[844] | 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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| 6 | **
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| 7 | ** This file is part of the QtDeclarative module of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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| 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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| 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at qt-info@nokia.com.
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include "private/qdeclarativespringanimation_p.h"
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| 43 |
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| 44 | #include "private/qdeclarativeanimation_p_p.h"
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| 45 | #include <qdeclarativeproperty_p.h>
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| 46 |
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| 47 | #include <QtCore/qdebug.h>
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| 48 |
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| 49 | #include <private/qobject_p.h>
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| 50 |
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| 51 | #include <limits.h>
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| 52 | #include <math.h>
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| 53 |
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| 54 | QT_BEGIN_NAMESPACE
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| 55 |
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| 56 |
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| 57 | class QDeclarativeSpringAnimationPrivate : public QDeclarativePropertyAnimationPrivate
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| 58 | {
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| 59 | Q_DECLARE_PUBLIC(QDeclarativeSpringAnimation)
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| 60 | public:
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| 61 |
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| 62 |
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| 63 | struct SpringAnimation {
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| 64 | SpringAnimation()
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| 65 | : currentValue(0), to(0), velocity(0), start(0), duration(0) {}
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| 66 | qreal currentValue;
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| 67 | qreal to;
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| 68 | qreal velocity;
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| 69 | int start;
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| 70 | int duration;
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| 71 | };
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| 72 | QHash<QDeclarativeProperty, SpringAnimation> activeAnimations;
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| 73 |
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| 74 | qreal maxVelocity;
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| 75 | qreal velocityms;
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| 76 | int lastTime;
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| 77 | qreal mass;
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| 78 | qreal spring;
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| 79 | qreal damping;
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| 80 | qreal epsilon;
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| 81 | qreal modulus;
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| 82 |
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| 83 | bool useMass : 1;
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| 84 | bool haveModulus : 1;
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| 85 |
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| 86 | enum Mode {
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| 87 | Track,
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| 88 | Velocity,
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| 89 | Spring
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| 90 | };
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| 91 | Mode mode;
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| 92 |
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| 93 | QDeclarativeSpringAnimationPrivate()
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| 94 | : maxVelocity(0), velocityms(0), lastTime(0)
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| 95 | , mass(1.0), spring(0.), damping(0.), epsilon(0.01)
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| 96 | , modulus(0.0), useMass(false), haveModulus(false)
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| 97 | , mode(Track), clock(0)
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| 98 | { }
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| 99 |
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| 100 | void tick(int time);
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| 101 | bool animate(const QDeclarativeProperty &property, SpringAnimation &animation, int elapsed);
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| 102 | void updateMode();
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| 103 |
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| 104 | typedef QTickAnimationProxy<QDeclarativeSpringAnimationPrivate, &QDeclarativeSpringAnimationPrivate::tick> Clock;
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| 105 | Clock *clock;
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| 106 | };
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| 107 |
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| 108 | void QDeclarativeSpringAnimationPrivate::tick(int time)
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| 109 | {
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| 110 | if (mode == Track) {
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| 111 | clock->stop();
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| 112 | return;
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| 113 | }
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| 114 | int elapsed = time - lastTime;
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| 115 | if (!elapsed)
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| 116 | return;
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| 117 |
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| 118 | if (mode == Spring) {
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| 119 | if (elapsed < 16) // capped at 62fps.
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| 120 | return;
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| 121 | int count = elapsed / 16;
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| 122 | lastTime = time - (elapsed - count * 16);
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| 123 | } else {
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| 124 | lastTime = time;
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| 125 | }
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| 126 |
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| 127 | QMutableHashIterator<QDeclarativeProperty, SpringAnimation> it(activeAnimations);
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| 128 | while (it.hasNext()) {
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| 129 | it.next();
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| 130 | if (animate(it.key(), it.value(), elapsed))
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| 131 | it.remove();
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| 132 | }
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| 133 |
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| 134 | if (activeAnimations.isEmpty())
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| 135 | clock->stop();
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| 136 | }
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| 137 |
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| 138 | bool QDeclarativeSpringAnimationPrivate::animate(const QDeclarativeProperty &property, SpringAnimation &animation, int elapsed)
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| 139 | {
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| 140 | qreal srcVal = animation.to;
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| 141 |
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| 142 | bool stop = false;
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| 143 |
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| 144 | if (haveModulus) {
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| 145 | animation.currentValue = fmod(animation.currentValue, modulus);
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| 146 | srcVal = fmod(srcVal, modulus);
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| 147 | }
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| 148 | if (mode == Spring) {
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| 149 | // Real men solve the spring DEs using RK4.
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| 150 | // We'll do something much simpler which gives a result that looks fine.
