public void addRevealListener(int[] childIds, OnRevealListener l) {
        for (int i : childIds)
            addRevealListener(i, l);
    }

    public void removeRevealListener(int childId, OnRevealListener l) {
        View child = findViewById(childId);

        if (child == null) return;

        mShowEntirely.remove(child);
        if (mRevealListeners.containsKey(child)) mRevealListeners.get(child).remove(l);
    }

    public void removeAllRevealListeners(int childId) {
        View child = findViewById(childId);
        if (child != null) {
            mRevealListeners.remove(child);
            mShowEntirely.remove(child);
        }
    }

    private ViewDragHelper.Callback mDragHelperCallback = new ViewDragHelper.Callback() {

        @Override
        public int clampViewPositionHorizontal(View child, int left, int dx) {
            if (child == getSurfaceView()) {
                switch (mCurrentDragEdge) {
                    case Top:
                    case Bottom:
                        return getPaddingLeft();
                    case Left:
                        if (left < getPaddingLeft()) return getPaddingLeft();
                        if (left > getPaddingLeft() + mDragDistance)
                            return getPaddingLeft() + mDragDistance;
                        break;
                    case Right:
                        if (left > getPaddingLeft()) return getPaddingLeft();
                        if (left < getPaddingLeft() - mDragDistance)
                            return getPaddingLeft() - mDragDistance;
                        break;
                }
            } else if (getCurrentBottomView() == child) {

                switch (mCurrentDragEdge) {
                    case Top:
                    case Bottom:
                        return getPaddingLeft();
                    case Left:
                        if (mShowMode == ShowMode.PullOut) {
                            if (left > getPaddingLeft()) return getPaddingLeft();
                        }
                        break;
                    case Right:
                        if (mShowMode == ShowMode.PullOut) {
                            if (left < getMeasuredWidth() - mDragDistance) {
                                return getMeasuredWidth() - mDragDistance;
                            }
                        }
                        break;
                }
            }
            return left;
        }

        @Override
        public int clampViewPositionVertical(View child, int top, int dy) {
            if (child == getSurfaceView()) {
                switch (mCurrentDragEdge) {
                    case Left:
                    case Right:
                        return getPaddingTop();
                    case Top:
                        if (top < getPaddingTop()) return getPaddingTop();
                        if (top > getPaddingTop() + mDragDistance)
                            return getPaddingTop() + mDragDistance;
                        break;
                    case Bottom:
                        if (top < getPaddingTop() - mDragDistance) {
                            return getPaddingTop() - mDragDistance;
                        }
                        if (top > getPaddingTop()) {
                            return getPaddingTop();
                        }
                }
            } else {
                View surfaceView = getSurfaceView();
                int surfaceViewTop = surfaceView == null ? 0 : surfaceView.getTop();
                switch (mCurrentDragEdge) {
                    case Left:
                    case Right:
                        return getPaddingTop();
                    case Top:
                        if (mShowMode == ShowMode.PullOut) {
                            if (top > getPaddingTop()) return getPaddingTop();
                        } else {
                            if (surfaceViewTop + dy < getPaddingTop())
                                return getPaddingTop();
                            if (surfaceViewTop + dy > getPaddingTop() + mDragDistance)
                                return getPaddingTop() + mDragDistance;
                        }
                        break;
                    case Bottom:
                        if (mShowMode == ShowMode.PullOut) {
                            if (top < getMeasuredHeight() - mDragDistance)
                                return getMeasuredHeight() - mDragDistance;
                        } else {
                            if (surfaceViewTop + dy >= getPaddingTop())
                                return getPaddingTop();
                            if (surfaceViewTop + dy <= getPaddingTop() - mDragDistance)
                                return getPaddingTop() - mDragDistance;
                        }
                }
            }
            return top;
        }

        @Override
        public boolean tryCaptureView(View child, int pointerId) {
            boolean result = child == getSurfaceView() || getBottomViews().contains(child);
            if (result) {
                isCloseBeforeDrag = getOpenStatus() == Status.Close;
            }
            return result;
        }

        @Override
        public int getViewHorizontalDragRange(View child) {
            return mDragDistance;
        }

        @Override
        public int getViewVerticalDragRange(View child) {
            return mDragDistance;
        }

        boolean isCloseBeforeDrag = true;

        @Override
        public void onViewReleased(View releasedChild, float xvel, float yvel) {
            super.onViewReleased(releasedChild, xvel, yvel);
            processHandRelease(xvel, yvel, isCloseBeforeDrag);
            for (SwipeListener l : mSwipeListeners) {
                l.onHandRelease(SwipeLayout.this, xvel, yvel);
            }

            invalidate();
        }

        @Override
        public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
            View surfaceView = getSurfaceView();
            if (surfaceView == null) return;
            View currentBottomView = getCurrentBottomView();
            int evLeft = surfaceView.getLeft(),
                    evRight = surfaceView.getRight(),
                    evTop = surfaceView.getTop(),
                    evBottom = surfaceView.getBottom();
            if (changedView == surfaceView) {

                if (mShowMode == ShowMode.PullOut && currentBottomView != null) {
                    if (mCurrentDragEdge == DragEdge.Left || mCurrentDragEdge == DragEdge.Right) {
                        currentBottomView.offsetLeftAndRight(dx);
                    } else {
                        currentBottomView.offsetTopAndBottom(dy);
                    }
                }

            } else if (getBottomViews().contains(changedView)) {

                if (mShowMode == ShowMode.PullOut) {
                    surfaceView.offsetLeftAndRight(dx);
                    surfaceView.offsetTopAndBottom(dy);
                } else {
                    Rect rect = computeBottomLayDown(mCurrentDragEdge);
                    if (currentBottomView != null) {
                        currentBottomView.layout(rect.left, rect.top, rect.right, rect.bottom);
                    }

                    int newLeft = surfaceView.getLeft() + dx, newTop = surfaceView.getTop() + dy;

                    if (mCurrentDragEdge == DragEdge.Left && newLeft < getPaddingLeft())
                        newLeft = getPaddingLeft();
                    else if (mCurrentDragEdge == DragEdge.Right && newLeft > getPaddingLeft())
                        newLeft = getPaddingLeft();
                    else if (mCurrentDragEdge == DragEdge.Top && newTop < getPaddingTop())
                        newTop = getPaddingTop();
                    else if (mCurrentDragEdge == DragEdge.Bottom && newTop > getPaddingTop())
                        newTop = getPaddingTop();

                    surfaceView.layout(newLeft, newTop, newLeft + getMeasuredWidth(), newTop + getMeasuredHeight());
                }
            }

            dispatchRevealEvent(evLeft, evTop, evRight, evBottom);

            dispatchSwipeEvent(evLeft, evTop, dx, dy);

            invalidate();

            captureChildrenBound();
        }
    };

    /**
     * save children's bounds, so they can restore the bound in {@link #onLayout(boolean, int, int, int, int)}
     */
    private void captureChildrenBound() {
        View currentBottomView = getCurrentBottomView();
        if (getOpenStatus() == Status.Close) {
            mViewBoundCache.remove(currentBottomView);
            return;
        }

        View[] views = new View[]{getSurfaceView(), currentBottomView};
        for (View child : views) {
            Rect rect = mViewBoundCache.get(child);
            if (rect == null) {
                rect = new Rect();
                mViewBoundCache.put(child, rect);
            }
            rect.left = child.getLeft();
            rect.top = child.getTop();
            rect.right = child.getRight();
            rect.bottom = child.getBottom();
        }
    }

    /**
     * the dispatchRevealEvent method may not always get accurate position, it
     * makes the view may not always get the event when the view is totally
     * show( fraction = 1), so , we need to calculate every time.
     */
    protected boolean isViewTotallyFirstShowed(View child, Rect relativePosition, DragEdge edge, int surfaceLeft,
                                               int surfaceTop, int surfaceRight, int surfaceBottom) {
        if (mShowEntirely.get(child)) return false;
        int childLeft = relativePosition.left;
        int childRight = relativePosition.right;
        int childTop = relativePosition.top;
        int childBottom = relativePosition.bottom;
        boolean r = false;
        if (getShowMode() == ShowMode.LayDown) {
            if ((edge == DragEdge.Right && surfaceRight <= childLeft)
                    || (edge == DragEdge.Left && surfaceLeft >= childRight)
                    || (edge == DragEdge.Top && surfaceTop >= childBottom)
                    || (edge == DragEdge.Bottom && surfaceBottom <= childTop)) r = true;
        } else if (getShowMode() == ShowMode.PullOut) {
            if ((edge == DragEdge.Right && childRight <= getWidth())
                    || (edge == DragEdge.Left && childLeft >= getPaddingLeft())
                    || (edge == DragEdge.Top && childTop >= getPaddingTop())
                    || (edge == DragEdge.Bottom && childBottom <= getHeight())) r = true;
        }
        return r;
    }

    protected boolean isViewShowing(View child, Rect relativePosition, DragEdge availableEdge, int surfaceLeft,
                                    int surfaceTop, int surfaceRight, int surfaceBottom) {
        int childLeft = relativePosition.left;
        int childRight = relativePosition.right;
        int childTop = relativePosition.top;
        int childBottom = relativePosition.bottom;
        if (getShowMode() == ShowMode.LayDown) {
            switch (availableEdge) {
                case Right:
                    if (surfaceRight > childLeft && surfaceRight <= childRight) {
                        return true;
                    }
                    break;
                case Left:
                    if (surfaceLeft < childRight && surfaceLeft >= childLeft) {
                        return true;
                    }
                    break;
                case Top:
                    if (surfaceTop >= childTop && surfaceTop < childBottom) {
                        return true;
                    }
                    break;
                case Bottom:
                    if (surfaceBottom > childTop && surfaceBottom <= childBottom) {
                        return true;
                    }
                    break;
            }
        } else if (getShowMode() == ShowMode.PullOut) {
            switch (availableEdge) {
                case Right:
                    if (childLeft <= getWidth() && childRight > getWidth()) return true;
                    break;
                case Left:
                    if (childRight >= getPaddingLeft() && childLeft < getPaddingLeft()) return true;
                    break;
                case Top:
                    if (childTop < getPaddingTop() && childBottom >= getPaddingTop()) return true;
                    break;
                case Bottom:
                    if (childTop < getHeight() && childTop >= getPaddingTop()) return true;
                    break;
            }
        }
        return false;
    }

