codimd/public/build/reveal.js/plugin/elapsed-time-bar/elapsed-time-bar.js

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var ElapsedTimeBar = {
// default value
barColor: 'rgb(200,0,0)',
pausedBarColor: 'rgba(200,0,0,.6)',
isPaused: false,
isFinished: false,
allottedTime: null,
timeProgressBar: null,
startTime: null,
pauseTime: null,
pauseTimeDuration: 0,
/**
* initialize elements
*/
handleReady() {
var config = Reveal.getConfig();
// activate this plugin if config.allottedTime exists.
if (!config.allottedTime) {
console.warn('Failed to start ElapsedTimeBar plugin. "allottedTime" property is required.');
return;
}
// set configurations
this.barColor = config.barColor || this.barColor;
this.pausedBarColor = config.pausedBarColor || this.pausedBarColor;
// calc barHeight from config.barHeight or page-progress container
var barHeight;
var pageProgressContainer = document.querySelector('.progress');
if (config.progressBarHeight) {
barHeight = parseInt(config.progressBarHeight, 10) + 'px';
// override height of page-progress container
pageProgressContainer && (pageProgressContainer.style.height = barHeight);
} else if (config.progress && pageProgressContainer) {
// get height from page-progress container
barHeight = pageProgressContainer.getBoundingClientRect().height + 'px';
} else {
// default
barHeight = '3px';
}
// create container of time-progress
var timeProgressContainer = document.createElement('div');
timeProgressContainer.classList.add('progress');
Object.entries({
display: 'block',
position: 'fixed',
bottom: config.progress ? barHeight : 0,
width: '100%',
height: barHeight
}).forEach(([k, v]) => {
timeProgressContainer.style[k] = v;
});
document.querySelector('.reveal').appendChild(timeProgressContainer);
// create content of time-progress
this.timeProgressBar = document.createElement('div');
Object.entries({
height: '100%',
willChange: 'width'
}).forEach(([k, v]) => {
this.timeProgressBar.style[k] = v;
});
timeProgressContainer.appendChild(this.timeProgressBar);
// start timer
this.start(config.allottedTime);
},
/**
* update repeatedly using requestAnimationFrame.
*/
loop() {
if (this.isPaused) return;
var now = +new Date();
var elapsedTime = now - this.startTime - this.pauseTimeDuration;
if (elapsedTime > this.allottedTime) {
this.timeProgressBar.style.width = '100%';
this.isFinished = true;
} else {
this.timeProgressBar.style.width = elapsedTime / this.allottedTime * 100 + '%';
requestAnimationFrame(this.loop.bind(this));
}
},
/**
* set color of progress bar
*/
setBarColor() {
if (this.isPaused) {
this.timeProgressBar.style.backgroundColor = this.pausedBarColor;
} else {
this.timeProgressBar.style.backgroundColor = this.barColor;
}
},
/**
* start(reset) timer with new allotted time.
* @param {number} allottedTime
* @param {number} [elapsedTime=0]
*/
start(allottedTime, elapsedTime = 0) {
this.isFinished = false;
this.isPaused = false;
this.allottedTime = allottedTime;
this.startTime = +new Date() - elapsedTime;
this.pauseTimeDuration = 0;
this.setBarColor();
this.loop();
},
reset() {
this.start(this.allottedTime);
},
pause() {
if (this.isPaused) return;
this.isPaused = true;
this.pauseTime = +new Date();
this.setBarColor();
},
resume() {
if (!this.isPaused) return;
// add paused time duration
this.isPaused = false;
this.pauseTimeDuration += new Date() - this.pauseTime;
this.pauseTime = null;
this.setBarColor();
this.loop();
}
};
if (Reveal.isReady()) {
ElapsedTimeBar.handleReady();
} else {
Reveal.addEventListener('ready', () => ElapsedTimeBar.handleReady());
}