461 lines
13 KiB
JavaScript
461 lines
13 KiB
JavaScript
/**
|
|
* Copyright (C) 2011 Hakim El Hattab, http://hakim.se
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
/**
|
|
* Reveal.js is an easy to use HTML based slideshow enhanced by
|
|
* sexy CSS 3D transforms.
|
|
*
|
|
* Slides are given unique hash based URL's so that they can be
|
|
* opened directly.
|
|
*
|
|
* Public facing methods:
|
|
* - Reveal.initialize( { ... options ... } );
|
|
* - Reveal.navigateTo( indexh, indexv );
|
|
* - Reveal.navigateLeft();
|
|
* - Reveal.navigateRight();
|
|
* - Reveal.navigateUp();
|
|
* - Reveal.navigateDown();
|
|
*
|
|
*
|
|
* version 0.1:
|
|
* - First release
|
|
*
|
|
* version 0.2:
|
|
* - Refactored code and added inline documentation
|
|
* - Slides now have unique URL's
|
|
* - A basic API to invoke navigation was added
|
|
*
|
|
* version 0.3:
|
|
* - Added licensing terms
|
|
* - Fixed broken links on touch devices
|
|
*
|
|
* version 1.0:
|
|
* - Added controls
|
|
* - Added initialization options
|
|
* - Reveal views in fragments
|
|
* - Revamped, darker, theme
|
|
* - Tweaked markup styles (a, em, strong, b, i, blockquote, q, pre, ul, ol)
|
|
* - Support for themes at initialization (default/linear/concave)
|
|
* - Code highlighting via highlight.js
|
|
*
|
|
* TODO:
|
|
* - Touch/swipe interactions
|
|
* - Presentation overview via keyboard shortcut
|
|
*
|
|
* @author Hakim El Hattab | http://hakim.se
|
|
* @version 1.0
|
|
*/
|
|
var Reveal = (function(){
|
|
|
|
var HORIZONTAL_SLIDES_SELECTOR = '#main>section',
|
|
VERTICAL_SLIDES_SELECTOR = 'section.present>section',
|
|
|
|
indexh = 0,
|
|
indexv = 0,
|
|
|
|
config = {},
|
|
dom = {};
|
|
|
|
/**
|
|
* Activates the main program logic.
|
|
*/
|
|
function initialize( options ) {
|
|
// Gather references to DOM elements
|
|
dom.controls = document.querySelector( '.controls' );
|
|
dom.controlsLeft = document.querySelector( '.controls .left' );
|
|
dom.controlsRight = document.querySelector( '.controls .right' );
|
|
dom.controlsUp = document.querySelector( '.controls .up' );
|
|
dom.controlsDown = document.querySelector( '.controls .down' );
|
|
|
|
// Add event listeners
|
|
document.addEventListener('keydown', onDocumentKeyDown, false);
|
|
document.addEventListener('touchstart', onDocumentTouchStart, false);
|
|
window.addEventListener('hashchange', onWindowHashChange, false);
|
|
dom.controlsLeft.addEventListener('click', preventAndForward( navigateLeft ), false);
|
|
dom.controlsRight.addEventListener('click', preventAndForward( navigateRight ), false);
|
|
dom.controlsUp.addEventListener('click', preventAndForward( navigateUp ), false);
|
|
dom.controlsDown.addEventListener('click', preventAndForward( navigateDown ), false);
|
|
|
|
// Default options
|
|
config.rollingLinks = options.rollingLinks === undefined ? true : options.rollingLinks;
|
|
config.controls = options.controls === undefined ? false : options.controls;
|
|
config.theme = options.theme === undefined ? 'default' : options.theme;
|
|
|
|
if( config.controls ) {
|
|
dom.controls.style.display = 'block';
|
|
}
|
|
|
|
if( config.theme !== 'default' ) {
|
|
document.body.classList.add( config.theme );
|
|
}
|
|
|
|
if( config.rollingLinks ) {
|
|
// Add some 3D magic to our anchors
|
|
linkify();
|
|
}
|
|
|
|
// Read the initial hash
|
|
readURL();
|
|
}
|
|
|
|
/**
|
|
* Prevents an events defaults behavior calls the
|
|
* specified delegate.
