2 YUI 3.13.0 (build 508226d)
3 Copyright 2013 Yahoo! Inc. All rights reserved.
4 Licensed under the BSD License.
5 http://yuilibrary.com/license/
8 YUI.add('event-flick', function (Y, NAME) {
11 * The gestures module provides gesture events such as "flick", which normalize user interactions
12 * across touch and mouse or pointer based input devices. This layer can be used by application developers
13 * to build input device agnostic components which behave the same in response to either touch or mouse based
16 * <p>Documentation for events added by this module can be found in the event document for the <a href="../classes/YUI.html#events">YUI</a> global.</p>
21 YUI().use('event-flick', function (Y) {
22 Y.one('#myNode').on('flick', function (e) {
27 * @module event-gestures
31 * Adds support for a "flick" event, which is fired at the end of a touch or mouse based flick gesture, and provides
32 * velocity of the flick, along with distance and time information.
34 * <p>Documentation for the flick event can be found on the <a href="../classes/YUI.html#event_flick">YUI</a> global,
35 * along with the other supported events.</p>
37 * @module event-gestures
38 * @submodule event-flick
40 var GESTURE_MAP = Y.Event._GESTURE_MAP,
42 start: GESTURE_MAP.start,
44 move: GESTURE_MAP.move
50 OWNER_DOCUMENT = "ownerDocument",
51 MIN_VELOCITY = "minVelocity",
52 MIN_DISTANCE = "minDistance",
53 PREVENT_DEFAULT = "preventDefault",
56 _FLICK_START_HANDLE = "_fsh",
57 _FLICK_END_HANDLE = "_feh",
58 _FLICK_MOVE_HANDLE = "_fmh",
60 NODE_TYPE = "nodeType";
63 * Sets up a "flick" event, that is fired whenever the user initiates a flick gesture on the node
64 * where the listener is attached. The subscriber can specify a minimum distance or velocity for
65 * which the event is to be fired. The subscriber can also specify if there is a particular axis which
66 * they are interested in - "x" or "y". If no axis is specified, the axis along which there was most distance
69 * <p>It is recommended that you use Y.bind to set up context and additional arguments for your event handler,
70 * however if you want to pass the context and arguments as additional signature arguments to "on",
71 * you need to provide a null value for the configuration object, e.g: <code>node.on("flick", fn, null, context, arg1, arg2, arg3)</code></p>
75 * @param type {string} "flick"
76 * @param fn {function} The method the event invokes. It receives an event facade with an e.flick object containing the flick related properties: e.flick.time, e.flick.distance, e.flick.velocity and e.flick.axis, e.flick.start.
77 * @param cfg {Object} Optional. An object which specifies any of the following:
79 * <dt>minDistance (in pixels, defaults to 10)</dt>
80 * <dd>The minimum distance between start and end points, which would qualify the gesture as a flick.</dd>
81 * <dt>minVelocity (in pixels/ms, defaults to 0)</dt>
82 * <dd>The minimum velocity which would qualify the gesture as a flick.</dd>
83 * <dt>preventDefault (defaults to false)</dt>
84 * <dd>Can be set to true/false to prevent default behavior as soon as the touchstart/touchend or mousedown/mouseup is received so that things like scrolling or text selection can be
85 * prevented. This property can also be set to a function, which returns true or false, based on the event facade passed to it.</dd>
86 * <dt>axis (no default)</dt>
87 * <dd>Can be set to "x" or "y" if you want to constrain the flick velocity and distance to a single axis. If not
88 * defined, the axis along which the maximum distance was covered is used.</dd>
90 * @return {EventHandle} the detach handle
93 Y.Event.define('flick', {
95 on: function (node, subscriber, ce) {
97 var startHandle = node.on(EVENT[START],
104 subscriber[_FLICK_START_HANDLE] = startHandle;
107 detach: function (node, subscriber, ce) {
109 var startHandle = subscriber[_FLICK_START_HANDLE],
110 endHandle = subscriber[_FLICK_END_HANDLE];
113 startHandle.detach();
114 subscriber[_FLICK_START_HANDLE] = null;
119 subscriber[_FLICK_END_HANDLE] = null;
123 processArgs: function(args) {
124 var params = (args.length > 3) ? Y.merge(args.splice(3, 1)[0]) : {};
126 if (!(MIN_VELOCITY in params)) {
127 params[MIN_VELOCITY] = this.MIN_VELOCITY;
130 if (!(MIN_DISTANCE in params)) {
131 params[MIN_DISTANCE] = this.MIN_DISTANCE;
134 if (!(PREVENT_DEFAULT in params)) {
135 params[PREVENT_DEFAULT] = this.PREVENT_DEFAULT;
141 _onStart: function(e, node, subscriber, ce) {
143 var start = true, // always true for mouse
147 preventDefault = subscriber._extra.preventDefault,
151 start = (e.touches.length === 1);
157 if (preventDefault) {
158 // preventDefault is a boolean or function
159 if (!preventDefault.call || preventDefault(e)) {
160 origE.preventDefault();
165 time : new Date().getTime()
168 subscriber[_FLICK_START] = e;
170 endHandle = subscriber[_FLICK_END_HANDLE];
172 doc = (node.get(NODE_TYPE) === 9) ? node : node.get(OWNER_DOCUMENT);
174 endHandle = doc.on(EVENT[END], Y.bind(this._onEnd, this), null, node, subscriber, ce);
175 subscriber[_FLICK_END_HANDLE] = endHandle;
178 subscriber[_FLICK_MOVE_HANDLE] = doc.once(EVENT[MOVE], Y.bind(this._onMove, this), null, node, subscriber, ce);
182 _onMove: function(e, node, subscriber, ce) {
183 var start = subscriber[_FLICK_START];
185 // Start timing from first move.
186 if (start && start.flick) {
187 start.flick.time = new Date().getTime();
191 _onEnd: function(e, node, subscriber, ce) {
193 var endTime = new Date().getTime(),
194 start = subscriber[_FLICK_START],
205 moveHandle = subscriber[_FLICK_MOVE_HANDLE];
209 delete subscriber[_FLICK_MOVE_HANDLE];
214 if (e.changedTouches) {
215 if (e.changedTouches.length === 1 && e.touches.length === 0) {
216 endEvent = e.changedTouches[0];
224 params = subscriber._extra;
225 preventDefault = params[PREVENT_DEFAULT];
227 if (preventDefault) {
228 // preventDefault is a boolean or function
229 if (!preventDefault.call || preventDefault(e)) {
234 startTime = start.flick.time;
235 endTime = new Date().getTime();
236 time = endTime - startTime;
239 endEvent.pageX - start.pageX,
240 endEvent.pageY - start.pageY
246 axis = (Math.abs(xyDistance[0]) >= Math.abs(xyDistance[1])) ? 'x' : 'y';
249 distance = xyDistance[(axis === 'x') ? 0 : 1];
250 velocity = (time !== 0) ? distance/time : 0;
252 if (isFinite(velocity) && (Math.abs(distance) >= params[MIN_DISTANCE]) && (Math.abs(velocity) >= params[MIN_VELOCITY])) {
267 subscriber[_FLICK_START] = null;
274 PREVENT_DEFAULT : false
278 }, '3.13.0', {"requires": ["node-base", "event-touch", "event-synthetic"]});