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QAbstractItemView: make v-aligned items texts more user-friendly

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Commit 25133a1b77 fixed the item view text
layouting correctly in a technical way. For a vertically aligned text
which does not fit into the given rect it is not user-friendly to show
some parts of the text. It is better to display the start of it and show
an elide marker in the last visible line.

Fixes: QTBUG-73721
Change-Id: Ia7453133ea0a229b24196467168c8371585c4d8f
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
This commit is contained in:
Christian Ehrlicher 2019-02-17 21:02:11 +01:00
parent 3702622dde
commit 8b3463fdeb
1 changed files with 21 additions and 4 deletions
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25
src/widgets/styles/qcommonstyle.cpp
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@ -843,11 +843,14 @@ static void drawArrow(const QStyle *style, const QStyleOptionToolButton *toolbut
}
#endif // QT_CONFIG(toolbutton)
static QSizeF viewItemTextLayout(QTextLayout &textLayout, int lineWidth)
static QSizeF viewItemTextLayout(QTextLayout &textLayout, int lineWidth, int maxHeight = -1, int *lastVisibleLine = nullptr)
{
if (lastVisibleLine)
*lastVisibleLine = -1;
qreal height = 0;
qreal widthUsed = 0;
textLayout.beginLayout();
int i = 0;
while (true) {
QTextLine line = textLayout.createLine();
if (!line.isValid())
@ -856,6 +859,13 @@ static QSizeF viewItemTextLayout(QTextLayout &textLayout, int lineWidth)
line.setPosition(QPointF(0, height));
height += line.height();
widthUsed = qMax(widthUsed, line.naturalTextWidth());
// we assume that the height of the next line is the same as the current one
if (maxHeight > 0 && lastVisibleLine && height + line.height() > maxHeight) {
const QTextLine nextLine = textLayout.createLine();
*lastVisibleLine = nextLine.isValid() ? i : -1;
break;
}
++i;
}
textLayout.endLayout();
return QSizeF(widthUsed, height);
@ -869,7 +879,13 @@ QString QCommonStylePrivate::calculateElidedText(const QString &text, const QTex
QTextLayout textLayout(text, font);
textLayout.setTextOption(textOption);
viewItemTextLayout(textLayout, textRect.width());
// In AlignVCenter mode when more than one line is displayed and the height only allows
// some of the lines it makes no sense to display those. From a users perspective it makes
// more sense to see the start of the text instead something inbetween.
const bool vAlignmentOptimization = paintStartPosition && valign.testFlag(Qt::AlignVCenter);
int lastVisibleLine = -1;
viewItemTextLayout(textLayout, textRect.width(), vAlignmentOptimization ? textRect.height() : -1, &lastVisibleLine);
const QRectF boundingRect = textLayout.boundingRect();
// don't care about LTR/RTL here, only need the height
@ -896,7 +912,7 @@ QString QCommonStylePrivate::calculateElidedText(const QString &text, const QTex
const int start = line.textStart();
const int length = line.textLength();
const bool drawElided = line.naturalTextWidth() > textRect.width();
bool elideLastVisibleLine = false;
bool elideLastVisibleLine = lastVisibleLine == i;
if (!drawElided && i + 1 < lineCount && lastVisibleLineShouldBeElided) {
const QTextLine nextLine = textLayout.lineAt(i + 1);
const int nextHeight = height + nextLine.height() / 2;
@ -927,7 +943,8 @@ QString QCommonStylePrivate::calculateElidedText(const QString &text, const QTex
}
// below visible text, can stop
if (height + layoutRect.top() >= textRect.bottom())
if ((height + layoutRect.top() >= textRect.bottom()) ||
(lastVisibleLine >= 0 && lastVisibleLine == i))
break;
}
return ret;