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import Worker from '../worker.js'; import { objType, createElement } from '../utils.js'; /* Pagebreak plugin: Adds page-break functionality to the html2pdf library. Page-breaks can be enabled by CSS styles, set on individual elements using selectors, or avoided from breaking inside all elements. Options on the `opt.pagebreak` object: mode: String or array of strings: 'avoid-all', 'css', and/or 'legacy' Default: ['css', 'legacy'] before: String or array of CSS selectors for which to add page-breaks before each element. Can be a specific element with an ID ('#myID'), all elements of a type (e.g. 'img'), all of a class ('.myClass'), or even '' to match every element. after: Like 'before', but adds a page-break immediately after the element. avoid: Like 'before', but avoids page-breaks on these elements. You can enable this feature on every element using the 'avoid-all' mode. / // Refs to original functions. var orig = { toContainer: Worker.prototype.toContainer }; // Add pagebreak default options to the Worker template. Worker.template.opt.pagebreak = { mode: ['css', 'legacy'], before: [], after: [], avoid: [] }; Worker.prototype.toContainer = function toContainer() { return orig.toContainer.call(this).then(function toContainer_pagebreak() { // Setup root element and inner page height. var root = this.prop.container; var pxPageHeight = this.prop.pageSize.inner.px.height; // Check all requested modes. var modeSrc = [].concat(this.opt.pagebreak.mode); var mode = { avoidAll: modeSrc.indexOf('avoid-all') !== -1, css: modeSrc.indexOf('css') !== -1, legacy: modeSrc.indexOf('legacy') !== -1 }; // Get arrays of all explicitly requested elements. var select = {}; var self = this; ['before', 'after', 'avoid'].forEach(function(key) { var all = mode.avoidAll && key === 'avoid'; select[key] = all ? [] : [].concat(self.opt.pagebreak[key] \|\| []); if (select[key].length > 0) { select[key] = Array.prototype.slice.call( root.querySelectorAll(select[key].join(', '))); } }); // Get all legacy page-break elements. var legacyEls = root.querySelectorAll('.html2pdf__page-break'); legacyEls = Array.prototype.slice.call(legacyEls); // Loop through all elements. var els = root.querySelectorAll('*'); Array.prototype.forEach.call(els, function pagebreak_loop(el) { // Setup pagebreak rules based on legacy and avoidAll modes. var rules = { before: false, after: mode.legacy && legacyEls.indexOf(el) !== -1, avoid: mode.avoidAll }; // Add rules for css mode. if (mode.css) { // TODO: Check if this is valid with iFrames. var style = window.getComputedStyle(el); // TODO: Handle 'left' and 'right' correctly. // TODO: Add support for 'avoid' on breakBefore/After. var breakOpt = ['always', 'page', 'left', 'right']; var avoidOpt = ['avoid', 'avoid-page']; rules = { before: rules.before \|\| breakOpt.indexOf(style.breakBefore \|\| style.pageBreakBefore) !== -1, after: rules.after \|\| breakOpt.indexOf(style.breakAfter \|\| style.pageBreakAfter) !== -1, avoid: rules.avoid \|\| avoidOpt.indexOf(style.breakInside \|\| style.pageBreakInside) !== -1 }; } // Add rules for explicit requests. Object.keys(rules).forEach(function(key) { rules[key] = rules[key] \|\| select[key].indexOf(el) !== -1; }); // Get element position on the screen. // TODO: Subtract the top of the container from clientRect.top/bottom? var clientRect = el.getBoundingClientRect(); // Avoid: Check if a break happens mid-element. if (rules.avoid && !rules.before) { var startPage = Math.floor(clientRect.top / pxPageHeight); var endPage = Math.floor(clientRect.bottom / pxPageHeight); var nPages = Math.abs(clientRect.bottom - clientRect.top) / pxPageHeight; // Turn on rules.before if the el is broken and is at most one page long. if (endPage !== startPage && nPages <= 1) { rules.before = true; } } // Before: Create a padding div to push the element to the next page. if (rules.before) { var pad = createElement('div', {style: { display: 'block', height: pxPageHeight - (clientRect.top % pxPageHeight) + 'px' }}); el.parentNode.insertBefore(pad, el); } // After: Create a padding div to fill the remaining page. if (rules.after) { var pad = createElement('div', {style: { display: 'block', height: pxPageHeight - (clientRect.bottom % pxPageHeight) + 'px' }}); el.parentNode.insertBefore(pad, el.nextSibling); } }); }); };

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