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Fix broken QPlainTextDocumentLayout after removing chars

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This fixes an issue where, if characters were removed from several
blocks in a single edit, the document layout would end up being
corrupted since the document layout manager wouldn't re-layout the
proper number of text blocks.

Task-number: QTBUG-30051
Change-Id: Idf3a6f567120e6a5dbebf1f65f685d374219328a
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
This commit is contained in:
Axel Rasmussen 2014-04-15 22:53:36 -06:00 committed by The Qt Project
parent ff31090d07
commit 2983cb9531
2 changed files with 48 additions and 2 deletions
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5
src/widgets/widgets/qplaintextedit.cpp
View File

@ -284,14 +284,15 @@ void QPlainTextDocumentLayoutPrivate::relayout()
/*! \reimp
*/
void QPlainTextDocumentLayout::documentChanged(int from, int /*charsRemoved*/, int charsAdded)
void QPlainTextDocumentLayout::documentChanged(int from, int charsRemoved, int charsAdded)
{
Q_D(QPlainTextDocumentLayout);
QTextDocument *doc = document();
int newBlockCount = doc->blockCount();
int charsChanged = qMax(charsRemoved, charsAdded);
QTextBlock changeStartBlock = doc->findBlock(from);
QTextBlock changeEndBlock = doc->findBlock(qMax(0, from + charsAdded - 1));
QTextBlock changeEndBlock = doc->findBlock(qMax(0, from + charsChanged - 1));
if (changeStartBlock == changeEndBlock && newBlockCount == d->blockCount) {
QTextBlock block = changeStartBlock;

45
tests/auto/widgets/widgets/qplaintextedit/tst_qplaintextedit.cpp
View File

@ -154,6 +154,7 @@ private slots:
void findBackwardWithRegExp();
void findWithRegExpReturnsFalseIfNoMoreResults();
#endif
void layoutAfterMultiLineRemove();
private:
void createSelection();
@ -1567,5 +1568,49 @@ void tst_QPlainTextEdit::findWithRegExpReturnsFalseIfNoMoreResults()
}
#endif
void tst_QPlainTextEdit::layoutAfterMultiLineRemove()
{
ed->setVisible(true); // The widget must be visible to reproduce this bug.
QString contents;
for (int i = 0; i < 5; ++i)
contents.append("\ttest\n");
ed->setPlainText(contents);
/*
* Remove the tab from the beginning of lines 2-4, in an edit block. The
* edit block is required for the bug to be reproduced.
*/
QTextCursor curs = ed->textCursor();
curs.movePosition(QTextCursor::Start);
curs.movePosition(QTextCursor::NextBlock);
curs.beginEditBlock();
for (int i = 0; i < 3; ++i) {
curs.deleteChar();
curs.movePosition(QTextCursor::NextBlock);
}
curs.endEditBlock();
/*
* Now, we're going to perform the following actions:
*
* - Move to the beginning of the document.
* - Move down three times - this should put us at the front of block 3.
* - Move to the end of the line.
*
* At this point, if the document layout is behaving correctly, we should
* still be positioned on block 3. Verify that this is the case.
*/
curs.movePosition(QTextCursor::Start);
curs.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor, 3);
curs.movePosition(QTextCursor::EndOfLine);
QCOMPARE(curs.blockNumber(), 3);
}
QTEST_MAIN(tst_QPlainTextEdit)
#include "tst_qplaintextedit.moc"