@pixi/animate/lib/animate/MovieClip.mjs.map

PIXI plugin for the PixiAnimate Extension

{"version":3,"file":"MovieClip.mjs","sources":["../../src/animate/MovieClip.ts"],"sourcesContent":["import { Timeline } from './Timeline';\nimport { TweenProps, EaseMethod, getEaseFromConfig, KeyframeData } from './Tween';\nimport { utils } from './utils';\nimport { sound } from './sound';\nimport { AnimateContainer } from './Container';\nimport type { AnimateDisplayObject } from './DisplayObject';\nimport { Ticker } from '@pixi/ticker';\nimport { settings } from '@pixi/settings';\nimport type { Graphics } from '@pixi/graphics';\nimport type { Sprite } from '@pixi/sprite';\nimport type { IDestroyOptions } from '@pixi/display';\nconst SharedTicker = Ticker.shared;\n\nexport interface MovieClipOptions\n{\n    /**\n     * The default playback mode is independent (0). Child movieclips are given a different value as subordinate objects.\n     */\n    mode?: number;\n    /**\n     * The starting frame. Default is 0.\n     */\n    startPosition?: number;\n    /**\n     * If playback is looped. Default is true.\n     */\n    loop?: boolean;\n    /**\n     * The frame labels map - label to frames\n     */\n    labels?: LabelMap;\n    /**\n     * The duration of the clip. If no duration is provided, length is automatically determined.\n     */\n    duration?: number;\n    /**\n     * The framerate to use for an independent mode MovieClip. Default is 24.\n     */\n    framerate?: number;\n}\n\nexport interface FrameLabel\n{\n    label: string;\n    position: number;\n}\n\nexport interface LabelMap\n{\n    [label: string]: number;\n}\n\nexport type FrameAction = (this: MovieClip) => void;\n\ntype TimedChildTimeline = boolean[] & {target?: AnimateDisplayObject};\n\n/**\n * Provide timeline playback of movieclip\n */\nexport class MovieClip extends AnimateContainer\n{\n    /**\n     * The MovieClip will advance independently of its parent, even if its parent is paused.\n     * This is the default mode.\n     */\n    public static readonly INDEPENDENT = 0;\n\n    /**\n     * The MovieClip will only display a single frame (as determined by the startPosition property).\n     */\n    public static readonly SINGLE_FRAME = 1;\n\n    /**\n     * The MovieClip will be advanced only when its parent advances and will be synched to the position of\n     * the parent MovieClip.\n     */\n    public static readonly SYNCHED = 2;\n\n    /**\n     * The default framerate if none is specified or there's not parent clip with a framerate.\n     */\n    public static readonly DEFAULT_FRAMERATE = 24;\n\n    /**\n     * Fast way of checking if a movie clip is actually a movie clip.\n     * Prevents circular references and is faster than instanceof.\n     */\n    public isMovieClip = true;\n\n    /**\n     * Controls how this MovieClip advances its time. Must be one of 0 (INDEPENDENT), 1 (SINGLE_FRAME), or 2 (SYNCHED).\n     * See each constant for a description of the behaviour.\n     */\n    public mode: number;\n\n    /**\n     * Specifies what the first frame to play in this movieclip, or the only frame to display if mode is SINGLE_FRAME.\n     */\n    public startPosition: number;\n\n    /**\n     * Indicates whether this MovieClip should loop when it reaches the end of its timeline.\n     */\n    public loop: boolean;\n\n    /**\n     * The current frame of the movieclip.\n     * @readOnly\n     */\n    public currentFrame: number;\n\n    /**\n     * The collection of private labels\n     */\n    private _labels: FrameLabel[];\n\n    /**\n     * The collection of private labels\n     */\n    private _labelDict: LabelMap;\n\n    /**\n     * If true, this movieclip will animate automatically whenever it is on the stage.\n     */\n    public selfAdvance: boolean;\n\n    /**\n     * If true, the MovieClip's position will not advance when ticked.\n     */\n    public paused: boolean;\n\n    /**\n     * If true, actions in this MovieClip's tweens will be run when the playhead advances.\n     */\n    public actionsEnabled: boolean;\n\n    /**\n     * If true, the MovieClip will automatically be reset to its first frame whenever the timeline adds\n     * it back onto the display list. This only applies to MovieClip instances with mode=INDEPENDENT.