fbird/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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 copies of the Software, and to permit persons to whom the Software is
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

//todo maybe need change here


/**
 * 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;
    },

    _activeLayout: true,
    /**
     * Refresh object and it's children layout state
     * @param {cc.Node} rootNode
     */
    doLayout: function (rootNode) {
        if (!this._activeLayout)
            return;
        var children = rootNode.getChildren(), node;
        for(var i = 0, len = children.length;i < len; i++) {
            node = children[i];
            var com = node.getComponent(ccui.LayoutComponent.NAME);
            var parent = node.getParent();
            if (null != com && null !== parent && com.refreshLayout)
                com.refreshLayout();
        }
    },

    changeLayoutSystemActiveState: function (active) {
        this._activeLayout = active;
    },

    /**
     * restrict capInsetSize, when the capInsets' width is larger than the textureSize, it will restrict to 0,   <br/>
     * the height goes the same way as width.
     * @param {cc.Rect} capInsets
     * @param {cc.Size} textureSize
     */
    restrictCapInsetRect: function (capInsets, textureSize) {
        var x = capInsets.x, y = capInsets.y;
        var width = capInsets.width, height = capInsets.height;

        if (textureSize.width < width) {
            x = 0.0;
            width = 0.0;
        }
        if (textureSize.height < height) {
            y = 0.0;
            height = 0.0;
        }
        return cc.rect(x, y, width, height);
    },

    _createSpriteFromBase64: function (base64String, key) {
        var texture2D = cc.textureCache.getTextureForKey(key);

        if (!texture2D) {
            var image = new Image();
            image.src = base64String;
            cc.textureCache.cacheImage(key, image);
            texture2D = cc.textureCache.getTextureForKey(key);
        }

        var sprite = new cc.Sprite(texture2D);

        return sprite;
    }
};