    protected Rect getRelativePosition(View child) {
        View t = child;
        Rect r = new Rect(t.getLeft(), t.getTop(), 0, 0);
        while (t.getParent() != null && t != getRootView()) {
            t = (View) t.getParent();
            if (t == this) break;
            r.left += t.getLeft();
            r.top += t.getTop();
        }
        r.right = r.left + child.getMeasuredWidth();
        r.bottom = r.top + child.getMeasuredHeight();
        return r;
    }

    private int mEventCounter = 0;

    protected void dispatchSwipeEvent(int surfaceLeft, int surfaceTop, int dx, int dy) {
        DragEdge edge = getDragEdge();
        boolean open = true;
        if (edge == DragEdge.Left) {
            if (dx < 0) open = false;
        } else if (edge == DragEdge.Right) {
            if (dx > 0) open = false;
        } else if (edge == DragEdge.Top) {
            if (dy < 0) open = false;
        } else if (edge == DragEdge.Bottom) {
            if (dy > 0) open = false;
        }

        dispatchSwipeEvent(surfaceLeft, surfaceTop, open);
    }

    protected void dispatchSwipeEvent(int surfaceLeft, int surfaceTop, boolean open) {
        safeBottomView();
        Status status = getOpenStatus();

        if (!mSwipeListeners.isEmpty()) {
            mEventCounter++;
            for (SwipeListener l : mSwipeListeners) {
                if (mEventCounter == 1) {
                    if (open) {
                        l.onStartOpen(this);
                    } else {
                        l.onStartClose(this);
                    }
                }
                l.onUpdate(SwipeLayout.this, surfaceLeft - getPaddingLeft(), surfaceTop - getPaddingTop());
            }

            if (status == Status.Close) {
                for (SwipeListener l : mSwipeListeners) {
                    l.onClose(SwipeLayout.this);
                }
                mEventCounter = 0;
            }

            if (status == Status.Open) {
                View currentBottomView = getCurrentBottomView();
                if (currentBottomView != null) {
                    currentBottomView.setEnabled(true);
                }
                for (SwipeListener l : mSwipeListeners) {
                    l.onOpen(SwipeLayout.this);
                }
                mEventCounter = 0;
            }
        }
    }

    /**
     * prevent bottom view get any touch event. Especially in LayDown mode.
     */
    private void safeBottomView() {
        Status status = getOpenStatus();
        List<View> bottoms = getBottomViews();

        if (status == Status.Close) {
            for (View bottom : bottoms) {
                if (bottom != null && bottom.getVisibility() != INVISIBLE) {
                    bottom.setVisibility(INVISIBLE);
                }
            }
        } else {
            View currentBottomView = getCurrentBottomView();
            if (currentBottomView != null && currentBottomView.getVisibility() != VISIBLE) {
                currentBottomView.setVisibility(VISIBLE);
            }
        }
    }

    protected void dispatchRevealEvent(final int surfaceLeft, final int surfaceTop, final int surfaceRight,
                                       final int surfaceBottom) {
        if (mRevealListeners.isEmpty()) return;
        for (Map.Entry<View, ArrayList<OnRevealListener>> entry : mRevealListeners.entrySet()) {
            View child = entry.getKey();
            Rect rect = getRelativePosition(child);
            if (isViewShowing(child, rect, mCurrentDragEdge, surfaceLeft, surfaceTop,
                    surfaceRight, surfaceBottom)) {
                mShowEntirely.put(child, false);
                int distance = 0;
                float fraction = 0f;
                if (getShowMode() == ShowMode.LayDown) {
                    switch (mCurrentDragEdge) {
                        case Left:
                            distance = rect.left - surfaceLeft;
                            fraction = distance / (float) child.getWidth();
                            break;
                        case Right:
                            distance = rect.right - surfaceRight;
                            fraction = distance / (float) child.getWidth();
                            break;
                        case Top:
                            distance = rect.top - surfaceTop;
                            fraction = distance / (float) child.getHeight();
                            break;
                        case Bottom:
                            distance = rect.bottom - surfaceBottom;
                            fraction = distance / (float) child.getHeight();
                            break;
                    }
                } else if (getShowMode() == ShowMode.PullOut) {
                    switch (mCurrentDragEdge) {
                        case Left:
                            distance = rect.right - getPaddingLeft();
                            fraction = distance / (float) child.getWidth();
                            break;
                        case Right:
                            distance = rect.left - getWidth();
                            fraction = distance / (float) child.getWidth();
                            break;
                        case Top:
                            distance = rect.bottom - getPaddingTop();
                            fraction = distance / (float) child.getHeight();
                            break;
                        case Bottom:
                            distance = rect.top - getHeight();
                            fraction = distance / (float) child.getHeight();
                            break;
                    }
                }

                for (OnRevealListener l : entry.getValue()) {
                    l.onReveal(child, mCurrentDragEdge, Math.abs(fraction), distance);
                    if (Math.abs(fraction) == 1) {
                        mShowEntirely.put(child, true);
                    }
                }
            }

            if (isViewTotallyFirstShowed(child, rect, mCurrentDragEdge, surfaceLeft, surfaceTop,
                    surfaceRight, surfaceBottom)) {
                mShowEntirely.put(child, true);
                for (OnRevealListener l : entry.getValue()) {
                    if (mCurrentDragEdge == DragEdge.Left
                            || mCurrentDragEdge == DragEdge.Right)
                        l.onReveal(child, mCurrentDragEdge, 1, child.getWidth());
                    else
                        l.onReveal(child, mCurrentDragEdge, 1, child.getHeight());
                }
            }

        }
    }

    @Override
    public void computeScroll() {
        super.computeScroll();
        if (mDragHelper.continueSettling(true)) {
            ViewCompat.postInvalidateOnAnimation(this);
        }
    }

    /**
     * {@link android.view.View.OnLayoutChangeListener} added in API 11. I need
     * to support it from API 8.
     */
    public interface OnLayout {
        void onLayout(SwipeLayout v);
    }

    private List<OnLayout> mOnLayoutListeners;

    public void addOnLayoutListener(OnLayout l) {
        if (mOnLayoutListeners == null) mOnLayoutListeners = new ArrayList<OnLayout>();
        mOnLayoutListeners.add(l);
    }

    public void removeOnLayoutListener(OnLayout l) {
        if (mOnLayoutListeners != null) mOnLayoutListeners.remove(l);
    }

    public void clearDragEdge() {
        mDragEdges.clear();
    }

    public void setDrag(DragEdge dragEdge, int childId) {
        clearDragEdge();
        addDrag(dragEdge, childId);
    }

    public void setDrag(DragEdge dragEdge, View child) {
        clearDragEdge();
        addDrag(dragEdge, child);
    }

    public void addDrag(DragEdge dragEdge, int childId) {
        addDrag(dragEdge, findViewById(childId), null);
    }

    public void addDrag(DragEdge dragEdge, View child) {
        addDrag(dragEdge, child, null);
    }

    public void addDrag(DragEdge dragEdge, View child, ViewGroup.LayoutParams params) {
        if (child == null) return;

        if (params == null) {
            params = generateDefaultLayoutParams();
        }
        if (!checkLayoutParams(params)) {
            params = generateLayoutParams(params);
        }
        int gravity = -1;
        switch (dragEdge) {
            case Left:
                gravity = Gravity.LEFT;
                break;
            case Right:
                gravity = Gravity.RIGHT;
                break;
            case Top:
                gravity = Gravity.TOP;
                break;
            case Bottom:
                gravity = Gravity.BOTTOM;
                break;
        }
        if (params instanceof FrameLayout.LayoutParams) {
            ((LayoutParams) params).gravity = gravity;
        }
        addView(child, 0, params);
    }

    @Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
        if (child == null) return;
        int gravity = Gravity.NO_GRAVITY;
        try {
            gravity = (Integer) params.getClass().getField("gravity").get(params);
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (gravity > 0) {
            gravity = GravityCompat.getAbsoluteGravity(gravity, ViewCompat.getLayoutDirection(this));

            if ((gravity & Gravity.LEFT) == Gravity.LEFT) {
                mDragEdges.put(DragEdge.Left, child);
            }
            if ((gravity & Gravity.RIGHT) == Gravity.RIGHT) {
                mDragEdges.put(DragEdge.Right, child);
            }
            if ((gravity & Gravity.TOP) == Gravity.TOP) {
                mDragEdges.put(DragEdge.Top, child);
            }
            if ((gravity & Gravity.BOTTOM) == Gravity.BOTTOM) {
                mDragEdges.put(DragEdge.Bottom, child);
            }
        } else {
            for (Map.Entry<DragEdge, View> entry : mDragEdges.entrySet()) {
                if (entry.getValue() == null) {
                    //means used the drag_edge attr, the no gravity child should be use set
                    mDragEdges.put(entry.getKey(), child);
                    break;
                }
            }
        }
        if (child.getParent() == this) {
            return;
        }
        super.addView(child, index, params);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        updateBottomViews();

        if (mOnLayoutListeners != null) for (int i = 0; i < mOnLayoutListeners.size(); i++) {
            mOnLayoutListeners.get(i).onLayout(this);
        }
    }

    void layoutPullOut() {
        View surfaceView = getSurfaceView();
        Rect surfaceRect = mViewBoundCache.get(surfaceView);
        if (surfaceRect == null) surfaceRect = computeSurfaceLayoutArea(false);
        if (surfaceView != null) {
            surfaceView.layout(surfaceRect.left, surfaceRect.top, surfaceRect.right, surfaceRect.bottom);
            bringChildToFront(surfaceView);
        }
        View currentBottomView = getCurrentBottomView();
        Rect bottomViewRect = mViewBoundCache.get(currentBottomView);
        if (bottomViewRect == null)
            bottomViewRect = computeBottomLayoutAreaViaSurface(ShowMode.PullOut, surfaceRect);
        if (currentBottomView != null) {
            currentBottomView.layout(bottomViewRect.left, bottomViewRect.top, bottomViewRect.right, bottomViewRect.bottom);
        }
    }

