Fix key and accessibility scrubbing

Issue: #5767
PiperOrigin-RevId: 243811443

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

@@ -433,7 +433,7 @@ public class DefaultTimeBar extends View implements TimeBar {
   public void setDuration(long duration) {
     this.duration = duration;
     if (scrubbing && duration == C.TIME_UNSET) {
-      stopScrubbing(true);
+      stopScrubbing(/* canceled= */ true);
     }
     update();
   }
@@ -463,7 +463,7 @@ public class DefaultTimeBar extends View implements TimeBar {
   public void setEnabled(boolean enabled) {
     super.setEnabled(enabled);
     if (scrubbing && !enabled) {
-      stopScrubbing(true);
+      stopScrubbing(/* canceled= */ true);
     }
   }
 
@@ -487,8 +487,7 @@ public class DefaultTimeBar extends View implements TimeBar {
       case MotionEvent.ACTION_DOWN:
         if (isInSeekBar(x, y)) {
           positionScrubber(x);
-          startScrubbing();
-          scrubPosition = getScrubberPosition();
+          startScrubbing(getScrubberPosition());
           update();
           invalidate();
           return true;
@@ -503,10 +502,7 @@ public class DefaultTimeBar extends View implements TimeBar {
             lastCoarseScrubXPosition = x;
             positionScrubber(x);
           }
-          scrubPosition = getScrubberPosition();
-          for (OnScrubListener listener : listeners) {
-            listener.onScrubMove(this, scrubPosition);
-          }
+          updateScrubbing(getScrubberPosition());
           update();
           invalidate();
           return true;
@@ -515,7 +511,7 @@ public class DefaultTimeBar extends View implements TimeBar {
       case MotionEvent.ACTION_UP:
       case MotionEvent.ACTION_CANCEL:
         if (scrubbing) {
-          stopScrubbing(event.getAction() == MotionEvent.ACTION_CANCEL);
+          stopScrubbing(/* canceled= */ event.getAction() == MotionEvent.ACTION_CANCEL);
           return true;
         }
         break;
@@ -543,8 +539,7 @@ public class DefaultTimeBar extends View implements TimeBar {
         case KeyEvent.KEYCODE_DPAD_CENTER:
         case KeyEvent.KEYCODE_ENTER:
           if (scrubbing) {
-            removeCallbacks(stopScrubbingRunnable);
-            stopScrubbingRunnable.run();
+            stopScrubbing(/* canceled= */ false);
             return true;
           }
           break;
@@ -555,6 +550,15 @@ public class DefaultTimeBar extends View implements TimeBar {
     return super.onKeyDown(keyCode, event);
   }
 
+  @Override
+  protected void onFocusChanged(
+      boolean gainFocus, int direction, @Nullable Rect previouslyFocusedRect) {
+    super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
+    if (scrubbing && !gainFocus) {
+      stopScrubbing(/* canceled= */ false);
+    }
+  }
+
   @Override
   protected void drawableStateChanged() {
     super.drawableStateChanged();
@@ -637,11 +641,11 @@ public class DefaultTimeBar extends View implements TimeBar {
     }
     if (action == AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD) {
       if (scrubIncrementally(-getPositionIncrement())) {
-        stopScrubbing(false);
+        stopScrubbing(/* canceled= */ false);
       }
     } else if (action == AccessibilityNodeInfo.ACTION_SCROLL_FORWARD) {
       if (scrubIncrementally(getPositionIncrement())) {
-        stopScrubbing(false);
+        stopScrubbing(/* canceled= */ false);
       }
     } else {
       return false;
@@ -652,7 +656,8 @@ public class DefaultTimeBar extends View implements TimeBar {
 
   // Internal methods.
 
