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Use the sibling method to make iteration over a range potentially faster. 

The implementation of QAIM can implement an efficient version of sibling.

Task-number: QTBUG-17732
Change-Id: I474dbc11e52b3ccc42e2165bc9336882fab13d03
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
bb10
Stephen Kelly 2012-09-26 17:26:21 +02:00 committed by The Qt Project
parent a7b2c43dfb
commit 2d97c6a474
1 changed files with 7 additions and 4 deletions
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11
src/corelib/itemmodels/qitemselectionmodel.cpp
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@ -294,10 +294,13 @@ QItemSelectionRange QItemSelectionRange::intersected(const QItemSelectionRange &
static void indexesFromRange(const QItemSelectionRange &range, QModelIndexList &result)
{
if (range.isValid() && range.model()) {
const QModelIndex parent = range.parent();
for (int column = range.left(); column <= range.right(); ++column) {
for (int row = range.top(); row <= range.bottom(); ++row) {
QModelIndex index = range.model()->index(row, column, parent);
const QModelIndex topLeft = range.topLeft();
const int bottom = range.bottom();
const int right = range.right();
for (int row = topLeft.row(); row <= bottom; ++row) {
const QModelIndex columnLeader = topLeft.sibling(row, topLeft.column());
for (int column = topLeft.column(); column <= right; ++column) {
QModelIndex index = columnLeader.sibling(row, column);
Qt::ItemFlags flags = range.model()->flags(index);
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled))
result.append(index);