[76] | 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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