refactor(editor): merge get surface util (#9371)

blocksuite/affine/block-surface/src/utils/get-surface-block.ts

@@ -0,0 +1,8 @@
+import type { Doc } from '@blocksuite/store';
+
+import type { SurfaceBlockModel } from '../surface-model';
+
+export function getSurfaceBlock(doc: Doc) {
+  const blocks = doc.getBlocksByFlavour('affine:surface');
+  return blocks.length !== 0 ? (blocks[0].model as SurfaceBlockModel) : null;
+}

blocksuite/affine/block-surface/src/utils/index.ts

@@ -34,3 +34,4 @@ export function normalizeWheelDeltaY(delta: number, zoom = 1) {
 }
 
 export { getLastPropsKey } from './get-last-props-key';
+export { getSurfaceBlock } from './get-surface-block';