691 lines
20 KiB
JavaScript
691 lines
20 KiB
JavaScript
/**
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* Copyright (C) 2011 Hakim El Hattab, http://hakim.se
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*
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* #############################################################################
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*
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*
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* Reveal.js is an easy to use HTML based slideshow enhanced by
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* sexy CSS 3D transforms.
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*
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* Slides are given unique hash based URL's so that they can be
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* opened directly.
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*
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* Public facing methods:
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* - Reveal.initialize( { ... options ... } );
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* - Reveal.navigateTo( indexh, indexv );
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* - Reveal.navigateLeft();
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* - Reveal.navigateRight();
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* - Reveal.navigateUp();
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* - Reveal.navigateDown();
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*
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*
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* version 0.1:
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* - First release
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*
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* version 0.2:
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* - Refactored code and added inline documentation
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* - Slides now have unique URL's
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* - A basic API to invoke navigation was added
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*
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* version 0.3:
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* - Added licensing terms
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* - Fixed broken links on touch devices
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*
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* version 1.0:
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* - Added controls
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* - Added initialization options
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* - Reveal views in fragments
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* - Revamped, darker, theme
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* - Tweaked markup styles (a, em, strong, b, i, blockquote, q, pre, ul, ol)
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* - Support for themes at initialization (default/linear/concave)
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* - Code highlighting via highlight.js
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*
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* version 1.1:
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* - Optional progress bar UI element
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* - Slide overview available via SPACE
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* - Added 'transition' option for specifying transition styles
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* - Added 'theme' option for specifying UI styles
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* - Slides that contain nested-slides are given the 'stack' class
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*
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* version 1.2:
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* - Big changes to DOM structure:
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* - Previous #main wrapper is now called #reveal
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* - Slides were moved one level deeper, into #reveal .slides
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* - Controls and progress bar were moved into #reveal
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* - All CSS is now much more explicit, rooted at #reveal, to prevent conflicts
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* - Config option for disabling updates to URL, defaults to true
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* - Removed dependency on classList
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*
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*
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* @author Hakim El Hattab | http://hakim.se
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* @version 1.2
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*/
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var Reveal = (function(){
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var HORIZONTAL_SLIDES_SELECTOR = '#reveal .slides>section',
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VERTICAL_SLIDES_SELECTOR = '#reveal .slides>section.present>section',
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// The horizontal and verical index of the currently active slide
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indexh = 0,
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indexv = 0,
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// Configurations options, can be overridden at initialization time
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config = {
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controls: false,
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progress: false,
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history: false,
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transition: 'default',
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theme: 'default',
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rollingLinks: true
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},
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// Cached references to DOM elements
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dom = {},
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// Detect support for CSS 3D transforms
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supports3DTransforms = document.body.style['perspectiveProperty'] !== undefined ||
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document.body.style['WebkitPerspective'] !== undefined ||
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document.body.style['MozPerspective'] !== undefined ||
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document.body.style['msPerspective'] !== undefined,
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supports2DTransforms = document.body.style['transformProperty'] !== undefined ||
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document.body.style['WebkitTransform'] !== undefined ||
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document.body.style['MozTransform'] !== undefined ||
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document.body.style['msTransform'] !== undefined ||
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document.body.style['OTransform'] !== undefined;
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/**
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* Starts up the slideshow by applying configuration
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* options and binding various events.