|
|
*/
|
|
function preventAndForward( delegate ) {
|
|
return function( event ) {
|
|
event.preventDefault();
|
|
delegate.call();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'keydown' event.
|
|
*
|
|
* @param {Object} event
|
|
*/
|
|
function onDocumentKeyDown( event ) {
|
|
|
|
if( event.keyCode >= 37 && event.keyCode <= 40 ) {
|
|
|
|
switch( event.keyCode ) {
|
|
case 37: navigateLeft(); break; // left
|
|
case 39: navigateRight(); break; // right
|
|
case 38: navigateUp(); break; // up
|
|
case 40: navigateDown(); break; // down
|
|
}
|
|
|
|
slide();
|
|
|
|
event.preventDefault();
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handler for the document level 'touchstart' event.
|
|
*
|
|
* This enables very basic tap interaction for touch
|
|
* devices. Added mainly for performance testing of 3D
|
|
* transforms on iOS but was so happily surprised with
|
|
* how smoothly it runs so I left it in here. Apple +1
|
|
*
|
|
* @param {Object} event
|
|
*/
|
|
function onDocumentTouchStart( event ) {
|
|
// We're only interested in one point taps
|
|
if (event.touches.length === 1) {
|
|
// Never prevent taps on anchors and images
|
|
if( event.target.tagName.toLowerCase() === 'a' || event.target.tagName.toLowerCase() === 'img' ) {
|
|
return;
|
|
}
|
|
|
|
event.preventDefault();
|
|
|
|
var point = {
|
|
x: event.touches[0].clientX,
|
|
y: event.touches[0].clientY
|
|
};
|
|
|
|
// 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 ) {
|
|
navigateLeft();
|
|
}
|
|
else if( point.x > window.innerWidth - wt ) {
|
|
navigateRight();
|
|
}
|
|
else if( point.y < ht ) {
|
|
navigateUp();
|
|
}
|
|
else if( point.y > window.innerHeight - ht ) {
|
|
navigateDown();
|
|
}
|
|
|
|
slide();
|
|
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Handler for the window level 'hashchange' event.
|
|
*
|
|
* @param {Object} event
|
|
*/
|
|
function onWindowHashChange( event ) {
|
|
readURL();
|
|
}
|
|
|
|
/**
|
|
* Wrap all links in 3D goodness.
|
|
*/
|
|
function linkify() {
|
|
var supports3DTransforms = document.body.style['webkitPerspective'] !== undefined ||
|
|
document.body.style['MozPerspective'] !== undefined ||
|
|
document.body.style['perspective'] !== undefined;
|
|
|
|
if( supports3DTransforms ) {
|
|
var nodes = document.querySelectorAll( 'section a:not(.image)' );
|
|
|
|
for( var i = 0, len = nodes.length; i < len; i++ ) {
|
|
var node = nodes[i];
|
|
|
|
if( !node.className || !node.className.match( /roll/g ) ) {
|
|
node.className += ' roll';
|
|
node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates one dimension of slides by showing the slide
|
|
* with the specified index.
|
|
*
|
|
* @param {String} selector A CSS selector that will fetch
|
|
* the group of slides we are working with
|
|
* @param {Number} index The index of the slide that should be
|
|
* shown
|
|
*
|
|
* @return {Number} The index of the slide that is now shown,
|
|
* might differ from the passed in index if it was out of
|
|
* bounds.
|
|
*/
|
|
function updateSlides( selector, index ) {
|
|
|
|
// Select all slides and convert the NodeList result to
|
|
// an array
|
|
var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) );
|
|
|
|
if( slides.length ) {
|
|
// Enforce max and minimum index bounds
|
|
index = Math.max(Math.min(index, slides.length - 1), 0);
|
|
|
|
slides[index].setAttribute('class', 'present');
|
|
|
|
// Any element previous to index is given the 'past' class
|
|
slides.slice(0, index).map(function(element){
|
|
element.setAttribute('class', 'past');
|
|
});
|
|
|
|
// Any element subsequent to index is given the 'future' class
|
|
slides.slice(index + 1).map(function(element){
|
|
element.setAttribute('class', 'future');
|
|
});
|
|
}
|
|
else {
|
|
// Since there are no slides we can't be anywhere beyond the
|
|
// zeroth index
|
|
index = 0;
|
|
}
|
|
|
|
return index;
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the visual slides to represent the currently
|
|
* set indices.
