zoom.js integration via alt+click
This commit is contained in:
Hakim El Hattab
parent
25efef8c4f
commit
91e9457cef
@ -90,9 +90,9 @@
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</section>
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</section>
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<section>
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<section>
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<h2>Holistic Overview</h2>
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<h2>Point of View</h2>
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<p>
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<p>
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Press <strong>ESC</strong> to enter the slide overview!
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Press <strong>ESC</strong> to enter the slide overview. Hold down alt and click on any element to zoom in on it using <a href="http://lab.hakim.se/zoom-js">zoom.js</a>.
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</p>
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</p>
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</section>
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</section>
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@ -263,8 +263,8 @@ function linkify( selector ) {
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<section>
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<section>
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<h2>Spectacular image!</h2>
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<h2>Spectacular image!</h2>
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<a class="image" href="http://hakim.se/experiments/html5/breakdom/" target="_blank">
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<a class="image" href="http://lab.hakim.se/meny/" target="_blank">
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<img width="320" height="412" src="https://s3.amazonaws.com/hakim-static/reveal-js/breakdom.png" alt="BreakDOM game screenshot">
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<img width="320" height="299" src="http://s3.amazonaws.com/hakim-static/portfolio/images/meny.png" alt="Meny">
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</a>
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</a>
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</section>
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</section>
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@ -342,6 +342,7 @@ function linkify( selector ) {
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{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
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{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
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{ src: 'lib/js/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'lib/js/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'lib/js/data-markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'lib/js/data-markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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{ src: 'lib/js/zoom.js', condition: function() { return !!document.body.classList; } },
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{ src: '/socket.io/socket.io.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } },
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{ src: '/socket.io/socket.io.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } },
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{ src: 'plugin/speakernotes/client.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } }
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{ src: 'plugin/speakernotes/client.js', async: true, condition: function() { return window.location.host === 'localhost:1947'; } }
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]
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]
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257
lib/js/zoom.js
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257
lib/js/zoom.js
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@ -0,0 +1,257 @@
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/*!
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* zoom.js 0.2 (modified version for use with reveal.js)
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* http://lab.hakim.se/zoom-js
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* MIT licensed
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*
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* Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
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*/
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var zoom = (function(){
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// The current zoom level (scale)
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var level = 1;
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// The current mouse position, used for panning
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var mouseX = 0,
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mouseY = 0;
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// Timeout before pan is activated
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var panEngageTimeout = -1,
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panUpdateInterval = -1;
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var currentOptions = null;
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// Check for transform support so that we can fallback otherwise
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var supportsTransforms = 'WebkitTransform' in document.body.style ||
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'MozTransform' in document.body.style ||
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'msTransform' in document.body.style ||
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'OTransform' in document.body.style ||
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'transform' in document.body.style;
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if( supportsTransforms ) {
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// The easing that will be applied when we zoom in/out
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document.body.style.transition = 'transform 0.8s ease';
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document.body.style.OTransition = '-o-transform 0.8s ease';
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document.body.style.msTransition = '-ms-transform 0.8s ease';
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document.body.style.MozTransition = '-moz-transform 0.8s ease';
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document.body.style.WebkitTransition = '-webkit-transform 0.8s ease';
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}
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// Zoom out if the user hits escape
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document.addEventListener( 'keyup', function( event ) {
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if( level !== 1 && event.keyCode === 27 ) {
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zoom.out();
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}
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} );
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// Monitor mouse movement for panning
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document.addEventListener( 'mousemove', function( event ) {
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if( level !== 1 ) {
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mouseX = event.clientX;
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mouseY = event.clientY;
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}
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} );
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/**
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* Applies the CSS required to zoom in, prioritizes use of CSS3
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* transforms but falls back on zoom for IE.
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*
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* @param {Number} pageOffsetX
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* @param {Number} pageOffsetY
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* @param {Number} elementOffsetX
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* @param {Number} elementOffsetY
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* @param {Number} scale
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*/
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function magnify( pageOffsetX, pageOffsetY, elementOffsetX, elementOffsetY, scale ) {
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if( supportsTransforms ) {
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var origin = pageOffsetX +'px '+ pageOffsetY +'px',
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transform = 'translate('+ -elementOffsetX +'px,'+ -elementOffsetY +'px) scale('+ scale +')';
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document.body.style.transformOrigin = origin;
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document.body.style.OTransformOrigin = origin;
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document.body.style.msTransformOrigin = origin;
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document.body.style.MozTransformOrigin = origin;
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document.body.style.WebkitTransformOrigin = origin;
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document.body.style.transform = transform;
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document.body.style.OTransform = transform;
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document.body.style.msTransform = transform;
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document.body.style.MozTransform = transform;
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document.body.style.WebkitTransform = transform;
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}
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else {
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// Reset all values
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if( scale === 1 ) {
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document.body.style.position = '';
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document.body.style.left = '';
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document.body.style.top = '';
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document.body.style.width = '';
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document.body.style.height = '';
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document.body.style.zoom = '';
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}
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// Apply scale
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else {
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document.body.style.position = 'relative';
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document.body.style.left = ( - ( pageOffsetX + elementOffsetX ) / scale ) + 'px';
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document.body.style.top = ( - ( pageOffsetY + elementOffsetY ) / scale ) + 'px';
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document.body.style.width = ( scale * 100 ) + '%';
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document.body.style.height = ( scale * 100 ) + '%';
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document.body.style.zoom = scale;
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}
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}
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level = scale;
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}
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/**
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* Pan the document when the mosue cursor approaches the edges
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* of the window.
