1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Control.js |
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8 | * @requires OpenLayers/Handler/Click.js |
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9 | * @requires OpenLayers/Handler/Box.js |
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10 | * @requires OpenLayers/Handler/Hover.js |
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11 | * @requires OpenLayers/Filter/Spatial.js |
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12 | */ |
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13 | |
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14 | /** |
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15 | * Class: OpenLayers.Control.GetFeature |
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16 | * Gets vector features for locations underneath the mouse cursor. Can be |
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17 | * configured to act on click, hover or dragged boxes. Uses an |
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18 | * <OpenLayers.Protocol> that supports spatial filters to retrieve |
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19 | * features from a server and fires events that notify applications of the |
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20 | * selected features. |
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21 | * |
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22 | * Inherits from: |
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23 | * - <OpenLayers.Control> |
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24 | */ |
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25 | OpenLayers.Control.GetFeature = OpenLayers.Class(OpenLayers.Control, { |
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26 | |
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27 | /** |
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28 | * APIProperty: protocol |
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29 | * {<OpenLayers.Protocol>} Required. The protocol used for fetching |
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30 | * features. |
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31 | */ |
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32 | protocol: null, |
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33 | |
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34 | /** |
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35 | * APIProperty: 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 | * APIProperty: 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 | * Property: modifiers |
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50 | * {Object} The event modifiers to use, according to the current event |
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51 | * being handled by this control's handlers |
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52 | */ |
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53 | modifiers: null, |
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54 | |
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55 | /** |
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56 | * APIProperty: multiple |
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57 | * {Boolean} Allow selection of multiple geometries. Default is false. |
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58 | */ |
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59 | multiple: false, |
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60 | |
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61 | /** |
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62 | * APIProperty: click |
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63 | * {Boolean} Use a click handler for selecting/unselecting features. If |
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64 | * both <click> and <box> are set to true, the click handler takes |
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65 | * precedence over the box handler if a box with zero extent was |
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66 | * selected. Default is true. |
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67 | */ |
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68 | click: true, |
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69 | |
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70 | /** |
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71 | * APIProperty: single |
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72 | * {Boolean} Tells whether select by click should select a single |
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73 | * feature. If set to false, all matching features are selected. |
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74 | * If set to true, only the best matching feature is selected. |
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75 | * This option has an effect only of the <click> option is set |
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76 | * to true. Default is true. |
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77 | */ |
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78 | single: true, |
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79 | |
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80 | /** |
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81 | * APIProperty: clickout |
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82 | * {Boolean} Unselect features when clicking outside any feature. |
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83 | * Applies only if <click> is true. Default is true. |
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84 | */ |
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85 | clickout: true, |
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86 | |
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87 | /** |
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88 | * APIProperty: toggle |
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89 | * {Boolean} Unselect a selected feature on click. Applies only if |
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90 | * <click> is true. Default is false. |
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91 | */ |
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92 | toggle: false, |
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93 | |
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94 | /** |
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95 | * APIProperty: clickTolerance |
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96 | * {Integer} Tolerance for the filter query in pixels. This has the |
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97 | * same effect as the tolerance parameter on WMS GetFeatureInfo |
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98 | * requests. Will be ignored for box selections. Applies only if |
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99 | * <click> or <hover> is true. Default is 5. Note that this not |
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100 | * only affects requests on click, but also on hover. |
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101 | */ |
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102 | clickTolerance: 5, |
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103 | |
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104 | /** |
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105 | * APIProperty: hover |
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106 | * {Boolean} Send feature requests on mouse moves. Default is false. |
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107 | */ |
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108 | hover: false, |
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109 | |
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110 | /** |
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111 | * APIProperty: box |
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112 | * {Boolean} Allow feature selection by drawing a box. If set to |
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113 | * true set <click> to false to disable the click handler and |
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114 | * rely on the box handler only, even for "zero extent" boxes. |
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115 | * See the description of the <click> option for additional |
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116 | * information. Default is false. |
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117 | */ |
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118 | box: false, |
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119 | |
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120 | /** |
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121 | * APIProperty: maxFeatures |
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122 | * {Integer} Maximum number of features to return from a query in single mode |
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123 | * if supported by the <protocol>. This set of features is then used to |
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124 | * determine the best match client-side. Default is 10. |
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125 | */ |
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126 | maxFeatures: 10, |
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127 | |
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128 | /** |
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129 | * Property: features |
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130 | * {Object} Hash of {<OpenLayers.Feature.Vector>}, keyed by fid, holding |
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131 | * the currently selected features |
