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@ -1,5 +1,5 @@
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/*
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* Copyright 2021 The Android Open Source Project
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -57,8 +57,17 @@ import kotlinx.coroutines.delay
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import kotlin.math.max
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import kotlin.math.min
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private const val SCROLLBAR_PRESS_DELAY = 10L
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private const val SCROLLBAR_PRESS_DELTA = 0.02f
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/**
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* The delay between scrolls when a user long presses on the scrollbar track to initiate a scroll
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* instead of dragging the scrollbar thumb.
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*/
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private const val SCROLLBAR_PRESS_DELAY_MS = 10L
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/**
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* The percentage displacement of the scrollbar when scrolled by long presses on the scrollbar
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* track.
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*/
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private const val SCROLLBAR_PRESS_DELTA_PCT = 0.02f
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/**
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* Class definition for the core properties of a scroll bar
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@ -91,10 +100,11 @@ private value class ScrollbarTrack(
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}
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/**
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* Creates a scrollbar state with the listed properties
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* Creates a [ScrollbarState] with the listed properties
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* @param thumbSizePercent the thumb size of the scrollbar as a percentage of the total track size
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* @param thumbDisplacementPercent the distance the thumb has traveled as a percentage of total
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* track size
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* track size. Refers to either the thumb width (for horizontal scrollbars)
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* or height (for vertical scrollbars).
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*/
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fun ScrollbarState(
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thumbSizePercent: Float,
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@ -162,7 +172,7 @@ internal fun Orientation.valueOf(intOffset: IntOffset) = when (this) {
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}
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/**
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* A Composable for drawing a Scrollbar
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* A Composable for drawing a scrollbar
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* @param orientation the scroll direction of the scrollbar
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* @param state the state describing the position of the scrollbar
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* @param minThumbSize the minimum size of the scrollbar thumb
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@ -219,7 +229,7 @@ fun Scrollbar(
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}
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}
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// Scrollbar track container
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// scrollbar track container
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Box(
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modifier = modifier
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.run {
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@ -275,7 +285,7 @@ fun Scrollbar(
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a = with(localDensity) { thumbDisplacementPx.toDp() },
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b = 0.dp,
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)
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// Scrollbar thumb container
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// scrollbar thumb container
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Box(
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modifier = Modifier
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.align(Alignment.TopStart)
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@ -319,7 +329,7 @@ fun Scrollbar(
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dimension = orientation.valueOf(pressedOffset),
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)
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val isPositive = currentThumbDisplacement < destinationThumbDisplacement
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val delta = SCROLLBAR_PRESS_DELTA * if (isPositive) 1f else -1f
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val delta = SCROLLBAR_PRESS_DELTA_PCT * if (isPositive) 1f else -1f
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while (currentThumbDisplacement != destinationThumbDisplacement) {
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currentThumbDisplacement = when {
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@ -334,7 +344,7 @@ fun Scrollbar(
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}
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onThumbDisplaced(currentThumbDisplacement)
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interactionThumbTravelPercent = currentThumbDisplacement
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delay(SCROLLBAR_PRESS_DELAY)
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delay(SCROLLBAR_PRESS_DELAY_MS)
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}
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}
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TJ Dahunsi
1 year ago