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[Compose] Add initialModel() API to view factory. #407

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Jan 17, 2025
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[Compose] Add initialModel() API to view factory. #407

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12 changes: 7 additions & 5 deletions ...android-compose/src/main/java/com/instacart/formula/android/compose/ComposeViewFactory.kt
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Original file line number Diff line number Diff line change
@@ -1,7 +1,5 @@
package com.instacart.formula.android.compose

import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.compose.runtime.Composable
import androidx.compose.runtime.rxjava3.subscribeAsState
import androidx.compose.ui.platform.ComposeView
Expand All @@ -10,17 +8,17 @@ import com.instacart.formula.android.FeatureView
import com.instacart.formula.android.ViewFactory
import com.jakewharton.rxrelay3.BehaviorRelay


abstract class ComposeViewFactory<RenderModel : Any> : ViewFactory<RenderModel> {

override fun create(params: ViewFactory.Params): FeatureView<RenderModel> {
final override fun create(params: ViewFactory.Params): FeatureView<RenderModel> {
val view = ComposeView(params.context)
// Based-on: https://developer.android.com/develop/ui/compose/migrate/interoperability-apis/compose-in-views#compose-in-fragments
view.setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)

val outputRelay = BehaviorRelay.create<RenderModel>()
val initialModel = initialModel()
view.setContent {
val model = outputRelay.subscribeAsState(null).value
val model = outputRelay.subscribeAsState(initialModel).value
if (model != null) {
Content(model)
}
Expand All @@ -32,6 +30,10 @@ abstract class ComposeViewFactory<RenderModel : Any> : ViewFactory<RenderModel>
)
}

open fun initialModel(): RenderModel? {
return null
}

@Composable
abstract fun Content(model: RenderModel)
}
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