qt-everywhere-src-5.15.1/qttools/src/shared/qtgradienteditor/qtgradientstopsmodel.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the tools applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 3 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
 ** packaging of this file. Please review the following information to
 ** ensure the GNU Lesser General Public License version 3 requirements
 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 2.0 or (at your option) the GNU General
 ** Public license version 3 or any later version approved by the KDE Free
 ** Qt Foundation. The licenses are as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
 ** included in the packaging of this file. Please review the following
 ** information to ensure the GNU General Public License requirements will
 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
 ** https://www.gnu.org/licenses/gpl-3.0.html.
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qtgradientstopsmodel.h"
 #include <QtGui/QColor>

 QT_BEGIN_NAMESPACE

 class QtGradientStopPrivate
 {
 public:
     qreal m_position;
     QColor m_color;
     QtGradientStopsModel *m_model;
 };

 qreal QtGradientStop::position() const
 {
     return d_ptr->m_position;
 }

 QColor QtGradientStop::color() const
 {
     return d_ptr->m_color;
 }

 QtGradientStopsModel *QtGradientStop::gradientModel() const
 {
     return d_ptr->m_model;
 }

 void QtGradientStop::setColor(const QColor &color)
 {
     d_ptr->m_color = color;
 }

 void QtGradientStop::setPosition(qreal position)
 {
     d_ptr->m_position = position;
 }

 QtGradientStop::QtGradientStop(QtGradientStopsModel *model)
     : d_ptr(new QtGradientStopPrivate())
 {
     d_ptr->m_position = 0;
     d_ptr->m_color = Qt::white;
     d_ptr->m_model = model;
 }

 QtGradientStop::~QtGradientStop()
 {
 }

 class QtGradientStopsModelPrivate
 {
     QtGradientStopsModel *q_ptr;
     Q_DECLARE_PUBLIC(QtGradientStopsModel)
 public:
     QMap<qreal, QtGradientStop *> m_posToStop;
     QMap<QtGradientStop *, qreal> m_stopToPos;
     QMap<QtGradientStop *, bool> m_selection;
     QtGradientStop *m_current;
 };


 QtGradientStopsModel::QtGradientStopsModel(QObject *parent)
     : QObject(parent), d_ptr(new QtGradientStopsModelPrivate)
 {
     d_ptr->q_ptr = this;
     d_ptr->m_current = 0;
 }

 QtGradientStopsModel::~QtGradientStopsModel()
 {
     clear();
 }

 QtGradientStopsModel::PositionStopMap QtGradientStopsModel::stops() const
 {
     return d_ptr->m_posToStop;
 }

 QtGradientStop *QtGradientStopsModel::at(qreal pos) const
 {
     if (d_ptr->m_posToStop.contains(pos))
         return d_ptr->m_posToStop[pos];
     return 0;
 }

 QColor QtGradientStopsModel::color(qreal pos) const
 {
     PositionStopMap gradStops = stops();
     if (gradStops.isEmpty())
         return QColor::fromRgbF(pos, pos, pos, 1.0);
     if (gradStops.contains(pos))
         return gradStops[pos]->color();

     gradStops[pos] = 0;
     PositionStopMap::ConstIterator itStop = gradStops.constFind(pos);
     if (itStop == gradStops.constBegin()) {
         ++itStop;
         return itStop.value()->color();
     }
     if (itStop == --gradStops.constEnd()) {
         --itStop;
         return itStop.value()->color();
     }
     PositionStopMap::ConstIterator itPrev = itStop;
     PositionStopMap::ConstIterator itNext = itStop;
     --itPrev;
     ++itNext;

     double prevX = itPrev.key();
     double nextX = itNext.key();

     double coefX = (pos - prevX) / (nextX - prevX);
     QColor prevCol = itPrev.value()->color();
     QColor nextCol = itNext.value()->color();

     QColor newColor;
     newColor.setRgbF((nextCol.redF()   - prevCol.redF()  ) * coefX + prevCol.redF(),
                      (nextCol.greenF() - prevCol.greenF()) * coefX + prevCol.greenF(),
                      (nextCol.blueF()  - prevCol.blueF() ) * coefX + prevCol.blueF(),
                      (nextCol.alphaF() - prevCol.alphaF()) * coefX + prevCol.alphaF());
     return newColor;
 }

