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Filename : jquery.ui.touch-punch-improved.js
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/*!
 * jQuery UI Touch Punch Improved 0.3.1
 *
 *
 * Copyright 2013, Chris Hutchinson <chris@brushd.com>
 * Original jquery-ui-touch-punch Copyright 2011, Dave Furfero
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Depends:
 * jquery.ui.widget.js
 * jquery.ui.mouse.js
 */
(function ($) {
  var pointerEnabled =
    window.navigator.pointerEnabled || window.navigator.msPointerEnabled;

  // Detect touch support
  $.support.touch = "ontouchend" in document || pointerEnabled;

  // Ignore browsers without touch support or mouse support
  if (!$.support.touch || !$.ui.mouse) {
    return;
  }

  var mouseProto = $.ui.mouse.prototype,
    _mouseInit = mouseProto._mouseInit,
    touchHandled;

  // see http://stackoverflow.com/a/12714084/220825
  function fixTouch(touch) {
    var winPageX = window.pageXOffset,
      winPageY = window.pageYOffset,
      x = touch.clientX,
      y = touch.clientY;

    if (
      (touch.pageY === 0 && Math.floor(y) > Math.floor(touch.pageY)) ||
      (touch.pageX === 0 && Math.floor(x) > Math.floor(touch.pageX))
    ) {
      // iOS4 clientX/clientY have the value that should have been
      // in pageX/pageY. While pageX/page/ have the value 0
      x = x - winPageX;
      y = y - winPageY;
    } else if (y < touch.pageY - winPageY || x < touch.pageX - winPageX) {
      // Some Android browsers have totally bogus values for clientX/Y
      // when scrolling/zooming a page. Detectable since clientX/clientY
      // should never be smaller than pageX/pageY minus page scroll
      x = touch.pageX - winPageX;
      y = touch.pageY - winPageY;
    }

    return {
      clientX: x,
      clientY: y,
    };
  }

  /**
   * Simulate a mouse event based on a corresponding touch event
   * @param {Object} event A touch event
   * @param {String} simulatedType The corresponding mouse event
   */
  function simulateMouseEvent(event, simulatedType) {
    // Ignore multi-touch events
    if (
      (!pointerEnabled && event.originalEvent.touches.length > 1) ||
      (pointerEnabled && !event.isPrimary)
    ) {
      return;
    }

    var touch = pointerEnabled
        ? event.originalEvent
        : event.originalEvent.changedTouches[0],
      simulatedEvent = document.createEvent("MouseEvents"),
      coord = fixTouch(touch);

    // Check if element is an input or a textarea
    if ($(touch.target).is("input") || $(touch.target).is("textarea")) {
      event.stopPropagation();
    } else {
      event.preventDefault();
    }

    // Initialize the simulated mouse event using the touch event's coordinates
    simulatedEvent.initMouseEvent(
      simulatedType, // type
      true, // bubbles
      true, // cancelable
      window, // view
      1, // detail
      event.screenX || touch.screenX, // screenX
      event.screenY || touch.screenY, // screenY
      event.clientX || coord.clientX, // clientX
      event.clientY || coord.clientY, // clientY
      false, // ctrlKey
      false, // altKey
      false, // shiftKey
      false, // metaKey
      0, // button
      null // relatedTarget
    );

    // Dispatch the simulated event to the target element
    event.target.dispatchEvent(simulatedEvent);
  }

  /**
   * Handle the jQuery UI widget's touchstart events
   * @param {Object} event The widget element's touchstart event
   */
  mouseProto._touchStart = function (event) {
    var self = this;

    // Ignore the event if another widget is already being handled
    if (
      touchHandled ||
      (!pointerEnabled &&
        !self._mouseCapture(event.originalEvent.changedTouches[0]))
    ) {
      return;
    }

    // Set the flag to prevent other widgets from inheriting the touch event
    touchHandled = true;

    // Track movement to determine if interaction was a click
    self._touchMoved = false;

    // Simulate the mouseover event
    simulateMouseEvent(event, "mouseover");

    // Simulate the mousemove event
    simulateMouseEvent(event, "mousemove");

    // Simulate the mousedown event
    simulateMouseEvent(event, "mousedown");
  };

  /**
   * Handle the jQuery UI widget's touchmove events
   * @param {Object} event The document's touchmove event
   */
  mouseProto._touchMove = function (event) {
    // Ignore event if not handled
    if (!touchHandled) {
      return;
    }

    // Interaction was not a click
    this._touchMoved = true;

    // Simulate the mousemove event
    simulateMouseEvent(event, "mousemove");
  };

  /**
   * Handle the jQuery UI widget's touchend events
   * @param {Object} event The document's touchend event
   */
  mouseProto._touchEnd = function (event) {
    // Ignore event if not handled
    if (!touchHandled) {
      return;
    }

    // Simulate the mouseup event
    simulateMouseEvent(event, "mouseup");

    // Simulate the mouseout event
    simulateMouseEvent(event, "mouseout");

    // If the touch interaction did not move, it should trigger a click
    if (!this._touchMoved) {
      // Simulate the click event
      simulateMouseEvent(event, "click");
    }

    // Unset the flag to allow other widgets to inherit the touch event
    touchHandled = false;
  };

  /**
   * A duck punch of the $.ui.mouse _mouseInit method to support touch events.
   * This method extends the widget with bound touch event handlers that
   * translate touch events to mouse events and pass them to the widget's
   * original mouse event handling methods.
   */
  mouseProto._mouseInit = function () {
    var self = this;

    self.element.on({
      touchstart: $.proxy(self, "_touchStart"),
      touchmove: $.proxy(self, "_touchMove"),
      touchend: $.proxy(self, "_touchEnd"),
      pointerDown: $.proxy(self, "_touchStart"),
      pointerMove: $.proxy(self, "_touchMove"),
      pointerUp: $.proxy(self, "_touchEnd"),
      MSPointerDown: $.proxy(self, "_touchStart"),
      MSPointerMove: $.proxy(self, "_touchMove"),
      MSPointerUp: $.proxy(self, "_touchEnd"),
    });

    // Call the original $.ui.mouse init method
    _mouseInit.call(self);
  };
})(jQuery);