gesture.js

'use strict';

define(['phaser'], function(Phaser) {
    function Gesture(game) {
        this.game = game;

        this.swipeDispatched = false;
        this.holdDispatched = false;

        this.isTouching = false;
        this.isHolding = false;

        this.onSwipe = new Phaser.Signal();
        this.onTap = new Phaser.Signal();
        this.onHold = new Phaser.Signal();

    }

    Gesture.prototype.update = function() {
        var distance = Phaser.Point.distance(this.game.input.activePointer.position, this.game.input.activePointer.positionDown);
        var duration = this.game.input.activePointer.duration;

        this.updateSwipe(distance, duration);
        this.updateTouch(distance, duration);
    };

    Gesture.prototype.updateSwipe = function(distance, duration) {
        if (duration === -1) {
            this.swipeDispatched = false;
        } else if (!this.swipeDispatched && distance > 150 &&  duration > 100 && duration < Gesture.TIMES.SWIPE) {
            var positionDown = this.game.input.activePointer.positionDown;
            this.onSwipe.dispatch(this, positionDown);

            this.swipeDispatched = true;
        }
    };

    Gesture.prototype.updateTouch = function(distance, duration) {
        var positionDown = this.game.input.activePointer.positionDown;

        if (duration === -1) {
                    if (this.isTouching) {
                this.onTap.dispatch(this, positionDown);
            }

            this.isTouching = false;
            this.isHolding = false;
            this.holdDispatched = false;

        } else if (distance < 10) {
            if (duration < Gesture.TIMES.HOLD) {
                this.isTouching = true;
            } else {
                this.isTouching = false;
                this.isHolding = true;

                if (!this.holdDispatched) {
                    this.holdDispatched = true;

                    this.onHold.dispatch(this, positionDown);
                }
            }
        } else {
            this.isTouching = false;
            this.isHolding = false;
        }
    };

    Gesture.SWIPE = 0;
    Gesture.TAP = 1;
    Gesture.HOLD = 2;

    Gesture.TIMES = {
        HOLD: 150,
        SWIPE: 250
    };

    return Gesture;
});