Duplicates single and multiple topics in the agenda

client/src/app/core/repositories/topics/topic-repository.service.ts

@@ -10,6 +10,7 @@ import { ViewModelStoreService } from 'app/core/core-services/view-model-store.s
 import { RelationDefinition } from 'app/core/definitions/relations';
 import { Topic } from 'app/shared/models/topics/topic';
 import { ViewMediafile } from 'app/site/mediafiles/models/view-mediafile';
+import { CreateTopic } from 'app/site/topics/models/create-topic';
 import { TopicTitleInformation, ViewTopic } from 'app/site/topics/models/view-topic';
 import { BaseIsAgendaItemAndListOfSpeakersContentObjectRepository } from '../base-is-agenda-item-and-list-of-speakers-content-object-repository';
 
@@ -72,4 +73,15 @@ export class TopicRepositoryService extends BaseIsAgendaItemAndListOfSpeakersCon
     public getVerboseName = (plural: boolean = false) => {
         return this.translate.instant(plural ? 'Topics' : 'Topic');
     };
+
+    public duplicateTopic(topic: ViewTopic): void {
+        this.create(
+            new CreateTopic({
+                ...topic.topic,
+                agenda_type: topic.item.type,
+                agenda_parent_id: topic.item.parent_id,
+                agenda_weight: topic.item.weight
+            })
+        );
+    }
 }

client/src/app/site/agenda/components/agenda-list/agenda-list.component.html

@@ -180,6 +180,12 @@
             </button>
             <mat-divider></mat-divider>
 
+            <!-- Duplicate items -->
+            <button mat-menu-item [disabled]="!selectedRows.length" (click)="duplicateMultipleTopics(selectedRows)">
+                <mat-icon>file_copy</mat-icon>
+                <span>{{ 'Create copy of selected topics' | translate }}</span>
+            </button>
+
             <!-- Delete selected -->
             <button mat-menu-item [disabled]="!selectedRows.length" (click)="removeSelected()">
                 <mat-icon>remove</mat-icon>
@@ -211,22 +217,19 @@
                 <span>{{ 'Edit details' | translate }}</span>
             </button>
 
+            <!-- Duplicate button -->
+            <button mat-menu-item (click)="duplicateTopic(item.contentObject)" *ngIf="isTopic(item.contentObject)">
+                <mat-icon>file_copy</mat-icon>
+                <span>{{ 'Create copy' | translate }}</span>
+            </button>
+
             <!-- Delete Button -->
-            <button
-                mat-menu-item
-                (click)="removeFromAgenda(item)"
-                *ngIf="item.contentObjectData.collection !== 'topics/topic'"
-            >
+            <button mat-menu-item (click)="removeFromAgenda(item)" *ngIf="!isTopic(item.contentObject)">
                 <mat-icon>remove</mat-icon>
                 <span>{{ 'Remove from agenda' | translate }}</span>
             </button>
 
-            <button
-                mat-menu-item
-                class="red-warning-text"
-                (click)="deleteTopic(item)"
-                *ngIf="item.contentObjectData.collection === 'topics/topic'"
-            >
+            <button mat-menu-item class="red-warning-text" (click)="deleteTopic(item)" *ngIf="isTopic(item.contentObject)">
                 <mat-icon>delete</mat-icon>
                 <span>{{ 'Delete' | translate }}</span>
             </button>

client/src/app/site/agenda/components/agenda-list/agenda-list.component.ts

@@ -350,4 +350,43 @@ export class AgendaListComponent extends BaseListViewComponent<ViewItem> impleme
             this.listOfSpeakersRepo.deleteAllSpeakersOfAllListsOfSpeakers().catch(this.raiseError);
         }
     }
+
+    /**
+     * Duplicates a single selected item.
+     *
+     * @param item The item to duplicte.
+     */
+    public duplicateTopic(topic: ViewTopic): void {
+        this.topicRepo.duplicateTopic(topic);
+    }
+
+    /**
+     * Duplicates all selected items, that are topics.
+     *
+     * @param selectedItems All selected items.
+     */
+    public duplicateMultipleTopics(selectedItems: ViewItem[]): void {
+        for (const item of selectedItems) {
+            if (this.isTopic(item.contentObject)) {
+                this.duplicateTopic(item.contentObject);
+            }
+        }
+    }
+
+    /**
+     * Helper function to determine, if the given item is a `Topic`.
+     *
+     * @param item The selected item.
+     *
+     * @returns `true` if the given item's collection is equal to the `Topic.COLLECTIONSTRING`.
+     */
+    public isTopic(obj: any): obj is ViewTopic {
+        const topic = obj as ViewTopic;
+        return (
+            !!topic &&
+            topic.collectionString !== undefined &&
+            topic.collectionString === ViewTopic.COLLECTIONSTRING &&
+            !!topic.topic
+        );
+    }
 }

client/src/app/site/topics/models/view-topic.ts

@@ -17,6 +17,10 @@ export interface TopicTitleInformation extends TitleInformationWithAgendaItem {
 export class ViewTopic extends BaseViewModelWithAgendaItemAndListOfSpeakers<Topic> implements TopicTitleInformation {
     public static COLLECTIONSTRING = Topic.COLLECTIONSTRING;
 
+    public get topic(): Topic {
+        return this._model;
+    }
+
     /**
      * Formats the category for search
      *