92 lines
2.3 KiB
JavaScript
92 lines
2.3 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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/**
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* @class
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*/
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OpenLayers.Layer = Class.create();
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OpenLayers.Layer.prototype = {
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/** @type String */
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name: null,
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/** @type DOMElement */
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div: null,
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/** This variable is set in map.addLayer, not within the layer itself
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* @type OpenLayers.Map */
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map: null,
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/**
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* @constructor
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*
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* @param {String} name
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*/
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initialize: function(name) {
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if (arguments.length > 0) {
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this.name = name;
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if (this.div == null) {
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this.div = OpenLayers.Util.createDiv();
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this.div.style.width = "100%";
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this.div.style.height = "100%";
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}
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}
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},
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/**
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* Destroy is a destructor: this is to alleviate cyclic references which
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* the Javascript garbage cleaner can not take care of on its own.
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*/
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destroy: function() {
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if (this.map != null) {
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this.map.removeLayer(this);
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}
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this.map = null;
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},
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/**
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* @params {OpenLayers.Bounds} bound
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* @params {Boolean} zoomChanged tells when zoom has changed, as layers have to do some init work in that case.
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*/
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moveTo: function (bound, zoomChanged) {
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// not implemented here
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return;
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},
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/**
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* @param {OpenLayers.Map} map
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*/
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setMap: function(map) {
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this.map = map;
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},
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/**
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* @returns Whether or not the layer is a base layer. This should be
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* determined individually by all subclasses.
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* @type Boolean
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*/
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isBaseLayer: function() {
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//this function should be implemented by all subclasses.
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},
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/**
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* @returns Whether or not the layer is visible
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* @type Boolean
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*/
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getVisibility: function() {
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return (this.div.style.display != "none");
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},
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/**
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* @param {bool} visible
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*/
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setVisibility: function(visible) {
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this.div.style.display = (visible) ? "block" : "none";
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if ((visible) && (this.map != null)) {
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this.moveTo(this.map.getExtent());
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}
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer"
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};
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