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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit38be0d13830efd2d98281c645c3a60afe05ffece (patch)
tree6ea73f3ec77f7d153333779883e8120f82820abe /src/corelib/animation/qsequentialanimationgroup.cpp
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QSequentialAnimationGroup
+ \brief The QSequentialAnimationGroup class provides a sequential group of animations.
+ \since 4.6
+ \ingroup animation
+
+ QSequentialAnimationGroup is a QAnimationGroup that runs its
+ animations in sequence, i.e., it starts one animation after
+ another has finished playing. The animations are played in the
+ order they are added to the group (using
+ \l{QAnimationGroup::}{addAnimation()} or
+ \l{QAnimationGroup::}{insertAnimation()}). The animation group
+ finishes when its last animation has finished.
+
+ At each moment there is at most one animation that is active in
+ the group; it is returned by currentAnimation(). An empty group
+ has no current animation.
+
+ A sequential animation group can be treated as any other
+ animation, i.e., it can be started, stopped, and added to other
+ groups. You can also call addPause() or insertPause() to add a
+ pause to a sequential animation group.
+
+ \code
+ QSequentialAnimationGroup *group = new QSequentialAnimationGroup;
+
+ group->addAnimation(anim1);
+ group->addAnimation(anim2);
+
+ group->start();
+ \endcode
+
+ In this example, \c anim1 and \c anim2 are two already set up
+ \l{QPropertyAnimation}s.
+
+ \sa QAnimationGroup, QAbstractAnimation, {The Animation Framework}
+*/
+
+#include "qsequentialanimationgroup.h"
+#include "qsequentialanimationgroup_p.h"
+
+#include "qpauseanimation.h"
+
+#include <QtCore/qdebug.h>
+
+#ifndef QT_NO_ANIMATION
+
+QT_BEGIN_NAMESPACE
+
+bool QSequentialAnimationGroupPrivate::atEnd() const
+{
+ // we try to detect if we're at the end of the group
+ //this is true if the following conditions are true:
+ // 1. we're in the last loop
+ // 2. the direction is forward
+ // 3. the current animation is the last one
+ // 4. the current animation has reached its end
+ const int animTotalCurrentTime = QAbstractAnimationPrivate::get(currentAnimation)->totalCurrentTime;
+ return (currentLoop == loopCount - 1
+ && direction == QAbstractAnimation::Forward
+ && currentAnimation == animations.last()
+ && animTotalCurrentTime == animationActualTotalDuration(currentAnimationIndex));
+}
+
+int QSequentialAnimationGroupPrivate::animationActualTotalDuration(int index) const
+{
+ QAbstractAnimation *anim = animations.at(index);
+ int ret = anim->totalDuration();
+ if (ret == -1 && actualDuration.size() > index)
+ ret = actualDuration.at(index); //we can try the actual duration there
+ return ret;
+}
+
+QSequentialAnimationGroupPrivate::AnimationIndex QSequentialAnimationGroupPrivate::indexForCurrentTime() const
+{
+ Q_ASSERT(!animations.isEmpty());
+
+ AnimationIndex ret;
+ int duration = 0;
+
+ for (int i = 0; i < animations.size(); ++i) {
+ duration = animationActualTotalDuration(i);
+
+ // 'animation' is the current animation if one of these reasons is true:
+ // 1. it's duration is undefined
+ // 2. it ends after msecs
+ // 3. it is the last animation (this can happen in case there is at least 1 uncontrolled animation)
+ // 4. it ends exactly in msecs and the direction is backwards
+ if (duration == -1 || currentTime < (ret.timeOffset + duration)
+ || (currentTime == (ret.timeOffset + duration) && direction == QAbstractAnimation::Backward)) {
+ ret.index = i;
+ return ret;
+ }
+
+ // 'animation' has a non-null defined duration and is not the one at time 'msecs'.
+ ret.timeOffset += duration;
+ }
+
+ // this can only happen when one of those conditions is true:
+ // 1. the duration of the group is undefined and we passed its actual duration
+ // 2. there are only 0-duration animations in the group
+ ret.timeOffset -= duration;
+ ret.index = animations.size() - 1;
+ return ret;
+}
+
+void QSequentialAnimationGroupPrivate::restart()
+{
+ // restarting the group by making the first/last animation the current one
+ if (direction == QAbstractAnimation::Forward) {
+ lastLoop = 0;
+ if (currentAnimationIndex == 0)
+ activateCurrentAnimation();
+ else
+ setCurrentAnimation(0);
+ } else { // direction == QAbstractAnimation::Backward
+ lastLoop = loopCount - 1;
+ int index = animations.size() - 1;
+ if (currentAnimationIndex == index)
+ activateCurrentAnimation();
+ else
+ setCurrentAnimation(index);
+ }
+}
+
+/*!
