[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 | /** |
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| 8 | * @requires OpenLayers/Control.js |
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| 9 | * @requires OpenLayers/Feature/Vector.js |
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| 10 | * @requires OpenLayers/Handler/Feature.js |
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| 11 | * @requires OpenLayers/Layer/Vector/RootContainer.js |
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| 12 | */ |
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| 13 | |
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| 14 | /** |
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| 15 | * Class: OpenLayers.Control.SelectFeature |
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| 16 | * The SelectFeature control selects vector features from a given layer on |
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| 17 | * click or hover. |
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| 18 | * |
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| 19 | * Inherits from: |
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| 20 | * - <OpenLayers.Control> |
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| 21 | */ |
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| 22 | OpenLayers.Control.SelectFeature = OpenLayers.Class(OpenLayers.Control, { |
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| 23 | |
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| 24 | /** |
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| 25 | * Constant: EVENT_TYPES |
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| 26 | * |
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| 27 | * Supported event types: |
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| 28 | * - *beforefeaturehighlighted* Triggered before a feature is highlighted |
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| 29 | * - *featurehighlighted* Triggered when a feature is highlighted |
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| 30 | * - *featureunhighlighted* Triggered when a feature is unhighlighted |
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| 31 | */ |
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| 32 | EVENT_TYPES: ["beforefeaturehighlighted", "featurehighlighted", "featureunhighlighted"], |
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| 33 | |
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| 34 | /** |
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| 35 | * Property: multipleKey |
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| 36 | * {String} An event modifier ('altKey' or 'shiftKey') that temporarily sets |
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| 37 | * the <multiple> property to true. Default is null. |
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| 38 | */ |
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| 39 | multipleKey: null, |
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| 40 | |
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| 41 | /** |
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| 42 | * Property: toggleKey |
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| 43 | * {String} An event modifier ('altKey' or 'shiftKey') that temporarily sets |
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| 44 | * the <toggle> property to true. Default is null. |
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| 45 | */ |
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| 46 | toggleKey: null, |
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| 47 | |
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| 48 | /** |
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| 49 | * APIProperty: multiple |
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| 50 | * {Boolean} Allow selection of multiple geometries. Default is false. |
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| 51 | */ |
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| 52 | multiple: false, |
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| 53 | |
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| 54 | /** |
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| 55 | * APIProperty: clickout |
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| 56 | * {Boolean} Unselect features when clicking outside any feature. |
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| 57 | * Default is true. |
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| 58 | */ |
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| 59 | clickout: true, |
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| 60 | |
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| 61 | /** |
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| 62 | * APIProperty: toggle |
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| 63 | * {Boolean} Unselect a selected feature on click. Default is false. Only |
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| 64 | * has meaning if hover is false. |
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| 65 | */ |
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| 66 | toggle: false, |
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| 67 | |
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| 68 | /** |
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| 69 | * APIProperty: hover |
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| 70 | * {Boolean} Select on mouse over and deselect on mouse out. If true, this |
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| 71 | * ignores clicks and only listens to mouse moves. |
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| 72 | */ |
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| 73 | hover: false, |
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| 74 | |
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| 75 | /** |
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| 76 | * APIProperty: highlightOnly |
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| 77 | * {Boolean} If true do not actually select features (i.e. place them in the |
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| 78 | * layer's selected features array), just highlight them. This property has |
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| 79 | * no effect if hover is false. Defaults to false. |
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| 80 | */ |
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| 81 | highlightOnly: false, |
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| 82 | |
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| 83 | /** |
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| 84 | * APIProperty: box |
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| 85 | * {Boolean} Allow feature selection by drawing a box. |
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| 86 | */ |
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| 87 | box: false, |
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| 88 | |
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| 89 | /** |
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| 90 | * Property: onBeforeSelect |
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| 91 | * {Function} Optional function to be called before a feature is selected. |
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| 92 | * The function should expect to be called with a feature. |
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| 93 | */ |
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| 94 | onBeforeSelect: function() {}, |
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| 95 | |
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| 96 | /** |
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| 97 | * APIProperty: onSelect |
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| 98 | * {Function} Optional function to be called when a feature is selected. |
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| 99 | * The function should expect to be called with a feature. |
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| 100 | */ |
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| 101 | onSelect: function() {}, |
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| 102 | |
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| 103 | /** |
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| 104 | * APIProperty: onUnselect |
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| 105 | * {Function} Optional function to be called when a feature is unselected. |
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| 106 | * The function should expect to be called with a feature. |
