
        p->drawText(o.rect.x(), o.rect.y(), x2, y2, Qt::AlignLeft | Qt::AlignTop, QString::number(number));
    }
            
}