Null renderer with no interactable

Author: colin-grant-work

packages/preferences/src/browser/views/components/preference-null-input.ts

@@ -0,0 +1,52 @@
+// *****************************************************************************
+// Copyright (C) 2025 Eclipse GmbH and others.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License v. 2.0 which is available at
+// http://www.eclipse.org/legal/epl-2.0.
+//
+// This Source Code may also be made available under the following Secondary
+// Licenses when the conditions for such availability set forth in the Eclipse
+// Public License v. 2.0 are satisfied: GNU General Public License, version 2
+// with the GNU Classpath Exception which is available at
+// https://www.gnu.org/software/classpath/license.html.
+//
+// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
+// *****************************************************************************
+
+import { injectable, interfaces } from '@theia/core/shared/inversify';
+import { PreferenceLeafNodeRenderer, PreferenceNodeRenderer } from './preference-node-renderer';
+import { Preference } from '../../util/preference-types';
+import { PreferenceLeafNodeRendererContribution } from './preference-node-renderer-creator';
+
+@injectable()
+/** For rendering preference items for which the only interesting feature is the description */
+export class PreferenceNullInputRenderer extends PreferenceLeafNodeRenderer<null, HTMLElement> {
+    protected override createInteractable(container: HTMLElement): void {
+        const span = document.createElement('span');
+        this.interactable = span;
+        container.appendChild(span);
+    }
+
+    protected override getFallbackValue(): null {
+        // eslint-disable-next-line no-null/no-null
+        return null;
+    }
+
+    protected override doHandleValueChange(): void { }
+}
+
+@injectable()
+export class PreferenceNullRendererContribution extends PreferenceLeafNodeRendererContribution {
+    static ID = 'preference-null-renderer';
+    id = PreferenceNullRendererContribution.ID;
+
+    canHandleLeafNode(node: Preference.LeafNode): number {
+        const isOnlyNull = node.preference.data.type === 'null' || Array.isArray(node.preference.data.type) && node.preference.data.type.every(candidate => candidate === 'null');
+        return isOnlyNull ? 5 : 0;
+    }
+
+    createLeafNodeRenderer(container: interfaces.Container): PreferenceNodeRenderer {
+        return container.get(PreferenceNullInputRenderer);
+    }
+}

packages/preferences/src/browser/views/preference-widget-bindings.ts

@@ -36,6 +36,7 @@ import { PreferencesScopeTabBar } from './preference-scope-tabbar-widget';
 import { PreferencesSearchbarWidget } from './preference-searchbar-widget';
 import { PreferencesTreeWidget } from './preference-tree-widget';
 import { PreferencesWidget } from './preference-widget';
+import { PreferenceNullInputRenderer, PreferenceNullRendererContribution } from './components/preference-null-input';
 
 export function bindPreferencesWidgets(bind: interfaces.Bind): void {
     bind(PreferenceTreeLabelProvider).toSelf().inSingletonScope();
@@ -58,6 +59,8 @@ export function bindPreferencesWidgets(bind: interfaces.Bind): void {
 
     bind(PreferenceStringInputRenderer).toSelf();
     bind(PreferenceNodeRendererContribution).to(PreferenceStringInputRendererContribution).inSingletonScope();
+    bind(PreferenceNullInputRenderer).toSelf();
+    bind(PreferenceNodeRendererContribution).to(PreferenceNullRendererContribution).inSingletonScope();
 
     bind(PreferenceBooleanInputRenderer).toSelf();
     bind(PreferenceNodeRendererContribution).to(PreferenceBooleanInputRendererContribution).inSingletonScope();