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| 107 | */ |
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| 108 | onUnselect: function() {}, |
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| 109 | |
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| 110 | /** |
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| 111 | * Property: scope |
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| 112 | * {Object} The scope to use with the onBeforeSelect, onSelect, onUnselect |
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| 113 | * callbacks. If null the scope will be this control. |
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| 114 | */ |
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| 115 | scope: null, |
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| 116 | |
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| 117 | /** |
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| 118 | * APIProperty: geometryTypes |
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| 119 | * {Array(String)} To restrict selecting to a limited set of geometry types, |
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| 120 | * send a list of strings corresponding to the geometry class names. |
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| 121 | */ |
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| 122 | geometryTypes: null, |
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| 123 | |
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| 124 | /** |
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| 125 | * Property: layer |
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| 126 | * {<OpenLayers.Layer.Vector>} The vector layer with a common renderer |
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| 127 | * root for all layers this control is configured with (if an array of |
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| 128 | * layers was passed to the constructor), or the vector layer the control |
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| 129 | * was configured with (if a single layer was passed to the constructor). |
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| 130 | */ |
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| 131 | layer: null, |
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| 132 | |
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| 133 | /** |
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| 134 | * Property: layers |
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| 135 | * {Array(<OpenLayers.Layer.Vector>} The layers this control will work on, |
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| 136 | * or null if the control was configured with a single layer |
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| 137 | */ |
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| 138 | layers: null, |
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| 139 | |
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| 140 | /** |
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| 141 | * APIProperty: callbacks |
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| 142 | * {Object} The functions that are sent to the handlers.feature for callback |
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| 143 | */ |
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| 144 | callbacks: null, |
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| 145 | |
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| 146 | /** |
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| 147 | * APIProperty: selectStyle |
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| 148 | * {Object} Hash of styles |
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| 149 | */ |
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| 150 | selectStyle: null, |
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| 151 | |
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| 152 | /** |
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| 153 | * Property: renderIntent |
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| 154 | * {String} key used to retrieve the select style from the layer's |
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| 155 | * style map. |
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| 156 | */ |
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| 157 | renderIntent: "select", |
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| 158 | |
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| 159 | /** |
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| 160 | * Property: handlers |
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| 161 | * {Object} Object with references to multiple <OpenLayers.Handler> |
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| 162 | * instances. |
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| 163 | */ |
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| 164 | handlers: null, |
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| 165 | |
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| 166 | /** |
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| 167 | * Constructor: OpenLayers.Control.SelectFeature |
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| 168 | * Create a new control for selecting features. |
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| 169 | * |
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| 170 | * Parameters: |
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| 171 | * layers - {<OpenLayers.Layer.Vector>}, or an array of vector layers. The |
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| 172 | * layer(s) this control will select features from. |
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| 173 | * options - {Object} |
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| 174 | */ |
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| 175 | initialize: function(layers, options) { |
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| 176 | // concatenate events specific to this control with those from the base |
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| 177 | this.EVENT_TYPES = |
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| 178 | OpenLayers.Control.SelectFeature.prototype.EVENT_TYPES.concat( |
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| 179 | OpenLayers.Control.prototype.EVENT_TYPES |
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| 180 | ); |
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| 181 | OpenLayers.Control.prototype.initialize.apply(this, [options]); |
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| 182 | |
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| 183 | if(this.scope === null) { |
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| 184 | this.scope = this; |
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| 185 | } |
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| 186 | this.initLayer(layers); |
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| 187 | var callbacks = { |
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| 188 | click: this.clickFeature, |
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| 189 | clickout: this.clickoutFeature |
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| 190 | }; |
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| 191 | if (this.hover) { |
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| 192 | callbacks.over = this.overFeature; |
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| 193 | callbacks.out = this.outFeature; |
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| 194 | } |
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| 195 | |
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| 196 | this.callbacks = OpenLayers.Util.extend(callbacks, this.callbacks); |
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| 197 | this.handlers = { |
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| 198 | feature: new OpenLayers.Handler.Feature( |
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| 199 | this, this.layer, this.callbacks, |
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| 200 | {geometryTypes: this.geometryTypes} |
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| 201 | ) |
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| 202 | }; |
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| 203 | |
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| 204 | if (this.box) { |
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| 205 | this.handlers.box = new OpenLayers.Handler.Box( |
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| 206 | this, {done: this.selectBox}, |
