Examples with VelocityTracker android.view.VelocityTracker used on opensource projects

Example 26 with VelocityTracker

use of android.view.VelocityTracker in project android-support-v4-googlemaps by petedoyle.

the class ViewPager method endFakeDrag.

/**
     * End a fake drag of the pager.
     *
     * @see #beginFakeDrag()
     * @see #fakeDragBy(float)
     */
public void endFakeDrag() {
    if (!mFakeDragging) {
        throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
    }
    final VelocityTracker velocityTracker = mVelocityTracker;
    velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
    int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
    mPopulatePending = true;
    final int width = getWidth();
    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 totalDelta = (int) (mLastMotionX - mInitialMotionX);
    int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
    setCurrentItemInternal(nextPage, true, true, initialVelocity);
    endDrag();
    mFakeDragging = false;
}

Example 27 with VelocityTracker

use of android.view.VelocityTracker in project JamsMusicPlayer by psaravan.

the class VelocityViewPager method onTouchEvent.

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (mFakeDragging) {
        // (It is likely that the user is multi-touching the screen.)
        return true;
    }
    if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // 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();
                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!");
                    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);
                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);
                if (Math.abs(initialVelocity) > mMinimumVelocity) {
                    fling(initialVelocity);
                    ViewCompat.postInvalidateOnAnimation(this);
                } else {
                    int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
                    setCurrentItemInternal(nextPage, true, true, initialVelocity);
                    needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
                }
                mActivePointerId = INVALID_POINTER;
                endDrag();
            } else {
            }
            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;
}

Example 28 with VelocityTracker

use of android.view.VelocityTracker in project JamsMusicPlayer by psaravan.

the class VelocityViewPager method endFakeDrag.

/**
     * End a fake drag of the pager.
     *
     * @see #beginFakeDrag()
     * @see #fakeDragBy(float)
     */
public void endFakeDrag() {
    if (!mFakeDragging) {
        throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
    }
    final VelocityTracker velocityTracker = mVelocityTracker;
    velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
    int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
    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 totalDelta = (int) (mLastMotionX - mInitialMotionX);
    int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity, totalDelta);
    setCurrentItemInternal(nextPage, true, true, initialVelocity);
    endDrag();
    mFakeDragging = false;
}

Example 29 with VelocityTracker

use of android.view.VelocityTracker in project weiciyuan by qii.

the class CustomViewAbove method onTouchEvent.

@Override
public boolean onTouchEvent(MotionEvent ev) {
    if (!mEnabled)
        return false;
    if (!mIsBeingDragged && !thisTouchAllowed(ev))
        return false;
    //		if (!mIsBeingDragged && !mQuickReturn)
    //			return false;
    final int action = ev.getAction();
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(ev);
    switch(action & MotionEventCompat.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN:
            /*
			 * If being flinged and user touches, stop the fling. isFinished
			 * will be false if being flinged.
			 */
            completeScroll();
            // Remember where the motion event started
            int index = MotionEventCompat.getActionIndex(ev);
            mActivePointerId = MotionEventCompat.getPointerId(ev, index);
            mLastMotionX = mInitialMotionX = ev.getX();
            break;
        case MotionEvent.ACTION_MOVE:
            if (!mIsBeingDragged) {
                determineDrag(ev);
                if (mIsUnableToDrag)
                    return false;
            }
            if (mIsBeingDragged) {
                // Scroll to follow the motion event
                final int activePointerIndex = getPointerIndex(ev, mActivePointerId);
                if (mActivePointerId == INVALID_POINTER)
                    break;
                final float x = MotionEventCompat.getX(ev, activePointerIndex);
                final float deltaX = mLastMotionX - x;
                mLastMotionX = x;
                float oldScrollX = getScrollX();
                float scrollX = oldScrollX + deltaX;
                final float leftBound = getLeftBound();
                final float rightBound = getRightBound();
                if (scrollX < leftBound) {
                    scrollX = leftBound;
                } else if (scrollX > rightBound) {
                    scrollX = rightBound;
                }
                // Don't lose the rounded component
                mLastMotionX += scrollX - (int) scrollX;
                scrollTo((int) scrollX, getScrollY());
                pageScrolled((int) scrollX);
            }
            break;
        case MotionEvent.ACTION_UP:
            if (mIsBeingDragged) {
                final VelocityTracker velocityTracker = mVelocityTracker;
                velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
                int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(velocityTracker, mActivePointerId);
                final int scrollX = getScrollX();
                //				final int widthWithMargin = getWidth();
                //				final float pageOffset = (float) (scrollX % widthWithMargin) / widthWithMargin;
                // TODO test this. should get better flinging behavior
                final float pageOffset = (float) (scrollX - getDestScrollX(mCurItem)) / getBehindWidth();
                final int activePointerIndex = getPointerIndex(ev, mActivePointerId);
                if (mActivePointerId != INVALID_POINTER) {
                    final float x = MotionEventCompat.getX(ev, activePointerIndex);
                    final int totalDelta = (int) (x - mInitialMotionX);
                    int nextPage = determineTargetPage(pageOffset, initialVelocity, totalDelta);
                    setCurrentItemInternal(nextPage, true, true, initialVelocity);
                } else {
                    setCurrentItemInternal(mCurItem, true, true, initialVelocity);
                }
                mActivePointerId = INVALID_POINTER;
                endDrag();
            } else if (mQuickReturn && mViewBehind.menuTouchInQuickReturn(mContent, mCurItem, ev.getX() + mScrollX)) {
                // close the menu
                setCurrentItem(1);
                endDrag();
            }
            break;
        case MotionEvent.ACTION_CANCEL:
            if (mIsBeingDragged) {
                setCurrentItemInternal(mCurItem, true, true);
                mActivePointerId = INVALID_POINTER;
                endDrag();
            }
            break;
        case MotionEventCompat.ACTION_POINTER_DOWN:
            {
                final int indexx = MotionEventCompat.getActionIndex(ev);
                mLastMotionX = MotionEventCompat.getX(ev, indexx);
                mActivePointerId = MotionEventCompat.getPointerId(ev, indexx);
                break;
            }
        case MotionEventCompat.ACTION_POINTER_UP:
            onSecondaryPointerUp(ev);
            int pointerIndex = getPointerIndex(ev, mActivePointerId);
            if (mActivePointerId == INVALID_POINTER)
                break;
            mLastMotionX = MotionEventCompat.getX(ev, pointerIndex);
            break;
    }
    return true;
}

