[Carousel] Fixed focus order when using keyboard navigation for hero …

…carousels.

When using the keybaord to move between items, FocusFinder would occasionally skip an item because it was using the unmasked bounds of each item to compare their distance.

PiperOrigin-RevId: 572025177

lib/java/com/google/android/material/carousel/MaskableFrameLayout.java

@@ -19,6 +19,7 @@
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
@@ -72,6 +73,11 @@ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     }
   }
 
+  @Override
+  public void getFocusedRect(Rect r) {
+    r.set((int) maskRect.left, (int) maskRect.top, (int) maskRect.right, (int) maskRect.bottom);
+  }
+
   @Override
   protected void onAttachedToWindow() {
     super.onAttachedToWindow();
@@ -133,10 +139,10 @@ public void setMaskXPercentage(float percentage) {
 
   private void updateMaskRectForMaskXPercentage() {
     if (maskXPercentage != NOT_SET) {
-    // Translate the percentage into an actual pixel value of how much of this view should be
-    // masked away.
-    float maskWidth = AnimationUtils.lerp(0f, getWidth() / 2F, 0f, 1f, maskXPercentage);
-    setMaskRectF(new RectF(maskWidth, 0F, (getWidth() - maskWidth), getHeight()));
+      // Translate the percentage into an actual pixel value of how much of this view should be
+      // masked away.
+      float maskWidth = AnimationUtils.lerp(0f, getWidth() / 2F, 0f, 1f, maskXPercentage);
+      setMaskRectF(new RectF(maskWidth, 0F, (getWidth() - maskWidth), getHeight()));
     }
   }