从forEachGesture迁移到awaitEachGesture

Question

我有一个应用程序(有一个重复的按钮)，我正在更新到Compose 1.4.0，我看到forEachGesture已被弃用。它告诉我使用awaitEachGesture。

我试图迁移我的代码，但我有一个永无止境的循环，因为down。Pressed总是true

这是旧的代码可以工作。

fun Modifier.repeatingClickable(
interactionSource: InteractionSource,
enabled: Boolean = true,
maxDelayMillis: Long = 500,
minDelayMillis: Long = 50,
delayDecayFactor: Float = .20f,
onClick: () -> Unit
): Modifier = composed {
val currentClickListener by rememberUpdatedState(onClick)
pointerInput(interactionSource, enabled) {
forEachGesture {
coroutineScope {
awaitPointerEventScope {
val down = awaitFirstDown(requireUnconsumed = false)
val heldButtonJob = launch {
var currentDelayMillis = maxDelayMillis
while (enabled && down.pressed) {
currentClickListener()
delay(currentDelayMillis)
val nextMillis =
currentDelayMillis - (currentDelayMillis * delayDecayFactor)
currentDelayMillis = nextMillis.toLong().coerceAtLeast(minDelayMillis)
}
}
waitForUpOrCancellation()
heldButtonJob.cancel()
}
}
}
}
}

下面是我的最新尝试。

fun Modifier.repeatingClickable(
interactionSource: InteractionSource,
enabled: Boolean = true,
maxDelayMillis: Long = 500,
minDelayMillis: Long = 50,
delayDecayFactor: Float = .20f,
onClick: () -> Unit
): Modifier = composed {
val currentClickListener by rememberUpdatedState(onClick)
pointerInput(interactionSource, enabled) {
awaitEachGesture {
val down = awaitFirstDown(requireUnconsumed = false)
while (enabled && down.pressed) {
var currentDelayMillis = maxDelayMillis
currentClickListener()
val nextMillis =
currentDelayMillis - (currentDelayMillis * delayDecayFactor)
currentDelayMillis = nextMillis.toLong().coerceAtLeast(minDelayMillis)
}

waitForUpOrCancellation()
}
}
}

我应该如何迁移这个?

Answer 1

要迁移到awaitEachGesture，将enabled包裹在rememberUpdatedState中，并使用之前使用enabled的变量。然后在awaitEachGesture中创建一个CoroutineScope来启动heldButtonJob。

val currentClickListener by rememberUpdatedState(onClick)
val isEnabled by rememberUpdatedState(enabled)
pointerInput(interactionSource, isEnabled) {
awaitEachGesture {
val down = awaitFirstDown(requireUnconsumed = false)
val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
val heldButtonJob = scope.launch {
var currentDelayMillis = maxDelayMillis
while (isEnabled && down.pressed) {
currentClickListener()
delay(currentDelayMillis)
val nextMillis =
currentDelayMillis - (currentDelayMillis * delayDecayFactor)
currentDelayMillis = nextMillis.toLong().coerceAtLeast(minDelayMillis)
}
}
waitForUpOrCancellation()
heldButtonJob.cancel()
}
}