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Diffstat (limited to 'src/kitemviews/kitemlistsmoothscroller.cpp')
| -rw-r--r-- | src/kitemviews/kitemlistsmoothscroller.cpp | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/src/kitemviews/kitemlistsmoothscroller.cpp b/src/kitemviews/kitemlistsmoothscroller.cpp deleted file mode 100644 index 80f7f2883..000000000 --- a/src/kitemviews/kitemlistsmoothscroller.cpp +++ /dev/null @@ -1,207 +0,0 @@ -/*************************************************************************** - * Copyright (C) 2011 by Peter Penz <[email protected]> * - * * - * 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_p.h" - -#include <KGlobalSettings> -#include <QEvent> -#include <QPropertyAnimation> -#include <QScrollBar> -#include <QWheelEvent> - -#include <KDebug> - -KItemListSmoothScroller::KItemListSmoothScroller(QScrollBar* scrollBar, - QObject* parent) : - QObject(parent), - m_scrollBarPressed(false), - m_smoothScrolling(true), - m_scrollBar(scrollBar), - m_animation(0) -{ - m_animation = new QPropertyAnimation(this); - const int duration = (KGlobalSettings::graphicEffectsLevel() == KGlobalSettings::NoEffects) ? 1 : 100; - m_animation->setDuration(duration); - connect(m_animation, SIGNAL(stateChanged(QAbstractAnimation::State,QAbstractAnimation::State)), - this, SLOT(slotAnimationStateChanged(QAbstractAnimation::State,QAbstractAnimation::State))); - - 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<int>(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) -{ - m_smoothScrolling = true; - m_scrollBar->setValue(position); -} - -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: - handleWheelEvent(static_cast<QWheelEvent*>(event)); - break; - - 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 int numDegrees = event->delta() / 8; - const int numSteps = numDegrees / 15; - - const bool previous = m_smoothScrolling; - - m_smoothScrolling = true; - const int value = m_scrollBar->value(); - const int pageStep = m_scrollBar->pageStep(); - m_scrollBar->setValue(value - numSteps * pageStep); - - m_smoothScrolling = previous; - - event->accept(); -} - -#include "kitemlistsmoothscroller_p.moc" |