| /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for | |
| * full list of contributors). Published under the Clear BSD license. | |
| * See http://svn.openlayers.org/trunk/openlayers/license.txt for the | |
| * full text of the license. */ | |
| /** | |
| * @requires OpenLayers/Control.js | |
| */ | |
| /** | |
| * Class: OpenLayers.Control.Attribution | |
| * The attribution control adds attribution from layers to the map display. | |
| * It uses 'attribution' property of each layer. | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Control> | |
| */ | |
| OpenLayers.Control.Attribution = | |
| OpenLayers.Class(OpenLayers.Control, { | |
| /** | |
| * APIProperty: seperator | |
| * {String} String used to seperate layers. | |
| */ | |
| separator: ", ", | |
| /** | |
| * Constructor: OpenLayers.Control.Attribution | |
| * | |
| * Parameters: | |
| * options - {Object} Options for control. | |
| */ | |
| initialize: function(options) { | |
| OpenLayers.Control.prototype.initialize.apply(this, arguments); | |
| }, | |
| /** | |
| * Method: destroy | |
| * Destroy control. | |
| */ | |
| destroy: function() { | |
| this.map.events.un({ | |
| "removelayer": this.updateAttribution, | |
| "addlayer": this.updateAttribution, | |
| "changelayer": this.updateAttribution, | |
| "changebaselayer": this.updateAttribution, | |
| scope: this | |
| }); | |
| OpenLayers.Control.prototype.destroy.apply(this, arguments); | |
| }, | |
| /** | |
| * Method: draw | |
| * Initialize control. | |
| * | |
| * Returns: | |
| * {DOMElement} A reference to the DIV DOMElement containing the control | |
| */ | |
| draw: function() { | |
| OpenLayers.Control.prototype.draw.apply(this, arguments); | |
| this.map.events.on({ | |
| 'changebaselayer': this.updateAttribution, | |
| 'changelayer': this.updateAttribution, | |
| 'addlayer': this.updateAttribution, | |
| 'removelayer': this.updateAttribution, | |
| scope: this | |
| }); | |
| this.updateAttribution(); | |
| return this.div; | |
| }, | |
| /** | |
| * Method: updateAttribution | |
| * Update attribution string. | |
| */ | |
| updateAttribution: function() { | |
| var attributions = []; | |
| if (this.map && this.map.layers) { | |
| for(var i=0, len=this.map.layers.length; i<len; i++) { | |
| var layer = this.map.layers[i]; | |
| if (layer.attribution && layer.getVisibility()) { | |
| // add attribution only if attribution text is unique | |
| if (OpenLayers.Util.indexOf( | |
| attributions, layer.attribution) === -1) { | |
| attributions.push( layer.attribution ); | |
| } | |
| } | |
| } | |
| this.div.innerHTML = attributions.join(this.separator); | |
| } | |
| }, | |
| CLASS_NAME: "OpenLayers.Control.Attribution" | |
| }); | |