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old/assets/js/blots/scroll.js

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JavaScript
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2018-10-16 16:28:42 +00:00
import Parchment from 'parchment';
import Emitter from '../core/emitter';
import Block, { BlockEmbed } from './block';
import Break from './break';
import CodeBlock from '../formats/code';
import Container from './container';
function isLine(blot) {
return (blot instanceof Block || blot instanceof BlockEmbed);
}
class Scroll extends Parchment.Scroll {
constructor(domNode, config) {
super(domNode);
this.emitter = config.emitter;
if (Array.isArray(config.whitelist)) {
this.whitelist = config.whitelist.reduce(function(whitelist, format) {
whitelist[format] = true;
return whitelist;
}, {});
}
// Some reason fixes composition issues with character languages in Windows/Chrome, Safari
this.domNode.addEventListener('DOMNodeInserted', function() {});
this.optimize();
this.enable();
}
batchStart() {
this.batch = true;
}
batchEnd() {
this.batch = false;
this.optimize();
}
deleteAt(index, length) {
let [first, offset] = this.line(index);
let [last, ] = this.line(index + length);
super.deleteAt(index, length);
if (last != null && first !== last && offset > 0) {
if (first instanceof BlockEmbed || last instanceof BlockEmbed) {
this.optimize();
return;
}
if (first instanceof CodeBlock) {
let newlineIndex = first.newlineIndex(first.length(), true);
if (newlineIndex > -1) {
first = first.split(newlineIndex + 1);
if (first === last) {
this.optimize();
return;
}
}
} else if (last instanceof CodeBlock) {
let newlineIndex = last.newlineIndex(0);
if (newlineIndex > -1) {
last.split(newlineIndex + 1);
}
}
let ref = last.children.head instanceof Break ? null : last.children.head;
first.moveChildren(last, ref);
first.remove();
}
this.optimize();
}
enable(enabled = true) {
this.domNode.setAttribute('contenteditable', enabled);
}
formatAt(index, length, format, value) {
if (this.whitelist != null && !this.whitelist[format]) return;
super.formatAt(index, length, format, value);
this.optimize();
}
insertAt(index, value, def) {
if (def != null && this.whitelist != null && !this.whitelist[value]) return;
if (index >= this.length()) {
if (def == null || Parchment.query(value, Parchment.Scope.BLOCK) == null) {
let blot = Parchment.create(this.statics.defaultChild);
this.appendChild(blot);
if (def == null && value.endsWith('\n')) {
value = value.slice(0, -1);
}
blot.insertAt(0, value, def);
} else {
let embed = Parchment.create(value, def);
this.appendChild(embed);
}
} else {
super.insertAt(index, value, def);
}
this.optimize();
}
insertBefore(blot, ref) {
if (blot.statics.scope === Parchment.Scope.INLINE_BLOT) {
let wrapper = Parchment.create(this.statics.defaultChild);
wrapper.appendChild(blot);
blot = wrapper;
}
super.insertBefore(blot, ref);
}
leaf(index) {
return this.path(index).pop() || [null, -1];
}
line(index) {
if (index === this.length()) {
return this.line(index - 1);
}
return this.descendant(isLine, index);
}
lines(index = 0, length = Number.MAX_VALUE) {
let getLines = (blot, index, length) => {
let lines = [], lengthLeft = length;
blot.children.forEachAt(index, length, function(child, index, length) {
if (isLine(child)) {
lines.push(child);
} else if (child instanceof Parchment.Container) {
lines = lines.concat(getLines(child, index, lengthLeft));
}
lengthLeft -= length;
});
return lines;
};
return getLines(this, index, length);
}
optimize(mutations = [], context = {}) {
if (this.batch === true) return;
super.optimize(mutations, context);
if (mutations.length > 0) {
this.emitter.emit(Emitter.events.SCROLL_OPTIMIZE, mutations, context);
}
}
path(index) {
return super.path(index).slice(1); // Exclude self
}
update(mutations) {
if (this.batch === true) return;
let source = Emitter.sources.USER;
if (typeof mutations === 'string') {
source = mutations;
}
if (!Array.isArray(mutations)) {
mutations = this.observer.takeRecords();
}
if (mutations.length > 0) {
this.emitter.emit(Emitter.events.SCROLL_BEFORE_UPDATE, source, mutations);
}
super.update(mutations.concat([])); // pass copy
if (mutations.length > 0) {
this.emitter.emit(Emitter.events.SCROLL_UPDATE, source, mutations);
}
}
}
Scroll.blotName = 'scroll';
Scroll.className = 'ql-editor';
Scroll.tagName = 'DIV';
Scroll.defaultChild = 'block';
Scroll.allowedChildren = [Block, BlockEmbed, Container];
export default Scroll;