--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/declarative/util/qdeclarativesmoothedanimation.cpp Tue Jul 06 15:10:48 2010 +0300
@@ -0,0 +1,482 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qdeclarativesmoothedanimation_p.h"
+#include "private/qdeclarativesmoothedanimation_p_p.h"
+
+#include "private/qdeclarativeanimation_p_p.h"
+
+#include <qdeclarativeproperty.h>
+#include "private/qdeclarativeproperty_p.h"
+
+#include "private/qdeclarativeglobal_p.h"
+
+#include <QtCore/qdebug.h>
+
+#include <math.h>
+
+#define DELAY_STOP_TIMER_INTERVAL 32
+
+QT_BEGIN_NAMESPACE
+
+QSmoothedAnimation::QSmoothedAnimation(QObject *parent)
+ : QAbstractAnimation(parent), to(0), velocity(200), userDuration(-1), maximumEasingTime(-1),
+ reversingMode(QDeclarativeSmoothedAnimation::Eased), initialVelocity(0),
+ trackVelocity(0), initialValue(0), invert(false), finalDuration(-1), lastTime(0)
+{
+ delayedStopTimer.setInterval(DELAY_STOP_TIMER_INTERVAL);
+ delayedStopTimer.setSingleShot(true);
+ connect(&delayedStopTimer, SIGNAL(timeout()), this, SLOT(stop()));
+}
+
+void QSmoothedAnimation::restart()
+{
+ initialVelocity = trackVelocity;
+ if (state() != QAbstractAnimation::Running)
+ start();
+ else
+ init();
+}
+
+void QSmoothedAnimation::updateState(QAbstractAnimation::State newState, QAbstractAnimation::State /*oldState*/)
+{
+ if (newState == QAbstractAnimation::Running)
+ init();
+}
+
+void QSmoothedAnimation::delayedStop()
+{
+ if (!delayedStopTimer.isActive())
+ delayedStopTimer.start();
+}
+
+int QSmoothedAnimation::duration() const
+{
+ return -1;
+}
+
+bool QSmoothedAnimation::recalc()
+{
+ s = to - initialValue;
+ vi = initialVelocity;
+
+ s = (invert? -1.0: 1.0) * s;
+
+ if (userDuration > 0 && velocity > 0) {
+ tf = s / velocity;
+ if (tf > (userDuration / 1000.)) tf = (userDuration / 1000.);
+ } else if (userDuration > 0) {
+ tf = userDuration / 1000.;
+ } else if (velocity > 0) {
+ tf = s / velocity;
+ } else {
+ return false;
+ }
+
+ finalDuration = ceil(tf * 1000.0);
+
+ if (maximumEasingTime == 0) {
+ a = 0;
+ d = 0;
+ tp = 0;
+ td = tf;
+ vp = velocity;
+ sp = 0;
+ sd = s;
+ } else if (maximumEasingTime != -1 && tf > (maximumEasingTime / 1000.)) {
+ qreal met = maximumEasingTime / 1000.;
+ td = tf - met;
+
+ qreal c1 = td;
+ qreal c2 = (tf - td) * vi - tf * velocity;
+ qreal c3 = -0.5 * (tf - td) * vi * vi;
+
+ qreal vp1 = (-c2 + sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1);
+
+ vp = vp1;
+ a = vp / met;
+ d = a;
+ tp = (vp - vi) / a;
+ sp = vi * tp + 0.5 * a * tp * tp;
+ sd = sp + (td - tp) * vp;
+ } else {
+ qreal c1 = 0.25 * tf * tf;
+ qreal c2 = 0.5 * vi * tf - s;
+ qreal c3 = -0.25 * vi * vi;
+
+ qreal a1 = (-c2 + sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1);
+
+ qreal tp1 = 0.5 * tf - 0.5 * vi / a1;
+ qreal vp1 = a1 * tp1 + vi;
+
+ qreal sp1 = 0.5 * a1 * tp1 * tp1 + vi * tp1;
+
+ a = a1;
+ d = a1;
+ tp = tp1;
+ td = tp1;
+ vp = vp1;
+ sp = sp1;
+ sd = sp1;
+ }
+ return true;
+}
+
+qreal QSmoothedAnimation::easeFollow(qreal time_seconds)
+{
+ qreal value;
+ if (time_seconds < tp) {