+ \internal
+ This manages advancing the execution of a group running forwards (time has gone forward),
+ which is the same behaviour for rewinding the execution of a group running backwards
+ (time has gone backward).
+*/
+void QSequentialAnimationGroupPrivate::advanceForwards(const AnimationIndex &newAnimationIndex)
+{
+ if (lastLoop < currentLoop) {
+ // we need to fast forward to the end
+ for (int i = currentAnimationIndex; i < animations.size(); ++i) {
+ QAbstractAnimation *anim = animations.at(i);
+ setCurrentAnimation(i, true);
+ anim->setCurrentTime(animationActualTotalDuration(i));
+ }
+ // this will make sure the current animation is reset to the beginning
+ if (animations.size() == 1)
+ // we need to force activation because setCurrentAnimation will have no effect
+ activateCurrentAnimation();
+ else
+ setCurrentAnimation(0, true);
+ }
+
+ // and now we need to fast forward from the current position to
+ for (int i = currentAnimationIndex; i < newAnimationIndex.index; ++i) { //### WRONG,
+ QAbstractAnimation *anim = animations.at(i);
+ setCurrentAnimation(i, true);
+ anim->setCurrentTime(animationActualTotalDuration(i));
+ }
+ // setting the new current animation will happen later
+}
+
+/*!
+ \internal
+ This manages rewinding the execution of a group running forwards (time has gone forward),
+ which is the same behaviour for advancing the execution of a group running backwards
+ (time has gone backward).
+*/
+void QSequentialAnimationGroupPrivate::rewindForwards(const AnimationIndex &newAnimationIndex)
+{
+ if (lastLoop > currentLoop) {
+ // we need to fast rewind to the beginning
+ for (int i = currentAnimationIndex; i >= 0 ; --i) {
+ QAbstractAnimation *anim = animations.at(i);
+ setCurrentAnimation(i, true);
+ anim->setCurrentTime(0);
+ }
+ // this will make sure the current animation is reset to the end
+ if (animations.size() == 1)
+ // we need to force activation because setCurrentAnimation will have no effect
+ activateCurrentAnimation();
+ else
+ setCurrentAnimation(animations.count() - 1, true);
+ }
+
+ // and now we need to fast rewind from the current position to
+ for (int i = currentAnimationIndex; i > newAnimationIndex.index; --i) {
+ QAbstractAnimation *anim = animations.at(i);
+ setCurrentAnimation(i, true);
+ anim->setCurrentTime(0);
+ }
+ // setting the new current animation will happen later
+}
+
+/*!
+ \fn QSequentialAnimationGroup::currentAnimationChanged(QAbstractAnimation *current)
+
+ QSequentialAnimationGroup emits this signal when currentAnimation
+ has been changed. \a current is the current animation.
+
+ \sa currentAnimation()
+*/
+
+
+/*!
+ Constructs a QSequentialAnimationGroup.
+ \a parent is passed to QObject's constructor.
+*/
+QSequentialAnimationGroup::QSequentialAnimationGroup(QObject *parent)
+ : QAnimationGroup(*new QSequentialAnimationGroupPrivate, parent)
+{
+}
+
+/*!
+ \internal
+*/
+QSequentialAnimationGroup::QSequentialAnimationGroup(QSequentialAnimationGroupPrivate &dd,
+ QObject *parent)
+ : QAnimationGroup(dd, parent)
+{
+}
+
+/*!
+ Destroys the animation group. It will also destroy all its animations.
+*/
+QSequentialAnimationGroup::~QSequentialAnimationGroup()
+{
+}
+
+/*!
+ Adds a pause of \a msecs to this animation group.
+ The pause is considered as a special type of animation, thus
+ \l{QAnimationGroup::animationCount()}{animationCount} will be
+ increased by one.
+
+ \sa insertPause(), QAnimationGroup::addAnimation()
+*/
+QPauseAnimation *QSequentialAnimationGroup::addPause(int msecs)
+{
+ QPauseAnimation *pause = new QPauseAnimation(msecs);
+ addAnimation(pause);
+ return pause;
+}
+
+/*!
+ Inserts a pause of \a msecs milliseconds at \a index in this animation
+ group.
+
+ \sa addPause(), QAnimationGroup::insertAnimation()
+*/
+QPauseAnimation *QSequentialAnimationGroup::insertPause(int index, int msecs)
+{
+ Q_D(const QSequentialAnimationGroup);
+
+ if (index < 0 || index > d->animations.size()) {
+ qWarning("QSequentialAnimationGroup::insertPause: index is out of bounds");
+ return 0;
+ }
+
+ QPauseAnimation *pause = new QPauseAnimation(msecs);
+ insertAnimation(index, pause);
+ return pause;
+}
+
+
+/*!
+ \property QSequentialAnimationGroup::currentAnimation
+ Returns the animation in the current time.
