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jeecgboot-vue3/src/components/jeecg/AiChat/hooks/useScroll.ts

@@ -0,0 +1,44 @@
+import type { Ref } from 'vue'
+import { nextTick, ref } from 'vue'
+
+type ScrollElement = HTMLDivElement | null
+
+interface ScrollReturn {
+  scrollRef: Ref<ScrollElement>
+  scrollToBottom: () => Promise<void>
+  scrollToTop: () => Promise<void>
+  scrollToBottomIfAtBottom: () => Promise<void>
+}
+
+export function useScroll(): ScrollReturn {
+  const scrollRef = ref<ScrollElement>(null)
+
+  const scrollToBottom = async () => {
+    await nextTick()
+    if (scrollRef.value)
+      scrollRef.value.scrollTop = scrollRef.value.scrollHeight
+  }
+
+  const scrollToTop = async () => {
+    await nextTick()
+    if (scrollRef.value)
+      scrollRef.value.scrollTop = 0
+  }
+
+  const scrollToBottomIfAtBottom = async () => {
+    await nextTick()
+    if (scrollRef.value) {
+      const threshold = 100 // Threshold, indicating the distance threshold to the bottom of the scroll bar.
+      const distanceToBottom = scrollRef.value.scrollHeight - scrollRef.value.scrollTop - scrollRef.value.clientHeight
+      if (distanceToBottom <= threshold)
+        scrollRef.value.scrollTop = scrollRef.value.scrollHeight
+    }
+  }
+
+  return {
+    scrollRef,
+    scrollToBottom,
+    scrollToTop,
+    scrollToBottomIfAtBottom,
+  }
+}