Jetpack Compose：无法去除AlertDialog的白色边角背景

在Compose Desktop中，AlertDialog的白色边角是因为组件默认带有底层窗口背景容器，即使自定义了shape和backgroundColor，仍会露出默认的白色边角。以下两种方法可以解决：

方法一：用Dialog自定义完整弹窗 #

直接使用基础Dialog组件搭建弹窗，完全控制样式，彻底避免默认样式干扰：

Dialog(onDismissRequest = {}) {
    Surface(
        shape = RoundedCornerShape(16.dp),
        color = Colors.DARKER_GRAY,
        modifier = Modifier.defaultMinSize(300.dp)
    ) {
        Column(
            modifier = Modifier.padding(24.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Text(
                "თქვენ ტოვებთ პროგრამას",
                color = Colors.WHITE,
                modifier = Modifier.padding(bottom = 16.dp)
            )
            Text(
                "ნამდვილად გსურთ პროგრამიდან გასვლა?",
                color = Colors.WHITE,
                modifier = Modifier.padding(bottom = 24.dp)
            )
            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.End
            ) {
                TextButton(onClick = onNegativeClick) {
                    Text("არა", color = Colors.LIGHTER_GRAY)
                }
                TextButton(onClick = onPositiveClick) {
                    Text("დიახ", color = Colors.RED)
                }
            }
        }
    }
}

方法二：修改AlertDialog的属性与修饰符 #

如果想继续使用AlertDialog，通过以下调整可以去除白色边角：

AlertDialog(
    title = { Text("თქვენ ტოვებთ პროგრამას") },
    text = { Text("ნამდვილად გსურთ პროგრამიდან გასვლა?") },
    onDismissRequest = {},
    backgroundColor = Colors.DARKER_GRAY,
    contentColor = Colors.WHITE,
    shape = RoundedCornerShape(16.dp),
    confirmButton = {
        TextButton(onClick = onPositiveClick) {
            Text(text = "დიახ", color = Colors.RED)
        }
    },
    dismissButton = {
        TextButton(onClick = onNegativeClick) {
            Text(text = "არა", color = Colors.LIGHTER_GRAY)
        }
    },
    modifier = Modifier.defaultMinSize(300.dp).clip(RoundedCornerShape(16.dp)),
    properties = DialogProperties(decorFitsSystemWindows = false)
)

关键改动：

• 添加Modifier.clip(RoundedCornerShape(16.dp))确保内容按圆角裁切
• 设置DialogProperties(decorFitsSystemWindows = false)关闭默认窗口适配，避免底层白色背景透出

内容的提问来源于stack exchange，提问作者grgg7