Debounce touch navigation taps and button presses (25b0c309) · Commits · e / os / android_frameworks_base

core/java/android/view/KeyEvent.java

+13 −0

Original line number	Diff line number	Diff line
		@@ -1837,6 +1837,19 @@ public class KeyEvent extends InputEvent implements Parcelable {
		}
		}

		/** Whether key will, by default, trigger a click on the focused view.
		* @hide
		*/
		public static final boolean isConfirmKey(int keyCode) {
		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_CENTER:
		case KeyEvent.KEYCODE_ENTER:
		return true;
		default:
		return false;
		}
		}

		/** {@inheritDoc} */
		@Override
		public final int getDeviceId() {

core/java/android/view/View.java

+11 −15

Original line number	Diff line number	Diff line
		@@ -7945,9 +7945,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		public boolean onKeyDown(int keyCode, KeyEvent event) {
		boolean result = false;

		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_CENTER:
		case KeyEvent.KEYCODE_ENTER: {
		if (KeyEvent.isConfirmKey(event.getKeyCode())) {
		if ((mViewFlags & ENABLED_MASK) == DISABLED) {
		return true;
		}
		@@ -7959,8 +7957,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		checkForLongClick(0);
		return true;
		}
		break;
		}
		}
		return result;
		}

core/java/android/view/ViewRootImpl.java

+37 −6

Original line number	Diff line number	Diff line
		@@ -228,6 +228,7 @@ public final class ViewRootImpl implements ViewParent,

		InputStage mFirstInputStage;
		InputStage mFirstPostImeInputStage;
		SyntheticInputStage mSyntheticInputStage;

		boolean mWindowAttributesChanged = false;
		int mWindowAttributesChangesFlag = 0;
		@@ -589,8 +590,8 @@ public final class ViewRootImpl implements ViewParent,

		// Set up the input pipeline.
		CharSequence counterSuffix = attrs.getTitle();
		InputStage syntheticStage = new SyntheticInputStage();
		InputStage viewPostImeStage = new ViewPostImeInputStage(syntheticStage);
		mSyntheticInputStage = new SyntheticInputStage();
		InputStage viewPostImeStage = new ViewPostImeInputStage(mSyntheticInputStage);
		InputStage nativePostImeStage = new NativePostImeInputStage(viewPostImeStage,
		"aq:native-post-ime:" + counterSuffix);
		InputStage earlyPostImeStage = new EarlyPostImeInputStage(nativePostImeStage);
		@@ -3773,6 +3774,9 @@ public final class ViewRootImpl implements ViewParent,
		private int processKeyEvent(QueuedInputEvent q) {
		final KeyEvent event = (KeyEvent)q.mEvent;

		// The synthetic stage occasionally needs to know about keys in order to debounce taps
		mSyntheticInputStage.notifyKeyEvent(event);

		// Deliver the key to the view hierarchy.
		if (mView.dispatchKeyEvent(event)) {
		return FINISH_HANDLED;
		@@ -3945,6 +3949,10 @@ public final class ViewRootImpl implements ViewParent,
		}
		super.onDeliverToNext(q);
		}

		public void notifyKeyEvent(KeyEvent e) {
		mTouchNavigation.notifyKeyEvent(e);
		}
		}

		/**
		@@ -4375,6 +4383,9 @@ public final class ViewRootImpl implements ViewParent,
		// Tap timeout in milliseconds.
		private static final int TAP_TIMEOUT = 250;

		// Debounce timeout for touch nav devices with a button under their pad, in milliseconds
		private static final int DEBOUNCE_TIME = 250;

		// The maximum distance traveled for a gesture to be considered a tap in millimeters.
		private static final int TAP_SLOP_MILLIMETERS = 5;

		@@ -4409,6 +4420,9 @@ public final class ViewRootImpl implements ViewParent,
		private int mConfigTapTimeout;
		private float mConfigTapSlop;

		// Amount of time to wait between button presses and tap generation for debouncing
		private int mConfigDebounceTime;

		// The scaled tick distance. A movement of this amount should generally translate
		// into a single dpad event in a given direction.
		private float mConfigTickDistance;
		@@ -4454,6 +4468,11 @@ public final class ViewRootImpl implements ViewParent,
		private boolean mFlinging;
		private float mFlingVelocity;

		// The last time a confirm key was pressed on the touch nav device
		private long mLastConfirmKeyTime = Long.MAX_VALUE;

		private boolean mHasButtonUnderPad;

		public SyntheticTouchNavigationHandler() {
		super(true);
		}
		@@ -4497,6 +4516,8 @@ public final class ViewRootImpl implements ViewParent,
		MIN_FLING_VELOCITY_TICKS_PER_SECOND * mConfigTickDistance;
		mConfigMaxFlingVelocity =
		MAX_FLING_VELOCITY_TICKS_PER_SECOND * mConfigTickDistance;
		mConfigDebounceTime = DEBOUNCE_TIME;
		mHasButtonUnderPad = device.hasButtonUnderPad();

		if (LOCAL_DEBUG) {
		Log.d(LOCAL_TAG, "Configured device " + mCurrentDeviceId
		@@ -4567,10 +4588,13 @@ public final class ViewRootImpl implements ViewParent,
		if (!mConsumedMovement
		&& Math.hypot(mLastX - mStartX, mLastY - mStartY) < mConfigTapSlop
		&& time <= mStartTime + mConfigTapTimeout) {
		if (!mHasButtonUnderPad \|\|
		time >= mLastConfirmKeyTime + mConfigDebounceTime) {
		// It's a tap!
		finishKeys(time);
		sendKeyDownOrRepeat(time, KeyEvent.KEYCODE_DPAD_CENTER, metaState);
		sendKeyUp(time);
		}
		} else if (mConsumedMovement
		&& mPendingKeyCode != KeyEvent.KEYCODE_UNKNOWN) {
		// It might be a fling.
		@@ -4603,6 +4627,13 @@ public final class ViewRootImpl implements ViewParent,
		}
		}

		public void notifyKeyEvent(KeyEvent e) {
		final int keyCode = e.getKeyCode();
		if (KeyEvent.isConfirmKey(e.getKeyCode())) {
		mLastConfirmKeyTime = e.getDownTime();
		}
		}

		private void finishKeys(long time) {
		cancelFling();
		sendKeyUp(time);