/* layout.js - very basic layout management */

/**

  @class a layout manager manages a div and the layout of objects

  inside it.

*/

IriSP.LayoutManager = function(options) {

    this._Popcorn = null;

    this._widgets = [];

    this._div = "LdtPlayer";

    this._width = 640;

    if (options === undefined) {

      options = {};

    };

    if (options.hasOwnProperty('container')) {

      this._div = options.container;

    }

    if (options.hasOwnProperty('width')) {

      this._width = options.width;

    }    

    if (options.hasOwnProperty('height')) {

      this._height = options.height;

    } 

    /* this is a shortcut */

    this.selector = IriSP.jQuery("#" + this._div);

    this.selector.css("width", this._width);

    if (this._height !== undefined)

      this.selector.css("height", this._height);

};

/** 

   Set the popcorn instance used by the manager.

   we need this special setter because of a chicken and egg problem :

   we want the manager to use popcorn but the popcorn div will be managed

   by the manager. So we need a way to set the instance the manager uses

*/

IriSP.LayoutManager.prototype.setPopcornInstance = function(popcorn) {

    this._Popcorn = popcorn;

}

/** create a subdiv with an unique id, and a spacer div as well.

    @param widgetName the name of the widget.

    @return an array of the form [createdivId, spacerdivId].

*/

IriSP.LayoutManager.prototype.createDiv = function(widgetName) {

    if (typeof(widgetName) === "undefined")

       widgetName = "";

    var newDiv = IriSP.guid(this._div + "_widget_" + widgetName + "_");

    var spacerDiv = IriSP.guid("LdtPlayer_spacer_");

    this._widgets.push([widgetName, newDiv]);    

    var divTempl = "<div id='{{id}}' style='width: {{width}}px; position: relative;'></div";

    var spacerTempl = "<div id='{{spacer_id}}' style='width: {{width}}px; position: relative; height: {{spacer_div_height}};'></div";

    var divCode = Mustache.to_html(divTempl, {id: newDiv, width: this._width});

    var spacerCode = Mustache.to_html(spacerTempl, {spacer_id: spacerDiv, width: this._width,

                                                    spacer_div_height: IriSP.widgetsDefaults.LayoutManager.spacer_div_height });

    this.selector.append(divCode);

    this.selector.append(spacerCode);

    return [newDiv, spacerDiv];

};