1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Control.js |
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8 | */ |
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9 | |
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10 | /** |
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11 | * Class: OpenLayers.Control.Attribution |
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12 | * The attribution control adds attribution from layers to the map display. |
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13 | * It uses 'attribution' property of each layer. |
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14 | * |
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15 | * Inherits from: |
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16 | * - <OpenLayers.Control> |
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17 | */ |
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18 | OpenLayers.Control.Attribution = |
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19 | OpenLayers.Class(OpenLayers.Control, { |
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20 | |
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21 | /** |
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22 | * APIProperty: seperator |
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23 | * {String} String used to seperate layers. |
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24 | */ |
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25 | separator: ", ", |
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26 | |
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27 | /** |
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28 | * Constructor: OpenLayers.Control.Attribution |
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29 | * |
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30 | * Parameters: |
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31 | * options - {Object} Options for control. |
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32 | */ |
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33 | initialize: function(options) { |
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34 | OpenLayers.Control.prototype.initialize.apply(this, arguments); |
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35 | }, |
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36 | |
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37 | /** |
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38 | * Method: destroy |
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39 | * Destroy control. |
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40 | */ |
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41 | destroy: function() { |
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42 | this.map.events.un({ |
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43 | "removelayer": this.updateAttribution, |
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44 | "addlayer": this.updateAttribution, |
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45 | "changelayer": this.updateAttribution, |
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46 | "changebaselayer": this.updateAttribution, |
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47 | scope: this |
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48 | }); |
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49 | |
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50 | OpenLayers.Control.prototype.destroy.apply(this, arguments); |
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51 | }, |
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52 | |
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53 | /** |
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54 | * Method: draw |
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55 | * Initialize control. |
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56 | * |
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57 | * Returns: |
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58 | * {DOMElement} A reference to the DIV DOMElement containing the control |
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59 | */ |
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60 | draw: function() { |
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61 | OpenLayers.Control.prototype.draw.apply(this, arguments); |
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62 | |
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63 | this.map.events.on({ |
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64 | 'changebaselayer': this.updateAttribution, |
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65 | 'changelayer': this.updateAttribution, |
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66 | 'addlayer': this.updateAttribution, |
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67 | 'removelayer': this.updateAttribution, |
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68 | scope: this |
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69 | }); |
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70 | this.updateAttribution(); |
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71 | |
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72 | return this.div; |
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73 | }, |
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74 | |
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75 | /** |
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76 | * Method: updateAttribution |
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77 | * Update attribution string. |
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78 | */ |
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79 | updateAttribution: function() { |
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80 | var attributions = []; |
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81 | if (this.map && this.map.layers) { |
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82 | for(var i=0, len=this.map.layers.length; i<len; i++) { |
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83 | var layer = this.map.layers[i]; |
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84 | if (layer.attribution && layer.getVisibility()) { |
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85 | // add attribution only if attribution text is unique |
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86 | if (OpenLayers.Util.indexOf( |
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87 | attributions, layer.attribution) === -1) { |
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88 | attributions.push( layer.attribution ); |
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89 | } |
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90 | } |
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91 | } |
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92 | this.div.innerHTML = attributions.join(this.separator); |
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93 | } |
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94 | }, |
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95 | |
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96 | CLASS_NAME: "OpenLayers.Control.Attribution" |
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97 | }); |
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