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.appunite.list.AbsListView.java

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 = getScrollY() != 0;
    if (overscroll || distance > mTouchSlop) {
        createScrollingCache();/* www .  j a  v a2 s  .co  m*/
        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
        // say it's possible.
        if (handler != null) {
            handler.removeCallbacks(mPendingCheckForLongPress);
        }
        setPressed(false);
        View motionView = getChildAt(mMotionPosition - mFirstPosition);
        if (motionView != null) {
            motionView.setPressed(false);
        }
        reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
        // Time to start stealing events! Once we've stolen them, don't let anyone
        // steal from us
        final ViewParent parent = getParent();
        if (parent != null) {
            parent.requestDisallowInterceptTouchEvent(true);
        }
        scrollIfNeeded(y);
        return true;
    }

    return false;
}

From source file:com.aliasapps.seq.scroller.TwoWayView.java

private boolean maybeStartScrolling(int delta) {
    final boolean isOverScroll = (mOverScroll != 0);
    if (Math.abs(delta) <= mTouchSlop && !isOverScroll) {
        return false;
    }/*  w  w  w.j a v  a  2 s. com*/

    if (isOverScroll) {
        mTouchMode = TOUCH_MODE_OVERSCROLL;
    } else {
        mTouchMode = TOUCH_MODE_DRAGGING;
    }

    // Time to start stealing events! Once we've stolen them, don't
    // let anyone steal from us.
    final ViewParent parent = getParent();
    if (parent != null) {
        parent.requestDisallowInterceptTouchEvent(true);
    }

    cancelCheckForLongPress();

    setPressed(false);
    View motionView = getChildAt(mMotionPosition - mFirstPosition);
    if (motionView != null) {
        motionView.setPressed(false);
    }

    reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);

    return true;
}

From source file:com.aliasapps.seq.scroller.TwoWayView.java

private void handleDragChange(int delta) {
    // Time to start stealing events! Once we've stolen them, don't
    // let anyone steal from us.
    final ViewParent parent = getParent();
    if (parent != null) {
        parent.requestDisallowInterceptTouchEvent(true);
    }/*from  w  ww.  j  a v  a 2  s.  c  om*/

    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;
    }

    int motionViewPrevStart = 0;
    View motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        motionViewPrevStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());
    }

    boolean atEdge = scrollListItemsBy(delta);

    motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        final int motionViewRealStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());

        if (atEdge) {
            final int overscroll = -delta - (motionViewRealStart - motionViewPrevStart);
            updateOverScrollState(delta, overscroll);
        }
    }
}

From source file:com.appunite.list.AbsListView.java

private void scrollIfNeeded(int y) {
    final int rawDeltaY = y - mMotionY;
    final int deltaY = rawDeltaY - mMotionCorrection;
    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

    if (mTouchMode == TOUCH_MODE_SCROLL) {
        if (PROFILE_SCROLLING) {
            if (!mScrollProfilingStarted) {
                Debug.startMethodTracing("AbsListViewScroll");
                mScrollProfilingStarted = true;
            }/*from w ww .  j av  a2s  .  c om*/
        }

        // TODO removed strict span in backport (j. m.)
        //if (mScrollStrictSpan == null) {
        //    // If it's non-null, we're already in a scroll.
        //    mScrollStrictSpan = StrictMode.enterCriticalSpan("AbsListView-scroll");
        //}

        if (y != mLastY) {
            // We may be here after stopping a fling and continuing to scroll.
            // 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 (!mDisallowIntercept && 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;
            }

            int motionViewPrevTop = 0;
            View motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                motionViewPrevTop = motionView.getTop();
            }

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

            // Check to see if we have bumped into the scroll limit
            motionView = this.getChildAt(motionIndex);
            if (motionView != null) {
                // Check if the top of the motion view is where it is
                // supposed to be
                final int motionViewRealTop = motionView.getTop();
                if (atEdge) {
                    // Apply overscroll
                    final int scrollY = getScrollY();

                    int overscroll = -incrementalDeltaY - (motionViewRealTop - motionViewPrevTop);
                    overScrollBy(0, overscroll, 0, scrollY, 0, 0, 0, mOverscrollDistance, true);
                    if (Math.abs(mOverscrollDistance) == Math.abs(scrollY)) {
                        // Don't allow overfling if we're at the edge.
                        if (mVelocityTracker != null) {
                            mVelocityTracker.clear();
                        }
                    }

