Update the 'BitwardenTopAppBar' to make the navigation icon optional (#232)

app/src/main/java/com/x8bit/bitwarden/ui/platform/components/BitwardenTopAppBar.kt

@@ -36,6 +36,35 @@ fun BitwardenTopAppBar(
     navigationIcon: Painter,
     navigationIconContentDescription: String,
     onNavigationIconClick: () -> Unit,
+    actions: @Composable RowScope.() -> Unit = { },
+) {
+    BitwardenTopAppBar(
+        title = title,
+        scrollBehavior = scrollBehavior,
+        navigationIcon = NavigationIcon(
+            navigationIcon = navigationIcon,
+            navigationIconContentDescription = navigationIconContentDescription,
+            onNavigationIconClick = onNavigationIconClick,
+        ),
+        actions = actions,
+    )
+}
+
+/**
+ * Represents a Bitwarden styled [TopAppBar] that assumes the following components:
+ *
+ * - an optional single navigation control in the upper-left defined by [navigationIcon].
+ * - a [title] in the middle.
+ * - a [actions] lambda containing the set of actions (usually icons or similar) to display
+ *  in the app bar's trailing side. This lambda extends [RowScope], allowing flexibility in
+ *  defining the layout of the actions.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun BitwardenTopAppBar(
+    title: String,
+    scrollBehavior: TopAppBarScrollBehavior,
+    navigationIcon: NavigationIcon?,
     actions: @Composable RowScope.() -> Unit = {},
 ) {
     TopAppBar(
@@ -45,14 +74,16 @@ fun BitwardenTopAppBar(
         ),
         scrollBehavior = scrollBehavior,
         navigationIcon = {
-            IconButton(
-                onClick = { onNavigationIconClick() },
-            ) {
-                Icon(
-                    painter = navigationIcon,
-                    contentDescription = navigationIconContentDescription,
-                    tint = MaterialTheme.colorScheme.onSurface,
-                )
+            navigationIcon?.let {
+                IconButton(
+                    onClick = it.onNavigationIconClick,
+                ) {
+                    Icon(
+                        painter = it.navigationIcon,
+                        contentDescription = it.navigationIconContentDescription,
+                        tint = MaterialTheme.colorScheme.onSurface,
+                    )
+                }
             }
         },
         title = {
@@ -77,9 +108,24 @@ private fun BitwardenTopAppBar_preview() {
                 .exitUntilCollapsedScrollBehavior(
                     rememberTopAppBarState(),
                 ),
-            navigationIcon = painterResource(id = R.drawable.ic_close),
-            navigationIconContentDescription = stringResource(id = R.string.close),
-            onNavigationIconClick = {},
+            navigationIcon = NavigationIcon(
+                navigationIcon = painterResource(id = R.drawable.ic_close),
+                navigationIconContentDescription = stringResource(id = R.string.close),
+                onNavigationIconClick = { },
+            ),
         )
     }
 }
+
+/**
+ * Represents all data required to display a [navigationIcon].
+ *
+ * @property navigationIcon The [Painter] displayed as part of the icon.
+ * @property navigationIconContentDescription The content description associated with the icon.
+ * @property onNavigationIconClick The click action that is invoked when the icon is tapped.
+ */
+data class NavigationIcon(
+    val navigationIcon: Painter,
+    val navigationIconContentDescription: String,
+    val onNavigationIconClick: () -> Unit,
+)