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Move DefaultHardwareShortcutDetector to /internal
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...commonMain/kotlin/me/saket/telephoto/zoomable/internal/DefaultHardwareShortcutDetector.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package me.saket.telephoto.zoomable.internal | ||
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| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.input.key.Key | ||
| import androidx.compose.ui.input.key.KeyEvent | ||
| import androidx.compose.ui.input.key.isAltPressed | ||
| import androidx.compose.ui.input.key.isCtrlPressed | ||
| import androidx.compose.ui.input.key.isMetaPressed | ||
| import androidx.compose.ui.input.key.key | ||
| import androidx.compose.ui.input.pointer.PointerEvent | ||
| import androidx.compose.ui.input.pointer.PointerEventType | ||
| import androidx.compose.ui.input.pointer.isAltPressed | ||
| import androidx.compose.ui.util.fastFold | ||
| import androidx.compose.ui.util.fastForEach | ||
| import me.saket.telephoto.zoomable.HardwareShortcutDetector | ||
| import kotlin.math.absoluteValue | ||
|
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| internal object DefaultHardwareShortcutDetector : HardwareShortcutDetector { | ||
| override fun detectKey(event: KeyEvent): HardwareShortcutDetector.ShortcutEvent? { | ||
| // Note for self: Some devices/peripherals have dedicated zoom buttons that map to Key.ZoomIn | ||
| // and Key.ZoomOut. Examples include: Samsung Galaxy Camera, a motorcycle handlebar controller. | ||
| if (event.key == Key.ZoomIn || event.isZoomInEvent()) { | ||
| return HardwareShortcutDetector.ShortcutEvent.Zoom(HardwareShortcutDetector.ShortcutEvent.ZoomDirection.In) | ||
| } else if (event.key == Key.ZoomOut || (event.isZoomOutEvent())) { | ||
| return HardwareShortcutDetector.ShortcutEvent.Zoom(HardwareShortcutDetector.ShortcutEvent.ZoomDirection.Out) | ||
| } | ||
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| val panDirection = when (event.key) { | ||
| Key.DirectionUp -> HardwareShortcutDetector.ShortcutEvent.PanDirection.Up | ||
| Key.DirectionDown -> HardwareShortcutDetector.ShortcutEvent.PanDirection.Down | ||
| Key.DirectionLeft -> HardwareShortcutDetector.ShortcutEvent.PanDirection.Left | ||
| Key.DirectionRight -> HardwareShortcutDetector.ShortcutEvent.PanDirection.Right | ||
| else -> null | ||
| } | ||
| return when (panDirection) { | ||
| null -> null | ||
| else -> HardwareShortcutDetector.ShortcutEvent.Pan( | ||
| direction = panDirection, | ||
| panOffset = HardwareShortcutDetector.ShortcutEvent.DefaultPanOffset * if (event.isAltPressed) 10f else 1f, | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| private fun KeyEvent.isZoomInEvent(): Boolean { | ||
| return this.key == Key.Equals && when (HostPlatform.current) { | ||
| HostPlatform.Android -> isCtrlPressed | ||
| HostPlatform.Desktop -> isMetaPressed | ||
| } | ||
| } | ||
|
|
||
| private fun KeyEvent.isZoomOutEvent(): Boolean { | ||
| return key == Key.Minus && when (HostPlatform.current) { | ||
| HostPlatform.Android -> isCtrlPressed | ||
| HostPlatform.Desktop -> isMetaPressed | ||
| } | ||
| } | ||
|
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||
| override fun detectScroll(event: PointerEvent): HardwareShortcutDetector.ShortcutEvent? { | ||
| if (!event.keyboardModifiers.isAltPressed) { | ||
| // Google Photos does not require any modifier key to be pressed for zooming into | ||
| // images using mouse scroll. Telephoto does not follow the same pattern because | ||
| // it might migrate to 2D scrolling in the future for panning content once Compose | ||
| // UI supports it. | ||
| return null | ||
| } | ||
| return when (val scrollY = event.calculateScroll().y) { | ||
| 0f -> null | ||
| else -> HardwareShortcutDetector.ShortcutEvent.Zoom( | ||
| direction = if (scrollY < 0f) HardwareShortcutDetector.ShortcutEvent.ZoomDirection.In else HardwareShortcutDetector.ShortcutEvent.ZoomDirection.Out, | ||
| centroid = event.calculateScrollCentroid(), | ||
| // Scroll delta always seems to be either 1f or -1f depending on the direction. | ||
| // Although some mice are capable of sending precise scrolls, I'm assuming | ||
| // Android coerces them to be at least (+/-)1f. | ||
| zoomFactor = HardwareShortcutDetector.ShortcutEvent.DefaultZoomFactor * scrollY.absoluteValue, | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| private fun PointerEvent.calculateScroll(): Offset { | ||
| return changes.fastFold(Offset.Zero) { acc, c -> | ||
| acc + c.scrollDelta | ||
| } | ||
| } | ||
|
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||
| private fun PointerEvent.calculateScrollCentroid(): Offset { | ||
| check(type == PointerEventType.Scroll) | ||
| var centroid = Offset.Zero | ||
| var centroidWeight = 0f | ||
| changes.fastForEach { change -> | ||
| val position = change.position | ||
| centroid += position | ||
| centroidWeight++ | ||
| } | ||
| return when (centroidWeight) { | ||
| 0f -> Offset.Unspecified | ||
| else -> centroid / centroidWeight | ||
| } | ||
| } | ||
| } |