    void layoutLayDown() {
        View surfaceView = getSurfaceView();
        Rect surfaceRect = mViewBoundCache.get(surfaceView);
        if (surfaceRect == null) surfaceRect = computeSurfaceLayoutArea(false);
        if (surfaceView != null) {
            surfaceView.layout(surfaceRect.left, surfaceRect.top, surfaceRect.right, surfaceRect.bottom);
            bringChildToFront(surfaceView);
        }
        View currentBottomView = getCurrentBottomView();
        Rect bottomViewRect = mViewBoundCache.get(currentBottomView);
        if (bottomViewRect == null)
            bottomViewRect = computeBottomLayoutAreaViaSurface(ShowMode.LayDown, surfaceRect);
        if (currentBottomView != null) {
            currentBottomView.layout(bottomViewRect.left, bottomViewRect.top, bottomViewRect.right, bottomViewRect.bottom);
        }
    }

    private boolean mIsBeingDragged;

    private void checkCanDrag(MotionEvent ev) {
        if (mIsBeingDragged) return;
        if (getOpenStatus() == Status.Middle) {
            mIsBeingDragged = true;
            return;
        }
        Status status = getOpenStatus();
        float distanceX = ev.getRawX() - sX;
        float distanceY = ev.getRawY() - sY;
        float angle = Math.abs(distanceY / distanceX);
        angle = (float) Math.toDegrees(Math.atan(angle));
        if (getOpenStatus() == Status.Close) {
            DragEdge dragEdge;
            if (angle < 45) {
                if (distanceX > 0 && isLeftSwipeEnabled()) {
                    dragEdge = DragEdge.Left;
                } else if (distanceX < 0 && isRightSwipeEnabled()) {
                    dragEdge = DragEdge.Right;
                } else return;

            } else {
                if (distanceY > 0 && isTopSwipeEnabled()) {
                    dragEdge = DragEdge.Top;
                } else if (distanceY < 0 && isBottomSwipeEnabled()) {
                    dragEdge = DragEdge.Bottom;
                } else return;
            }
            setCurrentDragEdge(dragEdge);
        }

        boolean doNothing = false;
        if (mCurrentDragEdge == DragEdge.Right) {
            boolean suitable = (status == Status.Open && distanceX > mTouchSlop)
                    || (status == Status.Close && distanceX < -mTouchSlop);
            suitable = suitable || (status == Status.Middle);

            if (angle > 30 || !suitable) {
                doNothing = true;
            }
        }

        if (mCurrentDragEdge == DragEdge.Left) {
            boolean suitable = (status == Status.Open && distanceX < -mTouchSlop)
                    || (status == Status.Close && distanceX > mTouchSlop);
            suitable = suitable || status == Status.Middle;

            if (angle > 30 || !suitable) {
                doNothing = true;
            }
        }

        if (mCurrentDragEdge == DragEdge.Top) {
            boolean suitable = (status == Status.Open && distanceY < -mTouchSlop)
                    || (status == Status.Close && distanceY > mTouchSlop);
            suitable = suitable || status == Status.Middle;

            if (angle < 60 || !suitable) {
                doNothing = true;
            }
        }

        if (mCurrentDragEdge == DragEdge.Bottom) {
            boolean suitable = (status == Status.Open && distanceY > mTouchSlop)
                    || (status == Status.Close && distanceY < -mTouchSlop);
            suitable = suitable || status == Status.Middle;

            if (angle < 60 || !suitable) {
                doNothing = true;
            }
        }
        mIsBeingDragged = !doNothing;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (!isSwipeEnabled()) {
            return false;
        }
        if (mClickToClose && getOpenStatus() == Status.Open && isTouchOnSurface(ev)) {
            return true;
        }
        for (SwipeDenier denier : mSwipeDeniers) {
            if (denier != null && denier.shouldDenySwipe(ev)) {
                return false;
            }
        }

        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mDragHelper.processTouchEvent(ev);
                mIsBeingDragged = false;
                sX = ev.getRawX();
                sY = ev.getRawY();
                //if the swipe is in middle state(scrolling), should intercept the touch
                if (getOpenStatus() == Status.Middle) {
                    mIsBeingDragged = true;
                }
                break;
            case MotionEvent.ACTION_MOVE:
                boolean beforeCheck = mIsBeingDragged;
                checkCanDrag(ev);
                if (mIsBeingDragged) {
                    ViewParent parent = getParent();
                    if (parent != null) {
                        parent.requestDisallowInterceptTouchEvent(true);
                    }
                }
                if (!beforeCheck && mIsBeingDragged) {
                    //let children has one chance to catch the touch, and request the swipe not intercept
                    //useful when swipeLayout wrap a swipeLayout or other gestural layout
                    return false;
                }
                break;

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                mIsBeingDragged = false;
                mDragHelper.processTouchEvent(ev);
                break;
            default://handle other action, such as ACTION_POINTER_DOWN/UP
                mDragHelper.processTouchEvent(ev);
        }
        return mIsBeingDragged;
    }

    private float sX = -1, sY = -1;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isSwipeEnabled()) return super.onTouchEvent(event);

        int action = event.getActionMasked();
        gestureDetector.onTouchEvent(event);

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mDragHelper.processTouchEvent(event);
                sX = event.getRawX();
                sY = event.getRawY();


            case MotionEvent.ACTION_MOVE: {
                //the drag state and the direction are already judged at onInterceptTouchEvent
                checkCanDrag(event);
                if (mIsBeingDragged) {
                    getParent().requestDisallowInterceptTouchEvent(true);
                    mDragHelper.processTouchEvent(event);
                }
                break;
            }
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mIsBeingDragged = false;
                mDragHelper.processTouchEvent(event);
                break;

            default://handle other action, such as ACTION_POINTER_DOWN/UP
                mDragHelper.processTouchEvent(event);
        }

        return super.onTouchEvent(event) || mIsBeingDragged || action == MotionEvent.ACTION_DOWN;
    }

    public boolean isClickToClose() {
        return mClickToClose;
    }

    public void setClickToClose(boolean mClickToClose) {
        this.mClickToClose = mClickToClose;
    }

    public void setSwipeEnabled(boolean enabled) {
        mSwipeEnabled = enabled;
    }

    public boolean isSwipeEnabled() {
        return mSwipeEnabled;
    }

    public boolean isLeftSwipeEnabled() {
        View bottomView = mDragEdges.get(DragEdge.Left);
        return bottomView != null && bottomView.getParent() == this
                && bottomView != getSurfaceView() && mSwipesEnabled[DragEdge.Left.ordinal()];
    }

    public void setLeftSwipeEnabled(boolean leftSwipeEnabled) {
        this.mSwipesEnabled[DragEdge.Left.ordinal()] = leftSwipeEnabled;
    }

    public boolean isRightSwipeEnabled() {
        View bottomView = mDragEdges.get(DragEdge.Right);
        return bottomView != null && bottomView.getParent() == this
                && bottomView != getSurfaceView() && mSwipesEnabled[DragEdge.Right.ordinal()];
    }

    public void setRightSwipeEnabled(boolean rightSwipeEnabled) {
        this.mSwipesEnabled[DragEdge.Right.ordinal()] = rightSwipeEnabled;
    }

    public boolean isTopSwipeEnabled() {
        View bottomView = mDragEdges.get(DragEdge.Top);
        return bottomView != null && bottomView.getParent() == this
                && bottomView != getSurfaceView() && mSwipesEnabled[DragEdge.Top.ordinal()];
    }

    public void setTopSwipeEnabled(boolean topSwipeEnabled) {
        this.mSwipesEnabled[DragEdge.Top.ordinal()] = topSwipeEnabled;
    }

    public boolean isBottomSwipeEnabled() {
        View bottomView = mDragEdges.get(DragEdge.Bottom);
        return bottomView != null && bottomView.getParent() == this
                && bottomView != getSurfaceView() && mSwipesEnabled[DragEdge.Bottom.ordinal()];
    }

    public void setBottomSwipeEnabled(boolean bottomSwipeEnabled) {
        this.mSwipesEnabled[DragEdge.Bottom.ordinal()] = bottomSwipeEnabled;
    }

    /***
     * Returns the percentage of revealing at which the view below should the view finish opening
     * if it was already open before dragging
     *
     * @returns The percentage of view revealed to trigger, default value is 0.25
     */
    public float getWillOpenPercentAfterOpen() {
        return mWillOpenPercentAfterOpen;
    }

    /***
     * Allows to stablish at what percentage of revealing the view below should the view finish opening
     * if it was already open before dragging
     *
     * @param willOpenPercentAfterOpen The percentage of view revealed to trigger, default value is 0.25
     */
    public void setWillOpenPercentAfterOpen(float willOpenPercentAfterOpen) {
        this.mWillOpenPercentAfterOpen = willOpenPercentAfterOpen;
    }

    /***
     * Returns the percentage of revealing at which the view below should the view finish opening
     * if it was already closed before dragging
     *
     * @returns The percentage of view revealed to trigger, default value is 0.25
     */
    public float getWillOpenPercentAfterClose() {
        return mWillOpenPercentAfterClose;
    }

    /***
     * Allows to stablish at what percentage of revealing the view below should the view finish opening
     * if it was already closed before dragging
     *
     * @param willOpenPercentAfterClose The percentage of view revealed to trigger, default value is 0.75
     */
    public void setWillOpenPercentAfterClose(float willOpenPercentAfterClose) {
        this.mWillOpenPercentAfterClose = willOpenPercentAfterClose;
    }

    private boolean insideAdapterView() {
        return getAdapterView() != null;
    }

    private AdapterView getAdapterView() {
        ViewParent t = getParent();
        if (t instanceof AdapterView) {
            return (AdapterView) t;
        }
        return null;
    }

    private void performAdapterViewItemClick() {
        if (getOpenStatus() != Status.Close) return;
        ViewParent t = getParent();
        if (t instanceof AdapterView) {
            AdapterView view = (AdapterView) t;
            int p = view.getPositionForView(SwipeLayout.this);
            if (p != AdapterView.INVALID_POSITION) {
                view.performItemClick(view.getChildAt(p - view.getFirstVisiblePosition()), p, view
                        .getAdapter().getItemId(p));
            }
        }
    }

    private boolean performAdapterViewItemLongClick() {
        if (getOpenStatus() != Status.Close) return false;
        ViewParent t = getParent();
        if (t instanceof AdapterView) {
            AdapterView view = (AdapterView) t;
            int p = view.getPositionForView(SwipeLayout.this);
            if (p == AdapterView.INVALID_POSITION) return false;
            long vId = view.getItemIdAtPosition(p);
            boolean handled = false;
            try {
                Method m = AbsListView.class.getDeclaredMethod("performLongPress", View.class, int.class, long.class);
                m.setAccessible(true);
                handled = (boolean) m.invoke(view, SwipeLayout.this, p, vId);

