Jetpack Compose，在TextField中自定义光标位置
Jetpack Compose，在TextField中自定义光标位置
提问于 2021-01-04 22:23:40
当TextField获得焦点时，如何将光标设置在任意位置？相当于editText.setSelection(position)的经典android视图系统。
这是我用来让编辑文本在添加到屏幕时自动接收焦点的代码。我希望能够将光标从默认位置0移动
val (getText, setText) = remember { mutableStateOf("hello") }
AutofocusEditText(
text = getText,
setText = setText
)
...
@Composable
private fun AutofocusEditText(
text: String,
setText : (String) -> Unit
) {
val focusState = remember { mutableStateOf(FocusState.Inactive) }
val focusRequester = FocusRequester()
val focusModifier = Modifier.focus()
Row(
modifier = Modifier.focusObserver { newFocusValue -> focusState.value = newFocusValue }
) {
val focusRequesterModifier =
Modifier.focusRequester(focusRequester)
TextField(
value = text,
modifier = focusModifier.then(focusRequesterModifier),
backgroundColor = Color.Transparent,
onValueChange = setText,
keyboardOptions = KeyboardOptions.Default.copy(
imeAction = ImeAction.Done
),
onImeActionPerformed = { action, softKeyboardController ->
if (action == ImeAction.Done) {
softKeyboardController?.hideSoftwareKeyboard()
}
}
)
}
onActive {
focusRequester.requestFocus()
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2021-01-04 23:46:09
您必须使用TextField的TextFieldValue版本。
@Composable
fun TextField(
value: TextFieldValue,
onValueChange: (TextFieldValue) -> Unit,
/* ... */) {/* Impl */}代码的简化版本：
@Composable
fun AutoFocusingText() {
val textState = remember { mutableStateOf(TextFieldValue()) }
val focusState = remember { mutableStateOf(FocusState.Inactive) }
val focusRequester = FocusRequester()
val focusModifier = Modifier.focus()
Row(
modifier = Modifier.focusObserver { focusState.value = it }
) {
val focusRequesterModifier = Modifier.focusRequester(focusRequester)
TextField(
modifier = focusModifier.then(focusRequesterModifier),
value = textState.value,
onValueChange = { value: TextFieldValue ->
textState.value = value
}
)
}
onActive {
focusRequester.requestFocus()
}
}如果初始值为非空字符串，则必须手动更改选择。将空TextFieldValue替换为：TextFieldValue(text = value, selection = TextRange(value.length, value.length))
当您想要像在代码中那样提取值时。您可以将当前选择作为参数添加，也可以将其与TextFieldValue结合提取。否则，如果用户在文本中间进行编辑，光标将跳回到下一个onValueChanged的末尾。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/65564282
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