thumbnailscene.cpp (40)

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#include "thumbnailscene.h"
#include "common.h"

ThumbnailScene::ThumbnailScene() :
    cols(2), spacing(6), selectedIdx(-1), 
    defaultItemIcon(":/images/default-page.png"),
    insertionPoint(),
    maxWidth(0), maxHeight(0)
{
    qDebug("ThumbnailScene constructor");
    setBackgroundBrush(QBrush(Qt::darkGray));
    QPen thickRed(Qt::red);
    thickRed.setWidth(4);
    insertionPoint.setPen(thickRed);
}

void ThumbnailScene::resize(int numItems)
{
    foreach(ThumbnailItem* item, items)
        delete item;
    items.resize(numItems);
    col = 0;
    row = 0;
    maxWidth = 0;
    maxHeight = 0;
    selectedIdx = -1;
}

void ThumbnailScene::add(int idx, QImage pm, QString label)
{
    ThumbnailItem* item = NULL;
//  qDebug("for idx %d got thumb with dims %d x %d", idx, pm.width(), pm.height());
    if (pm.width() < 1)
    {
        item = new ThumbnailItem(defaultItemIcon, idx, label);
    }
    else
    {
        QPixmap pxm = QPixmap::fromImage(pm);
        item = new ThumbnailItem(pxm, idx, label);
    }
    addItem(item);
    if (item->width() > maxWidth)
        maxWidth = item->width();
    if (item->height() > maxHeight)
        maxHeight = item->height();
    items[idx] = item;
    item->setPos(col++ * maxWidth + spacing, row * maxHeight + spacing);
    if (col >= cols)
    {
        col = 0;
        ++row;
    }
    if (selectedIdx < 0)
        selectedIdx = idx;
//  layout.addItem(item, idx, 0, Qt::AlignHCenter);
}

void ThumbnailScene::layout(int width, int height)
{
    col = 0;
    row = 0;
    if (width > 0 && maxWidth > 0)
        cols = (width + spacing) / (maxWidth + spacing);
//qDebug("layout(%d), cols now %d, sceneRect %f x %f", width, cols, sceneRect().width(), sceneRect().height());
    int i = 0;
    foreach(ThumbnailItem* item, items)
    {
        if (col >= cols)
        {
            col = 0;
            ++row;
        }
        item->setPos(col++ * (maxWidth + spacing) + (maxWidth - item->width()) / 2,
                        row * (maxHeight + spacing) + (maxHeight - item->height()) / 2);
//      item->selected = (i == selectedIdx ? true : false);
        ++i;
    }
    QRectF sceneBounds = sceneRect();
    if (height > 0)
        sceneBounds.setHeight(MAX(height, (row + 1) * (maxHeight + spacing)));
    if (width > 0)
        sceneBounds.setWidth(width);
    setSceneRect(sceneBounds);
}

void ThumbnailScene::currentPage(int idx)
{
    selectedIdx = idx;
    update(sceneRect());
}

void ThumbnailScene::dragEnterEvent ( QGraphicsSceneDragDropEvent * ev )
{
    qDebug("dragEnterEvent at %f, %f", ev->scenePos().x(), ev->scenePos().y());
    ev->setAccepted(true);
    addItem(&insertionPoint);
}

void ThumbnailScene::dragMoveEvent ( QGraphicsSceneDragDropEvent * ev )
{
//  qDebug("dragMoveEvent to %f, %f", ev->scenePos().x(), ev->scenePos().y());
    QPoint insColRow = insertionIdx(ev->scenePos());
    int x = (insColRow.x() + 1) * (maxWidth + spacing);// + (spacing / 2);
    if (x == 0)
        x = insertionPoint.pen().width() / 2;
    else
        x -= insertionPoint.pen().width() / 2;
    int y = insColRow.y() * (maxHeight + spacing) + (spacing / 2);
//  qDebug("line top at %d, %d", x, y);
    insertionPoint.setLine(x, y, x, y + maxHeight);
    int insIdx = insColRow.y() * cols + insColRow.x();
    if (insIdx >= 0)
    {
        if (insIdx + 1 < items.size())
            emit statusMessage(QString("moving between %1 and %2").arg(items[insIdx]->pageIdx).arg(items[insIdx + 1]->pageIdx));
        else
            emit statusMessage(QString("moving to end"));
    }
    else
        emit statusMessage("moving to beginning");
}

void ThumbnailScene::dropEvent ( QGraphicsSceneDragDropEvent * ev )
{
    qDebug("dropEvent at %f, %f", ev->scenePos().x(), ev->scenePos().y());
    removeItem(&insertionPoint);
    emit statusClear();
    QPoint insColRow = insertionIdx(ev->scenePos());
    QList<QGraphicsItem *> sel = selectedItems();
    qSort(sel.begin(), sel.end(), lessThan);
    int insIdx = insColRow.y() * cols + insColRow.x() + 1;
    foreach (QGraphicsItem* item, sel)
    {
        int oldIdx = items.indexOf((ThumbnailItem*)item);
        if (oldIdx < 0)
            qWarning("item being dropped is not in the set of thumbnails!");
        else
            items.remove(oldIdx);
        if (oldIdx < insIdx)
            --insIdx;
    }
    foreach (QGraphicsItem* item, sel)
        items.insert(insIdx++, (ThumbnailItem*)item);
    layout();
}

QPoint ThumbnailScene::insertionIdx(QPointF pos)
{
    int row = (int)(pos.y() / (maxHeight + spacing));
    int xadj = (int)(pos.x() - ((maxWidth + spacing) / 2));
    int col = (xadj < 0 ? -1 : xadj / maxWidth);
    return QPoint(col, row);
}

QString ThumbnailScene::pdftkCatPageRanges()
{
    QString ret;
    int last = -1;
    int rangeStart = -1;
    foreach(ThumbnailItem* item, items)
    {
        if (last < 0)
            last = item->pageIdx;
        if (rangeStart < 0)
            rangeStart = last;
        if (item->pageIdx > 0 && item->pageIdx != last + 1)
        {
            if (rangeStart == last)
                ret += QString(" A%1").arg(rangeStart);
            else
                ret += QString(" A%1-%2").arg(rangeStart).arg(last);
            rangeStart = -1;
        }
        last = item->pageIdx;
    }
    if (!ret.isEmpty())
    {
        if (rangeStart == last || rangeStart < 0)
            ret += QString(" A%1").arg(last);
        else
            ret += QString(" A%1-%2").arg(rangeStart).arg(last);
    }
    return ret;
}

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