CCActionManager.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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require('../core/platform/CCClass');
var js = require('../core/platform/js');

/*
 * @class HashElement
 * @constructor
 * @private
 */
var HashElement = function () {
    this.actions = [];
    this.target = null; //ccobject
    this.actionIndex = 0;
    this.currentAction = null; //CCAction
    this.paused = false;
    this.lock = false;
};

/**
 * !#en
 * cc.ActionManager is a class that can manage actions.<br/>
 * Normally you won't need to use this class directly. 99% of the cases you will use the CCNode interface,
 * which uses this class's singleton object.
 * But there are some cases where you might need to use this class. <br/>
 * Examples:<br/>
 * - When you want to run an action where the target is different from a CCNode.<br/>
 * - When you want to pause / resume the actions<br/>
 * !#zh
 * cc.ActionManager 是可以管理动作的单例类。<br/>
 * 通常你并不需要直接使用这个类，99%的情况您将使用 CCNode 的接口。<br/>
 * 但也有一些情况下，您可能需要使用这个类。 <br/>
 * 例如：
 *  - 当你想要运行一个动作，但目标不是 CCNode 类型时。 <br/>
 *  - 当你想要暂停/恢复动作时。 <br/>
 * @class ActionManager
 * @example {@link cocos2d/core/CCActionManager/ActionManager.js}
 */
cc.ActionManager = function () {
    this._hashTargets = js.createMap(true);
    this._arrayTargets = [];
    this._currentTarget = null;
    cc.director._scheduler && cc.director._scheduler.enableForTarget(this);
};
cc.ActionManager.prototype = {
    constructor: cc.ActionManager,
    _elementPool: [],

    _searchElementByTarget:function (arr, target) {
        for (var k = 0; k < arr.length; k++) {
            if (target === arr[k].target)
                return arr[k];
        }
        return null;
    },

    _getElement: function (target, paused) {
        var element = this._elementPool.pop();
        if (!element) {
            element = new HashElement();
        }
        element.target = target;
        element.paused = !!paused;
        return element;
    },

    _putElement: function (element) {
        element.actions.length = 0;
        element.actionIndex = 0;
        element.currentAction = null;
        element.paused = false;
        element.target = null;
        element.lock = false;
        this._elementPool.push(element);
    },

    /**
     * !#en
     * Adds an action with a target.<br/>
     * If the target is already present, then the action will be added to the existing target.
     * If the target is not present, a new instance of this target will be created either paused or not, and the action will be added to the newly created target.
     * When the target is paused, the queued actions won't be 'ticked'.
     * !#zh
     * 增加一个动作，同时还需要提供动作的目标对象，目标对象是否暂停作为参数。<br/>
     * 如果目标已存在，动作将会被直接添加到现有的节点中。<br/>
     * 如果目标不存在，将为这一目标创建一个新的实例，并将动作添加进去。<br/>
     * 当目标状态的 paused 为 true，动作将不会被执行
     *
     * @method addAction
     * @param {Action} action
     * @param {Node} target
     * @param {Boolean} paused
     */
    addAction:function (action, target, paused) {
        if (!action || !target) {
            cc.errorID(1000);
            return;
        }

        //check if the action target already exists
        var element = this._hashTargets[target._id];
        //if doesn't exists, create a hashelement and push in mpTargets
        if (!element) {
            element = this._getElement(target, paused);
            this._hashTargets[target._id] = element;
            this._arrayTargets.push(element);
        }
        else if (!element.actions) {
            element.actions = [];
        }

        element.actions.push(action);
        action.startWithTarget(target);
    },

    /**
     * !#en Removes all actions from all the targets.
     * !#zh 移除所有对象的所有动作。
     * @method removeAllActions
     */
    removeAllActions:function () {
        var locTargets = this._arrayTargets;
        for (var i = 0; i < locTargets.length; i++) {
            var element = locTargets[i];
            if (element)
                this._putElement(element);
        }
        this._arrayTargets.length = 0;
        this._hashTargets = js.createMap(true);
    },
    /**
     * !#en
     * Removes all actions from a certain target. <br/>
     * All the actions that belongs to the target will be removed.
     * !#zh
     * 移除指定对象上的所有动作。<br/>
     * 属于该目标的所有的动作将被删除。
     * @method removeAllActionsFromTarget
     * @param {Node} target
     * @param {Boolean} forceDelete
     */
    removeAllActionsFromTarget:function (target, forceDelete) {
        // explicit null handling
        if (target == null)
            return;
        var element = this._hashTargets[target._id];
        if (element) {
            element.actions.length = 0;
            this._deleteHashElement(element);
        }
    },
    /**
     * !#en Removes an action given an action reference.
     * !#zh 移除指定的动作。
     * @method removeAction 
     * @param {Action} action
     */
    removeAction:function (action) {
        // explicit null handling
        if (!action) {
            return;
        }
        var target = action.getOriginalTarget();
        var element = this._hashTargets[target._id];

