GZ/nwyj/.svn/pristine/15/159cc50a2cc3e716b784edcd88810b6891155c00.svn-base

/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/*
 * Private internal class for reading and applying state
 */
Ext.LayoutStateManager = function(layout) {
	// default empty state
	this.state = {
		north : {},
		south : {},
		east : {},
		west : {}
	};
};

Ext.LayoutStateManager.prototype = {
	init : function(layout, provider) {
		this.provider = provider;
		var state = provider.get(layout.id + "-layout-state");
		if (state) {
			var wasUpdating = layout.isUpdating();
			if (!wasUpdating) {
				layout.beginUpdate();
			}
			for (var key in state) {
				if (typeof state[key] != "function") {
					var rstate = state[key];
					var r = layout.getRegion(key);
					if (r && rstate) {
						if (rstate.size) {
							r.resizeTo(rstate.size);
						}
						if (rstate.collapsed == true) {
							r.collapse(true);
						} else {
							r.expand(null, true);
						}
					}
				}
			}
			if (!wasUpdating) {
				layout.endUpdate();
			}
			this.state = state;
		}
		this.layout = layout;
		layout.on("regionresized", this.onRegionResized, this);
		layout.on("regioncollapsed", this.onRegionCollapsed, this);
		layout.on("regionexpanded", this.onRegionExpanded, this);
	},

	storeState : function() {
		this.provider.set(this.layout.id + "-layout-state", this.state);
	},

	onRegionResized : function(region, newSize) {
		this.state[region.getPosition()].size = newSize;
		this.storeState();
	},

	onRegionCollapsed : function(region) {
		this.state[region.getPosition()].collapsed = true;
		this.storeState();
	},

	onRegionExpanded : function(region) {
		this.state[region.getPosition()].collapsed = false;
		this.storeState();
	}
};