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/* This file is part of the KDE project
Copyright (C) 2006 Sven Langkamp <sven.langkamp@gmail.com>
Copyright (c) 2009 Cyrille Berger <cberger@cberger.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "KoColorSlider.h"
#include "KoColorSpace.h"
#include <KoColor.h>
#include <KoMixColorsOp.h>
#include <QPainter>
#include <QTimer>
#include <QStyleOption>
#include <QPointer>
#define ARROWSIZE 8
struct Q_DECL_HIDDEN KoColorSlider::Private
{
Private() : upToDate(false), displayRenderer(nullptr) {}
KoColor minColor;
KoColor maxColor;
QPixmap pixmap;
bool upToDate;
QPointer<KoColorDisplayRendererInterface> displayRenderer;
};
KoColorSlider::KoColorSlider(QWidget* parent, KoColorDisplayRendererInterface *displayRenderer)
: KSelector(parent)
, d(new Private)
{
setMaximum(255);
d->displayRenderer = displayRenderer;
connect(d->displayRenderer, SIGNAL(displayConfigurationChanged()), SLOT(update()));
}
KoColorSlider::KoColorSlider(Qt::Orientation o, QWidget *parent, KoColorDisplayRendererInterface *displayRenderer)
: KSelector(o, parent), d(new Private)
{
setMaximum(255);
d->displayRenderer = displayRenderer;
connect(d->displayRenderer, SIGNAL(displayConfigurationChanged()), SLOT(update()));
}
KoColorSlider::~KoColorSlider()
{
delete d;
}
void KoColorSlider::setColors(const KoColor& mincolor, const KoColor& maxcolor)
{
d->minColor = mincolor;
d->maxColor = maxcolor;
d->upToDate = false;
QTimer::singleShot(1, this, SLOT(update()));
}
void KoColorSlider::drawContents( QPainter *painter )
{
QPixmap checker(8, 8);
QPainter p(&checker);
p.fillRect(0, 0, 4, 4, Qt::lightGray);
p.fillRect(4, 0, 4, 4, Qt::darkGray);
p.fillRect(0, 4, 4, 4, Qt::darkGray);
p.fillRect(4, 4, 4, 4, Qt::lightGray);
p.end();
QRect contentsRect_(contentsRect());
painter->fillRect(contentsRect_, QBrush(checker));
if( !d->upToDate || d->pixmap.isNull() || d->pixmap.width() != contentsRect_.width()
|| d->pixmap.height() != contentsRect_.height() )
{
KoColor c = d->minColor; // smart way to fetch colorspace
QColor color;
const quint8 *colors[2];
colors[0] = d->minColor.data();
colors[1] = d->maxColor.data();
KoMixColorsOp * mixOp = c.colorSpace()->mixColorsOp();
QImage image(contentsRect_.width(), contentsRect_.height(), QImage::Format_ARGB32 );
if( orientation() == Qt::Horizontal ) {
for (int x = 0; x < contentsRect_.width(); x++) {
qreal t = static_cast<qreal>(x) / (contentsRect_.width() - 1);
qint16 colorWeights[2];
colorWeights[0] = static_cast<quint8>((1.0 - t) * 255 + 0.5);
colorWeights[1] = 255 - colorWeights[0];
mixOp->mixColors(colors, colorWeights, 2, c.data());
if (d->displayRenderer) {
color = d->displayRenderer->toQColor(c);
}
else {
color = c.toQColor();
}
for (int y = 0; y < contentsRect_.height(); y++)
image.setPixel(x, y, color.rgba());
}
}
else {
for (int y = 0; y < contentsRect_.height(); y++) {
qreal t = static_cast<qreal>(y) / (contentsRect_.height() - 1);
qint16 colorWeights[2];
colorWeights[0] = static_cast<quint8>((t) * 255 + 0.5);
colorWeights[1] = 255 - colorWeights[0];
mixOp->mixColors(colors, colorWeights, 2, c.data());
if (d->displayRenderer) {
color = d->displayRenderer->toQColor(c);
}
else {
color = c.toQColor();
}
for (int x = 0; x < contentsRect_.width(); x++)
image.setPixel(x, y, color.rgba());
}
}
d->pixmap = QPixmap::fromImage(image);
d->upToDate = true;
}
painter->drawPixmap( contentsRect_, d->pixmap, QRect( 0, 0, d->pixmap.width(), d->pixmap.height()) );
}
KoColor KoColorSlider::currentColor() const
{
const quint8 *colors[2];
colors[0] = d->minColor.data();
colors[1] = d->maxColor.data();
KoMixColorsOp * mixOp = d->minColor.colorSpace()->mixColorsOp();
KoColor c(d->minColor.colorSpace());
qint16 weights[2];
weights[1] = (value() - minimum()) / qreal(maximum() - minimum()) * 255;
weights[0] = 255 - weights[1];
mixOp->mixColors(colors, weights, 2, c.data());
return c;
}
void KoColorSlider::drawArrow(QPainter *painter, const QPoint &pos)
{
painter->setPen(QPen(palette().text().color(), 0));
painter->setBrush(palette().text());
QStyleOption o;
o.initFrom(this);
o.state &= ~QStyle::State_MouseOver;
if ( orientation() == Qt::Vertical ) {
o.rect = QRect( pos.x(), pos.y() - ARROWSIZE / 2,
ARROWSIZE, ARROWSIZE );
} else {
o.rect = QRect( pos.x() - ARROWSIZE / 2, pos.y(),
ARROWSIZE, ARROWSIZE );
}
QStyle::PrimitiveElement arrowPE;
switch (arrowDirection()) {
case Qt::UpArrow:
arrowPE = QStyle::PE_IndicatorArrowUp;
break;
case Qt::DownArrow:
arrowPE = QStyle::PE_IndicatorArrowDown;
break;
case Qt::RightArrow:
arrowPE = QStyle::PE_IndicatorArrowRight;
break;
case Qt::LeftArrow:
default:
arrowPE = QStyle::PE_IndicatorArrowLeft;
break;
}
style()->drawPrimitive(arrowPE, &o, painter, this);
}
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