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Diffstat (limited to 'web/build/animation.js')
| -rw-r--r-- | web/build/animation.js | 907 |
1 files changed, 907 insertions, 0 deletions
diff --git a/web/build/animation.js b/web/build/animation.js new file mode 100644 index 000000000..05c92eede --- /dev/null +++ b/web/build/animation.js @@ -0,0 +1,907 @@ +/*
+Copyright (c) 2006 Yahoo! Inc. All rights reserved.
+version 0.9.0
+*/
+
+/**
+ *
+ * Base class for animated DOM objects.
+ * @class Base animation class that provides the interface for building animated effects.
+ * <p>Usage: var myAnim = new YAHOO.util.Anim(el, { width: { from: 10, to: 100 } }, 1, YAHOO.util.Easing.easeOut);</p>
+ * @requires YAHOO.util.AnimMgr
+ * @requires YAHOO.util.Easing
+ * @requires YAHOO.util.Dom
+ * @requires YAHOO.util.Event
+ * @constructor
+ * @param {HTMLElement | String} el Reference to the element that will be animated
+ * @param {Object} attributes The attribute(s) to be animated.
+ * Each attribute is an object with at minimum a "to" or "by" member defined.
+ * Additional optional members are "from" (defaults to current value), "units" (defaults to "px").
+ * All attribute names use camelCase.
+ * @param {Number} duration (optional, defaults to 1 second) Length of animation (frames or seconds), defaults to time-based
+ * @param {Function} method (optional, defaults to YAHOO.util.Easing.easeNone) Computes the values that are applied to the attributes per frame (generally a YAHOO.util.Easing method)
+ */
+
+YAHOO.util.Anim = function(el, attributes, duration, method)
+{
+ if (el) {
+ this.init(el, attributes, duration, method);
+ }
+};
+
+YAHOO.util.Anim.prototype = {
+ /**
+ * Returns the value computed by the animation's "method".
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} start The value this attribute should start from for this animation.
+ * @param {Number} end The value this attribute should end at for this animation.
+ * @return {Number} The Value to be applied to the attribute.
+ */
+ doMethod: function(attribute, start, end) {
+ return this.method(this.currentFrame, start, end - start, this.totalFrames);
+ },
+
+ /**
+ * Applies a value to an attribute
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} val The value to be applied to the attribute.
+ * @param {String} unit The unit ('px', '%', etc.) of the value.
+ */
+ setAttribute: function(attribute, val, unit) {
+ YAHOO.util.Dom.setStyle(this.getEl(), attribute, val + unit);
+ },
+
+ /**
+ * Returns current value of the attribute.
+ * @param {String} attribute The name of the attribute.
+ * @return {Number} val The current value of the attribute.
+ */
+ getAttribute: function(attribute) {
+ return parseFloat( YAHOO.util.Dom.getStyle(this.getEl(), attribute));
+ },
+
+ /**
+ * Per attribute units that should be used by default.
+ * @type {Object}
+ */
+ defaultUnits: {
+ opacity: ' '
+ },
+
+ /**
+ * The default unit to use for all attributes if not defined per attribute.
+ * @type {String}
+ */
+ defaultUnit: 'px',
+
+ /**
+ * @param {HTMLElement | String} el Reference to the element that will be animated
+ * @param {Object} attributes The attribute(s) to be animated.
+ * Each attribute is an object with at minimum a "to" or "by" member defined.
+ * Additional optional members are "from" (defaults to current value), "units" (defaults to "px").
+ * All attribute names use camelCase.
+ * @param {Number} duration (optional, defaults to 1 second) Length of animation (frames or seconds), defaults to time-based
+ * @param {Function} method (optional, defaults to YAHOO.util.Easing.easeNone) Computes the values that are applied to the attributes per frame (generally a YAHOO.util.Easing method)
+ */
+ init: function(el, attributes, duration, method) {
+
+ /**
+ * Whether or not the animation is running.
+ * @private
+ * @type {Boolen}
+ */
+ var isAnimated = false;
+
+ /**
+ * A Date object that is created when the animation begins.
+ * @private
+ * @type {Date}
+ */
+ var startTime = null;
+
+ /**
+ * A Date object that is created when the animation ends.
