File indexing completed on 2024-04-14 03:53:28

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2007 Fredrik Höglund <fredrik@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "delegateanimationhandler_p.h"
 
 #include <QAbstractItemView>
 #include <QDebug>
 #include <QPersistentModelIndex>
 #include <QTime>
 
 #include "kdirmodel.h"
 #include <QAbstractProxyModel>
 #include <cmath>
 
 #include "moc_delegateanimationhandler_p.cpp"
 
 namespace KIO
 {
 // Needed because state() is a protected method
 class ProtectedAccessor : public QAbstractItemView
 {
     Q_OBJECT
 public:
     bool draggingState() const
     {
         return state() == DraggingState;
     }
 };
 
 // Debug output is disabled by default, use kdebugdialog to enable it
 // static int animationDebugArea() { static int s_area = KDebug::registerArea("kio (delegateanimationhandler)", false);
 //                                  return s_area; }
 
 // ---------------------------------------------------------------------------
 
 CachedRendering::CachedRendering(QStyle::State state, const QSize &size, const QModelIndex &index, qreal devicePixelRatio)
     : state(state)
     , regular(QPixmap(size * devicePixelRatio))
     , hover(QPixmap(size * devicePixelRatio))
     , valid(true)
     , validityIndex(index)
 {
     regular.setDevicePixelRatio(devicePixelRatio);
     hover.setDevicePixelRatio(devicePixelRatio);
     regular.fill(Qt::transparent);
     hover.fill(Qt::transparent);
 
     if (index.model()) {
         connect(index.model(), &QAbstractItemModel::dataChanged, this, &CachedRendering::dataChanged);
         connect(index.model(), &QAbstractItemModel::modelReset, this, &CachedRendering::modelReset);
     }
 }
 
 void CachedRendering::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
 {
     if (validityIndex.row() >= topLeft.row() && validityIndex.column() >= topLeft.column() && validityIndex.row() <= bottomRight.row()
         && validityIndex.column() <= bottomRight.column()) {
         valid = false;
     }
 }
 
 void CachedRendering::modelReset()
 {
     valid = false;
 }
 
 // ---------------------------------------------------------------------------
 
 AnimationState::AnimationState(const QModelIndex &index)
     : index(index)
     , direction(QTimeLine::Forward)
     , animating(false)
     , jobAnimation(false)
     , progress(0.0)
     , m_fadeProgress(1.0)
     , m_jobAnimationAngle(0.0)
     , renderCache(nullptr)
     , fadeFromRenderCache(nullptr)
 {
     creationTime.start();
 }
 
 AnimationState::~AnimationState()
 {
     delete renderCache;
     delete fadeFromRenderCache;
 }
 
 bool AnimationState::update()
 {
     const qreal runtime = (direction == QTimeLine::Forward ? 150 : 250); // milliseconds
     const qreal increment = 1000. / runtime / 1000.;
     const qreal delta = increment * time.restart();
 
     if (direction == QTimeLine::Forward) {
         progress = qMin(qreal(1.0), progress + delta);
         animating = (progress < 1.0);
     } else {
         progress = qMax(qreal(0.0), progress - delta);
         animating = (progress > 0.0);
     }
 
     if (fadeFromRenderCache) {
         // Icon fading goes always forwards
         m_fadeProgress = qMin(qreal(1.0), m_fadeProgress + delta);
         animating |= (m_fadeProgress < 1.0);
         if (m_fadeProgress == 1) {
             setCachedRenderingFadeFrom(nullptr);
         }
     }
 
     if (jobAnimation) {
         m_jobAnimationAngle += 1.0;
         if (m_jobAnimationAngle == 360) {
             m_jobAnimationAngle = 0;
         }
 
         if (index.model()->data(index, KDirModel::HasJobRole).toBool()) {
             animating = true;
             // there is a job here still...
             return false;
         } else {
             animating = false;
             // there's no job here anymore, return true so we stop painting this.
             return true;
         }
     } else {
         return !animating;
     }
 }
 
 static constexpr double s_mPI2 = 1.57079632679489661923;
 
 qreal AnimationState::hoverProgress() const
 {
     return qRound(255.0 * std::sin(progress * s_mPI2)) / 255.0;
 }
 
 qreal AnimationState::fadeProgress() const
 {
     return qRound(255.0 * std::sin(m_fadeProgress * s_mPI2)) / 255.0;
 }
 
 qreal AnimationState::jobAnimationAngle() const
 {
     return m_jobAnimationAngle;
 }
 
 bool AnimationState::hasJobAnimation() const
 {
     return jobAnimation;
 }
 
 void AnimationState::setJobAnimation(bool value)
 {
     jobAnimation = value;
 }
 
 // ---------------------------------------------------------------------------
 
 static const int switchIconInterval = 1000; ///@todo Eventually configurable interval?
 