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132 | */ |
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133 | features: null, |
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134 | |
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135 | /** |
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136 | * Proeprty: hoverFeature |
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137 | * {<OpenLayers.Feature.Vector>} The feature currently selected by the |
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138 | * hover handler |
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139 | */ |
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140 | hoverFeature: null, |
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141 | |
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142 | /** |
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143 | * APIProperty: handlerOptions |
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144 | * {Object} Additional options for the handlers used by this control. This |
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145 | * is a hash with the keys "click", "box" and "hover". |
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146 | */ |
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147 | handlerOptions: null, |
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148 | |
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149 | /** |
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150 | * Property: handlers |
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151 | * {Object} Object with references to multiple <OpenLayers.Handler> |
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152 | * instances. |
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153 | */ |
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154 | handlers: null, |
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155 | |
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156 | /** |
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157 | * Property: hoverResponse |
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158 | * {<OpenLayers.Protocol.Response>} The response object associated with |
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159 | * the currently running hover request (if any). |
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160 | */ |
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161 | hoverResponse: null, |
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162 | |
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163 | /** |
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164 | * Property: filterType |
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165 | * {<String>} The type of filter to use when sending off a request. |
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166 | * Possible values: |
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167 | * OpenLayers.Filter.Spatial.<BBOX|INTERSECTS|WITHIN|CONTAINS> |
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168 | * Defaults to: OpenLayers.Filter.Spatial.BBOX |
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169 | */ |
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170 | filterType: OpenLayers.Filter.Spatial.BBOX, |
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171 | |
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172 | /** |
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173 | * Constant: EVENT_TYPES |
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174 | * |
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175 | * Supported event types: |
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176 | * beforefeatureselected - Triggered when <click> is true before a |
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177 | * feature is selected. The event object has a feature property with |
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178 | * the feature about to select |
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179 | * featureselected - Triggered when <click> is true and a feature is |
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180 | * selected. The event object has a feature property with the |
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181 | * selected feature |
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182 | * beforefeaturesselected - Triggered when <click> is true before a |
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183 | * set of features is selected. The event object is an array of |
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184 | * feature properties with the features about to be selected. |
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185 | * Return false after receiving this event to discontinue processing |
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186 | * of all featureselected events and the featuresselected event. |
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187 | * featuresselected - Triggered when <click> is true and a set of |
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188 | * features is selected. The event object is an array of feature |
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189 | * properties of the selected features |
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190 | * featureunselected - Triggered when <click> is true and a feature is |
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191 | * unselected. The event object has a feature property with the |
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192 | * unselected feature |
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193 | * clickout - Triggered when when <click> is true and no feature was |
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194 | * selected. |
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195 | * hoverfeature - Triggered when <hover> is true and the mouse has |
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196 | * stopped over a feature |
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197 | * outfeature - Triggered when <hover> is true and the mouse moves |
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198 | * moved away from a hover-selected feature |
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199 | */ |
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200 | EVENT_TYPES: ["featureselected", "featuresselected", "featureunselected", |
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201 | "clickout", "beforefeatureselected", "beforefeaturesselected", |
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202 | "hoverfeature", "outfeature"], |
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203 | |
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204 | /** |
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205 | * Constructor: OpenLayers.Control.GetFeature |
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206 | * Create a new control for fetching remote features. |
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207 | * |
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208 | * Parameters: |
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209 | * options - {Object} A configuration object which at least has to contain |
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210 | * a <protocol> property |
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211 | */ |
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212 | initialize: function(options) { |
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213 | // concatenate events specific to vector with those from the base |
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214 | this.EVENT_TYPES = |
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215 | OpenLayers.Control.GetFeature.prototype.EVENT_TYPES.concat( |
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216 | OpenLayers.Control.prototype.EVENT_TYPES |
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217 | ); |
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218 | |
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219 | options.handlerOptions = options.handlerOptions || {}; |
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220 | |
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221 | OpenLayers.Control.prototype.initialize.apply(this, [options]); |
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222 | |
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223 | this.features = {}; |
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224 | |
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225 | this.handlers = {}; |
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226 | |
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227 | if(this.click) { |
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228 | this.handlers.click = new OpenLayers.Handler.Click(this, |
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229 | {click: this.selectClick}, this.handlerOptions.click || {}); |
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230 | } |
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231 | |
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232 | if(this.box) { |
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233 | this.handlers.box = new OpenLayers.Handler.Box( |
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234 | this, {done: this.selectBox}, |
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235 | OpenLayers.Util.extend(this.handlerOptions.box, { |
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236 | boxDivClassName: "olHandlerBoxSelectFeature" |
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237 | }) |
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238 | ); |
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239 | } |
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240 | |