+ * @private
+ * @type {Date}
+ */
+ var endTime = null;
+
+ /**
+ * The number of frames this animation was able to execute.
+ * @private
+ * @type {Int}
+ */
+ var actualFrames = 0;
+
+ /**
+ * The attribute values that will be used if no "from" is supplied.
+ * @private
+ * @type {Object}
+ */
+ var defaultValues = {};
+
+ /**
+ * The element to be animated.
+ * @private
+ * @type {HTMLElement}
+ */
+ el = YAHOO.util.Dom.get(el);
+
+ /**
+ * The collection of attributes to be animated.
+ * Each attribute must have at least a "to" or "by" defined in order to animate.
+ * If "to" is supplied, the animation will end with the attribute at that value.
+ * If "by" is supplied, the animation will end at that value plus its starting value.
+ * If both are supplied, "to" is used, and "by" is ignored.
+ * Optional additional member include "from" (the value the attribute should start animating from, defaults to current value), and "unit" (the units to apply to the values).
+ * @type {Object}
+ */
+ this.attributes = attributes || {};
+
+ /**
+ * The length of the animation. Defaults to "1" (second).
+ * @type {Number}
+ */
+ this.duration = duration || 1;
+
+ /**
+ * The method that will provide values to the attribute(s) during the animation.
+ * Defaults to "YAHOO.util.Easing.easeNone".
+ * @type {Function}
+ */
+ this.method = method || YAHOO.util.Easing.easeNone;
+
+ /**
+ * Whether or not the duration should be treated as seconds.
+ * Defaults to true.
+ * @type {Boolean}
+ */
+ this.useSeconds = true; // default to seconds
+
+ /**
+ * The location of the current animation on the timeline.
+ * In time-based animations, this is used by AnimMgr to ensure the animation finishes on time.
+ * @type {Int}
+ */
+ this.currentFrame = 0;
+
+ /**
+ * The total number of frames to be executed.
+ * In time-based animations, this is used by AnimMgr to ensure the animation finishes on time.
+ * @type {Int}
+ */
+ this.totalFrames = YAHOO.util.AnimMgr.fps;
+
+
+ /**
+ * Returns a reference to the animated element.
+ * @return {HTMLElement}
+ */
+ this.getEl = function() { return el; };
+
+
+ /**
+ * Sets the default value to be used when "from" is not supplied.
+ * @param {String} attribute The attribute being set.
+ * @param {Number} val The default value to be applied to the attribute.
+ */
+ this.setDefault = function(attribute, val) {
+ if ( val == 'auto' ) { // if 'auto' set defaults for well known attributes, zero for others
+ switch(attribute) {
+ case'width':
+ val = el.clientWidth || el.offsetWidth; // computed width
+ break;
+ case 'height':
+ val = el.clientHeight || el.offsetHeight; // computed height
+ break;
+ case 'left':
+ if (YAHOO.util.Dom.getStyle(el, 'position') == 'absolute') {
+ val = el.offsetLeft; // computed left
+ } else {
+ val = 0;
+ }
+ break;
+ case 'top':
+ if (YAHOO.util.Dom.getStyle(el, 'position') == 'absolute') {
+ val = el.offsetTop; // computed top
+ } else {
+ val = 0;
+ }
+ break;
+ default:
+ val = 0;
+ }
+ }
+
+ defaultValues[attribute] = val;
+ }
+
+ /**
+ * Returns the default value for the given attribute.
+ * @param {String} attribute The attribute whose value will be returned.
+ */
+ this.getDefault = function(attribute) {
+ return defaultValues[attribute];
+ };
+
+ /**
+ * Checks whether the element is currently animated.
+ * @return {Boolean} current value of isAnimated.
+ */
+ this.isAnimated = function() {
+ return isAnimated;
+ };
+
+ /**
+ * Returns the animation start time.
+ * @return {Date} current value of startTime.
+ */
+ this.getStartTime = function() {
+ return startTime;
+ };
+
+ /**
+ * Starts the animation by registering it with the animation manager.
