Ability to delete one of the scanned pages

app/src/main/java/org/mydomain/myscan/ImageRepository.kt

@@ -33,4 +33,9 @@ class ImageRepository(appFilesDir: File) {
         throw IllegalArgumentException("No image for id: $id")
     }
 
+    fun delete(id: String) {
+        val file = File(scanDir, id)
+        file.delete()
+        fileNames.remove(id)
+    }
 }

app/src/main/java/org/mydomain/myscan/MainViewModel.kt

@@ -116,6 +116,11 @@ class MainViewModel(
         _pageIds.value = imageRepository.imageIds()
     }
 
+    fun deletePage(id: String) {
+        imageRepository.delete(id)
+        _pageIds.value = imageRepository.imageIds()
+    }
+
     fun pageCount(): Int = pageIds.value.size
 
     fun getBitmap(id: String): Bitmap {

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

@@ -1,8 +1,10 @@
 package org.mydomain.myscan.view
 
 import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.PaddingValues
@@ -14,10 +16,12 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.Share
 import androidx.compose.material3.BottomAppBar
 import androidx.compose.material3.Button
@@ -35,7 +39,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
@@ -49,7 +52,6 @@ fun FinalizeDocumentScreen(
     onSavePressed: () -> Unit,
     onSharePressed: () -> Unit,
 ) {
-    val pageIds by viewModel.pageIds.collectAsStateWithLifecycle()
     Scaffold (
         topBar = {
             TopAppBar(
@@ -80,12 +82,21 @@ fun FinalizeDocumentScreen(
                 }
             }
         }
-    ) { padding ->
-        Column(modifier = Modifier
+    ) { padding -> DocumentPreview(padding, viewModel) }
+}
+
+@Composable
+private fun DocumentPreview(
+    padding: PaddingValues,
+    viewModel: MainViewModel
+) {
+    val pageIds by viewModel.pageIds.collectAsStateWithLifecycle()
+    Column(
+        modifier = Modifier
             .fillMaxSize()
             .verticalScroll(rememberScrollState())
-            .padding(padding)) {
-
+            .padding(padding)
+    ) {
         Text(
             "Pages",
             modifier = Modifier.padding(start = 16.dp, top = 16.dp),
@@ -100,16 +111,28 @@ fun FinalizeDocumentScreen(
         ) {
             pageIds.forEachIndexed { index, id ->
                 Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                    // TODO Display small images rather than big ones
+                    // TODO Make it possible to zoom on an image
+                    Box {
                         Image(
                             bitmap = viewModel.getBitmap(id).asImageBitmap(),
                             contentDescription = "Page ${index + 1}",
                             modifier = Modifier
                                 .size(160.dp)
+                                .padding(4.dp)
                                 .clip(RoundedCornerShape(8.dp))
-                                .border(1.dp, Color.DarkGray, RoundedCornerShape(8.dp)),
-                            contentScale = ContentScale.Fit
+                                .border(1.dp, Color.DarkGray)
                         )
-                        Text("Page ${index + 1}")
+
+                        IconButton(
+                            onClick = { viewModel.deletePage(id) },
+                            modifier = Modifier
+                                .align(Alignment.TopEnd)
+                                .size(24.dp)
+                                .background(Color.Black.copy(alpha = 0.5f), shape = CircleShape)
+                        ) {
+                            Icon(Icons.Default.Delete, contentDescription = "Delete", tint = Color.White)
+                        }
                     }
                 }
             }

app/src/test/java/org/mydomain/myscan/ImageRepositoryTest.kt

@@ -35,6 +35,18 @@ class ImageRepositoryTest {
         assertThat(repo.getContent(repo.imageIds()[0])).isEqualTo(bytes)
     }
 
+    @Test
+    fun delete_image() {
+        val repo = repo()
+        val bytes = byteArrayOf(101, 102, 103)
+        repo.add(bytes)
+        assertThat(repo.imageIds()).hasSize(1)
+        repo.delete(repo.imageIds()[0])
+        assertThat(repo.imageIds()).isEmpty()
+        val repo2 = repo()
+        assertThat(repo2.imageIds()).isEmpty()
+    }
+
     @Test
     fun `should find existing files at initialization`() {
         val bytes = byteArrayOf(101, 102, 103)