Scaffold Remote Component

Development

Scaffold a new RemoteCompose wear material3 component with test, sample, and preview

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Source SKILL.md: https://github.com/androidx/androidx/blob/HEAD/wear/compose/remote/remote-material3/.agents/skills/scaffold-remote-component/SKILL.md

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Scaffold Remote Component

This skill scaffolds a new RemoteCompose Wear Material 3 component, automatically generating the required boilerplate for the component implementation, sample, preview, and screenshot tests.

Since this skill is located within remote-material3, it is specifically scoped to generate components only for this module.

Required Input

Ensure you know the name of the new component (e.g., RemoteSlider). If the user hasn't specified one, ask for it before proceeding. Let this be $COMPONENT_NAME.

Key Architectural Rules to Remember:

Descriptive Naming: Names of preview or test variants must describe what they have (e.g. ${COMPONENT_NAME}WithTitleSubtitle) rather than negating what they omit (e.g. ${COMPONENT_NAME}NoTime).
Separate Composables: Distinct preview states must be broken out into separated top-level @Composable functions, rather than cramming multiple variations into a single RemoteColumn under one State() method.
Component Testing: Tests must directly invoke the explicit *Preview / state composables defined in the preview file, rather than generically calling Sample files.
onClick Parameters: Use Action.Empty to mock any dummy onClick actions in samples, previews, and tests.

Step 1: Create Component Implementation

Create the file at relative to the root of the remote-material3 project: src/main/java/androidx/wear/compose/remote/material3/$COMPONENT_NAME.kt

Use this base template:

package androidx.wear.compose.remote.material3

import androidx.compose.runtime.Composable
import androidx.compose.remote.creation.compose.modifier.RemoteModifier

@Composable
public fun $COMPONENT_NAME(
    modifier: RemoteModifier = RemoteModifier,
    // Add other relevant parameters here
) {
    // TODO: Implement the component
}

Step 2: Create the Sample

Create the sample file relative to the root of the remote-material3 project: samples/src/main/java/androidx/wear/compose/remote/material3/samples/${COMPONENT_NAME}Sample.kt

Use this base template:

package androidx.wear.compose.remote.material3.samples

import androidx.annotation.Sampled
import androidx.compose.runtime.Composable
import androidx.compose.remote.creation.compose.modifier.RemoteModifier
import androidx.compose.ui.tooling.preview.PreviewWrapper
import androidx.wear.compose.remote.material3.$COMPONENT_NAME
import androidx.wear.compose.remote.material3.previews.utils.RemoteComponentPreviewWrapper
import androidx.wear.compose.ui.tooling.preview.WearPreviewDevices

@Sampled
@Composable
@WearPreviewDevices
@PreviewWrapper(RemoteComponentPreviewWrapper::class)
fun ${COMPONENT_NAME}Sample(modifier: RemoteModifier = RemoteModifier) {
    $COMPONENT_NAME(
        modifier = modifier
    )
}

Step 3: Create the Preview

Create the preview file relative to the root of the remote-material3 project: samples/src/main/java/androidx/wear/compose/remote/material3/previews/${COMPONENT_NAME}Preview.kt

Use this base template, separating out components into clear descriptive variations describing what they contain.

package androidx.wear.compose.remote.material3.previews

import androidx.compose.runtime.Composable
import androidx.compose.ui.tooling.preview.PreviewParameter
import androidx.wear.compose.material3.ui.util.WearPreviewDevices
import androidx.wear.compose.remote.material3.${COMPONENT_NAME}
import androidx.compose.remote.creation.compose.preview.RemotePreview
import androidx.compose.remote.creation.compose.preview.Profile
import androidx.compose.remote.creation.compose.preview.ProfilePreviewParameterProvider

@WearPreviewDevices
@Composable
fun ${COMPONENT_NAME}DefaultPreview(
    @PreviewParameter(ProfilePreviewParameterProvider::class) profile: Profile
) = RemotePreview(profile = profile) { Container { ${COMPONENT_NAME}Default() } }

@WearPreviewDevices
@Composable
fun ${COMPONENT_NAME}WithVariantPreview(
    @PreviewParameter(ProfilePreviewParameterProvider::class) profile: Profile
) = RemotePreview(profile = profile) { Container { ${COMPONENT_NAME}WithVariant() } }

@Composable
@RemoteComposable
fun ${COMPONENT_NAME}Default() {
    ${COMPONENT_NAME}()
}

@Composable
@RemoteComposable
fun ${COMPONENT_NAME}WithVariant() {
    ${COMPONENT_NAME}(/* Configure explicitly */)
}