\n     * <br><br>\n     * For example, if you had a character animation with a 'body' child MovieClip instance\n     * with different costumes on each frame, you could set body.autoReset = false, so that\n     * you can manually change the frame it is on, without worrying that it will be reset\n     * automatically.\n     */\n    public autoReset: boolean;\n\n    /**\n     * Offset from parent frame for a synched movieclip.\n     */\n    private _synchOffset: number;\n\n    /**\n     * Previous position that this movieclip was stopped on.\n     */\n    private _prevPos: number;\n\n    /**\n     * Note - changed from default: When the MovieClip is framerate independent, this is the time\n     * elapsed from frame 0 in seconds.\n     */\n    private _t: number;\n\n    /**\n     * By default MovieClip instances advance one frame per tick. Specifying a framerate for the MovieClip\n     * will cause it to advance based on elapsed time between ticks as appropriate to maintain the target\n     * framerate.\n     */\n    protected _framerate: number;\n\n    /**\n     * The total time in seconds for the animation. This is changed when setting the framerate.\n     */\n    private _duration: number;\n\n    /**\n     * The total duration in frames for the animation.\n     */\n    private _totalFrames: number;\n\n    /**\n     * Standard tween timelines for all objects. Each element in the _timelines array\n     * is a Timeline object - an array of tweens for one target, in order of occurrence.\n     */\n    protected _timelines: Timeline[];\n\n    /**\n     * Array of child timelines denoting if a child is actively a child of this movieclip\n     * on any given frame. Each element in the _timedChildTimelines is an array with a 'target'\n     * property, and is an array of boolean values indexed by frame.\n     * @private\n     */\n    public _timedChildTimelines: TimedChildTimeline[];\n\n    /**\n     * Array to depth sort timed children\n     */\n    protected _depthSorted: AnimateDisplayObject[];\n\n    /**\n     * Array of frame scripts, indexed by frame.\n     */\n    protected _actions: FrameAction[][];\n\n    /**\n     * Optional callback fired before timeline is updated.\n     * Can be used to clamp or update the currentFrame.\n     * @private\n     */\n    public _beforeUpdate: (target: MovieClip) => (() => void | null);\n\n    /**\n     * Internal property used to control child MovieClips relative to parents.\n     */\n    private parentStartPosition: number;\n\n    /**\n     * @param options - The options object\n     */\n    constructor(options?: MovieClipOptions);\n    /**\n     * @param mode - The playback mode default is independent (0),\n     * @param duration - The duration, if no duration is provided, auto determines length\n     * @param loop - If playback is looped\n     * @param framerate - The framerate to use for independent mode\n     * @param labels - The frame labels map of label to frames\n     */\n    constructor(mode?: number, duration?: number, loop?: boolean, framerate?: number, labels?: LabelMap);\n    constructor(\n        options?: MovieClipOptions | number,\n        duration?: number,\n        loop?: boolean,\n        framerate?: number,\n        labels?: LabelMap\n    )\n    {\n        super();\n\n        // Default options\n        options = options === undefined ? {} : options;\n\n        // Options can also be the mode\n        if (typeof options === 'number')\n        {\n            options = {\n                mode: options || MovieClip.INDEPENDENT,\n                duration: duration || 0,\n                loop: loop === undefined ? true : loop,\n                labels: labels || {},\n                framerate: framerate || 0,\n                startPosition: 0,\n            };\n        }\n        else\n        {\n            // Apply defaults to options\n            options = Object.assign({\n                mode: MovieClip.INDEPENDENT,\n                startPosition: 0,\n                loop: true,\n                labels: {},\n                duration: 0,\n                framerate: 0,\n            }, options);\n        }\n\n        this.mode = options.mode;\n        this.startPosition = options.startPosition;\n        this.loop = !!options.loop;\n        this.currentFrame = 0;\n        this._labels = [];\n        this._labelDict = options.labels;\n\n        if (options.labels)\n        {\n            for (const name in options.labels)\n            {\n                const label = {\n                    label: name,\n                    position: options.labels[name],\n                };\n\n                this._labels.push(label);\n            }\n            this._labels.sort((a, b) => a.position - b.position);\n        }\n\n        this.selfAdvance = true;\n        this.paused = false;\n        this.actionsEnabled = true;\n        this.autoReset = true;\n        this._synchOffset = 0;\n        this._prevPos = -1; // TODO: evaluate using a ._reset Boolean prop instead of -1.\n        this._t = 0;\n        this._framerate = options.framerate;\n        this._duration = 0;\n        this._totalFrames = options.duration;\n        this._timelines = [];\n        this._timedChildTimelines = [];\n        this._depthSorted = [];\n        this._actions = [];\n        this._beforeUpdate = null;\n        this.parentStartPosition = 0;\n\n        if (this.mode === MovieClip.INDEPENDENT)\n        {\n            this._tickListener = this._tickListener.bind(this);\n            this._onAdded = this._onAdded.bind(this);\n            this._onRemoved = this._onRemoved.bind(this);\n            this.on('added', this._onAdded);\n            this.on('removed', this._onRemoved);\n        }\n\n        if (options.framerate)\n        {\n            this.framerate = options.framerate;\n        }\n\n        // save often used methods on the instance so that they can be fetched slightly faster\n        // than if they had to be fetched from the prototype\n        /* eslint-disable no-self-assign */\n        this.advance = this.advance;\n        this._updateTimeline = this._updateTimeline;\n        this._setTimelinePosition = this._setTimelinePosition;\n        this._goto = this._goto;\n        /* eslint-enable no-self-assign */\n    }\n\n    private _onAdded(): void\n    {\n        if (!this._framerate)\n        {\n            this.framerate = this.parentFramerate;\n        }\n        SharedTicker.add(this._tickListener, null);\n    }\n\n    private _tickListener(tickerDeltaTime: number): void\n    {\n        if (this.paused || !this.selfAdvance)\n        {\n            // see if the movieclip needs to be updated even though it isn't animating\n            if (this._prevPos < 0)\n            {\n                this._goto(this.currentFrame);\n            }\n\n            return;\n        }\n        const seconds = tickerDeltaTime / settings.TARGET_FPMS / 1000;\n\n        this.advance(seconds);\n    }\n\n    private _onRemoved(): void\n    {\n        SharedTicker.remove(this._tickListener, null);\n    }\n\n    /**\n     * Returns an array of objects with label and position (aka frame) properties, sorted by position.\n     */\n    public get labels(): FrameLabel[]\n    {\n        return this._labels;\n    }\n\n    /**\n     * Returns a dictionary of labels where key is the label and value is the frame.\n     */\n    public get labelsMap(): LabelMap\n    {\n        return this._labelDict;\n    }\n\n    /**\n     * Returns the name of the label on or immediately before the current frame.\n     */\n    public get currentLabel(): string | null\n    {\n        const labels = this._labels;\n        let current: string = null;\n\n        for (let i = 0, len = labels.length; i < len; ++i)\n        {\n            if (labels[i].position <= this.currentFrame)\n            {\n                current = labels[i].label;\n            }\n            else\n            {\n                break;\n            }\n        }\n\n        return current;\n    }\n\n    /**\n     * When the MovieClip is framerate independent, this is the time elapsed from frame 0 in seconds.\n     */\n    public get elapsedTime(): number\n    {\n        return this._t;\n    }\n\n    public set elapsedTime(value)\n    {\n        this._t = value;\n    }\n\n    /**\n     * By default MovieClip instances advance one frame per tick. Specifying a framerate for the\n     * MovieClip will cause it to advance based on elapsed time between ticks as appropriate to\n     * maintain the target framerate.