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import android.content.Context | |
import android.os.SystemClock | |
import android.support.v4.widget.SwipeRefreshLayout | |
import android.util.AttributeSet | |
/** | |
* ContentLoadingSwipeRefreshLayout implements a SwipeRefreshLayout that waits a minimum time to | |
* dismiss the refreshing indicator before showing. Once visible, the refreshing indicator 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). | |
*/ | |
class ContentLoadingSwipeRefreshLayout( | |
context: Context, | |
attrs: AttributeSet | |
) : SwipeRefreshLayout(context, attrs) { | |
private companion object { | |
const val MIN_SHOW_TIME_MS = 500L | |
const val MIN_DELAY_MS = 500L | |
const val TIME_NOT_SET = -1L | |
} | |
private var startTime = TIME_NOT_SET | |
private var postedHide = false | |
private var postedShow = false | |
private var dismissed = false | |
private val delayedShow = Runnable { | |
postedShow = false | |
if (!dismissed) { | |
startTime = SystemClock.elapsedRealtime() | |
super.setRefreshing(true) | |
} | |
} | |
private val delayedHide = Runnable { | |
postedHide = false | |
startTime = TIME_NOT_SET | |
super.setRefreshing(false) | |
} | |
override fun setRefreshing(refreshing: Boolean) { | |
if (refreshing) { | |
showRefreshing() | |
} else { | |
hideRefreshing() | |
} | |
} | |
override fun onAttachedToWindow() { | |
super.onAttachedToWindow() | |
removeCallbacks() | |
} | |
override fun onDetachedFromWindow() { | |
super.onDetachedFromWindow() | |
removeCallbacks() | |
} | |
private fun showRefreshing() { | |
startTime = TIME_NOT_SET | |
dismissed = false | |
removeCallbacks(delayedHide) | |
if (!postedShow) { | |
postDelayed(delayedShow, MIN_DELAY_MS) | |
postedShow = true | |
} | |
} | |
private fun hideRefreshing() { | |
dismissed = true | |
removeCallbacks(delayedShow) | |
val timeDiff = System.currentTimeMillis() - startTime | |
if (timeDiff >= MIN_SHOW_TIME_MS || startTime == TIME_NOT_SET) { | |
// The refreshing indicator has been shown long enough | |
// or was not shown yet. If it wasn't shown yet, | |
// it will just never be shown. | |
super.setRefreshing(false) | |
} else { | |
// The refreshing indicator is shown, but not long enough, | |
// so put a delayed message in to hide it when its been | |
// shown long enough. | |
if (!postedHide) { | |
postDelayed(delayedHide, MIN_SHOW_TIME_MS - timeDiff) | |
postedHide = true | |
} | |
} | |
} | |
private fun removeCallbacks() { | |
removeCallbacks(delayedShow) | |
removeCallbacks(delayedHide) | |
} | |
} |
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