zoom viewport is centered on target element #900
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Hakim El Hattab
parent
c974756326
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b558f74299
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@ -16,11 +16,11 @@
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})();
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/*!
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* zoom.js 0.2 (modified version for use with reveal.js)
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* zoom.js 0.3 (modified 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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* Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
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*/
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var zoom = (function(){
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@ -35,8 +35,6 @@ var zoom = (function(){
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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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@ -58,7 +56,7 @@ var zoom = (function(){
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if( level !== 1 && event.keyCode === 27 ) {
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zoom.out();
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}
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}, false );
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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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@ -66,38 +64,56 @@ var zoom = (function(){
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mouseX = event.clientX;
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mouseY = event.clientY;
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}
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}, false );
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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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* Applies the CSS required to zoom in, prefers the 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 {Object} rect
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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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function magnify( rect, scale ) {
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var scrollOffset = getScrollOffset();
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// Ensure a width/height is set
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rect.width = rect.width || 1;
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rect.height = rect.height || 1;
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// Center the rect within the zoomed viewport
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rect.x -= ( window.innerWidth - ( rect.width * scale ) ) / 2;
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rect.y -= ( window.innerHeight - ( rect.height * scale ) ) / 2;
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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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// Reset
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if( scale === 1 ) {
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document.body.style.transform = '';
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document.body.style.OTransform = '';
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document.body.style.msTransform = '';
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document.body.style.MozTransform = '';
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document.body.style.WebkitTransform = '';
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}
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// Scale
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else {
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var origin = scrollOffset.x +'px '+ scrollOffset.y +'px',
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transform = 'translate('+ -rect.x +'px,'+ -rect.y +'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.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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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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}
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else {
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// Reset all values
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// Reset
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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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@ -106,11 +122,11 @@ var zoom = (function(){
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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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// 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.left = ( - ( scrollOffset.x + rect.x ) / scale ) + 'px';
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document.body.style.top = ( - ( scrollOffset.y + rect.y ) / 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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@ -119,11 +135,13 @@ var zoom = (function(){
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level = scale;
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if( level !== 1 && document.documentElement.classList ) {
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document.documentElement.classList.add( 'zoomed' );
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}
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else {
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document.documentElement.classList.remove( 'zoomed' );
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if( document.documentElement.classList ) {
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if( level !== 1 ) {
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document.documentElement.classList.add( 'zoomed' );
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}
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else {
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document.documentElement.classList.remove( 'zoomed' );
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}
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}
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}
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@ -159,7 +177,7 @@ var zoom = (function(){
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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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y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
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}
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}
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@ -175,6 +193,7 @@ var zoom = (function(){
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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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@ -188,11 +207,12 @@ var zoom = (function(){
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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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var bounds = options.element.getBoundingClientRect();
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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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options.x = bounds.left - padding;
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options.y = bounds.top - padding;
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options.width = bounds.width + ( padding * 2 );
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options.height = bounds.height + ( padding * 2 );
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}
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// If width/height values are set, calculate scale from those values
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@ -204,13 +224,7 @@ var zoom = (function(){
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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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magnify( options, options.scale );
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if( options.pan !== false ) {
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@ -222,8 +236,6 @@ var zoom = (function(){
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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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@ -234,13 +246,7 @@ var zoom = (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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magnify( { x: 0, y: 0 }, 1 );
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level = 1;
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},
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@ -256,3 +262,5 @@ var zoom = (function(){
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})();
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