Compose - 交互组合项

按钮 Button

OutLinedButton带外边框、TextButton只是文字、IconButton只是图标形状。

Button(
    onClick = { }, //点击回调
    modifier = Modifier,
    enabled = true, //启用或禁用
    interactionSource = MutableInteractionSource(),
    elevation = ButtonDefaults.elevatedButtonElevation( //高度（阴影）
        defaultElevation = 10.dp,   //启用时
        pressedElevation = 0.dp,   //按下时
        focusedElevation = 10.dp,
        hoveredElevation = 10.dp,
        disabledElevation = 10.dp   //未启用时
    ),
    shape = ButtonDefaults.shape,    //形状
    border = BorderStroke(width = 1.dp, color = Color.Red), //边框线
    colors = ButtonDefaults.buttonColors(   //颜色（还有textButtonColors、outlineButtonColors）
        containerColor = Color.Yellow,  //启用状态下的背景色
        contentColor = Color.Red,   //启动状态下的文本色
        disabledContainerColor = Color.Black,   //禁用状态下的背景色
        disabledContentColor = Color.Green  //禁用状态下的文本色
    ),
    contentPadding = ButtonDefaults.ContentPadding,    //内容内间距
) {
    //子元素
}

输入框 TextField

var str by remember{ mutableStateOf("123456") }
TextField(
    modifier = Modifier,
    value = str,
    onValueChange = { str = it },
    textStyle = LocalTextStyle.current, //设置文本样式
    label = { Text(text = "标签文本") },    //显示在输入框边框上的提示文本
    placeholder = { Text(text = "提示文本") },  //内容为空时的提示文本
    supportingText = { Text(text = "输入框下面显示的文本") },   //
    leadingIcon = { Icon(imageVector = Icons.Default.Home, contentDescription = null) }, //左边图标
    trailingIcon = { Icon(imageVector = Icons.Default.Star, contentDescription = null) }, //右边图标
    isError = false,
    enabled = true, //是否启用
    readOnly =  false,  //是否只读，不可编辑，可复制
    singleLine = false,  //单行（设为true会忽略maxLines）
    maxLines = 5,   //最大行数
    visualTransformation = VisualTransformation.None,
    //输入类型(Text、Number、Phone、Email、Password、NumberPassword)
    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
    //键盘功能键监听
    keyboardActions = KeyboardActions(onDone = {}, onGo = {}, onNext = {}, onPrevious = {}, onSearch = {}, onSend = {}),
    shape = TextFieldDefaults.filledShape,
    colors = TextFieldDefaults.textFieldColors()
)

带边框的输入框 OutlinedTextField

代码可设置的内容同 TextField 一样。

基本输入框 BasicTextField

可设置内容少，适合自定义。

BasicTextField(
    modifier = Modifier,
    value = str,
    onValueChange = { str = it },
    textStyle = LocalTextStyle.current, //设置文本样式
    enabled = true, //是否启用
    readOnly =  false,  //是否只读，不可编辑，可复制
    singleLine = false,  //单行（设为true会忽略maxLines）
    maxLines = 5,   //最大行数
    minLines = 1,   //最小行数
    visualTransformation = VisualTransformation.None,
    //输入类型(Text、Number、Phone、Email、Password、NumberPassword)
    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
    //键盘功能键监听
    keyboardActions = KeyboardActions(onDone = {}, onGo = {}, onNext = {}, onPrevious = {}, onSearch = {}, onSend = {}),
)

拖动条 Slider

var state by remember{ mutableStateOf(0.0F) }
Slider(
    value = state,   //当前值
    valueRange = 0F..100F,  //可选值范围（默认0F..1F）
    steps = 4,  //步频（默认0，设置了就中间只有这个值可选拖到）
    enabled = true, //是否禁用
    onValueChange = { float ->
        state = float
    }
)

范围拖动条 RangeSlider

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun Demo() {
    var state by remember{ mutableStateOf(5F..10F) }
    RangeSlider(
        value = state,  //注意值是一个范围
        valueRange = 0F..30F,   //可选值范围（默认0F..1F）
        steps = 3,  //步频（默认0，设置了就中间只有这个值可选拖到）
        onValueChange = {
            state = it
        }
    )
}

复选框 CheckBox

fun Show() {
    val dataist = listOf("香菜", "酱油", "陈醋", "葱花", "蒜泥", "辣椒")
    Demo(dataist)
}

@Composable
fun Demo(list: List<String>) {
    //根据选项列表，创建相同数量的布尔值集合
    val state = remember { list.map { false }.toMutableStateList() }
    //根据选项列表，创建相同数量的复选框
    Column {
        state.forEachIndexed { index, value ->
            Row {
                Checkbox(
                    modifier = Modifier,
                    checked = value,    //是否选中
                    enabled = true, //是否启用
                    colors = CheckboxDefaults.colors(),
                    onCheckedChange = { boolean ->    //点击回调
                        state[index] = boolean
                    }
                )
                Text(text = list[index], modifier = Modifier.align(Alignment.CenterVertically))
            }
        }
    }
    //log检查是否被改动
    val str = StringBuilder().apply {
        state.onEach { append("$it、")}
    }
    Log.e("-----------",  str.toString())
}

单选框 RadioButton

@Preview(showBackground = true)
@Composable
fun Show() {
    val dataist = listOf("香菜", "酱油", "陈醋", "葱花", "蒜泥", "辣椒")
    Demo(dataist)
}

@Composable
fun Demo(list: List<String>) {
    //记录当前被点击的索引(默认值设为0默认选中第一个，设为-1默认都不选中)
    var selectedIndex by remember { mutableStateOf(-1) }
    //根据选项列表，创建相同数量的单选框
    Column {
        list.forEachIndexed { index, _ ->
            Row {
                RadioButton(
                    modifier = Modifier,
                    selected = selectedIndex == index,   //是否选中
                    enabled = true, //是否启用
                    colors = RadioButtonDefaults.colors(),
                    onClick = {
                        selectedIndex = index
                        Log.e("-----------",  "点击的是第${index}个${list[index]}")
                    }
                )
                Text(text = list[index], modifier = Modifier.align(Alignment.CenterVertically))
            }
        }
    }
}

开关 Switch

var state by remember { mutableStateOf(false) }
Switch(
    checked = state,    //控制开关
    onCheckedChange = { boolean ->  //点击事件
        state = boolean  //当进行切换操作时，更改状态
    },
    modifier = Modifier,
    thumbContent = null,
    enabled = true, //禁用（视觉和事件）
    colors = SwitchDefaults.colors(),   //不同状态下使用的颜色
//        interactionSource //可自定义不同状态下的外观和行为
)