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@stewemetal Composing a Design System πŸ‘¨πŸ’» Senior Android Engineer @ TIER 
 οΏΌ Co-organizer of Kotlin Budapest 
 🌐 istvanjuhos.dev IstvΓ‘n Juhos

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@stewemetal @akoskovacsme

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@stewemetal @akoskovacsme

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@stewemetal Octopus Design System - B.C. ● Customised Android Views and ViewGroups ● Data Binding and @BindingAdapters ● Lots of XML files and custom XML attributes

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@stewemetal Octopus Design System - B.C. ● Customised Android Views and ViewGroups ● Data Binding and @BindingAdapters ● Lots of XML files and custom XML attributes OctopusButtonPrimary.kt R.layout.__internal_view_octopus_button R.styleable.OctopusButton R.drawable.__internal_octopus_button_background_primary ... @stewemetal

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@stewemetal Octopus Design System - B.C. ● Customised Android Views and ViewGroups ● Data Binding and @BindingAdapters ● Lots of XML files and custom XML attributes class OctopusText @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0, ) : AppCompatTextView(context, attrs, defStyleAttr) @stewemetal

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@stewemetal Octopus Design System - B.C. ● Customised Android Views and ViewGroups ● Data Binding and @BindingAdapters ● Lots of XML files and custom XML attributes class OctopusText @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0, ) : AppCompatTextView(context, attrs, defStyleAttr) @stewemetal

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@stewemetal Octopus Design System - B.C. private fun updateStyle() { areSettersEnabled = true ... setTextColor(ContextCompat.getColor(context, colorFromTextType)) ... areSettersEnabled = false } OctopusText : AppCompatTextView // We have to disable specific setters to prevent misuse of the view private var areSettersEnabled = false

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@stewemetal Octopus Design System - B.C. /** * Calling this method will have no effect. */ override fun setTextColor(color: Int) { if (areSettersEnabled || isInEditMode) { super.setTextColor(color) } } OctopusText : AppCompatTextView // We have to disable specific setters to prevent misuse of the view private var areSettersEnabled = false

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@stewemetal Adopting Compose 
 πŸ€”

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@stewemetal Adopting Compose ● Possible approaches to consider @marcoGomier @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider Views + AndroidView @Composable fun OctopusButtonPrimary( text: String, ... onClick: () -> Unit, ) { AndroidView( factory = { context -> OctopusButtonPrimary( ContextThemeWrapper( context, R.style.Theme_Octopus, ) ) }, update = { view -> ... }, ) } @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider Views + AndroidView @Composable fun OctopusButtonPrimary( text: String, ... onClick: () -> Unit, ) { AndroidView( factory = { context -> OctopusButtonPrimary( ContextThemeWrapper( context, R.style.Theme_Octopus, ) ) }, update = { view -> ... }, ) } @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider Views + AndroidView @Composable fun OctopusButtonPrimary( text: String, ... onClick: () -> Unit, ) { AndroidView( factory = { context -> OctopusButtonPrimary( ContextThemeWrapper( context, R.style.Theme_Octopus, ) ).apply { setText(text) setOnClickListener { onClick() } ... } }, update = { view -> @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider Views + AndroidView + XMLs @Composable fun OctopusButtonPrimary( text: String, ... onClick: () -> Unit, ) { AndroidView( factory = { context -> OctopusButtonPrimary( ContextThemeWrapper( context, R.style.Theme_Octopus, ) ).apply { setText(text) setOnClickListener { onClick() } ... } }, update = { view -> @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider @Composable fun OctopusButtonPrimary( text: String, ... onClick: () -> Unit, ) { AndroidView( factory = { context -> OctopusButtonPrimary( ContextThemeWrapper( context, R.style.Theme_Octopus, ) ).apply { setText(text) setOnClickListener { onClick() } ... } }, update = { view -> @stewemetal Views + AndroidView + XMLs

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@stewemetal Adopting Compose ● Possible approaches to consider @Composable public fun OctopusButtonPrimary( text: String, modifier: Modifier = Modifier, buttonSize: ButtonSize = NORMAL, enabled: Boolean = true, loading: Boolean = false, destructive: Boolean = false, onClick: () -> Unit, ) { Box() { Button(…) { Text(text) } if (loading) { OctopusButtonLoader() } } } Reimplement component s​ in ​ Compose @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider @Composable public fun OctopusButtonPrimary( text: String, modifier: Modifier = Modifier, buttonSize: ButtonSize = NORMAL, enabled: Boolean = true, loading: Boolean = false, destructive: Boolean = false, onClick: () -> Unit, ) { Box() { Button(…) { Text(text) } if (loading) { OctopusButtonLoader() } } } Reimplement component s​ in ​ Compose @stewemetal