+ */
+ this.animate = function() {
+ this.onStart.fire();
+ this._onStart.fire();
+
+ this.totalFrames = ( this.useSeconds ) ? Math.ceil(YAHOO.util.AnimMgr.fps * this.duration) : this.duration;
+ YAHOO.util.AnimMgr.registerElement(this);
+
+ // get starting values or use defaults
+ var attributes = this.attributes;
+ var el = this.getEl();
+ var val;
+
+ for (var attribute in attributes) {
+ val = this.getAttribute(attribute);
+ this.setDefault(attribute, val);
+ }
+
+ isAnimated = true;
+ actualFrames = 0;
+ startTime = new Date();
+ };
+
+ /**
+ * Stops the animation. Normally called by AnimMgr when animation completes.
+ */
+ this.stop = function() {
+ this.currentFrame = 0;
+
+ endTime = new Date();
+
+ var data = {
+ time: endTime,
+ duration: endTime - startTime,
+ frames: actualFrames,
+ fps: actualFrames / this.duration
+ };
+
+ isAnimated = false;
+ actualFrames = 0;
+
+ this.onComplete.fire(data);
+ };
+
+ /**
+ * Feeds the starting and ending values for each animated attribute to doMethod once per frame, then applies the resulting value to the attribute(s).
+ * @private
+ */
+ var onTween = function() {
+ var start;
+ var end = null;
+ var val;
+ var unit;
+ var attributes = this['attributes'];
+
+ for (var attribute in attributes) {
+ unit = attributes[attribute]['unit'] || this.defaultUnits[attribute] || this.defaultUnit;
+
+ if (typeof attributes[attribute]['from'] != 'undefined') {
+ start = attributes[attribute]['from'];
+ } else {
+ start = this.getDefault(attribute);
+ }
+
+ // To beats by, per SMIL 2.1 spec
+ if (typeof attributes[attribute]['to'] != 'undefined') {
+ end = attributes[attribute]['to'];
+ } else if (typeof attributes[attribute]['by'] != 'undefined') {
+ end = start + attributes[attribute]['by'];
+ }
+
+ // if end is null, dont change value
+ if (end !== null && typeof end != 'undefined') {
+
+ val = this.doMethod(attribute, start, end);
+
+ // negative not allowed for these (others too, but these are most common)
+ if ( (attribute == 'width' || attribute == 'height' || attribute == 'opacity') && val < 0 ) {
+ val = 0;
+ }
+
+ this.setAttribute(attribute, val, unit);
+ }
+ }
+
+ actualFrames += 1;
+ };
+
+ /**
+ * Custom event that fires after onStart, useful in subclassing
+ * @private
+ */
+ this._onStart = new YAHOO.util.CustomEvent('_onStart', this);
+
+ /**
+ * Custom event that fires when animation begins
+ * Listen via subscribe method
+ */
+ this.onStart = new YAHOO.util.CustomEvent('start', this);
+
+ /**
+ * Custom event that fires between each frame
+ * Listen via subscribe method
+ */
+ this.onTween = new YAHOO.util.CustomEvent('tween', this);
+
+ /**
+ * Custom event that fires after onTween
+ * @private
+ */
+ this._onTween = new YAHOO.util.CustomEvent('_tween', this);
+
+ /**
+ * Custom event that fires when animation ends
+ * Listen via subscribe method
+ */
+ this.onComplete = new YAHOO.util.CustomEvent('complete', this);
+
+ this._onTween.subscribe(onTween);
+ }
+};
+
+/**
+ * @class Handles animation queueing and threading.
+ * Used by Anim and subclasses.
+ */
+YAHOO.util.AnimMgr = new function() {
+ /**
+ * Reference to the animation Interval
+ * @private
+ * @type Int
+ */
+ var thread = null;
+
+ /**
+ * The current queue of registered animation objects.
+ * @private
+ * @type Array
+ */
+ var queue = [];
+
+ /**
+ * The number of active animations.
+ * @private
+ * @type Int
+ */
+ var tweenCount = 0;
+
+ /**
+ * Base frame rate (frames per second).
+ * Arbitrarily high for better x-browser calibration (slower browsers drop more frames).
+ * @type Int
+ *
+ */
+ this.fps = 200;
+
+ /**
+ * Interval delay in milliseconds, defaults to fastest possible.
+ * @type Int
+ *
+ */
+ this.delay = 1;
+
+ /**
+ * Adds an animation instance to the animation queue.
+ * All animation instances must be registered in order to animate.
