226 lines
11 KiB
JavaScript
226 lines
11 KiB
JavaScript
"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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};
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var Strings = require("./Strings");
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var Platform_1 = require("./common/Platform");
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var RenderDebouncer_1 = require("./ui/RenderDebouncer");
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var Lifecycle_1 = require("./ui/Lifecycle");
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var Lifecycle_2 = require("./common/Lifecycle");
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var ScreenDprMonitor_1 = require("./ui/ScreenDprMonitor");
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var MAX_ROWS_TO_READ = 20;
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var AccessibilityManager = (function (_super) {
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__extends(AccessibilityManager, _super);
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function AccessibilityManager(_terminal, _dimensions) {
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var _this = _super.call(this) || this;
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_this._terminal = _terminal;
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_this._dimensions = _dimensions;
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_this._liveRegionLineCount = 0;
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_this._charsToConsume = [];
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_this._charsToAnnounce = '';
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_this._accessibilityTreeRoot = document.createElement('div');
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_this._accessibilityTreeRoot.classList.add('xterm-accessibility');
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_this._rowContainer = document.createElement('div');
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_this._rowContainer.classList.add('xterm-accessibility-tree');
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_this._rowElements = [];
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for (var i = 0; i < _this._terminal.rows; i++) {
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_this._rowElements[i] = _this._createAccessibilityTreeNode();
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_this._rowContainer.appendChild(_this._rowElements[i]);
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}
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_this._topBoundaryFocusListener = function (e) { return _this._onBoundaryFocus(e, 0); };
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_this._bottomBoundaryFocusListener = function (e) { return _this._onBoundaryFocus(e, 1); };
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_this._rowElements[0].addEventListener('focus', _this._topBoundaryFocusListener);
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_this._rowElements[_this._rowElements.length - 1].addEventListener('focus', _this._bottomBoundaryFocusListener);
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_this._refreshRowsDimensions();
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_this._accessibilityTreeRoot.appendChild(_this._rowContainer);
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_this._renderRowsDebouncer = new RenderDebouncer_1.RenderDebouncer(_this._renderRows.bind(_this));
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_this._refreshRows();
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_this._liveRegion = document.createElement('div');
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_this._liveRegion.classList.add('live-region');
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_this._liveRegion.setAttribute('aria-live', 'assertive');
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_this._accessibilityTreeRoot.appendChild(_this._liveRegion);
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_this._terminal.element.insertAdjacentElement('afterbegin', _this._accessibilityTreeRoot);
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_this.register(_this._renderRowsDebouncer);
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_this.register(_this._terminal.onResize(function (e) { return _this._onResize(e.rows); }));
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_this.register(_this._terminal.onRender(function (e) { return _this._refreshRows(e.start, e.end); }));
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_this.register(_this._terminal.onScroll(function () { return _this._refreshRows(); }));
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_this.register(_this._terminal.addDisposableListener('a11y.char', function (char) { return _this._onChar(char); }));
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_this.register(_this._terminal.onLineFeed(function () { return _this._onChar('\n'); }));
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_this.register(_this._terminal.addDisposableListener('a11y.tab', function (spaceCount) { return _this._onTab(spaceCount); }));
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_this.register(_this._terminal.onKey(function (e) { return _this._onKey(e.key); }));
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_this.register(_this._terminal.addDisposableListener('blur', function () { return _this._clearLiveRegion(); }));
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_this._screenDprMonitor = new ScreenDprMonitor_1.ScreenDprMonitor();
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_this.register(_this._screenDprMonitor);
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_this._screenDprMonitor.setListener(function () { return _this._refreshRowsDimensions(); });
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_this.register(Lifecycle_1.addDisposableDomListener(window, 'resize', function () { return _this._refreshRowsDimensions(); }));
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return _this;
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}
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AccessibilityManager.prototype.dispose = function () {
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_super.prototype.dispose.call(this);
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this._terminal.element.removeChild(this._accessibilityTreeRoot);
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this._rowElements.length = 0;
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};
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AccessibilityManager.prototype._onBoundaryFocus = function (e, position) {
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var boundaryElement = e.target;
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var beforeBoundaryElement = this._rowElements[position === 0 ? 1 : this._rowElements.length - 2];
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var posInSet = boundaryElement.getAttribute('aria-posinset');
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var lastRowPos = position === 0 ? '1' : "" + this._terminal.buffer.lines.length;
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if (posInSet === lastRowPos) {
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return;
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}
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if (e.relatedTarget !== beforeBoundaryElement) {
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return;
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}
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var topBoundaryElement;
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var bottomBoundaryElement;
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if (position === 0) {
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topBoundaryElement = boundaryElement;
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bottomBoundaryElement = this._rowElements.pop();
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this._rowContainer.removeChild(bottomBoundaryElement);
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}
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else {
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topBoundaryElement = this._rowElements.shift();
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bottomBoundaryElement = boundaryElement;
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this._rowContainer.removeChild(topBoundaryElement);
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}
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topBoundaryElement.removeEventListener('focus', this._topBoundaryFocusListener);
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bottomBoundaryElement.removeEventListener('focus', this._bottomBoundaryFocusListener);
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if (position === 0) {
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var newElement = this._createAccessibilityTreeNode();
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this._rowElements.unshift(newElement);
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this._rowContainer.insertAdjacentElement('afterbegin', newElement);
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}
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else {
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var newElement = this._createAccessibilityTreeNode();
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this._rowElements.push(newElement);
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this._rowContainer.appendChild(newElement);
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}
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this._rowElements[0].addEventListener('focus', this._topBoundaryFocusListener);
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this._rowElements[this._rowElements.length - 1].addEventListener('focus', this._bottomBoundaryFocusListener);
