Example usage for android.view ViewParent requestDisallowInterceptTouchEvent

List of usage examples for android.view ViewParent requestDisallowInterceptTouchEvent

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Introduction

In this page you can find the example usage for android.view ViewParent requestDisallowInterceptTouchEvent.

Prototype

public void requestDisallowInterceptTouchEvent(boolean disallowIntercept);

Source Link

Document

Called when a child does not want this parent and its ancestors to intercept touch events with ViewGroup#onInterceptTouchEvent(MotionEvent) .

Usage

From source file:com.lovebridge.library.view.staggeredGridView.ExtendableListView.java

private void scrollIfNeeded(final int y) {
    if (DBG)/*from   w w  w.ja  v a  2s .  c o m*/
        Log.d(TAG, "scrollIfNeeded y: " + y);
    final int rawDeltaY = y - mMotionY;
    final int deltaY = rawDeltaY - mMotionCorrection;
    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;
    if (mTouchMode == TOUCH_MODE_SCROLLING) {
        if (DBG)
            Log.d(TAG, "scrollIfNeeded TOUCH_MODE_SCROLLING");
        if (y != mLastY) {
            // stop our parent
            if (Math.abs(rawDeltaY) > mTouchSlop) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
            final int motionIndex;
            if (mMotionPosition >= 0) {
                motionIndex = mMotionPosition - mFirstPosition;
            } else {
                // If we don't have a motion position that we can reliably
                // track,
                // pick something in the middle to make a best guess at
                // things below.
                motionIndex = getChildCount() / 2;
            }
            // No need to do all this work if we're not going to move anyway
            boolean atEdge = false;
            if (incrementalDeltaY != 0) {
                atEdge = moveTheChildren(deltaY, incrementalDeltaY);
            }
            // Check to see if we have bumped into the scroll limit
            View motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                if (atEdge) {
                    // TODO : edge effect & overscroll
                }
                mMotionY = y;
            }
            mLastY = y;
        }
    }
    // TODO : ELSE SUPPORT OVERSCROLL!
}

From source file:com.eland.android.eoas.Views.staggeredgridview.ExtendableListView.java

private void scrollIfNeeded(final int y) {
    if (DBG)/*from   www .j ava  2 s. c  om*/
        Log.d(TAG, "scrollIfNeeded y: " + y);
    final int rawDeltaY = y - mMotionY;
    final int deltaY = rawDeltaY - mMotionCorrection;
    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

    if (mTouchMode == TOUCH_MODE_SCROLLING) {
        if (DBG)
            Log.d(TAG, "scrollIfNeeded TOUCH_MODE_SCROLLING");
        if (y != mLastY) {
            // stop our parent
            if (Math.abs(rawDeltaY) > mTouchSlop) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }

            final int motionIndex;
            if (mMotionPosition >= 0) {
                motionIndex = mMotionPosition - mFirstPosition;
            } else {
                // If we don't have a motion position that we can reliably track,
                // pick something in the middle to make a best guess at things below.
                motionIndex = getChildCount() / 2;
            }

            // No need to do all this work if we're not going to move anyway
            boolean atEdge = false;
            if (incrementalDeltaY != 0) {
                atEdge = moveTheChildren(deltaY, incrementalDeltaY);
            }

            // Check to see if we have bumped into the scroll limit
            View motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                // Check if the top of the motion view is where it is
                // supposed to be
                if (atEdge) {
                    mTouchMode = TOUCH_MODE_DONE_WAITING;
                }

                mMotionY = y;
            }
            mLastY = y;
        }

    }
    // TODO : ELSE SUPPORT OVERSCROLL!
}

From source file:com.buka.view.grid.ExtendableListView.java

/**
 * Starts a scroll that moves the difference between y and our last motions y
 * if it's a movement that represents a big enough scroll.
 *//*  w ww  .  j  ava2s  .c  o m*/
private boolean startScrollIfNeeded(final int y) {
    final int deltaY = y - mMotionY;
    final int distance = Math.abs(deltaY);
    // TODO : Overscroll?
    // final boolean overscroll = mScrollY != 0;
    final boolean overscroll = false;
    if (overscroll || distance > mTouchSlop) {
        if (overscroll) {
            mMotionCorrection = 0;
        } else {
            mTouchMode = TOUCH_MODE_SCROLLING;
            mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop;
        }

