DocumentScreen: Landscape mode

app/src/main/java/org/mydomain/myscan/view/Buttons.kt

@@ -74,8 +74,8 @@ fun SecondaryActionButton(
 }
 
 @Composable
-fun BackButton(onClick: () -> Unit) {
+fun BackButton(onClick: () -> Unit, modifier: Modifier = Modifier) {
-    IconButton(onClick = onClick) {
+    IconButton(onClick = onClick, modifier = modifier) {
         Icon(
             Icons.AutoMirrored.Filled.ArrowBack,
             contentDescription = stringResource(R.string.back)

app/src/main/java/org/mydomain/myscan/view/CameraScreen.kt

@@ -29,29 +29,21 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
-import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.safeDrawing
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Article
-import androidx.compose.material3.BottomAppBar
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -193,37 +185,31 @@ private fun CameraScreenScaffold(
     thumbnailCoords: MutableState<Offset>,
     toAboutScreen: () -> Unit,
 ) {
-    val documentBar : @Composable () -> Unit = {
+    var tapCount by remember { mutableStateOf(0) }
-        DocumentBar(
+    var lastTapTime by remember { mutableStateOf(0L) }
-            pageListState = pageListState,
+    val tapThreshold = 500L
-            pageCount = cameraUiState.pageCount,
+    val onPageCountClick = {
-            onFinalizePressed = onFinalizePressed,
+        val currentTime = System.currentTimeMillis()
-            onDebugModeSwitched = onDebugModeSwitched,
+        if (currentTime - lastTapTime < tapThreshold) {
-            isLandscape = cameraUiState.isLandscape
+            tapCount++
-        )
+            if (tapCount >= 3) {
-    }
+                onDebugModeSwitched()
-    Box {
+                tapCount = 0
-        if (!cameraUiState.isLandscape) {
-            Scaffold(
-                bottomBar = documentBar
-            ) { padding ->
-                val modifier = Modifier.padding(bottom = padding.calculateBottomPadding()).fillMaxSize()
-                CameraPreviewBox(cameraPreview, cameraUiState, onCapture, modifier)
             }
         } else {
-            Scaffold { innerPadding ->
+            tapCount = 1
-                Row(
+        }
-                    modifier = Modifier.padding(innerPadding).fillMaxSize()
+        lastTapTime = currentTime
-                ) {
+    }
-                    CameraPreviewBox(cameraPreview, cameraUiState, onCapture, Modifier)
+
-                    documentBar()
+    Box {
-                }
+        MyScaffold(
-            }
+            toAboutScreen = toAboutScreen,
+            pageListState = pageListState,
+            bottomBar = { Bar(cameraUiState.pageCount, onPageCountClick, onFinalizePressed) }
+        ) {
+            modifier -> CameraPreviewBox(cameraPreview, cameraUiState, onCapture, modifier)
         }
-        AboutScreenNavButton(
-            onClick = toAboutScreen,
-            modifier = Modifier.align(Alignment.TopEnd).windowInsetsPadding(WindowInsets.safeDrawing)
-        )
         if (cameraUiState.captureState is CaptureState.CapturePreview) {
             CapturedImage(cameraUiState.captureState.processed.asImageBitmap(), thumbnailCoords)
         }
@@ -410,61 +396,6 @@ fun MessageBox(inferenceTime: Long) {
     )
 }
 
-@Composable
-fun DocumentBar(
-    pageListState:  CommonPageListState,
-    pageCount: Int,
-    onFinalizePressed: () -> Unit,
-    onDebugModeSwitched: () -> Unit,
-    isLandscape: Boolean,
-) {
-    var tapCount by remember { mutableStateOf(0) }
-    var lastTapTime by remember { mutableStateOf(0L) }
-    val tapThreshold = 500L
-    val onPageCountClick = {
-        val currentTime = System.currentTimeMillis()
-        if (currentTime - lastTapTime < tapThreshold) {
-            tapCount++
-            if (tapCount >= 3) {
-                onDebugModeSwitched()
-                tapCount = 0
-            }
-        } else {
-            tapCount = 1
-        }
-        lastTapTime = currentTime
-    }
-
-    Column (
-        horizontalAlignment = Alignment.CenterHorizontally,
-        modifier = Modifier.background(MaterialTheme.colorScheme.surfaceContainer)
-    ) {
-        CommonPageList(pageListState, Modifier.weight(1f))
-        BottomAppBar(
-            containerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
-        ) {
-            if (isLandscape) {
-                Column(
-                    horizontalAlignment = Alignment.CenterHorizontally,
-                    modifier = Modifier.fillMaxWidth()
-                ) {
-                    Bar(pageCount, onPageCountClick, onFinalizePressed)
-                }
-            } else {
-                Row(
-                    modifier = Modifier
-                        .padding(horizontal = 16.dp, vertical = 1.dp)
-                        .fillMaxWidth(),
-                    verticalAlignment = Alignment.CenterVertically,
-                    horizontalArrangement = Arrangement.SpaceBetween
-                ) {
-                    Bar(pageCount, onPageCountClick, onFinalizePressed)
-                }
-            }
-        }
-    }
-}
-
 @Composable
 private fun Bar(
     pageCount: Int,
@@ -479,7 +410,7 @@ private fun Bar(
     MainActionButton(
         onClick = onFinalizePressed,
         enabled = pageCount > 0,
-        text = "Document",
+        text = stringResource(R.string.document),
         icon = Icons.AutoMirrored.Filled.Article,
     )
 }

