1 | /** |
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2 | * Copyright (c) 2008-2010 The Open Source Geospatial Foundation |
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3 | * |
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4 | * Published under the BSD license. |
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5 | * See http://svn.geoext.org/core/trunk/geoext/license.txt for the full text |
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6 | * of the license. |
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7 | */ |
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8 | |
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9 | /** |
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10 | * @include GeoExt/widgets/tips/ZoomSliderTip.js |
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11 | */ |
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12 | |
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13 | /** api: (define) |
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14 | * module = GeoExt |
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15 | * class = ZoomSlider |
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16 | * base_link = `Ext.Slider <http://dev.sencha.com/deploy/dev/docs/?class=Ext.Slider>`_ |
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17 | */ |
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18 | Ext.namespace("GeoExt"); |
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19 | |
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20 | /** api: example |
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21 | * Sample code to render a slider outside the map viewport: |
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22 | * |
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23 | * .. code-block:: javascript |
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24 | * |
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25 | * var slider = new GeoExt.ZoomSlider({ |
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26 | * renderTo: document.body, |
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27 | * width: 200, |
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28 | * map: map |
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29 | * }); |
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30 | * |
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31 | * Sample code to add a slider to a map panel: |
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32 | * |
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33 | * .. code-block:: javascript |
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34 | * |
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35 | * var panel = new GeoExt.MapPanel({ |
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36 | * renderTo: document.body, |
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37 | * height: 300, |
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38 | * width: 400, |
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39 | * map: { |
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40 | * controls: [new OpenLayers.Control.Navigation()] |
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41 | * }, |
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42 | * layers: [new OpenLayers.Layer.WMS( |
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43 | * "Global Imagery", |
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44 | * "http://maps.opengeo.org/geowebcache/service/wms", |
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45 | * {layers: "bluemarble"} |
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46 | * )], |
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47 | * extent: [-5, 35, 15, 55], |
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48 | * items: [{ |
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49 | * xtype: "gx_zoomslider", |
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50 | * aggressive: true, |
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51 | * vertical: true, |
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52 | * height: 100, |
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53 | * x: 10, |
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54 | * y: 20 |
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55 | * }] |
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56 | * }); |
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57 | */ |
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58 | |
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59 | /** api: constructor |
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60 | * .. class:: ZoomSlider(config) |
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61 | * |
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62 | * Create a slider for controlling a map's zoom level. |
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63 | */ |
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64 | GeoExt.ZoomSlider = Ext.extend(Ext.Slider, { |
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65 | |
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66 | /** api: config[map] |
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67 | * ``OpenLayers.Map`` or :class:`GeoExt.MapPanel` |
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68 | * The map that the slider controls. |
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69 | */ |
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70 | map: null, |
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71 | |
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72 | /** api: config[baseCls] |
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73 | * ``String`` |
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74 | * The CSS class name for the slider elements. Default is "gx-zoomslider". |
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75 | */ |
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76 | baseCls: "gx-zoomslider", |
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77 | |
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78 | /** api: config[aggressive] |
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79 | * ``Boolean`` |
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80 | * If set to true, the map is zoomed as soon as the thumb is moved. Otherwise |
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81 | * the map is zoomed when the thumb is released (default). |
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82 | */ |
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83 | aggressive: false, |
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84 | |
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85 | /** private: property[updating] |
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86 | * ``Boolean`` |
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87 | * The slider position is being updated by itself (based on map zoomend). |
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88 | */ |
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89 | updating: false, |
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90 | |
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91 | /** private: method[initComponent] |
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92 | * Initialize the component. |
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93 | */ |
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94 | initComponent: function() { |
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95 | GeoExt.ZoomSlider.superclass.initComponent.call(this); |
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96 | |
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97 | if(this.map) { |
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98 | if(this.map instanceof GeoExt.MapPanel) { |
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99 | this.map = this.map.map; |
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100 | } |
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101 | this.bind(this.map); |
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102 | } |
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103 | |
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104 | if (this.aggressive === true) { |
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105 | this.on('change', this.changeHandler, this); |
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106 | } else { |
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107 | this.on('changecomplete', this.changeHandler, this); |
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108 | } |
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109 | this.on("beforedestroy", this.unbind, this); |
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110 | }, |
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111 | |
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112 | /** private: method[onRender] |
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113 | * Override onRender to set base css class. |
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114 | */ |
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115 | onRender: function() { |
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116 | GeoExt.ZoomSlider.superclass.onRender.apply(this, arguments); |
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117 | this.el.addClass(this.baseCls); |
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118 | }, |
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119 | |
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120 | /** private: method[afterRender] |
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121 | * Override afterRender because the render event is fired too early |
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122 | * to call update. |
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123 | */ |
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124 | afterRender : function(){ |
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125 | Ext.Slider.superclass.afterRender.apply(this, arguments); |
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126 | this.update(); |
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127 | }, |
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128 | |
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129 | /** private: method[addToMapPanel] |
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130 | * :param panel: :class:`GeoExt.MapPanel` |
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131 | * |
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132 | * Called by a MapPanel if this component is one of the items in the panel. |
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133 | */ |
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134 | addToMapPanel: function(panel) { |