\n     *\n     * For example, if a MovieClip with a framerate of 10 is placed on a Stage being updated at\n     * 40fps, then the MovieClip advance roughly one frame every 4 ticks. This will not be exact,\n     * because the time between each tick vary slightly between frames.\n     *\n     * This feature is dependent on the tick event object (or an object with an appropriate 'delta' property) being\n     * passed into {{#crossLink 'Stage/update'}}{{/crossLink}}.\n     */\n    public get framerate(): number\n    {\n        return this._framerate;\n    }\n    public set framerate(value)\n    {\n        if (value > 0)\n        {\n            if (this._framerate)\n            {\n                // recalculate time based on difference between new and old framerate:\n                this._t *= this._framerate / value;\n            }\n            else\n            {\n                this._t = this.currentFrame / value;\n            }\n            this._framerate = value;\n            this._duration = value ? this._totalFrames / value : 0;\n        }\n        else\n        {\n            this._t = this._framerate = this._duration = 0;\n        }\n    }\n\n    /**\n     * Get the total number of frames (duration) of this MovieClip\n     */\n    public get totalFrames(): number\n    {\n        return this._totalFrames;\n    }\n\n    /**\n     * Extend the timeline to the last frame.\n     */\n    private _autoExtend(endFrame: number): void\n    {\n        if (this._totalFrames < endFrame)\n        {\n            this._totalFrames = endFrame;\n        }\n    }\n\n    /**\n     * Convert values of properties\n     */\n    private _parseProperties(properties: TweenProps & {t?: string | number; v?: number | boolean}): void\n    {\n        // Convert any string colors to uints\n        if (typeof properties.t === 'string')\n        {\n            properties.t = utils.hexToUint(properties.t);\n        }\n        else if (typeof properties.v === 'number')\n        {\n            properties.v = !!properties.v;\n        }\n    }\n\n    /**\n     * Get a timeline for a child, synced timeline.\n     */\n    private _getChildTimeline(instance: AnimateDisplayObject): Timeline\n    {\n        for (let i = this._timelines.length - 1; i >= 0; --i)\n        {\n            if (this._timelines[i].target === instance)\n            {\n                return this._timelines[i];\n            }\n        }\n        const timeline = Timeline.create(instance);\n\n        this._timelines.push(timeline);\n\n        return timeline;\n    }\n\n    /**\n     * Add mask or masks\n     */\n    public addTimedMask(instance: AnimateDisplayObject, keyframes: {[frame: number]: Graphics | Sprite}): this\n    {\n        for (const i in keyframes)\n        {\n            this.addKeyframe(instance, {\n                m: keyframes[i],\n            }, parseInt(i, 10));\n        }\n\n        // Set the initial position/add\n        this._setTimelinePosition(this.currentFrame, this.currentFrame, true);\n\n        return this;\n    }\n\n    /**\n     * Shortcut alias for `addTimedMask`\n     */\n    public am = this.addTimedMask;\n\n    /**\n     * Shortcut alias for `addTween`\n     */\n    public tw = this.addTween;\n\n    /**\n     * Add a tween to the clip\n     * @param instance - The clip to tween\n     * @param properties - The property or property to tween\n     * @param startFrame - The frame to start tweening\n     * @param duration - Number of frames to tween. If 0, then the properties are set with no tweening.\n     * @param ease - An optional easing function that takes the tween time from 0-1.