kis_simplified_action_policy_strategy.cpp

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/*
 *  SPDX-FileCopyrightText: 2014 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kis_simplified_action_policy_strategy.h"
 
#include "KoPointerEvent.h"
#include <KoSnapGuide.h>
#include "kis_coordinates_converter.h"
 
 
struct KisSimplifiedActionPolicyStrategy::Private
{
    Private(const KisCoordinatesConverter *_converter, KoSnapGuide *_snapGuide)
        : converter(_converter),
          snapGuide(_snapGuide),
          sampleFromNodeModifierActive(false),
          changeSizeModifierActive(false),
          anySamplerModifierActive(false) {}
 
    const KisCoordinatesConverter *converter;
    KoSnapGuide *snapGuide;
 
    bool sampleFromNodeModifierActive;
    bool changeSizeModifierActive;
    bool anySamplerModifierActive;
    QPointF dragOffset;
    QPointF lastImagePos;
};
 
 
KisSimplifiedActionPolicyStrategy::KisSimplifiedActionPolicyStrategy(const KisCoordinatesConverter *_converter, KoSnapGuide *_snapGuide)
    : m_d(new Private(_converter, _snapGuide))
{
}
 
KisSimplifiedActionPolicyStrategy::~KisSimplifiedActionPolicyStrategy()
{
}
 
QPointF KisSimplifiedActionPolicyStrategy::handleSnapPoint(const QPointF &imagePos)
{
    return imagePos;
}
 
QPointF KisSimplifiedActionPolicyStrategy::snapDocPoint(const QPointF &point, Qt::KeyboardModifiers modifiers) const
{
    QPointF pos = point;
 
    if (m_d->snapGuide) {
        Qt::KeyboardModifiers modifiersForSnapping = modifiers;
 
        if (shiftModifierIsUsed()) {
            modifiersForSnapping.setFlag(Qt::ShiftModifier, false);
        }
 
        pos = m_d->snapGuide->snap(point, m_d->dragOffset, modifiersForSnapping);
    }
 
    return pos;
}
 
bool KisSimplifiedActionPolicyStrategy::beginPrimaryAction(KoPointerEvent *event)
{
    const QPointF rawImagePoint = m_d->converter->documentToImage(event->point);
    const QPointF snappedImagePoint = handleSnapPoint(rawImagePoint);
 
    if (m_d->snapGuide && rawImagePoint != snappedImagePoint) {
        QPointF imageOffset = snappedImagePoint - rawImagePoint;
        m_d->dragOffset = m_d->converter->imageToDocument(imageOffset);
    }
 
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
 
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    return beginPrimaryAction(imagePos);
}
 
void KisSimplifiedActionPolicyStrategy::continuePrimaryAction(KoPointerEvent *event)
{
    const bool shiftIsActive = event->modifiers() & Qt::ShiftModifier;
    const bool altIsActive = event->modifiers() & Qt::AltModifier;
 
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    return continuePrimaryAction(imagePos, shiftIsActive, altIsActive);
}
 
void KisSimplifiedActionPolicyStrategy::hoverActionCommon(KoPointerEvent *event)
{
    QPointF imagePos = m_d->converter->documentToImage(event->point);
    m_d->lastImagePos = imagePos;
 
    hoverActionCommon(imagePos);
}
 
bool KisSimplifiedActionPolicyStrategy::endPrimaryAction(KoPointerEvent *event)
{
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    return endPrimaryAction();
}
 
void KisSimplifiedActionPolicyStrategy::activatePrimaryAction()
{
    setTransformFunction(m_d->lastImagePos, m_d->anySamplerModifierActive && !m_d->sampleFromNodeModifierActive, m_d->changeSizeModifierActive, m_d->sampleFromNodeModifierActive);
}
 
void KisSimplifiedActionPolicyStrategy::activateAlternateAction(KisTool::AlternateAction action)
{
    if (action == KisTool::ChangeSize) {
        m_d->changeSizeModifierActive = true;
    } else if (action == KisTool::SampleFgNode || action == KisTool::SampleBgNode) {
        m_d->anySamplerModifierActive = true;
        m_d->sampleFromNodeModifierActive = true;
    } else if (action == KisTool::SampleFgImage || action == KisTool::SampleBgImage) {
        m_d->anySamplerModifierActive = true;
        m_d->sampleFromNodeModifierActive = false;
    }
 
    setTransformFunction(m_d->lastImagePos, m_d->anySamplerModifierActive && !m_d->sampleFromNodeModifierActive, m_d->changeSizeModifierActive, m_d->sampleFromNodeModifierActive);
}
 
void KisSimplifiedActionPolicyStrategy::deactivateAlternateAction(KisTool::AlternateAction action)
{
    if (action == KisTool::ChangeSize) {
        m_d->changeSizeModifierActive = false;
    } else if (action == KisTool::SampleFgNode || action == KisTool::SampleBgNode ||
               action == KisTool::SampleFgImage || action == KisTool::SampleBgImage) {
 
        m_d->anySamplerModifierActive = false;
        m_d->sampleFromNodeModifierActive = false;
    }
}
 
bool KisSimplifiedActionPolicyStrategy::beginAlternateAction(KoPointerEvent *event, KisTool::AlternateAction action)
{
    Q_UNUSED(action);
 
    if (!m_d->changeSizeModifierActive && !m_d->anySamplerModifierActive) return false;
 
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    return beginPrimaryAction(imagePos);
}
 
void KisSimplifiedActionPolicyStrategy::continueAlternateAction(KoPointerEvent *event, KisTool::AlternateAction action)
{
    Q_UNUSED(action);
 
    if (!m_d->changeSizeModifierActive && !m_d->anySamplerModifierActive) return;
    const bool altIsActive = event->modifiers() & Qt::AltModifier;
 
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    continuePrimaryAction(imagePos, m_d->changeSizeModifierActive, altIsActive);
}
 
bool KisSimplifiedActionPolicyStrategy::endAlternateAction(KoPointerEvent *event, KisTool::AlternateAction action)
{
    Q_UNUSED(action);
 
    if (!m_d->changeSizeModifierActive && !m_d->anySamplerModifierActive) return false;
 
    const QPointF pos = snapDocPoint(event->point, event->modifiers());
    QPointF imagePos = m_d->converter->documentToImage(pos);
    m_d->lastImagePos = imagePos;
 
    return endPrimaryAction();
}
 
bool KisSimplifiedActionPolicyStrategy::shiftModifierIsUsed() const
{
    return false;
}
 
void KisSimplifiedActionPolicyStrategy::hoverActionCommon(const QPointF &pt)
{
    setTransformFunction(pt, m_d->anySamplerModifierActive && !m_d->sampleFromNodeModifierActive, m_d->changeSizeModifierActive, m_d->sampleFromNodeModifierActive);
}