1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for * full list of contributors). Published under the Clear BSD license. * See http://svn.openlayers.org/trunk/openlayers/license.txt for the * full text of the license. */ /** * @requires OpenLayers/Control.js * @requires OpenLayers/Handler/Keyboard.js */ /** * Class: OpenLayers.Control.KeyboardDefaults * The KeyboardDefaults control adds panning and zooming functions, controlled * with the keyboard. By default arrow keys pan, +/- keys zoom & Page Up/Page * Down/Home/End scroll by three quarters of a page. * * This control has no visible appearance. * * Inherits from: * - <OpenLayers.Control> */ OpenLayers.Control.KeyboardDefaults = OpenLayers.Class(OpenLayers.Control, { /** * APIProperty: autoActivate * {Boolean} Activate the control when it is added to a map. Default is * true. */ autoActivate: true, /** * APIProperty: slideFactor * Pixels to slide by. */ slideFactor: 75, /** * Constructor: OpenLayers.Control.KeyboardDefaults */ initialize: function() { OpenLayers.Control.prototype.initialize.apply(this, arguments); }, /** * APIMethod: destroy */ destroy: function() { if (this.handler) { this.handler.destroy(); } this.handler = null; OpenLayers.Control.prototype.destroy.apply(this, arguments); }, /** * Method: draw * Create handler. */ draw: function() { this.handler = new OpenLayers.Handler.Keyboard( this, { "keydown": this.defaultKeyPress }); }, /** * Method: defaultKeyPress * When handling the key event, we only use evt.keyCode. This holds * some drawbacks, though we get around them below. When interpretting * the keycodes below (including the comments associated with them), * consult the URL below. For instance, the Safari browser returns * "IE keycodes", and so is supported by any keycode labeled "IE". * * Very informative URL: * http://unixpapa.com/js/key.html * * Parameters: * code - {Integer} */ defaultKeyPress: function (evt) { switch(evt.keyCode) { case OpenLayers.Event.KEY_LEFT: this.map.pan(-this.slideFactor, 0); break; case OpenLayers.Event.KEY_RIGHT: this.map.pan(this.slideFactor, 0); break; case OpenLayers.Event.KEY_UP: this.map.pan(0, -this.slideFactor); break; case OpenLayers.Event.KEY_DOWN: this.map.pan(0, this.slideFactor); break; case 33: // Page Up. Same in all browsers. var size = this.map.getSize(); this.map.pan(0, -0.75*size.h); break; case 34: // Page Down. Same in all browsers. var size = this.map.getSize(); this.map.pan(0, 0.75*size.h); break; case 35: // End. Same in all browsers. var size = this.map.getSize(); this.map.pan(0.75*size.w, 0); break; case 36: // Home. Same in all browsers. var size = this.map.getSize(); this.map.pan(-0.75*size.w, 0); break; case 43: // +/= (ASCII), keypad + (ASCII, Opera) case 61: // +/= (Mozilla, Opera, some ASCII) case 187: // +/= (IE) case 107: // keypad + (IE, Mozilla) this.map.zoomIn(); break; case 45: // -/_ (ASCII, Opera), keypad - (ASCII, Opera) case 109: // -/_ (Mozilla), keypad - (Mozilla, IE) case 189: // -/_ (IE) case 95: // -/_ (some ASCII) this.map.zoomOut(); break; } }, CLASS_NAME: "OpenLayers.Control.KeyboardDefaults" }); |