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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository 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: separator
* {String} String used to separate layers.
*/
separator: ", ",
/**
* APIProperty: template
* {String} Template for the attribution. This has to include the substring
* "${layers}", which will be replaced by the layer specific
* attributions, separated by <separator>. The default is "${layers}".
*/
template: "${layers}",
/**
* Constructor: OpenLayers.Control.Attribution
*
* Parameters:
* options - {Object} Options for control.
*/
/**
* 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 = OpenLayers.String.format(this.template, {
layers: attributions.join(this.separator)
});
}
},
CLASS_NAME: "OpenLayers.Control.Attribution"
});
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