Hidden attributes

Summary:
These are attributes that are:
1.  Not common across frameworks
2. Not in every node
3. Will not be visualised via inspectable attribute mechansism

Currently we will use them for bloks but they should be useful for other features down the road

Reviewed By: lblasa

Differential Revision: D45048025

fbshipit-source-id: c258d0a384a2b09abb642778e68da178899fa9eb

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

@@ -12,6 +12,7 @@ import com.facebook.flipper.plugins.uidebugger.model.Bounds
 import com.facebook.flipper.plugins.uidebugger.model.InspectableObject
 import com.facebook.flipper.plugins.uidebugger.model.MetadataId
 import com.facebook.flipper.plugins.uidebugger.util.MaybeDeferred
+import kotlinx.serialization.json.JsonObject
 
 /*
  Descriptors are an extension point used during traversal to extract data out of arbitrary
@@ -62,7 +63,7 @@ interface NodeDescriptor<T> {
    * parameter. If a bitmap is provided, it will be used by the canvas to draw on it. Otherwise, a
    * bitmap will be created.
    */
-  fun getSnapshot(node: T, bitmap: Bitmap?): Bitmap?
+  fun getSnapshot(node: T, bitmap: Bitmap?): Bitmap? = null
 
   /**
    * If you have overlapping children this indicates which child is active / on top, we will only
@@ -86,5 +87,7 @@ interface NodeDescriptor<T> {
   /**
    * These are shown inline in the tree view on the desktop, will likely be removed in the future
    */
-  fun getInlineAttributes(node: T): Map<String, String> = mutableMapOf()
+  fun getInlineAttributes(node: T): Map<String, String> = mapOf()
+
+  fun getHiddenAttributes(node: T): JsonObject? = null
 }

android/src/main/java/com/facebook/flipper/plugins/uidebugger/model/Node.kt

@@ -8,6 +8,7 @@
 package com.facebook.flipper.plugins.uidebugger.model
 
 import com.facebook.flipper.plugins.uidebugger.descriptors.Id
+import kotlinx.serialization.json.JsonObject
 
 @kotlinx.serialization.Serializable
 data class Node(
@@ -17,6 +18,7 @@ data class Node(
     val name: String,
     val attributes: Map<MetadataId, InspectableObject>,
     val inlineAttributes: Map<String, String>,
+    val hiddenAttributes: JsonObject?,
     val bounds: Bounds,
     val tags: Set<String>,
     val children: List<Id>,

android/src/main/java/com/facebook/flipper/plugins/uidebugger/traversal/PartialLayoutTraversal.kt

@@ -65,6 +65,7 @@ class PartialLayoutTraversal(
                       descriptor.getName(node),
                       emptyMap(),
                       emptyMap(),
+                      null,
                       descriptor.getBounds(node),
                       emptySet(),
                       emptyList(),
@@ -108,6 +109,7 @@ class PartialLayoutTraversal(
                   descriptor.getName(node),
                   attrs,
                   descriptor.getInlineAttributes(node),
+                  descriptor.getHiddenAttributes(node),
                   bounds,
                   tags,
                   childrenIds,