/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2013 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* @class Phaser.Key
* @classdesc If you need more fine-grained control over the handling of specific keys you can create and use Phaser.Key objects.
* @constructor
* @param {Phaser.Game} game - Current game instance.
* @param {number} keycode - The key code this Key is responsible for.
*/
Phaser.Key = function (game, keycode) {
/**
* @property {Phaser.Game} game - A reference to the currently running game.
*/
this.game = game;
/**
* @property {boolean} isDown - The "down" state of the key.
* @default
*/
this.isDown = false;
/**
* @property {boolean} isUp - The "up" state of the key.
* @default
*/
this.isUp = false;
/**
* @property {boolean} altKey - The down state of the ALT key, if pressed at the same time as this key.
* @default
*/
this.altKey = false;
/**
* @property {boolean} ctrlKey - The down state of the CTRL key, if pressed at the same time as this key.
* @default
*/
this.ctrlKey = false;
/**
* @property {boolean} shiftKey - The down state of the SHIFT key, if pressed at the same time as this key.
* @default
*/
this.shiftKey = false;
/**
* @property {number} timeDown - The timestamp when the key was last pressed down.
* @default
*/
this.timeDown = 0;
/**
* If the key is down this value holds the duration of that key press and is constantly updated.
* If the key is up it holds the duration of the previous down session.
* @property {number} duration - The number of milliseconds this key has been held down for.
* @default
*/
this.duration = 0;
/**
* @property {number} timeUp - The timestamp when the key was last released.
* @default
*/
this.timeUp = 0;
/**
* @property {number} repeats - If a key is held down this holds down the number of times the key has 'repeated'.
* @default
*/
this.repeats = 0;
/**
* @property {number} keyCode - The keycode of this key.
*/
this.keyCode = keycode;
/**
* @property {Phaser.Signal} onDown - This Signal is dispatched every time this Key is pressed down. It is only dispatched once (until the key is released again).
*/
this.onDown = new Phaser.Signal();
/**
* @property {Phaser.Signal} onUp - This Signal is dispatched every time this Key is pressed down. It is only dispatched once (until the key is released again).
*/
this.onUp = new Phaser.Signal();
};
Phaser.Key.prototype = {
/**
* Called automatically by Phaser.Keyboard.
* @method Phaser.Key#processKeyDown
* @param {KeyboardEvent} event.
* @protected
*/
processKeyDown: function (event) {
this.altKey = event.altKey;
this.ctrlKey = event.ctrlKey;
this.shiftKey = event.shiftKey;
if (this.isDown)
{
// Key was already held down, this must be a repeat rate based event
this.duration = event.timeStamp - this.timeDown;
this.repeats++;
}
else
{
this.isDown = true;
this.isUp = false;
this.timeDown = event.timeStamp;
this.duration = 0;
this.repeats = 0;
this.onDown.dispatch(this);
}
},
/**
* Called automatically by Phaser.Keyboard.
* @method Phaser.Key#processKeyUp
* @param {KeyboardEvent} event.
* @protected
*/
processKeyUp: function (event) {
this.isDown = false;
this.isUp = true;
this.timeUp = event.timeStamp;
this.onUp.dispatch(this);
},
/**
* Returns the "just pressed" state of the Key. Just pressed is considered true if the key was pressed down within the duration given (default 250ms)
* @method Phaser.Key#justPressed
* @param {number} [duration=250] - The duration below which the key is considered as being just pressed.
* @return {boolean} True if the key is just pressed otherwise false.
*/
justPressed: function (duration) {
if (typeof duration === "undefined") { duration = 250; }
return (this.isDown && this.duration < duration);
},
/**
* Returns the "just released" state of the Key. Just released is considered as being true if the key was released within the duration given (default 250ms)
* @method Phaser.Key#justPressed
* @param {number} [duration=250] - The duration below which the key is considered as being just released.
* @return {boolean} True if the key is just released otherwise false.
*/
justReleased: function (duration) {
if (typeof duration === "undefined") { duration = 250; }
return (this.isDown == false && (this.game.time.now - this.timeUp < duration));
}
};