feat(Android): make fitToContents sheet height react to dynamic content

android/src/main/java/com/swmansion/rnscreens/Screen.kt

@@ -134,16 +134,21 @@ class Screen(
 
         if (usesFormSheetPresentation()) {
             if (isSheetFitToContents()) {
-                sheetBehavior?.useSingleDetent(height)
+                sheetBehavior?.useSingleDetent(height, screen = this)
             }
 
             if (!BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
                 // On old architecture we delay enter transition in order to wait for initial frame.
                 shouldTriggerPostponedTransitionAfterLayout = true
+            }
+
+            println("onContentWrapperLayout $height, ${sheetBehavior?.maxHeight}, ${sheetBehavior?.peekHeight}")
+            if (height > (sheetBehavior?.peekHeight ?: Int.MAX_VALUE)) {
                 val parent = parentAsViewGroup()
                 if (parent != null && !parent.isInLayout) {
                     // There are reported cases (irreproducible) when Screen is not laid out after
                     // maxHeight is set on behaviour.
+                    println("request")
                     parent.requestLayout()
                 }
             }
@@ -200,6 +205,11 @@ class Screen(
             // glitchy. *This seems to not be needed on Fabric*.
             triggerPostponedEnterTransitionIfNeeded()
         }
+        println("onBottomSheetBehaviorDidLayout $height, ${sheetBehavior?.maxHeight}, ${sheetBehavior?.peekHeight}")
+        if (sheetBehavior!!.peekHeight < sheetBehavior!!.maxHeight) {
+            sheetBehavior?.setPeekHeight(height, true)
+        }
+        sheetBehavior?.isDraggable = true
     }
 
     private fun triggerPostponedEnterTransitionIfNeeded() {

android/src/main/java/com/swmansion/rnscreens/bottomsheet/BottomSheetBehaviorExt.kt

@@ -2,18 +2,53 @@ package com.swmansion.rnscreens.bottomsheet
 
 import android.view.View
 import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.bottomsheet.BottomSheetBehavior.BottomSheetCallback
+import com.swmansion.rnscreens.Screen
+import com.swmansion.rnscreens.ext.parentAsViewGroup
+import kotlin.math.max
 
 internal fun <T : View> BottomSheetBehavior<T>.useSingleDetent(
     height: Int? = null,
     forceExpandedState: Boolean = true,
+    screen: Screen? = null
 ): BottomSheetBehavior<T> {
-    this.skipCollapsed = true
+    this.skipCollapsed = false
     this.isFitToContents = true
     if (forceExpandedState) {
-        this.state = BottomSheetBehavior.STATE_EXPANDED
+        this.state = BottomSheetBehavior.STATE_COLLAPSED
     }
+    isDraggable = false
+    println("useSingleDetent $height $maxHeight $peekHeight")
     height?.let {
-        maxHeight = height
+        this.state = BottomSheetBehavior.STATE_COLLAPSED
+        if (height > maxHeight) {
+            maxHeight = height
+        } else if (height < maxHeight) {
+            println("height <= maxHeight, adding callback")
+            addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
+                override fun onStateChanged(bottomSheet: View, newState: Int) {
+                    println(newState)
+                    if (newState == BottomSheetBehavior.STATE_COLLAPSED) {
+                        removeBottomSheetCallback(this)
+                        maxHeight = height
+                        screen?.apply {
+                            val parent = parentAsViewGroup()
+                            if (parent != null && !parent.isInLayout) {
+                                // There are reported cases (irreproducible) when Screen is not laid out after
+                                // maxHeight is set on behaviour.
+                                println("request inner")
+                                parent.requestLayout()
+                            }
+                        }
+                    }
+                }
+
+                override fun onSlide(bottomSheet: View, slideOffset: Float) {
+                }
+
+            })
+            setPeekHeight(height, true)
+        }
     }
     return this
 }

android/src/main/java/com/swmansion/rnscreens/bottomsheet/SheetUtils.kt

@@ -85,7 +85,7 @@ object SheetUtils {
             1 ->
                 when (state) {
                     STATE_HIDDEN -> -1
-                    STATE_EXPANDED -> 0
+                    STATE_COLLAPSED, STATE_EXPANDED -> 0
                     else -> throw IllegalArgumentException("[RNScreens] Invalid state $state for detentCount $detentCount")
                 }