1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Control.js |
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8 | */ |
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9 | |
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10 | /** |
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11 | * Class: OpenLayers.Control.LayerSwitcher |
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12 | * The LayerSwitcher control displays a table of contents for the map. This |
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13 | * allows the user interface to switch between BaseLasyers and to show or hide |
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14 | * Overlays. By default the switcher is shown minimized on the right edge of |
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15 | * the map, the user may expand it by clicking on the handle. |
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16 | * |
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17 | * To create the LayerSwitcher outside of the map, pass the Id of a html div |
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18 | * as the first argument to the constructor. |
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19 | * |
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20 | * Inherits from: |
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21 | * - <OpenLayers.Control> |
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22 | */ |
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23 | OpenLayers.Control.LayerSwitcher = |
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24 | OpenLayers.Class(OpenLayers.Control, { |
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25 | |
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26 | /** |
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27 | * APIProperty: roundedCorner |
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28 | * {Boolean} If true the Rico library is used for rounding the corners |
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29 | * of the layer switcher div, defaults to true. |
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30 | */ |
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31 | roundedCorner: true, |
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32 | |
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33 | /** |
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34 | * APIProperty: roundedCornerColor |
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35 | * {String} The color of the rounded corners, only applies if roundedCorner |
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36 | * is true, defaults to "darkblue". |
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37 | */ |
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38 | roundedCornerColor: "darkblue", |
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39 | |
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40 | /** |
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41 | * Property: layerStates |
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42 | * {Array(Object)} Basically a copy of the "state" of the map's layers |
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43 | * the last time the control was drawn. We have this in order to avoid |
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44 | * unnecessarily redrawing the control. |
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45 | */ |
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46 | layerStates: null, |
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47 | |
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48 | |
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49 | // DOM Elements |
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50 | |
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51 | /** |
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52 | * Property: layersDiv |
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53 | * {DOMElement} |
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54 | */ |
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55 | layersDiv: null, |
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56 | |
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57 | /** |
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58 | * Property: baseLayersDiv |
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59 | * {DOMElement} |
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60 | */ |
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61 | baseLayersDiv: null, |
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62 | |
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63 | /** |
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64 | * Property: baseLayers |
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65 | * {Array(<OpenLayers.Layer>)} |
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66 | */ |
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67 | baseLayers: null, |
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68 | |
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69 | |
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70 | /** |
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71 | * Property: dataLbl |
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72 | * {DOMElement} |
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73 | */ |
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74 | dataLbl: null, |
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75 | |
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76 | /** |
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77 | * Property: dataLayersDiv |
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78 | * {DOMElement} |
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79 | */ |
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80 | dataLayersDiv: null, |
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81 | |
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82 | /** |
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83 | * Property: dataLayers |
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84 | * {Array(<OpenLayers.Layer>)} |
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85 | */ |
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86 | dataLayers: null, |
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87 | |
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88 | |
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89 | /** |
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90 | * Property: minimizeDiv |
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91 | * {DOMElement} |
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92 | */ |
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93 | minimizeDiv: null, |
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94 | |
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95 | /** |
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96 | * Property: maximizeDiv |
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97 | * {DOMElement} |
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98 | */ |
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99 | maximizeDiv: null, |
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100 | |
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101 | /** |
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102 | * APIProperty: ascending |
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103 | * {Boolean} |
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104 | */ |
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105 | ascending: true, |
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106 | |
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107 | /** |
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108 | * Constructor: OpenLayers.Control.LayerSwitcher |
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109 | * |
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110 | * Parameters: |
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111 | * options - {Object} |