                    final int overscrollMode = getOverScrollMode();
                    if (overscrollMode == OVER_SCROLL_ALWAYS
                            || (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) {
                        mDirection = 0; // Reset when entering overscroll.
                        mTouchMode = TOUCH_MODE_OVERSCROLL;
                        if (rawDeltaY > 0) {
                            mEdgeGlowTop.onPull((float) overscroll / getHeight());
                            if (!mEdgeGlowBottom.isFinished()) {
                                mEdgeGlowBottom.onRelease();
                            }
                        } else if (rawDeltaY < 0) {
                            mEdgeGlowBottom.onPull((float) overscroll / getHeight());
                            if (!mEdgeGlowTop.isFinished()) {
                                mEdgeGlowTop.onRelease();
                            }
                        }
                        invalidate();
                    }
                }
                mMotionY = y;
            }
            mLastY = y;
        }
    } else if (mTouchMode == TOUCH_MODE_OVERSCROLL) {
        if (y != mLastY) {
            final int oldScroll = getScrollY();
            final int newScroll = oldScroll - incrementalDeltaY;
            int newDirection = y > mLastY ? 1 : -1;

            if (mDirection == 0) {
                mDirection = newDirection;
            }

            int overScrollDistance = -incrementalDeltaY;
            if ((newScroll < 0 && oldScroll >= 0) || (newScroll > 0 && oldScroll <= 0)) {
                overScrollDistance = -oldScroll;
                incrementalDeltaY += overScrollDistance;
            } else {
                incrementalDeltaY = 0;
            }

            if (overScrollDistance != 0) {
                final int scrollY = getScrollY();
                overScrollBy(0, overScrollDistance, 0, scrollY, 0, 0, 0, mOverscrollDistance, true);
                final int overscrollMode = getOverScrollMode();
                if (overscrollMode == OVER_SCROLL_ALWAYS
                        || (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) {
                    if (rawDeltaY > 0) {
                        mEdgeGlowTop.onPull((float) overScrollDistance / getHeight());
                        if (!mEdgeGlowBottom.isFinished()) {
                            mEdgeGlowBottom.onRelease();
                        }
                    } else if (rawDeltaY < 0) {
                        mEdgeGlowBottom.onPull((float) overScrollDistance / getHeight());
                        if (!mEdgeGlowTop.isFinished()) {
                            mEdgeGlowTop.onRelease();
                        }
                    }
                    invalidate();
                }
            }

            if (incrementalDeltaY != 0) {
                // Coming back to 'real' list scrolling
                if (getScrollY() != 0) {
                    scrollTo(getScrollX(), 0);
                    invalidateParentIfNeededUnhide();
                }

                trackMotionScroll(incrementalDeltaY, incrementalDeltaY);

                mTouchMode = TOUCH_MODE_SCROLL;

                // We did not scroll the full amount. Treat this essentially like the
                // start of a new touch scroll
                final int motionPosition = findClosestMotionRow(y);

                mMotionCorrection = 0;
                View motionView = getChildAt(motionPosition - mFirstPosition);
                mMotionViewOriginalTop = motionView != null ? motionView.getTop() : 0;
                mMotionY = y;
                mMotionPosition = motionPosition;
            }
            mLastY = y;
            mDirection = newDirection;
        }
    }
}

From source file:com.artifex.mupdf.view.ThumbnailViews.java

private void handleDragChange(int delta) {
    // Time to start stealing events! Once we've stolen them, don't
    // let anyone steal from us.
    final ViewParent parent = getParent();
    if (parent != null) {
        parent.requestDisallowInterceptTouchEvent(true);
    }/*w  w w.  j a  v  a2  s. com*/

    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;
    }

    int motionViewPrevStart = 0;
    View motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        motionViewPrevStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());
    }

    boolean atEdge = trackMotionScroll(delta);

    motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        final int motionViewRealStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());

        if (atEdge) {
            final int overscroll = -delta - (motionViewRealStart - motionViewPrevStart);
            updateOverScrollState(delta, overscroll);
        }
    }
}

From source file:com.kinth.mmspeed.ui.TwoWayView.java

private void handleDragChange(int delta) {
    // Time to start stealing events! Once we've stolen them, don't
    // let anyone steal from us.
    final ViewParent parent = getParent();
    if (parent != null) {
        parent.requestDisallowInterceptTouchEvent(true);
    }/*from  ww w .  j ava  2s . c o  m*/

    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;
    }

    int motionViewPrevStart = 0;
    View motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        motionViewPrevStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());
    }

    boolean atEdge = scrollListItemsBy(delta);

    motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        final int motionViewRealStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());

        if (atEdge) {
            final int overscroll = -delta - (motionViewRealStart - motionViewPrevStart);
            updateOverScrollState(delta, overscroll);
        }
    }
}

