/*
* Copyright 2019 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.ui.input.pointer
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.node.InternalCoreApi
/**
* The normalized data structure for pointer input event information that is taken in processed by
* Compose (via the [PointerInputEventProcessor]).
*
* All pointer locations are relative to the device screen.
*/
@InternalCoreApi
internal expect class PointerInputEvent {
val uptime: Long
val pointers: List<PointerInputEventData>
}
/**
* Data that describes a particular pointer
*
* [positionOnScreen] is relative to the device screen. [position] is relative to the owner.
*/
internal data class PointerInputEventData(
val id: PointerId,
val uptime: Long,
val positionOnScreen: Offset,
val position: Offset,
val down: Boolean,
val type: PointerType
)
/**
* Represents a pointer input event internally.
*
* [PointerInputChange]s are stored in a map so that as this internal event traverses the tree,
* it is efficient to split the changes between those that are relevant to the sub tree and those
* that are not.
*/
@OptIn(InternalCoreApi::class)
internal expect class InternalPointerEvent(
changes: Map<PointerId, PointerInputChange>,
pointerInputEvent: PointerInputEvent
) {
val changes: Map<PointerId, PointerInputChange>
}