TP-65294 | Updated transformation logic for crash fix & support for amount editing via cursor movement (#11240)

android/navi-pay/src/main/kotlin/com/navi/pay/management/common/sendmoney/util/CurrencyMaskTransformation.kt

@@ -1,6 +1,6 @@
 /*
  *
- *  * Copyright © 2022 by Navi Technologies Limited
+ *  * Copyright © 2022-2024 by Navi Technologies Limited
  *  * All rights reserved. Strictly confidential
  *
  */
@@ -11,6 +11,7 @@ import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.input.OffsetMapping
 import androidx.compose.ui.text.input.TransformedText
 import androidx.compose.ui.text.input.VisualTransformation
+import com.navi.pay.utils.COMMA_CHAR
 import com.navi.pay.utils.formattedCurrency
 
 class CurrencyMaskTransformation(private val amountMaxLength: Int) : VisualTransformation {
@@ -21,14 +22,29 @@ class CurrencyMaskTransformation(private val amountMaxLength: Int) : VisualTrans
             else text.text
         val formattedText = trimmedAmount.formattedCurrency()
 
+        val originalToTransformed = mutableListOf<Int>()
+        val transformedToOriginal = mutableListOf<Int>()
+        var specialCharsCount = 0
+
+        formattedText.forEachIndexed { index, char ->
+            if (char == COMMA_CHAR) {
+                specialCharsCount++
+            } else {
+                originalToTransformed.add(index)
+            }
+            transformedToOriginal.add(index - specialCharsCount)
+        }
+        originalToTransformed.add(originalToTransformed.maxOrNull()?.plus(1) ?: 0)
+        transformedToOriginal.add(transformedToOriginal.maxOrNull()?.plus(1) ?: 0)
+
         val numberOffsetTranslator =
             object : OffsetMapping {
                 override fun originalToTransformed(offset: Int): Int {
-                    return formattedText.length
+                    return originalToTransformed[offset]
                 }
 
                 override fun transformedToOriginal(offset: Int): Int {
-                    return trimmedAmount.length
+                    return transformedToOriginal[offset]
                 }
             }
 

android/navi-pay/src/main/kotlin/com/navi/pay/utils/NaviPayConstants.kt

@@ -196,6 +196,7 @@ const val PIPE = "|"
 const val DOT = "."
 const val DECIMAL = "."
 const val COMMA = ","
+const val COMMA_CHAR = ','
 const val UTF8 = "UTF-8"
 const val X = "X"
 const val AT_THE_RATE_CHAR = '@'