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QLineEdit: account for the placeholderText when computing lineRect

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If in a QLineEdit the placeholderText uses e.g. Tibetan language, then the
height of font as reported by QFontMetrics might be less than the height
of the boundingRect calculated for the placeholderText. This can cause the
placeholderText to display incompletely.

Fix this by using QFontMetrics::boundingRect instead of QFontMetrics::height
when computing lineRect.

Fixes: QTBUG-95341
Pick-to: 5.15 6.1 6.2
Change-Id: I9eef35fd89c5c1d79f6dd703355634d6905ca967
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Zhang Hao 2021-07-23 15:39:57 +08:00 committed by Volker Hilsheimer
parent e4d62651c2
commit d267060189
1 changed files with 10 additions and 3 deletions
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13
src/widgets/widgets/qlineedit.cpp
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@ -1993,21 +1993,28 @@ void QLineEdit::paintEvent(QPaintEvent *)
p.setClipRect(r);
QFontMetrics fm = fontMetrics();
int fmHeight = 0;
if (d->shouldShowPlaceholderText())
fmHeight = fm.boundingRect(d->placeholderText).height();
else
fmHeight = fm.boundingRect(d->control->text() + d->control->preeditAreaText()).height();
fmHeight = qMax(fmHeight, fm.height());
Qt::Alignment va = QStyle::visualAlignment(d->control->layoutDirection(), QFlag(d->alignment));
switch (va & Qt::AlignVertical_Mask) {
case Qt::AlignBottom:
d->vscroll = r.y() + r.height() - fm.height() - QLineEditPrivate::verticalMargin;
d->vscroll = r.y() + r.height() - fmHeight - QLineEditPrivate::verticalMargin;
break;
case Qt::AlignTop:
d->vscroll = r.y() + QLineEditPrivate::verticalMargin;
break;
default:
//center
d->vscroll = r.y() + (r.height() - fm.height() + 1) / 2;
d->vscroll = r.y() + (r.height() - fmHeight + 1) / 2;
break;
}
QRect lineRect(r.x() + QLineEditPrivate::horizontalMargin, d->vscroll,
r.width() - 2 * QLineEditPrivate::horizontalMargin, fm.height());
r.width() - 2 * QLineEditPrivate::horizontalMargin, fmHeight);
if (d->shouldShowPlaceholderText()) {
if (!d->placeholderText.isEmpty()) {