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| 151 | int count = elapsed / 16;
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| 152 | for (int i = 0; i < count; ++i) {
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| 153 | qreal diff = srcVal - animation.currentValue;
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| 154 | if (haveModulus && qAbs(diff) > modulus / 2) {
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| 155 | if (diff < 0)
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| 156 | diff += modulus;
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| 157 | else
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| 158 | diff -= modulus;
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| 159 | }
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| 160 | if (useMass)
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| 161 | animation.velocity = animation.velocity + (spring * diff - damping * animation.velocity) / mass;
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| 162 | else
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| 163 | animation.velocity = animation.velocity + spring * diff - damping * animation.velocity;
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| 164 | if (maxVelocity > 0.) {
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| 165 | // limit velocity
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| 166 | if (animation.velocity > maxVelocity)
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| 167 | animation.velocity = maxVelocity;
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| 168 | else if (animation.velocity < -maxVelocity)
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| 169 | animation.velocity = -maxVelocity;
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| 170 | }
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| 171 | animation.currentValue += animation.velocity * 16.0 / 1000.0;
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| 172 | if (haveModulus) {
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| 173 | animation.currentValue = fmod(animation.currentValue, modulus);
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| 174 | if (animation.currentValue < 0.0)
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| 175 | animation.currentValue += modulus;
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| 176 | }
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| 177 | }
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| 178 | if (qAbs(animation.velocity) < epsilon && qAbs(srcVal - animation.currentValue) < epsilon) {
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| 179 | animation.velocity = 0.0;
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| 180 | animation.currentValue = srcVal;
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| 181 | stop = true;
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| 182 | }
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| 183 | } else {
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| 184 | qreal moveBy = elapsed * velocityms;
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| 185 | qreal diff = srcVal - animation.currentValue;
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| 186 | if (haveModulus && qAbs(diff) > modulus / 2) {
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| 187 | if (diff < 0)
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| 188 | diff += modulus;
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| 189 | else
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| 190 | diff -= modulus;
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| 191 | }
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| 192 | if (diff > 0) {
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| 193 | animation.currentValue += moveBy;
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| 194 | if (haveModulus)
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| 195 | animation.currentValue = fmod(animation.currentValue, modulus);
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| 196 | } else {
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| 197 | animation.currentValue -= moveBy;
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| 198 | if (haveModulus && animation.currentValue < 0.0)
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| 199 | animation.currentValue = fmod(animation.currentValue, modulus) + modulus;
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| 200 | }
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| 201 | if (lastTime - animation.start >= animation.duration) {
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| 202 | animation.currentValue = animation.to;
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| 203 | stop = true;
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| 204 | }
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| 205 | }
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| 206 |
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| 207 | qreal old_to = animation.to;
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| 208 |
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| 209 | QDeclarativePropertyPrivate::write(property, animation.currentValue,
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| 210 | QDeclarativePropertyPrivate::BypassInterceptor |
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| 211 | QDeclarativePropertyPrivate::DontRemoveBinding);
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| 212 |
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| 213 | return (stop && old_to == animation.to); // do not stop if we got restarted
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| 214 | }
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| 215 |
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| 216 | void QDeclarativeSpringAnimationPrivate::updateMode()
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| 217 | {
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| 218 | if (spring == 0. && maxVelocity == 0.)
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| 219 | mode = Track;
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| 220 | else if (spring > 0.)
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| 221 | mode = Spring;
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| 222 | else {
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| 223 | mode = Velocity;
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| 224 | QHash<QDeclarativeProperty, SpringAnimation>::iterator it;
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| 225 | for (it = activeAnimations.begin(); it != activeAnimations.end(); ++it) {
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| 226 | SpringAnimation &animation = *it;
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| 227 | animation.start = lastTime;
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| 228 | qreal dist = qAbs(animation.currentValue - animation.to);
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| 229 | if (haveModulus && dist > modulus / 2)
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| 230 | dist = modulus - fmod(dist, modulus);
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| 231 | animation.duration = dist / velocityms;
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| 232 | }
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| 233 | }
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| 234 | }
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| 235 |
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| 236 | /*!
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| 237 | \qmlclass SpringAnimation QDeclarativeSpringAnimation
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| 238 | \ingroup qml-animation-transition
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| 239 | \inherits Animation
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| 240 | \since 4.7
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| 241 |
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| 242 | \brief The SpringAnimation element allows a property to track a value in a spring-like motion.
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| 243 |
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| 244 | SpringAnimation mimics the oscillatory behavior of a spring, with the appropriate \l spring constant to
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| 245 | control the acceleration and the \l damping to control how quickly the effect dies away.
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| 246 |
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| 247 | You can also limit the maximum \l velocity of the animation.
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| 248 |
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| 249 | The following \l Rectangle moves to the position of the mouse using a
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| 250 | SpringAnimation when the mouse is clicked. The use of the \l Behavior
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| 251 | on the \c x and \c y values indicates that whenever these values are
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| 252 | changed, a SpringAnimation should be applied.