 QList<QtGradientStop *> QtGradientStopsModel::selectedStops() const
 {
     return d_ptr->m_selection.keys();
 }

 QtGradientStop *QtGradientStopsModel::currentStop() const
 {
     return d_ptr->m_current;
 }

 bool QtGradientStopsModel::isSelected(QtGradientStop *stop) const
 {
     if (d_ptr->m_selection.contains(stop))
         return true;
     return false;
 }

 QtGradientStop *QtGradientStopsModel::addStop(qreal pos, const QColor &color)
 {
     qreal newPos = pos;
     if (pos < 0.0)
         newPos = 0.0;
     if (pos > 1.0)
         newPos = 1.0;
     if (d_ptr->m_posToStop.contains(newPos))
         return 0;
     QtGradientStop *stop = new QtGradientStop();
     stop->setPosition(newPos);
     stop->setColor(color);

     d_ptr->m_posToStop[newPos] = stop;
     d_ptr->m_stopToPos[stop] = newPos;

     emit stopAdded(stop);

     return stop;
 }

 void QtGradientStopsModel::removeStop(QtGradientStop *stop)
 {
     if (!d_ptr->m_stopToPos.contains(stop))
         return;
     if (currentStop() == stop)
         setCurrentStop(0);
     selectStop(stop, false);

     emit stopRemoved(stop);

     qreal pos = d_ptr->m_stopToPos[stop];
     d_ptr->m_stopToPos.remove(stop);
     d_ptr->m_posToStop.remove(pos);
     delete stop;
 }

 void QtGradientStopsModel::moveStop(QtGradientStop *stop, qreal newPos)
 {
     if (!d_ptr->m_stopToPos.contains(stop))
         return;
     if (d_ptr->m_posToStop.contains(newPos))
         return;

     if (newPos > 1.0)
         newPos = 1.0;
     else if (newPos < 0.0)
         newPos = 0.0;

     emit stopMoved(stop, newPos);

     const qreal oldPos = stop->position();
     stop->setPosition(newPos);
     d_ptr->m_stopToPos[stop] = newPos;
     d_ptr->m_posToStop.remove(oldPos);
     d_ptr->m_posToStop[newPos] = stop;
 }

 void QtGradientStopsModel::swapStops(QtGradientStop *stop1, QtGradientStop *stop2)
 {
     if (stop1 == stop2)
         return;
     if (!d_ptr->m_stopToPos.contains(stop1))
         return;
     if (!d_ptr->m_stopToPos.contains(stop2))
         return;

     emit stopsSwapped(stop1, stop2);

     const qreal pos1 = stop1->position();
     const qreal pos2 = stop2->position();
     stop1->setPosition(pos2);
     stop2->setPosition(pos1);
     d_ptr->m_stopToPos[stop1] = pos2;
     d_ptr->m_stopToPos[stop2] = pos1;
     d_ptr->m_posToStop[pos1] = stop2;
     d_ptr->m_posToStop[pos2] = stop1;
 }

 void QtGradientStopsModel::changeStop(QtGradientStop *stop, const QColor &newColor)
 {
     if (!d_ptr->m_stopToPos.contains(stop))
         return;
     if (stop->color() == newColor)
         return;

     emit stopChanged(stop, newColor);

     stop->setColor(newColor);
 }

 void QtGradientStopsModel::selectStop(QtGradientStop *stop, bool select)
 {
     if (!d_ptr->m_stopToPos.contains(stop))
         return;
     bool selected = d_ptr->m_selection.contains(stop);
     if (select == selected)
         return;

     emit stopSelected(stop, select);

     if (select)
         d_ptr->m_selection[stop] = true;
     else
         d_ptr->m_selection.remove(stop);
 }

 void QtGradientStopsModel::setCurrentStop(QtGradientStop *stop)
 {
     if (stop && !d_ptr->m_stopToPos.contains(stop))
         return;
     if (stop == currentStop())
         return;

     emit currentStopChanged(stop);

     d_ptr->m_current = stop;
 }

 QtGradientStop *QtGradientStopsModel::firstSelected() const
 {
     PositionStopMap stopList = stops();
     PositionStopMap::ConstIterator itStop = stopList.constBegin();
     while (itStop != stopList.constEnd()) {
         QtGradientStop *stop = itStop.value();
         if (isSelected(stop))
             return stop;
         ++itStop;
     };
     return 0;
 }