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112 | */ |
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113 | initialize: function(options) { |
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114 | OpenLayers.Control.prototype.initialize.apply(this, arguments); |
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115 | this.layerStates = []; |
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116 | }, |
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117 | |
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118 | /** |
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119 | * APIMethod: destroy |
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120 | */ |
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121 | destroy: function() { |
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122 | |
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123 | OpenLayers.Event.stopObservingElement(this.div); |
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124 | |
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125 | OpenLayers.Event.stopObservingElement(this.minimizeDiv); |
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126 | OpenLayers.Event.stopObservingElement(this.maximizeDiv); |
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127 | |
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128 | //clear out layers info and unregister their events |
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129 | this.clearLayersArray("base"); |
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130 | this.clearLayersArray("data"); |
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131 | |
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132 | this.map.events.un({ |
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133 | "addlayer": this.redraw, |
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134 | "changelayer": this.redraw, |
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135 | "removelayer": this.redraw, |
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136 | "changebaselayer": this.redraw, |
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137 | scope: this |
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138 | }); |
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139 | |
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140 | OpenLayers.Control.prototype.destroy.apply(this, arguments); |
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141 | }, |
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142 | |
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143 | /** |
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144 | * Method: setMap |
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145 | * |
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146 | * Properties: |
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147 | * map - {<OpenLayers.Map>} |
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148 | */ |
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149 | setMap: function(map) { |
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150 | OpenLayers.Control.prototype.setMap.apply(this, arguments); |
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151 | |
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152 | this.map.events.on({ |
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153 | "addlayer": this.redraw, |
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154 | "changelayer": this.redraw, |
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155 | "removelayer": this.redraw, |
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156 | "changebaselayer": this.redraw, |
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157 | scope: this |
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158 | }); |
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159 | }, |
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160 | |
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161 | /** |
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162 | * Method: draw |
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163 | * |
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164 | * Returns: |
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165 | * {DOMElement} A reference to the DIV DOMElement containing the |
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166 | * switcher tabs. |
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167 | */ |
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168 | draw: function() { |
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169 | OpenLayers.Control.prototype.draw.apply(this); |
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170 | |
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171 | // create layout divs |
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172 | this.loadContents(); |
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173 | |
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174 | // set mode to minimize |
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175 | if(!this.outsideViewport) { |
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176 | this.minimizeControl(); |
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177 | } |
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178 | |
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179 | // populate div with current info |
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180 | this.redraw(); |
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181 | |
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182 | return this.div; |
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183 | }, |
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184 | |
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185 | /** |
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186 | * Method: clearLayersArray |
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187 | * User specifies either "base" or "data". we then clear all the |
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188 | * corresponding listeners, the div, and reinitialize a new array. |
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189 | * |
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190 | * Parameters: |
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191 | * layersType - {String} |
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192 | */ |
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193 | clearLayersArray: function(layersType) { |
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194 | var layers = this[layersType + "Layers"]; |
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195 | if (layers) { |
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196 | for(var i=0, len=layers.length; i<len ; i++) { |
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197 | var layer = layers[i]; |
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198 | OpenLayers.Event.stopObservingElement(layer.inputElem); |
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199 | OpenLayers.Event.stopObservingElement(layer.labelSpan); |
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200 | } |
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201 | } |
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202 | this[layersType + "LayersDiv"].innerHTML = ""; |
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203 | this[layersType + "Layers"] = []; |
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204 | }, |
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205 | |
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206 | |
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207 | /** |
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208 | * Method: checkRedraw |
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209 | * Checks if the layer state has changed since the last redraw() call. |
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210 | * |
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211 | * Returns: |
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212 | * {Boolean} The layer state changed since the last redraw() call. |
