added left, right, up, down gestures to change slides. moved window edge slide triggers to a touchend event to prevent interference of gestures
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js/reveal.js
55
js/reveal.js
@ -25,7 +25,8 @@ var Reveal = (function(){
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mouseWheel: true,
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rollingLinks: true,
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transition: 'default',
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theme: 'default'
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theme: 'default',
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swipeDistance: 30
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},
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// Slides may hold a data-state attribute which we pick up and apply
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@ -82,6 +83,8 @@ var Reveal = (function(){
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// Bind all view events
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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document.addEventListener( 'touchend', onDocumentTouchEnd, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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dom.controlsLeft.addEventListener( 'click', preventAndForward( navigateLeft ), false );
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dom.controlsRight.addEventListener( 'click', preventAndForward( navigateRight ), false );
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@ -235,6 +238,8 @@ var Reveal = (function(){
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*
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* @param {Object} event
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*/
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var touchStart = {}
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var gesture = false;
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function onDocumentTouchStart( event ) {
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// We're only interested in one point taps
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if (event.touches.length === 1) {
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@ -245,34 +250,66 @@ var Reveal = (function(){
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event.preventDefault();
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var point = {
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touchStart = {
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x: event.touches[0].clientX,
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y: event.touches[0].clientY
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};
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slide();
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}
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}
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function onDocumentTouchMove( event ) {
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event.preventDefault();
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if(!gesture) {
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var touch = {
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x: event.touches[0].clientX,
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y: event.touches[0].clientY
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};
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if((touch.x - touchStart.x) > config.swipeDistance){
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gesture = true;
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navigateLeft();
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} else if((touch.x - touchStart.x) < -config.swipeDistance){
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gesture = true;
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navigateRight();
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} else if((touch.y - touchStart.y) > config.swipeDistance){
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gesture = true;
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navigateUp();
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} else if((touch.y - touchStart.y) < -config.swipeDistance){
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gesture = true;
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navigateDown();
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}
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}
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}
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function onDocumentTouchEnd( event ) {
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event.preventDefault();
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if(!gesture){//only check for control tap if no gesture is performed
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// Define the extent of the areas that may be tapped
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// to navigate
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var wt = window.innerWidth * 0.3;
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var ht = window.innerHeight * 0.3;
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if( point.x < wt ) {
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if( touchStart.x < wt ) {
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navigateLeft();
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}
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else if( point.x > window.innerWidth - wt ) {
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else if( touchStart.x > window.innerWidth - wt ) {
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navigateRight();
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}
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else if( point.y < ht ) {
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else if( touchStart.y < ht ) {
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navigateUp();
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}
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else if( point.y > window.innerHeight - ht ) {
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else if( touchStart.y > window.innerHeight - ht ) {
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navigateDown();
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}
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slide();
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}
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gesture = false;
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}
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/**
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* Handles mouse wheel scrolling, throttled to avoid
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* skipping multiple slides.
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