TextEditor: speed up searching in huge documents

Avoid creating QTextCursors for checking whether a search result is
inside the find scope. QTextCursor::setPosition seems to layout the
block the cursor is positioned at, which is not for free and not needed
to verify whether a search result is inside the find scope.

Change-Id: Ia1658fbbaa89a61f862e0b97eaa5b059972e2311
Reviewed-by: Christian Stenger <[email protected]>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/libs/utils/textutils.cpp b/src/libs/utils/textutils.cpp
index 252152415f8..f8ada6cca68 100644
--- a/src/libs/utils/textutils.cpp
+++ b/src/libs/utils/textutils.cpp
@@ -64,6 +64,16 @@ Position Position::fromCursor(const QTextCursor &c)
     return c.isNull() ? Position{} : Position{c.blockNumber() + 1, c.positionInBlock()};
 }
 
+int Position::toPositionInDocument(const QTextDocument *document) const
+{
+    QTC_ASSERT(document, return -1);
+    const QTextBlock block = document->findBlockByNumber(line - 1);
+    if (block.isValid())
+        return block.position() + qMin(column, block.length() - 1);
+
+    return -1;
+}
+
 int Range::length(const QString &text) const
 {
     if (end.line < begin.line)