+ * @param {object} tween The Anim instance to be be registered
+ */
+ this.registerElement = function(tween) {
+ if ( tween.isAnimated() ) { return false; }// but not if already animating
+
+ queue[queue.length] = tween;
+ tweenCount += 1;
+
+ this.start();
+ };
+
+ /**
+ * Starts the animation thread.
+ * Only one thread can run at a time.
+ */
+ this.start = function() {
+ if (thread === null) { thread = setInterval(this.run, this.delay); }
+ };
+
+ /**
+ * Stops the animation thread or a specific animation instance.
+ * @param {object} tween A specific Anim instance to stop (optional)
+ * If no instance given, Manager stops thread and all animations.
+ */
+ this.stop = function(tween) {
+ if (!tween)
+ {
+ clearInterval(thread);
+ for (var i = 0, len = queue.length; i < len; ++i) {
+ if (queue[i].isAnimated()) {
+ queue[i].stop();
+ }
+ }
+ queue = [];
+ thread = null;
+ tweenCount = 0;
+ }
+ else {
+ tween.stop();
+ tweenCount -= 1;
+
+ if (tweenCount <= 0) { this.stop(); }
+ }
+ };
+
+ /**
+ * Called per Interval to handle each animation frame.
+ */
+ this.run = function() {
+ for (var i = 0, len = queue.length; i < len; ++i) {
+ var tween = queue[i];
+ if ( !tween || !tween.isAnimated() ) { continue; }
+
+ if (tween.currentFrame < tween.totalFrames || tween.totalFrames === null)
+ {
+ tween.currentFrame += 1;
+
+ if (tween.useSeconds) {
+ correctFrame(tween);
+ }
+
+ tween.onTween.fire();
+ tween._onTween.fire();
+ }
+ else { YAHOO.util.AnimMgr.stop(tween); }
+ }
+ };
+
+ /**
+ * On the fly frame correction to keep animation on time.
+ * @private
+ * @param {Object} tween The Anim instance being corrected.
+ */
+ var correctFrame = function(tween) {
+ var frames = tween.totalFrames;
+ var frame = tween.currentFrame;
+ var expected = (tween.currentFrame * tween.duration * 1000 / tween.totalFrames);
+ var elapsed = (new Date() - tween.getStartTime());
+ var tweak = 0;
+
+ if (elapsed < tween.duration * 1000) { // check if falling behind
+ tweak = Math.round((elapsed / expected - 1) * tween.currentFrame);
+ } else { // went over duration, so jump to end
+ tweak = frames - (frame + 1);
+ }
+ if (tweak > 0 && isFinite(tweak)) { // adjust if needed
+ if (tween.currentFrame + tweak >= frames) {// dont go past last frame
+ tweak = frames - (frame + 1);
+ }
+
+ tween.currentFrame += tweak;
+ }
+ };
+}
+
+/**
+ *
+ * @class Used to calculate Bezier splines for any number of control points.
+ *
+ */
+YAHOO.util.Bezier = new function()
+{
+ /**
+ * Get the current position of the animated element based on t.
+ * @param {array} points An array containing Bezier points.
+ * Each point is an array of "x" and "y" values (0 = x, 1 = y)
+ * At least 2 points are required (start and end).
+ * First point is start. Last point is end.
+ * Additional control points are optional.
+ * @param {float} t Basis for determining current position (0 < t < 1)
+ * @return {object} An object containing int x and y member data
+ */
+ this.getPosition = function(points, t)
+ {
+ var n = points.length;
+ var tmp = [];
+
+ for (var i = 0; i < n; ++i){
+ tmp[i] = [points[i][0], points[i][1]]; // save input
+ }
+
+ for (var j = 1; j < n; ++j) {
+ for (i = 0; i < n - j; ++i) {
+ tmp[i][0] = (1 - t) * tmp[i][0] + t * tmp[parseInt(i + 1, 10)][0];
+ tmp[i][1] = (1 - t) * tmp[i][1] + t * tmp[parseInt(i + 1, 10)][1];
+ }
+ }
+
+ return [ tmp[0][0], tmp[0][1] ];
+
+ };
+};
+
+/**
+ * @class Class for defining the acceleration rate and path of animations.