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@stewemetal Adopting Compose ● Possible approaches to consider Reimplement component s​ in ​ Compose @stewemetal @Composable public fun OctopusButtonPrimary( text: String, modifier: Modifier = Modifier, buttonSize: ButtonSize = NORMAL, enabled: Boolean = true, loading: Boolean = false, destructive: Boolean = false, onClick: () -> Unit, ) { Box() { Button(…) { Text(text) } if (loading) { OctopusButtonLoader() } } }

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@stewemetal Adopting Compose ● Possible approaches to consider Reimplement component s​ in ​ Compose @stewemetal @Composable public fun OctopusButtonPrimary( text: String, modifier: Modifier = Modifier, buttonSize: ButtonSize = NORMAL, enabled: Boolean = true, loading: Boolean = false, destructive: Boolean = false, onClick: () -> Unit, ) { Box() { Button(…) { Text(text) } if (loading) { OctopusButtonLoader() } } }

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@stewemetal ● The benefits of recreating components in Compose ● Easier to maintain than custom Views ● No attachments to the legacy Views and tech debt ● Octopus is close to Material ● A new experience for our teams Adopting Compose 🀩

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@stewemetal ● Downsides of recreating components in Compose ● Lack of experience in Compose APIs ● A second implementation to maintain ● Parity with the View-based components Adopting Compose 🧐

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@stewemetal Adopting Compose

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@stewemetal Composing Octopus developer.android.com/jetpack/compose/designsystems

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@stewemetal Composing Octopus ● Three possible approaches (not just for the theme!) ● Customize Material ● Extend Material ● Go fully-custom

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@stewemetal Composing Octopus ● Three possible approaches (not just for the theme!) ● Customize Material ● Extend Material ● Go fully-custom

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@stewemetal Composing Octopus ● Three possible approaches (not just for the theme!) ● Customize Material ● Extend Material ● Go fully-custom - but use Material components where possible

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@stewemetal OctopusTheme

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@stewemetal OctopusTheme @Composable public fun OctopusTheme( isInDarkMode: Boolean = isSystemInDarkTheme(), 
 ... content: @Composable () -> Unit, ) { content() }

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@stewemetal @Composable public fun OctopusTheme( isInDarkMode: Boolean = isSystemInDarkTheme(), colors: OctopusColors = OctopusColors.build(isInDarkMode), typography: OctopusTypography = OctopusTypography.build(), shapes: OctopusShapes = OctopusShapes.build(), dimensions: OctopusDimensions = OctopusDimensions.build(), spacings: OctopusSpacings = OctopusSpacings(), content: @Composable () -> Unit, ) { content() } OctopusTheme

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@stewemetal @Composable public fun OctopusTheme( isInDarkMode: Boolean = isSystemInDarkTheme(), colors: OctopusColors = OctopusColors.build(isInDarkMode), ... content: @Composable () -> Unit, ) { CompositionLocalProvider( LocalColors provides colors, ... ) { content() } } OctopusTheme

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@stewemetal @Composable public fun OctopusTheme( isInDarkMode: Boolean = isSystemInDarkTheme(), colors: OctopusColors = OctopusColors.build(isInDarkMode), ... content: @Composable () -> Unit, ) { CompositionLocalProvider( LocalColors provides colors, ... ) { content() } } OctopusTheme

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@stewemetal private val LocalColors = compositionLocalOf { error( 
 "No colors provided! Make sure to wrap all Octopus components 
 in an OctopusTheme." 
 ) } OctopusTheme

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@stewemetal public object { public val : OctopusColors @Composable @ReadOnlyComposable get() = LocalColors.current ... } OctopusTheme colors OctopusTheme

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@stewemetal Modifier .background( color = . .semanticColors.backgroundPrimary, ) OctopusTheme colors OctopusTheme

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@stewemetal OctopusTheme developer.android.com/jetpack/compose/compositionlocal

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@stewemetal Composable Components

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@stewemetal Designing Components in Compose goo.gle/compose-api-guidelines

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@stewemetal ● Octopus Compose component implementations ● should follow the Jetpack Compose library API guidelines ● should look and feel like the View ones (DS specs βœ… ) ● should use values provided by OctopusTheme ● should be built on existing Material components, where viable Designing Components in Compose

