Usernames 1.01 Fast-Follow Part 1.

app/src/main/java/org/thoughtcrime/securesms/permissions/compose/Permissions.kt

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.permissions.compose
+
+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.graphics.painter.Painter
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
+import com.google.accompanist.permissions.isGranted
+import com.google.accompanist.permissions.rememberPermissionState
+import org.signal.core.ui.Dialogs
+import org.thoughtcrime.securesms.R
+
+/**
+ * Dialogs and state management for permissions requests in compose screens.
+ */
+object Permissions {
+
+  interface Controller {
+    fun request()
+  }
+
+  private enum class RequestState {
+    NONE,
+    RATIONALE,
+    SYSTEM
+  }
+
+  @Composable
+  fun cameraPermissionHandler(
+    rationale: String,
+    onPermissionGranted: () -> Unit
+  ): Controller {
+    return permissionHandler(
+      permission = android.Manifest.permission.CAMERA,
+      icon = painterResource(id = R.drawable.symbol_camera_24),
+      rationale = rationale,
+      onPermissionGranted = onPermissionGranted
+    )
+  }
+
+  /**
+   * Generic permissions rationale dialog and state management for single permissions.
+   */
+  @OptIn(ExperimentalPermissionsApi::class)
+  @Composable
+  fun permissionHandler(
+    permission: String,
+    icon: Painter,
+    rationale: String,
+    onPermissionGranted: () -> Unit
+  ): Controller {
+    var requestState by remember {
+      mutableStateOf(RequestState.NONE)
+    }
+
+    val permissionState = rememberPermissionState(permission = permission) {
+      if (it && requestState == RequestState.SYSTEM) {
+        onPermissionGranted()
+      }
+    }
+
+    if (requestState == RequestState.RATIONALE) {
+      Dialogs.PermissionRationaleDialog(
+        icon = icon,
+        rationale = rationale,
+        confirm = stringResource(id = R.string.Permissions_continue),
+        dismiss = stringResource(id = R.string.Permissions_not_now),
+        onConfirm = {
+          requestState = RequestState.SYSTEM
+          permissionState.launchPermissionRequest()
+        },
+        onDismiss = {
+          requestState = RequestState.NONE
+        }
+      )
+    }
+
+    return object : Controller {
+      override fun request() {
+        if (permissionState.status.isGranted) {
+          requestState = RequestState.NONE
+          onPermissionGranted()
+        } else {
+          requestState = RequestState.RATIONALE
+        }
+      }
+    }
+  }
+}