Adds an Image Carousel when there are more than 1 image in the post.

app/build.gradle

@@ -104,6 +104,8 @@ dependencies {
     implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"
     implementation "androidx.lifecycle:lifecycle-livedata:$lifecycle_version"
 
+    implementation "net.engawapg.lib:zoomable:1.4.0"
+
     // Biometrics
     implementation "androidx.biometric:biometric-ktx:1.2.0-alpha05"
 

app/src/main/java/com/vitorpamplona/amethyst/ui/components/RichTextViewer.kt

@@ -131,6 +131,20 @@ fun RichTextViewer(
                 )
             }
         } else {
+            val imagesForPager = mutableListOf<String>()
+
+            content.split('\n').forEach { paragraph ->
+                paragraph.split(' ').forEach { word: String ->
+                    // sequence of images will render in a slideview
+                    if (isValidURL(word)) {
+                        val removedParamsFromUrl = word.split("?")[0].lowercase()
+                        if (imageExtension.matcher(removedParamsFromUrl).matches()) {
+                            imagesForPager.add(word)
+                        }
+                    }
+                }
+            }
+
             // FlowRow doesn't work well with paragraphs. So we need to split them
             content.split('\n').forEach { paragraph ->
                 FlowRow() {
@@ -140,17 +154,18 @@ fun RichTextViewer(
                             // Explicit URL
                             val lnInvoice = LnInvoiceUtil.findInvoice(word)
                             val lnWithdrawal = LnWithdrawalUtil.findWithdrawal(word)
-                            if (lnInvoice != null) {
-                                InvoicePreview(lnInvoice)
-                            } else if (isValidURL(word)) {
+
+                            if (isValidURL(word)) {
                                 val removedParamsFromUrl = word.split("?")[0].lowercase()
                                 if (imageExtension.matcher(removedParamsFromUrl).matches()) {
-                                    ZoomableImageView(word)
+                                    ZoomableImageView(word, imagesForPager)
                                 } else if (videoExtension.matcher(removedParamsFromUrl).matches()) {
                                     VideoView(word)
                                 } else {
                                     UrlPreview(word, "$word ")
                                 }
+                            } else if (lnInvoice != null) {
+                                InvoicePreview(lnInvoice)
                             } else if (lnWithdrawal != null) {
                                 ClickableWithdrawal(withdrawalString = lnWithdrawal)
                             } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {

app/src/main/java/com/vitorpamplona/amethyst/ui/components/SlidingCarousel.kt

@@ -0,0 +1,104 @@
+package com.vitorpamplona.amethyst.ui.components
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.interaction.collectIsDraggedAsState
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.wrapContentHeight
+import androidx.compose.foundation.layout.wrapContentWidth
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Surface
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import com.google.accompanist.pager.ExperimentalPagerApi
+import com.google.accompanist.pager.HorizontalPager
+import com.google.accompanist.pager.PagerState
+
+@OptIn(ExperimentalPagerApi::class)
+@Composable
+fun SlidingCarousel(
+    modifier: Modifier = Modifier,
+    pagerState: PagerState = remember { PagerState() },
+    itemsCount: Int,
+    itemContent: @Composable (index: Int) -> Unit
+) {
+    val isDragged by pagerState.interactionSource.collectIsDraggedAsState()
+
+    Box(
+        modifier = modifier.fillMaxWidth()
+    ) {
+        HorizontalPager(count = itemsCount, state = pagerState) { page ->
+            itemContent(page)
+        }
+
+        // you can remove the surface in case you don't want
+        // the transparant bacground
+        Surface(
+            modifier = Modifier
+                .padding(bottom = 8.dp)
+                .align(Alignment.BottomCenter),
+            shape = CircleShape,
+            color = Color.Black.copy(alpha = 0.5f)
+        ) {
+            DotsIndicator(
+                modifier = Modifier.padding(horizontal = 8.dp, vertical = 6.dp),
+                totalDots = itemsCount,
+                selectedIndex = if (isDragged) pagerState.currentPage else pagerState.targetPage,
+                dotSize = 8.dp
+            )
+        }
+    }
+}
+
+@Composable
+fun DotsIndicator(
+    modifier: Modifier = Modifier,
+    totalDots: Int,
+    selectedIndex: Int,
+    selectedColor: Color = MaterialTheme.colors.primary /* Color.Yellow */,
+    unSelectedColor: Color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f) /* Color.Gray */,
+    dotSize: Dp
+) {
+    LazyRow(
+        modifier = modifier
+            .wrapContentWidth()
+            .wrapContentHeight()
+    ) {
+        items(totalDots) { index ->
+            IndicatorDot(
+                color = if (index == selectedIndex) selectedColor else unSelectedColor,
+                size = dotSize
+            )
+
+            if (index != totalDots - 1) {
+                Spacer(modifier = Modifier.padding(horizontal = 2.dp))
+            }
+        }
+    }
+}
+
+@Composable
+fun IndicatorDot(
+    modifier: Modifier = Modifier,
+    size: Dp,
+    color: Color
+) {
+    Box(
+        modifier = modifier
+            .size(size)
+            .clip(CircleShape)
+            .background(color)
+    )
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/components/ZoomableAsyncImage.kt