+ */
+YAHOO.util.Easing = new function() {
+
+ /**
+ * Uniform speed between points.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.easeNone = function(t, b, c, d) {
+ return b+c*(t/=d);
+ };
+
+ /**
+ * Begins slowly and accelerates towards end.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.easeIn = function(t, b, c, d) {
+ return b+c*((t/=d)*t*t);
+ };
+
+ /**
+ * Begins quickly and decelerates towards end.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.easeOut = function(t, b, c, d) {
+ var ts=(t/=d)*t;
+ var tc=ts*t;
+ return b+c*(tc + -3*ts + 3*t);
+ };
+
+ /**
+ * Begins slowly and decelerates towards end.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.easeBoth = function(t, b, c, d) {
+ var ts=(t/=d)*t;
+ var tc=ts*t;
+ return b+c*(-2*tc + 3*ts);
+ };
+
+ /**
+ * Begins by going below staring value.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.backIn = function(t, b, c, d) {
+ var ts=(t/=d)*t;
+ var tc=ts*t;
+ return b+c*(-3.4005*tc*ts + 10.2*ts*ts + -6.2*tc + 0.4*ts);
+ };
+
+ /**
+ * End by going beyond ending value.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.backOut = function(t, b, c, d) {
+ var ts=(t/=d)*t;
+ var tc=ts*t;
+ return b+c*(8.292*tc*ts + -21.88*ts*ts + 22.08*tc + -12.69*ts + 5.1975*t);
+ };
+
+ /**
+ * Starts by going below staring value, and ends by going beyond ending value.
+ * @param {Number} t Time value used to compute current value.
+ * @param {Number} b Starting value.
+ * @param {Number} c Delta between start and end values.
+ * @param {Number} d Total length of animation.
+ * @return {Number} The computed value for the current animation frame.
+ */
+ this.backBoth = function(t, b, c, d) {
+ var ts=(t/=d)*t;
+ var tc=ts*t;
+ return b+c*(0.402*tc*ts + -2.1525*ts*ts + -3.2*tc + 8*ts + -2.05*t);
+ };
+};
+
+/**
+ * @class Anim subclass for moving elements along a path defined by the "points" member of "attributes". All "points" are arrays with x, y coordinates.
+ * <p>Usage: <code>var myAnim = new YAHOO.util.Motion(el, { points: { to: [800, 800] } }, 1, YAHOO.util.Easing.easeOut);</code></p>
+ * @requires YAHOO.util.Anim
+ * @requires YAHOO.util.AnimMgr
+ * @requires YAHOO.util.Easing
+ * @requires YAHOO.util.Bezier
+ * @requires YAHOO.util.Dom
+ * @requires YAHOO.util.Event
+ * @constructor
+ * @param {HTMLElement | String} el Reference to the element that will be animated
+ * @param {Object} attributes The attribute(s) to be animated.
+ * Each attribute is an object with at minimum a "to" or "by" member defined.
+ * Additional optional members are "from" (defaults to current value), "units" (defaults to "px").
+ * All attribute names use camelCase.
+ * @param {Number} duration (optional, defaults to 1 second) Length of animation (frames or seconds), defaults to time-based
+ * @param {Function} method (optional, defaults to YAHOO.util.Easing.easeNone) Computes the values that are applied to the attributes per frame (generally a YAHOO.util.Easing method)
+ */
+YAHOO.util.Motion = function(el, attributes, duration, method) {
+ if (el) {
+ this.initMotion(el, attributes, duration, method);
+ }
+};
+
+YAHOO.util.Motion.prototype = new YAHOO.util.Anim();
+
+/**
+ * Per attribute units that should be used by default.
+ * Motion points default to 'px' units.
+ * @type Object
+ */
+YAHOO.util.Motion.prototype.defaultUnits.points = 'px';
+
+/**
+ * Returns the value computed by the animation's "method".
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} start The value this attribute should start from for this animation.
+ * @param {Number} end The value this attribute should end at for this animation.
+ * @return {Number} The Value to be applied to the attribute.
+ */
+YAHOO.util.Motion.prototype.doMethod = function(attribute, start, end) {
+ var val = null;
+
+ if (attribute == 'points') {
+ var translatedPoints = this.getTranslatedPoints();
+ var t = this.method(this.currentFrame, 0, 100, this.totalFrames) / 100;
+
+ if (translatedPoints) {
+ val = YAHOO.util.Bezier.getPosition(translatedPoints, t);
+ }
+
+ } else {
+ val = this.method(this.currentFrame, start, end - start, this.totalFrames);
+ }
+
+ return val;
+};
+
+/**
+ * Returns current value of the attribute.