-  private void startScrubbing() {
+  private void startScrubbing(long scrubPosition) {
+    this.scrubPosition = scrubPosition;
     scrubbing = true;
     setPressed(true);
     ViewParent parent = getParent();
@@ -660,11 +665,22 @@ public class DefaultTimeBar extends View implements TimeBar {
       parent.requestDisallowInterceptTouchEvent(true);
     }
     for (OnScrubListener listener : listeners) {
-      listener.onScrubStart(this, getScrubberPosition());
+      listener.onScrubStart(this, scrubPosition);
+    }
+  }
+
+  private void updateScrubbing(long scrubPosition) {
+    if (this.scrubPosition == scrubPosition) {
+      return;
+    }
+    this.scrubPosition = scrubPosition;
+    for (OnScrubListener listener : listeners) {
+      listener.onScrubMove(this, scrubPosition);
     }
   }
 
   private void stopScrubbing(boolean canceled) {
+    removeCallbacks(stopScrubbingRunnable);
     scrubbing = false;
     setPressed(false);
     ViewParent parent = getParent();
@@ -673,10 +689,34 @@ public class DefaultTimeBar extends View implements TimeBar {
     }
     invalidate();
     for (OnScrubListener listener : listeners) {
-      listener.onScrubStop(this, getScrubberPosition(), canceled);
+      listener.onScrubStop(this, scrubPosition, canceled);
     }
   }
 
+  /**
+   * Incrementally scrubs the position by {@code positionChange}.
+   *
+   * @param positionChange The change in the scrubber position, in milliseconds. May be negative.
+   * @return Returns whether the scrubber position changed.
+   */
+  private boolean scrubIncrementally(long positionChange) {
+    if (duration <= 0) {
+      return false;
+    }
+    long previousPosition = scrubbing ? scrubPosition : position;
+    long scrubPosition = Util.constrainValue(previousPosition + positionChange, 0, duration);
+    if (scrubPosition == previousPosition) {
+      return false;
+    }
+    if (!scrubbing) {
+      startScrubbing(scrubPosition);
+    } else {
+      updateScrubbing(scrubPosition);
+    }
+    update();
+    return true;
+  }
+
   private void update() {
     bufferedBar.set(progressBar);
     scrubberBar.set(progressBar);
@@ -793,31 +833,6 @@ public class DefaultTimeBar extends View implements TimeBar {
         ? (duration == C.TIME_UNSET ? 0 : (duration / keyCountIncrement)) : keyTimeIncrement;
   }
 
-  /**
-   * Incrementally scrubs the position by {@code positionChange}.
-   *
-   * @param positionChange The change in the scrubber position, in milliseconds. May be negative.
-   * @return Returns whether the scrubber position changed.
-   */
-  private boolean scrubIncrementally(long positionChange) {
-    if (duration <= 0) {
-      return false;
-    }
-    long scrubberPosition = getScrubberPosition();
-    scrubPosition = Util.constrainValue(scrubberPosition + positionChange, 0, duration);
-    if (scrubPosition == scrubberPosition) {
-      return false;
-    }
-    if (!scrubbing) {
-      startScrubbing();
-    }
-    for (OnScrubListener listener : listeners) {
-      listener.onScrubMove(this, scrubPosition);
-    }
-    update();
-    return true;
-  }
-
   private boolean setDrawableLayoutDirection(Drawable drawable) {
     return Util.SDK_INT >= 23 && setDrawableLayoutDirection(drawable, getLayoutDirection());
   }

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

@@ -1109,6 +1109,9 @@ public class PlayerControlView extends FrameLayout {
     @Override
     public void onScrubStart(TimeBar timeBar, long position) {
       scrubbing = true;
+      if (positionView != null) {
+        positionView.setText(Util.getStringForTime(formatBuilder, formatter, position));
+      }
     }
 
     @Override

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

@@ -114,7 +114,7 @@ public interface TimeBar {
      * Called when the user starts moving the scrubber.
      *
      * @param timeBar The time bar.
-     * @param position The position of the scrubber, in milliseconds.
+     * @param position The scrub position in milliseconds.
      */
     void onScrubStart(TimeBar timeBar, long position);
 
@@ -122,7 +122,7 @@ public interface TimeBar {
      * Called when the user moves the scrubber.
      *
      * @param timeBar The time bar.
-     * @param position The position of the scrubber, in milliseconds.
+     * @param position The scrub position in milliseconds.
      */
     void onScrubMove(TimeBar timeBar, long position);
 
@@ -130,11 +130,10 @@ public interface TimeBar {
      * Called when the user stops moving the scrubber.
      *
      * @param timeBar The time bar.
-     * @param position The position of the scrubber, in milliseconds.
+     * @param position The scrub position in milliseconds.
      * @param canceled Whether scrubbing was canceled.
      */
     void onScrubStop(TimeBar timeBar, long position, boolean canceled);
-
   }
 
 }