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213 | */ |
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214 | checkRedraw: function() { |
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215 | var redraw = false; |
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216 | if ( !this.layerStates.length || |
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217 | (this.map.layers.length != this.layerStates.length) ) { |
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218 | redraw = true; |
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219 | } else { |
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220 | for (var i=0, len=this.layerStates.length; i<len; i++) { |
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221 | var layerState = this.layerStates[i]; |
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222 | var layer = this.map.layers[i]; |
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223 | if ( (layerState.name != layer.name) || |
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224 | (layerState.inRange != layer.inRange) || |
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225 | (layerState.id != layer.id) || |
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226 | (layerState.visibility != layer.visibility) ) { |
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227 | redraw = true; |
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228 | break; |
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229 | } |
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230 | } |
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231 | } |
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232 | return redraw; |
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233 | }, |
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234 | |
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235 | /** |
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236 | * Method: redraw |
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237 | * Goes through and takes the current state of the Map and rebuilds the |
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238 | * control to display that state. Groups base layers into a |
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239 | * radio-button group and lists each data layer with a checkbox. |
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240 | * |
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241 | * Returns: |
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242 | * {DOMElement} A reference to the DIV DOMElement containing the control |
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243 | */ |
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244 | redraw: function() { |
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245 | //if the state hasn't changed since last redraw, no need |
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246 | // to do anything. Just return the existing div. |
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247 | if (!this.checkRedraw()) { |
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248 | return this.div; |
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249 | } |
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250 | |
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251 | //clear out previous layers |
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252 | this.clearLayersArray("base"); |
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253 | this.clearLayersArray("data"); |
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254 | |
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255 | var containsOverlays = false; |
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256 | var containsBaseLayers = false; |
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257 | |
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258 | // Save state -- for checking layer if the map state changed. |
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259 | // We save this before redrawing, because in the process of redrawing |
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260 | // we will trigger more visibility changes, and we want to not redraw |
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261 | // and enter an infinite loop. |
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262 | var len = this.map.layers.length; |
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263 | this.layerStates = new Array(len); |
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264 | for (var i=0; i <len; i++) { |
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265 | var layer = this.map.layers[i]; |
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266 | this.layerStates[i] = { |
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267 | 'name': layer.name, |
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268 | 'visibility': layer.visibility, |
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269 | 'inRange': layer.inRange, |
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270 | 'id': layer.id |
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271 | }; |
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272 | } |
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273 | |
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274 | var layers = this.map.layers.slice(); |
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275 | if (!this.ascending) { layers.reverse(); } |
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276 | for(var i=0, len=layers.length; i<len; i++) { |
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277 | var layer = layers[i]; |
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278 | var baseLayer = layer.isBaseLayer; |
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279 | |
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280 | if (layer.displayInLayerSwitcher) { |
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281 | |
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282 | if (baseLayer) { |
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283 | containsBaseLayers = true; |
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284 | } else { |
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285 | containsOverlays = true; |
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286 | } |
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287 | |
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288 | // only check a baselayer if it is *the* baselayer, check data |
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289 | // layers if they are visible |
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290 | var checked = (baseLayer) ? (layer == this.map.baseLayer) |
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291 | : layer.getVisibility(); |
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292 | |
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293 | // create input element |
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294 | var inputElem = document.createElement("input"); |
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295 | inputElem.id = this.id + "_input_" + layer.name; |
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296 | inputElem.name = (baseLayer) ? this.id + "_baseLayers" : layer.name; |
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297 | inputElem.type = (baseLayer) ? "radio" : "checkbox"; |
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298 | inputElem.value = layer.name; |
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299 | inputElem.checked = checked; |
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300 | inputElem.defaultChecked = checked; |
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301 | |
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302 | if (!baseLayer && !layer.inRange) { |
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303 | inputElem.disabled = true; |
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304 | } |