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@stewemetal Component example - OctopusText @Composable public fun OctopusText( text: String, modifier: Modifier = Modifier, textType: TextType = BODY_1, links: List = emptyList(), textAlignment: Alignment = NATURAL, overflow: TextOverflow = TextOverflow.Clip, style: OctopusStyle = OctopusStyle.getDefault(), ) { ... }

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@stewemetal Component example - OctopusText @Composable public fun OctopusText( text: String, modifier: Modifier = Modifier, textType: TextType = BODY_1, links: List = emptyList(), textAlignment: Alignment = NATURAL, overflow: TextOverflow = TextOverflow.Clip, style: OctopusStyle = OctopusStyle.getDefault(), ) { ... }

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@stewemetal Component example - OctopusText @Composable public fun OctopusText( text: String, modifier: Modifier = Modifier, textType: TextType = BODY_1, links: List = emptyList(), textAlignment: Alignment = NATURAL, overflow: TextOverflow = TextOverflow.Clip, style: OctopusStyle = OctopusStyle.getDefault(), ) { ... }

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@stewemetal Configuration example - TextType enum class TextType( private val id: Int, @ColorRes public val textColorRes: Int, public val textSizeSp: Float, public val lineHeightSp: Float, public val isBold: Boolean = true, public val maxLines: Int = Int.MAX_VALUE, public val isAllCaps: Boolean = false, ) { TITLE_1(0, R.color.__internal_octopusTextTitleNormal, SIZE_TITLE_1, 
 LINE_HEIGHT_40, maxLines = 1), BODY_1(1, R.color.__internal_octopusTextBody, TEXT_SIZE_16, 
 LINE_HEIGHT_20, isBold = false), ... }

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@stewemetal TextType usage with Composables OctopusText( text = "Title 1 (Normal)", textType = TITLE_1, ) OctopusText( text = "Title 1 (Informative)", textType = TITLE_1_INFORMATIVE, ) OctopusText( text = "Title 1 (Destructive)", textType = TITLE_1_DESTRUCTIVE, ) ...

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@stewemetal TextType usage with Views

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@stewemetal TextType usage with Views

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@stewemetal ... ... πŸ˜΅πŸ’« TextType usage with Views

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@stewemetal Previews 🀩

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@stewemetal Previews ● At least light and dark variants ● Multi-preview 🐬

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@stewemetal Previews ● At least light and dark variants ● Multi-preview

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@stewemetal Previews @Preview( name = "1 - Light", showBackground = true, backgroundColor = 0xffffffff, // primaryBackgroundLight group = "Light/Dark", ) @Preview( name = "2 - Dark", showBackground = true, uiMode = UI_MODE_NIGHT_YES, backgroundColor = 0xff060a1e, // primaryBackgroundDark group = "Light/Dark", ) annotation class OctopusPreviewPrimaryBackground

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@stewemetal Previews @OctopusPreviewPrimaryBackground @Composable fun OctopusTextPreview() { Column( modifier = Modifier.verticalScroll(rememberScrollState()), ) { OctopusTextComposeDemo() } }

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@stewemetal Previews @OctopusPreviewPrimaryBackground @Composable fun OctopusTextPreview() { Column( modifier = Modifier.verticalScroll(rememberScrollState()), ) { OctopusTextComposeDemo() } }

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@stewemetal Previews @OctopusPreviewPrimaryBackground @Composable fun OctopusTextPreview() { Column( modifier = Modifier.verticalScroll(rememberScrollState()), ) { OctopusTextComposeDemo() } }

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@stewemetal Previews @OctopusPreviewPrimaryBackground @Composable fun OctopusTextPreview() { Column( modifier = Modifier.verticalScroll(rememberScrollState()), ) { OctopusTextComposeDemo() } }

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@stewemetal Previews @OctopusPreviewPrimaryBackground @Composable fun OctopusTextPreview() { Column( modifier = Modifier.verticalScroll(rememberScrollState()), ) { OctopusTextComposeDemo() } }

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@stewemetal Previews in the in-app Octopus demo @Composable fun OctopusTextComposeDemo() { OctopusTheme { Column(...) { OctopusComposeDemoSubSection( title = β€œTitles", ) { OctopusText( text = "Title 1 (Normal)", textType = TITLE_1, ) OctopusText( text = "Title 1 (Informative)", textType = TITLE_1_INFORMATIVE, ) OctopusText(

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@stewemetal Previews in the in-app Octopus demo @Composable fun OctopusTextComposeDemo() { OctopusTheme { Column(...) { OctopusComposeDemoSubSection( title = β€œTitles", ) { OctopusText( text = "Title 1 (Normal)", textType = TITLE_1, ) OctopusText( text = "Title 1 (Informative)", textType = TITLE_1_INFORMATIVE, ) OctopusText(

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@stewemetal Previews in the in-app Octopus demo ... ...

