Add TransferProgressIndicator composable.

Adds a composable version of `TransferProgressView`.

app/src/main/java/org/thoughtcrime/securesms/components/transfercontrols/TransferProgressIndicator.kt

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2025 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.components.transfercontrols
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.StrokeCap
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.semantics.clearAndSetSemantics
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.unit.dp
+import org.signal.core.ui.compose.clickableContainer
+import org.thoughtcrime.securesms.R
+
+/**
+ * A button that can be used to start, cancel, show progress, and show completion of a data transfer.
+ */
+@Composable
+fun TransferProgressIndicator(
+  state: TransferProgressState,
+  modifier: Modifier = Modifier.size(48.dp)
+) {
+  when (state) {
+    is TransferProgressState.Ready -> StartTransferButton(state, modifier)
+    is TransferProgressState.InProgress -> ProgressIndicator(state, modifier)
+    is TransferProgressState.Complete -> CompleteIcon(state, modifier)
+  }
+}
+
+@Composable
+private fun StartTransferButton(
+  state: TransferProgressState.Ready,
+  modifier: Modifier = Modifier
+) {
+  Box(
+    modifier = modifier
+      .clickableContainer(
+        contentDescription = state.startButtonContentDesc,
+        onClickLabel = state.startButtonOnClickLabel,
+        onClick = state.onStartClick
+      )
+  ) {
+    Icon(
+      painter = state.iconPainter,
+      tint = MaterialTheme.colorScheme.onSurface,
+      contentDescription = null,
+      modifier = Modifier
+        .matchParentSize()
+        .padding(12.dp)
+    )
+  }
+}
+
+@Composable
+private fun ProgressIndicator(
+  state: TransferProgressState.InProgress,
+  modifier: Modifier = Modifier
+) {
+  Box(
+    modifier = modifier
+      .clickableContainer(
+        contentDescription = null,
+        onClickLabel = state.cancelButtonOnClickLabel,
+        onClick = state.onCancelClick
+      )
+      .padding(8.dp)
+  ) {
+    Icon(
+      painter = painterResource(R.drawable.symbol_stop_24),
+      tint = MaterialTheme.colorScheme.onSurface,
+      contentDescription = null,
+      modifier = Modifier
+        .matchParentSize()
+        .padding(6.dp)
+    )
+
+    CircularProgressIndicator(
+      progress = { state.progress },
+      strokeWidth = 2.dp,
+      strokeCap = StrokeCap.Round,
+      trackColor = MaterialTheme.colorScheme.surfaceContainerHighest,
+      color = MaterialTheme.colorScheme.onSurface,
+      modifier = Modifier
+        .matchParentSize()
+        .clearAndSetSemantics {
+          contentDescription = state.cancelButtonContentDesc
+        }
+    )
+  }
+}
+
+@Composable
+private fun CompleteIcon(
+  state: TransferProgressState.Complete,
+  modifier: Modifier = Modifier
+) {
+  Icon(
+    painter = state.iconPainter,
+    tint = MaterialTheme.colorScheme.onSurface,
+    contentDescription = state.iconContentDesc,
+    modifier = modifier.padding(12.dp)
+  )
+}
+
+sealed interface TransferProgressState {
+  data class Ready(
+    val iconPainter: Painter,
+    val startButtonContentDesc: String,
+    val startButtonOnClickLabel: String,
+    val onStartClick: () -> Unit
+  ) : TransferProgressState
+
+  data class InProgress(
+    val progress: Float,
+    val cancelButtonContentDesc: String,
+    val cancelButtonOnClickLabel: String,
+    val onCancelClick: () -> Unit = {}
+  ) : TransferProgressState
+
+  data class Complete(
+    val iconPainter: Painter,
+    val iconContentDesc: String
+  ) : TransferProgressState
+}

app/src/main/java/org/thoughtcrime/securesms/components/transfercontrols/TransferProgressView.kt

@@ -15,6 +15,7 @@ import android.graphics.RectF
 import android.graphics.drawable.Drawable
 import android.util.AttributeSet
 import android.view.View
+import androidx.annotation.Discouraged
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.withTranslation
 import org.signal.core.util.logging.Log
@@ -24,6 +25,7 @@ import kotlin.math.roundToInt
 /**
  * This displays a circular progress around an icon. The icon is either an upload arrow, a download arrow, or a rectangular stop button.
  */
+@Discouraged("Use TransferProgressIndicator instead.")
 class TransferProgressView @JvmOverloads constructor(
   context: Context,
   attrs: AttributeSet? = null,