feat: enhance emoji picker with swipe functionality and optimize category synchronization

app/src/main/java/com/rosetta/messenger/ui/components/OptimizedEmojiPicker.kt

@@ -10,9 +10,13 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.LazyGridState
 import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.foundation.lazy.grid.rememberLazyGridState
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.PagerState
+import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.*
@@ -74,8 +78,9 @@ fun OptimizedEmojiPicker(
 private class StableCallback(val onClick: (String) -> Unit)
 
 /**
- * Контент emoji picker'а - ОПТИМИЗИРОВАННЫЙ
+ * Контент emoji picker'а - ОПТИМИЗИРОВАННЫЙ + СВАЙПЫ
  */
+@OptIn(androidx.compose.foundation.ExperimentalFoundationApi::class)
 @Composable
 private fun EmojiPickerContent(
     isDarkTheme: Boolean,
@@ -84,10 +89,14 @@ private fun EmojiPickerContent(
     modifier: Modifier = Modifier
 ) {
     val context = LocalContext.current
-    var selectedCategory by remember { mutableStateOf(EMOJI_CATEGORIES[0]) }
-    val gridState = rememberLazyGridState()
     val scope = rememberCoroutineScope()
 
+    // 🔥 PagerState для свайпов между категориями
+    val pagerState = rememberPagerState(
+        initialPage = 0,
+        pageCount = { EMOJI_CATEGORIES.size }
+    )
+
     // 🔥 Wrap callback в stable class для избежания recomposition
     val stableCallback = remember(onEmojiSelected) { StableCallback(onEmojiSelected) }
 
@@ -98,24 +107,15 @@ private fun EmojiPickerContent(
         }
     }
 
-    // 🚀 derivedStateOf для минимизации recomposition
-    val displayedEmojis by remember(selectedCategory) {
-        derivedStateOf {
-            if (OptimizedEmojiCache.isLoaded) {
-                OptimizedEmojiCache.getEmojisForCategory(selectedCategory.key)
-            } else {
-                emptyList()
+    // 🔥 Callback для клика на категорию - плавная анимация к нужной странице
+    val onCategoryClicked: (Int) -> Unit = remember(scope) {
+        { index ->
+            scope.launch {
+                pagerState.animateScrollToPage(index)
             }
         }
     }
 
-    // 🚀 Scroll to top при смене категории - БЕЗ анимации для скорости
-    LaunchedEffect(selectedCategory) {
-        if (displayedEmojis.isNotEmpty()) {
-            gridState.scrollToItem(0) // 🔥 scrollToItem вместо animateScrollToItem
-        }
-    }
-
     // 🎨 Цвета темы - computed один раз
     val panelBackground = remember(isDarkTheme) {
         if (isDarkTheme) Color(0xFF1C1C1E) else Color(0xFFF2F2F7)
@@ -133,11 +133,11 @@ private fun EmojiPickerContent(
             .height(keyboardHeight)
             .background(panelBackground)
     ) {
-        // ============ КАТЕГОРИИ ============
+        // ============ КАТЕГОРИИ (синхронизированы с pager) ============
         CategoryBar(
             categories = EMOJI_CATEGORIES,
-            selectedCategory = selectedCategory,
-            onCategorySelected = { selectedCategory = it },
+            pagerState = pagerState,
+            onCategorySelected = onCategoryClicked,
             isDarkTheme = isDarkTheme,
             backgroundColor = categoryBarBackground
         )
@@ -150,30 +150,52 @@ private fun EmojiPickerContent(
             color = dividerColor
         )
 
-        // ============ СЕТКА ЭМОДЗИ ============
-        UltraOptimizedEmojiGrid(
-            isLoaded = OptimizedEmojiCache.isLoaded,
-            emojis = displayedEmojis,
-            gridState = gridState,
-            onEmojiSelected = stableCallback,
-            isDarkTheme = isDarkTheme
-        )
+        // ============ СВАЙПАБЕЛЬНЫЕ СТРАНИЦЫ ЭМОДЗИ ============
+        HorizontalPager(
+            state = pagerState,
+            modifier = Modifier.fillMaxSize(),
+            beyondBoundsPageCount = 1, // Предзагрузка соседних страниц для плавности
+            key = { EMOJI_CATEGORIES[it].key }
+        ) { pageIndex ->
+            val category = EMOJI_CATEGORIES[pageIndex]
+
+            // 🔥 Эмодзи для текущей страницы
+            val emojis = remember(category.key, OptimizedEmojiCache.isLoaded) {
+                if (OptimizedEmojiCache.isLoaded) {
+                    OptimizedEmojiCache.getEmojisForCategory(category.key)
+                } else {
+                    emptyList()
+                }
+            }
+
+            // 🔥 Каждая страница имеет свой gridState для сохранения позиции скролла
+            val pageGridState = rememberLazyGridState()
+
+            UltraOptimizedEmojiGrid(
+                isLoaded = OptimizedEmojiCache.isLoaded,
+                emojis = emojis,
+                gridState = pageGridState,
+                onEmojiSelected = stableCallback,
+                isDarkTheme = isDarkTheme
+            )
+        }
     }
 }
 
