Jetpack Compose：ModalBottomSheet的expand()为何为internal？如何调用？

在使用ModalBottomSheet时，发现sheetState提供了show()和hide()两个公开方法。其中show()的文档及实现如下：

/**
 * Show the bottom sheet with animation and suspend until it's shown. If the sheet is taller
 * than 50% of the parent's height, the bottom sheet will be half expanded. Otherwise it will be
 * fully expanded.
 *
 * @throws [CancellationException] if the animation is interrupted
 */
suspend fun show() {
    val targetValue = when {
        hasHalfExpandedState -> HalfExpanded
        else -> Expanded
    }
    animateTo(targetValue = targetValue)
}

但仅调用sheetState.show()时，偶尔会出现底部弹窗半展开的情况，导致UI不一致。查看源码后发现有一个expand()内部方法正是我需要的：

/**
 * Fully expand the bottom sheet with animation and suspend until it if fully expanded or
 * animation has been cancelled.
 * *
 * @throws [CancellationException] if the animation is interrupted
 */
internal suspend fun expand() = animateTo(Expanded)

但该方法是internal修饰的，无法从外部访问。请问有没有办法通过sheetState强制将底部弹窗切换到完全展开状态？

你可以直接调用sheetState的公开方法animateTo(Expanded)来实现强制完全展开的效果，这和内部的expand()方法逻辑完全一致。

示例代码：

// 在协程作用域内调用
coroutineScope.launch {
    sheetState.animateTo(ModalBottomSheetValue.Expanded)
}

另外，如果你希望从根源上避免半展开状态，可以在创建ModalBottomSheetState时，设置skipHalfExpanded = true，这样show()方法会直接将弹窗完全展开：

val sheetState = rememberModalBottomSheetState(
    initialValue = ModalBottomSheetValue.Hidden,
    skipHalfExpanded = true
)

这种方式更适合全局需要禁用半展开的场景，无需每次调用都手动指定展开状态。

内容的提问来源于stack exchange，提问作者Gastón Saillán