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tenfourfox/accessible/jsat/Presentation.jsm

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/* global Components, XPCOMUtils, Utils, Logger, BraillePresenter, Presentation,
UtteranceGenerator, BrailleGenerator, States, Roles, PivotContext */
/* exported Presentation */
'use strict';
const {utils: Cu, interfaces: Ci} = Components;
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
Cu.import('resource://gre/modules/accessibility/Utils.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'Logger', // jshint ignore:line
'resource://gre/modules/accessibility/Utils.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'PivotContext', // jshint ignore:line
'resource://gre/modules/accessibility/Utils.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'UtteranceGenerator', // jshint ignore:line
'resource://gre/modules/accessibility/OutputGenerator.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'BrailleGenerator', // jshint ignore:line
'resource://gre/modules/accessibility/OutputGenerator.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'Roles', // jshint ignore:line
'resource://gre/modules/accessibility/Constants.jsm');
XPCOMUtils.defineLazyModuleGetter(this, 'States', // jshint ignore:line
'resource://gre/modules/accessibility/Constants.jsm');
this.EXPORTED_SYMBOLS = ['Presentation']; // jshint ignore:line
/**
* The interface for all presenter classes. A presenter could be, for example,
* a speech output module, or a visual cursor indicator.
*/
function Presenter() {}
Presenter.prototype = {
/**
* The type of presenter. Used for matching it with the appropriate output method.
*/
type: 'Base',
/**
* The virtual cursor's position changed.
* @param {PivotContext} aContext the context object for the new pivot
* position.
* @param {int} aReason the reason for the pivot change.
* See nsIAccessiblePivot.
* @param {bool} aIsFromUserInput the pivot change was invoked by the user
*/
pivotChanged: function pivotChanged(aContext, aReason, aIsFromUserInput) {}, // jshint ignore:line
/**
* An object's action has been invoked.
* @param {nsIAccessible} aObject the object that has been invoked.
* @param {string} aActionName the name of the action.
*/
actionInvoked: function actionInvoked(aObject, aActionName) {}, // jshint ignore:line
/**
* Text has changed, either by the user or by the system. TODO.
*/
textChanged: function textChanged(aAccessible, aIsInserted, aStartOffset, // jshint ignore:line
aLength, aText, aModifiedText) {}, // jshint ignore:line
/**
* Text selection has changed. TODO.
*/
textSelectionChanged: function textSelectionChanged(
aText, aStart, aEnd, aOldStart, aOldEnd, aIsFromUserInput) {}, // jshint ignore:line
/**
* Selection has changed. TODO.
* @param {nsIAccessible} aObject the object that has been selected.
*/
selectionChanged: function selectionChanged(aObject) {}, // jshint ignore:line
/**
* Name has changed.
* @param {nsIAccessible} aAccessible the object whose value has changed.
*/
nameChanged: function nameChanged(aAccessible) {}, // jshint ignore: line
/**
* Value has changed.
* @param {nsIAccessible} aAccessible the object whose value has changed.
*/
valueChanged: function valueChanged(aAccessible) {}, // jshint ignore:line
/**
* The tab, or the tab's document state has changed.
* @param {nsIAccessible} aDocObj the tab document accessible that has had its
* state changed, or null if the tab has no associated document yet.
* @param {string} aPageState the state name for the tab, valid states are:
* 'newtab', 'loading', 'newdoc', 'loaded', 'stopped', and 'reload'.
*/
tabStateChanged: function tabStateChanged(aDocObj, aPageState) {}, // jshint ignore:line
/**
* The current tab has changed.
* @param {PivotContext} aDocContext context object for tab's
* document.
* @param {PivotContext} aVCContext context object for tab's current
* virtual cursor position.
*/
tabSelected: function tabSelected(aDocContext, aVCContext) {}, // jshint ignore:line
/**
* The viewport has changed, either a scroll, pan, zoom, or
* landscape/portrait toggle.
* @param {Window} aWindow window of viewport that changed.
* @param {PivotContext} aCurrentContext context of last pivot change.
*/
viewportChanged: function viewportChanged(aWindow, aCurrentContext) {}, // jshint ignore:line
/**
* We have entered or left text editing mode.