From source file:com.artifex.mupdflib.TwoWayView.java

private void handleDragChange(int delta) {
    // Time to start stealing events! Once we've stolen them, don't
    // let anyone steal from us.
    final ViewParent parent = getParent();
    if (parent != null) {
        parent.requestDisallowInterceptTouchEvent(true);
    }//from  ww  w .  j a v  a 2 s  .  c o m

    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;
    }

    int motionViewPrevStart = 0;
    View motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        motionViewPrevStart = getChildStartEdge(motionView);
    }

    boolean atEdge = scrollListItemsBy(delta);

    motionView = this.getChildAt(motionIndex);
    if (motionView != null) {
        final int motionViewRealStart = getChildStartEdge(motionView);

        if (atEdge) {
            final int overscroll = -delta - (motionViewRealStart - motionViewPrevStart);
            updateOverScrollState(delta, overscroll);
        }
    }
}

From source file:com.goftagram.telegram.messenger.support.widget.RecyclerView.java

@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
    if (mLayoutFrozen) {
        // When layout is frozen,  RV does not intercept the motion event.
        // A child view e.g. a button may still get the click.
        return false;
    }//from ww  w. j  ava2s. co m
    if (dispatchOnItemTouchIntercept(e)) {
        cancelTouch();
        return true;
    }

    if (mLayout == null) {
        return false;
    }

    final boolean canScrollHorizontally = mLayout.canScrollHorizontally();
    final boolean canScrollVertically = mLayout.canScrollVertically();

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

    final int action = MotionEventCompat.getActionMasked(e);
    final int actionIndex = MotionEventCompat.getActionIndex(e);

    switch (action) {
    case MotionEvent.ACTION_DOWN:
        if (mIgnoreMotionEventTillDown) {
            mIgnoreMotionEventTillDown = false;
        }
        mScrollPointerId = MotionEventCompat.getPointerId(e, 0);
        mInitialTouchX = mLastTouchX = (int) (e.getX() + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (e.getY() + 0.5f);

        if (mScrollState == SCROLL_STATE_SETTLING) {
            getParent().requestDisallowInterceptTouchEvent(true);
            setScrollState(SCROLL_STATE_DRAGGING);
        }

        int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE;
        if (canScrollHorizontally) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL;
        }
        if (canScrollVertically) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL;
        }
        startNestedScroll(nestedScrollAxis);
        break;

    case MotionEventCompat.ACTION_POINTER_DOWN:
        mScrollPointerId = MotionEventCompat.getPointerId(e, actionIndex);
        mInitialTouchX = mLastTouchX = (int) (MotionEventCompat.getX(e, actionIndex) + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (MotionEventCompat.getY(e, actionIndex) + 0.5f);
        break;

    case MotionEvent.ACTION_MOVE: {
        final int index = MotionEventCompat.findPointerIndex(e, mScrollPointerId);
        if (index < 0) {
            Log.e(TAG, "Error processing scroll; pointer index for id " + mScrollPointerId
                    + " not found. Did any MotionEvents get skipped?");
            return false;
        }

        final int x = (int) (MotionEventCompat.getX(e, index) + 0.5f);
        final int y = (int) (MotionEventCompat.getY(e, index) + 0.5f);
        if (mScrollState != SCROLL_STATE_DRAGGING) {
            final int dx = x - mInitialTouchX;
            final int dy = y - mInitialTouchY;
            boolean startScroll = false;
            if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) {
                mLastTouchX = mInitialTouchX + mTouchSlop * (dx < 0 ? -1 : 1);
                startScroll = true;
            }
            if (canScrollVertically && Math.abs(dy) > mTouchSlop) {
                mLastTouchY = mInitialTouchY + mTouchSlop * (dy < 0 ? -1 : 1);
                startScroll = true;
            }
            if (startScroll) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
                setScrollState(SCROLL_STATE_DRAGGING);
            }
        }
    }
        break;

    case MotionEventCompat.ACTION_POINTER_UP: {
        onPointerUp(e);
    }
        break;

    case MotionEvent.ACTION_UP: {
        mVelocityTracker.clear();
        stopNestedScroll();
    }
        break;

    case MotionEvent.ACTION_CANCEL: {
        cancelTouch();
    }
    }
    return mScrollState == SCROLL_STATE_DRAGGING;
}

From source file:com.goftagram.telegram.messenger.support.widget.RecyclerView.java

@Override
public boolean onTouchEvent(MotionEvent e) {
    if (mLayoutFrozen || mIgnoreMotionEventTillDown) {
        return false;
    }/*from   w w  w  . ja v a  2s  .  c  o m*/
    if (dispatchOnItemTouch(e)) {
        cancelTouch();
        return true;
    }

    if (mLayout == null) {
        return false;
    }

    final boolean canScrollHorizontally = mLayout.canScrollHorizontally();
    final boolean canScrollVertically = mLayout.canScrollVertically();

