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/**
* Javascript library to handle a set of keybindings.
*
* The user should include this script, and then call setKeybinding(key,
* callback) for each keybinding that is desired. This script will take care
* of listening for keypresses and mapping them to the callback functions, or
* doing nothing if no callback is set.
*
* $Horde: horde/templates/javascript/keybindings.js,v 1.5.4.6 2006/03/24 16:05:24 chuck Exp $
*
* See the enclosed file COPYING for license information (LGPL). If you did
* not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @package Horde
*/
/**
* A hash of keybindings.
*
* @var _keyMap
*/
var _keyMap = new Array();
/**
* Set up the keypress listener.
*/
if (typeof document.captureEvents != 'undefined') {
document.captureEvents(Event.KEYPRESS);
document.onkeypress = keyHandler;
} else {
document.onkeydown = keyHandler;
}
/**
* Sets up a callback for a keycode.
*
* @param key The keycode to trigger on.
* @param callback The function to call when "key" is pressed. Should be a
* function. It gets the event and the keycode as parameters,
* so that you can use one function to handle multiple keys if
* you like.
*/
function setKeybinding(key, callback)
{
if (typeof _keyMap[key] == 'undefined') {
_keyMap[key] = [];
}
if (typeof callback == 'function') {
_keyMap[key].push(callback);
} else {
_keyMap[key].push(new Function('e', 'key', callback + '(e, key);'));
}
}
/**
* Invoked by the JavaScript event model when a key is pressed. Gets
* the keycode (attempts to handle all browsers) and looks to see if
* we have a handler defined for that key. If so, call it.
*
* @param e The event to handle. Should be a keypress.
*/
function keyHandler(e)
{
var e = e || window.event;
if (e.keyCode) {
key = e.keyCode;
} else if (e.which) {
key = e.which;
}
/* If there's a handler defined for the key that was pressed, call
* it, passing in the keycode and the event. */
if (_keyMap[key]) {
for (var i = 0; i < _keyMap[key].length; ++i) {
if (_keyMap[key][i](e, key)) {
e.returnValue = false;
if (typeof e.preventDefault == 'function') {
e.preventDefault();
} else {
e.returnValue = true;
}
break;
}
}
}
}
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