/**
 * The main "view" manager (in a standard MVC conception) of the application.
 * It register various containers org.argeo.ria.components.viewPane and feed them with org.argeo.ria.components.IView implementations.
 * It is a singleton and can thus be called by any part of the application.
 * 
 * @author Charles du Jeu
 */
qx.Class.define("org.argeo.ria.components.ViewsManager",
{
	type : "singleton",
  extend : qx.core.Object,

  properties : {
  	/**
  	 * The application root (like Application.getRoot()), used to attach and show modal windows.
  	 */
  	applicationRoot : {init : null},
  	/**
  	 * The main container for the org.argeo.ria.components.ViewPane instances. 
  	 */
  	viewPanesContainer : {init: null},
  	/**
  	 * Keeps the currently focused viewPane. 
  	 */
  	currentFocus : {init :null}
  },
  construct : function(){
  	this.views = {};
  },
  members : {
  	/**
  	 * Initialize and load a given IView implementation into a viewPane.
  	 * The IView itself is returned.
  	 * 
  	 * @param classObj {Clazz} The class object to instantiate
  	 * @param viewPaneId {String} The unique ID of the view pane
  	 * @param data {Mixed} Any data provided by the opener.
  	 * @return {org.argeo.ria.components.IView}
  	 */
  	initIViewClass: function(classObj, viewPaneId, data){
  		var viewPane = this.getViewPaneById(viewPaneId);  		
  		var iView = new classObj;
		iView.init(viewPane, data);
		var existingView = viewPane.contentExists(iView.getInstanceId()); 
		if(existingView){
			delete iView;
			return existingView;
		}
		var commands = iView.getCommands();
		//viewPane.empty();
		if(commands){
			viewPane.setCommands(commands);
			org.argeo.ria.event.CommandsManager.getInstance().addCommands(commands, "view:"+viewPaneId, viewPaneId);
		}
		viewPane.setContent(iView);
		this.setViewPaneFocus(viewPane);
		return iView;
  	},
  	
  	/**
  	 * Registers a new viewPane
  	 * @param viewPane {org.argeo.ria.components.ViewPane} The new ViewPane instance
  	 */
  	registerViewPane : function(viewPane){
		this.views[viewPane.getViewId()] = viewPane;
	  	viewPane.addListener("changeSelection", function(e){
	  		var viewSelection = e.getTarget().getViewSelection();
	  		if(!viewSelection) return;
	  		org.argeo.ria.event.CommandsManager.getInstance().refreshCommands(viewSelection);
		});
		viewPane.addListener("changeFocus", function(e){
			this.setViewPaneFocus(e.getTarget());
		}, this);
  	},
  	/**
  	 * Sets a given viewPane as the currently focused one. Blur the others.
  	 * @param viewPane {org.argeo.ria.components.ViewPane} The viewPane (or TabbedViewPane) to focus on.
  	 */
  	setViewPaneFocus : function(viewPane){
		for(var key in this.views){
			this.views[key].blur();
		}
		this.setCurrentFocus(viewPane);
		viewPane.focus();  		
  	},
  	/**
  	 * Returns a viewPane by its unique id.
  	 * @param viewPaneId {String} The unique id
  	 * @return {org.argeo.ria.components.ViewPane}
  	 */
  	getViewPaneById : function(viewPaneId){
  		if(this.views[viewPaneId]) return this.views[viewPaneId];
		throw new Error("Cannot find view '"+viewPaneId+"'");  		
  	},
  	/**
  	 * Returns a viewPane current viewSelection object
  	 * @param viewPaneId {String} The unique id. 
  	 * @return {org.argeo.ria.components.ViewSelection}
  	 */
  	getViewPaneSelection : function(viewPaneId){
  		return this.getViewPaneById(viewPaneId).getViewSelection();
  	},
  	/**
  	 * Changes a viewPane title dynamically.
  	 * @param viewPaneId {String} ViewPane unique Id. 
  	 * @param viewTitle {String} the new title for this viewPane.
  	 */
  	setViewPaneTitle : function(viewPaneId, viewTitle){
  		this.getViewPaneById(viewPaneId).setViewTitle(viewTitle);
  	}
  }
});