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| 207 | {boxDivClassName: "olHandlerBoxSelectFeature"} |
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| 208 | ); |
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| 209 | } |
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| 210 | }, |
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| 211 | |
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| 212 | /** |
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| 213 | * Method: initLayer |
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| 214 | * Assign the layer property. If layers is an array, we need to use |
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| 215 | * a RootContainer. |
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| 216 | * |
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| 217 | * Parameters: |
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| 218 | * layers - {<OpenLayers.Layer.Vector>}, or an array of vector layers. |
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| 219 | */ |
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| 220 | initLayer: function(layers) { |
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| 221 | if(layers instanceof Array) { |
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| 222 | this.layers = layers; |
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| 223 | this.layer = new OpenLayers.Layer.Vector.RootContainer( |
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| 224 | this.id + "_container", { |
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| 225 | layers: layers |
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| 226 | } |
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| 227 | ); |
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| 228 | } else { |
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| 229 | this.layer = layers; |
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| 230 | } |
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| 231 | }, |
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| 232 | |
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| 233 | /** |
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| 234 | * Method: destroy |
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| 235 | */ |
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| 236 | destroy: function() { |
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| 237 | if(this.active && this.layers) { |
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| 238 | this.map.removeLayer(this.layer); |
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| 239 | } |
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| 240 | OpenLayers.Control.prototype.destroy.apply(this, arguments); |
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| 241 | if(this.layers) { |
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| 242 | this.layer.destroy(); |
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| 243 | } |
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| 244 | }, |
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| 245 | |
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| 246 | /** |
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| 247 | * Method: activate |
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| 248 | * Activates the control. |
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| 249 | * |
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| 250 | * Returns: |
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| 251 | * {Boolean} The control was effectively activated. |
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| 252 | */ |
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| 253 | activate: function () { |
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| 254 | if (!this.active) { |
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| 255 | if(this.layers) { |
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| 256 | this.map.addLayer(this.layer); |
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| 257 | } |
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| 258 | this.handlers.feature.activate(); |
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| 259 | if(this.box && this.handlers.box) { |
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| 260 | this.handlers.box.activate(); |
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| 261 | } |
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| 262 | } |
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| 263 | return OpenLayers.Control.prototype.activate.apply( |
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| 264 | this, arguments |
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| 265 | ); |
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| 266 | }, |
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| 267 | |
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| 268 | /** |
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| 269 | * Method: deactivate |
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| 270 | * Deactivates the control. |
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| 271 | * |
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| 272 | * Returns: |
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| 273 | * {Boolean} The control was effectively deactivated. |
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| 274 | */ |
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| 275 | deactivate: function () { |
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| 276 | if (this.active) { |
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| 277 | this.handlers.feature.deactivate(); |
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| 278 | if(this.handlers.box) { |
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| 279 | this.handlers.box.deactivate(); |
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| 280 | } |
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| 281 | if(this.layers) { |
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| 282 | this.map.removeLayer(this.layer); |
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| 283 | } |
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| 284 | } |
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| 285 | return OpenLayers.Control.prototype.deactivate.apply( |
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| 286 | this, arguments |
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| 287 | ); |
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| 288 | }, |
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| 289 | |
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| 290 | /** |
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| 291 | * Method: unselectAll |
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| 292 | * Unselect all selected features. To unselect all except for a single |
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| 293 | * feature, set the options.except property to the feature. |
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| 294 | * |
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| 295 | * Parameters: |
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| 296 | * options - {Object} Optional configuration object. |
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| 297 | */ |
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| 298 | unselectAll: function(options) { |
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| 299 | // we'll want an option to supress notification here |
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| 300 | var layers = this.layers || [this.layer]; |
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| 301 | var layer, feature; |
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| 302 | for(var l=0; l<layers.length; ++l) { |
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| 303 | layer = layers[l]; |
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| 304 | for(var i=layer.selectedFeatures.length-1; i>=0; --i) { |
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| 305 | feature = layer.selectedFeatures[i]; |
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| 306 | if(!options || options.except != feature) { |
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| 307 | this.unselect(feature); |
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| 308 | } |
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| 309 | } |
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| 310 | } |
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| 311 | }, |
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| 312 | |