*/
editingModeChanged: function editingModeChanged(aIsEditing) {}, // jshint ignore:line
/**
* Announce something. Typically an app state change.
*/
announce: function announce(aAnnouncement) {}, // jshint ignore:line
/**
* User tried to move cursor forward or backward with no success.
* @param {string} aMoveMethod move method that was used (eg. 'moveNext').
*/
noMove: function noMove(aMoveMethod) {},
/**
* Announce a live region.
* @param {PivotContext} aContext context object for an accessible.
* @param {boolean} aIsPolite A politeness level for a live region.
* @param {boolean} aIsHide An indicator of hide/remove event.
* @param {string} aModifiedText Optional modified text.
*/
liveRegion: function liveRegionShown(aContext, aIsPolite, aIsHide, // jshint ignore:line
aModifiedText) {} // jshint ignore:line
};
/**
* Visual presenter. Draws a box around the virtual cursor's position.
*/
function VisualPresenter() {}
VisualPresenter.prototype = Object.create(Presenter.prototype);
VisualPresenter.prototype.type = 'Visual';
/**
* The padding in pixels between the object and the highlight border.
*/
VisualPresenter.prototype.BORDER_PADDING = 2;
VisualPresenter.prototype.viewportChanged =
function VisualPresenter_viewportChanged(aWindow, aCurrentContext) {
if (!aCurrentContext) {
return null;
}
let currentAcc = aCurrentContext.accessibleForBounds;
let start = aCurrentContext.startOffset;
let end = aCurrentContext.endOffset;
if (Utils.isAliveAndVisible(currentAcc)) {
let bounds = (start === -1 && end === -1) ? Utils.getBounds(currentAcc) :
Utils.getTextBounds(currentAcc, start, end);
return {
type: this.type,
details: {
eventType: 'viewport-change',
bounds: bounds,
padding: this.BORDER_PADDING
}
};
}
return null;
};
VisualPresenter.prototype.pivotChanged =
function VisualPresenter_pivotChanged(aContext) {
if (!aContext.accessible) {
// XXX: Don't hide because another vc may be using the highlight.
return null;
}
try {
aContext.accessibleForBounds.scrollTo(
Ci.nsIAccessibleScrollType.SCROLL_TYPE_ANYWHERE);
let bounds = (aContext.startOffset === -1 && aContext.endOffset === -1) ?
aContext.bounds : Utils.getTextBounds(aContext.accessibleForBounds,
aContext.startOffset,
aContext.endOffset);
return {
type: this.type,
details: {
eventType: 'vc-change',
bounds: bounds,
padding: this.BORDER_PADDING
}
};
} catch (e) {
Logger.logException(e, 'Failed to get bounds');
return null;
}
};
VisualPresenter.prototype.tabSelected =
function VisualPresenter_tabSelected(aDocContext, aVCContext) {
return this.pivotChanged(aVCContext, Ci.nsIAccessiblePivot.REASON_NONE);
};
VisualPresenter.prototype.tabStateChanged =
function VisualPresenter_tabStateChanged(aDocObj, aPageState) {
if (aPageState == 'newdoc') {
return {type: this.type, details: {eventType: 'tabstate-change'}};
}
return null;
};
/**
* Android presenter. Fires Android a11y events.
*/
function AndroidPresenter() {}
AndroidPresenter.prototype = Object.create(Presenter.prototype);
AndroidPresenter.prototype.type = 'Android';
// Android AccessibilityEvent type constants.