 DelegateAnimationHandler::DelegateAnimationHandler(QObject *parent)
     : QObject(parent)
 {
     iconSequenceTimer.setSingleShot(true);
     iconSequenceTimer.setInterval(switchIconInterval);
     connect(&iconSequenceTimer, &QTimer::timeout, this, &DelegateAnimationHandler::sequenceTimerTimeout);
     ;
 }
 
 DelegateAnimationHandler::~DelegateAnimationHandler()
 {
     timer.stop();
 
     QMapIterator<const QAbstractItemView *, AnimationList *> i(animationLists);
     while (i.hasNext()) {
         i.next();
         qDeleteAll(*i.value());
         delete i.value();
     }
     animationLists.clear();
 }
 
 void DelegateAnimationHandler::sequenceTimerTimeout()
 {
     QAbstractItemModel *model = const_cast<QAbstractItemModel *>(sequenceModelIndex.model());
     QAbstractProxyModel *proxy = qobject_cast<QAbstractProxyModel *>(model);
     QModelIndex index = sequenceModelIndex;
 
     if (proxy) {
         index = proxy->mapToSource(index);
         model = proxy->sourceModel();
     }
 
     KDirModel *dirModel = dynamic_cast<KDirModel *>(model);
     if (dirModel) {
         // qDebug() << "requesting" << currentSequenceIndex;
         dirModel->requestSequenceIcon(index, currentSequenceIndex);
         iconSequenceTimer.start(); // Some upper-bound interval is needed, in case items are not generated
     }
 }
 
 void DelegateAnimationHandler::gotNewIcon(const QModelIndex &index)
 {
     Q_UNUSED(index);
 
     // qDebug() << currentSequenceIndex;
     if (sequenceModelIndex.isValid() && currentSequenceIndex) {
         iconSequenceTimer.start();
     }
     //   if(index ==sequenceModelIndex) //Leads to problems
     ++currentSequenceIndex;
 }
 
 void DelegateAnimationHandler::setSequenceIndex(int sequenceIndex)
 {
     // qDebug() << sequenceIndex;
 
     if (sequenceIndex > 0) {
         currentSequenceIndex = sequenceIndex;
         iconSequenceTimer.start();
     } else {
         currentSequenceIndex = 0;
         sequenceTimerTimeout(); // Set the icon back to the standard one
         currentSequenceIndex = 0; // currentSequenceIndex was incremented, set it back to 0
         iconSequenceTimer.stop();
     }
 }
 
 void DelegateAnimationHandler::eventuallyStartIteration(const QModelIndex &index)
 {
     //      if (KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects) {
     /// Think about it.
 
     if (sequenceModelIndex.isValid()) {
         setSequenceIndex(0); // Stop old iteration, and reset the icon for the old iteration
     }
 
     // Start sequence iteration
     sequenceModelIndex = index;
     setSequenceIndex(1);
     //      }
 }
 
 AnimationState *DelegateAnimationHandler::animationState(const QStyleOption &option, const QModelIndex &index, const QAbstractItemView *view)
 {
     // We can't do animations reliably when an item is being dragged, since that
     // item will be drawn in two locations at the same time and hovered in one and
     // not the other. We can't tell them apart because they both have the same index.
     if (!view || static_cast<const ProtectedAccessor *>(view)->draggingState()) {
         return nullptr;
     }
 
     AnimationState *state = findAnimationState(view, index);
     bool hover = option.state & QStyle::State_MouseOver;
 
     // If the cursor has entered an item
     if (!state && hover) {
         state = new AnimationState(index);
         addAnimationState(state, view);
 
         if (!fadeInAddTime.isValid() || (fadeInAddTime.isValid() && fadeInAddTime.elapsed() > 300)) {
             startAnimation(state);
         } else {
             state->animating = false;
             state->progress = 1.0;
             state->direction = QTimeLine::Forward;
         }
 
         fadeInAddTime.restart();
 
         eventuallyStartIteration(index);
     } else if (state) {
         // If the cursor has exited an item
         if (!hover && (!state->animating || state->direction == QTimeLine::Forward)) {
             state->direction = QTimeLine::Backward;
 
             if (state->creationTime.elapsed() < 200) {
                 state->progress = 0.0;
             }
 
             startAnimation(state);
 
