Notes: Introduce alternate pacing timer, based on total presentation time
The current pacing timer operates on the assumption that there is a default amount of time to be allocated to each slide, and that individual slides can deviate from that default by specifying their own data-timing attribute. This patch introduces an alternate pacing method: by specifying the totalTime configuration option, the presenter can set the total time available to present. The pacing timer will then continue to allocate the exact pacing time for slides that do have data-timing set, as before. However, rather than applying the defaultTiming constant to all others, it will - Add up the time already allocated to slides via data-timing; - subtract that from totalTime; - divide the difference by the number of slides without data-timing set; - apply the thus-calculated average to those slides. totalTime has no default, and if both defaultTiming and totalTime are set, totalTime wins. This preserves backward compatibility: if a presenter has set defaultTiming and updates reveal.js, totalTime will be null and defaultTiming is still applied to all slides without a data-timing attribute. The presenter can then switch to the automatic calculation, if desired, by setting a value for totalTime.
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2 changed files with 24 additions and 4 deletions
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@ -340,6 +340,12 @@ Reveal.initialize({
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// speaker view
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// speaker view
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defaultTiming: 120,
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defaultTiming: 120,
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// Specify the total time in seconds that is available to
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// present. If this is set to a nonzero value, the pacing
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// timer will work out the time available for each slide,
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// instead of using the defaultTiming value
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totalTime: 0,
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// Enable slide navigation via mouse wheel
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// Enable slide navigation via mouse wheel
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mouseWheel: false,
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mouseWheel: false,
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@ -1228,7 +1234,7 @@ The speaker notes window will also show:
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- Current wall-clock time
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- Current wall-clock time
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- (Optionally) a pacing timer which indicates whether the current pace of the presentation is on track for the right timing (shown in green), and if not, whether the presenter should speed up (shown in red) or has the luxury of slowing down (blue).
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- (Optionally) a pacing timer which indicates whether the current pace of the presentation is on track for the right timing (shown in green), and if not, whether the presenter should speed up (shown in red) or has the luxury of slowing down (blue).
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The pacing timer can be enabled by configuring by the `defaultTiming` parameter in the `Reveal` configuration block, which specifies the number of seconds per slide. 120 can be a reasonable rule of thumb. Timings can also be given per slide `<section>` by setting the `data-timing` attribute. Both values are in numbers of seconds.
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The pacing timer can be enabled by configuring the `defaultTiming` parameter in the `Reveal` configuration block, which specifies the number of seconds per slide. 120 can be a reasonable rule of thumb. Alternatively, you can enable the timer by setting `totalTime`, which sets the total length of your presentation (also in seconds). If both values are specified, `totalTime` wins and `defaultTiming` is ignored. Regardless of the baseline timing method, timings can also be given per slide `<section>` by setting the `data-timing` attribute (again, in seconds).
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## Server Side Speaker Notes
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## Server Side Speaker Notes
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@ -539,12 +539,16 @@
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callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
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callRevealApi( 'getSlidesAttributes', [], function ( slideAttributes ) {
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callRevealApi( 'getConfig', [], function ( config ) {
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callRevealApi( 'getConfig', [], function ( config ) {
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var totalTime = config.totalTime;
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var defaultTiming = config.defaultTiming;
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var defaultTiming = config.defaultTiming;
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if (defaultTiming == null) {
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if ((defaultTiming == null) && (totalTime == null)) {
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callback(null);
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callback(null);
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return;
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return;
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}
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}
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// Setting totalTime overrides defaultTiming
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if (totalTime) {
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defaultTiming = 0;
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}
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var timings = [];
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var timings = [];
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for ( var i in slideAttributes ) {
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for ( var i in slideAttributes ) {
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var slide = slideAttributes[ i ];
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var slide = slideAttributes[ i ];
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@ -559,7 +563,17 @@
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}
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}
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timings.push(timing);
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timings.push(timing);
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}
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}
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if ( totalTime ) {
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// After we've allocated time to individual slides, we summarize it and
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// subtract it from the total time
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var remainingTime = totalTime - timings.reduce( function(a, b) { return a + b; }, 0 );
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// The remaining time is divided by the number of slides that have 0 seconds
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// allocated at the moment, giving the average time-per-slide on the remaining slides
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var remainingSlides = (timings.filter( function(x) { return x == 0 }) ).length
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var timePerSlide = Math.round( remainingTime / remainingSlides, 0 )
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// And now we replace every zero-value timing with that average
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timings = timings.map( function(x) { return (x==0 ? timePerSlide : x) } );
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}
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callback( timings );
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callback( timings );
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} );
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} );
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} );
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} );
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