/**
* Converts a KItemSet to a QSet<int>.
*/
static QSet<int> KItemSet2QSet(const KItemSet& itemSet)
{
QSet<int> result;
for (int i : itemSet) {
result.insert(i);
}
// Check that the conversion was successful.
Q_ASSERT(itemSet.count() == result.count());
for (int i : itemSet) {
Q_ASSERT(result.contains(i));
}
foreach (int i, result) {
Q_ASSERT(itemSet.contains(i));
}
QPixmap KFileItemListView::createDragPixmap(const KItemSet& indexes) const
{
if (!model()) {
return QPixmap();
}
const int itemCount = indexes.count();
Q_ASSERT(itemCount > 0);
if (itemCount == 1) {
return KItemListView::createDragPixmap(indexes);
}
// If more than one item is dragged, align the items inside a
// rectangular grid. The maximum grid size is limited to 5 x 5 items.
int xCount;
int size;
if (itemCount > 16) {
xCount = 5;
size = KIconLoader::SizeSmall;
} else if (itemCount > 9) {
xCount = 4;
size = KIconLoader::SizeSmallMedium;
} else {
xCount = 3;
size = KIconLoader::SizeMedium;
}
if (itemCount < xCount) {
xCount = itemCount;
}
int yCount = itemCount / xCount;
if (itemCount % xCount != 0) {
++yCount;
}
if (yCount > xCount) {
yCount = xCount;
}
const qreal dpr = scene()->views()[0]->devicePixelRatio();
// Draw the selected items into the grid cells.
QPixmap dragPixmap(QSize(xCount * size + xCount, yCount * size + yCount) * dpr);
dragPixmap.setDevicePixelRatio(dpr);
dragPixmap.fill(Qt::transparent);
QPainter painter(&dragPixmap);
int x = 0;
int y = 0;
for (int index : indexes) {
QPixmap pixmap = model()->data(index).value("iconPixmap").value<QPixmap>();
if (pixmap.isNull()) {
QIcon icon = QIcon::fromTheme(model()->data(index).value("iconName").toString());
pixmap = icon.pixmap(size, size);
} else {
KPixmapModifier::scale(pixmap, QSize(size, size) * dpr);
}
painter.drawPixmap(x, y, pixmap);
x += size + 1;
if (x >= dragPixmap.width()) {
x = 0;
y += size + 1;
}
if (y >= dragPixmap.height()) {
break;
}
}
return dragPixmap;
}