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Test for quadratic behaviour when rendering long line in QTextEdit 

QTextEdit showing long lines using lots of text format (for example
with a syntax highlighter) used to expose a quadratic behaviour which
make it impossible to edit files with long lines.

It was fiexed in the few previous commit

Task-number: QTBUG-8389
Change-Id: Ib7203497a7699a85ae1dfb70fe65d5fb36884b58
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
bb10
Olivier Goffart 2012-08-16 09:55:50 +02:00 committed by Qt by Nokia
parent b1e082ec9f
commit 4d5f3cf627
1 changed files with 36 additions and 0 deletions
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36
tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp
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@ -62,6 +62,7 @@
#include <qabstracttextdocumentlayout.h>
#include <qtextdocumentfragment.h>
#include <qsyntaxhighlighter.h>
#include "../../../shared/platforminputcontext.h"
#include <private/qinputmethod_p.h>
@ -212,6 +213,8 @@ private slots:
void inputMethodQueryImHints_data();
void inputMethodQueryImHints();
void highlightLongLine();
private:
void createSelection();
int blockCount() const;
@ -2483,5 +2486,38 @@ void tst_QTextEdit::inputMethodQueryImHints()
QCOMPARE(static_cast<Qt::InputMethodHints>(value.toInt()), hints);
}
void tst_QTextEdit::highlightLongLine()
{
QTextEdit edit;
edit.setAcceptRichText(false);
edit.setWordWrapMode(QTextOption::NoWrap);
QString singeLongLine;
for (int i = 0; i < 10000; ++i)
singeLongLine += "0123456789";
edit.setPlainText(singeLongLine);
class NumHighlighter : public QSyntaxHighlighter {
public:
explicit NumHighlighter(QTextDocument*doc) : QSyntaxHighlighter(doc) {};
virtual void highlightBlock(const QString& text) {
// odd number in bold
QTextCharFormat format;
format.setFontWeight(QFont::Bold);
for (int i = 0; i < text.size(); ++i) {
if (text.at(i).unicode() % 2)
setFormat(i, 1, format);
}
}
};
NumHighlighter nh(edit.document());
edit.show();
QTest::qWaitForWindowActive(edit.windowHandle());
QCoreApplication::processEvents();
//If there is a quadratic behaviour, this would take forever.
QVERIFY(true);
}
QTEST_MAIN(tst_QTextEdit)
#include "tst_qtextedit.moc"