make view distance configurable #527
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15
js/reveal.js
15
js/reveal.js
@ -85,6 +85,9 @@ var Reveal = (function(){
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// Transition style for full page slide backgrounds
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backgroundTransition: 'default', // default/linear/none
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// Number of slides away from the current that are visible
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viewDistance: 3,
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// Script dependencies to load
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dependencies: []
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},
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@ -1583,15 +1586,15 @@ var Reveal = (function(){
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// The number of steps away from the present slide that will
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// be visible
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var threshold = 3;
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var viewDistance = config.viewDistance;
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// Heavily limited on weaker devices
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if( isMobileDevice ) {
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threshold = 1;
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viewDistance = 1;
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}
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if( isOverview() ) {
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threshold = 6;
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viewDistance = 6;
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}
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for( var x = 0; x < horizontalSlidesLength; x++ ) {
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@ -1614,16 +1617,16 @@ var Reveal = (function(){
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distance = Math.sqrt( dx*dx + dy*dy );
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verticalSlide.style.display = distance > threshold ? 'none' : 'block';
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verticalSlide.style.display = distance > viewDistance ? 'none' : 'block';
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}
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}
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else {
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// Loops so that it measures 1 between the first and last slides
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distance = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - threshold ) ) || 0;
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distance = Math.abs( ( indexh - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;
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horizontalSlide.style.display = distance > threshold ? 'none' : 'block';
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horizontalSlide.style.display = distance > viewDistance ? 'none' : 'block';
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}
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}
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4
js/reveal.min.js
vendored
4
js/reveal.min.js
vendored
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