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this._terminal.scrollLines(position === 0 ? -1 : 1);
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this._rowElements[position === 0 ? 1 : this._rowElements.length - 2].focus();
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e.preventDefault();
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e.stopImmediatePropagation();
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};
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AccessibilityManager.prototype._onResize = function (rows) {
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this._rowElements[this._rowElements.length - 1].removeEventListener('focus', this._bottomBoundaryFocusListener);
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for (var i = this._rowContainer.children.length; i < this._terminal.rows; i++) {
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this._rowElements[i] = this._createAccessibilityTreeNode();
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this._rowContainer.appendChild(this._rowElements[i]);
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}
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while (this._rowElements.length > rows) {
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this._rowContainer.removeChild(this._rowElements.pop());
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}
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this._rowElements[this._rowElements.length - 1].addEventListener('focus', this._bottomBoundaryFocusListener);
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this._refreshRowsDimensions();
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};
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AccessibilityManager.prototype._createAccessibilityTreeNode = function () {
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var element = document.createElement('div');
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element.setAttribute('role', 'listitem');
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element.tabIndex = -1;
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this._refreshRowDimensions(element);
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return element;
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};
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AccessibilityManager.prototype._onTab = function (spaceCount) {
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for (var i = 0; i < spaceCount; i++) {
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this._onChar(' ');
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}
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};
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AccessibilityManager.prototype._onChar = function (char) {
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var _this = this;
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if (this._liveRegionLineCount < MAX_ROWS_TO_READ + 1) {
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if (this._charsToConsume.length > 0) {
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var shiftedChar = this._charsToConsume.shift();
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if (shiftedChar !== char) {
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this._charsToAnnounce += char;
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}
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}
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else {
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this._charsToAnnounce += char;
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}
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if (char === '\n') {
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this._liveRegionLineCount++;
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if (this._liveRegionLineCount === MAX_ROWS_TO_READ + 1) {
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this._liveRegion.textContent += Strings.tooMuchOutput;
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}
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}
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if (Platform_1.isMac) {
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if (this._liveRegion.textContent && this._liveRegion.textContent.length > 0 && !this._liveRegion.parentNode) {
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setTimeout(function () {
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_this._accessibilityTreeRoot.appendChild(_this._liveRegion);
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}, 0);
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}
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}
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}
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};
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AccessibilityManager.prototype._clearLiveRegion = function () {
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this._liveRegion.textContent = '';
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this._liveRegionLineCount = 0;
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if (Platform_1.isMac) {
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if (this._liveRegion.parentNode) {
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this._accessibilityTreeRoot.removeChild(this._liveRegion);
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}
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}
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};
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AccessibilityManager.prototype._onKey = function (keyChar) {
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this._clearLiveRegion();
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this._charsToConsume.push(keyChar);
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};
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AccessibilityManager.prototype._refreshRows = function (start, end) {
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this._renderRowsDebouncer.refresh(start, end, this._terminal.rows);
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};
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AccessibilityManager.prototype._renderRows = function (start, end) {
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var buffer = this._terminal.buffer;
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var setSize = buffer.lines.length.toString();
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for (var i = start; i <= end; i++) {
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var lineData = buffer.translateBufferLineToString(buffer.ydisp + i, true);
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var posInSet = (buffer.ydisp + i + 1).toString();
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var element = this._rowElements[i];
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if (element) {
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element.textContent = lineData.length === 0 ? Strings.blankLine : lineData;
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element.setAttribute('aria-posinset', posInSet);
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element.setAttribute('aria-setsize', setSize);
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}
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}
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this._announceCharacters();
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};
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AccessibilityManager.prototype._refreshRowsDimensions = function () {
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if (!this._dimensions.actualCellHeight) {
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return;
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}
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if (this._rowElements.length !== this._terminal.rows) {
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this._onResize(this._terminal.rows);
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}
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for (var i = 0; i < this._terminal.rows; i++) {
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this._refreshRowDimensions(this._rowElements[i]);
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}
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};
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AccessibilityManager.prototype.setDimensions = function (dimensions) {
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this._dimensions = dimensions;
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this._refreshRowsDimensions();
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};
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AccessibilityManager.prototype._refreshRowDimensions = function (element) {
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element.style.height = this._dimensions.actualCellHeight + "px";
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};
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AccessibilityManager.prototype._announceCharacters = function () {
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if (this._charsToAnnounce.length === 0) {
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return;
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}
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this._liveRegion.textContent += this._charsToAnnounce;
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this._charsToAnnounce = '';
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};
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return AccessibilityManager;
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}(Lifecycle_2.Disposable));
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exports.AccessibilityManager = AccessibilityManager;
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//# sourceMappingURL=AccessibilityManager.js.map
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