Add box data to native android

Summary:
This powers the UIDebuggers box visualiser.

The android box model doesnt include padding so its just 0

Reviewed By: lblasa

Differential Revision: D53812666

fbshipit-source-id: 802c85ac5cbac9e0258433878205b8332489364c

android/src/main/java/com/facebook/flipper/plugins/uidebugger/descriptors/ChainedDescriptor.kt

@@ -9,6 +9,7 @@ package com.facebook.flipper.plugins.uidebugger.descriptors
 
 import com.facebook.flipper.core.FlipperDynamic
 import com.facebook.flipper.plugins.uidebugger.model.Bounds
+import com.facebook.flipper.plugins.uidebugger.model.BoxData
 import com.facebook.flipper.plugins.uidebugger.model.InspectableObject
 import com.facebook.flipper.plugins.uidebugger.model.Metadata
 import com.facebook.flipper.plugins.uidebugger.model.MetadataId
@@ -42,6 +43,10 @@ abstract class ChainedDescriptor<T> : NodeDescriptor<T> {
  return mSuper
  }
 
+ final override fun getBoxData(node: T): BoxData? = onGetBoxData(node) ?: mSuper?.getBoxData(node)
+
+ open fun onGetBoxData(node: T): BoxData? = null
+
  final override fun getActiveChild(node: T): Any? {
  // ask each descriptor in the chain for an active child, if none available look up the chain
  // until no more super descriptors

android/src/main/java/com/facebook/flipper/plugins/uidebugger/descriptors/ViewDescriptor.kt

@@ -527,6 +527,33 @@ object ViewDescriptor : ChainedDescriptor<View>() {
  }
  }
 
+ private val emptyBox = listOf(0f, 0f, 0f, 0f)
+
+ override fun onGetBoxData(node: View): BoxData {
+
+ val layoutParams = node.layoutParams
+ val margin =
+ if (layoutParams is ViewGroup.MarginLayoutParams) {
+ listOf(
+ layoutParams.topMargin.toFloat(),
+ layoutParams.rightMargin.toFloat(),
+ layoutParams.bottomMargin.toFloat(),
+ layoutParams.leftMargin.toFloat())
+ } else {
+ emptyBox
+ }
+
+ val padding =
+ listOf<Float>(
+ node.paddingLeft.toFloat(),
+ node.paddingRight.toFloat(),
+ node.paddingTop.toFloat(),
+ node.paddingBottom.toFloat(),
+ )
+
+ return BoxData(margin, emptyBox, padding)
+ }
+
  override fun onGetInlineAttributes(node: View, attributes: MutableMap<String, String>) {
  val id = node.id
  if (id == View.NO_ID) {