            } catch (Exception e) {
                e.printStackTrace();

                if (view.getOnItemLongClickListener() != null) {
                    handled = view.getOnItemLongClickListener().onItemLongClick(view, SwipeLayout.this, p, vId);
                }
                if (handled) {
                    view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
                }
            }
            return handled;
        }
        return false;
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (insideAdapterView()) {
            if (clickListener == null) {
                setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        performAdapterViewItemClick();
                    }
                });
            }
            if (longClickListener == null) {
                setOnLongClickListener(new OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        performAdapterViewItemLongClick();
                        return true;
                    }
                });
            }
        }
    }

    OnClickListener clickListener;

    @Override
    public void setOnClickListener(OnClickListener l) {
        super.setOnClickListener(l);
        clickListener = l;
    }

    OnLongClickListener longClickListener;

    @Override
    public void setOnLongClickListener(OnLongClickListener l) {
        super.setOnLongClickListener(l);
        longClickListener = l;
    }

    private Rect hitSurfaceRect;

    private boolean isTouchOnSurface(MotionEvent ev) {
        View surfaceView = getSurfaceView();
        if (surfaceView == null) {
            return false;
        }
        if (hitSurfaceRect == null) {
            hitSurfaceRect = new Rect();
        }
        surfaceView.getHitRect(hitSurfaceRect);
        return hitSurfaceRect.contains((int) ev.getX(), (int) ev.getY());
    }

    private GestureDetector gestureDetector = new GestureDetector(getContext(), new SwipeDetector());

    class SwipeDetector extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            if (mClickToClose && isTouchOnSurface(e)) {
                close();
            }
            return super.onSingleTapUp(e);
        }

        @Override
        public boolean onDoubleTap(MotionEvent e) {
            if (mDoubleClickListener != null) {
                View target;
                View bottom = getCurrentBottomView();
                View surface = getSurfaceView();
                if (bottom != null && e.getX() > bottom.getLeft() && e.getX() < bottom.getRight()
                        && e.getY() > bottom.getTop() && e.getY() < bottom.getBottom()) {
                    target = bottom;
                } else {
                    target = surface;
                }
                mDoubleClickListener.onDoubleClick(SwipeLayout.this, target == surface);
            }
            return true;
        }
    }

    /**
     * set the drag distance, it will force set the bottom view's width or
     * height via this value.
     *
     * @param max max distance in dp unit
     */
    public void setDragDistance(int max) {
        if (max < 0) max = 0;
        mDragDistance = dp2px(max);
        requestLayout();
    }

    /**
     * There are 2 diffirent show mode.
     * {@link com.daimajia.swipe.SwipeLayout.ShowMode}.PullOut and
     * {@link com.daimajia.swipe.SwipeLayout.ShowMode}.LayDown.
     *
     * @param mode
     */
    public void setShowMode(ShowMode mode) {
        mShowMode = mode;
        requestLayout();
    }

    public DragEdge getDragEdge() {
        return mCurrentDragEdge;
    }

    public int getDragDistance() {
        return mDragDistance;
    }

    public ShowMode getShowMode() {
        return mShowMode;
    }

    /**
     * return null if there is no surface view(no children)
     */
    public View getSurfaceView() {
        if (getChildCount() == 0) return null;
        return getChildAt(getChildCount() - 1);
    }

    /**
     * return null if there is no bottom view
     */
    public View getCurrentBottomView() {
        List<View> bottoms = getBottomViews();
        if (mCurrentDragEdge.ordinal() < bottoms.size()) {
            return bottoms.get(mCurrentDragEdge.ordinal());
        }
        return null;
    }

    /**
     * @return all bottomViews: left, top, right, bottom (may null if the edge is not set)
     */
    public List<View> getBottomViews() {
        ArrayList<View> bottoms = new ArrayList<View>();
        for (DragEdge dragEdge : DragEdge.values()) {
            bottoms.add(mDragEdges.get(dragEdge));
        }
        return bottoms;
    }

    public enum Status {
        Middle,
        Open,
        Close
    }

    /**
     * get the open status.
     *
     * @return {@link com.daimajia.swipe.SwipeLayout.Status} Open , Close or
     * Middle.
     */
    public Status getOpenStatus() {
        View surfaceView = getSurfaceView();
        if (surfaceView == null) {
            return Status.Close;
        }
        int surfaceLeft = surfaceView.getLeft();
        int surfaceTop = surfaceView.getTop();
        if (surfaceLeft == getPaddingLeft() && surfaceTop == getPaddingTop()) return Status.Close;

        if (surfaceLeft == (getPaddingLeft() - mDragDistance) || surfaceLeft == (getPaddingLeft() + mDragDistance)
                || surfaceTop == (getPaddingTop() - mDragDistance) || surfaceTop == (getPaddingTop() + mDragDistance))
            return Status.Open;

        return Status.Middle;
    }


    /**
     * Process the surface release event.
     *
     * @param xvel                 xVelocity
     * @param yvel                 yVelocity
     * @param isCloseBeforeDragged the open state before drag
     */
    protected void processHandRelease(float xvel, float yvel, boolean isCloseBeforeDragged) {
        float minVelocity = mDragHelper.getMinVelocity();
        View surfaceView = getSurfaceView();
        DragEdge currentDragEdge = mCurrentDragEdge;
        if (currentDragEdge == null || surfaceView == null) {
            return;
        }
        float willOpenPercent = (isCloseBeforeDragged ? mWillOpenPercentAfterClose : mWillOpenPercentAfterOpen);
        if (currentDragEdge == DragEdge.Left) {
            if (xvel > minVelocity) open();
            else if (xvel < -minVelocity) close();
            else {
                float openPercent = 1f * getSurfaceView().getLeft() / mDragDistance;
                if (openPercent > willOpenPercent) open();
                else close();
            }
        } else if (currentDragEdge == DragEdge.Right) {
            if (xvel > minVelocity) close();
            else if (xvel < -minVelocity) open();
            else {
                float openPercent = 1f * (-getSurfaceView().getLeft()) / mDragDistance;
                if (openPercent > willOpenPercent) open();
                else close();
            }
        } else if (currentDragEdge == DragEdge.Top) {
            if (yvel > minVelocity) open();
            else if (yvel < -minVelocity) close();
            else {
                float openPercent = 1f * getSurfaceView().getTop() / mDragDistance;
                if (openPercent > willOpenPercent) open();
                else close();
            }
        } else if (currentDragEdge == DragEdge.Bottom) {
            if (yvel > minVelocity) close();
            else if (yvel < -minVelocity) open();
            else {
                float openPercent = 1f * (-getSurfaceView().getTop()) / mDragDistance;
                if (openPercent > willOpenPercent) open();
                else close();
            }
        }
    }

    /**
     * smoothly open surface.
     */
    public void open() {
        open(true, true);
    }

    public void open(boolean smooth) {
        open(smooth, true);
    }

    public void open(boolean smooth, boolean notify) {
        View surface = getSurfaceView(), bottom = getCurrentBottomView();
        if (surface == null) {
            return;
        }
        int dx, dy;
        Rect rect = computeSurfaceLayoutArea(true);
        if (smooth) {
            mDragHelper.smoothSlideViewTo(surface, rect.left, rect.top);
        } else {
            dx = rect.left - surface.getLeft();
            dy = rect.top - surface.getTop();
            surface.layout(rect.left, rect.top, rect.right, rect.bottom);
            if (getShowMode() == ShowMode.PullOut) {
                Rect bRect = computeBottomLayoutAreaViaSurface(ShowMode.PullOut, rect);
                if (bottom != null) {
                    bottom.layout(bRect.left, bRect.top, bRect.right, bRect.bottom);
                }
            }
            if (notify) {
                dispatchRevealEvent(rect.left, rect.top, rect.right, rect.bottom);
                dispatchSwipeEvent(rect.left, rect.top, dx, dy);
            } else {
                safeBottomView();
            }
        }
        invalidate();
    }

    public void open(DragEdge edge) {
        setCurrentDragEdge(edge);
        open(true, true);
    }

    public void open(boolean smooth, DragEdge edge) {
        setCurrentDragEdge(edge);
        open(smooth, true);
    }

    public void open(boolean smooth, boolean notify, DragEdge edge) {
        setCurrentDragEdge(edge);
        open(smooth, notify);
    }

    /**
     * smoothly close surface.
     */
    public void close() {
        close(true, true);
    }

    public void close(boolean smooth) {
        close(smooth, true);
    }

    /**
     * close surface
     *
     * @param smooth smoothly or not.
     * @param notify if notify all the listeners.
     */
    public void close(boolean smooth, boolean notify) {
        View surface = getSurfaceView();
        if (surface == null) {
            return;
        }
        int dx, dy;
        if (smooth)
            mDragHelper.smoothSlideViewTo(getSurfaceView(), getPaddingLeft(), getPaddingTop());
        else {
            Rect rect = computeSurfaceLayoutArea(false);
            dx = rect.left - surface.getLeft();
            dy = rect.top - surface.getTop();
            surface.layout(rect.left, rect.top, rect.right, rect.bottom);
            if (notify) {
                dispatchRevealEvent(rect.left, rect.top, rect.right, rect.bottom);
                dispatchSwipeEvent(rect.left, rect.top, dx, dy);
            } else {
                safeBottomView();
            }
        }
        invalidate();
    }

    public void toggle() {
        toggle(true);
    }

    public void toggle(boolean smooth) {
        if (getOpenStatus() == Status.Open)
            close(smooth);
        else if (getOpenStatus() == Status.Close) open(smooth);
    }


