Handle DOWN/MOVE/UP gestures with fling. (78f6e630) · Commits · e / os / android_frameworks_base

core/java/android/widget/AbsListView.java

+176 −171

Original line number	Diff line number	Diff line
		@@ -2771,15 +2771,21 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		}
		}

		private boolean startScrollIfNeeded(int deltaY) {
		private boolean startScrollIfNeeded(int y) {
		// Check if we have moved far enough that it looks more like a
		// scroll than a tap
		final int deltaY = y - mMotionY;
		final int distance = Math.abs(deltaY);
		final boolean overscroll = mScrollY != 0;
		if (overscroll \|\| distance > mTouchSlop) {
		createScrollingCache();
		mTouchMode = overscroll ? TOUCH_MODE_OVERSCROLL : TOUCH_MODE_SCROLL;
		mMotionCorrection = deltaY;
		if (overscroll) {
		mTouchMode = TOUCH_MODE_OVERSCROLL;
		mMotionCorrection = 0;
		} else {
		mTouchMode = TOUCH_MODE_SCROLL;
		mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop;
		}
		final Handler handler = getHandler();
		// Handler should not be null unless the AbsListView is not attached to a
		// window, which would make it very hard to scroll it... but the monkeys
		@@ -2799,152 +2805,19 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		if (parent != null) {
		parent.requestDisallowInterceptTouchEvent(true);
		}
		scrollIfNeeded(y);
		return true;
		}

		return false;
		}

		public void onTouchModeChanged(boolean isInTouchMode) {
		if (isInTouchMode) {
		// Get rid of the selection when we enter touch mode
		hideSelector();
		// Layout, but only if we already have done so previously.
		// (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore
		// state.)
		if (getHeight() > 0 && getChildCount() > 0) {
		// We do not lose focus initiating a touch (since AbsListView is focusable in
		// touch mode). Force an initial layout to get rid of the selection.
		layoutChildren();
		}
		updateSelectorState();
		} else {
		int touchMode = mTouchMode;
		if (touchMode == TOUCH_MODE_OVERSCROLL \|\| touchMode == TOUCH_MODE_OVERFLING) {
		if (mFlingRunnable != null) {
		mFlingRunnable.endFling();
		}
		if (mPositionScroller != null) {
		mPositionScroller.stop();
		}

		if (mScrollY != 0) {
		mScrollY = 0;
		invalidateParentCaches();
		finishGlows();
		invalidate();
		}
		}
		}
		}

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (!isEnabled()) {
		// A disabled view that is clickable still consumes the touch
		// events, it just doesn't respond to them.
		return isClickable() \|\| isLongClickable();
		}

		if (mFastScroller != null) {
		boolean intercepted = mFastScroller.onTouchEvent(ev);
		if (intercepted) {
		return true;
		}
		}

		final int action = ev.getAction();

		View v;
		int deltaY;

		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);

		switch (action & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_DOWN: {
		switch (mTouchMode) {
		case TOUCH_MODE_OVERFLING: {
		mFlingRunnable.endFling();
		if (mPositionScroller != null) {
		mPositionScroller.stop();
		}
		mTouchMode = TOUCH_MODE_OVERSCROLL;
		mMotionX = (int) ev.getX();
		mMotionY = mLastY = (int) ev.getY();
		mMotionCorrection = 0;
		mActivePointerId = ev.getPointerId(0);
		mDirection = 0;
		break;
		}

		default: {
		mActivePointerId = ev.getPointerId(0);
		final int x = (int) ev.getX();
		final int y = (int) ev.getY();
		int motionPosition = pointToPosition(x, y);
		if (!mDataChanged) {
		if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0)
		&& (getAdapter().isEnabled(motionPosition))) {
		// User clicked on an actual view (and was not stopping a fling).
		// It might be a click or a scroll. Assume it is a click until
		// proven otherwise
		mTouchMode = TOUCH_MODE_DOWN;
		// FIXME Debounce
		if (mPendingCheckForTap == null) {
		mPendingCheckForTap = new CheckForTap();
		}
		postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
		} else {
		if (mTouchMode == TOUCH_MODE_FLING) {
		// Stopped a fling. It is a scroll.
		createScrollingCache();
		mTouchMode = TOUCH_MODE_SCROLL;
		mMotionCorrection = 0;
		motionPosition = findMotionRow(y);
		mFlingRunnable.flywheelTouch();
		}
		}
		}

