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|
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as browser from 'vs/base/browser/browser';
import * as dom from 'vs/base/browser/dom';
import { IKeyboardEvent, StandardKeyboardEvent } from 'vs/base/browser/keyboardEvent';
import { RunOnceScheduler } from 'vs/base/common/async';
import { Emitter, Event } from 'vs/base/common/event';
import { KeyCode } from 'vs/base/common/keyCodes';
import { Disposable, IDisposable } from 'vs/base/common/lifecycle';
import { Mimes } from 'vs/base/common/mime';
import { OperatingSystem } from 'vs/base/common/platform';
import * as strings from 'vs/base/common/strings';
import { ITextAreaWrapper, ITypeData, TextAreaState, _debugComposition } from 'vs/editor/browser/controller/textAreaState';
import { Position } from 'vs/editor/common/core/position';
import { Selection } from 'vs/editor/common/core/selection';
export namespace TextAreaSyntethicEvents {
export const Tap = '-monaco-textarea-synthetic-tap';
}
export interface ICompositionData {
data: string;
}
export const CopyOptions = {
forceCopyWithSyntaxHighlighting: false
};
export interface IPasteData {
text: string;
metadata: ClipboardStoredMetadata | null;
}
export interface ClipboardDataToCopy {
isFromEmptySelection: boolean;
multicursorText: string[] | null | undefined;
text: string;
html: string | null | undefined;
mode: string | null;
}
export interface ClipboardStoredMetadata {
version: 1;
isFromEmptySelection: boolean | undefined;
multicursorText: string[] | null | undefined;
mode: string | null;
}
export interface ITextAreaInputHost {
getDataToCopy(): ClipboardDataToCopy;
getScreenReaderContent(currentState: TextAreaState): TextAreaState;
deduceModelPosition(viewAnchorPosition: Position, deltaOffset: number, lineFeedCnt: number): Position;
}
interface InMemoryClipboardMetadata {
lastCopiedValue: string;
data: ClipboardStoredMetadata;
}
/**
* Every time we write to the clipboard, we record a bit of extra metadata here.
* Every time we read from the cipboard, if the text matches our last written text,
* we can fetch the previous metadata.
*/
export class InMemoryClipboardMetadataManager {
public static readonly INSTANCE = new InMemoryClipboardMetadataManager();
private _lastState: InMemoryClipboardMetadata | null;
constructor() {
this._lastState = null;
}
public set(lastCopiedValue: string, data: ClipboardStoredMetadata): void {
this._lastState = { lastCopiedValue, data };
}
public get(pastedText: string): ClipboardStoredMetadata | null {
if (this._lastState && this._lastState.lastCopiedValue === pastedText) {
// match!
return this._lastState.data;
}
this._lastState = null;
return null;
}
}
export interface ICompositionStartEvent {
data: string;
}
export interface ICompleteTextAreaWrapper extends ITextAreaWrapper {
readonly onKeyDown: Event<KeyboardEvent>;
readonly onKeyPress: Event<KeyboardEvent>;
readonly onKeyUp: Event<KeyboardEvent>;
readonly onCompositionStart: Event<CompositionEvent>;
readonly onCompositionUpdate: Event<CompositionEvent>;
readonly onCompositionEnd: Event<CompositionEvent>;
readonly onBeforeInput: Event<InputEvent>;
readonly onInput: Event<InputEvent>;
readonly onCut: Event<ClipboardEvent>;
readonly onCopy: Event<ClipboardEvent>;
readonly onPaste: Event<ClipboardEvent>;
readonly onFocus: Event<FocusEvent>;
readonly onBlur: Event<FocusEvent>;
readonly onSyntheticTap: Event<void>;
setIgnoreSelectionChangeTime(reason: string): void;
getIgnoreSelectionChangeTime(): number;
resetSelectionChangeTime(): void;
hasFocus(): boolean;
}
export interface IBrowser {
isAndroid: boolean;
isFirefox: boolean;
isChrome: boolean;
isSafari: boolean;
}
class CompositionContext {
private _lastTypeTextLength: number;
constructor() {
this._lastTypeTextLength = 0;
}
public handleCompositionUpdate(text: string | null | undefined): ITypeData {
text = text || '';
const typeInput: ITypeData = {
text: text,
replacePrevCharCnt: this._lastTypeTextLength,
replaceNextCharCnt: 0,
positionDelta: 0
};
this._lastTypeTextLength = text.length;
return typeInput;
}
}
/**
* Writes screen reader content to the textarea and is able to analyze its input events to generate:
* - onCut
* - onPaste
* - onType
*
* Composition events are generated for presentation purposes (composition input is reflected in onType).
