refactor(editor): rename block-std to std (#11250)

Closes: BS-2946

blocksuite/framework/std/src/selection/cursor.ts

@@ -0,0 +1,45 @@
+import { BaseSelection, SelectionExtension } from '@blocksuite/store';
+import z from 'zod';
+
+const CursorSelectionSchema = z.object({
+  x: z.number(),
+  y: z.number(),
+});
+
+export class CursorSelection extends BaseSelection {
+  static override group = 'gfx';
+
+  static override type = 'cursor';
+
+  readonly x: number;
+
+  readonly y: number;
+
+  constructor(x: number, y: number) {
+    super({ blockId: '[gfx-cursor]' });
+    this.x = x;
+    this.y = y;
+  }
+
+  static override fromJSON(json: Record<string, unknown>): CursorSelection {
+    const { x, y } = CursorSelectionSchema.parse(json);
+    return new CursorSelection(x, y);
+  }
+
+  override equals(other: BaseSelection): boolean {
+    if (other instanceof CursorSelection) {
+      return this.x === other.x && this.y === other.y;
+    }
+    return false;
+  }
+
+  override toJSON(): Record<string, unknown> {
+    return {
+      type: 'cursor',
+      x: this.x,
+      y: this.y,
+    };
+  }
+}
+
+export const CursorSelectionExtension = SelectionExtension(CursorSelection);