 /**
- * Горизонтальная полоса категорий - ОПТИМИЗИРОВАННАЯ
+ * Горизонтальная полоса категорий - синхронизирована с PagerState
  */
+@OptIn(androidx.compose.foundation.ExperimentalFoundationApi::class)
 @Composable
 private fun CategoryBar(
     categories: List<EmojiCategory>,
-    selectedCategory: EmojiCategory,
-    onCategorySelected: (EmojiCategory) -> Unit,
+    pagerState: PagerState,
+    onCategorySelected: (Int) -> Unit,
     isDarkTheme: Boolean,
     backgroundColor: Color
 ) {
-    // 🔥 Запоминаем interactionSource один раз для всего LazyRow
-    val interactionSource = remember { MutableInteractionSource() }
+    // 🔥 derivedStateOf для минимизации recomposition при свайпе
+    val currentPage by remember { derivedStateOf { pagerState.currentPage } }
 
     LazyRow(
         modifier = Modifier
@@ -188,11 +210,12 @@ private fun CategoryBar(
             items = categories,
             key = { it.key }
         ) { category ->
+            val index = categories.indexOf(category)
             // 🔥 Минимальная CategoryButton без анимаций
             SimpleCategoryButton(
                 category = category,
-                isSelected = selectedCategory == category,
-                onClick = { onCategorySelected(category) },
+                isSelected = currentPage == index,
+                onClick = { onCategorySelected(index) },
                 isDarkTheme = isDarkTheme
             )
         }

app/src/main/java/com/rosetta/messenger/ui/components/metaball/ProfileMetaballOverlay.kt

@@ -1,6 +1,7 @@
 package com.rosetta.messenger.ui.components.metaball
 
 import android.graphics.Path
+import android.graphics.RectF
 import android.util.Log
 import android.graphics.RenderEffect
 import android.graphics.RuntimeShader
@@ -18,6 +19,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.ui.graphics.RectangleShape
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
@@ -69,6 +71,12 @@ object ProfileMetaballConstants {
     val AVATAR_SIZE_EXPANDED = 120.dp
     val AVATAR_SIZE_MIN = 24.dp
     
+    // Standard ActionBar height (like Telegram's actionBar.getHeight())
+    val ACTION_BAR_HEIGHT = 56.dp
+    
+    // Offset from actionBar bottom to avatar center (Telegram: -dp(21))
+    val AVATAR_Y_OFFSET = 21.dp
+    
     // Telegram thresholds (in dp)
     val THRESHOLD_DRAWING = 40.dp   // isDrawing = vr <= 40dp
     val THRESHOLD_NEAR = 32.dp      // isNear = vr <= 32dp
@@ -229,10 +237,15 @@ private fun computeAvatarState(
     
     // ═══════════════════════════════════════════════════════════════
     // CENTER Y - Telegram: avatarY = lerp(endY, startY, diff)
+    // startY = statusBar + actionBarHeight + avatarRadius - dp(21)
     // endY = notch center (or -dp(29) if no notch)
-    // startY = statusBarHeight + actionBarHeight - dp(21) + some offset
+    // 
+    // Telegram формула: startY = statusBarHeight + actionBarHeight - dp(21) + avatarRadius
+    // Это помещает центр аватара на dp(21) НИЖЕ нижней границы actionBar
     // ═══════════════════════════════════════════════════════════════
-    val startY = statusBarHeightPx + (headerHeightPx - statusBarHeightPx) / 2f + 20f  // Normal center
+    val actionBarHeightPx = dp40 + dp18  // ~58dp, близко к стандартным 56dp
+    val avatarYOffset = dp22  // ~21dp offset ниже actionBar
+    val startY = statusBarHeightPx + actionBarHeightPx - avatarYOffset + (avatarSizeExpandedPx / 2f)
     val endY = notchCenterY  // Target = notch center
     
     val centerY: Float = when {
@@ -340,6 +353,9 @@ fun ProfileMetaballOverlay(
     val screenWidth = configuration.screenWidthDp.dp
     val density = LocalDensity.current
     
+    // Debug: log screen dimensions once
+    val TAG = "ProfileMetaball"
+    
     // Convert to pixels for path calculations
     val screenWidthPx = with(density) { screenWidth.toPx() }
     val statusBarHeightPx = with(density) { statusBarHeight.toPx() }
@@ -350,6 +366,12 @@ fun ProfileMetaballOverlay(
     // Get REAL camera/notch info from system (like Telegram does)
     val notchInfo = remember { NotchInfoUtils.getInfo(context) }
     
