Экран продукта теперь открывается на редактирование. Победа.

app/src/main/java/com/example/shawarma/data/dao/ProductDao.kt

@@ -29,5 +29,5 @@ interface ProductDao {
     fun getItems() : Flow<List<ProductModel>>
 
     @Query("select * from products where products.id = :id")
-    fun getById(id: Int): ProductModel
+    fun getById(id: Int): Flow<ProductModel>
 }

app/src/main/java/com/example/shawarma/screens/MainNavBar.kt

@@ -8,10 +8,12 @@ import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.navigation.NavType
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
+import androidx.navigation.navArgument
 import com.example.shawarma.screens.authorization.AuthorizationScreen
 import com.example.shawarma.screens.cart.CartScreen
 import com.example.shawarma.screens.discount.DiscountScreen
@@ -61,8 +63,19 @@ fun MainNavBar() {
             composable(ScreenPaths.products.name) {
                 ProductsScreen(navController)
             }
-            composable(ScreenPaths.product.name) {
-                ProductScreen(navController)
+            composable(
+                route = ScreenPaths.product.name + "?productId={productId}",
+                arguments = listOf(
+                    navArgument("productId") {
+                        defaultValue = 0
+                        type = NavType.IntType
+                    }
+                )
+
+            ) { navBackStackEntry ->
+                /* Extracting the id from the route */
+                val productId = navBackStackEntry.arguments?.getInt("productId")
+                ProductScreen(navController, productId)
             }
         }
     }

app/src/main/java/com/example/shawarma/screens/products/ProductScreen.kt

@@ -15,17 +15,22 @@ import androidx.compose.material.Button
 import androidx.compose.material.ButtonDefaults
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.zIndex
 import androidx.navigation.NavHostController
+import com.example.shawarma.data.db.AppDatabase
+import com.example.shawarma.data.models.ProductModel
 import com.example.shawarma.ui.theme.MarckFamily
 import com.example.shawarma.ui.theme.MyLightYellow
 import com.example.shawarma.ui.theme.MyMainBackground
@@ -33,22 +38,42 @@ import com.example.shawarma.ui.theme.MyOrange
 import com.example.shawarma.ui.theme.NunitoFamily
 import com.example.shawarma.widgets.MyTextField
 import com.example.shawarma.widgets.ShawarmaLogo2
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 
 @Composable
-fun ProductScreen(navHostController: NavHostController) {
+fun ProductScreen(navHostController: NavHostController, productId: Int?) {
     Box(
         contentAlignment = Alignment.TopCenter
     ) {
-        ProductWidget(navHostController)
+        ProductWidget(navHostController, productId)
         ShawarmaLogo2()
     }
 }
 
 @Composable
-fun ProductWidget(navHostController: NavHostController) {
+fun ProductWidget(navHostController: NavHostController, productId: Int?) {
     val title = remember { mutableStateOf(TextFieldValue(""))}
     val price = remember { mutableStateOf(TextFieldValue(""))}
     val oldPrice = remember { mutableStateOf(TextFieldValue(""))}
+
+    if (productId != 0 && productId != null) {
+        val context = LocalContext.current
+        var product = remember {
+            mutableStateOf(ProductModel(id = -1, title = "", price = 0, oldPrice = null))
+        }
+        LaunchedEffect(Unit) {
+            withContext(Dispatchers.IO) {
+                AppDatabase.getInstance(context).productDao().getById(productId).collect { data ->
+                    product.value = data
+                }
+            }
+        }
+        title.value = TextFieldValue(text = product.value.title)
+        price.value = TextFieldValue(text = product.value.price.toString())
+        oldPrice.value = TextFieldValue(text = product.value.oldPrice.toString())
+    }
+
     Box(
         modifier = Modifier
             .clip(shape = RoundedCornerShape(30.dp))

app/src/main/java/com/example/shawarma/screens/products/ProductsScreen.kt

@@ -118,7 +118,7 @@ fun ProductsList(navHostController: NavHostController){
         )
         {
             items(products.size) { index ->
-                ProductItem(products[index])
+                ProductItem(products[index], navHostController)
                 Spacer(modifier = Modifier.height(20.dp))
                 if (index == products.size - 1) {
                     Spacer(modifier = Modifier.height(70.dp))
@@ -130,7 +130,7 @@ fun ProductsList(navHostController: NavHostController){
 }
 
 @Composable
-fun ProductItem(product: ProductModel){
+fun ProductItem(product: ProductModel, navHostController: NavHostController){
     Card(
         border = BorderStroke(width = 2.dp, color = MyOrange),
         shape = RoundedCornerShape(size = 20.dp),
@@ -178,7 +178,11 @@ fun ProductItem(product: ProductModel){
                 colors = ButtonDefaults.buttonColors(
                     backgroundColor = MyLightYellow
                 ),
-                onClick = { /*TODO*/ }
+                onClick = {
+                    navHostController.navigate(
+                        route = ScreenPaths.product.name + "?productId=" + product.id.toString()
+                    )
+                }
             ) {
                 Icon(
                     painter = painterResource(id = R.drawable.pen_icon),

app/src/main/java/com/example/shawarma/widgets/MyTextField.kt

@@ -32,7 +32,7 @@ fun MyTextField(
         placeholder = {
             Text(
                 text = placeholder,
-                fontSize = 14.sp,
+                fontSize = 16.sp,
                 style = TextStyle(
                     fontFamily = JejuFamily
                 )
@@ -41,7 +41,7 @@ fun MyTextField(
         singleLine = singleLine,
         shape = RoundedCornerShape(20.dp),
         textStyle = TextStyle(
-            fontSize = 14.sp,
+            fontSize = 16.sp,
             fontFamily = JejuFamily
         ),
         colors = TextFieldDefaults.textFieldColors(