 QtGradientStop *QtGradientStopsModel::lastSelected() const
 {
     PositionStopMap stopList = stops();
     PositionStopMap::ConstIterator itStop = stopList.constEnd();
     while (itStop != stopList.constBegin()) {
         --itStop;

         QtGradientStop *stop = itStop.value();
         if (isSelected(stop))
             return stop;
     };
     return 0;
 }

 QtGradientStopsModel *QtGradientStopsModel::clone() const
 {
     QtGradientStopsModel *model = new QtGradientStopsModel();

     QMap<qreal, QtGradientStop *> stopsToClone = stops();
     for (auto it = stopsToClone.cbegin(), end = stopsToClone.cend(); it != end; ++it)
         model->addStop(it.key(), it.value()->color());
     // clone selection and current also
     return model;
 }

 void QtGradientStopsModel::moveStops(double newPosition)
 {
     QtGradientStop *current = currentStop();
     if (!current)
         return;

     double newPos = newPosition;

     if (newPos > 1)
         newPos = 1;
     else if (newPos < 0)
         newPos = 0;

     if (newPos == current->position())
         return;

     double offset = newPos - current->position();

     QtGradientStop *first = firstSelected();
     QtGradientStop *last = lastSelected();

     if (first && last) { // multiselection
         double maxOffset = 1.0 - last->position();
         double minOffset = -first->position();

         if (offset > maxOffset)
             offset = maxOffset;
         else if (offset < minOffset)
             offset = minOffset;

     }

     if (offset == 0)
         return;

     bool forward = (offset > 0) ? false : true;

     PositionStopMap stopList;

     const auto selected = selectedStops();
     for (QtGradientStop *stop : selected)
         stopList[stop->position()] = stop;
     stopList[current->position()] = current;

     PositionStopMap::ConstIterator itStop = forward ? stopList.constBegin() : stopList.constEnd();
     while (itStop != (forward ? stopList.constEnd() : stopList.constBegin())) {
         if (!forward)
             --itStop;
         QtGradientStop *stop = itStop.value();
             double pos = stop->position() + offset;
             if (pos > 1)
                 pos = 1;
             if (pos < 0)
                 pos = 0;

             if (current == stop)
                 pos = newPos;

             QtGradientStop *oldStop = at(pos);
             if (oldStop && !stopList.values().contains(oldStop))
                 removeStop(oldStop);
             moveStop(stop, pos);

         if (forward)
             ++itStop;
     }
 }

 void QtGradientStopsModel::clear()
 {
     const auto stopsList = stops().values();
     for (QtGradientStop *stop : stopsList)
         removeStop(stop);
 }

 void QtGradientStopsModel::clearSelection()
 {
     const auto stopsList = selectedStops();
     for (QtGradientStop *stop : stopsList)
         selectStop(stop, false);
 }

 namespace {
     template <typename BidirectionalIterator>
     std::reverse_iterator<BidirectionalIterator> rev(BidirectionalIterator it)
     { return std::reverse_iterator<BidirectionalIterator>(it); }
 }

 void QtGradientStopsModel::flipAll()
 {
     QMap<qreal, QtGradientStop *> stopsMap = stops();
     QMap<QtGradientStop *, bool> swappedList;
     for (auto itStop = rev(stopsMap.keyValueEnd()), end = rev(stopsMap.keyValueBegin()); itStop != end; ++itStop) {
         QtGradientStop *stop = (*itStop).second;
         if (swappedList.contains(stop))
             continue;
         const double newPos = 1.0 - (*itStop).first;
         if (stopsMap.contains(newPos)) {
             QtGradientStop *swapped = stopsMap.value(newPos);
             swappedList[swapped] = true;
             swapStops(stop, swapped);
         } else {
             moveStop(stop, newPos);
         }
     }
 }

 void QtGradientStopsModel::selectAll()
 {
     const auto stopsMap = stops();
     for (auto it = stopsMap.cbegin(), end = stopsMap.cend(); it != end; ++it)
         selectStop(it.value(), true);
 }

 void QtGradientStopsModel::deleteStops()
 {
     const auto selected = selectedStops();
     for (QtGradientStop *stop : selected)
         removeStop(stop);
     QtGradientStop *current = currentStop();
     if (current)
         removeStop(current);
 }

