JetpackCompose实现对话框和进度条实例解析

@Composable
fun Dialog(
    onDismissRequest: () -> Unit, // 当我们打算关闭对话框时会执行
    properties: DialogProperties = DialogProperties(), // 对话框的属性，用于自定义
    content: @Composable () -> Unit // 对话框的内容
)

 @OptIn(ExperimentalComposeUiapi::class)
    @Composable
    fun FullDialog() {
        Dialog(
            onDismissRequest = {  },
            properties = DialogProperties(usePlatfORMDefaultWidth = false)
        ) {
            Surface(modifier = Modifier.fillMaxSize(), color = Color.Gray) {
                Text(text = "Hello World")
            }
        }
    }

@Immutable
class DialogProperties @ExperimentalComposeUiApi constructor(
    val dismissOnBackPress: Boolean = true, // 是否可以在按下系统返回键的时候取消对话框
    val dismissOnClickOutside: Boolean = true,// 是否可以点击对话框以外的区域取消对话框
    val securePolicy: SecureFlagPolicy = SecureFlagPolicy.Inherit,
    @Suppress("EXPERIMENTAL_ANNOTATioN_ON_WRONG_TARGET")
    @get:ExperimentalComposeUiApi
    val usePlatformDefaultWidth: Boolean = true // 对话框的内容是否需要限制在平台默认的范围之内
) 

 @Composable
    fun DialogDemo(){
        val openDialog = remember {
            mutableStateOf(true)
        }
        val dialogWidth = 200.dp
        val dialogHeight = 50.dp
        if(openDialog.value){
            Dialog(onDismissRequest = { openDialog.value = false }) {
                Box(modifier = Modifier
                    .size(dialogWidth, dialogHeight)
                    .background(Color.White)){
                    Text(text = "Hello World")
                }
            }
        }
    }

    @Composable
    fun AlertDialogDemo()
    {
        val openDialog = remember {
            mutableStateOf(true)
        }
        if(openDialog.value){
            AlertDialog(onDismissRequest = { openDialog.value = false },
            title = {
                Text(text = "开启位置服务")
            }, text = {
                Text(text = "这将意味着我们会给您提供精确的位置信息")
                },
            confirmButton = {
                TextButton(onClick = { openDialog.value = false}) {
                    Text(text = "同意")
                }
            },
            dismissButton = {
                TextButton(onClick = {  openDialog.value = false}) {
                    Text(text = "取消")
                }
            })
        }
    }

  @Composable
    fun ProgressBarDemo()
    {
        var progress by remember {
            mutableStateOf(0.1f)
        }
        val animatedProgress by animateFloatAsState(targetValue = progress,
        animationSpec = ProgressIndicatorDefaults.ProgressAnimationSpec)
        Column {
            CircularProgressIndicator(progress = animatedProgress)
            Spacer(modifier = Modifier.requiredHeight(30.dp))
            OutlinedButton(onClick = { if (progress < 1f) progress += 0.1f}) {
                Text(text = "增加进度")
            }
        }
    }