Enable/disable webview find buttons based on if results have been found

Fixes #80656

src/vs/workbench/contrib/codeEditor/browser/find/simpleFindWidget.ts

@@ -59,7 +59,7 @@ export abstract class SimpleFindWidget extends Widget {
 					return null;
 				} catch (e) {
 					this.foundMatch = false;
-					this._updateButtons();
+					this.updateButtons(this.foundMatch);
 					return { content: e.message };
 				}
 			}
@@ -70,7 +70,7 @@ export abstract class SimpleFindWidget extends Widget {
 
 		this.oninput(this._findInput.domNode, (e) => {
 			this.foundMatch = this.onInputChanged();
-			this._updateButtons();
+			this.updateButtons(this.foundMatch);
 			this._delayedUpdateHistory();
 		});
 
@@ -209,7 +209,7 @@ export abstract class SimpleFindWidget extends Widget {
 		}
 
 		this._isVisible = true;
-		this._updateButtons();
+		this.updateButtons(this.foundMatch);
 
 		setTimeout(() => {
 			dom.addClass(this._innerDomNode, 'visible');
@@ -240,7 +240,7 @@ export abstract class SimpleFindWidget extends Widget {
 			// Need to delay toggling visibility until after Transition, then visibility hidden - removes from tabIndex list
 			setTimeout(() => {
 				this._isVisible = false;
-				this._updateButtons();
+				this.updateButtons(this.foundMatch);
 				dom.removeClass(this._innerDomNode, 'visible');
 			}, 200);
 		}
@@ -266,10 +266,10 @@ export abstract class SimpleFindWidget extends Widget {
 		return this._findInput.getCaseSensitive();
 	}
 
-	private _updateButtons() {
-		let hasInput = this.inputValue.length > 0;
-		this.prevBtn.setEnabled(this._isVisible && hasInput && this.foundMatch);
-		this.nextBtn.setEnabled(this._isVisible && hasInput && this.foundMatch);
+	protected updateButtons(foundMatch: boolean) {
+		const hasInput = this.inputValue.length > 0;
+		this.prevBtn.setEnabled(this._isVisible && hasInput && foundMatch);
+		this.nextBtn.setEnabled(this._isVisible && hasInput && foundMatch);
 	}
 }
 

src/vs/workbench/contrib/webview/browser/webviewFindWidget.ts

@@ -7,8 +7,10 @@ import { SimpleFindWidget } from 'vs/workbench/contrib/codeEditor/browser/find/s
 import { IContextKeyService, IContextKey } from 'vs/platform/contextkey/common/contextkey';
 import { IContextViewService } from 'vs/platform/contextview/browser/contextView';
 import { KEYBINDING_CONTEXT_WEBVIEW_FIND_WIDGET_FOCUSED } from 'vs/workbench/contrib/webview/browser/webview';
+import { Event } from 'vs/base/common/event';
 
 export interface WebviewFindDelegate {
+	readonly hasFindResult: Event<boolean>;
 	find(value: string, previous: boolean): void;
 	startFind(value: string): void;
 	stopFind(keepSelection?: boolean): void;
@@ -25,6 +27,10 @@ export class WebviewFindWidget extends SimpleFindWidget {
 	) {
 		super(contextViewService, contextKeyService);
 		this._findWidgetFocused = KEYBINDING_CONTEXT_WEBVIEW_FIND_WIDGET_FOCUSED.bindTo(contextKeyService);
+
+		this._register(_delegate.hasFindResult(hasResult => {
+			this.updateButtons(hasResult);
+		}));
 	}
 
 	public find(previous: boolean) {

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

@@ -377,12 +377,17 @@ export class ElectronWebviewBasedWebview extends Disposable implements Webview,
 					return;
 			}
 		}));
+
 		this._register(addDisposableListener(this._webview, 'devtools-opened', () => {
 			this._send('devtools-opened');
 		}));
 
 		if (_options.enableFindWidget) {
 			this._webviewFindWidget = this._register(instantiationService.createInstance(WebviewFindWidget, this));
+
+			this._register(addDisposableListener(this._webview, 'found-in-page', e => {
+				this._hasFindResult.fire(e.result.matches > 0);
+			}));
 		}
 
 		this.style(themeService.getTheme());
@@ -576,6 +581,9 @@ export class ElectronWebviewBasedWebview extends Disposable implements Webview,
 		});
 	}
 
+	private readonly _hasFindResult = this._register(new Emitter<boolean>());
+	public readonly hasFindResult: Event<boolean> = this._hasFindResult.event;
+
 	public startFind(value: string, options?: Electron.FindInPageOptions) {
 		if (!value || !this._webview) {
 			return;
@@ -623,6 +631,7 @@ export class ElectronWebviewBasedWebview extends Disposable implements Webview,
 	}
 
 	public stopFind(keepSelection?: boolean): void {
+		this._hasFindResult.fire(false);
 		if (!this._webview) {
 			return;
 		}