add createGraph sample

SmartToolFactory · SmartToolFactory · commit 2d3a557da2c0 · 2024-10-31T14:17:13.000+03:00
diff --git a/Tutorial3-1Navigation/src/main/java/com/smarttoolfactory/tutorial3_1navigation/Tutorial7_1NavControllerCreateGraph.kt b/Tutorial3-1Navigation/src/main/java/com/smarttoolfactory/tutorial3_1navigation/Tutorial7_1NavControllerCreateGraph.kt
@@ -1,10 +1,71 @@
 package com.smarttoolfactory.tutorial3_1navigation
 
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.navigation.NavController
+import androidx.navigation.NavGraph
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
+import androidx.navigation.createGraph
 
 @Preview
 @Composable
 fun Tutorial7_1Screen() {
+    MainContainer()
+}
 
-}
+@Composable
+private fun MainContainer() {
+    val navController = rememberNavController()
+
+    // Changing this destination changes where graph will start
+    val startDestination = RouteA
+
+    // This NavGraph will be used with NavHost this navHostController will be assigned
+    val navGraph: NavGraph = remember(startDestination) {
+        navController.createGraph(
+            startDestination = startDestination
+        ) {
+            addNavGraph(navController)
+        }
+    }
+
+    NavHost(
+        modifier = Modifier.fillMaxSize(),
+        navController = navController,
+        graph = navGraph,
+    )
+
+    // Other Alternative
+//        NavHost(
+//            modifier = Modifier.fillMaxSize(),
+//            navController = navController,
+//            startDestination = RouteA
+//        ) {
+//            addNavGraph(navController)
+//        }
+}
+
+private fun NavGraphBuilder.addNavGraph(navController: NavController) {
+
+    composable<RouteA> {
+        RouteAScreen(navController)
+    }
+
+    composable<RouteB> {
+        RouteBScreen(navController)
+    }
+
+    composable<RouteC> {
+        RouteCScreen(navController)
+    }
+
+    composable<RouteD> {
+        RouteDScreen(navController)
+    }
+}