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135 | this.on({ |
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136 | render: function() { |
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137 | var el = this.getEl(); |
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138 | el.setStyle({ |
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139 | position: "absolute", |
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140 | zIndex: panel.map.Z_INDEX_BASE.Control |
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141 | }); |
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142 | el.on({ |
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143 | mousedown: this.stopMouseEvents, |
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144 | click: this.stopMouseEvents |
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145 | }); |
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146 | }, |
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147 | afterrender: function() { |
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148 | this.bind(panel.map); |
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149 | }, |
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150 | scope: this |
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151 | }); |
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152 | }, |
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153 | |
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154 | /** private: method[stopMouseEvents] |
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155 | * :param e: ``Object`` |
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156 | */ |
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157 | stopMouseEvents: function(e) { |
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158 | e.stopEvent(); |
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159 | }, |
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160 | |
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161 | /** private: method[removeFromMapPanel] |
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162 | * :param panel: :class:`GeoExt.MapPanel` |
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163 | * |
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164 | * Called by a MapPanel if this component is one of the items in the panel. |
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165 | */ |
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166 | removeFromMapPanel: function(panel) { |
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167 | var el = this.getEl(); |
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168 | el.un("mousedown", this.stopMouseEvents, this); |
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169 | el.un("click", this.stopMouseEvents, this); |
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170 | this.unbind(); |
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171 | }, |
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172 | |
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173 | /** private: method[bind] |
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174 | * :param map: ``OpenLayers.Map`` |
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175 | */ |
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176 | bind: function(map) { |
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177 | this.map = map; |
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178 | this.map.events.on({ |
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179 | zoomend: this.update, |
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180 | changebaselayer: this.initZoomValues, |
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181 | scope: this |
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182 | }); |
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183 | if(this.map.baseLayer) { |
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184 | this.initZoomValues(); |
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185 | this.update(); |
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186 | } |
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187 | }, |
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188 | |
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189 | /** private: method[unbind] |
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190 | */ |
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191 | unbind: function() { |
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192 | if(this.map) { |
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193 | this.map.events.un({ |
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194 | zoomend: this.update, |
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195 | changebaselayer: this.initZoomValues, |
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196 | scope: this |
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197 | }); |
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198 | } |
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199 | }, |
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200 | |
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201 | /** private: method[initZoomValues] |
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202 | * Set the min/max values for the slider if not set in the config. |
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203 | */ |
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204 | initZoomValues: function() { |
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205 | var layer = this.map.baseLayer; |
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206 | if(this.initialConfig.minValue === undefined) { |
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207 | this.minValue = layer.minZoomLevel || 0; |
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208 | } |
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209 | if(this.initialConfig.maxValue === undefined) { |
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210 | this.maxValue = layer.minZoomLevel == null ? |
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211 | layer.numZoomLevels - 1 : layer.maxZoomLevel; |
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212 | } |
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213 | }, |
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214 | |
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215 | /** api: method[getZoom] |
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216 | * :return: ``Number`` The map zoom level. |
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217 | * |
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218 | * Get the zoom level for the associated map based on the slider value. |
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219 | */ |
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220 | getZoom: function() { |
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221 | return this.getValue(); |
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222 | }, |
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223 | |
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224 | /** api: method[getScale] |
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225 | * :return: ``Number`` The map scale denominator. |
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226 | * |
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227 | * Get the scale denominator for the associated map based on the slider value. |
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228 | */ |
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229 | getScale: function() { |
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230 | return OpenLayers.Util.getScaleFromResolution( |
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231 | this.map.getResolutionForZoom(this.getValue()), |
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232 | this.map.getUnits() |
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233 | ); |
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234 | }, |
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235 | |
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236 | /** api: method[getResolution] |
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237 | * :return: ``Number`` The map resolution. |
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238 | * |
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239 | * Get the resolution for the associated map based on the slider value. |
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240 | */ |
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241 | getResolution: function() { |
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242 | return this.map.getResolutionForZoom(this.getValue()); |
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243 | }, |
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244 | |
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245 | /** private: method[changeHandler] |
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246 | * Registered as a listener for slider changecomplete. Zooms the map. |
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247 | */ |
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248 | changeHandler: function() { |
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249 | if(this.map && !this.updating) { |
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250 | this.map.zoomTo(this.getValue()); |
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251 | } |
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252 | }, |
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253 | |
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254 | /** private: method[update] |
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255 | * Registered as a listener for map zoomend. Updates the value of the slider. |
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256 | */ |
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257 | update: function() { |
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258 | if(this.rendered && this.map) { |
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259 | this.updating = true; |
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260 | this.setValue(this.map.getZoom()); |
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261 | this.updating = false; |
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262 | } |
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263 | } |
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264 | |
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265 | }); |
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266 | |
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267 | /** api: xtype = gx_zoomslider */ |
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268 | Ext.reg('gx_zoomslider', GeoExt.ZoomSlider); |
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