        // TODO : LONG PRESS
        setPressed(false);
        View motionView = getChildAt(mMotionPosition - mFirstPosition);
        if (motionView != null) {
            motionView.setPressed(false);
        }
        final ViewParent parent = getParent();
        if (parent != null) {
            parent.requestDisallowInterceptTouchEvent(true);
        }

        scrollIfNeeded(y);
        return true;
    }
    return false;
}

From source file:com.sgj.verticalviewpager.VerticalViewPager.java

/*********************************************************************************************/

private void requestParentDisallowInterceptTouchEvent(boolean paramBoolean) {
    ViewParent localViewParent = getParent();
    if (localViewParent == null)
        return;//from ww  w .ja  v  a 2  s  .  c om
    localViewParent.requestDisallowInterceptTouchEvent(paramBoolean);
}

From source file:caesar.feng.framework.widget.StaggeredGrid.ExtendableListView.java

/**
 * Starts a scroll that moves the difference between y and our last motions y
 * if it's a movement that represents a big enough scroll.
 *///ww w  .  j  a v a2 s .  c  o  m
private boolean startScrollIfNeeded(final int y) {
    final int deltaY = y - mMotionY;
    final int distance = Math.abs(deltaY);
    // TODO : Overscroll?
    // final boolean overscroll = mScrollY != 0;
    final boolean overscroll = false;
    if (overscroll || distance > mTouchSlop) {
        if (overscroll) {
            mMotionCorrection = 0;
        } else {
            mTouchMode = TOUCH_MODE_SCROLLING;
            mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop;
        }

        final Handler handler = getHandler();
        if (handler != null) {
            handler.removeCallbacks(mPendingCheckForLongPress);
        }
        setPressed(false);
        View motionView = getChildAt(mMotionPosition - mFirstPosition);
        if (motionView != null) {
            motionView.setPressed(false);
        }
        final ViewParent parent = getParent();
        if (parent != null) {
            parent.requestDisallowInterceptTouchEvent(true);
        }

        scrollIfNeeded(y);
        return true;
    }
    return false;
}

From source file:caesar.feng.framework.widget.StaggeredGrid.ExtendableListView.java

private void scrollIfNeeded(final int y) {
    if (DBG)/*www.  j  ava 2 s. c  o m*/
        Log.d(TAG, "scrollIfNeeded y: " + y);
    final int rawDeltaY = y - mMotionY;
    final int deltaY = rawDeltaY - mMotionCorrection;
    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

    if (mTouchMode == TOUCH_MODE_SCROLLING) {
        if (DBG)
            Log.d(TAG, "scrollIfNeeded TOUCH_MODE_SCROLLING");
        if (y != mLastY) {
            // stop our parent
            if (Math.abs(rawDeltaY) > mTouchSlop) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }

            final int motionIndex;
            if (mMotionPosition >= 0) {
                motionIndex = mMotionPosition - mFirstPosition;
            } else {
                // If we don't have a motion position that we can reliably track,
                // pick something in the middle to make a best guess at things below.
                motionIndex = getChildCount() / 2;
            }

            // No need to do all this work if we're not going to move anyway
            boolean atEdge = false;
            if (incrementalDeltaY != 0) {
                atEdge = moveTheChildren(deltaY, incrementalDeltaY);
            }

            // Check to see if we have bumped into the scroll limit
            View motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                if (atEdge) {
                    // TODO : edge effect & overscroll
                }
                mMotionY = y;
            }
            mLastY = y;
        }

