decentralized-video-chat/public/js/jquery.ui.touch-punch.js

/*!
 * jQuery UI Touch Punch 0.2.3
 *
 * Copyright 2011–2014, Dave Furfero
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Depends:
 *  jquery.ui.widget.js
 *  jquery.ui.mouse.js
 */
(function ($) {
  // Detect touch support
  $.support.touch = "ontouchend" in document;

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

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

  /**
   * 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 (event.originalEvent.touches.length > 1) {
      return;
    }

    event.preventDefault();

    var touch = event.originalEvent.changedTouches[0],
      simulatedEvent = document.createEvent("MouseEvents");

    // Initialize the simulated mouse event using the touch event's coordinates
    simulatedEvent.initMouseEvent(
      simulatedType, // type
      true, // bubbles
      true, // cancelable
      window, // view
      1, // detail
      touch.screenX, // screenX
      touch.screenY, // screenY
      touch.clientX, // clientX
      touch.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 ||
      !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;

    // Delegate the touch handlers to the widget's element
    self.element.bind({
      touchstart: $.proxy(self, "_touchStart"),
      touchmove: $.proxy(self, "_touchMove"),
      touchend: $.proxy(self, "_touchEnd"),
    });

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

  /**
   * Remove the touch event handlers
   */
  mouseProto._mouseDestroy = function () {
    var self = this;

    // Delegate the touch handlers to the widget's element
    self.element.unbind({
      touchstart: $.proxy(self, "_touchStart"),
      touchmove: $.proxy(self, "_touchMove"),
      touchend: $.proxy(self, "_touchEnd"),
    });

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