        if (!element) {
            return;
        }

        for (var i = 0; i < element.actions.length; i++) {
            if (element.actions[i] === action) {
                element.actions.splice(i, 1);
                // update actionIndex in case we are in tick. looping over the actions
                if (element.actionIndex >= i)
                    element.actionIndex--;
                break;
            }
        }
    },

    _removeActionByTag (tag, element, target) {
        for (var i = 0, l = element.actions.length; i < l; ++i) {
            var action = element.actions[i];
            if (action && action.getTag() === tag) {
                if (target && action.getOriginalTarget() !== target) {
                    continue;
                }
                this._removeActionAtIndex(i, element);
                break;
            }
        }
    },

    /**
     * !#en Removes an action given its tag and the target.
     * !#zh 删除指定对象下特定标签的一个动作，将删除首个匹配到的动作。
     * @method removeActionByTag
     * @param {Number} tag
     * @param {Node} [target]
     */
    removeActionByTag:function (tag, target) {
        if(tag === cc.Action.TAG_INVALID)
            cc.logID(1002);

        let hashTargets = this._hashTargets;
        if (target) {
            var element = hashTargets[target._id];
            if (element) {
                this._removeActionByTag(tag, element, target);
            }
        }
        else {
            for (let name in hashTargets) {
                let element = hashTargets[name];
                this._removeActionByTag(tag, element);
            }
        }
    },

    /**
     * !#en Gets an action given its tag an a target.
     * !#zh 通过目标对象和标签获取一个动作。
     * @method getActionByTag
     * @param {Number} tag
     * @param {Node} target
     * @return {Action|Null}  return the Action with the given tag on success
     */
    getActionByTag:function (tag, target) {
        if(tag === cc.Action.TAG_INVALID)
            cc.logID(1004);

        var element = this._hashTargets[target._id];
        if (element) {
            if (element.actions != null) {
                for (var i = 0; i < element.actions.length; ++i) {
                    var action = element.actions[i];
                    if (action && action.getTag() === tag)
                        return action;
                }
            }
            cc.logID(1005, tag);
        }
        return null;
    },


    /**
     * !#en
     * Returns the numbers of actions that are running in a certain target. <br/>
     * Composable actions are counted as 1 action. <br/>
     * Example: <br/>
     * - If you are running 1 Sequence of 7 actions, it will return 1. <br/>
     * - If you are running 7 Sequences of 2 actions, it will return 7.
     * !#zh
     * 返回指定对象下所有正在运行的动作数量。 <br/>
     * 组合动作被算作一个动作。<br/>
     * 例如：<br/>
     *  - 如果您正在运行 7 个动作组成的序列动作（Sequence），这个函数将返回 1。<br/>
     *  - 如果你正在运行 2 个序列动作（Sequence）和 5 个普通动作，这个函数将返回 7。<br/>
     *
     * @method getNumberOfRunningActionsInTarget
     * @param {Node} target
     * @return {Number}
     */
    getNumberOfRunningActionsInTarget:function (target) {
        var element = this._hashTargets[target._id];
        if (element)
            return (element.actions) ? element.actions.length : 0;

        return 0;
    },
    /**
     * !#en Pauses the target: all running actions and newly added actions will be paused.
     * !#zh 暂停指定对象：所有正在运行的动作和新添加的动作都将会暂停。
     * @method pauseTarget
     * @param {Node} target
     */
    pauseTarget:function (target) {
        var element = this._hashTargets[target._id];
        if (element)
            element.paused = true;
    },
    /**
     * !#en Resumes the target. All queued actions will be resumed.
     * !#zh 让指定目标恢复运行。在执行序列中所有被暂停的动作将重新恢复运行。
     * @method resumeTarget
     * @param {Node} target
     */
    resumeTarget:function (target) {
        var element = this._hashTargets[target._id];
        if (element)
            element.paused = false;
    },

