zoom viewport is centered on target element #900
This commit is contained in:
Hakim El Hattab
parent
c974756326
commit
b558f74299
|
|
@ -16,11 +16,11 @@
|
|||
})();
|
||||
|
||||
/*!
|
||||
* zoom.js 0.2 (modified version for use with reveal.js)
|
||||
* zoom.js 0.3 (modified for use with reveal.js)
|
||||
* http://lab.hakim.se/zoom-js
|
||||
* MIT licensed
|
||||
*
|
||||
* Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
|
||||
* Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
|
||||
*/
|
||||
var zoom = (function(){
|
||||
|
||||
|
|
@ -35,8 +35,6 @@ var zoom = (function(){
|
|||
var panEngageTimeout = -1,
|
||||
panUpdateInterval = -1;
|
||||
|
||||
var currentOptions = null;
|
||||
|
||||
// Check for transform support so that we can fallback otherwise
|
||||
var supportsTransforms = 'WebkitTransform' in document.body.style ||
|
||||
'MozTransform' in document.body.style ||
|
||||
|
|
@ -58,7 +56,7 @@ var zoom = (function(){
|
|||
if( level !== 1 && event.keyCode === 27 ) {
|
||||
zoom.out();
|
||||
}
|
||||
}, false );
|
||||
} );
|
||||
|
||||
// Monitor mouse movement for panning
|
||||
document.addEventListener( 'mousemove', function( event ) {
|
||||
|
|
@ -66,38 +64,56 @@ var zoom = (function(){
|
|||
mouseX = event.clientX;
|
||||
mouseY = event.clientY;
|
||||
}
|
||||
}, false );
|
||||
} );
|
||||
|
||||
/**
|
||||
* Applies the CSS required to zoom in, prioritizes use of CSS3
|
||||
* Applies the CSS required to zoom in, prefers the use of CSS3
|
||||
* transforms but falls back on zoom for IE.
|
||||
*
|
||||
* @param {Number} pageOffsetX
|
||||
* @param {Number} pageOffsetY
|
||||
* @param {Number} elementOffsetX
|
||||
* @param {Number} elementOffsetY
|
||||
* @param {Object} rect
|
||||
* @param {Number} scale
|
||||
*/
|
||||
function magnify( pageOffsetX, pageOffsetY, elementOffsetX, elementOffsetY, scale ) {
|
||||
function magnify( rect, scale ) {
|
||||
|
||||
var scrollOffset = getScrollOffset();
|
||||
|
||||
// Ensure a width/height is set
|
||||
rect.width = rect.width || 1;
|
||||
rect.height = rect.height || 1;
|
||||
|
||||
// Center the rect within the zoomed viewport
|
||||
rect.x -= ( window.innerWidth - ( rect.width * scale ) ) / 2;
|
||||
rect.y -= ( window.innerHeight - ( rect.height * scale ) ) / 2;
|
||||
|
||||
if( supportsTransforms ) {
|
||||
var origin = pageOffsetX +'px '+ pageOffsetY +'px',
|
||||
transform = 'translate('+ -elementOffsetX +'px,'+ -elementOffsetY +'px) scale('+ scale +')';
|
||||
// Reset
|
||||
if( scale === 1 ) {
|
||||
document.body.style.transform = '';
|
||||
document.body.style.OTransform = '';
|
||||
document.body.style.msTransform = '';
|
||||
document.body.style.MozTransform = '';
|
||||
document.body.style.WebkitTransform = '';
|
||||
}
|
||||
// Scale
|
||||
else {
|
||||
var origin = scrollOffset.x +'px '+ scrollOffset.y +'px',
|
||||
transform = 'translate('+ -rect.x +'px,'+ -rect.y +'px) scale('+ scale +')';
|
||||
|
||||
document.body.style.transformOrigin = origin;
|
||||
document.body.style.OTransformOrigin = origin;
|
||||
document.body.style.msTransformOrigin = origin;
|
||||
document.body.style.MozTransformOrigin = origin;
|
||||
document.body.style.WebkitTransformOrigin = origin;
|
||||
document.body.style.transformOrigin = origin;
|
||||
document.body.style.OTransformOrigin = origin;
|
||||
document.body.style.msTransformOrigin = origin;
|
||||
document.body.style.MozTransformOrigin = origin;
|
||||
document.body.style.WebkitTransformOrigin = origin;
|
||||
|
||||
document.body.style.transform = transform;
|
||||
document.body.style.OTransform = transform;
|
||||
document.body.style.msTransform = transform;
|
||||
document.body.style.MozTransform = transform;
|
||||
document.body.style.WebkitTransform = transform;
|
||||
document.body.style.transform = transform;
|
||||
document.body.style.OTransform = transform;
|
||||
document.body.style.msTransform = transform;
|
||||
document.body.style.MozTransform = transform;
|
||||
document.body.style.WebkitTransform = transform;
|
||||
}
|
||||
}
|
||||
else {
|
||||
// Reset all values
|
||||
// Reset
|
||||
if( scale === 1 ) {
