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UIKit native wrappers for Compose Multiplatform Cupertino Widgets
There is a newer version: 0.1.0-alpha04
/*
 * Copyright (c) 2023 Compose Cupertino project and open source contributors.
 *
 * 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.
 */

@file:OptIn(ExperimentalForeignApi::class)

package io.github.alexzhirkevich.cupertino

import androidx.compose.foundation.gestures.Orientation
import androidx.compose.runtime.Composable
import androidx.compose.runtime.NonRestartableComposable
import androidx.compose.runtime.key
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.util.fastForEach
import androidx.compose.ui.window.DialogProperties
import kotlinx.cinterop.ExperimentalForeignApi
import platform.UIKit.UIAlertAction
import platform.UIKit.UIAlertActionStyle
import platform.UIKit.UIAlertActionStyleCancel
import platform.UIKit.UIAlertActionStyleDefault
import platform.UIKit.UIAlertActionStyleDestructive
import platform.UIKit.UIAlertController
import platform.UIKit.UIAlertControllerStyleActionSheet
import platform.UIKit.UIAlertControllerStyleAlert

@Composable
@NonRestartableComposable
actual fun CupertinoAlertDialogNative(
    onDismissRequest : () -> Unit,
    title: String?,
    message: String?,
    containerColor : Color,
    shape: Shape,
    properties: DialogProperties,
    buttonsOrientation: Orientation,
    buttons : NativeAlertDialogActionsScope.() -> Unit
) = UIAlertController(
    onDismissRequest = onDismissRequest,
    title = title,
    message = message,
    style = UIAlertControllerStyleAlert,
    buttons = buttons,
)

@Composable
actual fun CupertinoActionSheetNative(
    visible : Boolean,
    onDismissRequest : () -> Unit,
    title : String?,
    message : String?,
    containerColor : Color,
    secondaryContainerColor : Color,
    properties: DialogProperties,
    buttons : NativeAlertDialogActionsScope.() -> Unit
) {
    if (visible) {
        UIAlertController(
            onDismissRequest = onDismissRequest,
            title = title,
            message = message,
            style = UIAlertControllerStyleActionSheet,
            buttons = buttons,
        )
    }
}


//@Composable
//@NonRestartableComposable
//actual fun CupertinoSheetNative(
//    onDismissRequest: () -> Unit,
//    containerColor: Color,
//    shape: Shape,
//    elevation : Dp,
//    gesturesEnabled : Boolean,
//    content: @Composable () -> Unit
//) {
//    val context = currentCompositionLocalContext
//
//    PresentableDialog(
//        factory = {
//            ComposeUIViewController {
//                CompositionLocalProvider(context) {
//                    content()
//                }
//            }
//        },
//        onDismissRequest = onDismissRequest,
//        update = {}
//    )
//}

@Suppress("UNCHECKED_CAST")
@Composable
internal fun UIAlertController(
    onDismissRequest: () -> Unit,
    title: String?,
    message: String?,
    style: UIAlertActionStyle,
    buttons: NativeAlertDialogActionsScope.() -> Unit,
) {
    val buttonsList = NativeAlertDialogButtonsScopeImpl(onDismissRequest)
        .apply(buttons)
        .buttons

    val titles = buttonsList.map { it.title }
    val styles = buttonsList.map { it.style }

    key(titles, styles) {
        PresentationController(
            factory = {
                UIAlertController.alertControllerWithTitle(
                    title = title,
                    message = message,
                    preferredStyle = style
                ).apply {
                    buttonsList.fastForEach {
                        addAction(it)
                    }
                }
            },
            update = {
                setTitle(title)
                setMessage(message)
                
                (actions as List).zip(buttonsList).fastForEach {
                    it.first.setEnabled(it.second.enabled)
                }
            },
            onDismissRequest = onDismissRequest,
//        presentationStyle = presentationStyle,
            title, message
        )
    }
}

private class NativeAlertDialogButtonsScopeImpl(
    val onDismissRequest: () -> Unit,
) : NativeAlertDialogActionsScope {

    val buttons = mutableListOf()

    override fun action(
        onClick: () -> Unit,
        style: AlertActionStyle,
        enabled: Boolean,
        title: String
    ) {
        buttons += UIAlertAction.actionWithTitle(
            title = title,
            style = style.ui,
            handler = {
                onClick()
                onDismissRequest()
            }
        ).apply {
            setEnabled(enabled)
        }

    }
}



internal val AlertActionStyle.ui : UIAlertActionStyle get() =
    when(this){
        AlertActionStyle.Default -> UIAlertActionStyleDefault
        AlertActionStyle.Cancel -> UIAlertActionStyleCancel
        AlertActionStyle.Destructive -> UIAlertActionStyleDestructive
    }