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241 | if(this.hover) { |
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242 | this.handlers.hover = new OpenLayers.Handler.Hover( |
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243 | this, {'move': this.cancelHover, 'pause': this.selectHover}, |
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244 | OpenLayers.Util.extend(this.handlerOptions.hover, { |
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245 | 'delay': 250 |
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246 | }) |
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247 | ); |
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248 | } |
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249 | }, |
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250 | |
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251 | /** |
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252 | * Method: activate |
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253 | * Activates the control. |
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254 | * |
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255 | * Returns: |
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256 | * {Boolean} The control was effectively activated. |
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257 | */ |
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258 | activate: function () { |
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259 | if (!this.active) { |
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260 | for(var i in this.handlers) { |
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261 | this.handlers[i].activate(); |
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262 | } |
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263 | } |
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264 | return OpenLayers.Control.prototype.activate.apply( |
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265 | this, arguments |
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266 | ); |
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267 | }, |
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268 | |
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269 | /** |
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270 | * Method: deactivate |
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271 | * Deactivates the control. |
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272 | * |
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273 | * Returns: |
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274 | * {Boolean} The control was effectively deactivated. |
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275 | */ |
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276 | deactivate: function () { |
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277 | if (this.active) { |
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278 | for(var i in this.handlers) { |
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279 | this.handlers[i].deactivate(); |
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280 | } |
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281 | } |
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282 | return OpenLayers.Control.prototype.deactivate.apply( |
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283 | this, arguments |
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284 | ); |
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285 | }, |
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286 | |
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287 | /** |
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288 | * Method: selectClick |
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289 | * Called on click |
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290 | * |
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291 | * Parameters: |
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292 | * evt - {<OpenLayers.Event>} |
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293 | */ |
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294 | selectClick: function(evt) { |
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295 | var bounds = this.pixelToBounds(evt.xy); |
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296 | |
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297 | this.setModifiers(evt); |
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298 | this.request(bounds, {single: this.single}); |
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299 | }, |
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300 | |
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301 | /** |
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302 | * Method: selectBox |
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303 | * Callback from the handlers.box set up when <box> selection is on |
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304 | * |
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305 | * Parameters: |
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306 | * position - {<OpenLayers.Bounds>} |
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307 | */ |
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308 | selectBox: function(position) { |
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309 | var bounds; |
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310 | if (position instanceof OpenLayers.Bounds) { |
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311 | var minXY = this.map.getLonLatFromPixel( |
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312 | new OpenLayers.Pixel(position.left, position.bottom) |
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313 | ); |
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314 | var maxXY = this.map.getLonLatFromPixel( |
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315 | new OpenLayers.Pixel(position.right, position.top) |
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316 | ); |
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317 | bounds = new OpenLayers.Bounds( |
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318 | minXY.lon, minXY.lat, maxXY.lon, maxXY.lat |
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319 | ); |
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320 | |
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321 | } else { |
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322 | if(this.click) { |
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323 | // box without extent - let the click handler take care of it |
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324 | return; |
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325 | } |
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326 | bounds = this.pixelToBounds(position); |
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327 | } |
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328 | this.setModifiers(this.handlers.box.dragHandler.evt); |
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329 | this.request(bounds); |
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330 | }, |
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331 | |
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332 | /** |
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333 | * Method selectHover |
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334 | * Callback from the handlers.hover set up when <hover> selection is on |
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335 | * |
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336 | * Parameters: |
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337 | * evt {Object} - event object with an xy property |
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338 | */ |
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339 | selectHover: function(evt) { |
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340 | var bounds = this.pixelToBounds(evt.xy); |
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341 | this.request(bounds, {single: true, hover: true}); |
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342 | }, |
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343 | |
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344 | /** |
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345 | * Method: cancelHover |
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346 | * Callback from the handlers.hover set up when <hover> selection is on |
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347 | */ |
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348 | cancelHover: function() { |
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349 | if (this.hoverResponse) { |
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350 | this.protocol.abort(this.hoverResponse); |
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351 | this.hoverResponse = null; |
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352 | |
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353 | OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait"); |
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354 | } |
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355 | }, |
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356 | |
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357 | /** |
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358 | * Method: request |
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359 | * Sends a GetFeature request to the WFS |
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360 | * |
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361 | * Parameters: |
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362 | * bounds - {<OpenLayers.Bounds>} bounds for the request's BBOX filter |
