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calibre-web/cps/static/js/reading/epub-progress.js

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/**
* waits until queue is finished, meaning the book is done loading
* @param callback
*/
function qFinished(callback){
let timeout=setInterval(()=>{
if(reader.rendition.q.running===undefined)
clearInterval(timeout);
callback();
},300
)
}
function calculateProgress(){
let data=reader.rendition.location.end;
return Math.round(epub.locations.percentageFromCfi(data.cfi)*100);
}
// register new event emitter locationchange that fires on urlchange
// source: https://stackoverflow.com/a/52809105/21941129
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(() => {
let oldPushState = history.pushState;
history.pushState = function pushState() {
let ret = oldPushState.apply(this, arguments);
window.dispatchEvent(new Event('locationchange'));
return ret;
};
let oldReplaceState = history.replaceState;
history.replaceState = function replaceState() {
let ret = oldReplaceState.apply(this, arguments);
window.dispatchEvent(new Event('locationchange'));
return ret;
};
window.addEventListener('popstate', () => {
window.dispatchEvent(new Event('locationchange'));
});
})();
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window.addEventListener('locationchange',()=>{
let newPos=calculateProgress();
progressDiv.textContent=newPos+"%";
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});
var epub=ePub(calibre.bookUrl)
let progressDiv=document.getElementById("progress");
qFinished(()=>{
epub.locations.generate().then(()=> {
window.dispatchEvent(new Event('locationchange'))
});
})