Example 30 with VelocityTracker

use of android.view.VelocityTracker in project FlyRefresh by race604.

the class PullHeaderLayout method onTouchEvent.

@Override
public boolean onTouchEvent(MotionEvent ev) {
    MotionEvent vtev = MotionEvent.obtain(ev);
    final int actionMasked = MotionEventCompat.getActionMasked(ev);
    if (actionMasked == MotionEvent.ACTION_DOWN) {
        mNestedYOffset = 0;
    }
    vtev.offsetLocation(0, mNestedYOffset);
    switch(actionMasked) {
        case MotionEvent.ACTION_DOWN:
            {
                if ((mIsBeingDragged = !mScroller.isFinished())) {
                    final ViewParent parent = getParent();
                    if (parent != null) {
                        parent.requestDisallowInterceptTouchEvent(true);
                    }
                }
                /*
                 * If being flinged and user touches, stop the fling. isFinished
                 * will be false if being flinged.
                 */
                if (!mScroller.isFinished()) {
                    mScroller.abortAnimation();
                }
                // Remember where the motion event started
                mLastMotionY = (int) ev.getY();
                mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
                startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
                break;
            }
        case MotionEvent.ACTION_MOVE:
            final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
            if (activePointerIndex == -1) {
                Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent");
                break;
            }
            final int y = (int) MotionEventCompat.getY(ev, activePointerIndex);
            int deltaY = mLastMotionY - y;
            if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) {
                deltaY -= mScrollConsumed[1];
                vtev.offsetLocation(0, mScrollOffset[1]);
                mNestedYOffset += mScrollOffset[1];
            }
            if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
                mIsBeingDragged = true;
                if (deltaY > 0) {
                    deltaY -= mTouchSlop;
                } else {
                    deltaY += mTouchSlop;
                }
            }
            if (mIsBeingDragged) {
                // Scroll to follow the motion event
                mLastMotionY = y - mScrollOffset[1];
                final int scrolledDeltaY = moveBy(deltaY);
                final int unconsumedY = deltaY - scrolledDeltaY;
                if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset)) {
                    mLastMotionY -= mScrollOffset[1];
                    vtev.offsetLocation(0, mScrollOffset[1]);
                    mNestedYOffset += mScrollOffset[1];
                }
            }
            break;
        case MotionEvent.ACTION_UP:
            if (mIsBeingDragged) {
                final VelocityTracker velocityTracker = mVelocityTracker;
                velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
                int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, mActivePointerId);
                if ((Math.abs(initialVelocity) > mMinimumVelocity)) {
                    flingWithNestedDispatch(-initialVelocity);
                }
                mActivePointerId = INVALID_POINTER;
                endDrag();
            }
            break;
        case MotionEvent.ACTION_CANCEL:
            if (mIsBeingDragged && getChildCount() > 0) {
                mActivePointerId = INVALID_POINTER;
                endDrag();
            }
            break;
        case MotionEventCompat.ACTION_POINTER_DOWN:
            {
                final int index = MotionEventCompat.getActionIndex(ev);
                mLastMotionY = (int) MotionEventCompat.getY(ev, index);
                mActivePointerId = MotionEventCompat.getPointerId(ev, index);
                break;
            }
        case MotionEventCompat.ACTION_POINTER_UP:
            onSecondaryPointerUp(ev);
            mLastMotionY = (int) MotionEventCompat.getY(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
            break;
    }
    if (mVelocityTracker != null) {
        mVelocityTracker.addMovement(vtev);
    }
    vtev.recycle();
    return true;
}