+ trackVelocity = vi + time_seconds * a;
+ value = 0.5 * a * time_seconds * time_seconds + vi * time_seconds;
+ } else if (time_seconds < td) {
+ time_seconds -= tp;
+ trackVelocity = vp;
+ value = sp + time_seconds * vp;
+ } else if (time_seconds < tf) {
+ time_seconds -= td;
+ trackVelocity = vp - time_seconds * a;
+ value = sd - 0.5 * d * time_seconds * time_seconds + vp * time_seconds;
+ } else {
+ trackVelocity = 0;
+ value = s;
+ delayedStop();
+ }
+
+ // to normalize 's' between [0..1], divide 'value' by 's'
+ return value;
+}
+
+void QSmoothedAnimation::updateCurrentTime(int t)
+{
+ qreal time_seconds = qreal(t - lastTime) / 1000.;
+
+ qreal value = easeFollow(time_seconds);
+ value *= (invert? -1.0: 1.0);
+ QDeclarativePropertyPrivate::write(target, initialValue + value,
+ QDeclarativePropertyPrivate::BypassInterceptor
+ | QDeclarativePropertyPrivate::DontRemoveBinding);
+}
+
+void QSmoothedAnimation::init()
+{
+ if (velocity == 0) {
+ stop();
+ return;
+ }
+
+ if (delayedStopTimer.isActive())
+ delayedStopTimer.stop();
+
+ initialValue = target.read().toReal();
+ lastTime = this->currentTime();
+
+ if (to == initialValue) {
+ stop();
+ return;
+ }
+
+ bool hasReversed = trackVelocity != 0. &&
+ ((trackVelocity > 0) == ((initialValue - to) > 0));
+
+ if (hasReversed) {
+ switch (reversingMode) {
+ default:
+ case QDeclarativeSmoothedAnimation::Eased:
+ break;
+ case QDeclarativeSmoothedAnimation::Sync:
+ QDeclarativePropertyPrivate::write(target, to,
+ QDeclarativePropertyPrivate::BypassInterceptor
+ | QDeclarativePropertyPrivate::DontRemoveBinding);
+ stop();
+ return;
+ case QDeclarativeSmoothedAnimation::Immediate:
+ initialVelocity = 0;
+ delayedStop();
+ break;
+ }
+ }
+
+ trackVelocity = initialVelocity;
+
+ invert = (to < initialValue);
+
+ if (!recalc()) {
+ QDeclarativePropertyPrivate::write(target, to,
+ QDeclarativePropertyPrivate::BypassInterceptor
+ | QDeclarativePropertyPrivate::DontRemoveBinding);
+ stop();
+ return;
+ }
+}
+
+/*!
+ \qmlclass SmoothedAnimation QDeclarativeSmoothedAnimation
+ \since 4.7
+ \inherits NumberAnimation
+ \brief The SmoothedAnimation element allows a property to smoothly track a value.
+
+ The SmoothedAnimation animates a property's value to a set target value
+ using an ease in/out quad easing curve. If the animation is restarted
+ with a different target value, the easing curves used to animate to the old
+ and the new target values are smoothly spliced together to avoid any obvious
+ visual glitches by maintaining the current velocity.
+
+ The property animation is configured by setting the velocity at which the
+ animation should occur, or the duration that the animation should take.
+ If both a velocity and a duration are specified, the one that results in
+ the quickest animation is chosen for each change in the target value.
+
+ For example, animating from 0 to 800 will take 4 seconds if a velocity
+ of 200 is set, will take 8 seconds with a duration of 8000 set, and will
+ take 4 seconds with both a velocity of 200 and a duration of 8000 set.
