refactor(editor): improve std structure (#10993)

blocksuite/framework/block-std/src/selection/surface.ts

@@ -0,0 +1,70 @@
+import { BaseSelection, SelectionExtension } from '@blocksuite/store';
+import z from 'zod';
+
+const SurfaceSelectionSchema = z.object({
+  blockId: z.string(),
+  elements: z.array(z.string()),
+  editing: z.boolean(),
+  inoperable: z.boolean().optional(),
+});
+
+export class SurfaceSelection extends BaseSelection {
+  static override group = 'gfx';
+
+  static override type = 'surface';
+
+  readonly editing: boolean;
+
+  readonly elements: string[];
+
+  readonly inoperable: boolean;
+
+  constructor(
+    blockId: string,
+    elements: string[],
+    editing: boolean,
+    inoperable = false
+  ) {
+    super({ blockId });
+
+    this.elements = elements;
+    this.editing = editing;
+    this.inoperable = inoperable;
+  }
+
+  static override fromJSON(json: Record<string, unknown>): SurfaceSelection {
+    const { blockId, elements, editing, inoperable } =
+      SurfaceSelectionSchema.parse(json);
+    return new SurfaceSelection(blockId, elements, editing, inoperable);
+  }
+
+  override equals(other: BaseSelection): boolean {
+    if (other instanceof SurfaceSelection) {
+      return (
+        this.blockId === other.blockId &&
+        this.editing === other.editing &&
+        this.inoperable === other.inoperable &&
+        this.elements.length === other.elements.length &&
+        this.elements.every((id, idx) => id === other.elements[idx])
+      );
+    }
+
+    return false;
+  }
+
+  isEmpty() {
+    return this.elements.length === 0 && !this.editing;
+  }
+
+  override toJSON(): Record<string, unknown> {
+    return {
+      type: 'surface',
+      blockId: this.blockId,
+      elements: this.elements,
+      editing: this.editing,
+      inoperable: this.inoperable,
+    };
+  }
+}
+
+export const SurfaceSelectionExtension = SelectionExtension(SurfaceSelection);