+
+ \sa currentAnimationChanged()
+*/
+QAbstractAnimation *QSequentialAnimationGroup::currentAnimation() const
+{
+ Q_D(const QSequentialAnimationGroup);
+ return d->currentAnimation;
+}
+
+/*!
+ \reimp
+*/
+int QSequentialAnimationGroup::duration() const
+{
+ Q_D(const QSequentialAnimationGroup);
+ int ret = 0;
+
+ for (int i = 0; i < d->animations.size(); ++i) {
+ QAbstractAnimation *animation = d->animations.at(i);
+ const int currentDuration = animation->totalDuration();
+ if (currentDuration == -1)
+ return -1; // Undetermined length
+
+ ret += currentDuration;
+ }
+
+ return ret;
+}
+
+/*!
+ \reimp
+*/
+void QSequentialAnimationGroup::updateCurrentTime(int currentTime)
+{
+ Q_D(QSequentialAnimationGroup);
+ if (!d->currentAnimation)
+ return;
+
+ const QSequentialAnimationGroupPrivate::AnimationIndex newAnimationIndex = d->indexForCurrentTime();
+
+ // remove unneeded animations from actualDuration list
+ while (newAnimationIndex.index < d->actualDuration.size())
+ d->actualDuration.removeLast();
+
+ // newAnimationIndex.index is the new current animation
+ if (d->lastLoop < d->currentLoop
+ || (d->lastLoop == d->currentLoop && d->currentAnimationIndex < newAnimationIndex.index)) {
+ // advancing with forward direction is the same as rewinding with backwards direction
+ d->advanceForwards(newAnimationIndex);
+ } else if (d->lastLoop > d->currentLoop
+ || (d->lastLoop == d->currentLoop && d->currentAnimationIndex > newAnimationIndex.index)) {
+ // rewinding with forward direction is the same as advancing with backwards direction
+ d->rewindForwards(newAnimationIndex);
+ }
+
+ d->setCurrentAnimation(newAnimationIndex.index);
+
+ const int newCurrentTime = currentTime - newAnimationIndex.timeOffset;
+
+ if (d->currentAnimation) {
+ d->currentAnimation->setCurrentTime(newCurrentTime);
+ if (d->atEnd()) {
+ //we make sure that we don't exceed the duration here
+ d->currentTime += QAbstractAnimationPrivate::get(d->currentAnimation)->totalCurrentTime - newCurrentTime;
+ stop();
+ }
+ } else {
+ //the only case where currentAnimation could be null
+ //is when all animations have been removed
+ Q_ASSERT(d->animations.isEmpty());
+ d->currentTime = 0;
+ stop();
+ }
+
+ d->lastLoop = d->currentLoop;
+}
+
+/*!
+ \reimp
+*/
+void QSequentialAnimationGroup::updateState(QAbstractAnimation::State newState,
+ QAbstractAnimation::State oldState)
+{
+ Q_D(QSequentialAnimationGroup);
+ QAnimationGroup::updateState(newState, oldState);
+
+ if (!d->currentAnimation)
+ return;
+
+ switch (newState) {
+ case Stopped:
+ d->currentAnimation->stop();
+ break;
+ case Paused:
+ if (oldState == d->currentAnimation->state()
+ && oldState == QSequentialAnimationGroup::Running) {
+ d->currentAnimation->pause();
+ }
+ else
+ d->restart();
+ break;
+ case Running:
+ if (oldState == d->currentAnimation->state()
+ && oldState == QSequentialAnimationGroup::Paused)
+ d->currentAnimation->start();
+ else
+ d->restart();
+ break;
+ }
+}
+
+/*!
+ \reimp
+*/
+void QSequentialAnimationGroup::updateDirection(QAbstractAnimation::Direction direction)
+{
+ Q_D(QSequentialAnimationGroup);
+ // we need to update the direction of the current animation
+ if (state() != Stopped && d->currentAnimation)
+ d->currentAnimation->setDirection(direction);
+}
+
+/*!
