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ProgressTimeLatch.kt
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ProgressTimeLatch.kt
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/*
* Copyright 2017 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package me.banes.chris.tivi.ui
import android.os.Handler
import android.os.Looper
import android.os.SystemClock
/**
* A class which acts as a time latch for show progress bars UIs. It waits a minimum time to be
* dismissed before showing. Once visible, the progress bar will be visible for
* a minimum amount of time to avoid "flashes" in the UI when an event could take
* a largely variable time to complete (from none, to a user perceivable amount).
*
* Works with an view through the lambda API.
*/
class ProgressTimeLatch(
private val delayMs: Long = 750,
private val minShowTime: Long = 500,
private val viewRefreshingToggle: ((Boolean) -> Unit)
) {
private val handler = Handler(Looper.getMainLooper())
private var showTime = 0L
private val delayedShow = Runnable(this::show)
private val delayedHide = Runnable(this::hideAndReset)
var refreshing = false
set(value) {
if (field != value) {
field = value
handler.removeCallbacks(delayedShow)
handler.removeCallbacks(delayedHide)
if (value) {
handler.postDelayed(delayedShow, delayMs)
} else if (showTime >= 0) {
// We're already showing, lets check if we need to delay the hide
val showTime = SystemClock.uptimeMillis() - showTime
if (showTime < minShowTime) {
handler.postDelayed(delayedHide, minShowTime - showTime)
} else {
// We've been showing longer than the min, so hide and clean up
hideAndReset()
}
} else {
// We're not currently show so just hide and clean up
hideAndReset()
}
}
}
private fun show() {
viewRefreshingToggle(true)
showTime = SystemClock.uptimeMillis()
}
private fun hideAndReset() {
viewRefreshingToggle(false)
showTime = 0
}
}