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305 | var context = { |
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306 | 'inputElem': inputElem, |
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307 | 'layer': layer, |
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308 | 'layerSwitcher': this |
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309 | }; |
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310 | OpenLayers.Event.observe(inputElem, "mouseup", |
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311 | OpenLayers.Function.bindAsEventListener(this.onInputClick, |
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312 | context) |
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313 | ); |
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314 | |
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315 | // create span |
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316 | var labelSpan = document.createElement("span"); |
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317 | OpenLayers.Element.addClass(labelSpan, "labelSpan") |
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318 | if (!baseLayer && !layer.inRange) { |
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319 | labelSpan.style.color = "gray"; |
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320 | } |
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321 | labelSpan.innerHTML = layer.name; |
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322 | labelSpan.style.verticalAlign = (baseLayer) ? "bottom" |
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323 | : "baseline"; |
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324 | OpenLayers.Event.observe(labelSpan, "click", |
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325 | OpenLayers.Function.bindAsEventListener(this.onInputClick, |
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326 | context) |
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327 | ); |
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328 | // create line break |
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329 | var br = document.createElement("br"); |
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330 | |
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331 | |
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332 | var groupArray = (baseLayer) ? this.baseLayers |
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333 | : this.dataLayers; |
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334 | groupArray.push({ |
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335 | 'layer': layer, |
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336 | 'inputElem': inputElem, |
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337 | 'labelSpan': labelSpan |
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338 | }); |
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339 | |
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340 | |
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341 | var groupDiv = (baseLayer) ? this.baseLayersDiv |
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342 | : this.dataLayersDiv; |
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343 | groupDiv.appendChild(inputElem); |
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344 | groupDiv.appendChild(labelSpan); |
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345 | groupDiv.appendChild(br); |
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346 | } |
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347 | } |
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348 | |
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349 | // if no overlays, dont display the overlay label |
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350 | this.dataLbl.style.display = (containsOverlays) ? "" : "none"; |
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351 | |
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352 | // if no baselayers, dont display the baselayer label |
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353 | this.baseLbl.style.display = (containsBaseLayers) ? "" : "none"; |
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354 | |
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355 | return this.div; |
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356 | }, |
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357 | |
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358 | /** |
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359 | * Method: |
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360 | * A label has been clicked, check or uncheck its corresponding input |
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361 | * |
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362 | * Parameters: |
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363 | * e - {Event} |
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364 | * |
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365 | * Context: |
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366 | * - {DOMElement} inputElem |
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367 | * - {<OpenLayers.Control.LayerSwitcher>} layerSwitcher |
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368 | * - {<OpenLayers.Layer>} layer |
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369 | */ |
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370 | |
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371 | onInputClick: function(e) { |
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372 | |
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373 | if (!this.inputElem.disabled) { |
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374 | if (this.inputElem.type == "radio") { |
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375 | this.inputElem.checked = true; |
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376 | this.layer.map.setBaseLayer(this.layer); |
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377 | } else { |
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378 | this.inputElem.checked = !this.inputElem.checked; |
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379 | this.layerSwitcher.updateMap(); |
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380 | } |
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381 | } |
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382 | OpenLayers.Event.stop(e); |
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383 | }, |
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384 | |
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385 | /** |
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386 | * Method: onLayerClick |
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387 | * Need to update the map accordingly whenever user clicks in either of |
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388 | * the layers. |
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389 | * |
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390 | * Parameters: |
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391 | * e - {Event} |
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392 | */ |
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393 | onLayerClick: function(e) { |
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394 | this.updateMap(); |
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395 | }, |
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396 | |
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397 | |
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398 | /** |
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399 | * Method: updateMap |
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400 | * Cycles through the loaded data and base layer input arrays and makes |
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401 | * the necessary calls to the Map object such that that the map's |
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402 | * visual state corresponds to what the user has selected in |
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403 | * the control. |
