scratch – Rev 117
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/*=========================
Mousewheel Control
===========================*/
s.mousewheel = {
event: false,
lastScrollTime: (new window.Date()).getTime()
};
function isEventSupported() {
var eventName = 'onwheel';
var isSupported = eventName in document;
if (!isSupported) {
var element = document.createElement('div');
element.setAttribute(eventName, 'return;');
isSupported = typeof element[eventName] === 'function';
}
if (!isSupported &&
document.implementation &&
document.implementation.hasFeature &&
// always returns true in newer browsers as per the standard.
// @see http://dom.spec.whatwg.org/#dom-domimplementation-hasfeature
document.implementation.hasFeature('', '') !== true ) {
// This is the only way to test support for the `wheel` event in IE9+.
isSupported = document.implementation.hasFeature('Events.wheel', '3.0');
}
return isSupported;
}
/**
* Mouse wheel (and 2-finger trackpad) support on the web sucks. It is
* complicated, thus this doc is long and (hopefully) detailed enough to answer
* your questions.
*
* If you need to react to the mouse wheel in a predictable way, this code is
* like your bestest friend. * hugs *
*
* As of today, there are 4 DOM event types you can listen to:
*
* 'wheel' -- Chrome(31+), FF(17+), IE(9+)
* 'mousewheel' -- Chrome, IE(6+), Opera, Safari
* 'MozMousePixelScroll' -- FF(3.5 only!) (2010-2013) -- don't bother!
* 'DOMMouseScroll' -- FF(0.9.7+) since 2003
*
* So what to do? The is the best:
*
* normalizeWheel.getEventType();
*
* In your event callback, use this code to get sane interpretation of the
* deltas. This code will return an object with properties:
*
* spinX -- normalized spin speed (use for zoom) - x plane
* spinY -- " - y plane
* pixelX -- normalized distance (to pixels) - x plane
* pixelY -- " - y plane
*
* Wheel values are provided by the browser assuming you are using the wheel to
* scroll a web page by a number of lines or pixels (or pages). Values can vary
* significantly on different platforms and browsers, forgetting that you can
* scroll at different speeds. Some devices (like trackpads) emit more events
* at smaller increments with fine granularity, and some emit massive jumps with
* linear speed or acceleration.
*
* This code does its best to normalize the deltas for you:
*
* - spin is trying to normalize how far the wheel was spun (or trackpad
* dragged). This is super useful for zoom support where you want to
* throw away the chunky scroll steps on the PC and make those equal to
* the slow and smooth tiny steps on the Mac. Key data: This code tries to
* resolve a single slow step on a wheel to 1.
*
* - pixel is normalizing the desired scroll delta in pixel units. You'll
* get the crazy differences between browsers, but at least it'll be in
* pixels!
*
* - positive value indicates scrolling DOWN/RIGHT, negative UP/LEFT. This
* should translate to positive value zooming IN, negative zooming OUT.
* This matches the newer 'wheel' event.
*
* Why are there spinX, spinY (or pixels)?
*
* - spinX is a 2-finger side drag on the trackpad, and a shift + wheel turn
* with a mouse. It results in side-scrolling in the browser by default.
*
* - spinY is what you expect -- it's the classic axis of a mouse wheel.
*
* - I dropped spinZ/pixelZ. It is supported by the DOM 3 'wheel' event and
* probably is by browsers in conjunction with fancy 3D controllers .. but
* you know.
*
* Implementation info:
*
* Examples of 'wheel' event if you scroll slowly (down) by one step with an
* average mouse:
*
* OS X + Chrome (mouse) - 4 pixel delta (wheelDelta -120)
* OS X + Safari (mouse) - N/A pixel delta (wheelDelta -12)
* OS X + Firefox (mouse) - 0.1 line delta (wheelDelta N/A)
* Win8 + Chrome (mouse) - 100 pixel delta (wheelDelta -120)
* Win8 + Firefox (mouse) - 3 line delta (wheelDelta -120)
*
* On the trackpad:
*
* OS X + Chrome (trackpad) - 2 pixel delta (wheelDelta -6)
* OS X + Firefox (trackpad) - 1 pixel delta (wheelDelta N/A)
*
* On other/older browsers.. it's more complicated as there can be multiple and
* also missing delta values.