 QT_END_NAMESPACE
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the tools applications of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** GNU Lesser General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU Lesser
	** General Public License version 3 as published by the Free Software
	** Foundation and appearing in the file LICENSE.LGPL3 included in the
	** packaging of this file. Please review the following information to
	** ensure the GNU Lesser General Public License version 3 requirements
	** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU
	** General Public License version 2.0 or (at your option) the GNU General
	** Public license version 3 or any later version approved by the KDE Free
	** Qt Foundation. The licenses are as published by the Free Software
	** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
	** included in the packaging of this file. Please review the following
	** information to ensure the GNU General Public License requirements will
	** be met: https://www.gnu.org/licenses/gpl-2.0.html and
	** https://www.gnu.org/licenses/gpl-3.0.html.
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qtgradientstopsmodel.h"
	#include <QtGui/QColor>

	QT_BEGIN_NAMESPACE

	class QtGradientStopPrivate
	{
	public:
	qreal m_position;
	QColor m_color;
	QtGradientStopsModel *m_model;
	};

	qreal QtGradientStop::position() const
	{
	return d_ptr->m_position;
	}

	QColor QtGradientStop::color() const
	{
	return d_ptr->m_color;
	}

	QtGradientStopsModel *QtGradientStop::gradientModel() const
	{
	return d_ptr->m_model;
	}

	void QtGradientStop::setColor(const QColor &color)
	{
	d_ptr->m_color = color;
	}

	void QtGradientStop::setPosition(qreal position)
	{
	d_ptr->m_position = position;
	}

	QtGradientStop::QtGradientStop(QtGradientStopsModel *model)
	: d_ptr(new QtGradientStopPrivate())
	{
	d_ptr->m_position = 0;
	d_ptr->m_color = Qt::white;
	d_ptr->m_model = model;
	}

	QtGradientStop::~QtGradientStop()
	{
	}

	class QtGradientStopsModelPrivate
	{
	QtGradientStopsModel *q_ptr;
	Q_DECLARE_PUBLIC(QtGradientStopsModel)
	public:
	QMap<qreal, QtGradientStop *> m_posToStop;
	QMap<QtGradientStop *, qreal> m_stopToPos;
	QMap<QtGradientStop *, bool> m_selection;
	QtGradientStop *m_current;
	};



	QtGradientStopsModel::QtGradientStopsModel(QObject *parent)
	: QObject(parent), d_ptr(new QtGradientStopsModelPrivate)
	{
	d_ptr->q_ptr = this;
	d_ptr->m_current = 0;
	}

	QtGradientStopsModel::~QtGradientStopsModel()
	{
	clear();
	}

	QtGradientStopsModel::PositionStopMap QtGradientStopsModel::stops() const
	{
	return d_ptr->m_posToStop;
	}

	QtGradientStop *QtGradientStopsModel::at(qreal pos) const
	{
	if (d_ptr->m_posToStop.contains(pos))
	return d_ptr->m_posToStop[pos];
	return 0;
	}

	QColor QtGradientStopsModel::color(qreal pos) const
	{
	PositionStopMap gradStops = stops();
	if (gradStops.isEmpty())
	return QColor::fromRgbF(pos, pos, pos, 1.0);
	if (gradStops.contains(pos))
	return gradStops[pos]->color();

	gradStops[pos] = 0;
	PositionStopMap::ConstIterator itStop = gradStops.constFind(pos);
	if (itStop == gradStops.constBegin()) {
	++itStop;
	return itStop.value()->color();
	}
	if (itStop == --gradStops.constEnd()) {
	--itStop;
	return itStop.value()->color();
	}
	PositionStopMap::ConstIterator itPrev = itStop;
	PositionStopMap::ConstIterator itNext = itStop;
	--itPrev;
	++itNext;

	double prevX = itPrev.key();
	double nextX = itNext.key();

	double coefX = (pos - prevX) / (nextX - prevX);
	QColor prevCol = itPrev.value()->color();
	QColor nextCol = itNext.value()->color();

	QColor newColor;
	newColor.setRgbF((nextCol.redF() - prevCol.redF() ) * coefX + prevCol.redF(),
	(nextCol.greenF() - prevCol.greenF()) * coefX + prevCol.greenF(),
	(nextCol.blueF() - prevCol.blueF() ) * coefX + prevCol.blueF(),
	(nextCol.alphaF() - prevCol.alphaF()) * coefX + prevCol.alphaF());
	return newColor;
	}

