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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qtcolorbutton.h"
#include <QtWidgets/QColorDialog>
#include <QtGui/QPainter>
#include <QtCore/QMimeData>
#include <QtGui/QDragEnterEvent>
#include <QtGui/QDrag>
#include <QtWidgets/QApplication>
QT_BEGIN_NAMESPACE
class QtColorButtonPrivate : public QObject
{
Q_OBJECT
QtColorButton *q_ptr;
Q_DECLARE_PUBLIC(QtColorButton)
public:
QColor m_color;
#ifndef QT_NO_DRAGANDDROP
QColor m_dragColor;
QPoint m_dragStart;
bool m_dragging;
#endif
bool m_backgroundCheckered;
void slotEditColor();
QColor shownColor() const;
QPixmap generatePixmap() const;
};
void QtColorButtonPrivate::slotEditColor()
{
const QColor newColor = QColorDialog::getColor(m_color, q_ptr, QString(), QColorDialog::ShowAlphaChannel);
if (!newColor.isValid() || newColor == q_ptr->color())
return;
q_ptr->setColor(newColor);
emit q_ptr->colorChanged(m_color);
}
QColor QtColorButtonPrivate::shownColor() const
{
#ifndef QT_NO_DRAGANDDROP
if (m_dragging)
return m_dragColor;
#endif
return m_color;
}
QPixmap QtColorButtonPrivate::generatePixmap() const
{
QPixmap pix(24, 24);
int pixSize = 20;
QBrush br(shownColor());
QPixmap pm(2 * pixSize, 2 * pixSize);
QPainter pmp(&pm);
pmp.fillRect(0, 0, pixSize, pixSize, Qt::lightGray);
pmp.fillRect(pixSize, pixSize, pixSize, pixSize, Qt::lightGray);
pmp.fillRect(0, pixSize, pixSize, pixSize, Qt::darkGray);
pmp.fillRect(pixSize, 0, pixSize, pixSize, Qt::darkGray);
pmp.fillRect(0, 0, 2 * pixSize, 2 * pixSize, shownColor());
br = QBrush(pm);
QPainter p(&pix);
int corr = 1;
QRect r = pix.rect().adjusted(corr, corr, -corr, -corr);
p.setBrushOrigin((r.width() % pixSize + pixSize) / 2 + corr, (r.height() % pixSize + pixSize) / 2 + corr);
p.fillRect(r, br);
p.fillRect(r.width() / 4 + corr, r.height() / 4 + corr,
r.width() / 2, r.height() / 2,
QColor(shownColor().rgb()));
p.drawRect(pix.rect().adjusted(0, 0, -1, -1));
return pix;
}
///////////////
QtColorButton::QtColorButton(QWidget *parent)
: QToolButton(parent), d_ptr(new QtColorButtonPrivate)
{
d_ptr->q_ptr = this;
d_ptr->m_dragging = false;
d_ptr->m_backgroundCheckered = true;
setAcceptDrops(true);
connect(this, &QToolButton::clicked, d_ptr.data(), &QtColorButtonPrivate::slotEditColor);
setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
}
QtColorButton::~QtColorButton()
{
}
void QtColorButton::setColor(const QColor &color)
{
if (d_ptr->m_color == color)
return;
d_ptr->m_color = color;
update();
}
QColor QtColorButton::color() const
{
return d_ptr->m_color;
}
void QtColorButton::setBackgroundCheckered(bool checkered)
{
if (d_ptr->m_backgroundCheckered == checkered)
return;
d_ptr->m_backgroundCheckered = checkered;
update();
}
bool QtColorButton::isBackgroundCheckered() const
{
return d_ptr->m_backgroundCheckered;
}
void QtColorButton::paintEvent(QPaintEvent *event)
{
QToolButton::paintEvent(event);
if (!isEnabled())
return;
const int pixSize = 10;
QBrush br(d_ptr->shownColor());
if (d_ptr->m_backgroundCheckered) {
QPixmap pm(2 * pixSize, 2 * pixSize);
QPainter pmp(&pm);
pmp.fillRect(0, 0, pixSize, pixSize, Qt::white);
pmp.fillRect(pixSize, pixSize, pixSize, pixSize, Qt::white);
pmp.fillRect(0, pixSize, pixSize, pixSize, Qt::black);
pmp.fillRect(pixSize, 0, pixSize, pixSize, Qt::black);
pmp.fillRect(0, 0, 2 * pixSize, 2 * pixSize, d_ptr->shownColor());
br = QBrush(pm);
}
QPainter p(this);
const int corr = 4;
QRect r = rect().adjusted(corr, corr, -corr, -corr);
p.setBrushOrigin((r.width() % pixSize + pixSize) / 2 + corr, (r.height() % pixSize + pixSize) / 2 + corr);
p.fillRect(r, br);
//const int adjX = qRound(r.width() / 4.0);
//const int adjY = qRound(r.height() / 4.0);
//p.fillRect(r.adjusted(adjX, adjY, -adjX, -adjY),
// QColor(d_ptr->shownColor().rgb()));
/*
p.fillRect(r.adjusted(0, r.height() * 3 / 4, 0, 0),
QColor(d_ptr->shownColor().rgb()));
p.fillRect(r.adjusted(0, 0, 0, -r.height() * 3 / 4),
QColor(d_ptr->shownColor().rgb()));
*/
/*
const QColor frameColor0(0, 0, 0, qRound(0.2 * (0xFF - d_ptr->shownColor().alpha())));
p.setPen(frameColor0);
p.drawRect(r.adjusted(adjX, adjY, -adjX - 1, -adjY - 1));
*/
const QColor frameColor1(0, 0, 0, 26);
p.setPen(frameColor1);
p.drawRect(r.adjusted(1, 1, -2, -2));
const QColor frameColor2(0, 0, 0, 51);
p.setPen(frameColor2);
p.drawRect(r.adjusted(0, 0, -1, -1));
}
void QtColorButton::mousePressEvent(QMouseEvent *event)
{
#ifndef QT_NO_DRAGANDDROP
if (event->button() == Qt::LeftButton)
d_ptr->m_dragStart = event->pos();
#endif
QToolButton::mousePressEvent(event);
}
void QtColorButton::mouseMoveEvent(QMouseEvent *event)
{
#ifndef QT_NO_DRAGANDDROP
if (event->buttons() & Qt::LeftButton &&
(d_ptr->m_dragStart - event->pos()).manhattanLength() > QApplication::startDragDistance()) {
QMimeData *mime = new QMimeData;
mime->setColorData(color());
QDrag *drg = new QDrag(this);
drg->setMimeData(mime);
drg->setPixmap(d_ptr->generatePixmap());
setDown(false);
event->accept();
drg->exec(Qt::CopyAction);
return;
}
#endif
QToolButton::mouseMoveEvent(event);
}
#ifndef QT_NO_DRAGANDDROP
void QtColorButton::dragEnterEvent(QDragEnterEvent *event)
{
const QMimeData *mime = event->mimeData();
if (!mime->hasColor())
return;
event->accept();
d_ptr->m_dragColor = qvariant_cast<QColor>(mime->colorData());
d_ptr->m_dragging = true;
update();
}
void QtColorButton::dragLeaveEvent(QDragLeaveEvent *event)
{
event->accept();
d_ptr->m_dragging = false;
update();
}
void QtColorButton::dropEvent(QDropEvent *event)
{
event->accept();
d_ptr->m_dragging = false;
if (d_ptr->m_dragColor == color())
return;
setColor(d_ptr->m_dragColor);
emit colorChanged(color());
}
#endif
QT_END_NAMESPACE
#include "qtcolorbutton.moc"
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