英文:
Alternate use of View.INVISIBLE in jetpack compose
问题
在 Jetpack Compose 中，使用 AnimatedVisibility 来达到 XML 中 View.INVISIBLE 的效果。这个方法可以让视图在不可见时不占据布局空间。示例代码如下：
AnimatedVisibility(
// true or false
) {
Button() // 按钮的代码
}
英文:
In xml we use View.INVISIBLE to just don't show the view at all, but it still takes up space for layout purposes. What is the alternative in jetpack compose?
AnimatedVisibility(
// true or false
) {
Button() // button code.
}
答案1
得分: 6
你可以构建一个自定义修饰符来测量组合内容所占据的空间。
类似这样的代码：
fun Modifier.visible(visible: Boolean) = if (visible) this else this.then(Invisible)
private object Invisible : LayoutModifier {
override fun MeasureScope.measure(
measurable: Measurable,
constraints: Constraints
): MeasureResult {
val placeable = measurable.measure(constraints)
return layout(placeable.width, placeable.height) {}
}
}
英文:
You can build a custom modifier to measure the Composable to take up space.
Something like:
fun Modifier.visible(visible: Boolean) = if (visible) this else this.then(Invisible)
private object Invisible : LayoutModifier {
override fun MeasureScope.measure(
measurable: Measurable,
constraints: Constraints
): MeasureResult {
val placeable = measurable.measure(constraints)
return layout(placeable.width, placeable.height) {}
}
}
答案2
得分: 1
以下是代码的翻译部分：
// 接受的答案非常完美，但您还可以查看以下代码。
@Composable
fun ShowContentOrNot() {
var isShow by remember { mutableStateOf(true) }
Column(
modifier = Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
if (isShow)
Text(text = "Some content")
Spacer(modifier = Modifier.height(20.dp))
Button(onClick = {
isShow = !isShow
}) {
Text(text = "Hide/Show")
}
}
}
请注意，由于原始代码中包含HTML实体（例如"），我已将它们还原为普通文本。
英文:
The Accepted answer is perfect , but you can also look into the below code.
@Composable
fun ShowContentOrNot() {
var isShow by remember { mutableStateOf(true) }
Column(
modifier = Modifier.fillMaxSize(),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
if (isShow)
Text(text = "Some content")
Spacer(modifier = Modifier.height(20.dp))
Button(onClick = {
isShow = !isShow
}) {
Text(text = "Hide/Show")
}
}
}
答案3
得分: 0
我只使用alpha修饰符扩展函数来实现这个功能，它可以涵盖90%的使用情况，除非你正在将alpha通道用于其他用途。例如，我可以这样做，对于文本：
Text( modifier = Modifier.alpha(0f), text = "Lorem Ipsum")
英文:
I just use the alpha Modifier extension function to achieve this functionality which may cover 90% of the use cases, unless you're using the alpha channel for other purposes. I do it like this, for example, on a text:
Text( modifier = Modifier.alpha(0f), text = "Lorem Ipsum")
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