\n     */\n    public addTween(instance: AnimateDisplayObject,\n        properties: TweenProps,\n        startFrame: number,\n        duration?: number,\n        ease?: EaseMethod): this\n    {\n        const timeline = this._getChildTimeline(instance);\n\n        this._parseProperties(properties);\n        timeline.addTween(properties, startFrame, duration, ease);\n        this._autoExtend(startFrame + duration);\n\n        return this;\n    }\n\n    /**\n     * Add a tween to the clip\n     * @param instance - The clip to tween\n     * @param properties - The property or property to tween\n     * @param startFrame - The frame to start tweening\n     */\n    public addKeyframe(instance: AnimateDisplayObject, properties: KeyframeData, startFrame: number): this\n    {\n        const timeline = this._getChildTimeline(instance);\n        const { tw } = properties;\n\n        // remove tw property just so that it doesn't mess anything up or confuse anyone doing debugging\n        delete properties.tw;\n        this._parseProperties(properties);\n        // add keyframe - note that even if we add a tween immediately afterwards, we want to\n        // add this keyframe in order to make sure the starting properties are set\n        timeline.addKeyframe(properties, startFrame);\n        this._autoExtend(startFrame);\n        // Add a tween if present in the keyframe data\n        if (tw)\n        {\n            this.addTween(instance, tw.p, startFrame, tw.d, getEaseFromConfig(tw.e));\n        }\n\n        return this;\n    }\n\n    /**\n     * Alias for method `addTimedChild`\n     */\n    public at = this.addTimedChild;\n\n    /**\n     * Add a child to show for a certain number of frames before automatic removal.\n     * @param instance - The clip to show\n     * @param startFrame - The starting frame\n     * @param duration - The number of frames to display the child before removing it.\n     * @param keyframes - The collection of static keyframes to add\n     */\n    public addTimedChild(instance: AnimateDisplayObject,\n        startFrame: number,\n        duration?: number,\n        keyframes?: string | {[frame: number]: KeyframeData}): this\n    {\n        if (startFrame === undefined) // jshint ignore:line\n        {\n            startFrame = 0;\n        }\n        if (duration === undefined || duration < 1) // jshint ignore:line\n        {\n            duration = this._totalFrames || 1;\n        }\n\n        // Add the starting offset for synced movie clips\n        if (instance instanceof MovieClip && instance.mode === MovieClip.SYNCHED)\n        {\n            (instance as MovieClip).parentStartPosition = startFrame;\n        }\n\n        // add tweening info about this child's presence on stage\n        // when the child is (re)added, if it has 'autoReset' set to true, then it\n        // should be set back to frame 0\n        let timeline: TimedChildTimeline;\n\n        // get existing timeline\n        for (let i = this._timedChildTimelines.length - 1; i >= 0; --i)\n        {\n            if (this._timedChildTimelines[i].target === instance)\n            {\n                timeline = this._timedChildTimelines[i];\n                break;\n            }\n        }\n        // if there wasn't one, make a new one\n        if (!timeline)\n        {\n            timeline = [];\n            timeline.target = instance;\n            this._timedChildTimelines.push(timeline);\n        }\n\n        // Fill the timeline with keyframe booleans\n        utils.fillFrames(timeline, startFrame, duration);\n\n        // Update the total frames if the instance extends our current\n        // total frames for this movieclip\n        if (this._totalFrames < startFrame + duration)\n        {\n            this._totalFrames = startFrame + duration;\n        }\n\n        // Add the collection of keyframes\n        if (keyframes)\n        {\n            if (typeof keyframes === 'string')\n            {\n                keyframes = utils.deserializeKeyframes(keyframes);\n            }\n            let sequenceUsesSkew = false;\n\n            for (const i in keyframes)\n            {\n                if (keyframes[i].kx || keyframes[i].ky)\n                {\n                    sequenceUsesSkew = true;\n                    break;\n                }\n            }\n            if (sequenceUsesSkew)\n            {\n                for (const i in keyframes)\n                {\n                    if (keyframes[i].r !== undefined)\n                    {\n                        keyframes[i].kx = keyframes[i].kx || keyframes[i].r * -1;\n                        keyframes[i].ky = keyframes[i].ky || keyframes[i].r;\n                        delete keyframes[i].r;\n                    }\n                    if (keyframes[i].tw?.p?.r !