@Composable
@RemoteComposable
private fun Container(
    modifier: RemoteModifier = RemoteModifier.fillMaxSize().padding(16.rdp),
    content: @Composable @RemoteComposable () -> Unit,
) {
    RemoteBox(modifier, contentAlignment = RemoteAlignment.Center, content = content)
}

Step 4: Create the Screenshot Test

Create the test file relative to the root of the remote-material3 project: src/androidTest/java/androidx/wear/compose/remote/material3/$COMPONENT_NAMETest.kt

Use this boilerplate, ensuring a separate @Test method exists for each explicit preview variation you generated in Step 3:

package androidx.wear.compose.remote.material3

import androidx.compose.remote.creation.compose.capture.createCreationDisplayInfo
import androidx.compose.remote.creation.profile.RcPlatformProfiles
import androidx.compose.remote.player.compose.test.utils.screenshot.rule.RemoteScreenshotTestRule
import androidx.compose.ui.geometry.Size
import androidx.test.core.app.ApplicationProvider
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.MediumTest
import androidx.test.filters.SdkSuppress
import androidx.wear.compose.remote.material3.previews.${COMPONENT_NAME}Default
import androidx.wear.compose.remote.material3.previews.${COMPONENT_NAME}WithVariant
import androidx.wear.compose.remote.material3.util.SCREENSHOT_GOLDEN_DIRECTORY
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith

@MediumTest
@SdkSuppress(minSdkVersion = 35, maxSdkVersion = 35)
@RunWith(AndroidJUnit4::class)
class ${COMPONENT_NAME}Test {
    @get:Rule
    val remoteComposeTestRule =
        RemoteScreenshotTestRule(
            moduleDirectory = SCREENSHOT_GOLDEN_DIRECTORY,
            context = ApplicationProvider.getApplicationContext(),
        )

    private val creationDisplayInfo =
        createCreationDisplayInfo(ApplicationProvider.getApplicationContext(), Size(500f, 500f))

    @Test
    fun ${COMPONENT_NAME}Default() {
        remoteComposeTestRule.runScreenshotTest(
            profile = RcPlatformProfiles.WEAR_WIDGETS,
            remoteCreationDisplayInfo = creationDisplayInfo,
        ) {
            ${COMPONENT_NAME}Default()
        }
    }

    @Test
    fun ${COMPONENT_NAME}WithVariant() {
        remoteComposeTestRule.runScreenshotTest(
            profile = RcPlatformProfiles.WEAR_WIDGETS,
            remoteCreationDisplayInfo = creationDisplayInfo,
        ) {
            ${COMPONENT_NAME}WithVariant()
        }
    }
}

Step 5: Create the Screenshot Test for Sample

Create screenshot test for the sample at: src/androidTest/java/androidx/wear/compose/remote/material3/samples/

Use this boilerplate:

package androidx.wear.compose.remote.material3.samples

import androidx.compose.remote.creation.compose.capture.createCreationDisplayInfo
import androidx.compose.remote.creation.profile.RcPlatformProfiles
import androidx.compose.remote.player.compose.test.utils.screenshot.rule.RemoteScreenshotTestRule
import androidx.compose.runtime.Composable
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.test.core.app.ApplicationProvider
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.MediumTest
import androidx.test.filters.SdkSuppress
import androidx.wear.compose.remote.material3.util.SCREENSHOT_GOLDEN_DIRECTORY
import androidx.wear.compose.remote.material3.samples.${COMPONENT_NAME}Sample
import androidx.wear.compose.remote.material3.util.ComponentContainer
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith

@MediumTest
@SdkSuppress(minSdkVersion = 35, maxSdkVersion = 35)
@RunWith(AndroidJUnit4::class)
class ${COMPONENT_NAME}SampleTest {
    @get:Rule
    val remoteComposeTestRule =
        RemoteScreenshotTestRule(
            moduleDirectory = SCREENSHOT_GOLDEN_DIRECTORY,
            context = ApplicationProvider.getApplicationContext(),
        )

    private val creationDisplayInfo =
        createCreationDisplayInfo(ApplicationProvider.getApplicationContext(), Size(500f, 500f))

    @Test
    fun ${COMPONENT_NAME}SampleTest() {
        remoteComposeTestRule.runScreenshotTest(
            profile = RcPlatformProfiles.WEAR_WIDGETS,
            remoteCreationDisplayInfo = creationDisplayInfo,
        ) {
            ComponentContainer { ${COMPONENT_NAME}Sample() }
        }
    }
}

Step 6: Wrap up

Notify the user that the component boilerplate has been generated and ask if they'd like to implement specific behavior for the $COMPONENT_NAME component now.

Other versions

Version 2 on GitHub