Update README.md

tutorials/Window_API_new/README.md

@@ -526,17 +526,45 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.window.WindowDraggableArea
+import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.window.singleWindowApplication
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
 
-fun main() = singleWindowApplication(
-    undecorated = true
-) {
-    WindowDraggableArea {
-        Box(Modifier.fillMaxWidth().height(48.dp).background(Color.DarkGray))
+fun main() = application {
+    Window(onCloseRequest = ::exitApplication) {
+        WindowDraggableArea {
+            Box(Modifier.fillMaxWidth().height(48.dp).background(Color.DarkGray))
+        }
     }
 }
 ```
+Note that `WindowDraggableArea` can be used only inside `singleWindowApplication`, `Window` and `Dialog`. If you need to use it in the other Composable function, pass `WindowScope` as a reciever there:
+```
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.window.WindowDraggableArea
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.WindowScope
+import androidx.compose.ui.window.application
+
+fun main() = application {
+    Window(onCloseRequest = ::exitApplication) {
+        AppWindowTitleBar()
+    }
+}
+
+@Composable
+private fun WindowScope.AppWindowTitleBar() = WindowDraggableArea {
+    Box(Modifier.fillMaxWidth().height(48.dp).background(Color.DarkGray))
+}
+```
 ![](draggable_area.gif)