gallerytransitions.cpp

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#include "gallerytransitions.h"
 
#include <utility>
 
#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythrandom.h"
 
#define LOC QString("Transition: ")
 
 
Transition::Transition(const QString& name)
  : m_duration(gCoreContext->GetDurSetting<std::chrono::milliseconds>("GalleryTransitionTime", 1s))
{
    setObjectName(name);
}
 
 
Transition &TransitionRegistry::Select(int setting)
{
    // Guard against garbage
    int value = (setting >= kNoTransition && setting < kLastTransSentinel)
            ? setting : kNoTransition;
 
    // If chosen transition isn't viable for painter then use previous ones.
    // First transition must always be useable by all painters
    Transition *result = nullptr;
    do
        result = m_map.value(value--, nullptr);
    while (value >= kNoTransition && !result);
 
    if (result)
        return *result;
 
    LOG(VB_GENERAL, LOG_CRIT,
        LOC + QString("No transitions found for setting %1").arg(setting));
 
    return m_immediate;
}
 
 
TransitionRegistry::TransitionRegistry(bool includeAnimations)
{
    // Create all non-animated transitions to be used by Random
    m_map.insert(kBlendTransition, new TransitionBlend());
    m_map.insert(kSlideTransition, new TransitionSlide());
 
    // Create all animated transitions to be used by Random
    if (includeAnimations)
    {
        m_map.insert(kTwistTransition, new TransitionTwist());
        m_map.insert(kZoomTransition,  new TransitionZoom());
        m_map.insert(kSpinTransition,  new TransitionSpin());
    }
 
    // Create random set from those already defined
    m_map.insert(kRandomTransition, new TransitionRandom(m_map.values()));
 
    // Create other transitions that aren't to be used by Random
    m_map.insert(kNoTransition, new TransitionNone());
}
 
 
void Transition::Start(Slide &from, Slide &to,
                       bool forwards, float speed)
{
    LOG(VB_FILE, LOG_DEBUG, LOC +
        QString("Starting transition %1 -> %2 (forwards= %3, speed= %4)")
        .arg(from.objectName(), to.objectName()).arg(forwards).arg(speed));
 
    m_old = &from;
    m_new = &to;
 
    // When playing forwards next image replaces prev image
    // When playing backwards prev image replaces next image
    m_prev  = forwards ? m_old : m_new;
    m_next = forwards ? m_new : m_old;
 
    // Set up transition
    Initialise();
 
    // Make new image visible
    m_new->SetVisible(true);
}
 
 
void Transition::Finished()
{
    // Hide old image before it is reset
    m_old->SetVisible(false);
 
    // Undo transition effects
    Finalise();
 
    LOG(VB_FILE, LOG_DEBUG, LOC +
        QString("Finished transition to %1").arg(m_new->objectName()));
 
    emit finished();
}
 
 
void TransitionNone::Start(Slide &from, Slide &to,
                           bool forwards, float speed)
{
    Transition::Start(from, to, forwards, speed);
 
    // Finish immediately
    Finished();
}
 
 
GroupTransition::GroupTransition(GroupAnimation *animation, const QString& name)
    : Transition(name), m_animation(animation)
{
    // Complete transition when the group finishes
    connect(m_animation, &AbstractAnimation::finished, this, &GroupTransition::Finished);
}
 
 
GroupTransition::~GroupTransition()
{
    // Group owns animation
    delete m_animation;
}
 
 
void GroupTransition::Start(Slide &from, Slide &to,
                            bool forwards, float speed)
{
    // Clear previous transition
    m_animation->Clear();
 
    Transition::Start(from, to, forwards, speed);
 
    // Start group
    m_animation->Start(forwards, speed);
}
 
 
void GroupTransition::SetSpeed(float speed)
{
    if (m_animation)
        m_animation->SetSpeed(speed);
}
 
 
void GroupTransition::Pulse()
{
    if (m_animation)
        m_animation->Pulse();
}
 
 
void TransitionBlend::Initialise()
{
    // Fade out prev image
    auto *oldPic = new Animation(m_prev, Animation::Alpha);
    oldPic->Set(255, 0, m_duration, QEasingCurve::InOutQuad);
    m_animation->Add(oldPic);
 
    // Fade in next image
    auto *newPic = new Animation(m_next, Animation::Alpha);
    newPic->Set(0, 255, m_duration, QEasingCurve::InOutQuad);
    m_animation->Add(newPic);
 
    // Hide new image until it's needed
    m_new->SetAlpha(0);
}
 
 
void TransitionBlend::Finalise()
{
    // Undo effects of the transition
    m_old->SetAlpha(255);
}
 
 
void TransitionTwist::Initialise()
{
    // Reduce hzoom of left image to nothing
    auto *oldPic = new Animation(m_prev, Animation::HorizontalZoom);
    oldPic->Set(1.0, 0.0, m_duration / 2, QEasingCurve::InQuart);
    m_animation->Add(oldPic);
 