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| 313 | /** |
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| 314 | * Method: clickFeature |
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| 315 | * Called on click in a feature |
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| 316 | * Only responds if this.hover is false. |
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| 317 | * |
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| 318 | * Parameters: |
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| 319 | * feature - {<OpenLayers.Feature.Vector>} |
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| 320 | */ |
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| 321 | clickFeature: function(feature) { |
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| 322 | if(!this.hover) { |
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| 323 | var selected = (OpenLayers.Util.indexOf( |
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| 324 | feature.layer.selectedFeatures, feature) > -1); |
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| 325 | if(selected) { |
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| 326 | if(this.toggleSelect()) { |
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| 327 | this.unselect(feature); |
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| 328 | } else if(!this.multipleSelect()) { |
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| 329 | this.unselectAll({except: feature}); |
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| 330 | } |
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| 331 | } else { |
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| 332 | if(!this.multipleSelect()) { |
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| 333 | this.unselectAll({except: feature}); |
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| 334 | } |
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| 335 | this.select(feature); |
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| 336 | } |
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| 337 | } |
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| 338 | }, |
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| 339 | |
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| 340 | /** |
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| 341 | * Method: multipleSelect |
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| 342 | * Allow for multiple selected features based on <multiple> property and |
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| 343 | * <multipleKey> event modifier. |
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| 344 | * |
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| 345 | * Returns: |
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| 346 | * {Boolean} Allow for multiple selected features. |
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| 347 | */ |
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| 348 | multipleSelect: function() { |
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| 349 | return this.multiple || (this.handlers.feature.evt && |
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| 350 | this.handlers.feature.evt[this.multipleKey]); |
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| 351 | }, |
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| 352 | |
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| 353 | /** |
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| 354 | * Method: toggleSelect |
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| 355 | * Event should toggle the selected state of a feature based on <toggle> |
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| 356 | * property and <toggleKey> event modifier. |
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| 357 | * |
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| 358 | * Returns: |
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| 359 | * {Boolean} Toggle the selected state of a feature. |
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| 360 | */ |
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| 361 | toggleSelect: function() { |
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| 362 | return this.toggle || (this.handlers.feature.evt && |
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| 363 | this.handlers.feature.evt[this.toggleKey]); |
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| 364 | }, |
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| 365 | |
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| 366 | /** |
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| 367 | * Method: clickoutFeature |
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| 368 | * Called on click outside a previously clicked (selected) feature. |
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| 369 | * Only responds if this.hover is false. |
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| 370 | * |
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| 371 | * Parameters: |
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| 372 | * feature - {<OpenLayers.Vector.Feature>} |
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| 373 | */ |
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| 374 | clickoutFeature: function(feature) { |
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| 375 | if(!this.hover && this.clickout) { |
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| 376 | this.unselectAll(); |
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| 377 | } |
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| 378 | }, |
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| 379 | |
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| 380 | /** |
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| 381 | * Method: overFeature |
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| 382 | * Called on over a feature. |
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| 383 | * Only responds if this.hover is true. |
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| 384 | * |
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| 385 | * Parameters: |
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| 386 | * feature - {<OpenLayers.Feature.Vector>} |
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| 387 | */ |
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| 388 | overFeature: function(feature) { |
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| 389 | var layer = feature.layer; |
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| 390 | if(this.hover) { |
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| 391 | if(this.highlightOnly) { |
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| 392 | this.highlight(feature); |
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| 393 | } else if(OpenLayers.Util.indexOf( |
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| 394 | layer.selectedFeatures, feature) == -1) { |
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| 395 | this.select(feature); |
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| 396 | } |
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| 397 | } |
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| 398 | }, |
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| 399 | |
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| 400 | /** |
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| 401 | * Method: outFeature |
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| 402 | * Called on out of a selected feature. |
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| 403 | * Only responds if this.hover is true. |
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| 404 | * |
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| 405 | * Parameters: |
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| 406 | * feature - {<OpenLayers.Feature.Vector>} |
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| 407 | */ |
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| 408 | outFeature: function(feature) { |
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| 409 | if(this.hover) { |
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| 410 | if(this.highlightOnly) { |
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| 411 | // we do nothing if we're not the last highlighter of the |
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| 412 | // feature |
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| 413 | if(feature._lastHighlighter == this.id) { |
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| 414 | // if another select control had highlighted the feature before |