    /**
     * !#en Pauses all running actions, returning a list of targets whose actions were paused.
     * !#zh 暂停所有正在运行的动作，返回一个包含了那些动作被暂停了的目标对象的列表。
     * @method pauseAllRunningActions
     * @return {Array}  a list of targets whose actions were paused.
     */
    pauseAllRunningActions:function(){
        var idsWithActions = [];
        var locTargets = this._arrayTargets;
        for(var i = 0; i< locTargets.length; i++){
            var element = locTargets[i];
            if(element && !element.paused){
                element.paused = true;
                idsWithActions.push(element.target);
            }
        }
        return idsWithActions;
    },

    /**
     * !#en Resume a set of targets (convenience function to reverse a pauseAllRunningActions or pauseTargets call).
     * !#zh 让一组指定对象恢复运行（用来逆转 pauseAllRunningActions 效果的便捷函数）。
     * @method resumeTargets
     * @param {Array} targetsToResume
     */
    resumeTargets:function(targetsToResume){
        if (!targetsToResume)
            return;

        for (var i = 0; i< targetsToResume.length; i++) {
            if(targetsToResume[i])
                this.resumeTarget(targetsToResume[i]);
        }
    },

    /**
     * !#en Pause a set of targets.
     * !#zh 暂停一组指定对象。
     * @method pauseTargets
     * @param {Array} targetsToPause
     */
    pauseTargets:function(targetsToPause){
        if (!targetsToPause)
            return;

        for (var i = 0; i< targetsToPause.length; i++) {
            if (targetsToPause[i])
                this.pauseTarget(targetsToPause[i]);
        }
    },

    /**
     * !#en
     * purges the shared action manager. It releases the retained instance. <br/>
     * because it uses this, so it can not be static.
     * !#zh
     * 清除共用的动作管理器。它释放了持有的实例。 <br/>
     * 因为它使用 this，因此它不能是静态的。
     * @method purgeSharedManager
     */
    purgeSharedManager:function () {
        cc.director.getScheduler().unscheduleUpdate(this);
    },

    //protected
    _removeActionAtIndex:function (index, element) {
        var action = element.actions[index];

        element.actions.splice(index, 1);

        // update actionIndex in case we are in tick. looping over the actions
        if (element.actionIndex >= index)
            element.actionIndex--;

        if (element.actions.length === 0) {
            this._deleteHashElement(element);
        }
    },

    _deleteHashElement:function (element) {
        var ret = false;
        if (element && !element.lock) {
            if (this._hashTargets[element.target._id]) {
                delete this._hashTargets[element.target._id];
                var targets = this._arrayTargets;
                for (var i = 0, l = targets.length; i < l; i++) {
                    if (targets[i] === element) {
                        targets.splice(i, 1);
                        break;
                    }
                }
                this._putElement(element);
                ret = true;
            }
        }
        return ret;
    },

    /**
     * !#en The ActionManager update。
     * !#zh ActionManager 主循环。
     * @method update
     * @param {Number} dt delta time in seconds
     */
    update:function (dt) {
        var locTargets = this._arrayTargets , locCurrTarget;
        for (var elt = 0; elt < locTargets.length; elt++) {
            this._currentTarget = locTargets[elt];
            locCurrTarget = this._currentTarget;
            if (!locCurrTarget.paused && locCurrTarget.actions) {
                locCurrTarget.lock = true;
                // The 'actions' CCMutableArray may change while inside this loop.
                for (locCurrTarget.actionIndex = 0; locCurrTarget.actionIndex < locCurrTarget.actions.length; locCurrTarget.actionIndex++) {
                    locCurrTarget.currentAction = locCurrTarget.actions[locCurrTarget.actionIndex];
                    if (!locCurrTarget.currentAction)
                        continue;

                    //use for speed
                    locCurrTarget.currentAction.step(dt * ( locCurrTarget.currentAction._speedMethod ? locCurrTarget.currentAction._speed : 1 ) );
                    
                    if (locCurrTarget.currentAction && locCurrTarget.currentAction.isDone()) {
                        locCurrTarget.currentAction.stop();
                        var action = locCurrTarget.currentAction;
                        // Make currentAction nil to prevent removeAction from salvaging it.
                        locCurrTarget.currentAction = null;
                        this.removeAction(action);
                    }

                    locCurrTarget.currentAction = null;
                }
                locCurrTarget.lock = false;
            }
            // only delete currentTarget if no actions were scheduled during the cycle (issue #481)
            if (locCurrTarget.actions.length === 0) {
                this._deleteHashElement(locCurrTarget) && elt--;
            }
        }
    }
};

if (CC_TEST) {
    cc.ActionManager.prototype.isTargetPaused_TEST = function (target) {
        var element = this._hashTargets[target._id];
        return element.paused;
    };
}