Make DefaultTimeBar exclude itself for gestures

Issue: #6685
PiperOrigin-RevId: 284736041

RELEASENOTES.md

@@ -20,6 +20,8 @@
 * Upgrade Truth dependency from 0.44 to 1.0.
 * Upgrade to JUnit 4.13-rc-2.
 * Add support for attaching DRM sessions to clear content in the demo app.
+* UI: Exclude `DefaultTimeBar` region from system gesture detection
+  ([#6685](https://github.com/google/ExoPlayer/issues/6685)).
 
 ### 2.11.0 (2019-12-11) ###
 

library/ui/src/main/java/com/google/android/exoplayer2/ui/DefaultTimeBar.java

@@ -36,12 +36,15 @@
 import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
 import androidx.annotation.ColorInt;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
+import java.util.Collections;
 import java.util.Formatter;
 import java.util.Locale;
 import java.util.concurrent.CopyOnWriteArraySet;
+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 /**
  * A time bar that shows a current position, buffered position, duration and ad markers.
@@ -199,6 +202,7 @@ public class DefaultTimeBar extends View implements TimeBar {
   private int keyCountIncrement;
   private long keyTimeIncrement;
   private int lastCoarseScrubXPosition;
+  @MonotonicNonNull private Rect lastExclusionRectangle;
 
   private boolean scrubbing;
   private long scrubPosition;
@@ -604,6 +608,9 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
     seekBounds.set(seekLeft, barY, seekRight, barY + touchTargetHeight);
     progressBar.set(seekBounds.left + scrubberPadding, progressY,
         seekBounds.right - scrubberPadding, progressY + barHeight);
+    if (Util.SDK_INT >= 29) {
+      setSystemGestureExclusionRectsV29(width, height);
+    }
     update();
   }
 
@@ -834,6 +841,18 @@ private void updateDrawableState() {
     }
   }
 
+  @RequiresApi(29)
+  private void setSystemGestureExclusionRectsV29(int width, int height) {
+    if (lastExclusionRectangle != null
+        && lastExclusionRectangle.width() == width
+        && lastExclusionRectangle.height() == height) {
+      // Allocating inside onLayout is considered a DrawAllocation lint error, so avoid if possible.
+      return;
+    }
+    lastExclusionRectangle = new Rect(/* left= */ 0, /* top= */ 0, width, height);
+    setSystemGestureExclusionRects(Collections.singletonList(lastExclusionRectangle));
+  }
+
   private String getProgressText() {
     return Util.getStringForTime(formatBuilder, formatter, position);
   }