*/
export class TextAreaInput extends Disposable {
private _onFocus = this._register(new Emitter<void>());
public readonly onFocus: Event<void> = this._onFocus.event;
private _onBlur = this._register(new Emitter<void>());
public readonly onBlur: Event<void> = this._onBlur.event;
private _onKeyDown = this._register(new Emitter<IKeyboardEvent>());
public readonly onKeyDown: Event<IKeyboardEvent> = this._onKeyDown.event;
private _onKeyUp = this._register(new Emitter<IKeyboardEvent>());
public readonly onKeyUp: Event<IKeyboardEvent> = this._onKeyUp.event;
private _onCut = this._register(new Emitter<void>());
public readonly onCut: Event<void> = this._onCut.event;
private _onPaste = this._register(new Emitter<IPasteData>());
public readonly onPaste: Event<IPasteData> = this._onPaste.event;
private _onType = this._register(new Emitter<ITypeData>());
public readonly onType: Event<ITypeData> = this._onType.event;
private _onCompositionStart = this._register(new Emitter<ICompositionStartEvent>());
public readonly onCompositionStart: Event<ICompositionStartEvent> = this._onCompositionStart.event;
private _onCompositionUpdate = this._register(new Emitter<ICompositionData>());
public readonly onCompositionUpdate: Event<ICompositionData> = this._onCompositionUpdate.event;
private _onCompositionEnd = this._register(new Emitter<void>());
public readonly onCompositionEnd: Event<void> = this._onCompositionEnd.event;
private _onSelectionChangeRequest = this._register(new Emitter<Selection>());
public readonly onSelectionChangeRequest: Event<Selection> = this._onSelectionChangeRequest.event;
// ---
private readonly _asyncTriggerCut: RunOnceScheduler;
private readonly _asyncFocusGainWriteScreenReaderContent: RunOnceScheduler;
private _textAreaState: TextAreaState;
private _selectionChangeListener: IDisposable | null;
private _hasFocus: boolean;
private _currentComposition: CompositionContext | null;
constructor(
private readonly _host: ITextAreaInputHost,
private readonly _textArea: ICompleteTextAreaWrapper,
private readonly _OS: OperatingSystem,
private readonly _browser: IBrowser
) {
super();
this._asyncTriggerCut = this._register(new RunOnceScheduler(() => this._onCut.fire(), 0));
this._asyncFocusGainWriteScreenReaderContent = this._register(new RunOnceScheduler(() => this.writeScreenReaderContent('asyncFocusGain'), 0));
this._textAreaState = TextAreaState.EMPTY;
this._selectionChangeListener = null;
this.writeScreenReaderContent('ctor');
this._hasFocus = false;
this._currentComposition = null;
let lastKeyDown: IKeyboardEvent | null = null;
this._register(this._textArea.onKeyDown((_e) => {
const e = new StandardKeyboardEvent(_e);
if (e.keyCode === KeyCode.KEY_IN_COMPOSITION
|| (this._currentComposition && e.keyCode === KeyCode.Backspace)) {
// Stop propagation for keyDown events if the IME is processing key input
e.stopPropagation();
}
if (e.equals(KeyCode.Escape)) {
// Prevent default always for `Esc`, otherwise it will generate a keypress
// See https://msdn.microsoft.com/en-us/library/ie/ms536939(v=vs.85).aspx
e.preventDefault();
}
lastKeyDown = e;
this._onKeyDown.fire(e);
}));
this._register(this._textArea.onKeyUp((_e) => {
const e = new StandardKeyboardEvent(_e);
this._onKeyUp.fire(e);
}));
this._register(this._textArea.onCompositionStart((e) => {