+ Animating from 0 to 20000 will take 10 seconds if a velocity of 200 is set,
+ will take 8 seconds with a duration of 8000 set, and will take 8 seconds
+ with both a velocity of 200 and a duration of 8000 set.
+
+ The follow example shows one rectangle tracking the position of another.
+\code
+import Qt 4.7
+
+Rectangle {
+ width: 800; height: 600; color: "blue"
+
+ Rectangle {
+ color: "green"
+ width: 60; height: 60;
+ x: rect1.x - 5; y: rect1.y - 5;
+ Behavior on x { SmoothedAnimation { velocity: 200 } }
+ Behavior on y { SmoothedAnimation { velocity: 200 } }
+ }
+
+ Rectangle {
+ id: rect1
+ color: "red"
+ width: 50; height: 50;
+ }
+
+ focus: true
+ Keys.onRightPressed: rect1.x = rect1.x + 100
+ Keys.onLeftPressed: rect1.x = rect1.x - 100
+ Keys.onUpPressed: rect1.y = rect1.y - 100
+ Keys.onDownPressed: rect1.y = rect1.y + 100
+}
+\endcode
+
+ The default velocity of SmoothedAnimation is 200 units/second. Note that if the range of the
+ value being animated is small, then the velocity will need to be adjusted
+ appropriately. For example, the opacity of an item ranges from 0 - 1.0.
+ To enable a smooth animation in this range the velocity will need to be
+ set to a value such as 0.5 units/second. Animating from 0 to 1.0 with a velocity
+ of 0.5 will take 2000 ms to complete.
+
+ \sa SpringFollow
+*/
+
+QDeclarativeSmoothedAnimation::QDeclarativeSmoothedAnimation(QObject *parent)
+: QDeclarativeNumberAnimation(*(new QDeclarativeSmoothedAnimationPrivate), parent)
+{
+}
+
+QDeclarativeSmoothedAnimation::~QDeclarativeSmoothedAnimation()
+{
+}
+
+QDeclarativeSmoothedAnimationPrivate::QDeclarativeSmoothedAnimationPrivate()
+ : wrapperGroup(new QParallelAnimationGroup), anim(new QSmoothedAnimation)
+{
+ Q_Q(QDeclarativeSmoothedAnimation);
+ QDeclarative_setParent_noEvent(wrapperGroup, q);
+ QDeclarative_setParent_noEvent(anim, q);
+}
+
+QAbstractAnimation* QDeclarativeSmoothedAnimation::qtAnimation()
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ return d->wrapperGroup;
+}
+
+void QDeclarativeSmoothedAnimation::transition(QDeclarativeStateActions &actions,
+ QDeclarativeProperties &modified,
+ TransitionDirection direction)
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ QDeclarativeNumberAnimation::transition(actions, modified, direction);
+
+ if (!d->actions)
+ return;
+
+ QSet<QAbstractAnimation*> anims;
+ for (int i = 0; i < d->actions->size(); i++) {
+ QSmoothedAnimation *ease;
+ bool needsRestart;
+ if (!d->activeAnimations.contains((*d->actions)[i].property)) {
+ ease = new QSmoothedAnimation();
+ d->wrapperGroup->addAnimation(ease);
+ d->activeAnimations.insert((*d->actions)[i].property, ease);
+ needsRestart = false;
+ } else {
+ ease = d->activeAnimations.value((*d->actions)[i].property);
+ needsRestart = true;
+ }
+
+ ease->target = (*d->actions)[i].property;
+ ease->to = (*d->actions)[i].toValue.toReal();
+
+ // copying public members from main value holder animation
+ ease->maximumEasingTime = d->anim->maximumEasingTime;
+ ease->reversingMode = d->anim->reversingMode;
+ ease->velocity = d->anim->velocity;
+ ease->userDuration = d->anim->userDuration;
+
+ ease->initialVelocity = ease->trackVelocity;
+
+ if (needsRestart)
+ ease->init();
+ anims.insert(ease);
+ }
+
+ for (int i = d->wrapperGroup->animationCount() - 1; i >= 0 ; --i) {
+ if (!anims.contains(d->wrapperGroup->animationAt(i))) {
+ QSmoothedAnimation *ease = static_cast<QSmoothedAnimation*>(d->wrapperGroup->animationAt(i));
+ d->activeAnimations.remove(ease->target);
+ d->wrapperGroup->takeAnimation(i);
+ delete ease;
+ }
+ }
+}
+
+/*!