AndroidPresenter.prototype.ANDROID_VIEW_CLICKED = 0x01;
AndroidPresenter.prototype.ANDROID_VIEW_LONG_CLICKED = 0x02;
AndroidPresenter.prototype.ANDROID_VIEW_SELECTED = 0x04;
AndroidPresenter.prototype.ANDROID_VIEW_FOCUSED = 0x08;
AndroidPresenter.prototype.ANDROID_VIEW_TEXT_CHANGED = 0x10;
AndroidPresenter.prototype.ANDROID_WINDOW_STATE_CHANGED = 0x20;
AndroidPresenter.prototype.ANDROID_VIEW_HOVER_ENTER = 0x80;
AndroidPresenter.prototype.ANDROID_VIEW_HOVER_EXIT = 0x100;
AndroidPresenter.prototype.ANDROID_VIEW_SCROLLED = 0x1000;
AndroidPresenter.prototype.ANDROID_VIEW_TEXT_SELECTION_CHANGED = 0x2000;
AndroidPresenter.prototype.ANDROID_ANNOUNCEMENT = 0x4000;
AndroidPresenter.prototype.ANDROID_VIEW_ACCESSIBILITY_FOCUSED = 0x8000;
AndroidPresenter.prototype.ANDROID_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY =
0x20000;
AndroidPresenter.prototype.pivotChanged =
function AndroidPresenter_pivotChanged(aContext, aReason) {
if (!aContext.accessible) {
return null;
}
let androidEvents = [];
let isExploreByTouch = (aReason == Ci.nsIAccessiblePivot.REASON_POINT &&
Utils.AndroidSdkVersion >= 14);
let focusEventType = (Utils.AndroidSdkVersion >= 16) ?
this.ANDROID_VIEW_ACCESSIBILITY_FOCUSED :
this.ANDROID_VIEW_FOCUSED;
if (isExploreByTouch) {
// This isn't really used by TalkBack so this is a half-hearted attempt
// for now.
androidEvents.push({eventType: this.ANDROID_VIEW_HOVER_EXIT, text: []});
}
let brailleOutput = {};
if (Utils.AndroidSdkVersion >= 16) {
if (!this._braillePresenter) {
this._braillePresenter = new BraillePresenter();
}
brailleOutput = this._braillePresenter.pivotChanged(aContext, aReason).
details;
}
if (aReason === Ci.nsIAccessiblePivot.REASON_TEXT) {
if (Utils.AndroidSdkVersion >= 16) {
let adjustedText = aContext.textAndAdjustedOffsets;
androidEvents.push({
eventType: this.ANDROID_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY,
text: [adjustedText.text],
fromIndex: adjustedText.startOffset,
toIndex: adjustedText.endOffset
});
}
} else {
let state = Utils.getState(aContext.accessible);
androidEvents.push({eventType: (isExploreByTouch) ?
this.ANDROID_VIEW_HOVER_ENTER : focusEventType,
text: Utils.localize(UtteranceGenerator.genForContext(
aContext)),
bounds: aContext.bounds,
clickable: aContext.accessible.actionCount > 0,
checkable: state.contains(States.CHECKABLE),
checked: state.contains(States.CHECKED),
brailleOutput: brailleOutput});
}
return {
type: this.type,
details: androidEvents
};
};
AndroidPresenter.prototype.actionInvoked =
function AndroidPresenter_actionInvoked(aObject, aActionName) {
let state = Utils.getState(aObject);
// Checkable objects use TalkBack's text derived from the event state,
// so we don't populate the text here.
let text = '';
if (!state.contains(States.CHECKABLE)) {
text = Utils.localize(UtteranceGenerator.genForAction(aObject,
aActionName));
}
return {
type: this.type,
details: [{
eventType: this.ANDROID_VIEW_CLICKED,
text: text,
checked: state.contains(States.CHECKED)
}]
};
};
AndroidPresenter.prototype.tabSelected =
function AndroidPresenter_tabSelected(aDocContext, aVCContext) {
// Send a pivot change message with the full context utterance for this doc.