    /**
     * a helper function to compute the Rect area that surface will hold in.
     *
     * @param open open status or close status.
     */
    private Rect computeSurfaceLayoutArea(boolean open) {
        int l = getPaddingLeft(), t = getPaddingTop();
        if (open) {
            if (mCurrentDragEdge == DragEdge.Left)
                l = getPaddingLeft() + mDragDistance;
            else if (mCurrentDragEdge == DragEdge.Right)
                l = getPaddingLeft() - mDragDistance;
            else if (mCurrentDragEdge == DragEdge.Top)
                t = getPaddingTop() + mDragDistance;
            else t = getPaddingTop() - mDragDistance;
        }
        return new Rect(l, t, l + getMeasuredWidth(), t + getMeasuredHeight());
    }

    private Rect computeBottomLayoutAreaViaSurface(ShowMode mode, Rect surfaceArea) {
        Rect rect = surfaceArea;
        View bottomView = getCurrentBottomView();

        int bl = rect.left, bt = rect.top, br = rect.right, bb = rect.bottom;
        if (mode == ShowMode.PullOut) {
            if (mCurrentDragEdge == DragEdge.Left)
                bl = rect.left - mDragDistance;
            else if (mCurrentDragEdge == DragEdge.Right)
                bl = rect.right;
            else if (mCurrentDragEdge == DragEdge.Top)
                bt = rect.top - mDragDistance;
            else bt = rect.bottom;

            if (mCurrentDragEdge == DragEdge.Left || mCurrentDragEdge == DragEdge.Right) {
                bb = rect.bottom;
                br = bl + (bottomView == null ? 0 : bottomView.getMeasuredWidth());
            } else {
                bb = bt + (bottomView == null ? 0 : bottomView.getMeasuredHeight());
                br = rect.right;
            }
        } else if (mode == ShowMode.LayDown) {
            if (mCurrentDragEdge == DragEdge.Left)
                br = bl + mDragDistance;
            else if (mCurrentDragEdge == DragEdge.Right)
                bl = br - mDragDistance;
            else if (mCurrentDragEdge == DragEdge.Top)
                bb = bt + mDragDistance;
            else bt = bb - mDragDistance;

        }
        return new Rect(bl, bt, br, bb);

    }

    private Rect computeBottomLayDown(DragEdge dragEdge) {
        int bl = getPaddingLeft(), bt = getPaddingTop();
        int br, bb;
        if (dragEdge == DragEdge.Right) {
            bl = getMeasuredWidth() - mDragDistance;
        } else if (dragEdge == DragEdge.Bottom) {
            bt = getMeasuredHeight() - mDragDistance;
        }
        if (dragEdge == DragEdge.Left || dragEdge == DragEdge.Right) {
            br = bl + mDragDistance;
            bb = bt + getMeasuredHeight();
        } else {
            br = bl + getMeasuredWidth();
            bb = bt + mDragDistance;
        }
        return new Rect(bl, bt, br, bb);
    }

    public void setOnDoubleClickListener(DoubleClickListener doubleClickListener) {
        mDoubleClickListener = doubleClickListener;
    }

    public interface DoubleClickListener {
        void onDoubleClick(SwipeLayout layout, boolean surface);
    }

    private int dp2px(float dp) {
        return (int) (dp * getContext().getResources().getDisplayMetrics().density + 0.5f);
    }


    /**
     * Deprecated, use {@link #setDrag(DragEdge, View)}
     */
    @Deprecated
    public void setDragEdge(DragEdge dragEdge) {
        clearDragEdge();
        if (getChildCount() >= 2) {
            mDragEdges.put(dragEdge, getChildAt(getChildCount() - 2));
        }
        setCurrentDragEdge(dragEdge);
    }

    public void onViewRemoved(View child) {
        for (Map.Entry<DragEdge, View> entry : new HashMap<DragEdge, View>(mDragEdges).entrySet()) {
            if (entry.getValue() == child) {
                mDragEdges.remove(entry.getKey());
            }
        }
    }

    public Map<DragEdge, View> getDragEdgeMap() {
        return mDragEdges;
    }

    /**
     * Deprecated, use {@link #getDragEdgeMap()}
     */
    @Deprecated
    public List<DragEdge> getDragEdges() {
        return new ArrayList<DragEdge>(mDragEdges.keySet());
    }

    /**
     * Deprecated, use {@link #setDrag(DragEdge, View)}
     */
    @Deprecated
    public void setDragEdges(List<DragEdge> dragEdges) {
        clearDragEdge();
        for (int i = 0, size = Math.min(dragEdges.size(), getChildCount() - 1); i < size; i++) {
            DragEdge dragEdge = dragEdges.get(i);
            mDragEdges.put(dragEdge, getChildAt(i));
        }
        if (dragEdges.size() == 0 || dragEdges.contains(DefaultDragEdge)) {
            setCurrentDragEdge(DefaultDragEdge);
        } else {
            setCurrentDragEdge(dragEdges.get(0));
        }
    }

    /**
     * Deprecated, use {@link #addDrag(DragEdge, View)}
     */
    @Deprecated
    public void setDragEdges(DragEdge... mDragEdges) {
        clearDragEdge();
        setDragEdges(Arrays.asList(mDragEdges));
    }

    /**
     * Deprecated, use {@link #addDrag(DragEdge, View)}
     * When using multiple drag edges it's a good idea to pass the ids of the views that
     * you're using for the left, right, top bottom views (-1 if you're not using a particular view)
     */
    @Deprecated
    public void setBottomViewIds(int leftId, int rightId, int topId, int bottomId) {
        addDrag(DragEdge.Left, findViewById(leftId));
        addDrag(DragEdge.Right, findViewById(rightId));
        addDrag(DragEdge.Top, findViewById(topId));
        addDrag(DragEdge.Bottom, findViewById(bottomId));
    }

    private float getCurrentOffset() {
        if (mCurrentDragEdge == null) return 0;
        return mEdgeSwipesOffset[mCurrentDragEdge.ordinal()];
    }

    private void setCurrentDragEdge(DragEdge dragEdge) {
        mCurrentDragEdge = dragEdge;
        updateBottomViews();
    }

    private void updateBottomViews() {
        View currentBottomView = getCurrentBottomView();
        if (currentBottomView != null) {
            if (mCurrentDragEdge == DragEdge.Left || mCurrentDragEdge == DragEdge.Right) {
                mDragDistance = currentBottomView.getMeasuredWidth() - dp2px(getCurrentOffset());
            } else {
                mDragDistance = currentBottomView.getMeasuredHeight() - dp2px(getCurrentOffset());
            }
        }

        if (mShowMode == ShowMode.PullOut) {
            layoutPullOut();
        } else if (mShowMode == ShowMode.LayDown) {
            layoutLayDown();
        }

