125 lines
2.6 KiB
TypeScript
125 lines
2.6 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2009-2022 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Tree Explorers allow to switch on effects on the entire
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* expression tree.
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*
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* @author v.sorge@mathjax.org (Volker Sorge)
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*/
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import {A11yDocument, Region} from './Region.js';
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import {Explorer, AbstractExplorer} from './Explorer.js';
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import Sre from '../sre.js';
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export interface TreeExplorer extends Explorer {
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}
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export class AbstractTreeExplorer extends AbstractExplorer<void> {
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/**
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* @override
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*/
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protected constructor(public document: A11yDocument,
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protected region: Region<void>,
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protected node: HTMLElement,
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protected mml: HTMLElement) {
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super(document, null, node);
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}
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/**
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* @override
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*/
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public readonly stoppable = false;
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/**
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* @override
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*/
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public Attach() {
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super.Attach();
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this.Start();
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}
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/**
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* @override
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*/
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public Detach() {
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this.Stop();
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super.Detach();
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}
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}
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export class FlameColorer extends AbstractTreeExplorer {
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/**
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* @override
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*/
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public Start() {
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if (this.active) return;
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this.active = true;
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this.highlighter.highlightAll(this.node);
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}
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/**
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* @override
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*/
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public Stop() {
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if (this.active) {
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this.highlighter.unhighlightAll();
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}
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this.active = false;
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}
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}
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export class TreeColorer extends AbstractTreeExplorer {
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/**
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* @override
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*/
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public Start() {
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if (this.active) return;
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this.active = true;
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let generator = Sre.getSpeechGenerator('Color');
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if (!this.node.hasAttribute('hasforegroundcolor')) {
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generator.generateSpeech(this.node, this.mml);
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this.node.setAttribute('hasforegroundcolor', 'true');
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}
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// TODO: Make this cleaner in Sre.
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(this.highlighter as any).colorizeAll(this.node);
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}
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/**
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* @override
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*/
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public Stop() {
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if (this.active) {
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(this.highlighter as any).uncolorizeAll(this.node);
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}
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this.active = false;
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}
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}
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