xobs/lca2020-pay-it-forward
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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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akiersky 2012-05-30 09:38:26 -03:00
parent eaca6465fa
commit 2e024b5b3e
1 changed files with 46 additions and 9 deletions
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55
js/reveal.js
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@ -25,7 +25,8 @@ var Reveal = (function(){
mouseWheel: true,
rollingLinks: true,
transition: 'default',
theme: 'default'
theme: 'default',
swipeDistance: 30
},
// Slides may hold a data-state attribute which we pick up and apply
@ -82,6 +83,8 @@ var Reveal = (function(){
// Bind all view events
document.addEventListener( 'keydown', onDocumentKeyDown, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
document.addEventListener( 'touchend', onDocumentTouchEnd, false );
window.addEventListener( 'hashchange', onWindowHashChange, false );
dom.controlsLeft.addEventListener( 'click', preventAndForward( navigateLeft ), false );
dom.controlsRight.addEventListener( 'click', preventAndForward( navigateRight ), false );
@ -235,6 +238,8 @@ var Reveal = (function(){
*
* @param {Object} event
*/
var touchStart = {}
var gesture = false;
function onDocumentTouchStart( event ) {
// We're only interested in one point taps
if (event.touches.length === 1) {
@ -245,34 +250,66 @@ var Reveal = (function(){
event.preventDefault();
var point = {
touchStart = {
x: event.touches[0].clientX,
y: event.touches[0].clientY
};
slide();
}
}
function onDocumentTouchMove( event ) {
event.preventDefault();
if(!gesture) {
var touch = {
x: event.touches[0].clientX,
y: event.touches[0].clientY
};
if((touch.x - touchStart.x) > config.swipeDistance){
gesture = true;
navigateLeft();
} else if((touch.x - touchStart.x) < -config.swipeDistance){
gesture = true;
navigateRight();
} else if((touch.y - touchStart.y) > config.swipeDistance){
gesture = true;
navigateUp();
} else if((touch.y - touchStart.y) < -config.swipeDistance){
gesture = true;
navigateDown();
}
}
}
function onDocumentTouchEnd( event ) {
event.preventDefault();
if(!gesture){//only check for control tap if no gesture is performed
// Define the extent of the areas that may be tapped
// to navigate
var wt = window.innerWidth * 0.3;
var ht = window.innerHeight * 0.3;
if( point.x < wt ) {
if( touchStart.x < wt ) {
navigateLeft();
}
else if( point.x > window.innerWidth - wt ) {
else if( touchStart.x > window.innerWidth - wt ) {
navigateRight();
}
else if( point.y < ht ) {
else if( touchStart.y < ht ) {
navigateUp();
}
else if( point.y > window.innerHeight - ht ) {
else if( touchStart.y > window.innerHeight - ht ) {
navigateDown();
}
slide();
}
gesture = false;
}
/**
* Handles mouse wheel scrolling, throttled to avoid
* skipping multiple slides.