Update StateBasedText.kt

Author: MagicalMeghan

compose/snippets/src/main/java/com/example/compose/snippets/text/StateBasedText.kt

@@ -19,6 +19,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.foundation.text.input.InputTransformation
 import androidx.compose.foundation.text.input.OutputTransformation
@@ -144,21 +145,16 @@ fun TextFieldInitialState() {
     // [END android_compose_state_text_7]
 }
 
+@Preview(showBackground = true)
 @Composable
 fun TextFieldBuffer() {
     // [START android_compose_state_text_8]
-    val phoneNumberState = rememberTextFieldState()
-
-    LaunchedEffect(phoneNumberState) {
-        phoneNumberState.edit { // TextFieldBuffer scope
-            append("123456789")
-        }
-    }
+    val phoneNumberState = rememberTextFieldState("123456789")
 
     TextField(
         state = phoneNumberState,
         inputTransformation = InputTransformation { // TextFieldBuffer scope
-            if (asCharSequence().isDigitsOnly()) {
+            if (!asCharSequence().isDigitsOnly()) {
                 revertAllChanges()
             }
         },
@@ -174,32 +170,37 @@ fun TextFieldBuffer() {
 @Preview
 @Composable
 fun EditTextFieldState() {
-    // [START android_compose_state_text_9]
+    Text("Happy Cat")
     val usernameState = rememberTextFieldState("I love Android")
+    editTFState(usernameState)
+}
+
+fun editTFState(textFieldState: TextFieldState){
+    // [START android_compose_state_text_9]
     // textFieldState.text : I love Android
     // textFieldState.selection: TextRange(14, 14)
-    usernameState.edit { insert(14, "!") }
+    textFieldState.edit { insert(14, "!") }
     // textFieldState.text : I love Android!
     // textFieldState.selection: TextRange(15, 15)
-    usernameState.edit { replace(7, 14, "Compose") }
+    textFieldState.edit { replace(7, 14, "Compose") }
     // textFieldState.text : I love Compose!
     // textFieldState.selection: TextRange(15, 15)
-    usernameState.edit { append("!!!") }
+    textFieldState.edit { append("!!!") }
     // textFieldState.text : I love Compose!!!!
     // textFieldState.selection: TextRange(18, 18)
-    usernameState.edit { selectAll() }
+    textFieldState.edit { selectAll() }
     // textFieldState.text : I love Compose!!!!
     // textFieldState.selection: TextRange(0, 18)
     // [END android_compose_state_text_9]
 
     // [START android_compose_state_text_10]
-    usernameState.setTextAndPlaceCursorAtEnd("I really love Android")
+    textFieldState.setTextAndPlaceCursorAtEnd("I really love Android")
     // textFieldState.text : I really love Android
     // textFieldState.selection : TextRange(21, 21)
     // [END android_compose_state_text_10]
 
     // [START android_compose_state_text_11]
-    usernameState.clearText()
+    textFieldState.clearText()
     // textFieldState.text :
     // textFieldState.selection : TextRange(0, 0)
     // [END android_compose_state_text_11]