+ * @param {String} attribute The name of the attribute.
+ * @return {Number} val The current value of the attribute.
+ */
+YAHOO.util.Motion.prototype.getAttribute = function(attribute) {
+ var val = null;
+
+ if (attribute == 'points') {
+ val = [ this.getAttribute('left'), this.getAttribute('top') ];
+ if ( isNaN(val[0]) ) { val[0] = 0; }
+ if ( isNaN(val[1]) ) { val[1] = 0; }
+ } else {
+ val = parseFloat( YAHOO.util.Dom.getStyle(this.getEl(), attribute) );
+ }
+
+ return val;
+};
+
+/**
+ * Applies a value to an attribute
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} val The value to be applied to the attribute.
+ * @param {String} unit The unit ('px', '%', etc.) of the value.
+ */
+YAHOO.util.Motion.prototype.setAttribute = function(attribute, val, unit) {
+ if (attribute == 'points') {
+ YAHOO.util.Dom.setStyle(this.getEl(), 'left', val[0] + unit);
+ YAHOO.util.Dom.setStyle(this.getEl(), 'top', val[1] + unit);
+ } else {
+ YAHOO.util.Dom.setStyle(this.getEl(), attribute, val + unit);
+ }
+};
+
+/**
+ * @param {HTMLElement | String} el Reference to the element that will be animated
+ * @param {Object} attributes The attribute(s) to be animated.
+ * Each attribute is an object with at minimum a "to" or "by" member defined.
+ * Additional optional members are "from" (defaults to current value), "units" (defaults to "px").
+ * All attribute names use camelCase.
+ * @param {Number} duration (optional, defaults to 1 second) Length of animation (frames or seconds), defaults to time-based
+ * @param {Function} method (optional, defaults to YAHOO.util.Easing.easeNone) Computes the values that are applied to the attributes per frame (generally a YAHOO.util.Easing method)
+ */
+YAHOO.util.Motion.prototype.initMotion = function(el, attributes, duration, method) {
+ YAHOO.util.Anim.call(this, el, attributes, duration, method);
+
+ attributes = attributes || {};
+ attributes.points = attributes.points || {};
+ attributes.points.control = attributes.points.control || [];
+
+ this.attributes = attributes;
+
+ var start;
+ var end = null;
+ var translatedPoints = null;
+
+ this.getTranslatedPoints = function() { return translatedPoints; };
+
+ var translateValues = function(val, self) {
+ var pageXY = YAHOO.util.Dom.getXY(self.getEl());
+ val = [ val[0] - pageXY[0] + start[0], val[1] - pageXY[1] + start[1] ];
+
+ return val;
+ };
+
+ var onStart = function() {
+ start = this.getAttribute('points');
+ var attributes = this.attributes;
+ var control = attributes['points']['control'] || [];
+
+ if (control.length > 0 && control[0].constructor != Array) { // could be single point or array of points
+ control = [control];
+ }
+
+ if (YAHOO.util.Dom.getStyle(this.getEl(), 'position') == 'static') { // default to relative
+ YAHOO.util.Dom.setStyle(this.getEl(), 'position', 'relative');
+ }
+
+ if (typeof attributes['points']['from'] != 'undefined') {
+ YAHOO.util.Dom.setXY(this.getEl(), attributes['points']['from']); // set to from point
+ start = this.getAttribute('points'); // get actual offset values
+ }
+ else if ((start[0] === 0 || start[1] === 0)) { // these sometimes up when auto
+ YAHOO.util.Dom.setXY(this.getEl(), YAHOO.util.Dom.getXY(this.getEl())); // set it to current position, giving offsets
+ start = this.getAttribute('points'); // get actual offset values
+ }
+
+ var i, len;
+ // TO beats BY, per SMIL 2.1 spec
+ if (typeof attributes['points']['to'] != 'undefined') {
+ end = translateValues(attributes['points']['to'], this);
+
+ for (i = 0, len = control.length; i < len; ++i) {
+ control[i] = translateValues(control[i], this);
+ }
+
+ } else if (typeof attributes['points']['by'] != 'undefined') {
+ end = [ start[0] + attributes['points']['by'][0], start[1] + attributes['points']['by'][1]];
+
+ for (i = 0, len = control.length; i < len; ++i) {
+ control[i] = [ start[0] + control[i][0], start[1] + control[i][1] ];
+ }
+ }
+
+ if (end) {
+ translatedPoints = [start];
+
+ if (control.length > 0) { translatedPoints = translatedPoints.concat(control); }
+
+ translatedPoints[translatedPoints.length] = end;
+ }
+ };
+
+ this._onStart.subscribe(onStart);
+};
+
+/**
+ * @class Anim subclass for scrolling elements to a position defined by the "scroll" member of "attributes". All "scroll" members are arrays with x, y scroll positions.
