TextField
中使用VisualTransformation
。TextField(
value = text,
onValueChange = { text = it },
visualTransformation = ColorsTransformation()
)
在 VisualTransformation
中,您可以使用 AnnotatedString
来显示具有多个样式的文本。class ColorsTransformation() : VisualTransformation {
override fun filter(text: AnnotatedString): TransformedText {
return TransformedText(
buildAnnotatedStringWithColors(text.toString()),
OffsetMapping.Identity)
}
}
使用:
fun buildAnnotatedStringWithColors(text:String): AnnotatedString{
val words: List<String> = text.split("\\s+".toRegex())// splits by whitespace
val colors = listOf(Color.Red,Color.Black,Color.Yellow,Color.Blue)
var count = 0
val builder = AnnotatedString.Builder()
for (word in words) {
builder.withStyle(style = SpanStyle(color = colors[count%4])) {
append("$word ")
}
count ++
}
return builder.toAnnotatedString()
}
TextField(
value = text,
onValueChange = { text = it },
visualTransformation = {
TransformedText(
buildAnnotatedStringWithColors(text),
OffsetMapping.Identity
)
}
)
fun buildAnnotatedStringWithColors(text:String): AnnotatedString{ ... }