added main app composable with navgraph

app/src/main/java/be/ugent/sel/studeez/StudeezApp.kt

@@ -0,0 +1,81 @@
+package be.ugent.sel.studeez
+
+import android.content.res.Resources
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.ReadOnlyComposable
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
+import be.ugent.sel.studeez.common.snackbar.SnackbarManager
+import be.ugent.sel.studeez.navigation.StudeezDestinations
+import be.ugent.sel.studeez.screens.splash.SplashScreen
+import be.ugent.sel.studeez.ui.theme.StudeezTheme
+import kotlinx.coroutines.CoroutineScope
+
+@Composable
+fun StudeezApp() {
+    StudeezTheme {
+        Surface(color = MaterialTheme.colors.background) {
+            val appState = rememberAppState()
+
+            Scaffold(
+                snackbarHost = {
+                    SnackbarHost(
+                        hostState = it,
+                        modifier = Modifier.padding(8.dp),
+                        snackbar = { snackbarData ->
+                            Snackbar(snackbarData, contentColor = MaterialTheme.colors.onPrimary)
+                        }
+                    )
+                },
+                scaffoldState = appState.scaffoldState
+            ) { innerPaddingModifier ->
+                NavHost(
+                    navController = appState.navController,
+                    startDestination = StudeezDestinations.SPLASH_SCREEN,
+                    modifier = Modifier.padding(innerPaddingModifier)
+                ) {
+                    studeezGraph(appState)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun rememberAppState(
+    scaffoldState: ScaffoldState = rememberScaffoldState(),
+    navController: NavHostController = rememberNavController(),
+    snackbarManager: SnackbarManager = SnackbarManager,
+    resources: Resources = resources(),
+    coroutineScope: CoroutineScope = rememberCoroutineScope()
+) =
+    remember(scaffoldState, navController, snackbarManager, resources, coroutineScope) {
+        StudeezAppstate(scaffoldState, navController, snackbarManager, resources, coroutineScope)
+    }
+
+@Composable
+@ReadOnlyComposable
+fun resources(): Resources {
+    LocalConfiguration.current
+    return LocalContext.current.resources
+}
+
+fun NavGraphBuilder.studeezGraph(appState: StudeezAppstate) {
+
+    composable(StudeezDestinations.SPLASH_SCREEN) {
+        SplashScreen(openAndPopUp = { route, popUp -> appState.navigateAndPopUp(route, popUp) })
+    }
+
+
+}