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| 415 | // we did it ourself then we use that control to highlight the |
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| 416 | // feature as it was before we highlighted it, else we just |
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| 417 | // unhighlight it |
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| 418 | if(feature._prevHighlighter && |
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| 419 | feature._prevHighlighter != this.id) { |
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| 420 | delete feature._lastHighlighter; |
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| 421 | var control = this.map.getControl( |
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| 422 | feature._prevHighlighter); |
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| 423 | if(control) { |
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| 424 | control.highlight(feature); |
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| 425 | } |
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| 426 | } else { |
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| 427 | this.unhighlight(feature); |
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| 428 | } |
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| 429 | } |
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| 430 | } else { |
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| 431 | this.unselect(feature); |
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| 432 | } |
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| 433 | } |
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| 434 | }, |
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| 435 | |
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| 436 | /** |
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| 437 | * Method: highlight |
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| 438 | * Redraw feature with the select style. |
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| 439 | * |
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| 440 | * Parameters: |
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| 441 | * feature - {<OpenLayers.Feature.Vector>} |
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| 442 | */ |
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| 443 | highlight: function(feature) { |
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| 444 | var layer = feature.layer; |
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| 445 | var cont = this.events.triggerEvent("beforefeaturehighlighted", { |
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| 446 | feature : feature |
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| 447 | }); |
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| 448 | if(cont !== false) { |
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| 449 | feature._prevHighlighter = feature._lastHighlighter; |
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| 450 | feature._lastHighlighter = this.id; |
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| 451 | var style = this.selectStyle || this.renderIntent; |
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| 452 | layer.drawFeature(feature, style); |
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| 453 | this.events.triggerEvent("featurehighlighted", {feature : feature}); |
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| 454 | } |
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| 455 | }, |
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| 456 | |
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| 457 | /** |
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| 458 | * Method: unhighlight |
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| 459 | * Redraw feature with the "default" style |
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| 460 | * |
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| 461 | * Parameters: |
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| 462 | * feature - {<OpenLayers.Feature.Vector>} |
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| 463 | */ |
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| 464 | unhighlight: function(feature) { |
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| 465 | var layer = feature.layer; |
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| 466 | feature._lastHighlighter = feature._prevHighlighter; |
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| 467 | delete feature._prevHighlighter; |
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| 468 | layer.drawFeature(feature, feature.style || feature.layer.style || |
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| 469 | "default"); |
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| 470 | this.events.triggerEvent("featureunhighlighted", {feature : feature}); |
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| 471 | }, |
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| 472 | |
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| 473 | /** |
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| 474 | * Method: select |
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| 475 | * Add feature to the layer's selectedFeature array, render the feature as |
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| 476 | * selected, and call the onSelect function. |
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| 477 | * |
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| 478 | * Parameters: |
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| 479 | * feature - {<OpenLayers.Feature.Vector>} |
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| 480 | */ |
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| 481 | select: function(feature) { |
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| 482 | var cont = this.onBeforeSelect.call(this.scope, feature); |
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| 483 | var layer = feature.layer; |
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| 484 | if(cont !== false) { |
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| 485 | cont = layer.events.triggerEvent("beforefeatureselected", { |
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| 486 | feature: feature |
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| 487 | }); |
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| 488 | if(cont !== false) { |
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| 489 | layer.selectedFeatures.push(feature); |
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| 490 | this.highlight(feature); |
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| 491 | // if the feature handler isn't involved in the feature |
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| 492 | // selection (because the box handler is used or the |
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| 493 | // feature is selected programatically) we fake the |
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| 494 | // feature handler to allow unselecting on click |
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| 495 | if(!this.handlers.feature.lastFeature) { |
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| 496 | this.handlers.feature.lastFeature = layer.selectedFeatures[0]; |
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| 497 | } |
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| 498 | layer.events.triggerEvent("featureselected", {feature: feature}); |
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| 499 | this.onSelect.call(this.scope, feature); |
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| 500 | } |
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| 501 | } |
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| 502 | }, |
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| 503 | |
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| 504 | /** |
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| 505 | * Method: unselect |
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| 506 | * Remove feature from the layer's selectedFeature array, render the feature as |
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| 507 | * normal, and call the onUnselect function. |
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| 508 | * |
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| 509 | * Parameters: |
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| 510 | * feature - {<OpenLayers.Feature.Vector>} |
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| 511 | */ |
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| 512 | unselect: function(feature) { |
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| 513 | var layer = feature.layer; |
