feat(@vant/use): add useRect

packages/vant-use/src/useRect/index.ts

@@ -0,0 +1,38 @@
+import { Ref, unref } from 'vue';
+
+function isWindow(val: unknown): val is Window {
+  return val === window;
+}
+
+export const useRect = (
+  elementRef: (Element | Window) | Ref<Element | Window>
+) => {
+  const element = unref(elementRef);
+
+  if (isWindow(element)) {
+    const width = element.innerWidth;
+    const height = element.innerHeight;
+
+    return {
+      top: 0,
+      left: 0,
+      right: width,
+      bottom: height,
+      width,
+      height,
+    };
+  }
+
+  if (element.getBoundingClientRect) {
+    return element.getBoundingClientRect();
+  }
+
+  return {
+    top: 0,
+    left: 0,
+    right: 0,
+    bottom: 0,
+    width: 0,
+    height: 0,
+  };
+};