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 | * |
---|
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 | * |
---|
593 | * Parameters: |
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594 | * layers - Array of {<OpenLayers.Layer.Vector>} or a single |
---|
595 | * {<OpenLayers.Layer.Vector>} |
---|
596 | */ |
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597 | setLayer: function(layers) { |
---|
598 | var isActive = this.active; |
---|
599 | this.unselectAll(); |
---|
600 | this.deactivate(); |
---|
601 | if(this.layers) { |
---|
602 | this.layer.destroy(); |
---|
603 | this.layers = null; |
---|
604 | } |
---|
605 | this.initLayer(layers); |
---|
606 | this.handlers.feature.layer = this.layer; |
---|
607 | if (isActive) { |
---|
608 | this.activate(); |
---|
609 | } |
---|
610 | }, |
---|
611 | |
---|
612 | CLASS_NAME: "OpenLayers.Control.SelectFeature" |
---|
613 | }); |
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