diff --git a/src/kitemviews/private/kitemlistsmoothscroller.cpp b/src/kitemviews/private/kitemlistsmoothscroller.cpp index 17eac3b39..77a842838 100644 --- a/src/kitemviews/private/kitemlistsmoothscroller.cpp +++ b/src/kitemviews/private/kitemlistsmoothscroller.cpp @@ -1,205 +1,211 @@ /*************************************************************************** * Copyright (C) 2011 by Peter Penz * * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * * This program is distributed in the hope that it will be useful, * * but WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU General Public License for more details. * * * * You should have received a copy of the GNU General Public License * * along with this program; if not, write to the * * Free Software Foundation, Inc., * * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * ***************************************************************************/ #include "kitemlistsmoothscroller.h" #include #include #include #include #include #include KItemListSmoothScroller::KItemListSmoothScroller(QScrollBar* scrollBar, QObject* parent) : QObject(parent), m_scrollBarPressed(false), m_smoothScrolling(true), m_scrollBar(scrollBar), m_animation(nullptr) { m_animation = new QPropertyAnimation(this); - const int duration = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, m_scrollBar) ? 100 : 1; - m_animation->setDuration(duration); +#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0) + const int animationDuration = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animation_Duration, nullptr, m_scrollBar); + const bool animationEnabled = (animationDuration > 0); + #else + const int animationDuration = 100; + const bool animationEnabled = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, m_scrollBar); +#endif + m_animation->setDuration(animationEnabled ? animationDuration : 1); connect(m_animation, &QPropertyAnimation::stateChanged, this, &KItemListSmoothScroller::slotAnimationStateChanged); m_scrollBar->installEventFilter(this); } KItemListSmoothScroller::~KItemListSmoothScroller() { } void KItemListSmoothScroller::setScrollBar(QScrollBar *scrollBar) { m_scrollBar = scrollBar; } QScrollBar* KItemListSmoothScroller::scrollBar() const { return m_scrollBar; } void KItemListSmoothScroller::setTargetObject(QObject* target) { m_animation->setTargetObject(target); } QObject* KItemListSmoothScroller::targetObject() const { return m_animation->targetObject(); } void KItemListSmoothScroller::setPropertyName(const QByteArray& propertyName) { m_animation->setPropertyName(propertyName); } QByteArray KItemListSmoothScroller::propertyName() const { return m_animation->propertyName(); } void KItemListSmoothScroller::scrollContentsBy(qreal distance) { QObject* target = targetObject(); if (!target) { return; } const QByteArray name = propertyName(); const qreal currentOffset = target->property(name).toReal(); if (static_cast(currentOffset) == m_scrollBar->value()) { // The current offset is already synchronous to the scrollbar return; } const bool animRunning = (m_animation->state() == QAbstractAnimation::Running); if (animRunning) { // Stopping a running animation means skipping the range from the current offset // until the target offset. To prevent skipping of the range the difference // is added to the new target offset. const qreal oldEndOffset = m_animation->endValue().toReal(); distance += (currentOffset - oldEndOffset); } const qreal endOffset = currentOffset - distance; if (m_smoothScrolling || animRunning) { qreal startOffset = currentOffset; if (animRunning) { // If the animation was running and has been interrupted by assigning a new end-offset // one frame must be added to the start-offset to keep the animation smooth. This also // assures that animation proceeds even in cases where new end-offset are triggered // within a very short timeslots. startOffset += (endOffset - currentOffset) * 1000 / (m_animation->duration() * 60); if (currentOffset < endOffset) { startOffset = qMin(startOffset, endOffset); } else { startOffset = qMax(startOffset, endOffset); } } m_animation->stop(); m_animation->setStartValue(startOffset); m_animation->setEndValue(endOffset); m_animation->setEasingCurve(animRunning ? QEasingCurve::OutQuad : QEasingCurve::InOutQuad); m_animation->start(); target->setProperty(name, startOffset); } else { target->setProperty(name, endOffset); } } void KItemListSmoothScroller::scrollTo(qreal position) { int newValue = position; newValue = qBound(0, newValue, m_scrollBar->maximum()); if (newValue != m_scrollBar->value()) { m_smoothScrolling = true; m_scrollBar->setValue(newValue); } } bool KItemListSmoothScroller::requestScrollBarUpdate(int newMaximum) { if (m_animation->state() == QAbstractAnimation::Running) { if (newMaximum == m_scrollBar->maximum()) { // The value has been changed by the animation, no update // of the scrollbars is required as their target state will be // reached with the end of the animation. return false; } // The maximum has been changed which indicates that the content // of the view has been changed. Stop the animation in any case and // update the scrollbars immediately. m_animation->stop(); } return true; } bool KItemListSmoothScroller::eventFilter(QObject* obj, QEvent* event) { Q_ASSERT(obj == m_scrollBar); switch (event->type()) { case QEvent::MouseButtonPress: m_scrollBarPressed = true; m_smoothScrolling = true; break; case QEvent::MouseButtonRelease: m_scrollBarPressed = false; m_smoothScrolling = false; break; case QEvent::Wheel: return false; // we're the ones sending them default: break; } return QObject::eventFilter(obj, event); } void KItemListSmoothScroller::slotAnimationStateChanged(QAbstractAnimation::State newState, QAbstractAnimation::State oldState) { Q_UNUSED(oldState); if (newState == QAbstractAnimation::Stopped && m_smoothScrolling && !m_scrollBarPressed) { m_smoothScrolling = false; } } void KItemListSmoothScroller::handleWheelEvent(QWheelEvent* event) { const bool previous = m_smoothScrolling; m_smoothScrolling = true; QWheelEvent copy = *event; QApplication::sendEvent(m_scrollBar, ©); event->setAccepted(copy.isAccepted()); m_smoothScrolling = previous; }