From 89f1df9a9bbe131798893cffe0ac642768b3d867 Mon Sep 17 00:00:00 2001
From: fengge <844143714@qq.com>
Date: Wed, 3 Jun 2026 14:48:56 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96(UI):=20=E4=BF=AE=E5=A4=8D=20?=
 =?UTF-8?q?Compose=20=E7=9A=84=E6=82=AC=E6=B5=AE=E7=AA=97=E7=81=BE?=
 =?UTF-8?q?=E9=9A=BE=E6=80=A7=E9=87=8D=E7=BB=84?=
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利用延迟读取(Deferred State Reading)的特性，将 fabOffsetX 等坐标变量的读取放置在 Modifier.offset 的 lambda 内部。
这样拖动悬浮窗时，只会触发 Compose 的布局阶段(Layout phase)刷新，而不再引发整个组件的无效重组(Recomposition)，彻底解决在低端机上拖动严重掉帧和 CPU 占用的问题。
---
 .../standapp/ui/chat/FloatingChatWidget.kt    | 20 +++++++------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt b/app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt
index 42585f5..84dcd91 100644
--- a/app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt
+++ b/app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt
@@ -94,25 +94,19 @@ fun FloatingChatWidget() {
                 visible = true
             }
 
-            // 👈 用 FAB 位置计算对话框位置，但强制钳制在屏幕内
-            // FAB右下角为基准：对话框应该出现在 FAB 附近
-            val fabRight = screenWidthPx - paddingPx * 2 + fabOffsetX  // FAB右边缘
-            val fabBottom = screenHeightPx - paddingPx * 2 - navBarPx + fabOffsetY  // FAB下边缘
-
-            // 对话框优先放在 FAB 左上方，如果放不下就贴边
-            val rawX = fabRight - cardWidthPx - paddingPx  // FAB左边
-            val rawY = fabBottom - cardHeightPx - paddingPx  // FAB上边
-
-            // 👈 关键：钳制到屏幕内
-            val clampedX = rawX.coerceIn(0f, screenWidthPx - cardWidthPx)
-            val clampedY = rawY.coerceIn(0f, screenHeightPx - cardHeightPx)
-
             AnimatedVisibility(
                 visible = visible,
                 enter = fadeIn(animationSpec = tween(300)) + scaleIn(initialScale = 0.8f, animationSpec = tween(300)),
                 exit = fadeOut(animationSpec = tween(200)) + scaleOut(targetScale = 0.8f, animationSpec = tween(200)),
                 modifier = Modifier
                     .offset {
+                        val fabRight = screenWidthPx - paddingPx * 2 + fabOffsetX
+                        val fabBottom = screenHeightPx - paddingPx * 2 - navBarPx + fabOffsetY
+                        val rawX = fabRight - cardWidthPx - paddingPx
+                        val rawY = fabBottom - cardHeightPx - paddingPx
+                        val clampedX = rawX.coerceIn(0f, screenWidthPx - cardWidthPx)
+                        val clampedY = rawY.coerceIn(0f, screenHeightPx - cardHeightPx)
+                        
                         IntOffset(
                             (clampedX + cardDragX).roundToInt()
                                 .coerceIn(0, (screenWidthPx - cardWidthPx).toInt()),