macosMain.androidx.compose.foundation.gestures.MacosScrollable.macos.kt Maven / Gradle / Ivy

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Higher level abstractions of the Compose UI primitives. This library is design system agnostic, providing the high-level building blocks for both application and design-system developers

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/*
 * Copyright 2022 The Android Open Source Project
 *
 * 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 androidx.compose.foundation.gestures

import androidx.compose.ui.appkit.appkitEventOrNull
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.input.pointer.PointerEvent
import androidx.compose.ui.node.CompositionLocalConsumerModifierNode
import androidx.compose.ui.unit.Density
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.dp

internal actual fun CompositionLocalConsumerModifierNode.platformScrollConfig(): ScrollConfig =
    MacOsScrollConfig

private object MacOsScrollConfig : ScrollConfig {
    // See https://developer.apple.com/documentation/appkit/nsevent/1535387-scrollingdeltay
    override fun Density.calculateMouseWheelScroll(event: PointerEvent, bounds: IntSize): Offset {
        val e = event.appkitEventOrNull ?: return Offset.Zero

        // The multiplier value was derived from desktop MacOSCocoaConfig
        val multiplier = if (e.hasPreciseScrollingDeltas) 1.0F else 10.dp.toPx()

        return Offset(
            x = e.scrollingDeltaX.toFloat() * multiplier,
            y = e.scrollingDeltaY.toFloat() * multiplier,
        )
    }
}