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TreeModel/Find: Save a few cycles when searching

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Calls parent() only ~two out of three times and remove some
function calls in the TreeModel::parent() implementation,
reducing the overall footprint of this bit from ~5 to ~1.5%
when searching something in the project tree (test case
was Creator-in-Creator, and searching for 'dddddddddd',
resulting in 8 complete scans of the tree.

Task-number: QTCREATORBUG-17956
Change-Id: I4e46ef0467dd2aea58a7c944e1a2ee5c01e6fbba
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
This commit is contained in:
hjk
2017-04-03 16:07:16 +02:00
parent 778d711393
commit 2a6237705c
3 changed files with 8 additions and 9 deletions
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8
src/libs/utils/treemodel.cpp
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@@ -919,11 +919,9 @@ QModelIndex BaseTreeModel::parent(const QModelIndex &idx) const
if (!grandparent)
return QModelIndex();
for (int i = 0, n = grandparent->childCount(); i < n; ++i)
if (grandparent->childAt(i) == parent)
return createIndex(i, 0, static_cast<void*>(parent));
return QModelIndex();
// This is on the performance-critical path for ItemViewFind.
const int i = grandparent->m_children.indexOf(parent);
return createIndex(i, 0, static_cast<void*>(parent));
}
int BaseTreeModel::rowCount(const QModelIndex &idx) const