openmedialibrary/static/reader/epub.js

"use strict";
var reader;
var id = document.location.pathname.split('/')[1];
var annotations = JSON.parse(localStorage[id + '.annotations'] || '[]')
var currentSelection;
var fontSize = parseInt(localStorage.epubFontSize || '100', 10)

Ox.load({
    'UI': {
        loadCSS: false
    }
}, function() {
    Ox.$parent.bindMessage(function(data, event) {
        console.log('got', event, 'data', data)
        if (event == 'selectAnnotation') {
            selectAnnotation(data.id)
            var annotation = annotations.filter(function(a) { return a.id == data.id })[0]
            if (annotation) {
                reader.rendition.display(annotation.cfiRange)
            }
        }
    })
    setTimeout(function() {
        annotations.forEach(function(a) {
            Ox.$parent.postMessage('addAnnotation', a)
        })
    }, 1000)
})

function saveAnnotations() {
    localStorage[id + '.annotations'] = JSON.stringify(annotations)
}

function addAnnotation(annotation) {
    annotations.push(annotation)
    Ox.$parent.postMessage('addAnnotation', annotation)
    saveAnnotations()
}

function selectAnnotation(id) {
    $('.epubjs-hl.selected').each(function(i, g) {
        g.classList.remove('selected')
    })
    $('.epubjs-hl[data-id='+id+']').each(function(i, g) {
        g.classList.add('selected')
    })
}

function deselectAnnotation(id) {
    $('.epubjs-hl[data-id='+id+']').each(function(i, g) {
        g.classList.remove('selected')
    })
}

function removeAnnotation(a) {
    annotations = annotations.filter(function(annotation) {
        return annotation.cfiRange != a.dataset.epubcfi
    })
    reader.rendition.annotations.remove(a.dataset.epubcfi)
    saveAnnotations()
}

function getText(book, cfiRange, cb) {
    book.getRange(cfiRange).then(function (range) {
        var text;
        if (range) {
            text = range.toString();
        }
        cb(text)
    })
}

function onHighlightClicked(e) {
    console.log("highlight clicked", e.target.dataset.epubcfi);
    if(e.target.classList.contains('selected')) {
        e.target.classList.remove('selected')
    } else {
        document.querySelectorAll('.epubjs-hl.selected').forEach(function(other) {
            other.classList.remove('selected')
        })
        e.target.classList.add('selected')
    }
}

document.onreadystatechange = function () {
    if (document.readyState == "complete") {
        EPUBJS.filePath = "/static/epub.js/js/libs/";
        EPUBJS.cssPath = "/static/epub.js/css/";
        EPUBJS.core.addCss('/static/css/epub.css')
        // fileStorage.filePath = EPUBJS.filePath;
        reader = ePubReader(document.location.pathname.replace(/\/reader\//, '/epub/'), {
            restore: true
        });
        var rendition = reader.rendition,
            book = reader.book;

        rendition.themes.fontSize(fontSize + "%");
        annotations.forEach(function(a) {
            rendition.annotations.highlight(a.cfiRange, {id: a.id}, onHighlightClicked);
        })


        reader.rendition.on('keydown', function(event) {
            if (event.key == 'Delete') {
                document.querySelectorAll('.epubjs-hl.selected').forEach(function(a) {
                    removeAnnotation(a)
                    Ox.$parent.postMessage('removeAnnotation', {id: a.dataset.id})
                })
            }
            if (event.key == 'n') {
                if (currentSelection) {
                    /*
                    var range = currentSelection.contents.window.getSelection().getRangeAt(0)
                    console.log(
                        currentSelection.cfiRange,
                        reader.rendition.book.section().cfiFromRange(range).toString()
                    )
                    //currentSelection.cfiRange = reader.rendition.book.section().cfiFromRange(range).toString()
                    */

                    rendition.annotations.highlight(currentSelection.cfiRange, {id: currentSelection.id}, onHighlightClicked);
                    currentSelection.contents.window.getSelection().removeAllRanges();
                    delete currentSelection.contents
                    addAnnotation(currentSelection)
                    document.querySelectorAll('.epubjs-hl.selected').forEach(function(other) {
                        other.classList.remove('selected')
                    })
                    currentSelection = null
                }
            }
            if (event.keyCode == 61 && event.shiftKey) {
                fontSize += 10
                rendition.themes.fontSize(fontSize + "%");
                localStorage.epubFontSize = fontSize
                event.preventDefault()
            } else if (event.keyCode == 173 && event.shiftKey) {
                fontSize -= 10
                rendition.themes.fontSize(fontSize + "%");
                localStorage.epubFontSize = fontSize
                event.preventDefault()
            } else if (event.keyCode == 48 && event.shiftKey) {
                fontSize = 100
                rendition.themes.fontSize(fontSize + "%");
                localStorage.epubFontSize = fontSize
                event.preventDefault()
            }
            console.log(fontSize)
        })
        rendition.on("mark", function(cfiRange, contents) {
            console.log('!! mark', cfiRange)
        })
        rendition.on("selected", function(cfiRange, contents) {
            getText(book, cfiRange, function(text) {
                currentSelection = {
                    id: Ox.SHA1(cfiRange),
                    created: (new Date).toISOString(),
                    cfiRange: cfiRange,
                    text: text,
                    contents: contents
                }
            })
        });
    }
};