    }
    // TODO : ELSE SUPPORT OVERSCROLL!
}

From source file:com.isapp.android.circularviewpager.CircularViewPager.java

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }// ww w .j  a  va  2s  .c o  m
    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }
    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);
    final int action = ev.getAction();
    boolean needsInvalidate = false;
    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();
        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = MotionEventCompat.getY(ev, pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (DEBUG)
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            if (xDiff > mTouchSlop && xDiff > yDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");
                mMostRecentItemChangeDirection = x > mLastMotionX ? ITEM_CHANGE_DIRECTION_LEFT
                        : ITEM_CHANGE_DIRECTION_RIGHT;
                mIsBeingDragged = true;
                requestParentDisallowInterceptTouchEvent(true);
                mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                        : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollState(SCROLL_STATE_DRAGGING);
                setScrollingCacheEnabled(true);
                // Disallow Parent Intercept, just in case
                ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
            mPopulatePending = true;
            final int width = getClientWidth();
            final int scrollX = getScrollX();
            final ItemInfo ii = infoForCurrentScrollPosition();
            final int currentPage = ii.position;
            final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            final int totalDelta = (int) (x - mInitialMotionX);
            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = MotionEventCompat.getX(ev, index);
        mLastMotionX = x;
        mActivePointerId = MotionEventCompat.getPointerId(ev, index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}

From source file:com.lcr.widget.ExtendableListView.java

private void scrollIfNeeded(final int y) {
    if (DBG)//  w  ww  .j a va  2s.c  o  m
        Log.i(TAG, "scrollIfNeeded y: " + y);
    final int rawDeltaY = y - mMotionY;
    final int deltaY = rawDeltaY - mMotionCorrection;
    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

    if (mTouchMode == TOUCH_MODE_SCROLLING) {
        if (DBG)
            Log.i(TAG, "scrollIfNeeded TOUCH_MODE_SCROLLING");
        if (y != mLastY) {
            // stop our parent
            if (Math.abs(rawDeltaY) > mTouchSlop) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }

            final int motionIndex;
            if (mMotionPosition >= 0) {
                motionIndex = mMotionPosition - mFirstPosition;
            } else {
                // If we don't have a motion position that we can reliably track,
                // pick something in the middle to make a best guess at things below.
                motionIndex = getChildCount() / 2;
            }

            // No need to do all this work if we're not going to move anyway
            boolean atEdge = false;
            if (incrementalDeltaY != 0) {
                atEdge = moveTheChildren(deltaY, incrementalDeltaY);
            }

            // Check to see if we have bumped into the scroll limit
            View motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                if (atEdge) {
                    // TODO : edge effect & overscroll
                }
                mMotionY = y;
            }
            mLastY = y;
        }

    }
    // TODO : ELSE SUPPORT OVERSCROLL!
}

From source file:com.android.internal.widget.ViewPager.java

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }//from www  .  j a  v  a 2s . com

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;

    switch (action & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = ev.getPointerId(0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = ev.getY(pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (DEBUG)
                Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
            if (xDiff > mTouchSlop && xDiff > yDiff) {
                if (DEBUG)
                    Log.v(TAG, "Starting drag!");
                mIsBeingDragged = true;
                requestParentDisallowInterceptTouchEvent(true);
                mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                        : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollState(SCROLL_STATE_DRAGGING);
                setScrollingCacheEnabled(true);