|
|
*/
|
|
function slide() {
|
|
indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, indexh );
|
|
indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, indexv );
|
|
|
|
updateControls();
|
|
|
|
writeURL();
|
|
}
|
|
|
|
/**
|
|
* Updates the state and link pointers of the controls.
|
|
*/
|
|
function updateControls() {
|
|
var routes = availableRoutes();
|
|
|
|
// Remove the 'enabled' class from all directions
|
|
[ dom.controlsLeft, dom.controlsRight, dom.controlsUp, dom.controlsDown ].forEach( function( node ) {
|
|
node.classList.remove( 'enabled' );
|
|
} )
|
|
|
|
if( routes.left ) dom.controlsLeft.classList.add( 'enabled' );
|
|
if( routes.right ) dom.controlsRight.classList.add( 'enabled' );
|
|
if( routes.up ) dom.controlsUp.classList.add( 'enabled' );
|
|
if( routes.down ) dom.controlsDown.classList.add( 'enabled' );
|
|
}
|
|
|
|
/**
|
|
* Determine what available routes there are for navigation.
|
|
*
|
|
* @return {Object} containing four booleans: left/right/up/down
|
|
*/
|
|
function availableRoutes() {
|
|
var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
|
|
var verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
|
|
|
|
return {
|
|
left: indexh > 0,
|
|
right: indexh < horizontalSlides.length - 1,
|
|
up: indexv > 0,
|
|
down: indexv < verticalSlides.length - 1
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Reads the current URL (hash) and navigates accordingly.
|
|
*/
|
|
function readURL() {
|
|
// Break the hash down to separate components
|
|
var bits = window.location.hash.slice(2).split('/');
|
|
|
|
// Read the index components of the hash
|
|
indexh = bits[0] ? parseInt( bits[0] ) : 0;
|
|
indexv = bits[1] ? parseInt( bits[1] ) : 0;
|
|
|
|
navigateTo( indexh, indexv );
|
|
}
|
|
|
|
/**
|
|
* Updates the page URL (hash) to reflect the current
|
|
* navigational state.
|
|
*/
|
|
function writeURL() {
|
|
var url = '/';
|
|
|
|
// Only include the minimum possible number of components in
|
|
// the URL
|
|
if( indexh > 0 || indexv > 0 ) url += indexh;
|
|
if( indexv > 0 ) url += '/' + indexv;
|
|
|
|
window.location.hash = url;
|
|
}
|
|
|
|
/**
|
|
* Navigate to the nexy slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a next fragment,
|
|
* false otherwise
|
|
*/
|
|
function nextFragment() {
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( verticalFragments.length ) {
|
|
verticalFragments[0].classList.add( 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( horizontalFragments.length ) {
|
|
horizontalFragments[0].classList.add( 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Navigate to the previous slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a previous fragment,
|
|
* false otherwise
|
|
*/
|
|
function previousFragment() {
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( verticalFragments.length ) {
|
|
verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( horizontalFragments.length ) {
|
|
horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Triggers a navigation to the specified indices.
|
|
*
|
|
* @param {Number} h The horizontal index of the slide to show
|
|
* @param {Number} v The vertical index of the slide to show
|
|
*/
|
|
function navigateTo( h, v ) {
|
|
indexh = h === undefined ? indexh : h;
|
|
indexv = v === undefined ? indexv : v;
|
|
|
|
slide();
|
|
}
|
|
|
|
function navigateLeft() {
|
|
// Prioritize hiding fragments
|
|
if( previousFragment() === false ) {
|
|
indexh --;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateRight() {
|
|
// Prioritize revealing fragments
|
|
if( nextFragment() === false ) {
|
|
indexh ++;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateUp() {
|
|
// Prioritize hiding fragments
|
|
if( previousFragment() === false ) {
|
|
indexv --;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateDown() {
|
|
// Prioritize revealing fragments
|
|
if( nextFragment() === false ) {
|
|
indexv ++;
|
|
slide();
|
|
}
|
|
}
|
|
|
|
// Expose some methods publicly
|
|
return {
|
|
initialize: initialize,
|
|
navigateTo: navigateTo,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
|
navigateDown: navigateDown
|
|
};
|
|
|
|
})();
|
|
|