Add delay render support.

packages/editor/cypress/e2e/relationship.cy.js

@@ -11,10 +11,16 @@ context('Relationship Topics', () => {
     cy.contains('Try it Now!').first().click();
  
     cy.get('[test-id="11-15-relationship"]').first().click({ force: true });
+    cy.get('[test-id="11-15-relationship"]').should('exist');
+
     cy.matchImageSnapshot('addRelationship');
   });
 
   it('Delete Relationship', () => {
+    cy.contains('Features').first().click();
+    cy.get(`[aria-label="Add Relationship"]`).first().click();
+    cy.contains('Try it Now!').first().click();
+
     cy.get('[test-id="11-15-relationship"]').click({ force: true });
     cy.get('body').type('{backspace}');
 

packages/editor/src/classes/model/editor/index.ts

@@ -32,7 +32,7 @@ class Editor {
   }
 
   isMapLoadded(): boolean {
-    return this.component?.getDesigner()?.getMindmap() != null;
+    return this.component.isLoaded();
   }
 
   save(minor: boolean): void {
@@ -57,9 +57,9 @@ class Editor {
     mapId: string,
     persistenceManager: PersistenceManager,
     widgetManager: WidgetManager,
-  ): void {
+  ): Promise<void> {
     this.component.buildDesigner(persistenceManager, widgetManager);
-    this.component.loadMap(mapId);
+    return this.component.loadMap(mapId);
   }
 
   registerEvents(canvasUpdate: (timestamp: number) => void, capability: Capability): void {

packages/editor/src/components/index.tsx

@@ -79,10 +79,12 @@ const Editor = ({
   const capability = new Capability(options.mode, mapInfo.isLocked());
 
   const mindplotRef = useCallback((component: MindplotWebComponent) => {
-    // Initialized model ...
     const model = new Model(component);
-    model.loadMindmap(mapInfo.getId(), persistenceManager, widgetManager);
-    model.registerEvents(setCanvasUpdate, capability);
+
+    // Force refresh after map load ...
+    model.loadMindmap(mapInfo.getId(), persistenceManager, widgetManager).then(() => {
+      setCanvasUpdate(Date.now());
+    });
     setModel(model);
   }, []);
 
@@ -137,7 +139,7 @@ const Editor = ({
           message={mapInfo.isLocked() ? mapInfo.getLockedMessage() : ''}
         />
 
-        {!model && (
+        {!model?.isMapLoadded() && (
           <SpinnerCentered>
             <Vortex
               visible={true}

packages/editor/test/playground/map-render/js/viewmode.tsx

@@ -42,9 +42,10 @@ const container = document.getElementById('root');
 const root = createRoot(container!);
 root.render(
   <Editor
-    mapInfo={new MapInfoImpl('welcome', 'Develop Map Title', false)}
+    mapInfo={new MapInfoImpl(mapId, 'Develop Map Title', false)}
     options={options}
     persistenceManager={persistence}
     onAction={(action) => console.log('action called:', action)}
     onLoad={initialization}
-  />);
+  />,
+);

packages/mindplot/src/components/Designer.ts

@@ -577,14 +577,12 @@ class Designer extends Events {
     return { zoom: model.getZoom() };
   }
 
-  /**
-   * @param {mindplot.Mindmap} mindmap
-   * @throws will throw an error if mindmapModel is null or undefined
-   */
-  loadMap(mindmap: Mindmap): void {
+  loadMap(mindmap: Mindmap): Promise<void> {
     $assert(mindmap, 'mindmapModel can not be null');
     this._mindmap = mindmap;
 
+    this._workspace.enableQueueRender(true);
+
     // Init layout manager ...
     const size = { width: 25, height: 25 };
     const layoutManager = new LayoutManager(mindmap.getCentralTopic().getId(), size);
@@ -601,23 +599,29 @@ class Designer extends Events {
 
     // Building node graph ...
     const branches = mindmap.getBranches();
+
+    const nodesGraph: Topic[] = [];
     branches.forEach((branch) => {
       const nodeGraph = this.nodeModelToTopic(branch);
-      nodeGraph.setBranchVisibility(true);
+      nodesGraph.push(nodeGraph);
     });
 
-    // Connect relationships ...
-    const relationships = mindmap.getRelationships();
-    relationships.forEach((relationship) => this._relationshipModelToRelationship(relationship));
-
     // Place the focus on the Central Topic
     const centralTopic = this.getModel().getCentralTopic();
     this.goToNode(centralTopic);
 
-    // Finally, sort the map ...
-    EventBus.instance.fireEvent('forceLayout');
+    return this._workspace.enableQueueRender(false).then(() => {
+      // Connect relationships ...
+      const relationships = mindmap.getRelationships();
+      relationships.forEach((relationship) => this._relationshipModelToRelationship(relationship));
 
