new controller for pdf printing
This commit is contained in:
Hakim El Hattab
195
js/controllers/print.js
Normal file
195
js/controllers/print.js
Normal file
@ -0,0 +1,195 @@
|
||||
import { SLIDES_SELECTOR } from '../utils/constants.js'
|
||||
import { toArray, createStyleSheet } from '../utils/util.js'
|
||||
|
||||
/**
|
||||
* Setups up our presentation for printing/exporting to PDF.
|
||||
*/
|
||||
export default class Print {
|
||||
|
||||
constructor( Reveal ) {
|
||||
|
||||
this.Reveal = Reveal;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Configures the presentation for printing to a static
|
||||
* PDF.
|
||||
*/
|
||||
setupPDF() {
|
||||
|
||||
let config = this.Reveal.getConfig();
|
||||
|
||||
let slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );
|
||||
|
||||
// Dimensions of the PDF pages
|
||||
let pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),
|
||||
pageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );
|
||||
|
||||
// Dimensions of slides within the pages
|
||||
let slideWidth = slideSize.width,
|
||||
slideHeight = slideSize.height;
|
||||
|
||||
// Let the browser know what page size we want to print
|
||||
createStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );
|
||||
|
||||
// Limit the size of certain elements to the dimensions of the slide
|
||||
createStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );
|
||||
|
||||
document.documentElement.classList.add( 'print-pdf' );
|
||||
document.body.style.width = pageWidth + 'px';
|
||||
document.body.style.height = pageHeight + 'px';
|
||||
|
||||
// Make sure stretch elements fit on slide
|
||||
this.Reveal.layoutSlideContents( slideWidth, slideHeight );
|
||||
|
||||
// Compute slide numbers now, before we start duplicating slides
|
||||
let doingSlideNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );
|
||||
toArray( this.Reveal.getRevealElement().querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
||||
slide.setAttribute( 'data-slide-number', this.Reveal.slideNumber.getSlideNumber( slide ) );
|
||||
}, this );
|
||||
|
||||
// Slide and slide background layout
|
||||
toArray( this.Reveal.getRevealElement().querySelectorAll( SLIDES_SELECTOR ) ).forEach( function( slide ) {
|
||||
|
||||
// Vertical stacks are not centred since their section
|
||||
// children will be
|
||||
if( slide.classList.contains( 'stack' ) === false ) {
|
||||
// Center the slide inside of the page, giving the slide some margin
|
||||
let left = ( pageWidth - slideWidth ) / 2,
|
||||
top = ( pageHeight - slideHeight ) / 2;
|
||||
|
||||
let contentHeight = slide.scrollHeight;
|
||||
let numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );
|
||||
|
||||
// Adhere to configured pages per slide limit
|
||||
numberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );
|
||||
|
||||
// Center slides vertically
|
||||
if( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {
|
||||
top = Math.max( ( pageHeight - contentHeight ) / 2, 0 );
|
||||
}
|
||||
|
||||
// Wrap the slide in a page element and hide its overflow
|
||||
// so that no page ever flows onto another
|
||||
let page = document.createElement( 'div' );
|
||||
page.className = 'pdf-page';
|
||||
page.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';
|
||||
slide.parentNode.insertBefore( page, slide );
|
||||
page.appendChild( slide );
|
||||
|
||||
// Position the slide inside of the page
|
||||
slide.style.left = left + 'px';
|
||||
slide.style.top = top + 'px';
|
||||
slide.style.width = slideWidth + 'px';
|
||||
|
||||
if( slide.slideBackgroundElement ) {
|
||||
page.insertBefore( slide.slideBackgroundElement, slide );
|
||||
}
|
||||
|
||||
// Inject notes if `showNotes` is enabled
|
||||
if( config.showNotes ) {
|
||||
|
||||
// Are there notes for this slide?
|
||||
let notes = getSlideNotes( slide );
|
||||
if( notes ) {
|
||||
|
||||
let notesSpacing = 8;
|
||||
let notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';
|
||||
let notesElement = document.createElement( 'div' );
|
||||
notesElement.classList.add( 'speaker-notes' );
|
||||
notesElement.classList.add( 'speaker-notes-pdf' );
|
||||
notesElement.setAttribute( 'data-layout', notesLayout );
|
||||
notesElement.innerHTML = notes;
|
||||
|
||||
if( notesLayout === 'separate-page' ) {
|
||||
page.parentNode.insertBefore( notesElement, page.nextSibling );
|
||||
}
|
||||
else {
|
||||
notesElement.style.left = notesSpacing + 'px';
|
||||
notesElement.style.bottom = notesSpacing + 'px';
|
||||
notesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';
|
||||
page.appendChild( notesElement );
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// Inject slide numbers if `slideNumbers` are enabled
|
||||
if( doingSlideNumbers ) {
|
||||
let numberElement = document.createElement( 'div' );
|
||||
numberElement.classList.add( 'slide-number' );
|
||||
numberElement.classList.add( 'slide-number-pdf' );
|
||||
numberElement.innerHTML = slide.getAttribute( 'data-slide-number' );
|
||||
page.appendChild( numberElement );
|
||||
}
|
||||
|
||||
// Copy page and show fragments one after another
|
||||
if( config.pdfSeparateFragments ) {
|
||||
|
||||
// Each fragment 'group' is an array containing one or more
|
||||
// fragments. Multiple fragments that appear at the same time
|
||||
// are part of the same group.
|
||||
let fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );
|
||||
|
||||
let previousFragmentStep;
|
||||
let previousPage;
|
||||
|
||||
fragmentGroups.forEach( function( fragments ) {
|
||||
|
||||
// Remove 'current-fragment' from the previous group
|
||||
if( previousFragmentStep ) {
|
||||
previousFragmentStep.forEach( function( fragment ) {
|
||||
fragment.classList.remove( 'current-fragment' );
|
||||
} );
|
||||
}
|
||||
|
||||
// Show the fragments for the current index
|
||||
fragments.forEach( function( fragment ) {
|
||||
fragment.classList.add( 'visible', 'current-fragment' );
|
||||
}, this );
|
||||
|
||||
// Create a separate page for the current fragment state
|
||||
let clonedPage = page.cloneNode( true );
|
||||
page.parentNode.insertBefore( clonedPage, ( previousPage || page ).nextSibling );
|
||||
|
||||
previousFragmentStep = fragments;
|
||||
previousPage = clonedPage;
|
||||
|
||||
}, this );
|
||||
|
||||
// Reset the first/original page so that all fragments are hidden
|
||||
fragmentGroups.forEach( function( fragments ) {
|
||||
fragments.forEach( function( fragment ) {
|
||||
fragment.classList.remove( 'visible', 'current-fragment' );
|
||||
} );
|
||||
} );
|
||||
|
||||
}
|
||||
// Show all fragments
|
||||
else {
|
||||
toArray( page.querySelectorAll( '.fragment:not(.fade-out)' ) ).forEach( function( fragment ) {
|
||||
fragment.classList.add( 'visible' );
|
||||
} );
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}, this );
|
||||
|
||||
// Notify subscribers that the PDF layout is good to go
|
||||
this.Reveal.dispatchEvent({ type: 'pdf-ready' });
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Checks if this instance is being used to print a PDF.
|
||||
*/
|
||||
isPrintingPDF() {
|
||||
|
||||
return ( /print-pdf/gi ).test( window.location.search );
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user