if (_debugComposition) {
console.log(`[compositionstart]`, e);
}
const currentComposition = new CompositionContext();
if (this._currentComposition) {
// simply reset the composition context
this._currentComposition = currentComposition;
return;
}
this._currentComposition = currentComposition;
if (
this._OS === OperatingSystem.Macintosh
&& lastKeyDown
&& lastKeyDown.equals(KeyCode.KEY_IN_COMPOSITION)
&& this._textAreaState.selectionStart === this._textAreaState.selectionEnd
&& this._textAreaState.selectionStart > 0
&& this._textAreaState.value.substr(this._textAreaState.selectionStart - 1, 1) === e.data
&& (lastKeyDown.code === 'ArrowRight' || lastKeyDown.code === 'ArrowLeft')
) {
// Handling long press case on Chromium/Safari macOS + arrow key => pretend the character was selected
if (_debugComposition) {
console.log(`[compositionstart] Handling long press case on macOS + arrow key`, e);
}
// Pretend the previous character was composed (in order to get it removed by subsequent compositionupdate events)
currentComposition.handleCompositionUpdate('x');
this._onCompositionStart.fire({ data: e.data });
return;
}
if (this._browser.isAndroid) {
// when tapping on the editor, Android enters composition mode to edit the current word
// so we cannot clear the textarea on Android and we must pretend the current word was selected
this._onCompositionStart.fire({ data: e.data });
return;
}
this._onCompositionStart.fire({ data: e.data });
}));
this._register(this._textArea.onCompositionUpdate((e) => {
if (_debugComposition) {
console.log(`[compositionupdate]`, e);
}
const currentComposition = this._currentComposition;
if (!currentComposition) {
// should not be possible to receive a 'compositionupdate' without a 'compositionstart'
return;
}
if (this._browser.isAndroid) {
// On Android, the data sent with the composition update event is unusable.
// For example, if the cursor is in the middle of a word like Mic|osoft
// and Microsoft is chosen from the keyboard's suggestions, the e.data will contain "Microsoft".
// This is not really usable because it doesn't tell us where the edit began and where it ended.
const newState = TextAreaState.readFromTextArea(this._textArea);
const typeInput = TextAreaState.deduceAndroidCompositionInput(this._textAreaState, newState);
this._textAreaState = newState;
this._onType.fire(typeInput);
this._onCompositionUpdate.fire(e);
return;
}
const typeInput = currentComposition.handleCompositionUpdate(e.data);
this._textAreaState = TextAreaState.readFromTextArea(this._textArea);
this._onType.fire(typeInput);
this._onCompositionUpdate.fire(e);
}));
this._register(this._textArea.onCompositionEnd((e) => {
if (_debugComposition) {
console.log(`[compositionend]`, e);
}
const currentComposition = this._currentComposition;
if (!currentComposition) {
// https://github.com/microsoft/monaco-editor/issues/1663
// On iOS 13.2, Chinese system IME randomly trigger an additional compositionend event with empty data
return;
}
this._currentComposition = null;
if (this._browser.isAndroid) {
// On Android, the data sent with the composition update event is unusable.
// For example, if the cursor is in the middle of a word like Mic|osoft
// and Microsoft is chosen from the keyboard's suggestions, the e.data will contain "Microsoft".