                // Disallow Parent Intercept, just in case
                ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(activePointerIndex);
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            final int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId);

            mPopulatePending = true;

            final float scrollStart = getScrollStart();
            final float scrolledPages = scrollStart / getPaddedWidth();
            final ItemInfo ii = infoForFirstVisiblePage();
            final int currentPage = ii.position;
            final float nextPageOffset;
            if (isLayoutRtl()) {
                nextPageOffset = (ii.offset - scrolledPages) / ii.widthFactor;
            } else {
                nextPageOffset = (scrolledPages - ii.offset) / ii.widthFactor;
            }

            final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(activePointerIndex);
            final int totalDelta = (int) (x - mInitialMotionX);
            final int nextPage = determineTargetPage(currentPage, nextPageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            mActivePointerId = INVALID_POINTER;
            endDrag();
            mLeftEdge.onRelease();
            mRightEdge.onRelease();
            needsInvalidate = true;
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            mLeftEdge.onRelease();
            mRightEdge.onRelease();
            needsInvalidate = true;
        }
        break;
    case MotionEvent.ACTION_POINTER_DOWN: {
        final int index = ev.getActionIndex();
        final float x = ev.getX(index);
        mLastMotionX = x;
        mActivePointerId = ev.getPointerId(index);
        break;
    }
    case MotionEvent.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = ev.getX(ev.findPointerIndex(mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        postInvalidateOnAnimation();
    }
    return true;
}

From source file:com.pix.weibohomedemo.widget.ViewPagerModify.java

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // A fake drag is in progress already, ignore this real one
        // but still eat the touch events.
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }/*from www  . j a  va2 s  .co m*/

    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
    }

    if (mAdapter == null || mAdapter.getCount() == 0) {
        // Nothing to present or scroll; nothing to touch.
        return false;
    }

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);

    final int action = ev.getAction();
    boolean needsInvalidate = false;

    switch (action & MotionEventCompat.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN: {
        mScroller.abortAnimation();
        mPopulatePending = false;
        populate();

        // Remember where the motion event started
        mLastMotionX = mInitialMotionX = ev.getX();
        mLastMotionY = mInitialMotionY = ev.getY();
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
        break;
    }
    case MotionEvent.ACTION_MOVE:
        if (!mIsBeingDragged) {
            final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, pointerIndex);
            final float xDiff = Math.abs(x - mLastMotionX);
            final float y = MotionEventCompat.getY(ev, pointerIndex);
            final float yDiff = Math.abs(y - mLastMotionY);
            if (xDiff > mTouchSlop && xDiff > yDiff) {
                mIsBeingDragged = true;
                requestParentDisallowInterceptTouchEvent(true);
                mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop
                        : mInitialMotionX - mTouchSlop;
                mLastMotionY = y;
                setScrollState(SCROLL_STATE_DRAGGING);
                setScrollingCacheEnabled(true);

                // Disallow Parent Intercept, just in case
                ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
            }
        }
        // Not else! Note that mIsBeingDragged can be set above.
        if (mIsBeingDragged) {
            // Scroll to follow the motion event
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            needsInvalidate |= performDrag(x);
        }
        break;
    case MotionEvent.ACTION_UP:
        if (mIsBeingDragged) {
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
            int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
            mPopulatePending = true;
            final int width = getClientWidth();
            final int scrollX = getScrollX();
            final ItemInfo ii = infoForCurrentScrollPosition();
            final int currentPage = ii.position;
            final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            final float x = MotionEventCompat.getX(ev, activePointerIndex);
            final int totalDelta = (int) (x - mInitialMotionX);
            int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
            setCurrentItemInternal(nextPage, true, true, initialVelocity);

            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEvent.ACTION_CANCEL:
        if (mIsBeingDragged) {
            scrollToItem(mCurItem, true, 0, false);
            mActivePointerId = INVALID_POINTER;
            endDrag();
            needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
        }
        break;
    case MotionEventCompat.ACTION_POINTER_DOWN: {
        final int index = MotionEventCompat.getActionIndex(ev);
        final float x = MotionEventCompat.getX(ev, index);
        mLastMotionX = x;
        mActivePointerId = MotionEventCompat.getPointerId(ev, index);
        break;
    }
    case MotionEventCompat.ACTION_POINTER_UP:
        onSecondaryPointerUp(ev);
        mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
        break;
    }
    if (needsInvalidate) {
        ViewCompat.postInvalidateOnAnimation(this);
    }
    return true;
}