app/src/main/java/org/mydomain/myscan/view/DocumentScreen.kt

@@ -22,7 +22,6 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
@@ -40,11 +39,8 @@ import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.BottomAppBar
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.MutableIntState
@@ -95,28 +91,29 @@ fun DocumentScreen(
     BackHandler {
         navigation.back()
     }
-    Scaffold (
+
-        topBar = {
+    MyScaffold(
-            TopAppBar(
+        toAboutScreen = navigation.toAboutScreen,
-                colors = TopAppBarDefaults.topAppBarColors(
+        pageListState = CommonPageListState(
-                    containerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
+            pageIds,
-                    titleContentColor = MaterialTheme.colorScheme.onSurface,
+            imageLoader,
-                ),
+            onPageClick = { index -> currentPageIndex.intValue = index },
-                title = { Text(stringResource(R.string.document)) },
+            currentPageIndex = currentPageIndex.intValue,
-                navigationIcon = { BackButton(navigation.back) },
+            listState = rememberLazyListState(),
-                actions = {
+        ),
-                    AboutScreenNavButton(onClick = navigation.toAboutScreen)
+        onBack = navigation.back,
-                }
+        bottomBar = {
+            BottomBar(showPdfDialog, showNewDocDialog)
+        },
+        pageListButton = {
+            SecondaryActionButton(
+                icon = Icons.Default.Add,
+                onClick = navigation.toCameraScreen,
+                contentDescription = stringResource(R.string.add_page),
             )
         },
-        bottomBar = {
+    ) { modifier ->
-            Column {
+        DocumentPreview(pageIds, imageLoader, currentPageIndex, onDeleteImage, modifier)
-                PageList(pageIds, imageLoader, currentPageIndex, navigation.toCameraScreen)
-                BottomBar(showPdfDialog, showNewDocDialog)
-            }
-        }
-    ) { padding ->
-        DocumentPreview(pageIds, imageLoader, currentPageIndex, onDeleteImage, padding)
         if (showNewDocDialog.value) {
             NewDocumentDialog(onConfirm = onStartNew, showNewDocDialog)
         }
@@ -135,14 +132,12 @@ private fun DocumentPreview(
     imageLoader: (String) -> Bitmap?,
     currentPageIndex: MutableIntState,
     onDeleteImage: (String) -> Unit,
-    padding: PaddingValues,
+    modifier: Modifier,
 ) {
     val imageId = pageIds[currentPageIndex.intValue]
     Column (
-        modifier = Modifier
+        modifier = modifier
-            .fillMaxSize()
             .background(MaterialTheme.colorScheme.surfaceContainerLow)
-            .padding(padding)
     ) {
         Box (
             modifier = Modifier.fillMaxSize()
@@ -175,13 +170,13 @@ private fun DocumentPreview(
                 contentDescription = stringResource(R.string.delete_page),
                 onClick = { onDeleteImage(imageId) },
                 modifier = Modifier
-                    .align(Alignment.TopEnd)
+                    .align(Alignment.BottomEnd)
                     .padding(8.dp)
             )
             Text("${currentPageIndex.intValue + 1} / ${pageIds.size}",
                 color = MaterialTheme.colorScheme.inverseOnSurface,
                 modifier = Modifier
-                    .align(Alignment.TopStart)
+                    .align(Alignment.BottomStart)
                     .padding(all = 16.dp)
                     .background(
                         color = MaterialTheme.colorScheme.inverseSurface.copy(alpha = 0.5f),
@@ -193,34 +188,6 @@ private fun DocumentPreview(
     }
 }
 