== undefined)\n                    {\n                        keyframes[i].tw.p.kx = keyframes[i].tw.p.kx || keyframes[i].tw.p.r * -1;\n                        keyframes[i].tw.p.ky = keyframes[i].tw.p.ky || keyframes[i].tw.p.r;\n                        delete keyframes[i].tw.p.r;\n                    }\n                }\n            }\n            for (const i in keyframes)\n            {\n                this.addKeyframe(instance, keyframes[i], parseInt(i, 10));\n            }\n            this._getChildTimeline(instance)\n                // subtract 1 from duration because we are using 0 based frame indices\n                // and duration is calculated as total frames\n                .extendLastFrame(startFrame + duration - 1);\n        }\n\n        // Set the initial position/add\n        this._setTimelinePosition(startFrame, this.currentFrame, true);\n\n        return this;\n    }\n\n    /**\n     * Short cut for `addAction`\n     */\n    public aa = this.addAction;\n\n    /**\n     * Handle frame actions, callback is bound to the instance of the MovieClip.\n     * @param callback - The clip call on a certain frame\n     * @param startFrame - The starting frame index or label\n     */\n    public addAction(callback: FrameAction, startFrame: number | string): this\n    {\n        if (typeof startFrame === 'string')\n        {\n            const index = this._labelDict[startFrame];\n\n            if (index === undefined)\n            {\n                throw new Error(`The label '${startFrame}' does not exist on this timeline`);\n            }\n            startFrame = index;\n        }\n\n        const actions = this._actions;\n\n        // ensure that the movieclip timeline is long enough to support the target frame\n        if (actions.length <= startFrame)\n        {\n            actions.length = startFrame + 1;\n        }\n        if (this._totalFrames < startFrame)\n        {\n            this._totalFrames = startFrame;\n        }\n        // add the action\n        if (actions[startFrame])\n        {\n            actions[startFrame].push(callback);\n        }\n        else\n        {\n            actions[startFrame] = [callback];\n        }\n\n        return this;\n    }\n\n    /**\n     * Short cut for `playSound`\n     */\n    public ps = this.playSound;\n\n    /**\n     * Handle sounds.\n     * @param alias - The name of the Sound\n     * @param loop - The loop property of the sound\n     */\n    public playSound(alias: string, loop?: boolean): this\n    {\n        sound.emit('play', alias, !!loop, this);\n\n        return this;\n    }\n\n    /**\n     * Sets paused to false.\n     */\n    play(): void\n    {\n        this.paused = false;\n    }\n\n    /**\n     * Sets paused to true.\n     */\n    stop(): void\n    {\n        this.paused = true;\n    }\n\n    /**\n     * Advances this movie clip to the specified position or label and sets paused to false.\n     * @param positionOrLabel - The animation name or frame number to go to.\n     */\n    public gotoAndPlay(positionOrLabel: string | number): void\n    {\n        this.paused = false;\n        this._goto(positionOrLabel);\n    }\n\n    /**\n     * Advances this movie clip to the specified position or label and sets paused to true.\n     * @param positionOrLabel - The animation or frame name to go to.\n     */\n    public gotoAndStop(positionOrLabel: string | number): void\n    {\n        this.paused = true;\n        this._goto(positionOrLabel);\n    }\n\n    /**\n     * Get the close parent with a valid framerate. If no parent, returns the default framerate.\n     */\n    public get parentFramerate(): number\n    {\n        // eslint-disable-next-line @typescript-eslint/no-this-alias\n        let o: MovieClip = this;\n        let fps = o._framerate;\n\n        // eslint-disable-next-line no-unmodified-loop-condition\n        while ((o = o.parent as MovieClip) && !fps)\n        {\n            if (o.mode === MovieClip.INDEPENDENT)\n            {\n                fps = o._framerate;\n            }\n        }\n\n        return fps || MovieClip.DEFAULT_FRAMERATE;\n    }\n\n    /**\n     * Advances the playhead. This occurs automatically each tick by default.