(function() {
var Event = YAHOO.util.Event, Lang = YAHOO.lang;
/**
* KeyListener is a utility that provides an easy interface for listening for
* keydown/keyup events fired against DOM elements.
* @namespace YAHOO.util
* @class KeyListener
* @constructor
* @param {HTMLElement} attachTo The element or element ID to which the key
* event should be attached
* @param {String} attachTo The element or element ID to which the key
* event should be attached
* @param {Object} keyData The object literal representing the key(s)
* to detect. Possible attributes are
* shift(boolean), alt(boolean), ctrl(boolean)
* and keys(either an int or an array of ints
* representing keycodes).
* @param {Function} handler The CustomEvent handler to fire when the
* key event is detected
* @param {Object} handler An object literal representing the handler.
* @param {String} event Optional. The event (keydown or keyup) to
* listen for. Defaults automatically to keydown.
*
* @knownissue the "keypress" event is completely broken in Safari 2.x and below.
* the workaround is use "keydown" for key listening. However, if
* it is desired to prevent the default behavior of the keystroke,
* that can only be done on the keypress event. This makes key
* handling quite ugly.
* @knownissue keydown is also broken in Safari 2.x and below for the ESC key.
* There currently is no workaround other than choosing another
* key to listen for.
*/
YAHOO.util.KeyListener = function(attachTo, keyData, handler, event) {
if (!attachTo) {
YAHOO.log("No attachTo element specified", "error");
} else if (!keyData) {
YAHOO.log("No keyData specified", "error");
} else if (!handler) {
YAHOO.log("No handler specified", "error");
}
if (!event) {
event = YAHOO.util.KeyListener.KEYDOWN;
}
/**
* The CustomEvent fired internally when a key is pressed
* @event keyEvent
* @private
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
var keyEvent = new YAHOO.util.CustomEvent("keyPressed");
/**
* The CustomEvent fired when the KeyListener is enabled via the enable()
* function
* @event enabledEvent
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
this.enabledEvent = new YAHOO.util.CustomEvent("enabled");
/**
* The CustomEvent fired when the KeyListener is disabled via the
* disable() function
* @event disabledEvent
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
this.disabledEvent = new YAHOO.util.CustomEvent("disabled");
if (Lang.isString(attachTo)) {
attachTo = document.getElementById(attachTo); // No Dom util
}
if (Lang.isFunction(handler)) {
keyEvent.subscribe(handler);
} else {
keyEvent.subscribe(handler.fn, handler.scope, handler.correctScope);
}
/**
* Handles the key event when a key is pressed.
* @method handleKeyPress
* @param {DOMEvent} e The keypress DOM event
* @param {Object} obj The DOM event scope object
* @private
*/
function handleKeyPress(e, obj) {
if (! keyData.shift) {
keyData.shift = false;
}
if (! keyData.alt) {
keyData.alt = false;
}
if (! keyData.ctrl) {
keyData.ctrl = false;
}
// check held down modifying keys first
if (e.shiftKey == keyData.shift &&
e.altKey == keyData.alt &&
e.ctrlKey == keyData.ctrl) { // if we pass this, all modifiers match
var dataItem, keys = keyData.keys, key;
if (YAHOO.lang.isArray(keys)) {
for (var i=0;i<keys.length;i++) {
dataItem = keys[i];
key = Event.getCharCode(e);
if (dataItem == key) {
keyEvent.fire(key, e);
break;
}
}
} else {
key = Event.getCharCode(e);
if (keys == key ) {
keyEvent.fire(key, e);
}
}
}
}
/**
* Enables the KeyListener by attaching the DOM event listeners to the
* target DOM element
* @method enable
*/
this.enable = function() {
if (! this.enabled) {
Event.on(attachTo, event, handleKeyPress);
this.enabledEvent.fire(keyData);
}
/**
* Boolean indicating the enabled/disabled state of the Tooltip
* @property enabled
* @type Boolean
*/
this.enabled = true;
};
/**
* Disables the KeyListener by removing the DOM event listeners from the
* target DOM element
* @method disable
*/
this.disable = function() {
if (this.enabled) {
Event.removeListener(attachTo, event, handleKeyPress);
this.disabledEvent.fire(keyData);
}
this.enabled = false;
};
/**
* Returns a String representation of the object.
* @method toString
* @return {String} The string representation of the KeyListener
*/
this.toString = function() {
return "KeyListener [" + keyData.keys + "] " + attachTo.tagName +
(attachTo.id ? "[" + attachTo.id + "]" : "");
};
};
var KeyListener = YAHOO.util.KeyListener;
/**
* Constant representing the DOM "keydown" event.
* @property YAHOO.util.KeyListener.KEYDOWN
* @static
* @final
* @type String
*/
KeyListener.KEYDOWN = "keydown";
/**
* Constant representing the DOM "keyup" event.
* @property YAHOO.util.KeyListener.KEYUP
* @static
* @final
* @type String
*/
KeyListener.KEYUP = "keyup";
/**
* keycode constants for a subset of the special keys
* @property KEY
* @static
* @final
*/
KeyListener.KEY = {
ALT : 18,
BACK_SPACE : 8,
CAPS_LOCK : 20,
CONTROL : 17,
DELETE : 46,
DOWN : 40,
END : 35,
ENTER : 13,
ESCAPE : 27,
HOME : 36,
LEFT : 37,
META : 224,
NUM_LOCK : 144,
PAGE_DOWN : 34,
PAGE_UP : 33,
PAUSE : 19,
PRINTSCREEN : 44,
RIGHT : 39,
SCROLL_LOCK : 145,
SHIFT : 16,
SPACE : 32,
TAB : 9,
UP : 38
};
})();