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| 514 | // Store feature style for restoration later |
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| 515 | this.unhighlight(feature); |
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| 516 | OpenLayers.Util.removeItem(layer.selectedFeatures, feature); |
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| 517 | layer.events.triggerEvent("featureunselected", {feature: feature}); |
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| 518 | this.onUnselect.call(this.scope, feature); |
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| 519 | }, |
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| 520 | |
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| 521 | /** |
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| 522 | * Method: selectBox |
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| 523 | * Callback from the handlers.box set up when <box> selection is true |
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| 524 | * on. |
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| 525 | * |
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| 526 | * Parameters: |
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| 527 | * position - {<OpenLayers.Bounds> || <OpenLayers.Pixel> } |
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| 528 | */ |
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| 529 | selectBox: function(position) { |
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| 530 | if (position instanceof OpenLayers.Bounds) { |
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| 531 | var minXY = this.map.getLonLatFromPixel( |
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| 532 | new OpenLayers.Pixel(position.left, position.bottom) |
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| 533 | ); |
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| 534 | var maxXY = this.map.getLonLatFromPixel( |
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| 535 | new OpenLayers.Pixel(position.right, position.top) |
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| 536 | ); |
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| 537 | var bounds = new OpenLayers.Bounds( |
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| 538 | minXY.lon, minXY.lat, maxXY.lon, maxXY.lat |
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| 539 | ); |
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| 540 | |
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| 541 | // if multiple is false, first deselect currently selected features |
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| 542 | if (!this.multipleSelect()) { |
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| 543 | this.unselectAll(); |
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| 544 | } |
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| 545 | |
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| 546 | // because we're using a box, we consider we want multiple selection |
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| 547 | var prevMultiple = this.multiple; |
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| 548 | this.multiple = true; |
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| 549 | var layers = this.layers || [this.layer]; |
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| 550 | var layer; |
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| 551 | for(var l=0; l<layers.length; ++l) { |
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| 552 | layer = layers[l]; |
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| 553 | for(var i=0, len = layer.features.length; i<len; ++i) { |
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| 554 | var feature = layer.features[i]; |
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| 555 | // check if the feature is displayed |
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| 556 | if (!feature.getVisibility()) { |
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| 557 | continue; |
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| 558 | } |
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| 559 | |
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| 560 | if (this.geometryTypes == null || OpenLayers.Util.indexOf( |
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| 561 | this.geometryTypes, feature.geometry.CLASS_NAME) > -1) { |
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| 562 | if (bounds.toGeometry().intersects(feature.geometry)) { |
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| 563 | if (OpenLayers.Util.indexOf(layer.selectedFeatures, feature) == -1) { |
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| 564 | this.select(feature); |
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| 565 | } |
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| 566 | } |
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| 567 | } |
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| 568 | } |
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| 569 | } |
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| 570 | this.multiple = prevMultiple; |
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| 571 | } |
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| 572 | }, |
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| 573 | |
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| 574 | /** |
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| 575 | * Method: setMap |
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| 576 | * Set the map property for the control. |
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| 577 | * |
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| 578 | * Parameters: |
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| 579 | * map - {<OpenLayers.Map>} |
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| 580 | */ |
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| 581 | setMap: function(map) { |
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| 582 | this.handlers.feature.setMap(map); |
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| 583 | if (this.box) { |
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| 584 | this.handlers.box.setMap(map); |
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| 585 | } |
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| 586 | OpenLayers.Control.prototype.setMap.apply(this, arguments); |
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| 587 | }, |
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| 588 | |
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| 589 | /** |
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| 590 | * APIMethod: setLayer |
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| 591 | * Attach a new layer to the control, overriding any existing layers. |
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| 592 | * |
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| 593 | * Parameters: |
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| 594 | * layers - Array of {<OpenLayers.Layer.Vector>} or a single |
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| 595 | * {<OpenLayers.Layer.Vector>} |
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| 596 | */ |
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| 597 | setLayer: function(layers) { |
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| 598 | var isActive = this.active; |
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| 599 | this.unselectAll(); |
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| 600 | this.deactivate(); |
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| 601 | if(this.layers) { |
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| 602 | this.layer.destroy(); |
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| 603 | this.layers = null; |
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| 604 | } |
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| 605 | this.initLayer(layers); |
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| 606 | this.handlers.feature.layer = this.layer; |
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| 607 | if (isActive) { |
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| 608 | this.activate(); |
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| 609 | } |
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| 610 | }, |
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| 611 | |
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| 612 | CLASS_NAME: "OpenLayers.Control.SelectFeature" |
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| 613 | }); |
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