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/Keyboard.js |
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9 | */ |
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10 | |
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11 | /** |
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12 | * Class: OpenLayers.Control.KeyboardDefaults |
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13 | * The KeyboardDefaults control adds panning and zooming functions, controlled |
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14 | * with the keyboard. By default arrow keys pan, +/- keys zoom & Page Up/Page |
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15 | * Down/Home/End scroll by three quarters of a page. |
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16 | * |
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17 | * This control has no visible appearance. |
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18 | * |
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19 | * Inherits from: |
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20 | * - <OpenLayers.Control> |
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21 | */ |
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22 | OpenLayers.Control.KeyboardDefaults = OpenLayers.Class(OpenLayers.Control, { |
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23 | |
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24 | /** |
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25 | * APIProperty: autoActivate |
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26 | * {Boolean} Activate the control when it is added to a map. Default is |
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27 | * true. |
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28 | */ |
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29 | autoActivate: true, |
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30 | |
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31 | /** |
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32 | * APIProperty: slideFactor |
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33 | * Pixels to slide by. |
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34 | */ |
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35 | slideFactor: 75, |
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36 | |
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37 | /** |
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38 | * Constructor: OpenLayers.Control.KeyboardDefaults |
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39 | */ |
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40 | initialize: function() { |
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41 | OpenLayers.Control.prototype.initialize.apply(this, arguments); |
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42 | }, |
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43 | |
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44 | /** |
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45 | * APIMethod: destroy |
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46 | */ |
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47 | destroy: function() { |
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48 | if (this.handler) { |
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49 | this.handler.destroy(); |
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50 | } |
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51 | this.handler = null; |
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52 | |
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53 | OpenLayers.Control.prototype.destroy.apply(this, arguments); |
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54 | }, |
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55 | |
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56 | /** |
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57 | * Method: draw |
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58 | * Create handler. |
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59 | */ |
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60 | draw: function() { |
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61 | this.handler = new OpenLayers.Handler.Keyboard( this, { |
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62 | "keydown": this.defaultKeyPress }); |
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63 | }, |
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64 | |
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65 | /** |
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66 | * Method: defaultKeyPress |
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67 | * When handling the key event, we only use evt.keyCode. This holds |
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68 | * some drawbacks, though we get around them below. When interpretting |
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69 | * the keycodes below (including the comments associated with them), |
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70 | * consult the URL below. For instance, the Safari browser returns |
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71 | * "IE keycodes", and so is supported by any keycode labeled "IE". |
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72 | * |
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73 | * Very informative URL: |
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74 | * http://unixpapa.com/js/key.html |
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75 | * |
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76 | * Parameters: |
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77 | * code - {Integer} |
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78 | */ |
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79 | defaultKeyPress: function (evt) { |
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80 | switch(evt.keyCode) { |
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81 | case OpenLayers.Event.KEY_LEFT: |
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82 | this.map.pan(-this.slideFactor, 0); |
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83 | break; |
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84 | case OpenLayers.Event.KEY_RIGHT: |
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85 | this.map.pan(this.slideFactor, 0); |
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86 | break; |
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87 | case OpenLayers.Event.KEY_UP: |
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88 | this.map.pan(0, -this.slideFactor); |
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89 | break; |
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90 | case OpenLayers.Event.KEY_DOWN: |
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91 | this.map.pan(0, this.slideFactor); |
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92 | break; |
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93 | |
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94 | case 33: // Page Up. Same in all browsers. |
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95 | var size = this.map.getSize(); |
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96 | this.map.pan(0, -0.75*size.h); |
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97 | break; |
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98 | case 34: // Page Down. Same in all browsers. |
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99 | var size = this.map.getSize(); |
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100 | this.map.pan(0, 0.75*size.h); |
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101 | break; |
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102 | case 35: // End. Same in all browsers. |
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103 | var size = this.map.getSize(); |
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104 | this.map.pan(0.75*size.w, 0); |
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105 | break; |
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106 | case 36: // Home. Same in all browsers. |
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107 | var size = this.map.getSize(); |
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108 | this.map.pan(-0.75*size.w, 0); |
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109 | break; |
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110 | |
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111 | case 43: // +/= (ASCII), keypad + (ASCII, Opera) |
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112 | case 61: // +/= (Mozilla, Opera, some ASCII) |
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113 | case 187: // +/= (IE) |
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114 | case 107: // keypad + (IE, Mozilla) |
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115 | this.map.zoomIn(); |
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116 | break; |
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117 | case 45: // -/_ (ASCII, Opera), keypad - (ASCII, Opera) |
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118 | case 109: // -/_ (Mozilla), keypad - (Mozilla, IE) |
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119 | case 189: // -/_ (IE) |
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120 | case 95: // -/_ (some ASCII) |
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121 | this.map.zoomOut(); |
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122 | break; |
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123 | } |
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124 | }, |
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125 | |
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126 | CLASS_NAME: "OpenLayers.Control.KeyboardDefaults" |
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127 | }); |
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