refactor(editor): reduce redundant canvas refresh on init (#10364)

blocksuite/affine/block-root/src/edgeless/edgeless-root-block.ts

@@ -553,6 +553,8 @@ export class EdgelessRootBlockComponent extends BlockComponent<
       this.gfx.tool.setTool('default');
     }
 
+    this.gfx.viewport.elementReady.emit(this.gfxViewportElm);
+
     requestConnectedFrame(() => {
       this.requestUpdate();
     }, this);

blocksuite/affine/shared/src/viewport-renderer/dom-utils.ts

@@ -103,7 +103,7 @@ export function initTweakpane(
   debugPane.title = 'Viewport Turbo Renderer';
 
   debugPane
-    .addBinding({ paused: true }, 'paused', {
+    .addBinding({ paused: false }, 'paused', {
       label: 'Paused',
     })
     .on('change', ({ value }) => {

blocksuite/affine/shared/src/viewport-renderer/viewport-renderer.ts

@@ -50,14 +50,20 @@ export class ViewportTurboRendererExtension extends LifeCycleWatcher {
   }
 
   override mounted() {
-    const viewportElement = document.querySelector('.affine-edgeless-viewport');
-    if (viewportElement) {
-      viewportElement.append(this.canvas);
-      initTweakpane(this, viewportElement as HTMLElement);
+    const mountPoint = document.querySelector('.affine-edgeless-viewport');
+    if (mountPoint) {
+      mountPoint.append(this.canvas);
+      initTweakpane(this, mountPoint as HTMLElement);
     }
-    syncCanvasSize(this.canvas, this.std.host);
-    this.viewport.viewportUpdated.on(() => {
-      this.refresh().catch(console.error);
+
+    this.viewport.elementReady.once(() => {
+      syncCanvasSize(this.canvas, this.std.host);
+      this.state = 'monitoring';
+      this.disposables.add(
+        this.viewport.viewportUpdated.on(() => {
+          this.refresh().catch(console.error);
+        })
+      );
     });
 
     const debounceOptions = { leading: false, trailing: true };
@@ -72,11 +78,6 @@ export class ViewportTurboRendererExtension extends LifeCycleWatcher {
         debouncedLayoutUpdate();
       })
     );
-
-    document.fonts.load('15px Inter').then(() => {
-      // this.state = 'monitoring';
-      this.refresh().catch(console.error);
-    });
   }
 
   override unmounted() {

blocksuite/framework/block-std/src/gfx/controller.ts

@@ -274,7 +274,7 @@ export class GfxController extends LifeCycleWatcher {
   }
 
   override mounted() {
-    this.viewport.setViewportElement(this.std.host);
+    this.viewport.setShellElement(this.std.host);
     this.std.provider.getAll(GfxExtensionIdentifier).forEach(ext => {
       ext.mounted();
     });

blocksuite/framework/block-std/src/gfx/viewport.ts

@@ -7,6 +7,8 @@ import {
   Vec,
 } from '@blocksuite/global/utils';
 
+import type { GfxViewportElement } from '.';
+
 function cutoff(value: number, ref: number, sign: number) {
   if (sign > 0 && value > ref) return ref;
   if (sign < 0 && value < ref) return ref;
@@ -29,7 +31,9 @@ export class Viewport {
 
   protected _center: IPoint = { x: 0, y: 0 };
 
-  protected _el: HTMLElement | null = null;
+  protected _shell: HTMLElement | null = null;
+
+  protected _element: GfxViewportElement | null = null;
 
   protected _height = 0;
 
@@ -45,6 +49,8 @@ export class Viewport {
 
   protected _zoom: number = 1.0;
 
+  elementReady = new Slot<GfxViewportElement>();
+
   sizeUpdated = new Slot<{
     width: number;
     height: number;
@@ -60,14 +66,22 @@ export class Viewport {
 
   ZOOM_MIN = ZOOM_MIN;
 
+  constructor() {
+    this.elementReady.once(el => (this._element = el));
+  }
+
   get boundingClientRect() {
-    if (!this._el) return new DOMRect(0, 0, 0, 0);
+    if (!this._shell) return new DOMRect(0, 0, 0, 0);
     if (!this._cachedBoundingClientRect) {
-      this._cachedBoundingClientRect = this._el.getBoundingClientRect();
+      this._cachedBoundingClientRect = this._shell.getBoundingClientRect();
     }
     return this._cachedBoundingClientRect;
   }
 
+  get element() {
+    return this._element;
+  }
+
   get center() {
     return this._center;
   }
@@ -103,7 +117,7 @@ export class Viewport {
    * This property is used to calculate the scale of the editor.
    */
   get viewScale() {
-    if (!this._el || this._cachedOffsetWidth === null) return 1;
+    if (!this._shell || this._cachedOffsetWidth === null) return 1;
     return this.boundingClientRect.width / this._cachedOffsetWidth;
   }
 
@@ -168,12 +182,12 @@ export class Viewport {
   }
 
   clearViewportElement() {
-    if (this._resizeObserver && this._el) {
-      this._resizeObserver.unobserve(this._el);
+    if (this._resizeObserver && this._shell) {
+      this._resizeObserver.unobserve(this._shell);
       this._resizeObserver.disconnect();
     }
     this._resizeObserver = null;
-    this._el = null;
+    this._shell = null;
     this._cachedBoundingClientRect = null;
     this._cachedOffsetWidth = null;
   }
@@ -222,10 +236,10 @@ export class Viewport {
   }
 
   onResize() {
-    if (!this._el) return;
+    if (!this._shell) return;
     const { centerX, centerY, zoom, width: oldWidth, height: oldHeight } = this;
     const { left, top, width, height } = this.boundingClientRect;
-    this._cachedOffsetWidth = this._el.offsetWidth;
+    this._cachedOffsetWidth = this._shell.offsetWidth;
 
     this.setRect(left, top, width, height);
     this.setCenter(
@@ -331,8 +345,9 @@ export class Viewport {
     this.setViewport(zoom, center, smooth);
   }
 
-  setViewportElement(el: HTMLElement) {
-    this._el = el;
+  /** This is the outer container of the viewport, which is the host of the viewport element */
+  setShellElement(el: HTMLElement) {
+    this._shell = el;
     this._cachedBoundingClientRect = el.getBoundingClientRect();
     this._cachedOffsetWidth = el.offsetWidth;