library: Optimize ListPopup performance

* No need to calculate position when not expanded

Author: YuKongA

example/src/commonMain/kotlin/SecondPage.kt

@@ -36,7 +36,7 @@ fun SecondPage(
 
     val dropdownOptions = listOf("Option 1", "Option 2", "Option 3", "Option 4")
     val dropdownSelectedOption = remember { mutableStateOf(0) }
-    var ii = remember { mutableStateOf(10) }
+    var ii = remember { mutableStateOf(8) }
 
     LaunchedEffect(pullToRefreshState.isRefreshing) {
         if (pullToRefreshState.isRefreshing) {
@@ -50,7 +50,7 @@ fun SecondPage(
 
     PullToRefresh(
         pullToRefreshState = pullToRefreshState,
-        onRefresh = { ii.value++ },
+        onRefresh = { ii.value += 4 },
         contentPadding = PaddingValues(top = padding.calculateTopPadding())
     ) {
         LazyColumn(

miuix/src/commonMain/kotlin/top/yukonga/miuix/kmp/basic/ListPopup.kt

@@ -74,6 +74,8 @@ fun ListPopup(
     minWidth: Dp = 200.dp,
     content: @Composable () -> Unit
 ) {
+    if (!show.value) return
+
     val currentOnDismissRequest by rememberUpdatedState(onDismissRequest)
     val currentContent by rememberUpdatedState(content)
 
@@ -159,7 +161,7 @@ fun ListPopup(
         enableWindowDim = enableWindowDim,
         transformOrigin = { rememberedTransformOrigin },
     ) {
-        val currentOffset by rememberUpdatedState(offset) // Used for placement
+        val currentOffset by rememberUpdatedState(offset)
         val shape: Shape = remember { SmoothRoundedCornerShape(16.dp) }
         val rememberedElevationPx = remember(density, shadowElevation) { with(density) { shadowElevation.toPx() } }
 
@@ -177,7 +179,7 @@ fun ListPopup(
             windowSize
         ) {
             popupModifier
-                .pointerInput(currentOnDismissRequest) { // Keyed by the updated state object
+                .pointerInput(currentOnDismissRequest) {
                     detectTapGestures {
                         currentOnDismissRequest?.invoke()
                     }