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404 | */ |
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405 | updateMap: function() { |
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406 | |
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407 | // set the newly selected base layer |
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408 | for(var i=0, len=this.baseLayers.length; i<len; i++) { |
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409 | var layerEntry = this.baseLayers[i]; |
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410 | if (layerEntry.inputElem.checked) { |
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411 | this.map.setBaseLayer(layerEntry.layer, false); |
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412 | } |
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413 | } |
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414 | |
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415 | // set the correct visibilities for the overlays |
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416 | for(var i=0, len=this.dataLayers.length; i<len; i++) { |
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417 | var layerEntry = this.dataLayers[i]; |
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418 | layerEntry.layer.setVisibility(layerEntry.inputElem.checked); |
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419 | } |
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420 | |
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421 | }, |
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422 | |
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423 | /** |
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424 | * Method: maximizeControl |
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425 | * Set up the labels and divs for the control |
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426 | * |
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427 | * Parameters: |
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428 | * e - {Event} |
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429 | */ |
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430 | maximizeControl: function(e) { |
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431 | |
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432 | // set the div's width and height to empty values, so |
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433 | // the div dimensions can be controlled by CSS |
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434 | this.div.style.width = ""; |
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435 | this.div.style.height = ""; |
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436 | |
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437 | this.showControls(false); |
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438 | |
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439 | if (e != null) { |
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440 | OpenLayers.Event.stop(e); |
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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 | * Method: minimizeControl |
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446 | * Hide all the contents of the control, shrink the size, |
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447 | * add the maximize icon |
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448 | * |
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449 | * Parameters: |
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450 | * e - {Event} |
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451 | */ |
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452 | minimizeControl: function(e) { |
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453 | |
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454 | // to minimize the control we set its div's width |
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455 | // and height to 0px, we cannot just set "display" |
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456 | // to "none" because it would hide the maximize |
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457 | // div |
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458 | this.div.style.width = "0px"; |
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459 | this.div.style.height = "0px"; |
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460 | |
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461 | this.showControls(true); |
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462 | |
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463 | if (e != null) { |
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464 | OpenLayers.Event.stop(e); |
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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: showControls |
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470 | * Hide/Show all LayerSwitcher controls depending on whether we are |
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471 | * minimized or not |
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472 | * |
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473 | * Parameters: |
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474 | * minimize - {Boolean} |
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475 | */ |
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476 | showControls: function(minimize) { |
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477 | |
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478 | this.maximizeDiv.style.display = minimize ? "" : "none"; |
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479 | this.minimizeDiv.style.display = minimize ? "none" : ""; |
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480 | |
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481 | this.layersDiv.style.display = minimize ? "none" : ""; |
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482 | }, |
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483 | |
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484 | /** |
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485 | * Method: loadContents |
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486 | * Set up the labels and divs for the control |
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487 | */ |
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488 | loadContents: function() { |
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489 | |
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490 | //configure main div |
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491 | |
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492 | OpenLayers.Event.observe(this.div, "mouseup", |
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493 | OpenLayers.Function.bindAsEventListener(this.mouseUp, this)); |
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494 | OpenLayers.Event.observe(this.div, "click", |
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495 | this.ignoreEvent); |
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496 | OpenLayers.Event.observe(this.div, "mousedown", |
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497 | OpenLayers.Function.bindAsEventListener(this.mouseDown, this)); |
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498 | OpenLayers.Event.observe(this.div, "dblclick", this.ignoreEvent); |
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499 | |
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500 | // layers list div |
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501 | this.layersDiv = document.createElement("div"); |
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502 | this.layersDiv.id = this.id + "_layersDiv"; |
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503 | OpenLayers.Element.addClass(this.layersDiv, "layersDiv"); |
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504 | |
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505 | this.baseLbl = document.createElement("div"); |
