Generalised mounted object and descriptor into offset child

Summary: There are other situations where we want to overide the offset than for litho mounted views

Reviewed By: lblasa

Differential Revision: D40021833

fbshipit-source-id: 1411a4a67e88f6893bb38e36fb6a81eead3edd1a

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

@@ -35,6 +35,7 @@ class DescriptorRegister {
       mapping.register(ViewPager::class.java, ViewPagerDescriptor)
       mapping.register(Drawable::class.java, DrawableDescriptor)
       mapping.register(ColorDrawable::class.java, ColorDrawableDescriptor)
+      mapping.register(OffsetChild::class.java, OffsetChildDescriptor)
       mapping.register(android.app.Fragment::class.java, FragmentFrameworkDescriptor)
       mapping.register(androidx.fragment.app.Fragment::class.java, FragmentSupportDescriptor)
 

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

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.flipper.plugins.uidebugger.descriptors
+
+import android.graphics.Bitmap
+import com.facebook.flipper.plugins.uidebugger.common.InspectableObject
+import com.facebook.flipper.plugins.uidebugger.model.Bounds
+
+/** a drawable or view that is mounted, along with the correct descriptor */
+class OffsetChild(val child: Any, val descriptor: NodeDescriptor<Any>, val x: Int, val y: Int) {
+  companion object {
+    fun zero(child: Any, descriptor: NodeDescriptor<Any>) = OffsetChild(child, descriptor, 0, 0)
+  }
+}
+
+object OffsetChildDescriptor : NodeDescriptor<OffsetChild> {
+
+  override fun getBounds(node: OffsetChild): Bounds? {
+    val bounds = node.descriptor.getBounds(node.child)
+    return bounds?.copy(x = node.x, y = node.y)
+  }
+
+  override fun getName(node: OffsetChild): String = node.descriptor.getName(node.child)
+
+  override fun getChildren(node: OffsetChild): List<Any> = node.descriptor.getChildren(node.child)
+
+  override fun getActiveChild(node: OffsetChild): Any? = node.descriptor.getActiveChild(node.child)
+
+  override fun getData(node: OffsetChild): Map<SectionName, InspectableObject> =
+      node.descriptor.getData(node.child)
+
+  override fun getTags(node: OffsetChild): Set<String> = node.descriptor.getTags(node.child)
+  override fun getSnapshot(node: OffsetChild, bitmap: Bitmap?): Bitmap? =
+      node.descriptor.getSnapshot(node.child, bitmap)
+}