PM-34231: feat: Support renaming attachments during creation (#6742)

ui/src/main/kotlin/com/bitwarden/ui/platform/components/util/NonEditableExtensionVisualTransformation.kt

@@ -0,0 +1,78 @@
+package com.bitwarden.ui.platform.components.util
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.input.OffsetMapping
+import androidx.compose.ui.text.input.TransformedText
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.ui.text.withStyle
+import com.bitwarden.ui.platform.theme.BitwardenTheme
+
+/**
+ * Returns the [VisualTransformation] that alters the output of the text in an input field by
+ * appending a '.' followed by the [fileExtension] to the display text.
+ */
+@Composable
+fun nonEditableExtensionVisualTransformation(
+    fileExtension: String?,
+    fileExtensionColor: Color = BitwardenTheme.colorScheme.filledButton.foregroundDisabled,
+): VisualTransformation =
+    remember(fileExtension, fileExtensionColor) {
+        NonEditableExtensionVisualTransformation(
+            fileExtension = fileExtension,
+            fileExtensionColor = fileExtensionColor,
+        )
+    }
+
+/**
+ * Alters the visual output of the text in an input field.
+ *
+ * This will append a '.' followed by the [fileExtension] to the display text but not allow users
+ * to alter that text. If the `fileExtension` is null, then no alteration will occur.
+ */
+private class NonEditableExtensionVisualTransformation(
+    private val fileExtension: String?,
+    private val fileExtensionColor: Color,
+) : VisualTransformation {
+    override fun filter(
+        text: AnnotatedString,
+    ): TransformedText = TransformedText(
+        text.buildTransformedAnnotatedString(
+            fileExtension = fileExtension,
+            fileExtensionColor = fileExtensionColor,
+        ),
+        text.getOffsetMapping(),
+    )
+}
+
+private fun AnnotatedString.buildTransformedAnnotatedString(
+    fileExtension: String?,
+    fileExtensionColor: Color,
+): AnnotatedString {
+    val extension = fileExtension ?: return this
+    val builder = AnnotatedString.Builder()
+    builder.append(this)
+    builder.withStyle(SpanStyle(color = fileExtensionColor)) { append(".$extension") }
+    return builder.toAnnotatedString()
+}
+
+private fun AnnotatedString.getOffsetMapping(): OffsetMapping =
+    object : OffsetMapping {
+        override fun originalToTransformed(offset: Int): Int {
+            // We always use the regular offset here since the extension is off-limits.
+            return offset
+        }
+
+        override fun transformedToOriginal(
+            offset: Int,
+        ): Int = if (offset > this@getOffsetMapping.length) {
+            // If we are in the extension space, pull us back into the regular text.
+            this@getOffsetMapping.length
+        } else {
+            // We are within the limits, so leave the offset alone.
+            offset
+        }
+    }

ui/src/main/res/values/strings.xml

@@ -206,6 +206,7 @@ Scanning will happen automatically.</string>
     <string name="choose_file">Choose file</string>
     <string name="file">File</string>
     <string name="no_file_chosen">No file chosen</string>
+    <string name="file_name">File name</string>
     <string name="no_attachments">There are no attachments.</string>
     <string name="file_source">File Source</string>
     <string name="max_file_size">Maximum file size is 100 MB.</string>