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<h1 class="file-heading">File: src\input\Key.ts</h1>
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<pre class="code prettyprint linenums">
/**
*
* @module Kiwi
* @submodule Input
*
*/
module Kiwi.Input {
/**
* A compact object that holds the most important details about a Keyboard Event response.
*
* @class Key
* @constructor
* @namespace Kiwi.Input
* @param manager {Kiwi.Input.Keyboard} The keyboard manager that this key belongs to.
* @param keycode {Number} The keycode that this key is.
* @param [event] {KeyboardEvent} The keyboard event (if there was one) when this was created.
* @return {Kiwi.Input.Key} This object.
*
*/
export class Key {
constructor (manager: Kiwi.Input.Keyboard, keycode: number, event?: KeyboardEvent) {
this._manager = manager;
this.game = this._manager.game;
this.keyCode = keycode;
if (event) {
this.update(event);
}
}
/**
* If the default action for this Key should be prevented or not.
* For example. If your game use's the spacebar you would want its default action (which is to make the website scrolldown) prevented,
* So you can set this to true.
* @property preventDefault
* @type Boolean
* @default false
* @public
*/
public preventDefault: boolean = false;
/**
* The game that this key belongs to.
* @property game
* @type Kiwi.Game
* @public
*/
public game: Kiwi.Game;
/**
* The type of object that this is.
* @method objType
* @return {String} "Key"
* @public
*/
public objType() {
return "Key";
}
/**
* The keyboard manager that this key belongs to.
* @property _manager
* @type Kiwi.Input.Keyboard
* @private
*/
private _manager: Kiwi.Input.Keyboard;
/**
* The keycode that this key is.
* @property keyCode
* @type Number
* @public
*/
public keyCode: number;
/**
* Indicated whether or not the key is currently down.
* @property isDown
* @type boolean
* @default false
* @public
*/
public isDown: boolean = false;
/**
* Indicates whether or not the key is currently up.
* @property isUp
* @type boolean
* @default true
* @public
*/
public isUp: boolean = true;
/**
* If the alt key was held at the time of the event happening.
* @property altKey
* @type boolean
* @default false
* @public
*/
public altKey: boolean = false;
/**
* If the ctrl key was held at the time of the event happening.
* @property ctrlKey
* @type boolean
* @default false
* @public
*/
public ctrlKey: boolean = false;
/**
* If the shift key was held at the time of the event happening.
* @property shiftKey
* @type boolean
* @default false
* @public
*/
public shiftKey: boolean = false;
/**
* The time that the key was pressed initially.
* @property timeDown
* @type Number
* @default 0
* @public
*/
public timeDown: number = 0;
/**
* The duration (in milliseconds) that the key has been down for.
* This is property is READ ONLY.
* @property duration
* @type Number
* @default 0
* @public
*/
public get duration(): number {
//If the key is down when the dev is getting the duration, then update the duration.
if (this.isDown) {
this.timeDown = this.game.time.now();
}
return (this.timeDown < this.timeUp) ? 0 : this.timeDown - this.timeUp;
}
/**
* The time at which the key was released.
* @property timeUp
* @type Number
* @default 0
* @public
*/
public timeUp: number = 0;
/**
* If this key is being 'held' down, this property will indicate the amount of times the 'onkeydown' event has fired.
* This is reset each time the key is pressed.
* @property repeats
* @type Number
* @default 0
* @public
*/
public repeats: number = 0;
/**
* The 'update' method fires when an event occur's. Updates the keys properties
* @method update
* @param event {KeyboardEvent}
* @public
*/
public update(event: KeyboardEvent) {
this.keyCode = event.keyCode;
//Are we needing to prevent the default action?
if (this.preventDefault) event.preventDefault();
if (event.type === 'keydown') {
this.altKey = event.altKey;
this.ctrlKey = event.ctrlKey;
this.shiftKey = event.shiftKey;
if (this.isDown === true) {
// Key was already held down, this must be a repeat rate based event
this.repeats++;
this.timeDown = this.game.time.now();
} else {
this.isDown = true;
this.isUp = false;
this.timeDown = this.game.time.now();
this.repeats = 0;
}
} else if (event.type === 'keyup') {
this.isDown = false;
this.isUp = true;
this.timeUp = this.game.time.now();
}
}
/**
* Returns a boolean indicating whether or not this key was just pressed.
* @method justPressed
* @param [duration] {Number} The duration at which determines if a key was just pressed. Defaults to the managers just pressed rate.
* @return {boolean}
* @public
*/
public justPressed(duration: number = this._manager.justPressedRate): boolean {
if (this.isDown === true && (this.timeDown + duration) > this.game.time.now()) {
return true;
} else {
return false;
}
}
/**
* Returns a boolean indicating whether or not this key was just released.
* @method justReleased
* @param [duration] {Number} The duration at which determines if a key was just released. Defaults to the managers just pressed rate.
* @return {boolean}
* @public
*/
public justReleased(duration: number = this._manager.justReleasedRate): boolean {
if (this.isUp === true && (this.timeUp + duration) > this.game.time.now()) {
return true;
}
else
{
return false;
}
}
/**
* Resets all of the properties on the Key to their default values.
* @method reset
* @public
*/
public reset() {
this.isDown = false;
this.isUp = true;
this.timeUp = 0;
this.timeDown = 0;
this.repeats = 0;
this.altKey = false;
this.shiftKey = false;
this.ctrlKey = false;
}
}
}
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