+ \reimp
+*/
+bool QSequentialAnimationGroup::event(QEvent *event)
+{
+ return QAnimationGroup::event(event);
+}
+
+void QSequentialAnimationGroupPrivate::setCurrentAnimation(int index, bool intermediate)
+{
+ Q_Q(QSequentialAnimationGroup);
+
+ index = qMin(index, animations.count() - 1);
+
+ if (index == -1) {
+ Q_ASSERT(animations.isEmpty());
+ currentAnimationIndex = -1;
+ currentAnimation = 0;
+ return;
+ }
+
+ // need these two checks below because this func can be called after the current animation
+ // has been removed
+ if (index == currentAnimationIndex && animations.at(index) == currentAnimation)
+ return;
+
+ // stop the old current animation
+ if (currentAnimation)
+ currentAnimation->stop();
+
+ currentAnimation = animations.at(index);
+ currentAnimationIndex = index;
+
+ emit q->currentAnimationChanged(currentAnimation);
+
+ activateCurrentAnimation(intermediate);
+}
+
+void QSequentialAnimationGroupPrivate::activateCurrentAnimation(bool intermediate)
+{
+ if (!currentAnimation || state == QSequentialAnimationGroup::Stopped)
+ return;
+
+ currentAnimation->stop();
+
+ // we ensure the direction is consistent with the group's direction
+ currentAnimation->setDirection(direction);
+
+ // connects to the finish signal of uncontrolled animations
+ if (currentAnimation->totalDuration() == -1)
+ connectUncontrolledAnimation(currentAnimation);
+
+ currentAnimation->start();
+ if (!intermediate && state == QSequentialAnimationGroup::Paused)
+ currentAnimation->pause();
+}
+
+void QSequentialAnimationGroupPrivate::_q_uncontrolledAnimationFinished()
+{
+ Q_Q(QSequentialAnimationGroup);
+ Q_ASSERT(qobject_cast<QAbstractAnimation *>(q->sender()) == currentAnimation);
+
+ // we trust the duration returned by the animation
+ while (actualDuration.size() < (currentAnimationIndex + 1))
+ actualDuration.append(-1);
+ actualDuration[currentAnimationIndex] = currentAnimation->currentTime();
+
+ disconnectUncontrolledAnimation(currentAnimation);
+
+ if ((direction == QAbstractAnimation::Forward && currentAnimation == animations.last())
+ || (direction == QAbstractAnimation::Backward && currentAnimationIndex == 0)) {
+ // we don't handle looping of a group with undefined duration
+ q->stop();
+ } else if (direction == QAbstractAnimation::Forward) {
+ // set the current animation to be the next one
+ setCurrentAnimation(currentAnimationIndex + 1);
+ } else {
+ // set the current animation to be the previous one
+ setCurrentAnimation(currentAnimationIndex - 1);
+ }
+}
+
+/*!
+ \internal
+ This method is called whenever an animation is added to
+ the group at index \a index.
+ Note: We only support insertion after the current animation
+*/
+void QSequentialAnimationGroupPrivate::animationInsertedAt(int index)
+{
+ if (currentAnimation == 0)
+ setCurrentAnimation(0); // initialize the current animation
+
+ if (currentAnimationIndex == index
+ && currentAnimation->currentTime() == 0 && currentAnimation->currentLoop() == 0) {
+ //in this case we simply insert an animation before the current one has actually started
+ setCurrentAnimation(index);
+ }
+
+ //we update currentAnimationIndex in case it has changed (the animation pointer is still valid)
+ currentAnimationIndex = animations.indexOf(currentAnimation);
+
+ if (index < currentAnimationIndex || currentLoop != 0) {
+ qWarning("QSequentialGroup::insertAnimation only supports to add animations after the current one.");
+ return; //we're not affected because it is added after the current one
+ }
+}
+
+/*!
+ \internal
+ This method is called whenever an animation is removed from
+ the group at index \a index. The animation is no more listed when this
+ method is called.
+*/
+void QSequentialAnimationGroupPrivate::animationRemoved(int index, QAbstractAnimation *anim)
+{
+ Q_Q(QSequentialAnimationGroup);
+ QAnimationGroupPrivate::animationRemoved(index, anim);
+
+ Q_ASSERT(currentAnimation); // currentAnimation should always be set
+
+ if (actualDuration.size() > index)
+ actualDuration.removeAt(index);
+
+ const int currentIndex = animations.indexOf(currentAnimation);
+ if (currentIndex == -1) {
+ //we're removing the current animation
+
+ disconnectUncontrolledAnimation(currentAnimation);
+
+ if (index < animations.count())
+ setCurrentAnimation(index); //let's try to take the next one
+ else if (index > 0)
+ setCurrentAnimation(index - 1);
+ else// case all animations were removed
+ setCurrentAnimation(-1);
+ } else if (currentAnimationIndex > index) {
+ currentAnimationIndex--;
+ }
+
+ // duration of the previous animations up to the current animation
+ currentTime = 0;
+ for (int i = 0; i < currentAnimationIndex; ++i) {
+ const int current = animationActualTotalDuration(i);
+ currentTime += current;
+ }
+
+ if (currentIndex != -1) {
+ //the current animation is not the one being removed
+ //so we add its current time to the current time of this group
+ currentTime += QAbstractAnimationPrivate::get(currentAnimation)->totalCurrentTime;
+ }
+
+ //let's also update the total current time
+ totalCurrentTime = currentTime + loopCount * q->duration();
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qsequentialanimationgroup.cpp"
+
+#endif //QT_NO_ANIMATION