chore: merge blocksuite source code (#9213)

blocksuite/framework/block-std/src/event/utils.ts

@@ -0,0 +1,17 @@
+import type { IPoint } from '@blocksuite/global/utils';
+
+export function isFarEnough(a: IPoint, b: IPoint) {
+  const dx = a.x - b.x;
+  const dy = a.y - b.y;
+  return Math.pow(dx, 2) + Math.pow(dy, 2) > 4;
+}
+
+export function center(a: IPoint, b: IPoint) {
+  return {
+    x: (a.x + b.x) / 2,
+    y: (a.y + b.y) / 2,
+  };
+}
+
+export const toLowerCase = <T extends string>(str: T): Lowercase<T> =>
+  str.toLowerCase() as Lowercase<T>;