OpenSlides ♥ Trees

client/src/app/core/services/tree.service.spec.ts

@@ -0,0 +1,17 @@
+import { TestBed, inject } from '@angular/core/testing';
+
+import { TreeService } from './tree.service';
+import { E2EImportsModule } from '../../../e2e-imports.module';
+
+describe('TreeService', () => {
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            imports: [E2EImportsModule],
+            providers: [TreeService]
+        });
+    });
+
+    it('should be created', inject([TreeService], (service: TreeService) => {
+        expect(service).toBeTruthy();
+    }));
+});

client/src/app/core/services/tree.service.ts

@@ -0,0 +1,142 @@
+import { Injectable } from '@angular/core';
+
+import { OpenSlidesComponent } from 'app/openslides.component';
+import { Displayable } from 'app/shared/models/base/displayable';
+import { Identifiable } from 'app/shared/models/base/identifiable';
+
+/**
+ * A representation of nodes in our tree. Saves the displayed name, the id, the element and children to build a full tree.
+ */
+export interface OSTreeNode<T> {
+    name: string;
+    id: number;
+    item: T;
+    children?: OSTreeNode<T>[];
+}
+
+/**
+ * This services handles all operations belonging to trees. It can build trees of plain lists (giving the weight
+ * and parentId property) and traverse the trees in pre-order.
+ */
+@Injectable({
+    providedIn: 'root'
+})
+export class TreeService extends OpenSlidesComponent {
+    /**
+     * Yes, a constructor.
+     */
+    public constructor() {
+        super();
+    }
+
+    /**
+     * Returns the weight casted to a number from a given model.
+     *
+     * @param item The model to get the weight from.
+     * @param key
+     * @returns the weight of the model
+     */
+    private getAttributeAsNumber<T extends Identifiable & Displayable>(item: T, key: keyof T): number {
+        return (<any>item[key]) as number;
+    }
+
+    /**
+     * Build our representation of a tree node given the model and optional children
+     * to append to this node.
+     *
+     * @param item The model to create a node of.
+     * @param children Optional children to append to this node.
+     * @returns The created node.
+     */
+    private buildTreeNode<T extends Identifiable & Displayable>(item: T, children?: OSTreeNode<T>[]): OSTreeNode<T> {
+        return {
+            name: item.getTitle(),
+            id: item.id,
+            item: item,
+            children: children
+        };
+    }
+
+    /**
+     * Builds a tree from the given items on the relations between items with weight and parentId
+     *
+     * @param items All items to traverse
+     * @param weightKey The key giving access to the weight property
+     * @param parentIdKey The key giving access to the parentId property
+     * @returns An iterator for all items in the right order.
+     */
+    public makeTree<T extends Identifiable & Displayable>(
+        items: T[],
+        weightKey: keyof T,
+        parentIdKey: keyof T
+    ): OSTreeNode<T>[] {
+        // Sort items after their weight
+        items.sort((a, b) => this.getAttributeAsNumber(a, weightKey) - this.getAttributeAsNumber(b, weightKey));
+        // Build a dict with all children (dict-value) to a specific
+        // item id (dict-key).
+        const children: { [parendId: number]: T[] } = {};
+        items.forEach(model => {
+            if (model[parentIdKey]) {
+                const parentId = this.getAttributeAsNumber(model, parentIdKey);
+                if (children[parentId]) {
+                    children[parentId].push(model);
+                } else {
+                    children[parentId] = [model];
+                }
+            }
+        });
+        // Recursive function that generates a nested list with all
+        // items with there children
+        const getChildren: (_models?: T[]) => OSTreeNode<T>[] = _models => {
+            if (!_models) {
+                return;
+            }
+            const nodes: OSTreeNode<T>[] = [];
+            _models.forEach(_model => {
+                nodes.push(this.buildTreeNode(_model, getChildren(children[_model.id])));
+            });
+            return nodes;
+        };
+        // Generates the list of root items (with no parents)
+        const parentItems = items.filter(model => !this.getAttributeAsNumber(model, parentIdKey));
+        return getChildren(parentItems);
+    }
+
+    /**
+     * Traverses the given tree in pre order.
+     *
+     * @param tree The tree to traverse
+     * @returns An iterator for all items in the right order.
+     */
+    public *traverseTree<T>(tree: OSTreeNode<T>[]): Iterator<T> {
+        const nodesToVisit = tree.reverse();
+        while (nodesToVisit.length > 0) {
+            const node = nodesToVisit.pop();
+            if (node.children) {
+                node.children.reverse().forEach(n => {
+                    nodesToVisit.push(n);
+                });
+            }
+            yield node.item;
+        }
+    }
+
+    /**
+     * Traverses items in pre-order givem (implicit) by the weight and parentId.
+     *
+     * Just builds the tree with `makeTree` and get the iterator from `traverseTree`.
+     *
+     * @param items All items to traverse
+     * @param weightKey The key giving access to the weight property
+     * @param parentIdKey The key giving access to the parentId property
+     * @returns An iterator for all items in the right order.
+     */
+    public traverseItems<T extends Identifiable & Displayable>(
+        items: T[],
+        weightKey: keyof T,
+        parentIdKey: keyof T
+    ): Iterator<T> {
+        const tree = this.makeTree(items, weightKey, parentIdKey);
+        return this.traverseTree(tree);
+    }
+}