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*/
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function initialize( options ) {
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if( !supports2DTransforms && !supports3DTransforms ) {
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document.body.setAttribute( 'class', 'no-transforms' );
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// If the browser doesn't support transforms we won't be
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// using JavaScript to control the presentation
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return;
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}
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// Cache references to DOM elements
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dom.wrapper = document.querySelector( '#reveal' );
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dom.progress = document.querySelector( '#reveal .progress' );
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dom.progressbar = document.querySelector( '#reveal .progress span' );
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dom.controls = document.querySelector( '#reveal .controls' );
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dom.controlsLeft = document.querySelector( '#reveal .controls .left' );
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dom.controlsRight = document.querySelector( '#reveal .controls .right' );
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dom.controlsUp = document.querySelector( '#reveal .controls .up' );
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dom.controlsDown = document.querySelector( '#reveal .controls .down' );
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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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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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dom.controlsUp.addEventListener('click', preventAndForward( navigateUp ), false);
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dom.controlsDown.addEventListener('click', preventAndForward( navigateDown ), false);
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// Copy options over to our config object
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extend( config, options );
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// Fall back on the 2D transform theme 'linear'
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if( supports3DTransforms === false ) {
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config.transition = 'linear';
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}
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if( config.controls ) {
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dom.controls.style.display = 'block';
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}
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if( config.progress ) {
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dom.progress.style.display = 'block';
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}
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if( config.transition !== 'default' ) {
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addClass( dom.wrapper, config.transition );
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}
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if( config.theme !== 'default' ) {
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addClass( dom.wrapper, config.theme );
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}
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if( config.rollingLinks ) {
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// Add some 3D magic to our anchors
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linkify();
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}
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// Read the initial hash
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readURL();
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}
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/**
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* Extend object a with the properties of object b.
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* If there's a conflict, object b takes precedence.
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*/
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function extend( a, b ) {
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for( var i in b ) {
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a[ i ] = b[ i ];
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}
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}
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/**
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* Prevents an events defaults behavior calls the
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* specified delegate.
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*
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* @param {Function} delegate The method to call
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* after the wrapper has been executed
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*/
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function preventAndForward( delegate ) {
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return function( event ) {
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event.preventDefault();
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delegate.call();
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}
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}
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/**
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* Handler for the document level 'keydown' event.
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*
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* @param {Object} event
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*/
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function onDocumentKeyDown( event ) {
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// FFT: Use document.querySelector( ':focus' ) === null
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// instead of checking contentEditable?
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if( event.target.contentEditable === 'inherit' ) {
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if( event.keyCode >= 37 && event.keyCode <= 40 ) {
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switch( event.keyCode ) {
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case 37: navigateLeft(); break; // left
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case 39: navigateRight(); break; // right
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case 38: navigateUp(); break; // up
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case 40: navigateDown(); break; // down
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}
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slide();
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event.preventDefault();
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}
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// Space bar
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else if ( event.keyCode === 32 && supports3DTransforms ) {
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if( overviewIsActive() ) {
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deactivateOverview();
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}
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else {
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activateOverview();
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}
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event.preventDefault();
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}
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}
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}
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/**
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* Handler for the document level 'touchstart' event.
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*
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* This enables very basic tap interaction for touch
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* devices. Added mainly for performance testing of 3D
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* transforms on iOS but was so happily surprised with
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* how smoothly it runs so I left it in here. Apple +1
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*
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* @param {Object} event
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*/
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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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// Never prevent taps on anchors and images
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if( event.target.tagName.toLowerCase() === 'a' || event.target.tagName.toLowerCase() === 'img' ) {
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return;
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}
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event.preventDefault();
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var point = {
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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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// 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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navigateLeft();
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}
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else if( point.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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navigateUp();
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}
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else if( point.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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}
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/**
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* Handler for the window level 'hashchange' event.
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*
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* @param {Object} event
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*/
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function onWindowHashChange( event ) {
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readURL();
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}
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/**
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* Wrap all links in 3D goodness.
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*/
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function linkify() {
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if( supports3DTransforms ) {
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var nodes = document.querySelectorAll( '#reveal .slides section a:not(.image)' );
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for( var i = 0, len = nodes.length; i < len; i++ ) {
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var node = nodes[i];
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if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !hasClass( node, 'roll' ) ) ) {
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addClass( node, 'roll' );
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node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
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}
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};
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}
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}
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/**
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* Displays the overview of slides (quick nav) by
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* scaling down and arranging all slide elements.
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*
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* Experimental feature, might be dropped if perf
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* can't be improved.
