Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973 (#6381)

* Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973

* disable strict null check

src/vs/workbench/contrib/webview/electron-browser/webviewCommands.ts

@@ -0,0 +1,98 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Action } from 'vs/base/common/actions';
+import * as nls from 'vs/nls';
+import { Command, ServicesAccessor } from 'vs/editor/browser/editorExtensions';
+import { WebviewEditor } from 'vs/workbench/contrib/webview/browser/webviewEditor';
+import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
+import { WebviewElement } from 'vs/workbench/contrib/webview/electron-browser/webviewElement';
+
+export class OpenWebviewDeveloperToolsAction extends Action {
+	static readonly ID = 'workbench.action.webview.openDeveloperTools';
+	static readonly ALIAS = 'Open Webview Developer Tools';
+	static readonly LABEL = nls.localize('openToolsLabel', "Open Webview Developer Tools");
+
+	public constructor(id: string, label: string) {
+		super(id, label);
+	}
+
+	public run(): Promise<any> {
+		const elements = document.querySelectorAll('webview.ready');
+		for (let i = 0; i < elements.length; i++) {
+			try {
+				(elements.item(i) as Electron.WebviewTag).openDevTools();
+			} catch (e) {
+				console.error(e);
+			}
+		}
+		return Promise.resolve(true);
+	}
+}
+
+export class SelectAllWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.selectAll';
+
+	public runCommand(accessor: ServicesAccessor, args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.selectAll());
+	}
+}
+
+export class CopyWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.copy';
+
+	public runCommand(accessor: ServicesAccessor, _args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.copy());
+	}
+}
+
+export class PasteWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.paste';
+
+	public runCommand(accessor: ServicesAccessor, _args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.paste());
+	}
+}
+
+export class CutWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.cut';
+
+	public runCommand(accessor: ServicesAccessor, _args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.cut());
+	}
+}
+
+export class UndoWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.undo';
+
+	public runCommand(accessor: ServicesAccessor, args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.undo());
+	}
+}
+
+export class RedoWebviewEditorCommand extends Command {
+	public static readonly ID = 'editor.action.webvieweditor.redo';
+
+	public runCommand(accessor: ServicesAccessor, args: any): void {
+		withActiveWebviewBasedWebview(accessor, webview => webview.redo());
+	}
+}
+
+function getActiveWebviewEditor(accessor: ServicesAccessor): WebviewEditor | undefined {
+	const editorService = accessor.get(IEditorService);
+	const activeControl = editorService.activeControl as WebviewEditor;
+	return activeControl.isWebviewEditor ? activeControl : undefined;
+}
+
+function withActiveWebviewBasedWebview(accessor: ServicesAccessor, f: (webview: WebviewElement) => void): void {
+	const webViewEditor = getActiveWebviewEditor(accessor);
+	if (webViewEditor) {
+		webViewEditor.withWebview(webview => {
+			if (webview instanceof WebviewElement) {
+				f(webview);
+			}
+		});
+	}
+}