tv_xiaoyouxi/games/yd/frameworks/cocos2d-html5/extensions/ccui/system/UIHelper.js

/****************************************************************************
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.

 http://www.cocos2d-x.org

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 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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/**
 * ccui.helper is the singleton object which is the Helper object contains some functions for seek widget
 * @class
 * @name ccui.helper
 */
ccui.helper = {
	/**
	 * Finds a widget whose tag equals to param tag from root widget.
	 * @param {ccui.Widget} root
	 * @param {number} tag
	 * @returns {ccui.Widget}
	 */
	seekWidgetByTag: function (root, tag) {
	    if (!root)
	        return null;
	    if (root.getTag() == tag)
	        return root;

	    var arrayRootChildren = root.getChildren();
	    var length = arrayRootChildren.length;
	    for (var i = 0; i < length; i++) {
	        var child = arrayRootChildren[i];
	        var res = ccui.helper.seekWidgetByTag(child, tag);
	        if (res != null)
	            return res;
	    }
	    return null;
	},

	/**
	 * Finds a widget whose name equals to param name from root widget.
	 * @param {ccui.Widget} root
	 * @param {String} name
	 * @returns {ccui.Widget}
	 */
	seekWidgetByName: function (root, name) {
	    if (!root)
	        return null;
	    if (root.getName() == name)
	        return root;
	    var arrayRootChildren = root.getChildren();
	    var length = arrayRootChildren.length;
	    for (var i = 0; i < length; i++) {
	        var child = arrayRootChildren[i];
	        var res = ccui.helper.seekWidgetByName(child, name);
	        if (res != null)
	            return res;
	    }
	    return null;
	},

	/**
	 * Finds a widget whose name equals to param name from root widget.
	 * RelativeLayout will call this method to find the widget witch is needed.
	 * @param {ccui.Widget} root
	 * @param {String} name
	 * @returns {ccui.Widget}
	 */
	seekWidgetByRelativeName: function (root, name) {
	    if (!root)
	        return null;
	    var arrayRootChildren = root.getChildren();
	    var length = arrayRootChildren.length;
	    for (var i = 0; i < length; i++) {
	        var child = arrayRootChildren[i];
	        var layoutParameter = child.getLayoutParameter(ccui.LayoutParameter.RELATIVE);
	        if (layoutParameter && layoutParameter.getRelativeName() == name)
	            return child;
	    }
	    return null;
	},

    /**
     * Finds a widget whose action tag equals to param name from root widget.
     * @param {ccui.Widget} root
     * @param {Number} tag
     * @returns {ccui.Widget}
     */
	seekActionWidgetByActionTag: function (root, tag) {
	    if (!root)
	        return null;
	    if (root.getActionTag() == tag)
	        return root;
	    var arrayRootChildren = root.getChildren();
	    for (var i = 0; i < arrayRootChildren.length; i++) {
	        var child = arrayRootChildren[i];
	        var res = ccui.helper.seekActionWidgetByActionTag(child, tag);
	        if (res != null)
	            return res;
	    }
	    return null;
	}
};