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@stewemetal Previews in the in-app Octopus demo ... ...

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@stewemetal Previews in the in-app Octopus demo ... ... ...

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@stewemetal Previews in the in-app Octopus demo findViewById(R.id.composeView)?.apply { setContent { OctopusTheme { OctopusComposeDemoSection { OctopusTextComposeDemo() } } } } ...

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@stewemetal Previews in the in-app Octopus demo findViewById(R.id.composeView)?.apply { setContent { OctopusTheme { OctopusComposeDemoSection { OctopusTextComposeDemo() } } } } ...

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@stewemetal In-app Octopus Demo

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@stewemetal In-app Octopus Demo

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@stewemetal Going Compose-first

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@stewemetal Going Compose-first ● Two separate Design System implementations πŸ‘Ž ● Duplicated presentation and behavior ● Keeping them in sync is tedious ● New components = twice the work 🫠

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@stewemetal Going Compose-first πŸ’‘

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@stewemetal Going Compose-first ● Use the Compose implementation of components to render the Views πŸ’‘

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@stewemetal Going Compose-first ● Use the Compose implementation of components to render the Views ● Compose-View interop πŸ’‘

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@stewemetal Going Compose-first ● Compose-View interop @stewemetal πŸ’‘

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@stewemetal Going Compose-first ● Compose-View interop @stewemetal πŸ’‘ findViewById(R.id.someView) .setContent { OctopusTheme { ... } }

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@stewemetal Going Compose-first @stewemetal class ComposeView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : AbstractComposeView( ... ) { private val content = mutableStateOf<(@Composable () -> Unit)?>(null) @Composable override fun Content() { content.value ?. invoke() } }

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@stewemetal Going Compose-first @stewemetal class ComposeView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : AbstractComposeView( ... ) { private val content = mutableStateOf<(@Composable () -> Unit)?>(null) @Composable override fun Content() { content.value ?. invoke() } }

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@stewemetal Going Compose-first @stewemetal class ComposeView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : AbstractComposeView( ... ) { private val content = mutableStateOf<(@Composable () -> Unit)?>(null) @Composable override fun Content() { content.value ?. invoke() } } πŸ€”

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@stewemetal Going Compose-first @stewemetal class ComposeView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : AbstractComposeView( ... ) { private val content = mutableStateOf<(@Composable () -> Unit)?>(null) @Composable override fun Content() { content.value ?. invoke() } } πŸ€”

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@stewemetal Going Compose-first ● AbstractComposeView

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@stewemetal View wrappers - base class abstract class OctopusComposeBaseView @JvmOverloads constructor( ... ) : AbstractComposeView(...) { ... }

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@stewemetal View wrappers - base class abstract class OctopusComposeBaseView @JvmOverloads constructor( ... ) : AbstractComposeView(...) { @get:StyleableRes protected open val styleables: IntArray = IntArray(0) ... }

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@stewemetal View wrappers - base class abstract class OctopusComposeBaseView() : AbstractComposeView(...) { @get:StyleableRes protected open val styleables: IntArray = IntArray(0) protected fun initView(attrs: AttributeSet?) { if (styleables.isNotEmpty()) { context.theme 
 .obtainStyledAttributes(attrs, styleables, 0, 0,) .apply { try { initAttributes(this) } finally { recycle() } } } } }

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@stewemetal View wrappers - base class abstract class OctopusComposeBaseView() : AbstractComposeView(...) { @get:StyleableRes protected open val styleables: IntArray = IntArray(0) protected fun initView(attrs: AttributeSet?) { ... } protected abstract fun initAttributes(typedArray: TypedArray) }

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@stewemetal Supporting custom properties

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@stewemetal Supporting custom properties

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@stewemetal Supporting custom properties