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506 | this.baseLbl.innerHTML = OpenLayers.i18n("baseLayer"); |
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507 | OpenLayers.Element.addClass(this.baseLbl, "baseLbl"); |
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508 | |
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509 | this.baseLayersDiv = document.createElement("div"); |
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510 | OpenLayers.Element.addClass(this.baseLayersDiv, "baseLayersDiv"); |
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511 | |
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512 | this.dataLbl = document.createElement("div"); |
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513 | this.dataLbl.innerHTML = OpenLayers.i18n("overlays"); |
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514 | OpenLayers.Element.addClass(this.dataLbl, "dataLbl"); |
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515 | |
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516 | this.dataLayersDiv = document.createElement("div"); |
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517 | OpenLayers.Element.addClass(this.dataLayersDiv, "dataLayersDiv"); |
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518 | |
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519 | if (this.ascending) { |
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520 | this.layersDiv.appendChild(this.baseLbl); |
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521 | this.layersDiv.appendChild(this.baseLayersDiv); |
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522 | this.layersDiv.appendChild(this.dataLbl); |
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523 | this.layersDiv.appendChild(this.dataLayersDiv); |
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524 | } else { |
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525 | this.layersDiv.appendChild(this.dataLbl); |
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526 | this.layersDiv.appendChild(this.dataLayersDiv); |
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527 | this.layersDiv.appendChild(this.baseLbl); |
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528 | this.layersDiv.appendChild(this.baseLayersDiv); |
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529 | } |
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530 | |
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531 | this.div.appendChild(this.layersDiv); |
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532 | |
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533 | if(this.roundedCorner) { |
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534 | OpenLayers.Rico.Corner.round(this.div, { |
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535 | corners: "tl bl", |
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536 | bgColor: "transparent", |
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537 | color: this.roundedCornerColor, |
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538 | blend: false |
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539 | }); |
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540 | OpenLayers.Rico.Corner.changeOpacity(this.layersDiv, 0.75); |
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541 | } |
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542 | |
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543 | var imgLocation = OpenLayers.Util.getImagesLocation(); |
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544 | var sz = new OpenLayers.Size(18,18); |
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545 | |
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546 | // maximize button div |
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547 | var img = imgLocation + 'layer-switcher-maximize.png'; |
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548 | this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv( |
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549 | "OpenLayers_Control_MaximizeDiv", |
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550 | null, |
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551 | sz, |
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552 | img, |
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553 | "absolute"); |
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554 | OpenLayers.Element.addClass(this.maximizeDiv, "maximizeDiv"); |
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555 | this.maximizeDiv.style.display = "none"; |
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556 | OpenLayers.Event.observe(this.maximizeDiv, "click", |
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557 | OpenLayers.Function.bindAsEventListener(this.maximizeControl, this) |
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558 | ); |
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559 | |
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560 | this.div.appendChild(this.maximizeDiv); |
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561 | |
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562 | // minimize button div |
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563 | var img = imgLocation + 'layer-switcher-minimize.png'; |
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564 | var sz = new OpenLayers.Size(18,18); |
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565 | this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv( |
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566 | "OpenLayers_Control_MinimizeDiv", |
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567 | null, |
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568 | sz, |
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569 | img, |
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570 | "absolute"); |
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571 | OpenLayers.Element.addClass(this.minimizeDiv, "minimizeDiv"); |
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572 | this.minimizeDiv.style.display = "none"; |
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573 | OpenLayers.Event.observe(this.minimizeDiv, "click", |
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574 | OpenLayers.Function.bindAsEventListener(this.minimizeControl, this) |
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575 | ); |
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576 | |
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577 | this.div.appendChild(this.minimizeDiv); |
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578 | }, |
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579 | |
---|
580 | /** |
---|
581 | * Method: ignoreEvent |
---|
582 | * |
---|
583 | * Parameters: |
---|
584 | * evt - {Event} |
---|
585 | */ |
---|
586 | ignoreEvent: function(evt) { |
---|
587 | OpenLayers.Event.stop(evt); |
---|
588 | }, |
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589 | |
---|
590 | /** |
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591 | * Method: mouseDown |
---|
592 | * Register a local 'mouseDown' flag so that we'll know whether or not |
---|
593 | * to ignore a mouseUp event |
---|
594 | * |
---|
595 | * Parameters: |
---|
596 | * evt - {Event} |
---|
597 | */ |
---|
598 | mouseDown: function(evt) { |
---|
599 | this.isMouseDown = true; |
---|
600 | this.ignoreEvent(evt); |
---|
601 | }, |
---|
602 | |
---|
603 | /** |
---|
604 | * Method: mouseUp |
---|
605 | * If the 'isMouseDown' flag has been set, that means that the drag was |
---|
606 | * started from within the LayerSwitcher control, and thus we can |
---|
607 | * ignore the mouseup. Otherwise, let the Event continue. |
---|
608 | * |
---|
609 | * Parameters: |
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610 | * evt - {Event} |
---|
611 | */ |
---|
612 | mouseUp: function(evt) { |
---|
613 | if (this.isMouseDown) { |
---|
614 | this.isMouseDown = false; |
---|
615 | this.ignoreEvent(evt); |
---|
616 | } |
---|
617 | }, |
---|
618 | |
---|
619 | CLASS_NAME: "OpenLayers.Control.LayerSwitcher" |
---|
620 | }); |
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