*
* The 'wheel' event is more standard:
*
* http://www.w3.org/TR/DOM-Level-3-Events/#events-wheelevents
*
* The basics is that it includes a unit, deltaMode (pixels, lines, pages), and
* deltaX, deltaY and deltaZ. Some browsers provide other values to maintain
* backward compatibility with older events. Those other values help us
* better normalize spin speed. Example of what the browsers provide:
*
* | event.wheelDelta | event.detail
* ------------------+------------------+--------------
* Safari v5/OS X | -120 | 0
* Safari v5/Win7 | -120 | 0
* Chrome v17/OS X | -120 | 0
* Chrome v17/Win7 | -120 | 0
* IE9/Win7 | -120 | undefined
* Firefox v4/OS X | undefined | 1
* Firefox v4/Win7 | undefined | 3
*
*/
function normalizeWheel( /*object*/ event ) /*object*/ {
// Reasonable defaults
var PIXEL_STEP = 10;
var LINE_HEIGHT = 40;
var PAGE_HEIGHT = 800;
var sX = 0, sY = 0, // spinX, spinY
pX = 0, pY = 0; // pixelX, pixelY
// Legacy
if( 'detail' in event ) {
sY = event.detail;
}
if( 'wheelDelta' in event ) {
sY = -event.wheelDelta / 120;
}
if( 'wheelDeltaY' in event ) {
sY = -event.wheelDeltaY / 120;
}
if( 'wheelDeltaX' in event ) {
sX = -event.wheelDeltaX / 120;
}
// side scrolling on FF with DOMMouseScroll
if( 'axis' in event && event.axis === event.HORIZONTAL_AXIS ) {
sX = sY;
sY = 0;
}
pX = sX * PIXEL_STEP;
pY = sY * PIXEL_STEP;
if( 'deltaY' in event ) {
pY = event.deltaY;
}
if( 'deltaX' in event ) {
pX = event.deltaX;
}
if( (pX || pY) && event.deltaMode ) {
if( event.deltaMode === 1 ) { // delta in LINE units
pX *= LINE_HEIGHT;
pY *= LINE_HEIGHT;
} else { // delta in PAGE units
pX *= PAGE_HEIGHT;
pY *= PAGE_HEIGHT;
}
}
// Fall-back if spin cannot be determined
if( pX && !sX ) {
sX = (pX < 1) ? -1 : 1;
}
if( pY && !sY ) {
sY = (pY < 1) ? -1 : 1;
}
return {
spinX: sX,
spinY: sY,
pixelX: pX,
pixelY: pY
};
}
if (s.params.mousewheelControl) {
/**
* The best combination if you prefer spinX + spinY normalization. It favors
* the older DOMMouseScroll for Firefox, as FF does not include wheelDelta with
* 'wheel' event, making spin speed determination impossible.
*/
s.mousewheel.event = (navigator.userAgent.indexOf('firefox') > -1) ?
'DOMMouseScroll' :
isEventSupported() ?
'wheel' : 'mousewheel';
}
function handleMousewheel(e) {
if (e.originalEvent) e = e.originalEvent; //jquery fix
var delta = 0;
var rtlFactor = s.rtl ? -1 : 1;
var data = normalizeWheel( e );
if (s.params.mousewheelForceToAxis) {
if (s.isHorizontal()) {
if (Math.abs(data.pixelX) > Math.abs(data.pixelY)) delta = data.pixelX * rtlFactor;
else return;
}
else {
if (Math.abs(data.pixelY) > Math.abs(data.pixelX)) delta = data.pixelY;
else return;
}
}
else {
delta = Math.abs(data.pixelX) > Math.abs(data.pixelY) ? - data.pixelX * rtlFactor : - data.pixelY;
}
if (delta === 0) return;
if (s.params.mousewheelInvert) delta = -delta;
if (!s.params.freeMode) {
if ((new window.Date()).getTime() - s.mousewheel.lastScrollTime > 60) {
if (delta < 0) {
if ((!s.isEnd || s.params.loop) && !s.animating) {
s.slideNext();
s.emit('onScroll', s, e);
}
else if (s.params.mousewheelReleaseOnEdges) return true;
}
else {
if ((!s.isBeginning || s.params.loop) && !s.animating) {
s.slidePrev();
s.emit('onScroll', s, e);
}
else if (s.params.mousewheelReleaseOnEdges) return true;
}
}
s.mousewheel.lastScrollTime = (new window.Date()).getTime();
}
else {
//Freemode or scrollContainer:
var position = s.getWrapperTranslate() + delta * s.params.mousewheelSensitivity;
var wasBeginning = s.isBeginning,
wasEnd = s.isEnd;
if (position >= s.minTranslate()) position = s.minTranslate();
if (position <= s.maxTranslate()) position = s.maxTranslate();
s.setWrapperTransition(0);
s.setWrapperTranslate(position);
s.updateProgress();
s.updateActiveIndex();
if (!wasBeginning && s.isBeginning || !wasEnd && s.isEnd) {
s.updateClasses();
}
if (s.params.freeModeSticky) {
clearTimeout(s.mousewheel.timeout);
s.mousewheel.timeout = setTimeout(function () {
s.slideReset();
}, 300);
}
else {
if (s.params.lazyLoading && s.lazy) {
s.lazy.load();
}
}
// Emit event
s.emit('onScroll', s, e);
// Stop autoplay
if (s.params.autoplay && s.params.autoplayDisableOnInteraction) s.stopAutoplay();
// Return page scroll on edge positions
if (position === 0 || position === s.maxTranslate()) return;
}
if (e.preventDefault) e.preventDefault();
else e.returnValue = false;
return false;
}
s.disableMousewheelControl = function () {
if (!s.mousewheel.event) return false;
var target = s.container;
if (s.params.mousewheelEventsTarged !== 'container') {
target = $(s.params.mousewheelEventsTarged);
}
target.off(s.mousewheel.event, handleMousewheel);
s.params.mousewheelControl = false;
return true;
};
s.enableMousewheelControl = function () {
if (!s.mousewheel.event) return false;
var target = s.container;
if (s.params.mousewheelEventsTarged !== 'container') {
target = $(s.params.mousewheelEventsTarged);
}
target.on(s.mousewheel.event, handleMousewheel);
s.params.mousewheelControl = true;
return true;
};
Generated by GNU Enscript 1.6.5.90.