client/src/app/shared/components/sorting-tree/sorting-tree.component.ts

@@ -7,24 +7,16 @@ import { Subscription, Observable } from 'rxjs';
 
 import { Identifiable } from 'app/shared/models/base/identifiable';
 import { Displayable } from 'app/shared/models/base/displayable';
-
+import { OSTreeNode, TreeService } from 'app/core/services/tree.service';
-/**
- * An representation of our nodes. Saves the displayed name, the id and children to build a full tree.
- */
-interface OSTreeNode {
-    name: string;
-    id: number;
-    children?: OSTreeNode[];
-}
 
 /**
  * The data representation for the sort event.
  */
-export interface OSTreeSortEvent {
+export interface OSTreeSortEvent<T> {
     /**
      * Gives all nodes to be inserted below the parent_id.
      */
-    nodes: OSTreeNode[];
+    nodes: OSTreeNode<T>[];
 
     /**
      * Provides the parent id for the nodes array. Do not provide it, if it's the
@@ -62,8 +54,8 @@ export class SortingTreeComponent<T extends Identifiable & Displayable> implemen
         if (this.modelSubscription) {
             this.modelSubscription.unsubscribe();
         }
-        this.modelSubscription = models.pipe(auditTime(100)).subscribe(m => {
+        this.modelSubscription = models.pipe(auditTime(10)).subscribe(items => {
-            this.nodes = this.makeTree(m);
+            this.nodes = this.treeService.makeTree(items, this.weightKey, this.parentIdKey);
             setTimeout(() => this.tree.treeModel.expandAll());
         });
     }
@@ -93,7 +85,7 @@ export class SortingTreeComponent<T extends Identifiable & Displayable> implemen
      * sorted part of the tree.
      */
     @Output()
-    public readonly sort = new EventEmitter<OSTreeSortEvent>();
+    public readonly sort = new EventEmitter<OSTreeSortEvent<T>>();
 
     /**
      * Options for the tree. As a default drag and drop is allowed.
@@ -112,12 +104,12 @@ export class SortingTreeComponent<T extends Identifiable & Displayable> implemen
     /**
      * This is our actual tree represented by our own nodes.
      */
-    public nodes: OSTreeNode[] = [];
+    public nodes: OSTreeNode<T>[] = [];
 
     /**
      * Constructor. Adds the eventhandler for the drop event to the tree.
      */
-    public constructor() {
+    public constructor(private treeService: TreeService) {
         this.treeOptions.actionMapping = {
             mouse: {
                 drop: this.drop.bind(this)
@@ -149,9 +141,13 @@ export class SortingTreeComponent<T extends Identifiable & Displayable> implemen
      * @param param3 The previous and new position os the node
      */
     private drop(tree: TreeModel, node: TreeNode, $event: any, { from, to }: { from: any; to: any }): void {
-        // check if dropped itself
+        // check if dropped itself by going the tree upwards and check, if one of them is the "from"-node.
-        if (from.id === to.parent.id) {
+        let parent = to.parent;
-            return;
+        while (parent !== null) {
+            if (from.id === parent.id) {
+                return;
+            }
+            parent = parent.parent;
         }
 
