105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
/* 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"
|
|
});
|