+ * <p>Usage: <code>var myAnim = new YAHOO.util.Scroll(el, { scroll: { to: [0, 800] } }, 1, YAHOO.util.Easing.easeOut);</code></p>
+ * @requires YAHOO.util.Anim
+ * @requires YAHOO.util.AnimMgr
+ * @requires YAHOO.util.Easing
+ * @requires YAHOO.util.Bezier
+ * @requires YAHOO.util.Dom
+ * @requires YAHOO.util.Event
+ * @constructor
+ * @param {HTMLElement | String} el Reference to the element that will be animated
+ * @param {Object} attributes The attribute(s) to be animated.
+ * Each attribute is an object with at minimum a "to" or "by" member defined.
+ * Additional optional members are "from" (defaults to current value), "units" (defaults to "px").
+ * All attribute names use camelCase.
+ * @param {Number} duration (optional, defaults to 1 second) Length of animation (frames or seconds), defaults to time-based
+ * @param {Function} method (optional, defaults to YAHOO.util.Easing.easeNone) Computes the values that are applied to the attributes per frame (generally a YAHOO.util.Easing method)
+ */
+YAHOO.util.Scroll = function(el, attributes, duration, method) {
+ if (el) {
+ YAHOO.util.Anim.call(this, el, attributes, duration, method);
+ }
+};
+
+YAHOO.util.Scroll.prototype = new YAHOO.util.Anim();
+
+/**
+ * Per attribute units that should be used by default.
+ * Scroll positions default to no units.
+ * @type Object
+ */
+YAHOO.util.Scroll.prototype.defaultUnits.scroll = ' ';
+
+/**
+ * Returns the value computed by the animation's "method".
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} start The value this attribute should start from for this animation.
+ * @param {Number} end The value this attribute should end at for this animation.
+ * @return {Number} The Value to be applied to the attribute.
+ */
+YAHOO.util.Scroll.prototype.doMethod = function(attribute, start, end) {
+ var val = null;
+
+ if (attribute == 'scroll') {
+ val = [
+ this.method(this.currentFrame, start[0], end[0] - start[0], this.totalFrames),
+ this.method(this.currentFrame, start[1], end[1] - start[1], this.totalFrames)
+ ];
+
+ } else {
+ val = this.method(this.currentFrame, start, end - start, this.totalFrames);
+ }
+ return val;
+}
+
+/**
+ * Returns current value of the attribute.
+ * @param {String} attribute The name of the attribute.
+ * @return {Number} val The current value of the attribute.
+ */
+YAHOO.util.Scroll.prototype.getAttribute = function(attribute) {
+ var val = null;
+ var el = this.getEl();
+
+ if (attribute == 'scroll') {
+ val = [ el.scrollLeft, el.scrollTop ];
+ } else {
+ val = parseFloat( YAHOO.util.Dom.getStyle(el, attribute) );
+ }
+
+ return val;
+};
+
+/**
+ * Applies a value to an attribute
+ * @param {String} attribute The name of the attribute.
+ * @param {Number} val The value to be applied to the attribute.
+ * @param {String} unit The unit ('px', '%', etc.) of the value.
+ */
+YAHOO.util.Scroll.prototype.setAttribute = function(attribute, val, unit) {
+ var el = this.getEl();
+
+ if (attribute == 'scroll') {
+ el.scrollLeft = val[0];
+ el.scrollTop = val[1];
+ } else {
+ YAHOO.util.Dom.setStyle(el, attribute, val + unit);
+ }
+};
+
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