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| 253 |
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| 254 | \snippet doc/src/snippets/declarative/springanimation.qml 0
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| 255 |
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| 256 | Like any other animation element, a SpringAnimation can be applied in a
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| 257 | number of ways, including transitions, behaviors and property value
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| 258 | sources. The \l {QML Animation} documentation shows a variety of methods
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| 259 | for creating animations.
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| 260 |
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| 261 | \sa SmoothedAnimation, {QML Animation}, {declarative/animation/basics}{Animation basics example}, {declarative/toys/clocks}{Clocks example}
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| 262 | */
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| 263 |
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| 264 | QDeclarativeSpringAnimation::QDeclarativeSpringAnimation(QObject *parent)
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| 265 | : QDeclarativeNumberAnimation(*(new QDeclarativeSpringAnimationPrivate),parent)
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| 266 | {
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| 267 | Q_D(QDeclarativeSpringAnimation);
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| 268 | d->clock = new QDeclarativeSpringAnimationPrivate::Clock(d, this);
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| 269 | }
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| 270 |
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| 271 | QDeclarativeSpringAnimation::~QDeclarativeSpringAnimation()
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| 272 | {
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| 273 | }
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| 274 |
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| 275 | /*!
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| 276 | \qmlproperty real SpringAnimation::velocity
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| 277 |
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| 278 | This property holds the maximum velocity allowed when tracking the source.
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| 279 |
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| 280 | The default value is 0 (no maximum velocity).
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| 281 | */
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| 282 |
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| 283 | qreal QDeclarativeSpringAnimation::velocity() const
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| 284 | {
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| 285 | Q_D(const QDeclarativeSpringAnimation);
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| 286 | return d->maxVelocity;
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| 287 | }
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| 288 |
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| 289 | void QDeclarativeSpringAnimation::setVelocity(qreal velocity)
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| 290 | {
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| 291 | Q_D(QDeclarativeSpringAnimation);
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| 292 | d->maxVelocity = velocity;
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| 293 | d->velocityms = velocity / 1000.0;
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| 294 | d->updateMode();
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| 295 | }
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| 296 |
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| 297 | /*!
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| 298 | \qmlproperty real SpringAnimation::spring
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| 299 |
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| 300 | This property describes how strongly the target is pulled towards the
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| 301 | source. The default value is 0 (that is, the spring-like motion is disabled).
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| 302 |
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| 303 | The useful value range is 0 - 5.0.
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| 304 |
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| 305 | When this property is set and the \l velocity value is greater than 0,
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| 306 | the \l velocity limits the maximum speed.
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| 307 | */
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| 308 | qreal QDeclarativeSpringAnimation::spring() const
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| 309 | {
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| 310 | Q_D(const QDeclarativeSpringAnimation);
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| 311 | return d->spring;
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| 312 | }
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| 313 |
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| 314 | void QDeclarativeSpringAnimation::setSpring(qreal spring)
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| 315 | {
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| 316 | Q_D(QDeclarativeSpringAnimation);
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| 317 | d->spring = spring;
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| 318 | d->updateMode();
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| 319 | }
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| 320 |
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| 321 | /*!
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| 322 | \qmlproperty real SpringAnimation::damping
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| 323 | This property holds the spring damping value.
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| 324 |
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| 325 | This value describes how quickly the spring-like motion comes to rest.
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| 326 | The default value is 0.
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| 327 |
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| 328 | The useful value range is 0 - 1.0. The lower the value, the faster it
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| 329 | comes to rest.
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| 330 | */
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| 331 | qreal QDeclarativeSpringAnimation::damping() const
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| 332 | {
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| 333 | Q_D(const QDeclarativeSpringAnimation);
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| 334 | return d->damping;
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| 335 | }
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| 336 |
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| 337 | void QDeclarativeSpringAnimation::setDamping(qreal damping)
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| 338 | {
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| 339 | Q_D(QDeclarativeSpringAnimation);
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| 340 | if (damping > 1.)
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| 341 | damping = 1.;
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| 342 |
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| 343 | d->damping = damping;
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| 344 | }
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| 345 |
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| 346 |
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| 347 | /*!
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| 348 | \qmlproperty real SpringAnimation::epsilon
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| 349 | This property holds the spring epsilon.
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| 350 |
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| 351 | The epsilon is the rate and amount of change in the value which is close enough
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| 352 | to 0 to be considered equal to zero. This will depend on the usage of the value.
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| 353 | For pixel positions, 0.25 would suffice. For scale, 0.005 will suffice.
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| 354 |
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| 355 | The default is 0.01. Tuning this value can provide small performance improvements.