// This is not really usable because it doesn't tell us where the edit began and where it ended.
const newState = TextAreaState.readFromTextArea(this._textArea);
const typeInput = TextAreaState.deduceAndroidCompositionInput(this._textAreaState, newState);
this._textAreaState = newState;
this._onType.fire(typeInput);
this._onCompositionEnd.fire();
return;
}
const typeInput = currentComposition.handleCompositionUpdate(e.data);
this._textAreaState = TextAreaState.readFromTextArea(this._textArea);
this._onType.fire(typeInput);
this._onCompositionEnd.fire();
}));
this._register(this._textArea.onInput((e) => {
if (_debugComposition) {
console.log(`[input]`, e);
}
// Pretend here we touched the text area, as the `input` event will most likely
// result in a `selectionchange` event which we want to ignore
this._textArea.setIgnoreSelectionChangeTime('received input event');
if (this._currentComposition) {
return;
}
const newState = TextAreaState.readFromTextArea(this._textArea);
const typeInput = TextAreaState.deduceInput(this._textAreaState, newState, /*couldBeEmojiInput*/this._OS === OperatingSystem.Macintosh);
if (typeInput.replacePrevCharCnt === 0 && typeInput.text.length === 1 && strings.isHighSurrogate(typeInput.text.charCodeAt(0))) {
// Ignore invalid input but keep it around for next time
return;
}
this._textAreaState = newState;
if (
typeInput.text !== ''
|| typeInput.replacePrevCharCnt !== 0
|| typeInput.replaceNextCharCnt !== 0
|| typeInput.positionDelta !== 0
) {
this._onType.fire(typeInput);
}
}));
// --- Clipboard operations
this._register(this._textArea.onCut((e) => {
// Pretend here we touched the text area, as the `cut` event will most likely
// result in a `selectionchange` event which we want to ignore
this._textArea.setIgnoreSelectionChangeTime('received cut event');
this._ensureClipboardGetsEditorSelection(e);
this._asyncTriggerCut.schedule();
}));
this._register(this._textArea.onCopy((e) => {
this._ensureClipboardGetsEditorSelection(e);
}));
this._register(this._textArea.onPaste((e) => {
// Pretend here we touched the text area, as the `paste` event will most likely
// result in a `selectionchange` event which we want to ignore
this._textArea.setIgnoreSelectionChangeTime('received paste event');
e.preventDefault();
if (!e.clipboardData) {
return;
}
let [text, metadata] = ClipboardEventUtils.getTextData(e.clipboardData);
if (!text) {
return;
}
// try the in-memory store
metadata = metadata || InMemoryClipboardMetadataManager.INSTANCE.get(text);
this._onPaste.fire({
text: text,
metadata: metadata
});
}));
this._register(this._textArea.onFocus(() => {
const hadFocus = this._hasFocus;
this._setHasFocus(true);
if (this._browser.isSafari && !hadFocus && this._hasFocus) {
// When "tabbing into" the textarea, immediately after dispatching the 'focus' event,
// Safari will always move the selection at offset 0 in the textarea
this._asyncFocusGainWriteScreenReaderContent.schedule();
}
}));
this._register(this._textArea.onBlur(() => {
if (this._currentComposition) {
// See https://github.com/microsoft/vscode/issues/112621
// where compositionend is not triggered when the editor
// is taken off-dom during a composition
// Clear the flag to be able to write to the textarea
this._currentComposition = null;
// Clear the textarea to avoid an unwanted cursor type
this.writeScreenReaderContent('blurWithoutCompositionEnd');
// Fire artificial composition end
this._onCompositionEnd.fire();
}
this._setHasFocus(false);
}));
this._register(this._textArea.onSyntheticTap(() => {
if (this._browser.isAndroid && this._currentComposition) {
// on Android, tapping does not cancel the current composition, so the
// textarea is stuck showing the old composition
// Clear the flag to be able to write to the textarea
this._currentComposition = null;
// Clear the textarea to avoid an unwanted cursor type
this.writeScreenReaderContent('tapWithoutCompositionEnd');
// Fire artificial composition end
this._onCompositionEnd.fire();
}
}));
}
_initializeFromTest(): void {
this._hasFocus = true;
this._textAreaState = TextAreaState.readFromTextArea(this._textArea);
}
private _installSelectionChangeListener(): IDisposable {
// See https://github.com/microsoft/vscode/issues/27216 and https://github.com/microsoft/vscode/issues/98256
// When using a Braille display, it is possible for users to reposition the
// system caret. This is reflected in Chrome as a `selectionchange` event.
