feat: language fragment to jetpack compose

- added orders to the test rule to avoid retries error in tests.
- renamed content lambda to "navigationIcon".
- removed redundant "Experimental api" from kiwixSearchView.
- added appropriate text size for kiwixSearchView.

app/src/main/java/org/kiwix/kiwixmobile/language/LanguageScreen.kt

@@ -27,6 +27,7 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
@@ -47,6 +48,7 @@ import org.kiwix.kiwixmobile.language.viewmodel.LanguageViewModel
 import org.kiwix.kiwixmobile.language.viewmodel.State
 import org.kiwix.kiwixmobile.language.viewmodel.State.Content
 
+@OptIn(ExperimentalMaterial3Api::class)
 @SuppressLint("ComposableLambdaParameterNaming")
 @Composable
 fun LanguageScreen(
@@ -68,13 +70,13 @@ fun LanguageScreen(
       navigationIcon = navigationIcon,
       actionMenuItems = actionMenuItemList,
       searchBar = if (isSearchActive) {
-        { modifier ->
+        {
           KiwixSearchView(
-            modifier = modifier,
             value = searchText,
             testTag = SEARCH_FIELD_TESTING_TAG,
             onValueChange = onAppBarValueChange,
-            onClearClick = onClearClick
+            onClearClick = onClearClick,
+            modifier = Modifier
           )
         }
       } else {

core/src/main/java/org/kiwix/kiwixmobile/core/ui/components/ContentLoadingProgressBar.kt

@@ -42,21 +42,11 @@ fun ContentLoadingProgressBar(
 ) {
   when (progressBarStyle) {
     ProgressBarStyle.CIRCLE -> {
-      if (progress == ZERO) {
-        // Indeterminate mode - will spin continuously
-        CircularProgressIndicator(
-          modifier = modifier,
-          color = progressBarColor
-        )
-      } else {
-        // Determinate mode - shows specific progress
-        CircularProgressIndicator(
-          modifier = modifier,
-          progress = { progress.toFloat() / HUNDERED },
-          color = progressBarColor,
-          trackColor = progressBarTrackColor
-        )
-      }
+      CircularProgressIndicator(
+        modifier = modifier,
+        color = progressBarColor,
+        trackColor = progressBarTrackColor
+      )
     }
 
     ProgressBarStyle.HORIZONTAL -> {

core/src/main/java/org/kiwix/kiwixmobile/core/ui/components/KiwixAppBar.kt

@@ -19,64 +19,86 @@
 package org.kiwix.kiwixmobile.core.ui.components
 
 import androidx.annotation.StringRes
-import androidx.compose.foundation.background
 import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.TopAppBarScrollBehavior
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.platform.testTag
-import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight.Companion.SemiBold
+import androidx.compose.ui.text.style.TextOverflow
+import org.kiwix.kiwixmobile.core.downloader.downloadManager.ZERO
 import org.kiwix.kiwixmobile.core.ui.models.ActionMenuItem
-import org.kiwix.kiwixmobile.core.ui.models.IconItem
+import org.kiwix.kiwixmobile.core.ui.models.toPainter
 import org.kiwix.kiwixmobile.core.ui.theme.Black
 import org.kiwix.kiwixmobile.core.ui.theme.KiwixTheme
 import org.kiwix.kiwixmobile.core.ui.theme.MineShaftGray350
 import org.kiwix.kiwixmobile.core.ui.theme.White
-import org.kiwix.kiwixmobile.core.utils.ComposeDimens.KIWIX_APP_BAR_HEIGHT
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.SIXTEEN_DP
 