|
||||
document.body.style.position = '';
|
||||
document.body.style.left = '';
|
||||
|
|
@ -106,11 +122,11 @@ var zoom = (function(){
|
|||
document.body.style.height = '';
|
||||
document.body.style.zoom = '';
|
||||
}
|
||||
// Apply scale
|
||||
// Scale
|
||||
else {
|
||||
document.body.style.position = 'relative';
|
||||
document.body.style.left = ( - ( pageOffsetX + elementOffsetX ) / scale ) + 'px';
|
||||
document.body.style.top = ( - ( pageOffsetY + elementOffsetY ) / scale ) + 'px';
|
||||
document.body.style.left = ( - ( scrollOffset.x + rect.x ) / scale ) + 'px';
|
||||
document.body.style.top = ( - ( scrollOffset.y + rect.y ) / scale ) + 'px';
|
||||
document.body.style.width = ( scale * 100 ) + '%';
|
||||
document.body.style.height = ( scale * 100 ) + '%';
|
||||
document.body.style.zoom = scale;
|
||||
|
|
@ -119,11 +135,13 @@ var zoom = (function(){
|
|||
|
||||
level = scale;
|
||||
|
||||
if( level !== 1 && document.documentElement.classList ) {
|
||||
document.documentElement.classList.add( 'zoomed' );
|
||||
}
|
||||
else {
|
||||
document.documentElement.classList.remove( 'zoomed' );
|
||||
if( document.documentElement.classList ) {
|
||||
if( level !== 1 ) {
|
||||
document.documentElement.classList.add( 'zoomed' );
|
||||
}
|
||||
else {
|
||||
document.documentElement.classList.remove( 'zoomed' );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -159,7 +177,7 @@ var zoom = (function(){
|
|||
function getScrollOffset() {
|
||||
return {
|
||||
x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
|
||||
y: window.scrollY !== undefined ? window.scrollY : window.pageXYffset
|
||||
y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -175,6 +193,7 @@ var zoom = (function(){
|
|||
* - scale: can be used instead of width/height to explicitly set scale
|
||||
*/
|
||||
to: function( options ) {
|
||||
|
||||
// Due to an implementation limitation we can't zoom in
|
||||
// to another element without zooming out first
|
||||
if( level !== 1 ) {
|
||||
|
|
@ -188,11 +207,12 @@ var zoom = (function(){
|
|||
if( !!options.element ) {
|
||||
// Space around the zoomed in element to leave on screen
|
||||
var padding = 20;
|
||||
var bounds = options.element.getBoundingClientRect();
|
||||
|
||||
options.width = options.element.getBoundingClientRect().width + ( padding * 2 );
|
||||
options.height = options.element.getBoundingClientRect().height + ( padding * 2 );
|
||||
options.x = options.element.getBoundingClientRect().left - padding;
|
||||
options.y = options.element.getBoundingClientRect().top - padding;
|
||||
options.x = bounds.left - padding;
|
||||
options.y = bounds.top - padding;
|
||||
options.width = bounds.width + ( padding * 2 );
|
||||
options.height = bounds.height + ( padding * 2 );
|
||||
}
|
||||
|
||||
// If width/height values are set, calculate scale from those values
|
||||
|
|
@ -204,13 +224,7 @@ var zoom = (function(){
|
|||
options.x *= options.scale;
|
||||
options.y *= options.scale;
|
||||
|
||||
var scrollOffset = getScrollOffset();
|
||||
|
||||
if( options.element ) {
|
||||
scrollOffset.x -= ( window.innerWidth - ( options.width * options.scale ) ) / 2;
|
||||
}
|
||||
|
||||
magnify( scrollOffset.x, scrollOffset.y, options.x, options.y, options.scale );
|
||||
magnify( options, options.scale );
|
||||
|
||||
if( options.pan !== false ) {
|
||||
|
||||
|
|
@ -222,8 +236,6 @@ var zoom = (function(){
|
|||
|
||||
}
|
||||
}
|
||||
|
||||
currentOptions = options;
|
||||
}
|
||||
},
|
||||
|
||||
|
|
@ -234,13 +246,7 @@ var zoom = (function(){
|
|||
clearTimeout( panEngageTimeout );
|
||||
clearInterval( panUpdateInterval );
|
||||
|
||||
var scrollOffset = getScrollOffset();
|
||||
|
||||
if( currentOptions && currentOptions.element ) {
|
||||
scrollOffset.x -= ( window.innerWidth - ( currentOptions.width * currentOptions.scale ) ) / 2;
|
||||
}
|
||||
|
||||
magnify( scrollOffset.x, scrollOffset.y, 0, 0, 1 );
|
||||
magnify( { x: 0, y: 0 }, 1 );
|
||||
|
||||
level = 1;
|
||||
},
|
||||
|
|
@ -256,3 +262,5 @@ var zoom = (function(){
|
|||
|
||||
})();
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user