Highlight section

Summary:
as title, highlight a section when hovering over it
Depends on D13900729

Reviewed By: astreet

Differential Revision: D13900789

fbshipit-source-id: 552554f5ecf9a9dd3edf4724581b7dee6a8a855d

android/src/main/java/com/facebook/flipper/plugins/litho/DebugSectionDescriptor.java

@@ -6,8 +6,14 @@
  */
 package com.facebook.flipper.plugins.litho;
 
+import android.graphics.Rect;
+import android.support.v4.view.MarginLayoutParamsCompat;
+import android.support.v4.view.ViewCompat;
+import android.view.View;
+import android.view.ViewGroup;
 import com.facebook.flipper.core.FlipperDynamic;
 import com.facebook.flipper.core.FlipperObject;
+import com.facebook.flipper.plugins.inspector.HighlightedOverlay;
 import com.facebook.flipper.plugins.inspector.Named;
 import com.facebook.flipper.plugins.inspector.NodeDescriptor;
 import com.facebook.flipper.plugins.inspector.Touch;
@@ -58,7 +64,59 @@ public class DebugSectionDescriptor extends NodeDescriptor<DebugSection> {
   @Override
   public void setHighlighted(DebugSection node, boolean selected, boolean isAlignmentMode)
       throws Exception {
-    // TODO T39526148
+    final int childCount = getChildCount(node);
+
+    if (node.isDiffSectionSpec()) {
+      for (int i = 0; i < childCount; i++) {
+        final View view = (View) getChildAt(node, i);
+        highlightChildView(view, selected, isAlignmentMode);
+      }
+    } else {
+      for (int i = 0; i < childCount; i++) {
+        final Object child = getChildAt(node, i);
+        final NodeDescriptor descriptor = descriptorForClass(child.getClass());
+        descriptor.setHighlighted(child, selected, isAlignmentMode);
+      }
+    }
+  }
+
+  // This is similar to the implementation in ViewDescriptor but doesn't
+  // target the parent view.
+  private void highlightChildView(View node, boolean selected, boolean isAlignmentMode) {
+    if (!selected) {
+      HighlightedOverlay.removeHighlight(node);
+      return;
+    }
+
+    final Rect padding =
+        new Rect(
+            ViewCompat.getPaddingStart(node),
+            node.getPaddingTop(),
+            ViewCompat.getPaddingEnd(node),
+            node.getPaddingBottom());
+
+    final Rect margin;
+    final ViewGroup.LayoutParams params = node.getLayoutParams();
+    if (params instanceof ViewGroup.MarginLayoutParams) {
+      final ViewGroup.MarginLayoutParams marginParams = (ViewGroup.MarginLayoutParams) params;
+      margin =
+          new Rect(
+              MarginLayoutParamsCompat.getMarginStart(marginParams),
+              marginParams.topMargin,
+              MarginLayoutParamsCompat.getMarginEnd(marginParams),
+              marginParams.bottomMargin);
+    } else {
+      margin = new Rect();
+    }
+
+    final int left = node.getLeft();
+    final int top = node.getTop();
+
+    final Rect contentBounds = new Rect(left, top, left + node.getWidth(), top + node.getHeight());
+
+    contentBounds.offset(-left, -top);
+
+    HighlightedOverlay.setHighlighted(node, margin, padding, contentBounds, false);
   }
 
   @Override