fix(Android,Paper): header config blocks gestures close to the top of the screen

android/src/fabric/java/com/swmansion/rnscreens/FabricEnabledHeaderConfigViewGroup.kt

@@ -23,24 +23,19 @@ abstract class FabricEnabledHeaderConfigViewGroup(
         mStateWrapper = wrapper
     }
 
-    fun updatePaddings(
-        paddingStart: Int,
-        paddingEnd: Int,
-    ) {
-        // Do nothing on Fabric. This method is used only on Paper.
-    }
-
     fun updateHeaderConfigState(
         width: Int,
         height: Int,
         paddingStart: Int,
         paddingEnd: Int,
     ) {
+        // Implementation of this method differs between Fabric & Paper!
         updateState(width, height, paddingStart, paddingEnd)
     }
 
+    // Implementation of this method differs between Fabric & Paper!
     @UiThread
-    fun updateState(
+    private fun updateState(
         width: Int,
         height: Int,
         paddingStart: Int,

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

@@ -124,16 +124,13 @@ class ScreenStackHeaderConfig(
 
         val contentInsetEnd = toolbar.currentContentInsetEnd + toolbar.paddingEnd
 
-        if (BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
-            updateHeaderConfigState(
-                toolbar.width,
-                toolbar.height,
-                contentInsetStart,
-                contentInsetEnd,
-            )
-        } else {
-            updatePaddings(contentInsetStart, contentInsetEnd)
-        }
+        // Note that implementation of the callee differs between architectures.
+        updateHeaderConfigState(
+            toolbar.width,
+            toolbar.height,
+            contentInsetStart,
+            contentInsetEnd,
+        )
     }
 
     override fun onLayout(

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

@@ -10,14 +10,17 @@ internal class ScreenStackHeaderConfigShadowNode(
 ) : LayoutShadowNode() {
     var paddingStart: Float = 0f
     var paddingEnd: Float = 0f
+    var height: Float = 0f
 
     override fun setLocalData(data: Any?) {
         if (data is PaddingBundle) {
             paddingStart = data.paddingStart
             paddingEnd = data.paddingEnd
+            height = data.height
 
             setPadding(Spacing.START, paddingStart)
             setPadding(Spacing.END, paddingEnd)
+            setPosition(Spacing.TOP, -height)
         } else {
             super.setLocalData(data)
         }

android/src/main/java/com/swmansion/rnscreens/utils/PaddingBundle.kt

@@ -3,6 +3,7 @@ package com.swmansion.rnscreens.utils
 // Used only on Paper together with `setLocalData` mechanism to pass
 // the information on header paddings to shadow node.
 data class PaddingBundle(
+    val height: Float,
     val paddingStart: Float,
     val paddingEnd: Float,
 )

android/src/paper/java/com/swmansion/rnscreens/FabricEnabledHeaderConfigViewGroup.kt

@@ -2,6 +2,7 @@ package com.swmansion.rnscreens
 
 import android.content.Context
 import android.view.ViewGroup
+import androidx.annotation.UiThread
 import com.facebook.react.bridge.ReactContext
 import com.facebook.react.uimanager.StateWrapper
 import com.facebook.react.uimanager.UIManagerModule
@@ -13,32 +14,40 @@ abstract class FabricEnabledHeaderConfigViewGroup(
 ) : ViewGroup(context) {
     private var lastPaddingStart = 0
     private var lastPaddingEnd = 0
+    private var lastHeight = 0
 
     fun setStateWrapper(wrapper: StateWrapper?) = Unit
 
-    // Do nothing on Paper. This method is used only on Fabric.
     fun updateHeaderConfigState(
         width: Int,
         height: Int,
         paddingStart: Int,
         paddingEnd: Int,
-    ) = Unit
+    ) {
+      // Implementation of this method differs between Fabric & Paper!
+      updateState(width, height, paddingStart, paddingEnd)
+    }
 
-    fun updatePaddings(
+    // Implementation of this method differs between Fabric & Paper!
+    @UiThread
+    private fun updateState(
+        width: Int,
+        height: Int,
         paddingStart: Int,
         paddingEnd: Int,
     ) {
         // Note that on Paper we do not convert these props from px to dip. This is done internally by RN.
-        if (abs(lastPaddingStart - paddingStart) < DELTA && abs(lastPaddingEnd - paddingEnd) < DELTA) {
+        if (abs(lastPaddingStart - paddingStart) < DELTA && abs(lastPaddingEnd - paddingEnd) < DELTA && abs(lastHeight - height) < DELTA) {
             return
         }
 
         lastPaddingStart = paddingStart
         lastPaddingEnd = paddingEnd
+        lastHeight = height
 
         val reactContext = context as? ReactContext
         val uiManagerModule = reactContext?.getNativeModule(UIManagerModule::class.java)
-        uiManagerModule?.setViewLocalData(this.id, PaddingBundle(paddingStart.toFloat(), paddingEnd.toFloat()))
+        uiManagerModule?.setViewLocalData(this.id, PaddingBundle(height.toFloat(), paddingStart.toFloat(), paddingEnd.toFloat()))
     }
 
     companion object {