Links in message bubbles

app/src/main/java/net/buzzert/kordophonedroid/ui/conversationlist/ConversationListViewModel.kt

@@ -6,7 +6,10 @@ import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.cache
 import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.shareIn
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import net.buzzert.kordophone.backend.model.Conversation
@@ -29,6 +32,7 @@ class ConversationListViewModel @Inject constructor(
 ) : ViewModel() {
     val conversations: Flow<List<Conversation>>
         get() = chatRepository.conversationChanges
+            .shareIn(viewModelScope, started = SharingStarted.WhileSubscribed())
             .map {
                 it.sortedBy { it.date }
                     .reversed()

app/src/main/java/net/buzzert/kordophonedroid/ui/messagelist/MessageListScreen.kt

@@ -19,6 +19,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.ClickableText
 import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Scaffold
@@ -37,6 +38,7 @@ import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.tooling.preview.Preview
@@ -58,6 +60,8 @@ import net.buzzert.kordophonedroid.ui.Destination
 import net.buzzert.kordophonedroid.ui.LocalNavController
 import net.buzzert.kordophonedroid.ui.attachments.AttachmentFetchData
 import net.buzzert.kordophonedroid.ui.attachments.AttachmentViewModel
+import net.buzzert.kordophonedroid.ui.shared.LINK_ANNOTATION_TAG
+import net.buzzert.kordophonedroid.ui.shared.linkify
 import net.buzzert.kordophonedroid.ui.theme.KordophoneTopAppBar
 import okhttp3.HttpUrl
 import okhttp3.HttpUrl.Companion.toHttpUrl
@@ -317,16 +321,27 @@ fun MessageBubble(
 ) {
     val backgroundBubbleColor = if (mine) MaterialTheme.colors.primary else MaterialTheme.colors.secondary
 
+    // Linkify text
+    val annotatedString = text.linkify()
+    val urlHandler = LocalUriHandler.current
+
     BubbleScaffold(mine = mine, modifier = modifier) {
         Surface(
             color = backgroundBubbleColor,
             shape = if (mine) OutgoingChatBubbleShape else IncomingChatBubbleShape,
         ) {
-            Text(
-                text = text,
+            ClickableText(
+                text = annotatedString,
                 style = MaterialTheme.typography.body2,
                 modifier = Modifier
-                    .padding(12.dp)
+                    .padding(12.dp),
+                onClick = { index ->
+                    annotatedString
+                        .getStringAnnotations(LINK_ANNOTATION_TAG, index, index)
+                        .firstOrNull()?.let {
+                            urlHandler.openUri(it.item)
+                        }
+                }
             )
         }
     }

app/src/main/java/net/buzzert/kordophonedroid/ui/shared/StringUtils.kt

@@ -0,0 +1,33 @@
+package net.buzzert.kordophonedroid.ui.shared
+
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.style.TextDecoration
+
+const val LINK_ANNOTATION_TAG = "link"
+private val LINK_REGEX = "(https?)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]".toRegex()
+
+fun String.linkify(): AnnotatedString {
+    val text = this
+    val matches = LINK_REGEX.findAll(this)
+    return buildAnnotatedString {
+        append(text)
+
+        for (match in matches) {
+            val range = match.range.also {
+                // Make inclusive.
+                IntRange(it.first, it.last + 1)
+            }
+
+            // Annotate link
+            addStringAnnotation(LINK_ANNOTATION_TAG, match.value, range.first, range.last)
+
+            // Add style
+            addStyle(
+                style = SpanStyle(textDecoration = TextDecoration.Underline),
+                start = range.first, end = range.last
+            )
+        }
+    }
+}