feat(core/reports): add AjfWidgetService for custom widgets definition

src/core/reports/public-api.ts

@@ -74,6 +74,7 @@ export * from './serializers/widget-serializer';
 export * from './widget';
 export * from './widget-components-map';
 export * from './widget-host';
+export * from './widget-service';
 
 export * from './utils/aggregation/create-aggregation';
 export * from './utils/reports-instances/create-report-instance';

src/core/reports/widget-service.ts

@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright (C) Gnucoop soc. coop.
+ *
+ * This file is part of the Advanced JSON forms (ajf).
+ *
+ * Advanced JSON forms (ajf) is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Advanced JSON forms (ajf) is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Advanced JSON forms (ajf).
+ * If not, see http://www.gnu.org/licenses/.
+ *
+ */
+
+import {Type} from '@angular/core';
+
+import {AjfBaseWidgetComponent} from './base-widget';
+import {AjfWidgetComponentsMap} from './widget-components-map';
+
+export abstract class AjfWidgetService {
+  readonly componentsMap: AjfWidgetComponentsMap = {};
+
+  registerCustomWidget(widget: {
+    widgetType: number,
+    component: Type<AjfBaseWidgetComponent>,
+    inputs?: {[key: string]: any},
+  }): void {
+    const {widgetType, component} = widget;
+    if (widgetType < 100) {
+      throw new Error('Invalid custom widget type, it must be greater than 100');
+    }
+    if (component == null) {
+      throw new Error('Invalid custom widget component');
+    }
+    this.componentsMap[widgetType] = widget;
+  }
+}

tools/public_api_guard/core/reports.d.ts

@@ -322,6 +322,17 @@ export declare class AjfWidgetSerializer {
     static fromJson(json: Partial<AjfWidget>): AjfWidget;
 }
 
+export declare abstract class AjfWidgetService {
+    readonly componentsMap: AjfWidgetComponentsMap;
+    registerCustomWidget(widget: {
+        widgetType: number;
+        component: Type<AjfBaseWidgetComponent>;
+        inputs?: {
+            [key: string]: any;
+        };
+    }): void;
+}
+
 export declare enum AjfWidgetType {
     Layout = 0,
     PageBreak = 1,