added splashscreen

app/src/main/java/be/ugent/sel/studeez/screens/splash/SplashScreen.kt

@@ -0,0 +1,55 @@
+package be.ugent.sel.studeez.screens.splash
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.CircularProgressIndicator
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.hilt.navigation.compose.hiltViewModel
+import be.ugent.sel.studeez.common.composable.BasicButton
+import be.ugent.sel.studeez.common.ext.basicButton
+import kotlinx.coroutines.delay
+import be.ugent.sel.studeez.R.string as AppText
+
+private const val SPLASH_TIMEOUT = 1000L
+
+@Composable
+fun SplashScreen(
+    openAndPopUp: (String, String) -> Unit,
+    modifier: Modifier = Modifier,
+    viewModel: SplashViewModel = hiltViewModel()
+) {
+    Column(
+        modifier =
+        modifier
+            .fillMaxWidth()
+            .fillMaxHeight()
+            .background(color = MaterialTheme.colors.background)
+            .verticalScroll(rememberScrollState()),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        if (viewModel.showError.value) {
+            Text(text = stringResource(AppText.generic_error))
+
+            BasicButton(AppText.try_again, Modifier.basicButton()) { viewModel.onAppStart(openAndPopUp) }
+        } else {
+            CircularProgressIndicator(color = MaterialTheme.colors.onBackground)
+        }
+    }
+
+    LaunchedEffect(true) {
+        delay(SPLASH_TIMEOUT)
+        viewModel.onAppStart(openAndPopUp)
+    }
+}

app/src/main/java/be/ugent/sel/studeez/screens/splash/SplashViewModel.kt

@@ -0,0 +1,26 @@
+package be.ugent.sel.studeez.screens.splash
+
+import androidx.compose.runtime.mutableStateOf
+import be.ugent.sel.studeez.domain.AccountDAO
+import be.ugent.sel.studeez.domain.LogService
+import be.ugent.sel.studeez.screens.StudeezViewModel
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+
+@HiltViewModel
+class SplashViewModel @Inject constructor(
+    private val accountDAO: AccountDAO,
+    logService: LogService
+) : StudeezViewModel(logService) {
+    val showError = mutableStateOf(false)
+
+    fun onAppStart(openAndPopUp: (String, String) -> Unit) {
+
+        showError.value = false
+        if (accountDAO.hasUser) {
+            // openAndPopUp( <homeScreen>, SPLASH_SCREEN)
+        } else{
+            // openAndPopUp(<login>, SPLASH_SCREEN)
+        }
+    }
+}