import Parchment from 'parchment';
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import Emitter from '../core/emitter';
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import Block, { BlockEmbed } from './block';
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import Break from './break';
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import CodeBlock from '../formats/code';
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import Container from './container';
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function isLine(blot) {
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return (blot instanceof Block || blot instanceof BlockEmbed);
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}
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class Scroll extends Parchment.Scroll {
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constructor(domNode, config) {
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super(domNode);
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this.emitter = config.emitter;
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if (Array.isArray(config.whitelist)) {
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this.whitelist = config.whitelist.reduce(function(whitelist, format) {
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whitelist[format] = true;
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return whitelist;
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}, {});
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}
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// Some reason fixes composition issues with character languages in Windows/Chrome, Safari
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this.domNode.addEventListener('DOMNodeInserted', function() {});
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this.optimize();
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this.enable();
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}
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batchStart() {
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this.batch = true;
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}
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batchEnd() {
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this.batch = false;
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this.optimize();
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}
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deleteAt(index, length) {
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let [first, offset] = this.line(index);
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let [last, ] = this.line(index + length);
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super.deleteAt(index, length);
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if (last != null && first !== last && offset > 0) {
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if (first instanceof BlockEmbed || last instanceof BlockEmbed) {
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this.optimize();
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return;
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}
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if (first instanceof CodeBlock) {
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let newlineIndex = first.newlineIndex(first.length(), true);
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if (newlineIndex > -1) {
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first = first.split(newlineIndex + 1);
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if (first === last) {
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this.optimize();
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return;
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}
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}
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} else if (last instanceof CodeBlock) {
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let newlineIndex = last.newlineIndex(0);
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if (newlineIndex > -1) {
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last.split(newlineIndex + 1);
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}
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}
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let ref = last.children.head instanceof Break ? null : last.children.head;
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first.moveChildren(last, ref);
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first.remove();
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}
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this.optimize();
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}
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enable(enabled = true) {
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this.domNode.setAttribute('contenteditable', enabled);
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}
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formatAt(index, length, format, value) {
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if (this.whitelist != null && !this.whitelist[format]) return;
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super.formatAt(index, length, format, value);
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this.optimize();
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}
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insertAt(index, value, def) {
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if (def != null && this.whitelist != null && !this.whitelist[value]) return;
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if (index >= this.length()) {
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if (def == null || Parchment.query(value, Parchment.Scope.BLOCK) == null) {
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let blot = Parchment.create(this.statics.defaultChild);
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this.appendChild(blot);
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if (def == null && value.endsWith('\n')) {
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value = value.slice(0, -1);
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}
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blot.insertAt(0, value, def);
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} else {
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let embed = Parchment.create(value, def);
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this.appendChild(embed);
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}
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} else {
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super.insertAt(index, value, def);
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}
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this.optimize();
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}
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insertBefore(blot, ref) {
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if (blot.statics.scope === Parchment.Scope.INLINE_BLOT) {
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let wrapper = Parchment.create(this.statics.defaultChild);
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wrapper.appendChild(blot);
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blot = wrapper;
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}
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super.insertBefore(blot, ref);
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}
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leaf(index) {
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return this.path(index).pop() || [null, -1];
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}
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line(index) {
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if (index === this.length()) {
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return this.line(index - 1);
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}
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return this.descendant(isLine, index);
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}
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lines(index = 0, length = Number.MAX_VALUE) {
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let getLines = (blot, index, length) => {
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let lines = [], lengthLeft = length;
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blot.children.forEachAt(index, length, function(child, index, length) {
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if (isLine(child)) {
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lines.push(child);
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} else if (child instanceof Parchment.Container) {
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lines = lines.concat(getLines(child, index, lengthLeft));
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}
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lengthLeft -= length;
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});
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return lines;
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};
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return getLines(this, index, length);
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}
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optimize(mutations = [], context = {}) {
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if (this.batch === true) return;
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super.optimize(mutations, context);
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if (mutations.length > 0) {
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this.emitter.emit(Emitter.events.SCROLL_OPTIMIZE, mutations, context);
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}
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}
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path(index) {
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return super.path(index).slice(1); // Exclude self
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}
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update(mutations) {
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if (this.batch === true) return;
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let source = Emitter.sources.USER;
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if (typeof mutations === 'string') {
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source = mutations;
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}
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if (!Array.isArray(mutations)) {
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mutations = this.observer.takeRecords();
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}
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if (mutations.length > 0) {
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this.emitter.emit(Emitter.events.SCROLL_BEFORE_UPDATE, source, mutations);
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}
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super.update(mutations.concat([])); // pass copy
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if (mutations.length > 0) {
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this.emitter.emit(Emitter.events.SCROLL_UPDATE, source, mutations);
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}
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}
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}
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Scroll.blotName = 'scroll';
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Scroll.className = 'ql-editor';
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Scroll.tagName = 'DIV';
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Scroll.defaultChild = 'block';
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Scroll.allowedChildren = [Block, BlockEmbed, Container];
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export default Scroll;
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