//
// The `selectionchange` event appears to be emitted under numerous other circumstances,
// so it is quite a challenge to distinguish a `selectionchange` coming in from a user
// using a Braille display from all the other cases.
//
// The problems with the `selectionchange` event are:
// * the event is emitted when the textarea is focused programmatically -- textarea.focus()
// * the event is emitted when the selection is changed in the textarea programmatically -- textarea.setSelectionRange(...)
// * the event is emitted when the value of the textarea is changed programmatically -- textarea.value = '...'
// * the event is emitted when tabbing into the textarea
// * the event is emitted asynchronously (sometimes with a delay as high as a few tens of ms)
// * the event sometimes comes in bursts for a single logical textarea operation
// `selectionchange` events often come multiple times for a single logical change
// so throttle multiple `selectionchange` events that burst in a short period of time.
let previousSelectionChangeEventTime = 0;
return dom.addDisposableListener(document, 'selectionchange', (e) => {
if (!this._hasFocus) {
return;
}
if (this._currentComposition) {
return;
}
if (!this._browser.isChrome) {
// Support only for Chrome until testing happens on other browsers
return;
}
const now = Date.now();
const delta1 = now - previousSelectionChangeEventTime;
previousSelectionChangeEventTime = now;
if (delta1 < 5) {
// received another `selectionchange` event within 5ms of the previous `selectionchange` event
// => ignore it
return;
}
const delta2 = now - this._textArea.getIgnoreSelectionChangeTime();
this._textArea.resetSelectionChangeTime();
if (delta2 < 100) {
// received a `selectionchange` event within 100ms since we touched the textarea
// => ignore it, since we caused it
return;
}
if (!this._textAreaState.selectionStartPosition || !this._textAreaState.selectionEndPosition) {
// Cannot correlate a position in the textarea with a position in the editor...
return;
}
const newValue = this._textArea.getValue();
if (this._textAreaState.value !== newValue) {
// Cannot correlate a position in the textarea with a position in the editor...
return;
}
const newSelectionStart = this._textArea.getSelectionStart();
const newSelectionEnd = this._textArea.getSelectionEnd();
if (this._textAreaState.selectionStart === newSelectionStart && this._textAreaState.selectionEnd === newSelectionEnd) {
// Nothing to do...
return;
}
const _newSelectionStartPosition = this._textAreaState.deduceEditorPosition(newSelectionStart);
const newSelectionStartPosition = this._host.deduceModelPosition(_newSelectionStartPosition[0]!, _newSelectionStartPosition[1], _newSelectionStartPosition[2]);
const _newSelectionEndPosition = this._textAreaState.deduceEditorPosition(newSelectionEnd);
const newSelectionEndPosition = this._host.deduceModelPosition(_newSelectionEndPosition[0]!, _newSelectionEndPosition[1], _newSelectionEndPosition[2]);
const newSelection = new Selection(
newSelectionStartPosition.lineNumber, newSelectionStartPosition.column,
newSelectionEndPosition.lineNumber, newSelectionEndPosition.column
);
this._onSelectionChangeRequest.fire(newSelection);
});
}
public override dispose(): void {
super.dispose();
if (this._selectionChangeListener) {
this._selectionChangeListener.dispose();
this._selectionChangeListener = null;
}
}
public focusTextArea(): void {
// Setting this._hasFocus and writing the screen reader content
// will result in a focus() and setSelectionRange() in the textarea
this._setHasFocus(true);
// If the editor is off DOM, focus cannot be really set, so let's double check that we have managed to set the focus
this.refreshFocusState();
}
public isFocused(): boolean {
return this._hasFocus;
