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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.5.0 Beta1
Affects Version/s: 5.15.2, 6.2.4, 6.3.1
Component/s: GUI: Text handling
Labels:
None

Platform/s:

All
Commits:
013c346a8d (qt/qtbase/dev) 013c346a8d (qt/tqtc-qtbase/dev) 70e33a585c (qt/qtbase/6.4) 70e33a585c (qt/tqtc-qtbase/6.4) 07bde1cadf (qt/tqtc-qtbase/6.2) 991c056438 (qt/tqtc-qtbase/dev)

Found this while investigating ~~QTBUG-89557~~.

QTextLayout::maximumWidth() doesn't take into account line separator for multi-line text.
Reproduced on the current Dev as well.

Code sample:

#include <QGuiApplication>
#include <QTextLayout>

qreal layoutMaximumWidth(const QString &text)
{
    QTextLayout layout(text);
    layout.beginLayout();
    while (layout.createLine().isValid()) { }
    layout.endLayout();

    return layout.maximumWidth();
}

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qreal w1 = layoutMaximumWidth("test");
    qDebug() << "singleline maxwidth:" << w1;

    qreal w2 = layoutMaximumWidth("test\ntest");
    qDebug() << "multiline maxwidth:" << w2;

    Q_ASSERT(qFuzzyCompare(w1, w2));

    return 0;
}

Output:

singleline maxwidth: 19.4688
multiline maxwidth: 38.9375
ASSERT: "qFuzzyCompare(w1, w2)" in file ..\textLayout\main.cpp, line 24

For the test case above w1 should be equal to w2, and the ASSERT should not fire.
See full example textLayout.zip

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textLayout.zip
14 Jul '22 17:00
0.8 kB
Vladimir Belyavsky

relates to

QTBUG-95853 QTextLayout detecting new line in text

Reported

QTBUG-106909 QML Text's implicit size is not correct for an item with fixed size

Closed

QTBUG-89557 QML Text's implicitWidth is wrong when wrapMode is set for multiline text.

Closed

QTBUG-106947 QTextLayout::maximumWidth() doesn't handle spaces correctly

Closed

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For Gerrit Dashboard: QTBUG-104986
#	Subject	Branch	Project	Status	CR	V
433371,10	QTextLayout: fix maximumWidth() for a text containing line separator	dev	qt/qtbase	Status: MERGED	+2	0
433832,2	QTextLayout: fix maximumWidth() for a text containing line separator	6.4	qt/qtbase	Status: MERGED	+2	0
433835,2	QTextLayout: fix maximumWidth() for a text containing line separator	tqtc/lts-6.2	qt/tqtc-qtbase	Status: MERGED	+2	0
434531,2	Revert "QTextLayout: fix maximumWidth() for a text containing line separator"	dev	qt/qtbase	Status: MERGED	+2	0
434719,2	Revert "QTextLayout: fix maximumWidth() for a text containing line separator"	6.4	qt/qtbase	Status: MERGED	+2	0
434725,2	Revert "QTextLayout: fix maximumWidth() for a text containing line separator"	tqtc/lts-6.2	qt/tqtc-qtbase	Status: MERGED	+2	0
435080,6	QTextLayout: fix maximumWidth() for a text containing line separator	dev	qt/qtbase	Status: MERGED	+2	0