         let parentId;
@@ -165,86 +161,4 @@ export class SortingTreeComponent<T extends Identifiable & Displayable> implemen
         transferArrayItem(fromArray, to.parent.data.children, from.index, to.index);
         this.sort.emit({ nodes: to.parent.data.children, parent_id: parentId });
     }
-
-    /**
-     * Returns the weight casted to a number from a given model.
-     *
-     * @param model The model to get the weight from.
-     * @returns the weight of the model
-     */
-    private getWeight(model: T): number {
-        return (<any>model[this.weightKey]) as number;
-    }
-
-    /**
-     * Returns the parent id casted to a number from a given model.
-     *
-     * @param model The model to get the parent id from.
-     * @returns the parent id of the model
-     */
-    private getParentId(model: T): number {
-        return (<any>model[this.parentIdKey]) as number;
-    }
-
-    /**
-     * Build our representation of a tree node given the model and optional children
-     * to append to this node.
-     *
-     * @param model The model to create a node of.
-     * @param children Optional children to append to this node.
-     * @returns The created node.
-     */
-    private buildTreeNode(model: T, children?: OSTreeNode[]): OSTreeNode {
-        return {
-            name: model.getTitle(),
-            id: model.id,
-            children: children
-        };
-    }
-
-    /**
-     * Creates a tree from the given models with their parent and weight properties.
-     *
-     * @param models All models to build the tree of
-     * @returns The first layer of the tree given as an array of nodes, because this tree may not have a single root.
-     */
-    private makeTree(models: T[]): OSTreeNode[] {
-        // copy references to avoid side effects:
-        models = models.map(x => x);
-
-        // Sort items after there weight
-        models.sort((a, b) => this.getWeight(a) - this.getWeight(b));
-
-        // Build a dict with all children (dict-value) to a specific
-        // item id (dict-key).
-        const children: { [parendId: number]: T[] } = {};
-
-        models.forEach(model => {
-            if (model[this.parentIdKey]) {
-                const parentId = this.getParentId(model);
-                if (children[parentId]) {
-                    children[parentId].push(model);
-                } else {
-                    children[parentId] = [model];
-                }
-            }
-        });
-
-        // Recursive function that generates a nested list with all
-        // items with there children
-        const getChildren: (_models?: T[]) => OSTreeNode[] = _models => {
-            if (!_models) {
-                return;
-            }
-            const nodes: OSTreeNode[] = [];
-            _models.forEach(_model => {
-                nodes.push(this.buildTreeNode(_model, getChildren(children[_model.id])));
-            });
-            return nodes;
-        };
-
-        // Generates the list of root items (with no parents)
-        const parentItems = models.filter(model => !this.getParentId(model));
-        return getChildren(parentItems);
-    }
 }

client/src/app/site/base/base-repository.ts

@@ -5,6 +5,7 @@ import { BaseModel, ModelConstructor } from '../../shared/models/base/base-model
 import { CollectionStringModelMapperService } from '../../core/services/collectionStringModelMapper.service';
 import { DataStoreService } from '../../core/services/data-store.service';
 import { Identifiable } from '../../shared/models/base/identifiable';
+import { auditTime } from 'rxjs/operators';
 
 export abstract class BaseRepository<V extends BaseViewModel, M extends BaseModel> extends OpenSlidesComponent {
     /**
@@ -20,7 +21,7 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
     /**
      * Observable subject for the whole list
      */
-    protected viewModelListSubject: BehaviorSubject<V[]> = new BehaviorSubject<V[]>(null);
+    protected readonly viewModelListSubject: BehaviorSubject<V[]> = new BehaviorSubject<V[]>([]);
 
     /**
      *
@@ -42,9 +43,12 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
         // Populate the local viewModelStore with ViewModel Objects.
         this.DS.getAll(this.baseModelCtor).forEach((model: M) => {
             this.viewModelStore[model.id] = this.createViewModel(model);
+        });
+        // Update the list and then all models on their own
+        this.updateViewModelListObservable();
+        this.DS.getAll(this.baseModelCtor).forEach((model: M) => {
             this.updateViewModelObservable(model.id);
         });
-        this.updateViewModelListObservable();
 
         // Could be raise in error if the root injector is not known
         this.DS.changeObservable.subscribe(model => {
@@ -131,10 +135,14 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
     }
 
     /**
-     * return the Observable of the whole store
+     * Return the Observable of the whole store.
+     *
+     * All data is piped through an auditTime of 1ms. This is to prevent massive
+     * updates, if e.g. an autoupdate with a lot motions come in. The result is just one
+     * update of the new list instead of many unnecessary updates.
      */
     public getViewModelListObservable(): Observable<V[]> {
-        return this.viewModelListSubject.asObservable();
+        return this.viewModelListSubject.asObservable().pipe(auditTime(1));
     }
 
