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by Keith Hughitt
Helioviewer.org 2.0.2 |
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/**
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* @fileOverview
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* @author <a href="mailto:keith.hughitt@nasa.gov">Keith Hughitt</a>
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*/
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/*jslint browser: true, white: true, onevar: true, undef: true, nomen: false, eqeqeq: true, plusplus: true,
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bitwise: true, regexp: true, strict: true, newcap: true, immed: true, maxlen: 120, sub: true */
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/*globals document, $, Class */
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"use strict"; |
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var KeyboardManager = Class.extend( |
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/** @lends KeyboardManager.prototype */
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{
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/**
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* @constructs
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*/
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init: function (controller) { |
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this.controller = controller; |
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this._initEventHandlers(); |
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},
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/**
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* @description Initialize keyboard-related event handlers.
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*
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* TODO: use events or public method instead of zoomControl's (private) method.
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*
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* TODO (2009/07/29): Webkit doesn't support keypress events for non alphanumeric
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* keys (http://ejohn.org/blog/keypress-in-safari-31/).
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*
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* Instead of using keypress, it may be better to use keydown and a boolean to decide
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* when vp is moving and when it should be stationary.
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*
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* Simple implementation:
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* vp.movingUp (Boolean), vp.movingDown (Boolean), vp.movingLeft (Boolean), vp.movingRight (Boolean)
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*
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* From there it is also simple to add support for diagonal movement, etc.
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*/
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_initEventHandlers: function () { |
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var onKeyPress, self = this; |
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/**
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* @description Sets up keyboard shortcuts
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* @TODO 01/04/2010: Use something like js-hotkeys (http://code.google.com/p/js-hotkeys/)
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* to allow for more advanced keyboard navigation such as "cntl + z" to undo, etc
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* TODO 01/16/2009: Create buttons for mouse-coord and detail toggles
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*/
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onKeyPress = function (e) { |
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var key, character, vp = self.controller.viewport; |
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// Letters use Event.which, while arrows, etc. use Event.keyCode
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if (e.keyCode) { |
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key = e.keyCode; |
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}
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else if (e.which) { |
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key = e.which; |
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}
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// Get character pressed (letters, etc)
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character = String.fromCharCode(key); |
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// Arrow keys
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if (key === 37 || key === 38 || key === 39 || key === 40) { |
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vp.startMoving(); |
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vp.moveCounter += 1; // Threshold |
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//if ((vp.moveCounter % vp.imageUpdateThrottle) !== 0)
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// return;
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vp.moveCounter = vp.moveCounter % vp.tileUpdateThrottle; |
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//Right-arrow
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if (key === 37) { |
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vp.moveBy(8, 0); |
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}
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//Up-arrow
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else if (key === 38) { |
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vp.moveBy(0, 8); |
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}
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//Left-arrow
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else if (key === 39) { |
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vp.moveBy(-8, 0); |
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}
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//Down-arrow
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else if (key === 40) { |
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vp.moveBy(0, -8); |
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}
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vp.endMoving(); |
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return false; |
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}
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else if (character === "c") { |
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$("#center-button").click(); |
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}
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else if (character === "m") { |
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vp.toggleMouseCoords(); |
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}
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else if (character === "-" || character === "_") { |
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$("#zoomControlZoomOut").click(); |
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}
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else if (character === "=" || character === "+") { |
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$("#zoomControlZoomIn").click(); |
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}
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else if (character === "d") { |
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self.controller.eventLayers.toggleLabels(); |
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}
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else if (character === "f") { |
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$("#fullscreen-btn").click(); |
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}
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else if (character === ",") { |
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$("#timeBackBtn").click(); |
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}
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else if (character === ".") { |
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$("#timeForwardBtn").click(); |
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}
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};
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// Event-handlers
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$(document).keypress(function (e) { |
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if (e.target.tagName !== "INPUT") { |
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onKeyPress(e); |
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}
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});
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}
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});
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