+    // Debug log notch info once
+    LaunchedEffect(notchInfo, screenWidthPx, statusBarHeightPx, headerHeightPx) {
+        Log.d(TAG, "NotchInfo: gravity=${notchInfo?.gravity}, isCircle=${notchInfo?.isLikelyCircle}, bounds=${notchInfo?.bounds}")
+        Log.d(TAG, "Screen: width=${screenWidthPx}px, statusBar=${statusBarHeightPx}px, header=${headerHeightPx}px")
+    }
+    
     // Calculate notch radius based on real device notch (like Telegram's ProfileGooeyView)
     val notchRadiusPx = remember(notchInfo) {
         if (notchInfo != null && notchInfo.gravity == Gravity.CENTER) {
@@ -366,9 +388,16 @@ fun ProfileMetaballOverlay(
         }
     }
     
-    // Notch center position
+    // Notch center position - ONLY use if notch is centered (like front camera)
+    // If notch is off-center (corner notch), use screen center instead
     val notchCenterX = remember(notchInfo, screenWidthPx) {
-        notchInfo?.bounds?.centerX() ?: (screenWidthPx / 2f)
+        if (notchInfo != null && notchInfo.gravity == Gravity.CENTER) {
+            // Centered notch (like Dynamic Island or punch-hole camera)
+            notchInfo.bounds.centerX()
+        } else {
+            // No notch or off-center notch - always use screen center
+            screenWidthPx / 2f
+        }
     }
     
     val notchCenterY = remember(notchInfo) {
@@ -424,6 +453,10 @@ fun ProfileMetaballOverlay(
     val c1 = remember { Point() } // Notch center
     val c2 = remember { Point() } // Avatar center
     
+    // 🔥 Reusable RectF like Telegram's AndroidUtilities.rectTmp
+    // Avoid creating new RectF objects every frame
+    val rectTmp = remember { RectF() }
+    
     // Calculate "v" parameter - thickness of connector based on distance
     // Like Telegram: v = clamp((1f - c / 1.3f) / 2f, 0.8f, 0)
     val distance = avatarState.centerY - notchCenterY
@@ -444,10 +477,12 @@ fun ProfileMetaballOverlay(
     // Show connector only when avatar is small enough (like Telegram isDrawing)
     // AND not when expanding (no metaball effect when expanded)
     // AND only when hasAvatar is true (no drop animation for placeholder)
-    val showConnector = hasAvatar && expansionProgress == 0f && avatarState.isDrawing && avatarState.showBlob && distance < maxDist * 1.5f
+    // AND only when device has real centered notch (Dynamic Island, punch-hole camera)
+    val hasRealNotch = notchInfo != null && notchInfo.gravity == Gravity.CENTER && notchInfo.bounds.width() > 0
+    val showConnector = hasRealNotch && hasAvatar && expansionProgress == 0f && avatarState.isDrawing && avatarState.showBlob && distance < maxDist * 1.5f
     
-    // Don't show black metaball shapes when expanded or when no avatar
-    val showMetaballLayer = hasAvatar && expansionProgress == 0f
+    // Don't show black metaball shapes when expanded or when no avatar or no real notch
+    val showMetaballLayer = hasRealNotch && hasAvatar && expansionProgress == 0f
     
     Box(modifier = modifier
         .fillMaxSize()
@@ -506,10 +541,10 @@ fun ProfileMetaballOverlay(
                                 screenWidthPx / 2f,
                                 statusBarHeightPx / 2f,
                                 notchRadiusPx,
-                            paint
-                        )
+                                paint
+                            )
+                        }
                     }
-                }
                 
                 // Draw avatar shape - circle or rounded rect depending on state
                 if (avatarState.showBlob) {
@@ -518,15 +553,16 @@ fun ProfileMetaballOverlay(
                     val r = avatarState.radius
                     val cornerR = avatarState.cornerRadius
                     
+                    // 🔥 Use rectTmp like Telegram's AndroidUtilities.rectTmp
                     // If cornerRadius is close to radius, draw circle; otherwise rounded rect
                     if (cornerR >= r * 0.95f) {
                         // Draw circle
                         nativeCanvas.drawCircle(cx, cy, r, paint)
                     } else {
                         // Draw rounded rect (like Telegram when isDrawing)
-                        android.graphics.RectF(cx - r, cy - r, cx + r, cy + r).let { rect ->
-                            nativeCanvas.drawRoundRect(rect, cornerR, cornerR, paint)
-                        }
+                        // Reuse rectTmp to avoid allocations
+                        rectTmp.set(cx - r, cy - r, cx + r, cy + r)
+                        nativeCanvas.drawRoundRect(rectTmp, cornerR, cornerR, paint)
                     }
                 }
                 
@@ -542,7 +578,7 @@ fun ProfileMetaballOverlay(
                     }
                 }
             }
-        }
+            }
         } // END if (showMetaballLayer)
         
         // ═══════════════════════════════════════════════════════════════