     /**

client/src/app/site/motions/components/call-list/call-list.component.ts

@@ -56,8 +56,11 @@ export class CallListComponent extends BaseViewComponent {
     /**
      * Handler for the sort event. The data to change is given to
      * the repo, sending it to the server.
+     *
+     * @param data The event data. The representation fits the servers requirements, so it can directly
+     * be send to the server via the repository.
      */
-    public sort(data: OSTreeSortEvent): void {
+    public sort(data: OSTreeSortEvent<ViewMotion>): void {
         this.motionRepo.sortMotions(data).then(null, this.raiseError);
     }
 

client/src/app/site/motions/components/motion-list/motion-list.component.ts

@@ -75,8 +75,8 @@ export class MotionListComponent extends ListViewBaseComponent<ViewMotion> imple
         this.repo.getViewModelListObservable().subscribe(newMotions => {
             // TODO: This is for testing purposes. Can be removed with #3963
             this.dataSource.data = newMotions.sort((a, b) => {
-                if (a.weight !== b.weight) {
+                if (a.callListWeight !== b.callListWeight) {
-                    return a.weight - b.weight;
+                    return a.callListWeight - b.callListWeight;
                 } else {
                     return a.id - b.id;
                 }

client/src/app/site/motions/models/view-motion.ts

@@ -62,6 +62,12 @@ export class ViewMotion extends BaseViewModel {
      */
     public highlightedLine: number;
 
+    /**
+     * Is set by the repository; this is the order of the flat call list given by
+     * the properties weight and sort_parent_id
+     */
+    public callListWeight: number;
+
     public get motion(): Motion {
         return this._motion;
     }
@@ -179,7 +185,7 @@ export class ViewMotion extends BaseViewModel {
     }
 
     public get agendaSpeakerAmount(): number {
-        return this.item ? this.item.speakerAmount : null
+        return this.item ? this.item.speakerAmount : null;
     }
 
     public constructor(
@@ -189,7 +195,7 @@ export class ViewMotion extends BaseViewModel {
         supporters?: User[],
         workflow?: Workflow,
         state?: WorkflowState,
-        item?: Item,
+        item?: Item
     ) {
         super();
 

client/src/app/site/motions/services/motion-repository.service.ts

@@ -1,5 +1,8 @@
 import { Injectable } from '@angular/core';
 
+import { Observable } from 'rxjs';
+import { tap } from 'rxjs/operators';
+
 import { DataSendService } from '../../../core/services/data-send.service';
 import { Motion } from '../../../shared/models/motions/motion';
 import { User } from '../../../shared/models/users/user';
@@ -20,6 +23,7 @@ import { CollectionStringModelMapperService } from '../../../core/services/colle
 import { HttpService } from 'app/core/services/http.service';
 import { Item } from 'app/shared/models/agenda/item';
 import { OSTreeSortEvent } from 'app/shared/components/sorting-tree/sorting-tree.component';
+import { TreeService } from 'app/core/services/tree.service';
 
 /**
  * Repository Services for motions (and potentially categories)
@@ -51,7 +55,8 @@ export class MotionRepositoryService extends BaseRepository<ViewMotion, Motion>
         private dataSend: DataSendService,
         private httpService: HttpService,
         private readonly lineNumbering: LinenumberingService,
-        private readonly diff: DiffService
+        private readonly diff: DiffService,
+        private treeService: TreeService
     ) {
         super(DS, mapperService, Motion, [Category, User, Workflow, Item]);
     }
@@ -77,6 +82,19 @@ export class MotionRepositoryService extends BaseRepository<ViewMotion, Motion>
         return new ViewMotion(motion, category, submitters, supporters, workflow, state, item);
     }
 
+    public getViewModelListObservable(): Observable<ViewMotion[]> {
+        return super.getViewModelListObservable().pipe(
+            tap(motions => {
+                const iterator = this.treeService.traverseItems(motions, 'weight', 'sort_parent_id');
+                let m: IteratorResult<ViewMotion>;
+                let virtualWeightCounter = 0;
+                while (!(m = iterator.next()).done) {
+                    m.value.callListWeight = virtualWeightCounter++;
+                }
+            })
+        );
+    }
+
     /**
      * Creates a motion
      * Creates a (real) motion with patched data and delegate it
@@ -146,7 +164,7 @@ export class MotionRepositoryService extends BaseRepository<ViewMotion, Motion>
      *
      * @param data The reordered data from the sorting
      */
-    public async sortMotions(data: OSTreeSortEvent): Promise<void> {
+    public async sortMotions(data: OSTreeSortEvent<ViewMotion>): Promise<void> {
         const url = '/rest/motions/motion/sort/';
         await this.httpService.post(url, data);
     }