return this.pivotChanged(aVCContext, Ci.nsIAccessiblePivot.REASON_NONE);
};
AndroidPresenter.prototype.tabStateChanged =
function AndroidPresenter_tabStateChanged(aDocObj, aPageState) {
return this.announce(
UtteranceGenerator.genForTabStateChange(aDocObj, aPageState));
};
AndroidPresenter.prototype.textChanged = function AndroidPresenter_textChanged(
aAccessible, aIsInserted, aStart, aLength, aText, aModifiedText) {
let eventDetails = {
eventType: this.ANDROID_VIEW_TEXT_CHANGED,
text: [aText],
fromIndex: aStart,
removedCount: 0,
addedCount: 0
};
if (aIsInserted) {
eventDetails.addedCount = aLength;
eventDetails.beforeText =
aText.substring(0, aStart) + aText.substring(aStart + aLength);
} else {
eventDetails.removedCount = aLength;
eventDetails.beforeText =
aText.substring(0, aStart) + aModifiedText + aText.substring(aStart);
}
return {type: this.type, details: [eventDetails]};
};
AndroidPresenter.prototype.textSelectionChanged =
function AndroidPresenter_textSelectionChanged(aText, aStart, aEnd, aOldStart,
aOldEnd, aIsFromUserInput) {
let androidEvents = [];
if (Utils.AndroidSdkVersion >= 14 && !aIsFromUserInput) {
if (!this._braillePresenter) {
this._braillePresenter = new BraillePresenter();
}
let brailleOutput = this._braillePresenter.textSelectionChanged(
aText, aStart, aEnd, aOldStart, aOldEnd, aIsFromUserInput).details;
androidEvents.push({
eventType: this.ANDROID_VIEW_TEXT_SELECTION_CHANGED,
text: [aText],
fromIndex: aStart,
toIndex: aEnd,
itemCount: aText.length,
brailleOutput: brailleOutput
});
}
if (Utils.AndroidSdkVersion >= 16 && aIsFromUserInput) {
let [from, to] = aOldStart < aStart ?
[aOldStart, aStart] : [aStart, aOldStart];
androidEvents.push({
eventType: this.ANDROID_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY,
text: [aText],
fromIndex: from,
toIndex: to
});
}
return {
type: this.type,
details: androidEvents
};
};
AndroidPresenter.prototype.viewportChanged =
function AndroidPresenter_viewportChanged(aWindow, aCurrentContext) {
if (Utils.AndroidSdkVersion < 14) {
return null;
}
let events = [{
eventType: this.ANDROID_VIEW_SCROLLED,
text: [],
scrollX: aWindow.scrollX,
scrollY: aWindow.scrollY,
maxScrollX: aWindow.scrollMaxX,
maxScrollY: aWindow.scrollMaxY
}];
if (Utils.AndroidSdkVersion >= 16 && aCurrentContext) {
let currentAcc = aCurrentContext.accessibleForBounds;
if (Utils.isAliveAndVisible(currentAcc)) {
events.push({
eventType: this.ANDROID_VIEW_ACCESSIBILITY_FOCUSED,
bounds: Utils.getBounds(currentAcc)
});
}
}
return {
type: this.type,
details: events
};
};
AndroidPresenter.prototype.editingModeChanged =
function AndroidPresenter_editingModeChanged(aIsEditing) {
return this.announce(UtteranceGenerator.genForEditingMode(aIsEditing));
};
AndroidPresenter.prototype.announce =
function AndroidPresenter_announce(aAnnouncement) {
let localizedAnnouncement = Utils.localize(aAnnouncement).join(' ');
return {
type: this.type,
details: [{
eventType: (Utils.AndroidSdkVersion >= 16) ?
this.ANDROID_ANNOUNCEMENT : this.ANDROID_VIEW_TEXT_CHANGED,
text: [localizedAnnouncement],
addedCount: localizedAnnouncement.length,
removedCount: 0,
fromIndex: 0
}]
};
};
AndroidPresenter.prototype.liveRegion =
function AndroidPresenter_liveRegion(aContext, aIsPolite,
aIsHide, aModifiedText) {
return this.announce(
UtteranceGenerator.genForLiveRegion(aContext, aIsHide, aModifiedText));
};
AndroidPresenter.prototype.noMove =
function AndroidPresenter_noMove(aMoveMethod) {
return {
type: this.type,
details: [
{ eventType: this.ANDROID_VIEW_ACCESSIBILITY_FOCUSED,
exitView: aMoveMethod,
text: ['']
}]
};
};
/**
* A B2G presenter for Gaia.
*/
function B2GPresenter() {}
B2GPresenter.prototype = Object.create(Presenter.prototype);
B2GPresenter.prototype.type = 'B2G';
B2GPresenter.prototype.keyboardEchoSetting =
new PrefCache('accessibility.accessfu.keyboard_echo');
B2GPresenter.prototype.NO_ECHO = 0;
B2GPresenter.prototype.CHARACTER_ECHO = 1;
B2GPresenter.prototype.WORD_ECHO = 2;
B2GPresenter.prototype.CHARACTER_AND_WORD_ECHO = 3;
/**
* A pattern used for haptic feedback.