}
public refreshFocusState(): void {
this._setHasFocus(this._textArea.hasFocus());
}
private _setHasFocus(newHasFocus: boolean): void {
if (this._hasFocus === newHasFocus) {
// no change
return;
}
this._hasFocus = newHasFocus;
if (this._selectionChangeListener) {
this._selectionChangeListener.dispose();
this._selectionChangeListener = null;
}
if (this._hasFocus) {
this._selectionChangeListener = this._installSelectionChangeListener();
}
if (this._hasFocus) {
this.writeScreenReaderContent('focusgain');
}
if (this._hasFocus) {
this._onFocus.fire();
} else {
this._onBlur.fire();
}
}
private _setAndWriteTextAreaState(reason: string, textAreaState: TextAreaState): void {
if (!this._hasFocus) {
textAreaState = textAreaState.collapseSelection();
}
textAreaState.writeToTextArea(reason, this._textArea, this._hasFocus);
this._textAreaState = textAreaState;
}
public writeScreenReaderContent(reason: string): void {
if (this._currentComposition) {
// Do not write to the text area when doing composition
return;
}
this._setAndWriteTextAreaState(reason, this._host.getScreenReaderContent(this._textAreaState));
}
private _ensureClipboardGetsEditorSelection(e: ClipboardEvent): void {
const dataToCopy = this._host.getDataToCopy();
const storedMetadata: ClipboardStoredMetadata = {
version: 1,
isFromEmptySelection: dataToCopy.isFromEmptySelection,
multicursorText: dataToCopy.multicursorText,
mode: dataToCopy.mode
};
InMemoryClipboardMetadataManager.INSTANCE.set(
// When writing "LINE\r\n" to the clipboard and then pasting,
// Firefox pastes "LINE\n", so let's work around this quirk
(this._browser.isFirefox ? dataToCopy.text.replace(/\r\n/g, '\n') : dataToCopy.text),
storedMetadata
);
e.preventDefault();
if (e.clipboardData) {
ClipboardEventUtils.setTextData(e.clipboardData, dataToCopy.text, dataToCopy.html, storedMetadata);
}
}
}
class ClipboardEventUtils {
public static getTextData(clipboardData: DataTransfer): [string, ClipboardStoredMetadata | null] {
const text = clipboardData.getData(Mimes.text);
let metadata: ClipboardStoredMetadata | null = null;
const rawmetadata = clipboardData.getData('vscode-editor-data');
if (typeof rawmetadata === 'string') {
try {
metadata = <ClipboardStoredMetadata>JSON.parse(rawmetadata);
if (metadata.version !== 1) {
metadata = null;
}
} catch (err) {
// no problem!
}
}
return [text, metadata];
}
public static setTextData(clipboardData: DataTransfer, text: string, html: string | null | undefined, metadata: ClipboardStoredMetadata): void {
clipboardData.setData(Mimes.text, text);
if (typeof html === 'string') {
clipboardData.setData('text/html', html);
}
clipboardData.setData('vscode-editor-data', JSON.stringify(metadata));
}
}
export class TextAreaWrapper extends Disposable implements ICompleteTextAreaWrapper {
public readonly onKeyDown = this._register(dom.createEventEmitter(this._actual, 'keydown')).event;
public readonly onKeyPress = this._register(dom.createEventEmitter(this._actual, 'keypress')).event;
public readonly onKeyUp = this._register(dom.createEventEmitter(this._actual, 'keyup')).event;
public readonly onCompositionStart = this._register(dom.createEventEmitter(this._actual, 'compositionstart')).event;
public readonly onCompositionUpdate = this._register(dom.createEventEmitter(this._actual, 'compositionupdate')).event;
public readonly onCompositionEnd = this._register(dom.createEventEmitter(this._actual, 'compositionend')).event;
public readonly onBeforeInput = this._register(dom.createEventEmitter(this._actual, 'beforeinput')).event;
public readonly onInput = <Event<InputEvent>>this._register(dom.createEventEmitter(this._actual, 'input')).event;
public readonly onCut = this._register(dom.createEventEmitter(this._actual, 'cut')).event;