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| 356 | */
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| 357 | qreal QDeclarativeSpringAnimation::epsilon() const
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| 358 | {
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| 359 | Q_D(const QDeclarativeSpringAnimation);
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| 360 | return d->epsilon;
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| 361 | }
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| 362 |
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| 363 | void QDeclarativeSpringAnimation::setEpsilon(qreal epsilon)
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| 364 | {
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| 365 | Q_D(QDeclarativeSpringAnimation);
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| 366 | d->epsilon = epsilon;
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| 367 | }
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| 368 |
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| 369 | /*!
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| 370 | \qmlproperty real SpringAnimation::modulus
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| 371 | This property holds the modulus value. The default value is 0.
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| 372 |
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| 373 | Setting a \a modulus forces the target value to "wrap around" at the modulus.
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| 374 | For example, setting the modulus to 360 will cause a value of 370 to wrap around to 10.
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| 375 | */
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| 376 | qreal QDeclarativeSpringAnimation::modulus() const
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| 377 | {
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| 378 | Q_D(const QDeclarativeSpringAnimation);
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| 379 | return d->modulus;
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| 380 | }
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| 381 |
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| 382 | void QDeclarativeSpringAnimation::setModulus(qreal modulus)
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| 383 | {
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| 384 | Q_D(QDeclarativeSpringAnimation);
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| 385 | if (d->modulus != modulus) {
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| 386 | d->haveModulus = modulus != 0.0;
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| 387 | d->modulus = modulus;
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| 388 | d->updateMode();
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| 389 | emit modulusChanged();
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| 390 | }
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| 391 | }
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| 392 |
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| 393 | /*!
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| 394 | \qmlproperty real SpringAnimation::mass
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| 395 | This property holds the "mass" of the property being moved.
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| 396 |
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| 397 | The value is 1.0 by default.
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| 398 |
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| 399 | A greater mass causes slower movement and a greater spring-like
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| 400 | motion when an item comes to rest.
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| 401 | */
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| 402 | qreal QDeclarativeSpringAnimation::mass() const
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| 403 | {
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| 404 | Q_D(const QDeclarativeSpringAnimation);
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| 405 | return d->mass;
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| 406 | }
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| 407 |
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| 408 | void QDeclarativeSpringAnimation::setMass(qreal mass)
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| 409 | {
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| 410 | Q_D(QDeclarativeSpringAnimation);
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| 411 | if (d->mass != mass && mass > 0.0) {
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| 412 | d->useMass = mass != 1.0;
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| 413 | d->mass = mass;
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| 414 | emit massChanged();
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| 415 | }
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| 416 | }
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| 417 |
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| 418 | void QDeclarativeSpringAnimation::transition(QDeclarativeStateActions &actions,
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| 419 | QDeclarativeProperties &modified,
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| 420 | TransitionDirection direction)
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| 421 | {
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| 422 | Q_D(QDeclarativeSpringAnimation);
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| 423 | Q_UNUSED(direction);
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| 424 |
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| 425 | if (d->clock->state() != QAbstractAnimation::Running) {
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| 426 | d->lastTime = 0;
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| 427 | }
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| 428 |
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| 429 | QDeclarativeNumberAnimation::transition(actions, modified, direction);
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| 430 |
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| 431 | if (!d->actions)
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| 432 | return;
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| 433 |
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| 434 | if (!d->actions->isEmpty()) {
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| 435 | for (int i = 0; i < d->actions->size(); ++i) {
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| 436 | const QDeclarativeProperty &property = d->actions->at(i).property;
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| 437 | QDeclarativeSpringAnimationPrivate::SpringAnimation &animation
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| 438 | = d->activeAnimations[property];
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| 439 | animation.to = d->actions->at(i).toValue.toReal();
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| 440 | animation.start = d->lastTime;
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| 441 | if (d->fromIsDefined)
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| 442 | animation.currentValue = d->actions->at(i).fromValue.toReal();
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| 443 | else
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| 444 | animation.currentValue = property.read().toReal();
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| 445 | if (d->mode == QDeclarativeSpringAnimationPrivate::Velocity) {
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| 446 | qreal dist = qAbs(animation.currentValue - animation.to);
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| 447 | if (d->haveModulus && dist > d->modulus / 2)
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| 448 | dist = d->modulus - fmod(dist, d->modulus);
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| 449 | animation.duration = dist / d->velocityms;
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| 450 | }
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| 451 | }
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| 452 | }
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| 453 | }
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| 454 |
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| 455 |
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| 456 | QAbstractAnimation *QDeclarativeSpringAnimation::qtAnimation()
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| 457 | {
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| 458 | Q_D(QDeclarativeSpringAnimation);
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| 459 | return d->clock;
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| 460 | }
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| 461 |
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| 462 | QT_END_NAMESPACE
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