65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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// @require: OpenLayers/Control.js
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/**
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* @class
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*/
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OpenLayers.Control.KeyboardDefaults = Class.create();
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OpenLayers.Control.KeyboardDefaults.prototype =
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Object.extend( new OpenLayers.Control(), {
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/** @type int */
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slideFactor: 50,
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/**
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* @constructor
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*/
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initialize: function() {
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OpenLayers.Control.prototype.initialize.apply(this, arguments);
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},
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/**
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*
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*/
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draw: function() {
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Event.observe(document,
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'keypress',
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this.defaultKeyDown.bind(this));
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},
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/**
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* @param {Event} evt
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*/
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defaultKeyDown: function (evt) {
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var slide = this.map.getResolution() * this.slideFactor;
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var center = this.map.getCenter();
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var newCenter = center.copyOf();
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switch(evt.keyCode) {
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case Event.KEY_LEFT:
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newCenter = newCenter.add( -slide, 0);
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break;
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case Event.KEY_RIGHT:
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newCenter = newCenter.add( slide, 0);
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break;
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case Event.KEY_UP:
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newCenter = newCenter.add( 0, slide);
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break;
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case Event.KEY_DOWN:
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newCenter = newCenter.add( 0, -slide);
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break;
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}
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if (!newCenter.equals(center)) {
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this.map.setCenter(newCenter);
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Event.stop(evt);
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}
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Control.KeyboardDefaults"
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});
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