public readonly onCopy = this._register(dom.createEventEmitter(this._actual, 'copy')).event;
public readonly onPaste = this._register(dom.createEventEmitter(this._actual, 'paste')).event;
public readonly onFocus = this._register(dom.createEventEmitter(this._actual, 'focus')).event;
public readonly onBlur = this._register(dom.createEventEmitter(this._actual, 'blur')).event;
private _onSyntheticTap = this._register(new Emitter<void>());
public readonly onSyntheticTap: Event<void> = this._onSyntheticTap.event;
private _ignoreSelectionChangeTime: number;
constructor(
private readonly _actual: HTMLTextAreaElement
) {
super();
this._ignoreSelectionChangeTime = 0;
this._register(dom.addDisposableListener(this._actual, TextAreaSyntethicEvents.Tap, () => this._onSyntheticTap.fire()));
}
public hasFocus(): boolean {
const shadowRoot = dom.getShadowRoot(this._actual);
if (shadowRoot) {
return shadowRoot.activeElement === this._actual;
} else if (dom.isInDOM(this._actual)) {
return document.activeElement === this._actual;
} else {
return false;
}
}
public setIgnoreSelectionChangeTime(reason: string): void {
this._ignoreSelectionChangeTime = Date.now();
}
public getIgnoreSelectionChangeTime(): number {
return this._ignoreSelectionChangeTime;
}
public resetSelectionChangeTime(): void {
this._ignoreSelectionChangeTime = 0;
}
public getValue(): string {
// console.log('current value: ' + this._textArea.value);
return this._actual.value;
}
public setValue(reason: string, value: string): void {
const textArea = this._actual;
if (textArea.value === value) {
// No change
return;
}
// console.log('reason: ' + reason + ', current value: ' + textArea.value + ' => new value: ' + value);
this.setIgnoreSelectionChangeTime('setValue');
textArea.value = value;
}
public getSelectionStart(): number {
return this._actual.selectionDirection === 'backward' ? this._actual.selectionEnd : this._actual.selectionStart;
}
public getSelectionEnd(): number {
return this._actual.selectionDirection === 'backward' ? this._actual.selectionStart : this._actual.selectionEnd;
}
public setSelectionRange(reason: string, selectionStart: number, selectionEnd: number): void {
const textArea = this._actual;
let activeElement: Element | null = null;
const shadowRoot = dom.getShadowRoot(textArea);
if (shadowRoot) {
activeElement = shadowRoot.activeElement;
} else {
activeElement = document.activeElement;
}
const currentIsFocused = (activeElement === textArea);
const currentSelectionStart = textArea.selectionStart;
const currentSelectionEnd = textArea.selectionEnd;
if (currentIsFocused && currentSelectionStart === selectionStart && currentSelectionEnd === selectionEnd) {
// No change
// Firefox iframe bug https://github.com/microsoft/monaco-editor/issues/643#issuecomment-367871377
if (browser.isFirefox && window.parent !== window) {
textArea.focus();
}
return;
}
// console.log('reason: ' + reason + ', setSelectionRange: ' + selectionStart + ' -> ' + selectionEnd);
if (currentIsFocused) {
// No need to focus, only need to change the selection range
this.setIgnoreSelectionChangeTime('setSelectionRange');
textArea.setSelectionRange(selectionStart, selectionEnd);
if (browser.isFirefox && window.parent !== window) {
textArea.focus();
}
return;
}
// If the focus is outside the textarea, browsers will try really hard to reveal the textarea.
// Here, we try to undo the browser's desperate reveal.
try {
const scrollState = dom.saveParentsScrollTop(textArea);
this.setIgnoreSelectionChangeTime('setSelectionRange');
textArea.focus();
textArea.setSelectionRange(selectionStart, selectionEnd);
dom.restoreParentsScrollTop(textArea, scrollState);
} catch (e) {
// Sometimes IE throws when setting selection (e.g. textarea is off-DOM)
}
}
}
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