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    boolean eventAddedToVelocityTracker = false;

    final MotionEvent vtev = MotionEvent.obtain(e);
    final int action = MotionEventCompat.getActionMasked(e);
    final int actionIndex = MotionEventCompat.getActionIndex(e);

    if (action == MotionEvent.ACTION_DOWN) {
        mNestedOffsets[0] = mNestedOffsets[1] = 0;
    }
    vtev.offsetLocation(mNestedOffsets[0], mNestedOffsets[1]);

    switch (action) {
    case MotionEvent.ACTION_DOWN: {
        mScrollPointerId = MotionEventCompat.getPointerId(e, 0);
        mInitialTouchX = mLastTouchX = (int) (e.getX() + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (e.getY() + 0.5f);

        int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE;
        if (canScrollHorizontally) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL;
        }
        if (canScrollVertically) {
            nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL;
        }
        startNestedScroll(nestedScrollAxis);
    }
        break;

    case MotionEventCompat.ACTION_POINTER_DOWN: {
        mScrollPointerId = MotionEventCompat.getPointerId(e, actionIndex);
        mInitialTouchX = mLastTouchX = (int) (MotionEventCompat.getX(e, actionIndex) + 0.5f);
        mInitialTouchY = mLastTouchY = (int) (MotionEventCompat.getY(e, actionIndex) + 0.5f);
    }
        break;

    case MotionEvent.ACTION_MOVE: {
        final int index = MotionEventCompat.findPointerIndex(e, mScrollPointerId);
        if (index < 0) {
            Log.e(TAG, "Error processing scroll; pointer index for id " + mScrollPointerId
                    + " not found. Did any MotionEvents get skipped?");
            return false;
        }

        final int x = (int) (MotionEventCompat.getX(e, index) + 0.5f);
        final int y = (int) (MotionEventCompat.getY(e, index) + 0.5f);
        int dx = mLastTouchX - x;
        int dy = mLastTouchY - y;

        if (dispatchNestedPreScroll(dx, dy, mScrollConsumed, mScrollOffset)) {
            dx -= mScrollConsumed[0];
            dy -= mScrollConsumed[1];
            vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]);
            // Updated the nested offsets
            mNestedOffsets[0] += mScrollOffset[0];
            mNestedOffsets[1] += mScrollOffset[1];
        }

        if (mScrollState != SCROLL_STATE_DRAGGING) {
            boolean startScroll = false;
            if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) {
                if (dx > 0) {
                    dx -= mTouchSlop;
                } else {
                    dx += mTouchSlop;
                }
                startScroll = true;
            }
            if (canScrollVertically && Math.abs(dy) > mTouchSlop) {
                if (dy > 0) {
                    dy -= mTouchSlop;
                } else {
                    dy += mTouchSlop;
                }
                startScroll = true;
            }
            if (startScroll) {
                final ViewParent parent = getParent();
                if (parent != null) {
                    parent.requestDisallowInterceptTouchEvent(true);
                }
                setScrollState(SCROLL_STATE_DRAGGING);
            }
        }

        if (mScrollState == SCROLL_STATE_DRAGGING) {
            mLastTouchX = x - mScrollOffset[0];
            mLastTouchY = y - mScrollOffset[1];

            if (scrollByInternal(canScrollHorizontally ? dx : 0, canScrollVertically ? dy : 0, vtev)) {
                getParent().requestDisallowInterceptTouchEvent(true);
            }
        }
    }
        break;

    case MotionEventCompat.ACTION_POINTER_UP: {
        onPointerUp(e);
    }
        break;

    case MotionEvent.ACTION_UP: {
        mVelocityTracker.addMovement(vtev);
        eventAddedToVelocityTracker = true;
        mVelocityTracker.computeCurrentVelocity(1000, mMaxFlingVelocity);
        final float xvel = canScrollHorizontally
                ? -VelocityTrackerCompat.getXVelocity(mVelocityTracker, mScrollPointerId)
                : 0;
        final float yvel = canScrollVertically
                ? -VelocityTrackerCompat.getYVelocity(mVelocityTracker, mScrollPointerId)
                : 0;
        if (!((xvel != 0 || yvel != 0) && fling((int) xvel, (int) yvel))) {
            setScrollState(SCROLL_STATE_IDLE);
        }
        resetTouch();
    }
        break;

    case MotionEvent.ACTION_CANCEL: {
        cancelTouch();
    }
        break;
    }

    if (!eventAddedToVelocityTracker) {
        mVelocityTracker.addMovement(vtev);
    }
    vtev.recycle();

    return true;
}