* @type {Array}
*/
B2GPresenter.prototype.PIVOT_CHANGE_HAPTIC_PATTERN = [40];
/**
* Pivot move reasons.
* @type {Array}
*/
B2GPresenter.prototype.pivotChangedReasons = ['none', 'next', 'prev', 'first',
'last', 'text', 'point'];
B2GPresenter.prototype.pivotChanged =
function B2GPresenter_pivotChanged(aContext, aReason, aIsUserInput) {
if (!aContext.accessible) {
return null;
}
return {
type: this.type,
details: {
eventType: 'vc-change',
data: UtteranceGenerator.genForContext(aContext),
options: {
pattern: this.PIVOT_CHANGE_HAPTIC_PATTERN,
isKey: Utils.isActivatableOnFingerUp(aContext.accessible),
reason: this.pivotChangedReasons[aReason],
isUserInput: aIsUserInput,
hints: aContext.interactionHints
}
}
};
};
B2GPresenter.prototype.nameChanged =
function B2GPresenter_nameChanged(aAccessible, aIsPolite = true) {
return {
type: this.type,
details: {
eventType: 'name-change',
data: aAccessible.name,
options: {enqueue: aIsPolite}
}
};
};
B2GPresenter.prototype.valueChanged =
function B2GPresenter_valueChanged(aAccessible, aIsPolite = true) {
// the editable value changes are handled in the text changed presenter
if (Utils.getState(aAccessible).contains(States.EDITABLE)) {
return null;
}
return {
type: this.type,
details: {
eventType: 'value-change',
data: aAccessible.value,
options: {enqueue: aIsPolite}
}
};
};
B2GPresenter.prototype.textChanged = function B2GPresenter_textChanged(
aAccessible, aIsInserted, aStart, aLength, aText, aModifiedText) {
let echoSetting = this.keyboardEchoSetting.value;
let text = '';
if (echoSetting == this.CHARACTER_ECHO ||
echoSetting == this.CHARACTER_AND_WORD_ECHO) {
text = aModifiedText;
}
// add word if word boundary is added
if ((echoSetting == this.WORD_ECHO ||
echoSetting == this.CHARACTER_AND_WORD_ECHO) &&
aIsInserted && aLength === 1) {
let accText = aAccessible.QueryInterface(Ci.nsIAccessibleText);
let startBefore = {}, endBefore = {};
let startAfter = {}, endAfter = {};
accText.getTextBeforeOffset(aStart,
Ci.nsIAccessibleText.BOUNDARY_WORD_END, startBefore, endBefore);
let maybeWord = accText.getTextBeforeOffset(aStart + 1,
Ci.nsIAccessibleText.BOUNDARY_WORD_END, startAfter, endAfter);
if (endBefore.value !== endAfter.value) {
text += maybeWord;
}
}
return {
type: this.type,
details: {
eventType: 'text-change',
data: text
}
};
};
B2GPresenter.prototype.actionInvoked =
function B2GPresenter_actionInvoked(aObject, aActionName) {
return {
type: this.type,
details: {
eventType: 'action',
data: UtteranceGenerator.genForAction(aObject, aActionName)
}
};
};
B2GPresenter.prototype.liveRegion = function B2GPresenter_liveRegion(aContext,
aIsPolite, aIsHide, aModifiedText) {
return {
type: this.type,
details: {
eventType: 'liveregion-change',
data: UtteranceGenerator.genForLiveRegion(aContext, aIsHide,
aModifiedText),
options: {enqueue: aIsPolite}
}
};
};
B2GPresenter.prototype.announce =
function B2GPresenter_announce(aAnnouncement) {
return {
type: this.type,
details: {
eventType: 'announcement',
data: aAnnouncement
}
};
};
B2GPresenter.prototype.noMove =
function B2GPresenter_noMove(aMoveMethod) {
return {
type: this.type,
details: {
eventType: 'no-move',
data: aMoveMethod
}
};
};
/**
* A braille presenter
*/
function BraillePresenter() {}
BraillePresenter.prototype = Object.create(Presenter.prototype);
BraillePresenter.prototype.type = 'Braille';
BraillePresenter.prototype.pivotChanged =
function BraillePresenter_pivotChanged(aContext) {