@@ -1,61 +0,0 @@
-package com.vitorpamplona.amethyst.ui.components
-
-import androidx.compose.foundation.gestures.awaitEachGesture
-import androidx.compose.foundation.gestures.awaitFirstDown
-import androidx.compose.foundation.gestures.calculatePan
-import androidx.compose.foundation.gestures.calculateZoom
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.input.pointer.pointerInput
-import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.res.stringResource
-import coil.compose.AsyncImage
-import com.vitorpamplona.amethyst.R
-
-@Composable
-fun ZoomableAsyncImage(imageUrl: String) {
-    var scale by remember { mutableStateOf(1f) }
-    var offsetX by remember { mutableStateOf(0f) }
-    var offsetY by remember { mutableStateOf(0f) }
-
-    Column(
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally,
-        modifier = Modifier
-            .pointerInput(Unit) {
-                awaitEachGesture {
-                    awaitFirstDown()
-                    do {
-                        val event = awaitPointerEvent()
-                        scale *= event.calculateZoom()
-                        val offset = event.calculatePan()
-                        offsetX += offset.x
-                        offsetY += offset.y
-                    } while (event.changes.any { it.pressed })
-                }
-            }
-    ) {
-        AsyncImage(
-            model = imageUrl,
-            contentDescription = stringResource(id = R.string.profile_image),
-            contentScale = ContentScale.FillWidth,
-            modifier = Modifier
-                .fillMaxSize()
-                .graphicsLayer(
-                    scaleX = scale,
-                    scaleY = scale,
-                    translationX = offsetX,
-                    translationY = offsetY
-                )
-        )
-    }
-}

app/src/main/java/com/vitorpamplona/amethyst/ui/components/ZoomableImageView.kt

@@ -18,22 +18,27 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
-import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
 import coil.compose.AsyncImage
+import com.google.accompanist.pager.ExperimentalPagerApi
+import com.google.accompanist.pager.PagerState
+import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.actions.CloseButton
 import com.vitorpamplona.amethyst.ui.actions.SaveToGallery
+import net.engawapg.lib.zoomable.rememberZoomState
+import net.engawapg.lib.zoomable.zoomable
 
 @Composable
-@OptIn(ExperimentalComposeUiApi::class, ExperimentalFoundationApi::class)
-fun ZoomableImageView(word: String) {
+@OptIn(ExperimentalFoundationApi::class)
+fun ZoomableImageView(word: String, images: List<String> = listOf(word)) {
     val clipboardManager = LocalClipboardManager.current
 
     // store the dialog open or close state
@@ -49,7 +54,11 @@ fun ZoomableImageView(word: String) {
             .padding(top = 4.dp)
             .fillMaxWidth()
             .clip(shape = RoundedCornerShape(15.dp))
-            .border(1.dp, MaterialTheme.colors.onSurface.copy(alpha = 0.12f), RoundedCornerShape(15.dp))
+            .border(
+                1.dp,
+                MaterialTheme.colors.onSurface.copy(alpha = 0.12f),
+                RoundedCornerShape(15.dp)
+            )
             .combinedClickable(
                 onClick = { dialogOpen = true },
                 onLongClick = { clipboardManager.setText(AnnotatedString(word)) }
@@ -57,12 +66,13 @@ fun ZoomableImageView(word: String) {
     )
 
     if (dialogOpen) {
-        ZoomableImageDialog(word, onDismiss = { dialogOpen = false })
+        ZoomableImageDialog(word, images, onDismiss = { dialogOpen = false })
     }
 }
 
+@OptIn(ExperimentalPagerApi::class)
 @Composable
-fun ZoomableImageDialog(imageUrl: String, onDismiss: () -> Unit) {
+fun ZoomableImageDialog(imageUrl: String, allImages: List<String> = listOf(imageUrl), onDismiss: () -> Unit) {
     Dialog(
         onDismissRequest = onDismiss,
         properties = DialogProperties(usePlatformDefaultWidth = false)
@@ -71,6 +81,8 @@ fun ZoomableImageDialog(imageUrl: String, onDismiss: () -> Unit) {
             Column(
                 modifier = Modifier.padding(10.dp)
             ) {
+                var pagerState: PagerState = remember { PagerState() }
+
                 Row(
                     modifier = Modifier
                         .fillMaxWidth(),
@@ -79,10 +91,34 @@ fun ZoomableImageDialog(imageUrl: String, onDismiss: () -> Unit) {
                 ) {
                     CloseButton(onCancel = onDismiss)
 
-                    SaveToGallery(url = imageUrl)
+                    SaveToGallery(url = allImages[pagerState.currentPage])
                 }
 
-                ZoomableAsyncImage(imageUrl)
+                if (allImages.size > 1) {
+                    SlidingCarousel(
+                        pagerState = pagerState,
+                        itemsCount = allImages.size,
+                        itemContent = { index ->
+                            AsyncImage(
+                                model = allImages[index],
+                                contentDescription = stringResource(id = R.string.profile_image),
+                                contentScale = ContentScale.FillWidth,
+                                modifier = Modifier
+                                    .fillMaxSize()
+                                    .zoomable(rememberZoomState())
+                            )
+                        }
+                    )
+                } else {
+                    AsyncImage(
+                        model = imageUrl,
+                        contentDescription = stringResource(id = R.string.profile_image),
+                        contentScale = ContentScale.FillWidth,
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .zoomable(rememberZoomState())
+                    )
+                }
             }
         }
     }

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HomeConversationsFeedFilter.kt

@@ -3,7 +3,6 @@ package com.vitorpamplona.amethyst.ui.dal
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
-import com.vitorpamplona.amethyst.service.model.RepostEvent
 import com.vitorpamplona.amethyst.service.model.TextNoteEvent
 
 object HomeConversationsFeedFilter : FeedFilter<Note>() {