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*/
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function activateOverview() {
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addClass( dom.wrapper, 'overview' );
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var horizontalSlides = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
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for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
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var hslide = horizontalSlides[i],
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htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
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hslide.setAttribute( 'data-index-h', i );
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hslide.style.display = 'block';
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hslide.style.WebkitTransform = htransform;
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hslide.style.MozTransform = htransform;
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hslide.style.msTransform = htransform;
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hslide.style.OTransform = htransform;
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hslide.style.transform = htransform;
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if( !hasClass( hslide, 'stack' ) ) {
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// Navigate to this slide on click
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hslide.addEventListener( 'click', onOverviewSlideClicked, true );
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}
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var verticalSlides = Array.prototype.slice.call( hslide.querySelectorAll( 'section' ) );
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for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
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var vslide = verticalSlides[j],
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vtransform = 'translate(0%, ' + ( ( j - indexv ) * 105 ) + '%)';
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vslide.setAttribute( 'data-index-h', i );
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vslide.setAttribute( 'data-index-v', j );
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vslide.style.display = 'block';
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vslide.style.WebkitTransform = vtransform;
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vslide.style.MozTransform = vtransform;
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vslide.style.msTransform = vtransform;
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vslide.style.OTransform = vtransform;
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vslide.style.transform = vtransform;
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// Navigate to this slide on click
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vslide.addEventListener( 'click', onOverviewSlideClicked, true );
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}
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}
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}
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/**
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* Exits the slide overview and enters the currently
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* active slide.
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*/
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function deactivateOverview() {
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removeClass( dom.wrapper, 'overview' );
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var slides = Array.prototype.slice.call( document.querySelectorAll( '#reveal .slides section' ) );
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for( var i = 0, len = slides.length; i < len; i++ ) {
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var element = slides[i];
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// Resets all transforms to use the external styles
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element.style.WebkitTransform = '';
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element.style.MozTransform = '';
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element.style.msTransform = '';
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element.style.OTransform = '';
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element.style.transform = '';
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element.removeEventListener( 'click', onOverviewSlideClicked );
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}
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slide();
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}
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/**
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* Checks if the overview is currently active.
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*
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* @return {Boolean} true if the overview is active,
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* false otherwise
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*/
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function overviewIsActive() {
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return hasClass( dom.wrapper, 'overview' );
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}
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/**
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* Invoked when a slide is and we're in the overview.
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*/
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function onOverviewSlideClicked( event ) {
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// TODO There's a bug here where the event listeners are not
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// removed after deactivating the overview.
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if( overviewIsActive() ) {
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event.preventDefault();
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deactivateOverview();
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indexh = this.getAttribute( 'data-index-h' );
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indexv = this.getAttribute( 'data-index-v' );
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slide();
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}
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}
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/**
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* Updates one dimension of slides by showing the slide
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* with the specified index.
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*
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* @param {String} selector A CSS selector that will fetch
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* the group of slides we are working with
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* @param {Number} index The index of the slide that should be
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* shown
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*
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* @return {Number} The index of the slide that is now shown,
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* might differ from the passed in index if it was out of
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* bounds.
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*/
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function updateSlides( selector, index ) {
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// Select all slides and convert the NodeList result to
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// an array
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var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) );
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if( slides.length ) {
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// Enforce max and minimum index bounds
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index = Math.max(Math.min(index, slides.length - 1), 0);
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slides[index].className = 'present';
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for( var i = 0; i < slides.length; i++ ) {
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var slide = slides[i];
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// Optimization; hide all slides that are three or more steps
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// away from the present slide
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if( overviewIsActive() === false ) {
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slide.style.display = Math.abs( index - i ) > 3 ? 'none' : 'block';
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}
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if( i < index ) {
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// Any element previous to index is given the 'past' class
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slide.className = 'past';
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}
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else if( i > index ) {
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// Any element subsequent to index is given the 'future' class
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slide.className = 'future';
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}
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// If this element contains vertical slides
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if( slide.querySelector( 'section' ) ) {
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addClass( slide, 'stack' );
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}
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}
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}
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else {
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// Since there are no slides we can't be anywhere beyond the
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// zeroth index
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index = 0;
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}
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return index;
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}
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/**
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* Updates the visual slides to represent the currently
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* set indices.
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*/
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function slide() {
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indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, indexh );
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indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, indexv );
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// Update progress if enabled
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if( config.progress ) {
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dom.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
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}
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// Close the overview if it's active
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if( overviewIsActive() ) {
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activateOverview();
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}
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updateControls();
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writeURL();
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}
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/**
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* Updates the state and link pointers of the controls.
