Bugfix: Prevent delete a template when has children (#2479)

* Adds "Template Has No Children Condition"

to prevent the "delete" action being displayed
for templates that have child templates.

* Removed condition config type

it didn't have any configurable properties.

Lazy-loaded the manifest api.

* Renamed "Template Has No Children" condition

to "Template Allow Delete Action" condition.

src/packages/templating/templates/conditions/allow-delete/const.ts

@@ -0,0 +1 @@
+export const UMB_TEMPLATE_ALLOW_DELETE_ACTION_CONDITION_ALIAS = 'Umb.Condition.Template.AllowDeleteAction';

src/packages/templating/templates/conditions/allow-delete/manifest.ts

@@ -0,0 +1,8 @@
+import { UMB_TEMPLATE_ALLOW_DELETE_ACTION_CONDITION_ALIAS } from './const.js';
+
+export const manifest: UmbExtensionManifest = {
+	type: 'condition',
+	name: 'Template Allow Delete Action Condition',
+	alias: UMB_TEMPLATE_ALLOW_DELETE_ACTION_CONDITION_ALIAS,
+	api: () => import('./template-allow-delete-action.condition.js'),
+};

src/packages/templating/templates/conditions/allow-delete/template-allow-delete-action.condition.ts

@@ -0,0 +1,22 @@
+import { UmbConditionBase } from '@umbraco-cms/backoffice/extension-registry';
+import { UMB_TREE_ITEM_CONTEXT } from '@umbraco-cms/backoffice/tree';
+import type { UmbConditionControllerArguments, UmbExtensionCondition } from '@umbraco-cms/backoffice/extension-api';
+import type { UmbControllerHost } from '@umbraco-cms/backoffice/controller-api';
+
+export class UmbTemplateAllowDeleteActionCondition extends UmbConditionBase<never> implements UmbExtensionCondition {
+	constructor(host: UmbControllerHost, args: UmbConditionControllerArguments<never>) {
+		super(host, args);
+
+		this.consumeContext(UMB_TREE_ITEM_CONTEXT, (context) => {
+			this.observe(
+				context.hasChildren,
+				(hasChildren) => {
+					this.permitted = hasChildren === false;
+				},
+				'_templateAllowDeleteActionCondition',
+			);
+		});
+	}
+}
+
+export { UmbTemplateAllowDeleteActionCondition as api };

src/packages/templating/templates/conditions/manifests.ts

@@ -0,0 +1,3 @@
+import { manifest as templateAllowDeleteActionCondition } from './allow-delete/manifest.js';
+
+export const manifests: Array<UmbExtensionManifest> = [templateAllowDeleteActionCondition];

src/packages/templating/templates/entity-actions/manifests.ts

@@ -1,5 +1,6 @@
 import { UMB_TEMPLATE_DETAIL_REPOSITORY_ALIAS, UMB_TEMPLATE_ITEM_REPOSITORY_ALIAS } from '../repository/index.js';
 import { UMB_TEMPLATE_ENTITY_TYPE, UMB_TEMPLATE_ROOT_ENTITY_TYPE } from '../entity.js';
+import { UMB_TEMPLATE_ALLOW_DELETE_ACTION_CONDITION_ALIAS } from '../conditions/allow-delete/const.js';
 
 export const manifests: Array<UmbExtensionManifest> = [
 	{
@@ -26,5 +27,6 @@ export const manifests: Array<UmbExtensionManifest> = [
 			detailRepositoryAlias: UMB_TEMPLATE_DETAIL_REPOSITORY_ALIAS,
 			itemRepositoryAlias: UMB_TEMPLATE_ITEM_REPOSITORY_ALIAS,
 		},
+		conditions: [{ alias: UMB_TEMPLATE_ALLOW_DELETE_ACTION_CONDITION_ALIAS }],
 	},
 ];

src/packages/templating/templates/manifests.ts

@@ -1,3 +1,4 @@
+import { manifests as conditionsManifests } from './conditions/manifests.js';
 import { manifests as entityActionsManifests } from './entity-actions/manifests.js';
 import { manifests as menuManifests } from './menu/manifests.js';
 import { manifests as modalManifests } from './modals/manifests.js';
@@ -7,6 +8,7 @@ import { manifests as treeManifests } from './tree/manifests.js';
 import { manifests as workspaceManifests } from './workspace/manifests.js';
 
 export const manifests: Array<UmbExtensionManifest> = [
+	...conditionsManifests,
 	...entityActionsManifests,
 	...menuManifests,
 	...modalManifests,