field/me.tbsten.compose.preview.lab.field/WithHintField

WithHintField

class WithHintField<Value> : TransformField<Value, Value>

A field wrapper that adds hint choices below the base field. Users can click on hint chips to quickly apply predefined values or execute actions.

Usage

// Adding hints to number fields (like font sizes)
@Preview
@Composable
fun FontSizePreview() = PreviewLab {
    val lineHeight: Int = fieldValue {
        IntField(label = "Line Height", initialValue = 24)
            .withHint(
                "Compact" to 18,
                "Normal" to 24,
                "Relaxed" to 32
            )
    }
    Text("Multi-line text example", lineHeight = lineHeight.sp)
}

// Adding action hints for custom operations
@Preview
@Composable
fun ListPreview() = PreviewLab {
    val items: List<String> = fieldValue {
        ListField(
            label = "items",
            elementField = { StringField(label, initialValue) },
            initialValue = emptyList(),
        )
            .withHintAction(
                "Add 3 items" to { value = value + listOf("Item A", "Item B", "Item C") },
                "Clear" to { value = emptyList() }
            )
    }
    ItemList(items = items)
}

Parameters

Value

The type of value managed by the field

baseField

The underlying field to wrap with hints

choices

Map of hint labels to their corresponding HintChoice (value or action)

Properties

coroutineScope

open override val coroutineScope: CoroutineScope

initialValue

open override val initialValue: Value

Default value for this field.

label

open override var label: String

The label for this field. This is not used in any of the program logic, but only for display purposes, so it is best to set it in a language that is easy for your team members to read.

value

open override var value: Value

Current value of this PreviewLabField.

valueFlow

open override val valueFlow: Flow<Value>

Functions

component1

open operator override fun component1(): Value

component2

open operator override fun component2(): (Value) -> Unit

Content

@Composable

open override fun Content()

Composable, which displays the main UI for this Field. If you want to customize the UI, you can override this method in your PreviewLabField to customize the UI.

DefaultFieldView

@Composable

fun <Value> PreviewLabField<Value>.DefaultFieldView(modifier: Modifier = Modifier, menuItems: List<PreviewLabField.ViewMenuItem<Value>> = ViewMenuItem.defaults<Value>(this), content: @Composable () -> Unit = { Content() })

Default UI implementation of me.tbsten.compose.preview.lab.PreviewLabField.View. Display a label and draw the content below it.

FieldLabelHeader

@Composable

fun <Value> PreviewLabField<Value>.FieldLabelHeader(menuItems: List<PreviewLabField.ViewMenuItem<Value>> = ViewMenuItem.defaults<Value>(this))

Display the label of PreviewLabField.

nullable

fun <Value : Any> PreviewLabField<Value>.nullable(initialValue: Value? = this.initialValue): NullableField<Value>

Create a PreviewLabField that makes the receiver's PreviewLabField nullable.

onCleared

open fun onCleared()

serializer

open override fun serializer(): KSerializer<Value>?

Returns a KSerializer for this field's value type, or null if serialization is not supported.

testValues

open override fun testValues(): List<Value>

Returns a list of representative values for this field to be used in automated testing.

TextFieldContent

@Composable

fun <Value> MutablePreviewLabField<Value>.TextFieldContent(toString: (Value) -> String, toValue: (String) -> Result<Value>, modifier: Modifier = Modifier, prefix: @Composable () -> Unit? = null, suffix: @Composable () -> Unit? = null, placeholder: @Composable () -> Unit? = null)

Helper for UI of Fields that can be input with TextField.

transform

fun <BaseValue, TransformedValue> MutablePreviewLabField<BaseValue>.transform(transform: (BaseValue) -> TransformedValue, reverse: (TransformedValue) -> BaseValue, label: String = this.label, initialValue: TransformedValue = transform(this.value)): TransformField<BaseValue, TransformedValue>

Transforms a MutablePreviewLabField to work with a different value type.

valueCode

open override fun valueCode(): String

Returns a Kotlin code string representing the current value of this field.

View

@Composable

open fun View(menuItems: List<PreviewLabField.ViewMenuItem<Value>>)

Composable, which displays the entire UI for this Field. If you want to customize the UI, you can override this method in your PreviewLabField to customize the UI. However, in many cases where the UI is customized, overriding the content method is more appropriate.

withDecrementHint