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*/
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function updateControls() {
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var routes = availableRoutes();
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// Remove the 'enabled' class from all directions
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[ dom.controlsLeft, dom.controlsRight, dom.controlsUp, dom.controlsDown ].forEach( function( node ) {
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removeClass( node, 'enabled' );
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} )
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if( routes.left ) addClass( dom.controlsLeft, 'enabled' );
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if( routes.right ) addClass( dom.controlsRight, 'enabled' );
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if( routes.up ) addClass( dom.controlsUp, 'enabled' );
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if( routes.down ) addClass( dom.controlsDown, 'enabled' );
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}
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/**
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* Determine what available routes there are for navigation.
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*
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* @return {Object} containing four booleans: left/right/up/down
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*/
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function availableRoutes() {
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var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
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var verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
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return {
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left: indexh > 0,
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right: indexh < horizontalSlides.length - 1,
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up: indexv > 0,
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down: indexv < verticalSlides.length - 1
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};
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}
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/**
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* Reads the current URL (hash) and navigates accordingly.
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*/
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function readURL() {
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// Break the hash down to separate components
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var bits = window.location.hash.slice(2).split('/');
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// Read the index components of the hash
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indexh = bits[0] ? parseInt( bits[0] ) : 0;
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indexv = bits[1] ? parseInt( bits[1] ) : 0;
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navigateTo( indexh, indexv );
|
|
}
|
|
|
|
/**
|
|
* Updates the page URL (hash) to reflect the current
|
|
* state.
|
|
*/
|
|
function writeURL() {
|
|
if( config.history ) {
|
|
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 next slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a next fragment,
|
|
* false otherwise
|
|
*/
|
|
function nextFragment() {
|
|
// Vertical slides:
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( verticalFragments.length ) {
|
|
addClass( verticalFragments[0], 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
// Horizontal slides:
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
|
|
if( horizontalFragments.length ) {
|
|
addClass( horizontalFragments[0], 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Navigate to the previous slide fragment.
|
|
*
|
|
* @return {Boolean} true if there was a previous fragment,
|
|
* false otherwise
|
|
*/
|
|
function previousFragment() {
|
|
// Vertical slides:
|
|
if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
|
|
var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( verticalFragments.length ) {
|
|
removeClass( verticalFragments[ verticalFragments.length - 1 ], 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
// Horizontal slides:
|
|
else {
|
|
var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
|
|
if( horizontalFragments.length ) {
|
|
removeClass( horizontalFragments[ horizontalFragments.length - 1 ], 'visible' );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
function hasClass( node, klass ) {
|
|
return !!node.className.match( klass );
|
|
}
|
|
|
|
function addClass( node, klass ) {
|
|
if( !hasClass( node, klass ) ) {
|
|
node.className += ' ' + klass;
|
|
}
|
|
}
|
|
|
|
function removeClass( node, klass ) {
|
|
node.className = node.className.replace( klass, '' );
|
|
}
|
|
|
|
/**
|
|
* 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( overviewIsActive() || previousFragment() === false ) {
|
|
indexh --;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateRight() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || nextFragment() === false ) {
|
|
indexh ++;
|
|
indexv = 0;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateUp() {
|
|
// Prioritize hiding fragments
|
|
if( overviewIsActive() || previousFragment() === false ) {
|
|
indexv --;
|
|
slide();
|
|
}
|
|
}
|
|
function navigateDown() {
|
|
// Prioritize revealing fragments
|
|
if( overviewIsActive() || nextFragment() === false ) {
|
|
indexv ++;
|
|
slide();
|
|
}
|
|
}
|
|
|
|
// Expose some methods publicly
|
|
return {
|
|
initialize: initialize,
|
|
navigateTo: navigateTo,
|
|
navigateLeft: navigateLeft,
|
|
navigateRight: navigateRight,
|
|
navigateUp: navigateUp,
|
|
navigateDown: navigateDown
|
|
};
|
|
|
|
})();
|
|
|