	QList<QtGradientStop *> QtGradientStopsModel::selectedStops() const
	{
	return d_ptr->m_selection.keys();
	}

	QtGradientStop *QtGradientStopsModel::currentStop() const
	{
	return d_ptr->m_current;
	}

	bool QtGradientStopsModel::isSelected(QtGradientStop *stop) const
	{
	if (d_ptr->m_selection.contains(stop))
	return true;
	return false;
	}

	QtGradientStop *QtGradientStopsModel::addStop(qreal pos, const QColor &color)
	{
	qreal newPos = pos;
	if (pos < 0.0)
	newPos = 0.0;
	if (pos > 1.0)
	newPos = 1.0;
	if (d_ptr->m_posToStop.contains(newPos))
	return 0;
	QtGradientStop *stop = new QtGradientStop();
	stop->setPosition(newPos);
	stop->setColor(color);

	d_ptr->m_posToStop[newPos] = stop;
	d_ptr->m_stopToPos[stop] = newPos;

	emit stopAdded(stop);

	return stop;
	}

	void QtGradientStopsModel::removeStop(QtGradientStop *stop)
	{
	if (!d_ptr->m_stopToPos.contains(stop))
	return;
	if (currentStop() == stop)
	setCurrentStop(0);
	selectStop(stop, false);

	emit stopRemoved(stop);

	qreal pos = d_ptr->m_stopToPos[stop];
	d_ptr->m_stopToPos.remove(stop);
	d_ptr->m_posToStop.remove(pos);
	delete stop;
	}

	void QtGradientStopsModel::moveStop(QtGradientStop *stop, qreal newPos)
	{
	if (!d_ptr->m_stopToPos.contains(stop))
	return;
	if (d_ptr->m_posToStop.contains(newPos))
	return;

	if (newPos > 1.0)
	newPos = 1.0;
	else if (newPos < 0.0)
	newPos = 0.0;

	emit stopMoved(stop, newPos);

	const qreal oldPos = stop->position();
	stop->setPosition(newPos);
	d_ptr->m_stopToPos[stop] = newPos;
	d_ptr->m_posToStop.remove(oldPos);
	d_ptr->m_posToStop[newPos] = stop;
	}

	void QtGradientStopsModel::swapStops(QtGradientStop stop1, QtGradientStop stop2)
	{
	if (stop1 == stop2)
	return;
	if (!d_ptr->m_stopToPos.contains(stop1))
	return;
	if (!d_ptr->m_stopToPos.contains(stop2))
	return;

	emit stopsSwapped(stop1, stop2);

	const qreal pos1 = stop1->position();
	const qreal pos2 = stop2->position();
	stop1->setPosition(pos2);
	stop2->setPosition(pos1);
	d_ptr->m_stopToPos[stop1] = pos2;
	d_ptr->m_stopToPos[stop2] = pos1;
	d_ptr->m_posToStop[pos1] = stop2;
	d_ptr->m_posToStop[pos2] = stop1;
	}

	void QtGradientStopsModel::changeStop(QtGradientStop *stop, const QColor &newColor)
	{
	if (!d_ptr->m_stopToPos.contains(stop))
	return;
	if (stop->color() == newColor)
	return;

	emit stopChanged(stop, newColor);

	stop->setColor(newColor);
	}

	void QtGradientStopsModel::selectStop(QtGradientStop *stop, bool select)
	{
	if (!d_ptr->m_stopToPos.contains(stop))
	return;
	bool selected = d_ptr->m_selection.contains(stop);
	if (select == selected)
	return;

	emit stopSelected(stop, select);

	if (select)
	d_ptr->m_selection[stop] = true;
	else
	d_ptr->m_selection.remove(stop);
	}

	void QtGradientStopsModel::setCurrentStop(QtGradientStop *stop)
	{
	if (stop && !d_ptr->m_stopToPos.contains(stop))
	return;
	if (stop == currentStop())
	return;

	emit currentStopChanged(stop);

	d_ptr->m_current = stop;
	}

	QtGradientStop *QtGradientStopsModel::firstSelected() const
	{
	PositionStopMap stopList = stops();
	PositionStopMap::ConstIterator itStop = stopList.constBegin();
	while (itStop != stopList.constEnd()) {
	QtGradientStop *stop = itStop.value();
	if (isSelected(stop))
	return stop;
	++itStop;
	};
	return 0;
	}