-    this.fireEvent('loadSuccess');
+      // Render nodes ...
+      nodesGraph.forEach((topic) => topic.setVisibility(true));
+
+      // Finally, sort the map ...
+      EventBus.instance.fireEvent('forceLayout');
+      this.fireEvent('loadSuccess');
+    });
   }
 
   getMindmap(): Mindmap {

packages/mindplot/src/components/MindplotWebComponent.ts

@@ -3,7 +3,6 @@ import buildDesigner from './DesignerBuilder';
 import DesignerOptionsBuilder from './DesignerOptionsBuilder';
 import EditorRenderMode from './EditorRenderMode';
 import LocalStorageManager from './LocalStorageManager';
-import Mindmap from './model/Mindmap';
 import PersistenceManager from './PersistenceManager';
 import WidgetManager from './WidgetManager';
 import mindplotStyles from './styles/mindplot-styles';
@@ -27,12 +26,12 @@ export type MindplotWebComponentInterface = {
 class MindplotWebComponent extends HTMLElement {
   private _shadowRoot: ShadowRoot;
 
-  private _mindmap: Mindmap;
-
   private _designer: Designer;
 
   private saveRequired: boolean;
 
+  private _isLoaded: boolean;
+
   constructor() {
     super();
     this._shadowRoot = this.attachShadow({ mode: 'open' });
@@ -77,6 +76,16 @@ class MindplotWebComponent extends HTMLElement {
     });
 
     this.registerShortcuts();
+
+    this._designer.addEvent('loadSuccess', (): void => {
+      this._isLoaded = true;
+    });
+
+    return this._designer;
+  }
+
+  isLoaded(): boolean {
+    return this._isLoaded;
   }
 
   private registerShortcuts() {
@@ -100,10 +109,9 @@ class MindplotWebComponent extends HTMLElement {
    * Load map in designer throught persistence manager instance
    * @param id the map id to be loaded.
    */
-  async loadMap(id: string): Promise<void> {
+  loadMap(id: string): Promise<void> {
     const instance = PersistenceManager.getInstance();
-    this._mindmap = await instance.load(id);
-    this._designer.loadMap(this._mindmap);
+    return instance.load(id).then((mindmap) => this._designer.loadMap(mindmap));
   }
 
   /**

packages/mindplot/src/components/PersistenceManager.ts

@@ -61,12 +61,11 @@ abstract class PersistenceManager {
     return result;
   }
 
-  load(mapId: string): Promise<Mindmap> {
+  async load(mapId: string): Promise<Mindmap> {
     $assert(mapId, 'mapId can not be null');
-    return this.loadMapDom(mapId).then((document) => {
-      console.log(`Loading map with is ${mapId}}`);
-      return PersistenceManager.loadFromDom(mapId, document);
-    });
+    // eslint-disable-next-line arrow-body-style
+    const document = await this.loadMapDom(mapId);
+    return PersistenceManager.loadFromDom(mapId, document);
   }
 
   triggerError(error: PersistenceError) {

packages/mindplot/src/components/Workspace.ts

@@ -35,6 +35,10 @@ class Workspace {
 
   private _visibleAreaSize: SizeType;
 
+  private _renderQueue: Element2D[];
+
+  private queueRenderEnabled: boolean;
+
   constructor(screenManager: ScreenManager, zoom: number, isReadOnly: boolean) {
     // Create a suitable container ...
     $assert(screenManager, 'Div container can not be null');
@@ -66,6 +70,8 @@ class Workspace {
     });
 
     this.setZoom(zoom, true);
+
+    this._renderQueue = [];
   }
 
   private _adjustWorkspace(): void {
@@ -97,6 +103,14 @@ class Workspace {
   }
 
   append(shape: Element2D): void {
+    if (this.queueRenderEnabled) {
+      this._renderQueue.push(shape);
+    } else {
+      this.appendInternal(shape);
+    }
+  }
+
+  private appendInternal(shape: Element2D): void {
     if ($defined(shape.addToWorkspace)) {
       shape.addToWorkspace(this);
     } else {
@@ -104,6 +118,37 @@ class Workspace {
     }
   }
 
+  enableQueueRender(value: boolean): Promise<void> {
+    this.queueRenderEnabled = value;
+
+    let result = Promise.resolve();
+    if (!value) {
+      result = this.processRenderQueue(this._renderQueue.reverse(), 300);
+    }
+    return result;
+  }
+
+  private processRenderQueue(renderQueue: Element2D[], batch: number): Promise<void> {
+    function delay(t: number) {
+      return new Promise((resolve) => setTimeout(resolve, t));
+    }
+
+    let result: Promise<void>;
+    if (renderQueue.length > 0) {
+      result = new Promise((resolve: (queue: Element2D[]) => void) => {
+        for (let i = 0; i < batch && renderQueue.length > 0; i++) {
+          const elem = renderQueue.pop();
+          this.appendInternal(elem);
+        }
+
+        resolve(renderQueue);
+      }).then((queue) => delay(30).then(() => this.processRenderQueue(queue, batch)));
+    } else {
+      result = Promise.resolve();
+    }
+    return result;
+  }
+
   removeChild(shape: Element2D): void {
     // Element is a node, not a web2d element?
     if ($defined(shape.removeFromWorkspace)) {

packages/web2d/src/components/peer/svg/TextPeer.js

@@ -159,12 +159,7 @@ class TextPeer extends ElementPeer {
   }
 
   getWidth() {
-    let computedWidth = this._native.getBBox().width;
-    if (computedWidth === 0) {
-      const bbox = this._native.getBBox();
-      computedWidth = bbox.width;
-    }
-
+    const computedWidth = this._native.getBBox().width;
     let width = parseInt(computedWidth, 10);
     width += this._font.getWidthMargin();
     return width;