@qooxdoo/framework
Version:
The JS Framework for Coders
97 lines (84 loc) • 2.46 kB
JavaScript
/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2014 1&1 Internet AG, Germany, http://www.1und1.de
License:
MIT: https://opensource.org/licenses/MIT
See the LICENSE file in the project's top-level directory for details.
Authors:
* Daniel Wagner (danielwagner)
************************************************************************ */
/**
* Creates a gesture handler that fires high-level events such as "swipe"
* based on low-level event sequences on the given element
*
* @require(qx.module.Event)
* @use(qx.module.event.PointerHandler)
*
* @group (Event_Normalization)
*/
qx.Bootstrap.define("qx.module.event.GestureHandler", {
statics: {
TYPES: [
"tap",
"longtap",
"swipe",
"dbltap",
"track",
"trackstart",
"trackend",
"roll",
"rotate",
"pinch"
],
/**
* Creates a gesture handler for the given element when a gesture event listener
* is attached to it
*
* @param element {Element} DOM element
* @param type {String} event type
*/
register(element, type) {
if (!element.$$gestureHandler) {
if (!qx.core.Environment.get("event.dispatchevent")) {
if (!element.$$emitter) {
element.$$emitter = new qx.event.Emitter();
}
}
element.$$gestureHandler = new qx.event.handler.GestureCore(
element,
element.$$emitter
);
}
},
/**
* Removes the gesture event handler from the element if there are no more
* gesture event listeners attached to it
* @param element {Element} DOM element
*/
unregister(element) {
// check if there are any registered listeners left
if (element.$$gestureHandler) {
var listeners = element.$$emitter.getListeners();
for (var type in listeners) {
if (qx.module.event.GestureHandler.TYPES.indexOf(type) !== -1) {
if (listeners[type].length > 0) {
return;
}
}
}
// no more listeners, get rid of the handler
element.$$gestureHandler.dispose();
element.$$gestureHandler = undefined;
}
}
},
defer(statics) {
qxWeb.$registerEventHook(
statics.TYPES,
statics.register,
statics.unregister
);
}
});