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363 | * options - {Object} additional options for this method. |
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364 | * |
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365 | * Supported options include: |
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366 | * single - {Boolean} A single feature should be returned. |
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367 | * Note that this will be ignored if the protocol does not |
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368 | * return the geometries of the features. |
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369 | * hover - {Boolean} Do the request for the hover handler. |
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370 | */ |
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371 | request: function(bounds, options) { |
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372 | options = options || {}; |
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373 | var filter = new OpenLayers.Filter.Spatial({ |
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374 | type: this.filterType, |
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375 | value: bounds |
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376 | }); |
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377 | |
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378 | // Set the cursor to "wait" to tell the user we're working. |
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379 | OpenLayers.Element.addClass(this.map.viewPortDiv, "olCursorWait"); |
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380 | |
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381 | var response = this.protocol.read({ |
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382 | maxFeatures: options.single == true ? this.maxFeatures : undefined, |
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383 | filter: filter, |
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384 | callback: function(result) { |
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385 | if(result.success()) { |
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386 | if(result.features.length) { |
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387 | if(options.single == true) { |
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388 | this.selectBestFeature(result.features, |
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389 | bounds.getCenterLonLat(), options); |
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390 | } else { |
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391 | this.select(result.features); |
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392 | } |
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393 | } else if(options.hover) { |
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394 | this.hoverSelect(); |
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395 | } else { |
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396 | this.events.triggerEvent("clickout"); |
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397 | if(this.clickout) { |
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398 | this.unselectAll(); |
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399 | } |
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400 | } |
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401 | } |
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402 | // Reset the cursor. |
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403 | OpenLayers.Element.removeClass(this.map.viewPortDiv, "olCursorWait"); |
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404 | }, |
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405 | scope: this |
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406 | }); |
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407 | if(options.hover == true) { |
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408 | this.hoverResponse = response; |
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409 | } |
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410 | }, |
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411 | |
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412 | /** |
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413 | * Method: selectBestFeature |
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414 | * Selects the feature from an array of features that is the best match |
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415 | * for the click position. |
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416 | * |
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417 | * Parameters: |
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418 | * features - {Array(<OpenLayers.Feature.Vector>)} |
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419 | * clickPosition - {<OpenLayers.LonLat>} |
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420 | * options - {Object} additional options for this method |
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421 | * |
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422 | * Supported options include: |
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423 | * hover - {Boolean} Do the selection for the hover handler. |
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424 | */ |
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425 | selectBestFeature: function(features, clickPosition, options) { |
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426 | options = options || {}; |
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427 | if(features.length) { |
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428 | var point = new OpenLayers.Geometry.Point(clickPosition.lon, |
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429 | clickPosition.lat); |
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430 | var feature, resultFeature, dist; |
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431 | var minDist = Number.MAX_VALUE; |
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432 | for(var i=0; i<features.length; ++i) { |
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433 | feature = features[i]; |
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434 | if(feature.geometry) { |
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435 | dist = point.distanceTo(feature.geometry, {edge: false}); |
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436 | if(dist < minDist) { |
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437 | minDist = dist; |
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438 | resultFeature = feature; |
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439 | if(minDist == 0) { |
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440 | break; |
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441 | } |
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442 | } |
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443 | } |
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444 | } |
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445 | |
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446 | if(options.hover == true) { |
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447 | this.hoverSelect(resultFeature); |
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448 | } else { |
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449 | this.select(resultFeature || features); |
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450 | } |
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451 | } |
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452 | }, |
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453 | |
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454 | /** |
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455 | * Method: setModifiers |
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456 | * Sets the multiple and toggle modifiers according to the current event |
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457 | * |
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458 | * Parameters: |
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459 | * evt {<OpenLayers.Event>} |
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460 | */ |
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461 | setModifiers: function(evt) { |
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462 | this.modifiers = { |
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463 | multiple: this.multiple || (this.multipleKey && evt[this.multipleKey]), |
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464 | toggle: this.toggle || (this.toggleKey && evt[this.toggleKey]) |
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465 | }; |
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466 | }, |
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467 | |
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468 | /** |
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469 | * Method: select |
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470 | * Add feature to the hash of selected features and trigger the |
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471 | * featureselected and featuresselected events. |
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472 | * |
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473 | * Parameters: |
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474 | * features - {<OpenLayers.Feature.Vector>} or an array of features |
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475 | */ |
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476 | select: function(features) { |
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477 | if(!this.modifiers.multiple && !this.modifiers.toggle) { |
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478 | this.unselectAll(); |