if (!aContext.accessible) {
return null;
}
return {
type: this.type,
details: {
output: Utils.localize(BrailleGenerator.genForContext(aContext)).join(
' '),
selectionStart: 0,
selectionEnd: 0
}
};
};
BraillePresenter.prototype.textSelectionChanged =
function BraillePresenter_textSelectionChanged(aText, aStart, aEnd) {
return {
type: this.type,
details: {
selectionStart: aStart,
selectionEnd: aEnd
}
};
};
this.Presentation = { // jshint ignore:line
get presenters() {
delete this.presenters;
let presenterMap = {
'mobile/android': [VisualPresenter, AndroidPresenter],
'b2g': [VisualPresenter, B2GPresenter],
'browser': [VisualPresenter, B2GPresenter, AndroidPresenter]
};
this.presenters = presenterMap[Utils.MozBuildApp].map(P => new P());
return this.presenters;
},
get displayedAccessibles() {
delete this.displayedAccessibles;
this.displayedAccessibles = new WeakMap();
return this.displayedAccessibles;
},
pivotChanged: function Presentation_pivotChanged(
aPosition, aOldPosition, aReason, aStartOffset, aEndOffset, aIsUserInput) {
let context = new PivotContext(
aPosition, aOldPosition, aStartOffset, aEndOffset);
if (context.accessible) {
this.displayedAccessibles.set(context.accessible.document.window, context);
}
return this.presenters.map(p => p.pivotChanged(context, aReason, aIsUserInput));
},
actionInvoked: function Presentation_actionInvoked(aObject, aActionName) {
return this.presenters.map(p => p.actionInvoked(aObject, aActionName));
},
textChanged: function Presentation_textChanged(aAccessible, aIsInserted,
aStartOffset, aLength, aText,
aModifiedText) {
return this.presenters.map(p => p.textChanged(aAccessible, aIsInserted,
aStartOffset, aLength,
aText, aModifiedText));
},
textSelectionChanged: function textSelectionChanged(aText, aStart, aEnd,
aOldStart, aOldEnd,
aIsFromUserInput) {
return this.presenters.map(p => p.textSelectionChanged(aText, aStart, aEnd,
aOldStart, aOldEnd,
aIsFromUserInput));
},
nameChanged: function nameChanged(aAccessible) {
return this.presenters.map(p => p.nameChanged(aAccessible));
},
valueChanged: function valueChanged(aAccessible) {
return this.presenters.map(p => p.valueChanged(aAccessible));
},
tabStateChanged: function Presentation_tabStateChanged(aDocObj, aPageState) {
return this.presenters.map(p => p.tabStateChanged(aDocObj, aPageState));
},
viewportChanged: function Presentation_viewportChanged(aWindow) {
let context = this.displayedAccessibles.get(aWindow);
return this.presenters.map(p => p.viewportChanged(aWindow, context));
},
editingModeChanged: function Presentation_editingModeChanged(aIsEditing) {
return this.presenters.map(p => p.editingModeChanged(aIsEditing));
},
announce: function Presentation_announce(aAnnouncement) {
// XXX: Typically each presenter uses the UtteranceGenerator,
// but there really isn't a point here.
return this.presenters.map(p => p.announce(UtteranceGenerator.genForAnnouncement(aAnnouncement)));
},
noMove: function Presentation_noMove(aMoveMethod) {
return this.presenters.map(p => p.noMove(aMoveMethod));
},
liveRegion: function Presentation_liveRegion(aAccessible, aIsPolite, aIsHide,
aModifiedText) {
let context;
if (!aModifiedText) {
context = new PivotContext(aAccessible, null, -1, -1, true,
aIsHide ? true : false);
}
return this.presenters.map(p => p.liveRegion(context, aIsPolite, aIsHide,
aModifiedText));
}
};
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