		if (motionPosition >= 0) {
		// Remember where the motion event started
		v = getChildAt(motionPosition - mFirstPosition);
		mMotionViewOriginalTop = v.getTop();
		}
		mMotionX = x;
		mMotionY = y;
		mMotionPosition = motionPosition;
		mLastY = Integer.MIN_VALUE;
		break;
		}
		}

		if (performButtonActionOnTouchDown(ev)) {
		if (mTouchMode == TOUCH_MODE_DOWN) {
		removeCallbacks(mPendingCheckForTap);
		}
		}
		break;
		}
		private void scrollIfNeeded(int y) {
		final int rawDeltaY = y - mMotionY;
		final int deltaY = rawDeltaY - mMotionCorrection;
		int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

		case MotionEvent.ACTION_MOVE: {
		int pointerIndex = ev.findPointerIndex(mActivePointerId);
		if (pointerIndex == -1) {
		pointerIndex = 0;
		mActivePointerId = ev.getPointerId(pointerIndex);
		}
		final int y = (int) ev.getY(pointerIndex);
		deltaY = y - mMotionY;
		switch (mTouchMode) {
		case TOUCH_MODE_DOWN:
		case TOUCH_MODE_TAP:
		case TOUCH_MODE_DONE_WAITING:
		// Check if we have moved far enough that it looks more like a
		// scroll than a tap
		startScrollIfNeeded(deltaY);
		break;
		case TOUCH_MODE_SCROLL:
		if (mTouchMode == TOUCH_MODE_SCROLL) {
		if (PROFILE_SCROLLING) {
		if (!mScrollProfilingStarted) {
		Debug.startMethodTracing("AbsListViewScroll");
		@@ -2962,17 +2835,13 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		// If so, we haven't disallowed intercepting touch events yet.
		// Make sure that we do so in case we're in a parent that can intercept.
		if ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) == 0 &&
		Math.abs(deltaY) > mTouchSlop) {
		Math.abs(rawDeltaY) > mTouchSlop) {
		final ViewParent parent = getParent();
		if (parent != null) {
		parent.requestDisallowInterceptTouchEvent(true);
		}
		}

		final int rawDeltaY = deltaY;
		deltaY -= mMotionCorrection;
		int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

		final int motionIndex;
		if (mMotionPosition >= 0) {
		motionIndex = mMotionPosition - mFirstPosition;
		@@ -3038,14 +2907,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		}
		mLastY = y;
		}
		break;

		case TOUCH_MODE_OVERSCROLL:
		} else if (mTouchMode == TOUCH_MODE_OVERSCROLL) {
		if (y != mLastY) {
		final int rawDeltaY = deltaY;
		deltaY -= mMotionCorrection;
		int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

		final int oldScroll = mScrollY;
		final int newScroll = oldScroll - incrementalDeltaY;
		int newDirection = y > mLastY ? 1 : -1;
		@@ -3109,9 +2972,151 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		mLastY = y;
		mDirection = newDirection;
		}
		}
		}

		public void onTouchModeChanged(boolean isInTouchMode) {
		if (isInTouchMode) {
		// Get rid of the selection when we enter touch mode
		hideSelector();
		// Layout, but only if we already have done so previously.
		// (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore
		// state.)
		if (getHeight() > 0 && getChildCount() > 0) {
		// We do not lose focus initiating a touch (since AbsListView is focusable in
		// touch mode). Force an initial layout to get rid of the selection.
		layoutChildren();
		}
		updateSelectorState();
		} else {
		int touchMode = mTouchMode;
		if (touchMode == TOUCH_MODE_OVERSCROLL \|\| touchMode == TOUCH_MODE_OVERFLING) {
		if (mFlingRunnable != null) {
		mFlingRunnable.endFling();
		}
		if (mPositionScroller != null) {
		mPositionScroller.stop();
		}

		if (mScrollY != 0) {
		mScrollY = 0;
		invalidateParentCaches();
		finishGlows();
		invalidate();
		}
		}
		}
		}