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479 | } |
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480 | if(!(features instanceof Array)) { |
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481 | features = [features]; |
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482 | } |
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483 | |
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484 | var cont = this.events.triggerEvent("beforefeaturesselected", { |
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485 | features: features |
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486 | }); |
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487 | if(cont !== false) { |
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488 | var selectedFeatures = []; |
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489 | var feature; |
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490 | for(var i=0, len=features.length; i<len; ++i) { |
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491 | feature = features[i]; |
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492 | if(this.features[feature.fid || feature.id]) { |
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493 | if(this.modifiers.toggle) { |
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494 | this.unselect(this.features[feature.fid || feature.id]); |
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495 | } |
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496 | } else { |
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497 | cont = this.events.triggerEvent("beforefeatureselected", { |
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498 | feature: feature |
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499 | }); |
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500 | if(cont !== false) { |
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501 | this.features[feature.fid || feature.id] = feature; |
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502 | selectedFeatures.push(feature); |
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503 | |
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504 | this.events.triggerEvent("featureselected", |
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505 | {feature: feature}); |
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506 | } |
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507 | } |
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508 | } |
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509 | this.events.triggerEvent("featuresselected", { |
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510 | features: selectedFeatures |
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511 | }); |
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512 | } |
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513 | }, |
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514 | |
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515 | /** |
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516 | * Method: hoverSelect |
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517 | * Sets/unsets the <hoverFeature> |
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518 | * |
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519 | * Parameters: |
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520 | * feature - {<OpenLayers.Feature.Vector>} the feature to hover-select. |
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521 | * If none is provided, the current <hoverFeature> will be nulled and |
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522 | * the outfeature event will be triggered. |
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523 | */ |
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524 | hoverSelect: function(feature) { |
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525 | var fid = feature ? feature.fid || feature.id : null; |
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526 | var hfid = this.hoverFeature ? |
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527 | this.hoverFeature.fid || this.hoverFeature.id : null; |
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528 | |
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529 | if(hfid && hfid != fid) { |
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530 | this.events.triggerEvent("outfeature", |
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531 | {feature: this.hoverFeature}); |
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532 | this.hoverFeature = null; |
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533 | } |
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534 | if(fid && fid != hfid) { |
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535 | this.events.triggerEvent("hoverfeature", {feature: feature}); |
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536 | this.hoverFeature = feature; |
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537 | } |
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538 | }, |
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539 | |
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540 | /** |
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541 | * Method: unselect |
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542 | * Remove feature from the hash of selected features and trigger the |
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543 | * featureunselected event. |
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544 | * |
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545 | * Parameters: |
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546 | * feature - {<OpenLayers.Feature.Vector>} |
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547 | */ |
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548 | unselect: function(feature) { |
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549 | delete this.features[feature.fid || feature.id]; |
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550 | this.events.triggerEvent("featureunselected", {feature: feature}); |
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551 | }, |
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552 | |
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553 | /** |
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554 | * Method: unselectAll |
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555 | * Unselect all selected features. |
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556 | */ |
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557 | unselectAll: function() { |
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558 | // we'll want an option to supress notification here |
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559 | for(var fid in this.features) { |
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560 | this.unselect(this.features[fid]); |
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561 | } |
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562 | }, |
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563 | |
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564 | /** |
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565 | * Method: setMap |
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566 | * Set the map property for the control. |
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567 | * |
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568 | * Parameters: |
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569 | * map - {<OpenLayers.Map>} |
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570 | */ |
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571 | setMap: function(map) { |
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572 | for(var i in this.handlers) { |
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573 | this.handlers[i].setMap(map); |
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574 | } |
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575 | OpenLayers.Control.prototype.setMap.apply(this, arguments); |
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576 | }, |
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577 | |
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578 | /** |
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579 | * Method: pixelToBounds |
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580 | * Takes a pixel as argument and creates bounds after adding the |
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581 | * <clickTolerance>. |
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582 | * |
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583 | * Parameters: |
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584 | * pixel - {<OpenLayers.Pixel>} |
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585 | */ |
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586 | pixelToBounds: function(pixel) { |
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587 | var llPx = pixel.add(-this.clickTolerance/2, this.clickTolerance/2); |
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588 | var urPx = pixel.add(this.clickTolerance/2, -this.clickTolerance/2); |
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589 | var ll = this.map.getLonLatFromPixel(llPx); |
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590 | var ur = this.map.getLonLatFromPixel(urPx); |
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591 | return new OpenLayers.Bounds(ll.lon, ll.lat, ur.lon, ur.lat); |
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592 | }, |
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593 | |
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594 | CLASS_NAME: "OpenLayers.Control.GetFeature" |
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595 | }); |
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