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Viewing changes to gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Control/Attribution.js

  • Committer: larshelge at gmail
  • Date: 2009-03-03 16:46:36 UTC
  • Revision ID: larshelge@gmail.com-20090303164636-2sjlrquo7ib1gf7r
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gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Control/Attribution.js
 
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/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
 
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 * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 
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 * full text of the license. */
 
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/**
 
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 * @requires OpenLayers/Control.js
 
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 */
 
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/**
 
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 * Class: OpenLayers.Control.Attribution
 
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 * Add attribution from layers to the map display. Uses 'attribution' property
 
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 * of each layer.
 
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 *
 
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 * Inherits from:
 
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 *  - <OpenLayers.Control>
 
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 */
 
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OpenLayers.Control.Attribution = 
 
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  OpenLayers.Class(OpenLayers.Control, {
 
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    /**
 
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     * APIProperty: seperator
 
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     * {String} String used to seperate layers.
 
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     */
 
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    separator: ", ",
 
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    /**
 
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     * Constructor: OpenLayers.Control.Attribution 
 
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     * 
 
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     * Parameters:
 
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     * options - {Object} Options for control.
 
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     */
 
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    initialize: function(options) {
 
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        OpenLayers.Control.prototype.initialize.apply(this, arguments);
 
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    },
 
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    /** 
 
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     * Method: destroy
 
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     * Destroy control.
 
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     */
 
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    destroy: function() {
 
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        this.map.events.un({
 
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            "removelayer": this.updateAttribution,
 
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            "addlayer": this.updateAttribution,
 
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            "changelayer": this.updateAttribution,
 
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            "changebaselayer": this.updateAttribution,
 
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            scope: this
 
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        });
 
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        OpenLayers.Control.prototype.destroy.apply(this, arguments);
 
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    },    
 
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    /**
 
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     * Method: draw
 
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     * Initialize control.
 
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     * 
 
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     * Returns: 
 
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     * {DOMElement} A reference to the DIV DOMElement containing the control
 
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     */    
 
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    draw: function() {
 
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        OpenLayers.Control.prototype.draw.apply(this, arguments);
 
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        this.map.events.on({
 
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            'changebaselayer': this.updateAttribution,
 
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            'changelayer': this.updateAttribution,
 
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            'addlayer': this.updateAttribution,
 
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            'removelayer': this.updateAttribution,
 
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            scope: this
 
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        });
 
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        this.updateAttribution();
 
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        return this.div;    
 
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    },
 
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    /**
 
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     * Method: updateAttribution
 
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     * Update attribution string.
 
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     */
 
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    updateAttribution: function() {
 
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        var attributions = [];
 
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        if (this.map && this.map.layers) {
 
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            for(var i=0, len=this.map.layers.length; i<len; i++) {
 
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                var layer = this.map.layers[i];
 
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                if (layer.attribution && layer.getVisibility()) {
 
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                    attributions.push( layer.attribution );
 
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                }
 
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            }  
 
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            this.div.innerHTML = attributions.join(this.separator);
 
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        }
 
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    },
 
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    CLASS_NAME: "OpenLayers.Control.Attribution"
 
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});