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { @StyleableRes override val styleables: IntArray = R.styleable.OctopusButton init { initView(attrs) } override fun initAttributes(typedArray: TypedArray) { with(typedArray) { text.value = getString(R.styleable.OctopusButton_text).orEmpty() isEnabled.value = getBoolean(R.styleable.OctopusButton_enabled, true) isDestructive.value = getBoolean(R.styleable.OctopusButton_destructive, false) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { @StyleableRes override val styleables: IntArray = R.styleable.OctopusButton init { initView(attrs) } override fun initAttributes(typedArray: TypedArray) { with(typedArray) { text.value = getString(R.styleable.OctopusButton_text).orEmpty() isEnabled.value = getBoolean(R.styleable.OctopusButton_enabled, true) isDestructive.value = getBoolean(R.styleable.OctopusButton_destructive, false) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { @StyleableRes override val styleables: IntArray = R.styleable.OctopusButton init { initView(attrs) } override fun initAttributes(typedArray: TypedArray) { with(typedArray) { text.value = getString(R.styleable.OctopusButton_text).orEmpty() isEnabled.value = getBoolean(R.styleable.OctopusButton_enabled, true) isDestructive.value = getBoolean(R.styleable.OctopusButton_destructive, false) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { @StyleableRes override val styleables: IntArray = R.styleable.OctopusButton init { initView(attrs) } override fun initAttributes(typedArray: TypedArray) { with(typedArray) { text.value = getString(R.styleable.OctopusButton_text).orEmpty() isEnabled.value = getBoolean(R.styleable.OctopusButton_enabled, true) isDestructive.value = getBoolean(R.styleable.OctopusButton_destructive, false) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { ... private val text = mutableStateOf("") private val isEnabled = mutableStateOf(true) private val isDestructive = mutableStateOf(false) override fun initAttributes(typedArray: TypedArray) { with(typedArray) { text.value = getString(R.styleable.OctopusButton_text).orEmpty() isEnabled.value = getBoolean(R.styleable.OctopusButton_enabled, true) isDestructive.value = getBoolean(R.styleable.OctopusButton_destructive, false) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { ... @Composable override fun Content() { OctopusTheme { OctopusButtonPrimaryCompose( text = text.value, enabled = isEnabled.value, destructive = isDestructive.value, ) } } }

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@stewemetal Supporting custom properties class OctopusButtonPrimary(...) : OctopusComposeBaseView(...) { ... @Composable override fun Content() { OctopusTheme { OctopusButtonPrimaryCompose( text = text.value, enabled = isEnabled.value, destructive = isDestructive.value, ) } } } import com.tier.octopus.compose.widget .button.OctopusButtonPrimary as OctopusButtonPrimaryCompose

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@stewemetal XML previews ⚠

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@stewemetal XML previews ⚠ Works out of the box after Android Studio Giraffe Canary 8 https://issuetracker.google.com/issues/187339385 ⚠

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@stewemetal Wrapping up

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@stewemetal Octopus is Compose-first

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@stewemetal

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@stewemetal Was it worth it?

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@stewemetal It dependsTM

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@stewemetal Conclusions ● Having a design system to convert to Compose is already a good position

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@stewemetal Conclusions ● Having a design system to convert to Compose is already a good position ● Choose a path that makes sense for your project and timeline

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@stewemetal Conclusions ● Having a design system to convert to Compose is already a good position ● Choose a path that makes sense for your project and timeline ● Consider interoperability with legacy Views

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@stewemetal Conclusions ● Having a design system to convert to Compose is already a good position ● Choose a path that makes sense for your project and timeline ● Consider interoperability with legacy Views ● Going Compose-first is a challenging journey

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@stewemetal Conclusions ● Having a design system to convert to Compose is already a good position ● Choose a path that makes sense for your project and timeline ● Consider interoperability with legacy Views ● Going Compose-first is a challenging journey ● Zero ➑ Hero takes time We’re still here πŸ˜„

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@stewemetal ● https://developer.android.com/jetpack/compose/designsystems ● https://adambennett.dev/2020/12/migrating-your-design-system-to-jetpack- compose-part-1/ ● https://www.droidcon.com/2022/06/28/custom-design-systems-in-compose/ ● https://github.com/androidx/androidx/blob/androidx-main/compose/docs/ compose-api-guidelines.md ● https://developer.android.com/jetpack/compose/compositionlocal ● https://developer.android.com/reference/kotlin/androidx/compose/ui/ platform/AbstractComposeView Resources

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@stewemetal Composing a Design System IstvΓ‘n Juhos πŸ‘¨πŸ’» Senior Android Engineer @ TIER 
 οΏΌ Co-organizer of Kotlin Budapest 
 Mastodon: androiddev.social/@stewemetal 
 Twitter: @stewemetal 
 Web: istvanjuhos.dev 
 Thank you! / DziΔ™kujΔ™!