	QtGradientStop *QtGradientStopsModel::lastSelected() const
	{
	PositionStopMap stopList = stops();
	PositionStopMap::ConstIterator itStop = stopList.constEnd();
	while (itStop != stopList.constBegin()) {
	--itStop;

	QtGradientStop *stop = itStop.value();
	if (isSelected(stop))
	return stop;
	};
	return 0;
	}

	QtGradientStopsModel *QtGradientStopsModel::clone() const
	{
	QtGradientStopsModel *model = new QtGradientStopsModel();

	QMap<qreal, QtGradientStop *> stopsToClone = stops();
	for (auto it = stopsToClone.cbegin(), end = stopsToClone.cend(); it != end; ++it)
	model->addStop(it.key(), it.value()->color());
	// clone selection and current also
	return model;
	}

	void QtGradientStopsModel::moveStops(double newPosition)
	{
	QtGradientStop *current = currentStop();
	if (!current)
	return;

	double newPos = newPosition;

	if (newPos > 1)
	newPos = 1;
	else if (newPos < 0)
	newPos = 0;

	if (newPos == current->position())
	return;

	double offset = newPos - current->position();

	QtGradientStop *first = firstSelected();
	QtGradientStop *last = lastSelected();

	if (first && last) { // multiselection
	double maxOffset = 1.0 - last->position();
	double minOffset = -first->position();

	if (offset > maxOffset)
	offset = maxOffset;
	else if (offset < minOffset)
	offset = minOffset;

	}

	if (offset == 0)
	return;

	bool forward = (offset > 0) ? false : true;

	PositionStopMap stopList;

	const auto selected = selectedStops();
	for (QtGradientStop *stop : selected)
	stopList[stop->position()] = stop;
	stopList[current->position()] = current;

	PositionStopMap::ConstIterator itStop = forward ? stopList.constBegin() : stopList.constEnd();
	while (itStop != (forward ? stopList.constEnd() : stopList.constBegin())) {
	if (!forward)
	--itStop;
	QtGradientStop *stop = itStop.value();
	double pos = stop->position() + offset;
	if (pos > 1)
	pos = 1;
	if (pos < 0)
	pos = 0;

	if (current == stop)
	pos = newPos;

	QtGradientStop *oldStop = at(pos);
	if (oldStop && !stopList.values().contains(oldStop))
	removeStop(oldStop);
	moveStop(stop, pos);

	if (forward)
	++itStop;
	}
	}

	void QtGradientStopsModel::clear()
	{
	const auto stopsList = stops().values();
	for (QtGradientStop *stop : stopsList)
	removeStop(stop);
	}

	void QtGradientStopsModel::clearSelection()
	{
	const auto stopsList = selectedStops();
	for (QtGradientStop *stop : stopsList)
	selectStop(stop, false);
	}

	namespace {
	template <typename BidirectionalIterator>
	std::reverse_iterator<BidirectionalIterator> rev(BidirectionalIterator it)
	{ return std::reverse_iterator<BidirectionalIterator>(it); }
	}

	void QtGradientStopsModel::flipAll()
	{
	QMap<qreal, QtGradientStop *> stopsMap = stops();
	QMap<QtGradientStop *, bool> swappedList;
	for (auto itStop = rev(stopsMap.keyValueEnd()), end = rev(stopsMap.keyValueBegin()); itStop != end; ++itStop) {
	QtGradientStop stop = (itStop).second;
	if (swappedList.contains(stop))
	continue;
	const double newPos = 1.0 - (*itStop).first;
	if (stopsMap.contains(newPos)) {
	QtGradientStop *swapped = stopsMap.value(newPos);
	swappedList[swapped] = true;
	swapStops(stop, swapped);
	} else {
	moveStop(stop, newPos);
	}
	}
	}

	void QtGradientStopsModel::selectAll()
	{
	const auto stopsMap = stops();
	for (auto it = stopsMap.cbegin(), end = stopsMap.cend(); it != end; ++it)
	selectStop(it.value(), true);
	}

	void QtGradientStopsModel::deleteStops()
	{
	const auto selected = selectedStops();
	for (QtGradientStop *stop : selected)
	removeStop(stop);
	QtGradientStop *current = currentStop();
	if (current)
	removeStop(current);
	}

	QT_END_NAMESPACE