subsurface/profile-widget/divetextitem.cpp

// SPDX-License-Identifier: GPL-2.0
#include "divetextitem.h"
#include "profilewidget2.h"
#include "core/color.h"
#include "core/errorhelper.h"

#include <QBrush>
#include <QDebug>
#include <QApplication>

DiveTextItem::DiveTextItem(double dpr, double scale, int alignFlags, QGraphicsItem *parent) : QGraphicsItemGroup(parent),
	internalAlignFlags(alignFlags),
	textBackgroundItem(new QGraphicsPathItem(this)),
	textItem(new QGraphicsPathItem(this)),
	dpr(dpr),
	scale(scale)
{
	setFlag(ItemIgnoresTransformations);
	textBackgroundItem->setBrush(QBrush(getColor(TEXT_BACKGROUND)));
	textBackgroundItem->setPen(Qt::NoPen);
	textItem->setPen(Qt::NoPen);
}

void DiveTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
	updateText();
	QGraphicsItemGroup::paint(painter, option, widget);
}

void DiveTextItem::set(const QString &t, const QBrush &b)
{
	textItem->setBrush(b);
	internalText = t;
	updateText();
}

const QString &DiveTextItem::text()
{
	return internalText;
}

QFont DiveTextItem::getFont(double dpr, double scale)
{
	QFont fnt(qApp->font());
	double size = fnt.pixelSize();
	if (size > 0) {
		// set in pixels - so the scale factor may not make a difference if it's too close to 1
		size *= scale * dpr;
		fnt.setPixelSize(lrint(size));
	} else {
		size = fnt.pointSizeF();
		size *= scale * dpr;
		fnt.setPointSizeF(size);
	}
	return fnt;
}

double DiveTextItem::fontHeight(double dpr, double scale)
{
	QFont fnt = getFont(dpr, scale);
	QFontMetrics fm(fnt);
	return (double)fm.height();
}

double DiveTextItem::height() const
{
	return fontHeight(dpr, scale);
}

void DiveTextItem::updateText()
{
	if (internalText.isEmpty())
		return;

	QFont fnt = getFont(dpr, scale);
	QFontMetrics fm(fnt);

	QPainterPath textPath;
	qreal xPos = 0, yPos = 0;

	QRectF rect = fm.boundingRect(internalText);
	yPos = (internalAlignFlags & Qt::AlignTop) ? 0 :
		(internalAlignFlags & Qt::AlignBottom) ? +rect.height() :
		/*(internalAlignFlags & Qt::AlignVCenter  ? */ +rect.height() / 4;

	xPos = (internalAlignFlags & Qt::AlignLeft) ? -rect.width() :
		(internalAlignFlags & Qt::AlignHCenter) ? -rect.width() / 2 :
		/* (internalAlignFlags & Qt::AlignRight) */ 0;

	textPath.addText(xPos, yPos, fnt, internalText);
	QPainterPathStroker stroker;
	stroker.setWidth(3);
	textBackgroundItem->setPath(stroker.createStroke(textPath));
	textItem->setPath(textPath);
}