\n     * @param time - The amount of time in seconds to advance by. Only applicable if framerate is set.\n     */\n    public advance(time?: number): void\n    {\n        // Handle any other cases where starting to play\n        // and no framerate has been set yet\n        if (!this._framerate)\n        {\n            this.framerate = this.parentFramerate;\n        }\n\n        if (time)\n        {\n            this._t += time;\n        }\n        if (this._t > this._duration)\n        {\n            this._t = this.loop ? this._t % this._duration : this._duration;\n        }\n        // add a tiny amount to account for potential floating point errors\n        this.currentFrame = Math.floor((this._t * this._framerate) + 0.00000001);\n        // final error checking\n        if (this.currentFrame >= this._totalFrames)\n        {\n            this.currentFrame = this._totalFrames - 1;\n        }\n        let afterUpdateOnce;\n\n        if (this._beforeUpdate)\n        {\n            afterUpdateOnce = this._beforeUpdate(this);\n        }\n        // update all tweens & actions in the timeline\n        this._updateTimeline();\n\n        // Do the animator callback here\n        if (afterUpdateOnce)\n        {\n            afterUpdateOnce();\n        }\n    }\n\n    /**\n     * @param positionOrLabel - The animation name or frame number to go to.\n     */\n    protected _goto(positionOrLabel: string | number): void\n    {\n        const pos = typeof positionOrLabel === 'string' ? this._labelDict[positionOrLabel] : positionOrLabel;\n\n        if (pos === undefined) // jshint ignore:line\n        {\n            return;\n        }\n        // prevent _updateTimeline from overwriting the new position because of a reset:\n        this._prevPos = NaN;\n        this.currentFrame = pos;\n\n        // Handle the case where trying to play but haven't\n        // added to the stage yet\n        if (!this._framerate)\n        {\n            this.framerate = this.parentFramerate;\n        }\n\n        // update the elapsed time if a time based movieclip\n        if (this._framerate > 0)\n        {\n            this._t = pos / this._framerate;\n        }\n        else\n        {\n            this._t = 0;\n        }\n        this._updateTimeline();\n    }\n\n    /**\n     * Reset the movieclip to the first frame (without advancing the timeline).\n     */\n    private _reset(): void\n    {\n        this._prevPos = -1;\n        this._t = 0;\n        this.currentFrame = 0;\n    }\n\n    /**\n     * Update timeline position according to playback, performing actions and updating children.\n     * @private\n     */\n    public _updateTimeline(): void\n    {\n        const synched = this.mode !== MovieClip.INDEPENDENT;\n\n        if (synched)\n        {\n            this.currentFrame = this.startPosition + (this.mode === MovieClip.SINGLE_FRAME ? 0 : this._synchOffset);\n            if (this.currentFrame >= this._totalFrames)\n            {\n                this.currentFrame %= this._totalFrames;\n            }\n        }\n\n        if (this._prevPos === this.currentFrame)\n        {\n            return;\n        }\n\n        // update timeline position, ignoring actions if this is a graphic.\n        this._setTimelinePosition(this._prevPos, this.currentFrame, synched ? false : this.actionsEnabled);\n\n        this._prevPos = this.currentFrame;\n    }\n\n    /**\n     * Set the timeline position\n     */\n    protected _setTimelinePosition(startFrame: number, currentFrame: number, doActions: boolean): void\n    {\n        if (startFrame !== currentFrame && doActions)\n        {\n            let startPos: number;\n\n            if (isNaN(startFrame))\n            {\n                startPos = currentFrame;\n            }\n            else\n            {\n                startPos = (startFrame >= this._totalFrames - 1 ? 0 : startFrame + 1);\n            }\n            // generate actionFrames on the way\n            const actionFrames: number[] = [];\n\n            // loop\n            if (currentFrame < startPos)\n 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