File indexing completed on 2024-04-21 03:57:51

 /*
     SPDX-FileCopyrightText: 2013 Dominik Haumann <dhaumann@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "katefadeeffect.h"
 
 #include <QGraphicsOpacityEffect>
 #include <QTimeLine>
 #include <QWidget>
 
 KateFadeEffect::KateFadeEffect(QWidget *widget)
     : QObject(widget)
     , m_widget(widget)
     , m_effect(nullptr) // effect only exists during fading animation
 {
     m_timeLine = new QTimeLine(500, this);
     m_timeLine->setUpdateInterval(40);
 
     connect(m_timeLine, &QTimeLine::valueChanged, this, &KateFadeEffect::opacityChanged);
     connect(m_timeLine, &QTimeLine::finished, this, &KateFadeEffect::animationFinished);
 }
 
 bool KateFadeEffect::isHideAnimationRunning() const
 {
     return (m_timeLine->direction() == QTimeLine::Backward) && (m_timeLine->state() == QTimeLine::Running);
 }
 
 bool KateFadeEffect::isShowAnimationRunning() const
 {
     return (m_timeLine->direction() == QTimeLine::Forward) && (m_timeLine->state() == QTimeLine::Running);
 }
 
 void KateFadeEffect::fadeIn()
 {
     // stop time line if still running
     if (m_timeLine->state() == QTimeLine::Running) {
         QTimeLine::Direction direction = m_timeLine->direction();
         m_timeLine->stop();
         if (direction == QTimeLine::Backward) {
             // fadeOut animation interrupted
             Q_EMIT hideAnimationFinished();
         }
     }
 
     // assign new graphics effect, old one is deleted in setGraphicsEffect()
     m_effect = new QGraphicsOpacityEffect(this);
     m_effect->setOpacity(0.0);
     m_widget->setGraphicsEffect(m_effect);
 
     // show widget and start fade in animation
     m_widget->show();
     m_timeLine->setDirection(QTimeLine::Forward);
     m_timeLine->start();
 }
 
 void KateFadeEffect::fadeOut()
 {
     // stop time line if still running
     if (m_timeLine->state() == QTimeLine::Running) {
         QTimeLine::Direction direction = m_timeLine->direction();
         m_timeLine->stop();
         if (direction == QTimeLine::Forward) {
             // fadeIn animation interrupted
             Q_EMIT showAnimationFinished();
         }
     }
 
     // assign new graphics effect, old one is deleted in setGraphicsEffect()
     m_effect = new QGraphicsOpacityEffect(this);
     m_effect->setOpacity(1.0);
     m_widget->setGraphicsEffect(m_effect);
 
     // start fade out animation
     m_timeLine->setDirection(QTimeLine::Backward);
     m_timeLine->start();
 }
 
 void KateFadeEffect::opacityChanged(qreal value)
 {
     Q_ASSERT(m_effect);
     m_effect->setOpacity(value);
 }
 
 void KateFadeEffect::animationFinished()
 {
     // fading finished: remove graphics effect, deletes the effect as well
     m_widget->setGraphicsEffect(nullptr);
     Q_ASSERT(!m_effect);
 
     if (m_timeLine->direction() == QTimeLine::Backward) {
         m_widget->hide();
         Q_EMIT hideAnimationFinished();
     } else {
         Q_EMIT showAnimationFinished();
     }
 }
 
 #include "moc_katefadeeffect.cpp"