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*/
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function pan() {
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var range = 0.12,
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rangeX = window.innerWidth * range,
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rangeY = window.innerHeight * range,
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scrollOffset = getScrollOffset();
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// Up
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if( mouseY < rangeY ) {
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window.scroll( scrollOffset.x, scrollOffset.y - ( 1 - ( mouseY / rangeY ) ) * ( 14 / level ) );
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}
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// Down
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else if( mouseY > window.innerHeight - rangeY ) {
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window.scroll( scrollOffset.x, scrollOffset.y + ( 1 - ( window.innerHeight - mouseY ) / rangeY ) * ( 14 / level ) );
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}
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// Left
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if( mouseX < rangeX ) {
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window.scroll( scrollOffset.x - ( 1 - ( mouseX / rangeX ) ) * ( 14 / level ), scrollOffset.y );
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}
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// Right
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else if( mouseX > window.innerWidth - rangeX ) {
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window.scroll( scrollOffset.x + ( 1 - ( window.innerWidth - mouseX ) / rangeX ) * ( 14 / level ), scrollOffset.y );
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}
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}
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function getScrollOffset() {
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return {
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x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
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y: window.scrollY !== undefined ? window.scrollY : window.pageXYffset
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}
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}
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return {
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/**
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* Zooms in on either a rectangle or HTML element.
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*
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* @param {Object} options
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* - element: HTML element to zoom in on
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* OR
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* - x/y: coordinates in non-transformed space to zoom in on
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* - width/height: the portion of the screen to zoom in on
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* - scale: can be used instead of width/height to explicitly set scale
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*/
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to: function( options ) {
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// Due to an implementation limitation we can't zoom in
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// to another element without zooming out first
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if( level !== 1 ) {
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zoom.out();
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}
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else {
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options.x = options.x || 0;
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options.y = options.y || 0;
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// If an element is set, that takes precedence
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if( !!options.element ) {
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// Space around the zoomed in element to leave on screen
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var padding = 20;
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options.width = options.element.getBoundingClientRect().width + ( padding * 2 );
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options.height = options.element.getBoundingClientRect().height + ( padding * 2 );
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options.x = options.element.getBoundingClientRect().left - padding;
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options.y = options.element.getBoundingClientRect().top - padding;
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}
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// If width/height values are set, calculate scale from those values
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if( options.width !== undefined && options.height !== undefined ) {
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options.scale = Math.max( Math.min( window.innerWidth / options.width, window.innerHeight / options.height ), 1 );
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}
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if( options.scale > 1 ) {
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options.x *= options.scale;
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options.y *= options.scale;
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var scrollOffset = getScrollOffset();
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if( options.element ) {
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scrollOffset.x -= ( window.innerWidth - ( options.width * options.scale ) ) / 2;
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}
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magnify( scrollOffset.x, scrollOffset.y, options.x, options.y, options.scale );
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if( options.pan !== false ) {
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// Wait with engaging panning as it may conflict with the
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// zoom transition
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panEngageTimeout = setTimeout( function() {
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panUpdateInterval = setInterval( pan, 1000 / 60 );
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}, 800 );
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}
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}
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currentOptions = options;
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}
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},
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/**
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* Resets the document zoom state to its default.
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*/
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out: function() {
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clearTimeout( panEngageTimeout );
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clearInterval( panUpdateInterval );
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var scrollOffset = getScrollOffset();
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if( currentOptions && currentOptions.element ) {
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scrollOffset.x -= ( window.innerWidth - ( currentOptions.width * currentOptions.scale ) ) / 2;
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}
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magnify( scrollOffset.x, scrollOffset.y, 0, 0, 1 );
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level = 1;
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},
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// Alias
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magnify: function( options ) { this.to( options ) },
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reset: function() { this.out() },
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zoomLevel: function() {
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return level;
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}
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}
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})();
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// Custom reveal.js integration
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(function(){
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var modifierIsActive = false;
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function updateKeyFlag( event ) {
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modifierIsActive = event.altKey;
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}
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document.addEventListener( 'keypress', updateKeyFlag, false );
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document.addEventListener( 'keydown', updateKeyFlag, false );
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document.addEventListener( 'keyup', updateKeyFlag, false );
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document.querySelector( '.reveal' ).addEventListener( 'click', function( event ) {
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if( modifierIsActive ) {
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event.preventDefault();
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zoom.to({ element: event.target, pan: false });
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}
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} );
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})();
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