    // Increase hzoom of right image from nothing to full
    auto *newPic = new Animation(m_next, Animation::HorizontalZoom);
    newPic->Set(0.0, 1.0, m_duration / 2, QEasingCurve::OutQuart);
    m_animation->Add(newPic);
 
    // Hide new image until it's needed
    m_new->SetHorizontalZoom(0);
}
 
 
void TransitionTwist::Finalise()
{
    // Undo effects of the transition
    m_old->SetHorizontalZoom(1.0);
}
 
 
void TransitionSlide::Initialise()
{
    // Both images are same size
    int width = m_old->GetArea().width();
 
    // Slide off to left
    auto *oldPic = new Animation(m_prev, Animation::Position);
    oldPic->Set(QPoint(0, 0), QPoint(-width, 0), m_duration, QEasingCurve::InOutQuart);
    m_animation->Add(oldPic);
 
    // Slide in from right
    auto *newPic = new Animation(m_next, Animation::Position);
    newPic->Set(QPoint(width, 0), QPoint(0, 0), m_duration, QEasingCurve::InOutQuart);
    m_animation->Add(newPic);
 
    // Hide new image until it's needed
    m_new->SetPosition(width, 0);
}
 
 
void TransitionSlide::Finalise()
{
    // Undo effects of the transition
    m_old->SetPosition(0,0);
}
 
 
void TransitionZoom::Initialise()
{
    // Both images are same size
    int width = m_old->GetArea().width();
 
    // Zoom away to left
    auto *oldZoom = new Animation(m_prev, Animation::Zoom);
    oldZoom->Set(1.0, 0.0, m_duration, QEasingCurve::OutQuad);
    m_animation->Add(oldZoom);
 
    auto *oldMove = new Animation(m_prev, Animation::Position);
    oldMove->Set(QPoint(0, 0), QPoint(-width / 2, 0), m_duration,
                 QEasingCurve::InQuad);
    m_animation->Add(oldMove);
 
    // Zoom in from right
    auto *newZoom = new Animation(m_next, Animation::Zoom);
    newZoom->Set(0.0, 1.0, m_duration, QEasingCurve::InQuad);
    m_animation->Add(newZoom);
 
    auto *newMove = new Animation(m_next, Animation::Position);
    newMove->Set(QPoint(width / 2, 0), QPoint(0, 0), m_duration,
                 QEasingCurve::OutQuad);
    m_animation->Add(newMove);
 
    // Hide new image until it's needed
    m_new->SetZoom(0.0);
}
 
 
void TransitionZoom::Finalise()
{
    // Undo effects of the transition
    m_old->SetZoom(1.0);
    m_old->SetPosition(0, 0);
}
 
 
void TransitionSpin::Initialise()
{
    // Set up blend
    TransitionBlend::Initialise();
 
    // Add simultaneous spin
    auto *an = new Animation(m_prev, Animation::Angle);
    an->Set(0.0, 360.1, m_duration, QEasingCurve::InOutQuad);
    m_animation->Add(an);
 
    an = new Animation(m_next, Animation::Angle);
    an->Set(0.0, 360.1, m_duration, QEasingCurve::InOutQuad);
    m_animation->Add(an);
 
    // Zoom prev away, then back
    auto *seq = new SequentialAnimation();
    m_animation->Add(seq);
 
    an = new Animation(m_prev, Animation::Zoom);
    an->Set(1.0, 0.5, m_duration / 2, QEasingCurve::InOutQuad);
    seq->Add(an);
 
    an = new Animation(m_prev, Animation::Zoom);
    an->Set(0.5, 1.0, m_duration / 2, QEasingCurve::InOutQuad);
    seq->Add(an);
 
    // Zoom next away, then back
    seq = new SequentialAnimation();
    m_animation->Add(seq);
 
    an = new Animation(m_next, Animation::Zoom);
    an->Set(1.0, 0.5, m_duration / 2, QEasingCurve::InOutQuad);
    seq->Add(an);
 
    an = new Animation(m_next, Animation::Zoom);
    an->Set(0.5, 1.0, m_duration / 2, QEasingCurve::InOutQuad);
    seq->Add(an);
}
 
 
void TransitionSpin::Finalise()
{
    // Undo blend
    TransitionBlend::Finalise();
 
    // Undo effects of the transition
    m_old->SetZoom(1.0);
    m_old->SetAngle(0.0);
}
 
 
void TransitionRandom::Start(Slide &from, Slide &to, bool forwards, float speed)
{
    // Select a random peer.
    int rand = MythRandom(0, m_peers.size() - 1);
    m_current = m_peers[rand];
    // Invoke peer
    connect(m_current, &Transition::finished, this, &TransitionRandom::Finished);
    m_current->Start(from, to, forwards, speed);
}
 
 
void TransitionRandom::Finished()
{
    // Clean up
    disconnect(m_current, nullptr, nullptr, nullptr);
    m_current = nullptr;
    emit finished();
}