-@Composable
-private fun PageList(
-    pageIds: List<String>,
-    imageLoader: (String) -> Bitmap?,
-    currentPageIndex: MutableState<Int>,
-    toCameraScreen: () -> Unit
-) {
-    Box {
-        CommonPageList(
-            CommonPageListState(
-                pageIds,
-                imageLoader,
-                onPageClick = { index -> currentPageIndex.value = index },
-                currentPageIndex = currentPageIndex.value,
-                listState = rememberLazyListState()
-            )
-        )
-        SecondaryActionButton(
-            icon = Icons.Default.Add,
-            onClick = toCameraScreen,
-            contentDescription = stringResource(R.string.add_page),
-            modifier = Modifier
-                .align(Alignment.CenterEnd)
-                .padding(8.dp)
-        )
-    }
-}
-
 @Composable
 private fun BottomBar(
     showPdfDialog: MutableState<Boolean>,
@@ -296,3 +263,10 @@ fun DocumentScreenPreview() {
         )
     }
 }
+
+@Preview(showBackground = true, widthDp = 640, heightDp = 320)
+@Composable
+fun DocumentScreenPreviewInLandscapeMode() {
+    DocumentScreenPreview()
+}
+

app/src/main/java/org/mydomain/myscan/view/PageList.kt

@@ -67,6 +67,7 @@ fun CommonPageList(
     val isLandscape = LocalConfiguration.current.orientation == Configuration.ORIENTATION_LANDSCAPE
     if (isLandscape) {
         LazyColumn (
+            horizontalAlignment = Alignment.CenterHorizontally,
             modifier = modifier
         ) {
             itemsIndexed(state.pageIds) { index, id ->

app/src/main/java/org/mydomain/myscan/view/Scaffold.kt

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.mydomain.myscan.view
+
+import android.content.res.Configuration
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.windowInsetsPadding
+import androidx.compose.material3.BottomAppBar
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun MyScaffold(
+    toAboutScreen: () -> Unit,
+    pageListState: CommonPageListState,
+    pageListButton: (@Composable () -> Unit)? = null,
+    bottomBar: @Composable () -> Unit,
+    onBack: (() -> Unit)? = null,
+    content: @Composable (Modifier) -> Unit,
+) {
+    Box {
+        if (!isLandscape(LocalConfiguration.current)) {
+            Scaffold(
+                bottomBar = { DocumentBar(pageListState, bottomBar, Modifier, pageListButton) }
+            ) { innerPadding ->
+                content(Modifier.padding(innerPadding).fillMaxSize())
+            }
+        } else {
+            Scaffold { innerPadding ->
+                Row(
+                    modifier = Modifier.padding(innerPadding).fillMaxSize()
+                ) {
+                    content(Modifier.weight(2f))
+                    DocumentBar(pageListState, bottomBar, Modifier.weight(1f), pageListButton)
+                }
+            }
+        }
+        if (onBack != null) {
+            BackButton(
+                onBack,
+                modifier = Modifier.align(Alignment.TopStart).windowInsetsPadding(WindowInsets.safeDrawing)
+            )
+        }
+        AboutScreenNavButton(
+            onClick = toAboutScreen,
+            modifier = Modifier.align(Alignment.TopEnd).windowInsetsPadding(WindowInsets.safeDrawing)
+        )
+    }
+}
+
+@Composable
+fun DocumentBar(
+    pageListState:  CommonPageListState,
+    buttonBar: @Composable () -> Unit,
+    modifier: Modifier = Modifier,
+    pageListButton: (@Composable () -> Unit)? = null,
+) {
+    Column (
+        horizontalAlignment = Alignment.CenterHorizontally,
+        modifier = modifier.background(MaterialTheme.colorScheme.surfaceContainer)
+    ) {
+        var modifier: Modifier = Modifier
+        if (isLandscape(LocalConfiguration.current)) {
+            modifier = modifier.weight(1f).fillMaxWidth()
+        }
+        Box (modifier) {
+            CommonPageList(pageListState, modifier = Modifier.fillMaxWidth())
+
+            if (pageListButton != null) {
+                Box (Modifier
+                    .align(Alignment.BottomEnd)
+                    .padding(horizontal = 8.dp, vertical = 16.dp)
+                ) {
+                    pageListButton()
+                }
+            }
+        }
+
+        BottomAppBar(
+            containerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
+        ) {
+            if (isLandscape(LocalConfiguration.current)) {
+                Column(
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    buttonBar()
+                }
+            } else {
+                Row(
+                    modifier = Modifier
+                        .padding(horizontal = 16.dp, vertical = 1.dp)
+                        .fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    buttonBar()
+                }
+            }
+        }
+    }
+}
+
+fun isLandscape(configuration: Configuration): Boolean {
+    return configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
+}