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (!isEnabled()) {
		// A disabled view that is clickable still consumes the touch
		// events, it just doesn't respond to them.
		return isClickable() \|\| isLongClickable();
		}

		if (mFastScroller != null) {
		boolean intercepted = mFastScroller.onTouchEvent(ev);
		if (intercepted) {
		return true;
		}
		}

		final int action = ev.getAction();

		View v;

		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);

		switch (action & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_DOWN: {
		switch (mTouchMode) {
		case TOUCH_MODE_OVERFLING: {
		mFlingRunnable.endFling();
		if (mPositionScroller != null) {
		mPositionScroller.stop();
		}
		mTouchMode = TOUCH_MODE_OVERSCROLL;
		mMotionX = (int) ev.getX();
		mMotionY = mLastY = (int) ev.getY();
		mMotionCorrection = 0;
		mActivePointerId = ev.getPointerId(0);
		mDirection = 0;
		break;
		}

		default: {
		mActivePointerId = ev.getPointerId(0);
		final int x = (int) ev.getX();
		final int y = (int) ev.getY();
		int motionPosition = pointToPosition(x, y);
		if (!mDataChanged) {
		if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0)
		&& (getAdapter().isEnabled(motionPosition))) {
		// User clicked on an actual view (and was not stopping a fling).
		// It might be a click or a scroll. Assume it is a click until
		// proven otherwise
		mTouchMode = TOUCH_MODE_DOWN;
		// FIXME Debounce
		if (mPendingCheckForTap == null) {
		mPendingCheckForTap = new CheckForTap();
		}
		postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
		} else {
		if (mTouchMode == TOUCH_MODE_FLING) {
		// Stopped a fling. It is a scroll.
		createScrollingCache();
		mTouchMode = TOUCH_MODE_SCROLL;
		mMotionCorrection = 0;
		motionPosition = findMotionRow(y);
		mFlingRunnable.flywheelTouch();
		}
		}
		}

		if (motionPosition >= 0) {
		// Remember where the motion event started
		v = getChildAt(motionPosition - mFirstPosition);
		mMotionViewOriginalTop = v.getTop();
		}
		mMotionX = x;
		mMotionY = y;
		mMotionPosition = motionPosition;
		mLastY = Integer.MIN_VALUE;
		break;
		}
		}

		if (performButtonActionOnTouchDown(ev)) {
		if (mTouchMode == TOUCH_MODE_DOWN) {
		removeCallbacks(mPendingCheckForTap);
		}
		}
		break;
		}

		case MotionEvent.ACTION_MOVE: {
		int pointerIndex = ev.findPointerIndex(mActivePointerId);
		if (pointerIndex == -1) {
		pointerIndex = 0;
		mActivePointerId = ev.getPointerId(pointerIndex);
		}
		final int y = (int) ev.getY(pointerIndex);
		switch (mTouchMode) {
		case TOUCH_MODE_DOWN:
		case TOUCH_MODE_TAP:
		case TOUCH_MODE_DONE_WAITING:
		// Check if we have moved far enough that it looks more like a
		// scroll than a tap
		startScrollIfNeeded(y);
		break;
		case TOUCH_MODE_SCROLL:
		case TOUCH_MODE_OVERSCROLL:
		scrollIfNeeded(y);
		break;
		}
		break;
		}

		@@ -3542,7 +3547,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		final int y = (int) ev.getY(pointerIndex);
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);
		if (startScrollIfNeeded(y - mMotionY)) {
		if (startScrollIfNeeded(y)) {
		return true;
		}
		break;