+ \qmlproperty enumeration SmoothedAnimation::reversingMode
+
+ Sets how the SmoothedAnimation behaves if an animation direction is reversed.
+
+ If reversing mode is \c SmoothedAnimation.Eased, the animation will smoothly decelerate, and
+ then reverse direction. If the reversing mode is \c SmoothedAnimation.Immediate, the
+ animation will immediately begin accelerating in the reverse direction,
+ begining with a velocity of 0. If the reversing mode is \c SmoothedAnimation.Sync, the
+ property is immediately set to the target value.
+*/
+QDeclarativeSmoothedAnimation::ReversingMode QDeclarativeSmoothedAnimation::reversingMode() const
+{
+ Q_D(const QDeclarativeSmoothedAnimation);
+ return (QDeclarativeSmoothedAnimation::ReversingMode) d->anim->reversingMode;
+}
+
+void QDeclarativeSmoothedAnimation::setReversingMode(ReversingMode m)
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ if (d->anim->reversingMode == m)
+ return;
+
+ d->anim->reversingMode = m;
+ emit reversingModeChanged();
+}
+
+/*!
+ \qmlproperty int SmoothedAnimation::duration
+
+ This property holds the animation duration, in msecs, used when tracking the source.
+
+ Setting this to -1 (the default) disables the duration value.
+*/
+int QDeclarativeSmoothedAnimation::duration() const
+{
+ Q_D(const QDeclarativeSmoothedAnimation);
+ return d->anim->userDuration;
+}
+
+void QDeclarativeSmoothedAnimation::setDuration(int duration)
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ if (duration != -1)
+ QDeclarativeNumberAnimation::setDuration(duration);
+ d->anim->userDuration = duration;
+}
+
+qreal QDeclarativeSmoothedAnimation::velocity() const
+{
+ Q_D(const QDeclarativeSmoothedAnimation);
+ return d->anim->velocity;
+}
+
+/*!
+ \qmlproperty real SmoothedAnimation::velocity
+
+ This property holds the average velocity allowed when tracking the 'to' value.
+
+ The default velocity of SmoothedAnimation is 200 units/second.
+
+ Setting this to -1 disables the velocity value.
+*/
+void QDeclarativeSmoothedAnimation::setVelocity(qreal v)
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ if (d->anim->velocity == v)
+ return;
+
+ d->anim->velocity = v;
+ emit velocityChanged();
+}
+
+/*!
+ \qmlproperty int SmoothedAnimation::maximumEasingTime
+
+ This property specifies the maximum time, in msecs, an "eases" during the follow should take.
+ Setting this property causes the velocity to "level out" after at a time. Setting
+ a negative value reverts to the normal mode of easing over the entire animation
+ duration.
+
+ The default value is -1.
+*/
+int QDeclarativeSmoothedAnimation::maximumEasingTime() const
+{
+ Q_D(const QDeclarativeSmoothedAnimation);
+ return d->anim->maximumEasingTime;
+}
+
+void QDeclarativeSmoothedAnimation::setMaximumEasingTime(int v)
+{
+ Q_D(QDeclarativeSmoothedAnimation);
+ d->anim->maximumEasingTime = v;
+ emit maximumEasingTimeChanged();
+}
+
+QT_END_NAMESPACE