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150 changes: 150 additions & 0 deletions
150
sample/compose-app/src/commonMain/kotlin/OffsetIndicator.kt
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| import androidx.compose.animation.core.* | ||
| import androidx.compose.foundation.ExperimentalFoundationApi | ||
| import androidx.compose.foundation.background | ||
| import androidx.compose.foundation.border | ||
| import androidx.compose.foundation.gestures.draggable2D | ||
| import androidx.compose.foundation.gestures.rememberDraggable2DState | ||
| import androidx.compose.foundation.layout.* | ||
| import androidx.compose.foundation.shape.CircleShape | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.rememberCoroutineScope | ||
| import androidx.compose.runtime.rememberUpdatedState | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.clip | ||
| import androidx.compose.ui.draw.drawBehind | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.geometry.Size | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.input.pointer.PointerIcon | ||
| import androidx.compose.ui.input.pointer.pointerHoverIcon | ||
| import androidx.compose.ui.platform.LocalDensity | ||
| import androidx.compose.ui.unit.DpOffset | ||
| import androidx.compose.ui.unit.dp | ||
| import kotlinx.coroutines.launch | ||
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| @Composable | ||
| fun rememberOffsetIndicatorState( | ||
| onValueChange: (DpOffset) -> Unit, | ||
| ): OffsetIndicatorState { | ||
| val onValueChangeState = rememberUpdatedState(onValueChange) | ||
| return remember { | ||
| OffsetIndicatorState( | ||
| onValueChange = { onValueChangeState.value.invoke(it) } | ||
| ) | ||
| } | ||
| } | ||
|
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||
| class OffsetIndicatorState( | ||
| val onValueChange: (DpOffset) -> Unit, | ||
| ) { | ||
| private val animatable = Animatable(DpOffset.Zero, DpOffset.VectorConverter) | ||
| val targetValue get() = animatable.targetValue | ||
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| suspend fun snapTo(offset: DpOffset) { | ||
| animatable.snapTo(offset) | ||
| onValueChange.invoke(offset) | ||
| } | ||
|
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| suspend fun animateTo(offset: DpOffset) { | ||
| onValueChange.invoke(offset) | ||
| animatable.animateTo(offset, spring(stiffness = Spring.StiffnessHigh)) | ||
| } | ||
| } | ||
|
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| private val DpOffset.VectorConverter: TwoWayConverter<Offset, AnimationVector2D> | ||
| get() = TwoWayConverter( | ||
| convertToVector = { AnimationVector2D(it.x, it.y) }, | ||
| convertFromVector = { Offset(it.v1, it.v2) } | ||
| ) | ||
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| @OptIn(ExperimentalFoundationApi::class) | ||
| @Composable | ||
| fun OffsetIndicator( | ||
| state: OffsetIndicatorState, | ||
| modifier: Modifier = Modifier | ||
| ) { | ||
| val density = LocalDensity.current | ||
| val coroutineScope = rememberCoroutineScope() | ||
| Box(modifier) { | ||
| BoxWithConstraints( | ||
| modifier = Modifier.fillMaxSize() | ||
| .border(1.dp, color = OFFSET_INDICATOR_LINE_COLOR) | ||
| .drawBehind { | ||
| drawLine( | ||
| OFFSET_INDICATOR_LINE_COLOR, | ||
| strokeWidth = .5f, | ||
| start = size.TopCenterOffset, | ||
| end = size.BottomCenterOffset | ||
| ) | ||
| drawLine( | ||
| OFFSET_INDICATOR_LINE_COLOR, | ||
| strokeWidth = .5f, | ||
| start = size.CenterLeftOffset, | ||
| end = size.CenterRightOffset, | ||
| ) | ||
| } | ||
| ) { | ||
| val boxWidth = maxWidth.value.dp | ||
|
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| val realOffset = | ||
| DpOffset( | ||
| state.targetValue.x + boxWidth / 2 - MOVABLE_POINTER_SIZE / 2, | ||
| state.targetValue.y + boxWidth / 2 - MOVABLE_POINTER_SIZE / 2 | ||
| ) | ||
| val draggable2DState = rememberDraggable2DState { | ||
| with(density) { | ||
| DpOffset( | ||
| (state.targetValue.x + it.x.toDp()).coerceIn(-boxWidth / 2, boxWidth / 2), | ||
| (state.targetValue.y + it.y.toDp()).coerceIn(-boxWidth / 2, boxWidth / 2), | ||
| ).let { | ||
| println("${state.targetValue}result $it") | ||
| coroutineScope.launch { state.snapTo(it) } | ||
| } | ||
| } | ||
| } | ||
| Box( | ||
| modifier = Modifier | ||
| .offset(realOffset.x, realOffset.y) | ||
| .size(MOVABLE_POINTER_SIZE) | ||
| .clip(CircleShape) | ||
| .pointerHoverIcon(PointerIcon.Hand) | ||
| .background(Color.Blue) | ||
| .draggable2D(draggable2DState) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
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| private val OFFSET_INDICATOR_LINE_COLOR = Color.LightGray | ||
| private val MOVABLE_POINTER_SIZE = 10.dp | ||
|
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| private val Size.TopLeftOffset: Offset | ||
| get() = Offset.Zero | ||
|
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| private val Size.TopCenterOffset: Offset | ||
| get() = Offset(width / 2, 0f) | ||
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| private val Size.TopRightOffset: Offset | ||
| get() = Offset(width, 0f) | ||
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| private val Size.CenterLeftOffset: Offset | ||
| get() = Offset(0f, height / 2) | ||
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| private val Size.CenterOffset: Offset | ||
| get() = Offset(width / 2, height / 2) | ||
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| private val Size.CenterRightOffset: Offset | ||
| get() = Offset(width, height / 2) | ||
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| private val Size.BottomLeftOffset: Offset | ||
| get() = Offset(0f, height) | ||
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| private val Size.BottomCenterOffset: Offset | ||
| get() = Offset(width / 2, height) | ||
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| private val Size.BottomRightOffset: Offset | ||
| get() = Offset(width, height) |
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