thumbnailitem.cpp (40)

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#include "thumbnailitem.h"
#include "thumbnailscene.h"
#include <QWidget>
#include <QPainter>
#include <QApplication>
#include <QDrag>
#include <QMimeData>

ThumbnailItem::ThumbnailItem(const QPixmap& pm, int pageNum, QString lbl) :
    QGraphicsPixmapItem(pm),
//  selected(false),
    pageIdx(pageNum),
    label(lbl)
{
//  qDebug("ThumbnailItem(pixmap dims %d x %d, page %d: %s)",
//          pm.width(), pm.height(), pageNum, lbl.toAscii().constData());
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
}

void ThumbnailItem::paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget )
{
//  if (widget)
//      qDebug("paint into widget: %s", widget->metaObject()->className() );
    QGraphicsPixmapItem::paint(painter, option, widget);
//  if (selected)
//  {
//      painter->setPen(QPen(Qt::darkGreen, 3));
//      painter->drawRect(pixmap().rect().adjusted(-4, -4, 4, 4));
//  }
    QString pageStr = label;
    if (pageStr.isEmpty())
        pageStr = QString::number(pageIdx);
    QRect pageBounds = painter->boundingRect(0, 0, width(), height() - 1, Qt::AlignHCenter| Qt::AlignBottom, pageStr);
    QPainterPath pp;
    pp.moveTo(pageBounds.bottomRight());
    pp.arcTo(pageBounds.topRight().x(), pageBounds.topRight().y(), pageBounds.height() / 2, pageBounds.height() - 1, 270, 180);
//  pp.lineTo(pageBounds.topLeft());
    pp.arcTo(pageBounds.topLeft().x(), pageBounds.topLeft().y(), pageBounds.height() / -2, pageBounds.height() - 1, 90, -180);
    pp.lineTo(pageBounds.bottomRight());
    pp.closeSubpath();
    QColor pageLabelFill(Qt::lightGray);
    if (((ThumbnailScene*)scene())->currentPage() == pageIdx)
        pageLabelFill = Qt::red;
    pageLabelFill.setAlpha(220);
    painter->fillPath(pp, QBrush(pageLabelFill));
//  painter->drawPath(pp);
    painter->drawText(pageBounds, Qt::AlignCenter, pageStr);
}

void ThumbnailItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
        .length() < QApplication::startDragDistance())
        return;

    QDrag *drag = new QDrag(event->widget());
    QMimeData *mime = new QMimeData;
    drag->setMimeData(mime);
    drag->exec();
}

bool lessThan( const QGraphicsItem * s1 , const QGraphicsItem * s2 )
{
    return ((ThumbnailItem*)s1)->pageIdx < ((ThumbnailItem*)s2)->pageIdx;
}

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