             // Stop sequence iteration
             if (index == sequenceModelIndex) {
                 setSequenceIndex(0);
                 sequenceModelIndex = QPersistentModelIndex();
             }
         } else if (hover && state->direction == QTimeLine::Backward) {
             // This is needed to handle the case where an item is dragged within
             // the view, and dropped in a different location. State_MouseOver will
             // initially not be set causing a "hover out" animation to start.
             // This reverses the direction as soon as we see the bit being set.
             state->direction = QTimeLine::Forward;
 
             if (!state->animating) {
                 startAnimation(state);
             }
 
             eventuallyStartIteration(index);
         }
     } else if (!state && index.model()->data(index, KDirModel::HasJobRole).toBool()) {
         state = new AnimationState(index);
         addAnimationState(state, view);
         startAnimation(state);
         state->setJobAnimation(true);
     }
 
     return state;
 }
 
 AnimationState *DelegateAnimationHandler::findAnimationState(const QAbstractItemView *view, const QModelIndex &index) const
 {
     // Try to find a list of animation states for the view
     const AnimationList *list = animationLists.value(view);
 
     if (list) {
         auto it = std::find_if(list->cbegin(), list->cend(), [&index](AnimationState *state) {
             return state->index == index;
         });
         if (it != list->cend()) {
             return *it;
         }
     }
 
     return nullptr;
 }
 
 void DelegateAnimationHandler::addAnimationState(AnimationState *state, const QAbstractItemView *view)
 {
     AnimationList *list = animationLists.value(view);
 
     // If this is the first time we've seen this view
     if (!list) {
         connect(view, &QObject::destroyed, this, &DelegateAnimationHandler::viewDeleted);
 
         list = new AnimationList;
         animationLists.insert(view, list);
     }
 
     list->append(state);
 }
 
 void DelegateAnimationHandler::restartAnimation(AnimationState *state)
 {
     startAnimation(state);
 }
 
 void DelegateAnimationHandler::startAnimation(AnimationState *state)
 {
     state->time.start();
     state->animating = true;
 
     if (!timer.isActive()) {
         timer.start(1000 / 30, this); // 30 fps
     }
 }
 
 int DelegateAnimationHandler::runAnimations(AnimationList *list, const QAbstractItemView *view)
 {
     int activeAnimations = 0;
     QRegion region;
 
     QMutableListIterator<AnimationState *> i(*list);
     while (i.hasNext()) {
         AnimationState *state = i.next();
 
         if (!state->animating) {
             continue;
         }
 
         // We need to make sure the index is still valid, since it could be removed
         // while the animation is running.
         if (state->index.isValid()) {
             bool finished = state->update();
             region += view->visualRect(state->index);
 
             if (!finished) {
                 activeAnimations++;
                 continue;
             }
         }
 
         // If the direction is Forward, the state object needs to stick around
         // after the animation has finished, so we know that we've already done
         // a "hover in" for the index.
         if (state->direction == QTimeLine::Backward || !state->index.isValid()) {
             delete state;
             i.remove();
         }
     }
 
     // Trigger a repaint of the animated indexes
     if (!region.isEmpty()) {
         const_cast<QAbstractItemView *>(view)->viewport()->update(region);
     }
 
     return activeAnimations;
 }
 
 void DelegateAnimationHandler::viewDeleted(QObject *view)
 {
     AnimationList *list = animationLists.take(static_cast<QAbstractItemView *>(view));
     qDeleteAll(*list);
     delete list;
 }
 
 void DelegateAnimationHandler::timerEvent(QTimerEvent *)
 {
     int activeAnimations = 0;
 
     AnimationListsIterator i(animationLists);
     while (i.hasNext()) {
         i.next();
         AnimationList *list = i.value();
         const QAbstractItemView *view = i.key();
 
         activeAnimations += runAnimations(list, view);
     }
 
     if (activeAnimations == 0 && timer.isActive()) {
         timer.stop();
     }
 }
 
 }
 
 #include "delegateanimationhandler.moc"