46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
#include "Common.h"
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#include <QFontMetrics>
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// Origin: Qt
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// More specifically, this is a trimmed down version on the algorithm in:
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// https://code.woboq.org/qt5/qtbase/src/widgets/styles/qcommonstyle.cpp.html#846
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QStringList viewItemTextLayout(QTextLayout& textLayout, QSize bounds, qreal& height)
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{
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QStringList result;
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height = 0;
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QFontMetrics fontMetrics{ textLayout.font() };
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textLayout.beginLayout();
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QString str = textLayout.text();
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while (true) {
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QTextLine line = textLayout.createLine();
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if (!line.isValid())
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break;
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if (line.textLength() == 0)
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break;
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line.setLineWidth(bounds.width());
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height += line.height();
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// If the *next* line has enough space to be drawn, then we don't need to elide this line.
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if (height + fontMetrics.lineSpacing() < bounds.height()) {
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result.append(str.mid(line.textStart(), line.textLength()));
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} else {
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// Otherwise, if *this* line has enough space to be drawn, draw it elided.
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if (height < bounds.height()) {
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result.append(fontMetrics.elidedText(str.mid(line.textStart()), Qt::ElideRight, bounds.width()));
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}
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// And end it here, since we know there's not enough space to draw the next line.
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break;
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}
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}
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textLayout.endLayout();
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return result;
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}
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