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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package io.legado.app.utils | ||
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| import android.os.SystemClock | ||
| import kotlin.math.max | ||
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| @Suppress("MemberVisibilityCanBePrivate") | ||
| open class Debounce<T>( | ||
| var wait: Long = 0L, | ||
| var maxWait: Long = -1L, | ||
| var leading: Boolean = false, | ||
| var trailing: Boolean = true, | ||
| private val func: () -> T | ||
| ) { | ||
| companion object { | ||
| private val handler by lazy { buildMainHandler() } | ||
| } | ||
|
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| private var lastCallTime = -1L | ||
| private var lastInvokeTime = 0L | ||
| private val maxing get() = maxWait != -1L | ||
| private var result: T? = null | ||
| private var hasTimer = false | ||
| private val timerExpiredRunnable = Runnable { | ||
| timerExpired() | ||
| } | ||
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| init { | ||
| maxWait = if (maxing) max(maxWait, wait) else maxWait | ||
| } | ||
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| private fun invokeFunc(time: Long): T { | ||
| lastInvokeTime = time | ||
| return func.invoke().also { result = it } | ||
| } | ||
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| private fun startTimer(wait: Long) { | ||
| hasTimer = true | ||
| handler.postDelayed(timerExpiredRunnable, wait) | ||
| } | ||
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| private fun cancelTimer() { | ||
| handler.removeCallbacks(timerExpiredRunnable) | ||
| } | ||
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| private fun leadingEdge(time: Long): T? { | ||
| lastInvokeTime = time | ||
| startTimer(wait) | ||
| return if (leading) invokeFunc(time) else result | ||
| } | ||
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| private fun trailingEdge(time: Long): T? { | ||
| hasTimer = false | ||
| return if (trailing) invokeFunc(time) else result | ||
| } | ||
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| private fun remainingWait(time: Long): Long { | ||
| val timeSinceLastCall = time - lastCallTime | ||
| val timeSinceLastInvoke = time - lastInvokeTime | ||
| val timeWaiting = wait - timeSinceLastCall | ||
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| return if (maxing) timeWaiting.coerceAtMost(maxWait - timeSinceLastInvoke) else timeWaiting | ||
| } | ||
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| private fun shouldInvoke(time: Long): Boolean { | ||
| val timeSinceLastCall = time - lastCallTime | ||
| val timeSinceLastInvoke = time - lastInvokeTime | ||
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| return lastCallTime == -1L | ||
| || timeSinceLastCall >= wait | ||
| || timeSinceLastCall < 0 | ||
| || maxing && timeSinceLastInvoke >= maxWait | ||
| } | ||
|
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| private fun timerExpired() { | ||
| val time = SystemClock.uptimeMillis() | ||
| if (shouldInvoke(time)) { | ||
| trailingEdge(time) | ||
| } else { | ||
| startTimer(remainingWait(time)) | ||
| } | ||
| } | ||
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| fun cancel() { | ||
| if (hasTimer) { | ||
| cancelTimer() | ||
| } | ||
| lastInvokeTime = 0 | ||
| lastCallTime = -1L | ||
| hasTimer = false | ||
| } | ||
|
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| fun flush(): T? { | ||
| return if (hasTimer) trailingEdge(SystemClock.uptimeMillis()) else result | ||
| } | ||
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| fun pending(): Boolean = hasTimer | ||
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| operator fun invoke(): T? { | ||
| val time = SystemClock.uptimeMillis() | ||
| val isInvoking = shouldInvoke(time) | ||
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| lastCallTime = time | ||
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| if (isInvoking) { | ||
| if (!hasTimer) { | ||
| return leadingEdge(lastCallTime) | ||
| } | ||
| if (maxing) { | ||
| startTimer(wait) | ||
| return invokeFunc(lastCallTime) | ||
| } | ||
| } | ||
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| if (!hasTimer) { | ||
| startTimer(wait) | ||
| } | ||
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| return result | ||
| } | ||
|
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package io.legado.app.utils | ||
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| @Suppress("unused") | ||
| class Throttle<T>( | ||
| wait: Long = 0L, | ||
| leading: Boolean = true, | ||
| trailing: Boolean = true, | ||
| func: () -> T | ||
| ) : Debounce<T>(wait, wait, leading, trailing, func) |