 const val TOOLBAR_TITLE_TESTING_TAG = "toolbarTitle"
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun KiwixAppBar(
   @StringRes titleId: Int,
   navigationIcon: @Composable () -> Unit,
   actionMenuItems: List<ActionMenuItem> = emptyList(),
+  topAppBarScrollBehavior: TopAppBarScrollBehavior = TopAppBarDefaults.pinnedScrollBehavior(),
   // Optional search bar, used in fragments that require it
-  searchBar: (@Composable (Modifier) -> Unit)? = null
+  searchBar: (@Composable () -> Unit)? = null
 ) {
   KiwixTheme {
-    Row(
-      modifier = Modifier
-        .fillMaxWidth()
-        .height(KIWIX_APP_BAR_HEIGHT)
-        .background(color = Black),
-      verticalAlignment = Alignment.CenterVertically
-    ) {
-      navigationIcon()
-      searchBar?.let { searchBarComposable ->
-        searchBarComposable(
-          Modifier.weight(1f)
-        )
-      } ?: run {
-        // Otherwise, show the title
-        AppBarTitle(titleId)
-        Spacer(Modifier.weight(1f))
-      }
-      ActionMenu(actionMenuItems)
+    TopAppBar(
+      title = { AppBarTitleSection(titleId, searchBar) },
+      navigationIcon = navigationIcon,
+      actions = { ActionMenu(actionMenuItems) },
+      scrollBehavior = topAppBarScrollBehavior,
+      colors = TopAppBarDefaults.topAppBarColors(
+        containerColor = Black,
+        scrolledContainerColor = Black
+      )
+    )
+  }
+}
+
+@Suppress("ComposableLambdaParameterNaming")
+@Composable
+private fun AppBarTitleSection(
+  @StringRes titleId: Int,
+  searchBar: (@Composable () -> Unit)? = null
+) {
+  Box(
+    modifier = Modifier
+      .fillMaxSize()
+      .padding(start = SIXTEEN_DP),
+    contentAlignment = Alignment.CenterStart
+  ) {
+    searchBar?.let {
+      it()
+    } ?: run {
+      AppBarTitle(titleId)
     }
   }
 }
@@ -93,10 +115,11 @@ private fun AppBarTitle(
   Text(
     text = stringResource(titleId),
     color = appBarTitleColor,
-    style = MaterialTheme.typography.titleLarge.copy(fontWeight = SemiBold),
+    style = MaterialTheme.typography.titleMedium,
+    overflow = TextOverflow.Ellipsis,
+    maxLines = 1,
     modifier = Modifier
-      .padding(horizontal = SIXTEEN_DP)
-      .testTag(TOOLBAR_TITLE_TESTING_TAG)
+      .testTag(TOOLBAR_TITLE_TESTING_TAG),
   )
 }
 
@@ -107,14 +130,10 @@ private fun ActionMenu(actionMenuItems: List<ActionMenuItem>) {
       IconButton(
         enabled = menuItem.isEnabled,
         onClick = menuItem.onClick,
-        modifier = Modifier
-          .testTag(menuItem.testingTag)
+        modifier = Modifier.testTag(menuItem.testingTag)
       ) {
         Icon(
-          painter = when (val icon = menuItem.icon) {
-            is IconItem.Vector -> rememberVectorPainter(icon.imageVector)
-            is IconItem.Drawable -> painterResource(icon.drawableRes)
-          },
+          painter = menuItem.icon.toPainter(),
           contentDescription = stringResource(menuItem.contentDescription),
           tint = if (menuItem.isEnabled) menuItem.iconTint else Color.Gray
         )
@@ -122,3 +141,23 @@ private fun ActionMenu(actionMenuItems: List<ActionMenuItem>) {
     }
   }
 }
+
+@Composable
+fun rememberBottomNavigationVisibility(lazyListState: LazyListState?): Boolean {
+  var isToolbarVisible by remember { mutableStateOf(true) }
+  var lastScrollIndex by remember { mutableIntStateOf(ZERO) }
+  val updatedLazyListState = rememberUpdatedState(lazyListState)
+
+  LaunchedEffect(updatedLazyListState) {
+    updatedLazyListState.value?.let { state ->
+      snapshotFlow { state.firstVisibleItemIndex }
+        .collect { newScrollIndex ->
+          if (newScrollIndex != lastScrollIndex) {
+            isToolbarVisible = newScrollIndex < lastScrollIndex
+            lastScrollIndex = newScrollIndex
+          }
+        }
+    }
+  }
+  return isToolbarVisible
+}