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Use fuzzy text bounding rect computation to improve performance

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Do not use QGraphicsScene as it is not thread-safe
This commit is contained in:
Martin Tůma
2018-11-11 14:10:38 +01:00
parent 078fc93783
commit d6f6a0eb3d
9 changed files with 207 additions and 85 deletions
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39
src/textitem.cpp
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@ -1,39 +0,0 @@
#include <QPainter>
#include "textitem.h"
#define FLAGS (Qt::AlignCenter | Qt::TextWordWrap | Qt::TextDontClip)
TextItem::TextItem(const QString &text, const QPointF &pos, const QFont &font,
int maxTextWidth, QGraphicsItem *parent) : QGraphicsItem(parent), _text(text),
_font(font)
{
QFontMetrics fm(font);
int limit = font.pixelSize() * maxTextWidth;
// Italic fonts overflow the computed bounding rect, so reduce it
// a little bit.
if (font.italic())
limit -= font.pixelSize() / 2.0;
QRect br = fm.boundingRect(QRect(0, 0, limit, 0), FLAGS, text);
Q_ASSERT(br.isValid());
// Expand the bounding rect back to the real content size
if (font.italic())
br.adjust(-font.pixelSize() / 4.0, 0, font.pixelSize() / 4.0, 0);
setPos((pos - QPointF(br.width() / 2.0, br.height() / 2.0)).toPoint());
_boundingRect = QRectF(0, 0, br.width(), br.height());
}
void TextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
painter->setFont(_font);
painter->setPen(_pen);
painter->drawText(_boundingRect, FLAGS, _text);
//painter->setPen(Qt::red);
//painter->drawRect(_boundingRect);
}