        safeBottomView();
    }
}
public void addRevealListener ( int [ ] childIds , OnRevealListener l ) { for ( int i : childIds ) addRevealListener ( i , l ) ; } public void removeRevealListener ( int childId , OnRevealListener l ) { View child = findViewById ( childId ) ; if ( child == null ) return ; mShowEntirely . remove ( child ) ; if ( mRevealListeners . containsKey ( child ) ) mRevealListeners . get ( child ) . remove ( l ) ; } public void removeAllRevealListeners ( int childId ) { View child = findViewById ( childId ) ; if ( child != null ) { mRevealListeners . remove ( child ) ; mShowEntirely . remove ( child ) ; } } private ViewDragHelper . Callback mDragHelperCallback = new ViewDragHelper . Callback ( ) { @ Override public int clampViewPositionHorizontal ( View child , int left , int dx ) { if ( child == getSurfaceView ( ) ) { switch ( mCurrentDragEdge ) { case Top : case Bottom : return getPaddingLeft ( ) ; case Left : if ( left < getPaddingLeft ( ) ) return getPaddingLeft ( ) ; if ( left > getPaddingLeft ( ) + mDragDistance ) return getPaddingLeft ( ) + mDragDistance ; break ; case Right : if ( left > getPaddingLeft ( ) ) return getPaddingLeft ( ) ; if ( left < getPaddingLeft ( ) - mDragDistance ) return getPaddingLeft ( ) - mDragDistance ; break ; } } else if ( getCurrentBottomView ( ) == child ) { switch ( mCurrentDragEdge ) { case Top : case Bottom : return getPaddingLeft ( ) ; case Left : if ( mShowMode == ShowMode . PullOut ) { if ( left > getPaddingLeft ( ) ) return getPaddingLeft ( ) ; } break ; case Right : if ( mShowMode == ShowMode . PullOut ) { if ( left < getMeasuredWidth ( ) - mDragDistance ) { return getMeasuredWidth ( ) - mDragDistance ; } } break ; } } return left ; } @ Override public int clampViewPositionVertical ( View child , int top , int dy ) { if ( child == getSurfaceView ( ) ) { switch ( mCurrentDragEdge ) { case Left : case Right : return getPaddingTop ( ) ; case Top : if ( top < getPaddingTop ( ) ) return getPaddingTop ( ) ; if ( top > getPaddingTop ( ) + mDragDistance ) return getPaddingTop ( ) + mDragDistance ; break ; case Bottom : if ( top < getPaddingTop ( ) - mDragDistance ) { return getPaddingTop ( ) - mDragDistance ; } if ( top > getPaddingTop ( ) ) { return getPaddingTop ( ) ; } } } else { View surfaceView = getSurfaceView ( ) ; int surfaceViewTop = surfaceView == null ? 0 : surfaceView . getTop ( ) ; switch ( mCurrentDragEdge ) { case Left : case Right : return getPaddingTop ( ) ; case Top : if ( mShowMode == ShowMode . PullOut ) { if ( top > getPaddingTop ( ) ) return getPaddingTop ( ) ; } else { if ( surfaceViewTop + dy < getPaddingTop ( ) ) return getPaddingTop ( ) ; if ( surfaceViewTop + dy > getPaddingTop ( ) + mDragDistance ) return getPaddingTop ( ) + mDragDistance ; } break ; case Bottom : if ( mShowMode == ShowMode . PullOut ) { if ( top < getMeasuredHeight ( ) - mDragDistance ) return getMeasuredHeight ( ) - mDragDistance ; } else { if ( surfaceViewTop + dy >= getPaddingTop ( ) ) return getPaddingTop ( ) ; if ( surfaceViewTop + dy <= getPaddingTop ( ) - mDragDistance ) return getPaddingTop ( ) - mDragDistance ; } } } return top ; } @ Override public boolean tryCaptureView ( View child , int pointerId ) { boolean result = child == getSurfaceView ( ) || getBottomViews ( ) . contains ( child ) ; if ( result ) { isCloseBeforeDrag = getOpenStatus ( ) == Status . Close ; } return result ; } @ Override public int getViewHorizontalDragRange ( View child ) { return mDragDistance ; } @ Override public int getViewVerticalDragRange ( View child ) { return mDragDistance ; } boolean isCloseBeforeDrag = true ; @ Override public void onViewReleased ( View releasedChild , float xvel , float yvel ) { super . onViewReleased ( releasedChild , xvel , yvel ) ; processHandRelease ( xvel , yvel , isCloseBeforeDrag ) ; for ( SwipeListener l : mSwipeListeners ) { l . onHandRelease ( SwipeLayout . this , xvel , yvel ) ; } invalidate ( ) ; } @ Override public void onViewPositionChanged ( View changedView , int left , int top , int dx , int dy ) { View surfaceView = getSurfaceView ( ) ; if ( surfaceView == null ) return ; View currentBottomView = getCurrentBottomView ( ) ; int evLeft = surfaceView . getLeft ( ) , evRight = surfaceView . getRight ( ) , evTop = surfaceView . getTop ( ) , evBottom = surfaceView . getBottom ( ) ; if ( changedView == surfaceView ) { if ( mShowMode == ShowMode . PullOut && currentBottomView != null ) { if ( mCurrentDragEdge == DragEdge . Left || mCurrentDragEdge == DragEdge . Right ) { currentBottomView . offsetLeftAndRight ( dx ) ; } else { currentBottomView . offsetTopAndBottom ( dy ) ; } } } else if ( getBottomViews ( ) . contains ( changedView ) ) { if ( mShowMode == ShowMode . PullOut ) { surfaceView . offsetLeftAndRight ( dx ) ; surfaceView . offsetTopAndBottom ( dy ) ; } else { Rect rect = computeBottomLayDown ( mCurrentDragEdge ) ; if ( currentBottomView != null ) { currentBottomView . layout ( rect . left , rect . top , rect . right , rect . bottom ) ; } int newLeft = surfaceView . getLeft ( ) + dx , newTop = surfaceView . getTop ( ) + dy ; if ( mCurrentDragEdge == DragEdge . Left && newLeft < getPaddingLeft ( ) ) newLeft = getPaddingLeft ( ) ; else if ( mCurrentDragEdge == DragEdge . Right && newLeft > getPaddingLeft ( ) ) newLeft = getPaddingLeft ( ) ; else if ( mCurrentDragEdge == DragEdge . Top && newTop < getPaddingTop ( ) ) newTop = getPaddingTop ( ) ; else if ( mCurrentDragEdge == DragEdge . Bottom && newTop > getPaddingTop ( ) ) newTop = getPaddingTop ( ) ; surfaceView . layout ( newLeft , newTop , newLeft + getMeasuredWidth ( ) , newTop + getMeasuredHeight ( ) ) ; } } dispatchRevealEvent ( evLeft , evTop , evRight , evBottom ) ; dispatchSwipeEvent ( evLeft , evTop , dx , dy ) ; invalidate ( ) ; captureChildrenBound ( ) ; } } ; private void captureChildrenBound ( ) { View currentBottomView = getCurrentBottomView ( ) ; if ( getOpenStatus ( ) == Status . Close ) { mViewBoundCache . remove ( currentBottomView ) ; return ; } View [ ] views = new View [ ] { getSurfaceView ( ) , currentBottomView } ; for ( View child : views ) { Rect rect = mViewBoundCache . get ( child ) ; if ( rect == null ) { rect = new Rect ( ) ; mViewBoundCache . put ( child , rect ) ; } rect . left = child . getLeft ( ) ; rect . top = child . getTop ( ) ; rect . right = child . getRight ( ) ; rect . bottom = child . getBottom ( ) ; } } protected boolean isViewTotallyFirstShowed ( View child , Rect relativePosition , DragEdge edge , int surfaceLeft , int surfaceTop , int surfaceRight , int surfaceBottom ) { if ( mShowEntirely . get ( child ) ) return false ; int childLeft = relativePosition . left ; int childRight = relativePosition . right ; int childTop = relativePosition . top ; int childBottom = relativePosition . bottom ; boolean r = false ; if ( getShowMode ( ) == ShowMode . LayDown ) { if ( ( edge == DragEdge . Right && surfaceRight <= childLeft ) || ( edge == DragEdge . Left && surfaceLeft >= childRight ) || ( edge == DragEdge . Top && surfaceTop >= childBottom ) || ( edge == DragEdge . Bottom && surfaceBottom <= childTop ) ) r = true ; } else if ( getShowMode ( ) == ShowMode . PullOut ) { if ( ( edge == DragEdge . Right && childRight <= getWidth ( ) ) || ( edge == DragEdge . Left && childLeft >= getPaddingLeft ( ) ) || ( edge == DragEdge . Top && childTop >= getPaddingTop ( ) ) || ( edge == DragEdge . Bottom && childBottom <= getHeight ( ) ) ) r = true ; } return r ; } protected boolean isViewShowing ( View child , Rect relativePosition , DragEdge availableEdge , int surfaceLeft , int surfaceTop , int surfaceRight , int surfaceBottom ) { int childLeft = relativePosition . left ; int childRight = relativePosition . right ; int childTop = relativePosition . top ; int childBottom = relativePosition . bottom ; if ( getShowMode ( ) == ShowMode . LayDown ) { switch ( availableEdge ) { case Right : if ( surfaceRight > childLeft && surfaceRight <= childRight ) { return true ; } break ; case Left : if ( surfaceLeft < childRight && surfaceLeft >= childLeft ) { return true ; } break ; case Top : if ( surfaceTop >= childTop && surfaceTop < childBottom ) { return true ; } break ; case Bottom : if ( surfaceBottom > childTop && surfaceBottom <= childBottom ) { return true ; } break ; } } else if ( getShowMode ( ) == ShowMode . PullOut ) { switch ( availableEdge ) { case Right : if ( childLeft <= getWidth ( ) && childRight > getWidth ( ) ) return true ; break ; case Left : if ( childRight >= getPaddingLeft ( ) && childLeft < getPaddingLeft ( ) ) return true ; break ; case Top : if ( childTop < getPaddingTop ( ) && childBottom >= getPaddingTop ( ) ) return true ; break ; case Bottom : if ( childTop < getHeight ( ) && childTop >= getPaddingTop ( ) ) return true ; break ; } } return false ; } protected Rect getRelativePosition ( View child ) { View t = child ; Rect r = new Rect ( t . getLeft ( ) , t . getTop ( ) , 0 , 0 ) ; while ( t . getParent ( ) != null && t != getRootView ( ) ) { t = ( View ) t . getParent ( ) ; if ( t == this ) break ; r . left += t . getLeft ( ) ; r . top += t . getTop ( ) ; } r . right = r . left + child . getMeasuredWidth ( ) ; r . bottom = r . top + child . getMeasuredHeight ( ) ; return r ; } private int mEventCounter = 0 ; protected void dispatchSwipeEvent ( int surfaceLeft , int surfaceTop , int dx , int dy ) { DragEdge edge = getDragEdge ( ) ; boolean open = true ; if ( edge == DragEdge . Left ) { if ( dx < 0 ) open = false ; } else if ( edge == DragEdge . Right ) { if ( dx > 0 ) open = false ; } else if ( edge == DragEdge . Top ) { if ( dy < 0 ) open = false ; } else if ( edge == DragEdge . Bottom ) { if ( dy > 0 ) open = false ; } dispatchSwipeEvent ( surfaceLeft , surfaceTop , open ) ; } protected void dispatchSwipeEvent ( int surfaceLeft , int surfaceTop , boolean open ) { safeBottomView ( ) ; Status status = getOpenStatus ( ) ; if ( ! mSwipeListeners . isEmpty ( ) ) { mEventCounter ++ ; for ( SwipeListener l : mSwipeListeners ) { if ( mEventCounter == 1 ) { if ( open ) { l . onStartOpen ( this ) ; } else { l . onStartClose ( this ) ; } } l . onUpdate ( SwipeLayout . this , surfaceLeft - getPaddingLeft ( ) , surfaceTop - getPaddingTop ( ) ) ; } if ( status == Status . Close ) { for ( SwipeListener l : mSwipeListeners ) { l . onClose ( SwipeLayout . this ) ; } mEventCounter = 0 ; } if ( status == Status . Open ) { View currentBottomView = getCurrentBottomView ( ) ; if ( currentBottomView != null ) { currentBottomView . setEnabled ( true ) ; } for ( SwipeListener l : mSwipeListeners ) { l . onOpen ( SwipeLayout . this ) ; } mEventCounter = 0 ; } } } private void safeBottomView ( ) { Status status = getOpenStatus ( ) ; List < View > bottoms = getBottomViews ( ) ; if ( status == Status . Close ) { for ( View bottom : bottoms ) { if ( bottom != null && bottom . getVisibility ( ) != INVISIBLE ) { bottom . setVisibility ( INVISIBLE ) ; } } } else { View currentBottomView = getCurrentBottomView ( ) ; if ( currentBottomView != null && currentBottomView . getVisibility ( ) != VISIBLE ) { currentBottomView . setVisibility ( VISIBLE ) ; } } } protected void dispatchRevealEvent ( final int surfaceLeft , final int surfaceTop , final int surfaceRight , final int surfaceBottom ) { if ( mRevealListeners . isEmpty ( ) ) return ; for ( Map . Entry < View , ArrayList < OnRevealListener > > entry : mRevealListeners . entrySet ( ) ) { View child = entry . getKey ( ) ; Rect rect = getRelativePosition ( child ) ; if ( isViewShowing ( child , rect , mCurrentDragEdge , surfaceLeft , surfaceTop , surfaceRight , surfaceBottom ) ) { mShowEntirely . put ( child , false ) ; int distance = 0 ; float fraction = 0f ; if ( getShowMode ( ) == ShowMode . LayDown ) { switch ( mCurrentDragEdge ) { case Left : distance = rect . left - surfaceLeft ; fraction = distance / ( float ) child . getWidth ( ) ; break ; case Right : distance = rect . right - surfaceRight ; fraction = distance / ( float ) child . getWidth ( ) ; break ; case Top : distance = rect . top - surfaceTop ; fraction = distance / ( float ) child . getHeight ( ) ; break ; case Bottom : distance = rect . bottom - surfaceBottom ; fraction = distance / ( float ) child . getHeight ( ) ; break ; } } else if ( getShowMode ( ) == ShowMode . PullOut ) { switch ( mCurrentDragEdge ) { case Left : distance = rect . right - getPaddingLeft ( ) ; fraction = distance / ( float ) child . getWidth ( ) ; break ; case Right : distance = rect . left - getWidth ( ) ; fraction = distance / ( float ) child . getWidth ( ) ; break ; case Top : distance = rect . bottom - getPaddingTop ( ) ; fraction = distance / ( float ) child . getHeight ( ) ; break ; case Bottom : distance = rect . top - getHeight ( ) ; fraction = distance / ( float ) child . getHeight ( ) ; break ; } } for ( OnRevealListener l : entry . getValue ( ) ) { l . onReveal ( child , mCurrentDragEdge , Math . abs ( fraction ) , distance ) ; if ( Math . abs ( fraction ) == 1 ) { mShowEntirely . put ( child , true ) ; } } } if ( isViewTotallyFirstShowed ( child , rect , mCurrentDragEdge , surfaceLeft , surfaceTop , surfaceRight , surfaceBottom ) ) { mShowEntirely . put ( child , true ) ; for ( OnRevealListener l : entry . getValue ( ) ) { if ( mCurrentDragEdge == DragEdge . Left || mCurrentDragEdge == DragEdge . Right ) l . onReveal ( child , mCurrentDragEdge , 1 , child . getWidth ( ) ) ; else l . onReveal ( child , mCurrentDragEdge , 1 , child . getHeight ( ) ) ; } } } } @ Override public void computeScroll ( ) { super . computeScroll ( ) ; if ( mDragHelper . continueSettling ( true ) ) { ViewCompat . postInvalidateOnAnimation ( this ) ; } } public interface OnLayout { void onLayout ( SwipeLayout v ) ; } private List < OnLayout > mOnLayoutListeners ; public void addOnLayoutListener ( OnLayout l ) { if ( mOnLayoutListeners == null ) mOnLayoutListeners = new ArrayList < OnLayout > ( ) ; mOnLayoutListeners . add ( l ) ; } public void removeOnLayoutListener ( OnLayout l ) { if ( mOnLayoutListeners != null ) mOnLayoutListeners . remove ( l ) ; } public void clearDragEdge ( ) { mDragEdges . clear ( ) ; } public void setDrag ( DragEdge dragEdge , int childId ) { clearDragEdge ( ) ; addDrag ( dragEdge , childId ) ; } public void setDrag ( DragEdge dragEdge , View child ) { clearDragEdge ( ) ; addDrag ( dragEdge , child ) ; } public void addDrag ( DragEdge dragEdge , int childId ) { addDrag ( dragEdge , findViewById ( childId ) , null ) ; } public void addDrag ( DragEdge dragEdge , View child ) { addDrag ( dragEdge , child , null ) ; } public void addDrag ( DragEdge dragEdge , View child , ViewGroup . LayoutParams params ) { if ( child == null ) return ; if ( params == null ) { params = generateDefaultLayoutParams ( ) ; } if ( ! checkLayoutParams ( params ) ) { params = generateLayoutParams ( params ) ; } int gravity = - 1 ; switch ( dragEdge ) { case Left : gravity = Gravity . LEFT ; break ; case Right : gravity = Gravity . RIGHT ; break ; case Top : gravity = Gravity . TOP ; break ; case Bottom : gravity = Gravity . BOTTOM ; break ; } if ( params instanceof FrameLayout . LayoutParams ) { ( ( LayoutParams ) params ) . gravity = gravity ; } addView ( child , 0 , params ) ; } @ Override public void addView ( View child , int index , ViewGroup . LayoutParams params ) { if ( child == null ) return ; int gravity = Gravity . NO_GRAVITY ; try { gravity = ( Integer ) params . getClass ( ) . getField ( "gravity" ) . get ( params ) ; } catch ( Exception e ) { e . printStackTrace ( ) ; } if ( gravity > 0 ) { gravity = GravityCompat . getAbsoluteGravity ( gravity , ViewCompat . getLayoutDirection ( this ) ) ; if ( ( gravity & Gravity . LEFT ) == Gravity . LEFT ) { mDragEdges . put ( DragEdge . Left , child ) ; } if ( ( gravity & Gravity . RIGHT ) == Gravity . RIGHT ) { mDragEdges . put ( DragEdge . Right , child ) ; } if ( ( gravity & Gravity . TOP ) == Gravity . TOP ) { mDragEdges . put ( DragEdge . Top , child ) ; } if ( ( gravity & Gravity . BOTTOM ) == Gravity . BOTTOM ) { mDragEdges . put ( DragEdge . Bottom , child ) ; } } else { for ( Map . Entry < DragEdge , View > entry : mDragEdges . entrySet ( ) ) { if ( entry . getValue ( ) == null ) { mDragEdges . put ( entry . getKey ( ) , child ) ; break ; } } } if ( child . getParent ( ) == this ) { return ; } super . addView ( child , index , params ) ; } @ Override protected void onLayout ( boolean changed , int l , int t , int r , int b ) { updateBottomViews ( ) ; if ( mOnLayoutListeners != null ) for ( int i = 0 ; i < mOnLayoutListeners . size ( ) ; i ++ ) { mOnLayoutListeners . get ( i ) . onLayout ( this ) ; } } void layoutPullOut ( ) { View surfaceView = getSurfaceView ( ) ; Rect surfaceRect = mViewBoundCache . get ( surfaceView ) ; if ( surfaceRect == null ) surfaceRect = computeSurfaceLayoutArea ( false ) ; if ( surfaceView != null ) { surfaceView . layout ( surfaceRect . left , surfaceRect . top , surfaceRect . right , surfaceRect . bottom ) ; bringChildToFront ( surfaceView ) ; } View currentBottomView = getCurrentBottomView ( ) ; Rect bottomViewRect = mViewBoundCache . get ( currentBottomView ) ; if ( bottomViewRect == null ) bottomViewRect = computeBottomLayoutAreaViaSurface ( ShowMode . PullOut , surfaceRect ) ; if ( currentBottomView != null ) { currentBottomView . layout ( bottomViewRect . left , bottomViewRect . top , bottomViewRect . right , bottomViewRect . bottom ) ; } } void layoutLayDown ( ) { View surfaceView = getSurfaceView ( ) ; Rect surfaceRect = mViewBoundCache . get ( surfaceView ) ; if ( surfaceRect == null ) surfaceRect = computeSurfaceLayoutArea ( false ) ; if ( surfaceView != null ) { surfaceView . layout ( surfaceRect . left , surfaceRect . top , surfaceRect . right , surfaceRect . bottom ) ; bringChildToFront ( surfaceView ) ; } View currentBottomView = getCurrentBottomView ( ) ; Rect bottomViewRect = mViewBoundCache . get ( currentBottomView ) ; if ( bottomViewRect == null ) bottomViewRect = computeBottomLayoutAreaViaSurface ( ShowMode . LayDown , surfaceRect ) ; if ( currentBottomView != null ) { currentBottomView . layout ( bottomViewRect . left , bottomViewRect . top , bottomViewRect . right , bottomViewRect . bottom ) ; } } private boolean mIsBeingDragged ; private void checkCanDrag ( MotionEvent ev ) { if ( mIsBeingDragged ) return ; if ( getOpenStatus ( ) == Status . Middle ) { mIsBeingDragged = true ; return ; } Status status = getOpenStatus ( ) ; float distanceX = ev . getRawX ( ) - sX ; float distanceY = ev . getRawY ( ) - sY ; float angle = Math . abs ( distanceY / distanceX ) ; angle = ( float ) Math . toDegrees ( Math . atan ( angle ) ) ; if ( getOpenStatus ( ) == Status . Close ) { DragEdge dragEdge ; if ( angle < 45 ) { if ( distanceX > 0 && isLeftSwipeEnabled ( ) ) { dragEdge = DragEdge . Left ; } else if ( distanceX < 0 && isRightSwipeEnabled ( ) ) { dragEdge = DragEdge . Right ; } else return ; } else { if ( distanceY > 0 && isTopSwipeEnabled ( ) ) { dragEdge = DragEdge . Top ; } else if ( distanceY < 0 && isBottomSwipeEnabled ( ) ) { dragEdge = DragEdge . Bottom ; } else return ; } setCurrentDragEdge ( dragEdge ) ; } boolean doNothing = false ; if ( mCurrentDragEdge == DragEdge . Right ) { boolean suitable = ( status == Status . Open && distanceX > mTouchSlop ) || ( status == Status . Close && distanceX < - mTouchSlop ) ; suitable = suitable || ( status == Status . Middle ) ; if ( angle > 30 || ! suitable ) { doNothing = true ; } } if ( mCurrentDragEdge == DragEdge . Left ) { boolean suitable = ( status == Status . Open && distanceX < - mTouchSlop ) || ( status == Status . Close && distanceX > mTouchSlop ) ; suitable = suitable || status == Status . Middle ; if ( angle > 30 || ! suitable ) { doNothing = true ; } } if ( mCurrentDragEdge == DragEdge . Top ) { boolean suitable = ( status == Status . Open && distanceY < - mTouchSlop ) || ( status == Status . Close && distanceY > mTouchSlop ) ; suitable = suitable || status == Status . Middle ; if ( angle < 60 || ! suitable ) { doNothing = true ; } } if ( mCurrentDragEdge == DragEdge . Bottom ) { boolean suitable = ( status == Status . Open && distanceY > mTouchSlop ) || ( status == Status . Close && distanceY < - mTouchSlop ) ; suitable = suitable || status == Status . Middle ; if ( angle < 60 || ! suitable ) { doNothing = true ; } } mIsBeingDragged = ! doNothing ; } @ Override public boolean onInterceptTouchEvent ( MotionEvent ev ) { if ( ! isSwipeEnabled ( ) ) { return false ; } if ( mClickToClose && getOpenStatus ( ) == Status . Open && isTouchOnSurface ( ev ) ) { return true ; } for ( SwipeDenier denier : mSwipeDeniers ) { if ( denier != null && denier . shouldDenySwipe ( ev ) ) { return false ; } } switch ( ev . getAction ( ) ) { case MotionEvent . ACTION_DOWN : mDragHelper . processTouchEvent ( ev ) ; mIsBeingDragged = false ; sX = ev . getRawX ( ) ; sY = ev . getRawY ( ) ; if ( getOpenStatus ( ) == Status . Middle ) { mIsBeingDragged = true ; } break ; case MotionEvent . ACTION_MOVE : boolean beforeCheck = mIsBeingDragged ; checkCanDrag ( ev ) ; if ( mIsBeingDragged ) { ViewParent parent = getParent ( ) ; if ( parent != null ) { parent . requestDisallowInterceptTouchEvent ( true ) ; } } if ( ! beforeCheck && mIsBeingDragged ) { return false ; } break ; case MotionEvent . ACTION_CANCEL : case MotionEvent . ACTION_UP : mIsBeingDragged = false ; mDragHelper . processTouchEvent ( ev ) ; break ; default : mDragHelper . processTouchEvent ( ev ) ; } return mIsBeingDragged ; } private float sX = - 1 , sY = - 1 ; @ Override public boolean onTouchEvent ( MotionEvent event ) { if ( ! isSwipeEnabled ( ) ) return super . onTouchEvent ( event ) ; int action = event . getActionMasked ( ) ; gestureDetector . onTouchEvent ( event ) ; switch ( action ) { case MotionEvent . ACTION_DOWN : mDragHelper . processTouchEvent ( event ) ; sX = event . getRawX ( ) ; sY = event . getRawY ( ) ; case MotionEvent . ACTION_MOVE : { checkCanDrag ( event ) ; if ( mIsBeingDragged ) { getParent ( ) . requestDisallowInterceptTouchEvent ( true ) ; mDragHelper . processTouchEvent ( event ) ; } break ; } case MotionEvent . ACTION_UP : case MotionEvent . ACTION_CANCEL : mIsBeingDragged = false ; mDragHelper . processTouchEvent ( event ) ; break ; default : mDragHelper . processTouchEvent ( event ) ; } return super . onTouchEvent ( event ) || mIsBeingDragged || action == MotionEvent . ACTION_DOWN ; } public boolean isClickToClose ( ) { return mClickToClose ; } public void setClickToClose ( boolean mClickToClose ) { this . mClickToClose = mClickToClose ; } public void setSwipeEnabled ( boolean enabled ) { mSwipeEnabled = enabled ; } public boolean isSwipeEnabled ( ) { return mSwipeEnabled ; } public boolean isLeftSwipeEnabled ( ) { View bottomView = mDragEdges . get ( DragEdge . Left ) ; return bottomView != null && bottomView . getParent ( ) == this && bottomView != getSurfaceView ( ) && mSwipesEnabled [ DragEdge . Left . ordinal ( ) ] ; } public void setLeftSwipeEnabled ( boolean leftSwipeEnabled ) { this . mSwipesEnabled [ DragEdge . Left . ordinal ( ) ] = leftSwipeEnabled ; } public boolean isRightSwipeEnabled ( ) { View bottomView = mDragEdges . get ( DragEdge . Right ) ; return bottomView != null && bottomView . getParent ( ) == this && bottomView != getSurfaceView ( ) && mSwipesEnabled [ DragEdge . Right . ordinal ( ) ] ; } public void setRightSwipeEnabled ( boolean rightSwipeEnabled ) { this . mSwipesEnabled [ DragEdge . Right . ordinal ( ) ] = rightSwipeEnabled ; } public boolean isTopSwipeEnabled ( ) { View bottomView = mDragEdges . get ( DragEdge . Top ) ; return bottomView != null && bottomView . getParent ( ) == this && bottomView != getSurfaceView ( ) && mSwipesEnabled [ DragEdge . Top . ordinal ( ) ] ; } public void setTopSwipeEnabled ( boolean topSwipeEnabled ) { this . mSwipesEnabled [ DragEdge . Top . ordinal ( ) ] = topSwipeEnabled ; } public boolean isBottomSwipeEnabled ( ) { View bottomView = mDragEdges . get ( DragEdge . Bottom ) ; return bottomView != null && bottomView . getParent ( ) == this && bottomView != getSurfaceView ( ) && mSwipesEnabled [ DragEdge . Bottom . ordinal ( ) ] ; } public void setBottomSwipeEnabled ( boolean bottomSwipeEnabled ) { this . mSwipesEnabled [ DragEdge . Bottom . ordinal ( ) ] = bottomSwipeEnabled ; } public float getWillOpenPercentAfterOpen ( ) { return mWillOpenPercentAfterOpen ; } public void setWillOpenPercentAfterOpen ( float willOpenPercentAfterOpen ) { this . mWillOpenPercentAfterOpen = willOpenPercentAfterOpen ; } public float getWillOpenPercentAfterClose ( ) { return mWillOpenPercentAfterClose ; } public void setWillOpenPercentAfterClose ( float willOpenPercentAfterClose ) { this . mWillOpenPercentAfterClose = willOpenPercentAfterClose ; } private boolean insideAdapterView ( ) { return getAdapterView ( ) != null ; } private AdapterView getAdapterView ( ) { ViewParent t = getParent ( ) ; if ( t instanceof AdapterView ) { return ( AdapterView ) t ; } return null ; } private void performAdapterViewItemClick ( ) { if ( getOpenStatus ( ) != Status . Close ) return ; ViewParent t = getParent ( ) ; if ( t instanceof AdapterView ) { AdapterView view = ( AdapterView ) t ; int p = view . getPositionForView ( SwipeLayout . this ) ; if ( p != AdapterView . INVALID_POSITION ) { view . performItemClick ( view . getChildAt ( p - view . getFirstVisiblePosition ( ) ) , p , view . getAdapter ( ) . getItemId ( p ) ) ; } } } private boolean performAdapterViewItemLongClick ( ) { if ( getOpenStatus ( ) != Status . Close ) return false ; ViewParent t = getParent ( ) ; if ( t instanceof AdapterView ) { AdapterView view = ( AdapterView ) t ; int p = view . getPositionForView ( SwipeLayout . this ) ; if ( p == AdapterView . INVALID_POSITION ) return false ; long vId = view . getItemIdAtPosition ( p ) ; boolean handled = false ; try { Method m = AbsListView . class . getDeclaredMethod ( "performLongPress" , View . class , int . class , long . class ) ; m . setAccessible ( true ) ; handled = ( boolean ) m . invoke ( view , SwipeLayout . this , p , vId ) ; } catch ( Exception e ) { e . printStackTrace ( ) ; if ( view . getOnItemLongClickListener ( ) != null ) { handled = view . getOnItemLongClickListener ( ) . onItemLongClick ( view , SwipeLayout . this , p , vId ) ; } if ( handled ) { view . performHapticFeedback ( HapticFeedbackConstants . LONG_PRESS ) ; } } return handled ; } return false ; } @ Override protected void onAttachedToWindow ( ) { super . onAttachedToWindow ( ) ; if ( insideAdapterView ( ) ) { if ( clickListener == null ) { setOnClickListener ( new OnClickListener ( ) { @ Override public void onClick ( View v ) { performAdapterViewItemClick ( ) ; } } ) ; } if ( longClickListener == null ) { setOnLongClickListener ( new OnLongClickListener ( ) { @ Override public boolean onLongClick ( View v ) { performAdapterViewItemLongClick ( ) ; return true ; } } ) ; } } } OnClickListener clickListener ; @ Override public void setOnClickListener ( OnClickListener l ) { super . setOnClickListener ( l ) ; clickListener = l ; } OnLongClickListener longClickListener ; @ Override public void setOnLongClickListener ( OnLongClickListener l ) { super . setOnLongClickListener ( l ) ; longClickListener = l ; } private Rect hitSurfaceRect ; private boolean isTouchOnSurface ( MotionEvent ev ) { View surfaceView = getSurfaceView ( ) ; if ( surfaceView == null ) { return false ; } if ( hitSurfaceRect == null ) { hitSurfaceRect = new Rect ( ) ; } surfaceView . getHitRect ( hitSurfaceRect ) ; return hitSurfaceRect . contains ( ( int ) ev . getX ( ) , ( int ) ev . getY ( ) ) ; } private GestureDetector gestureDetector = new GestureDetector ( getContext ( ) , new SwipeDetector ( ) ) ; class SwipeDetector extends GestureDetector . SimpleOnGestureListener { @ Override public boolean onSingleTapUp ( MotionEvent e ) { if ( mClickToClose && isTouchOnSurface ( e ) ) { close ( ) ; } return super . onSingleTapUp ( e ) ; } @ Override public boolean onDoubleTap ( MotionEvent e ) { if ( mDoubleClickListener != null ) { View target ; View bottom = getCurrentBottomView ( ) ; View surface = getSurfaceView ( ) ; if ( bottom != null && e . getX ( ) > bottom . getLeft ( ) && e . getX ( ) < bottom . getRight ( ) && e . getY ( ) > bottom . getTop ( ) && e . getY ( ) < bottom . getBottom ( ) ) { target = bottom ; } else { target = surface ; } mDoubleClickListener . onDoubleClick ( SwipeLayout . this , target == surface ) ; } return true ; } } public void setDragDistance ( int max ) { if ( max < 0 ) max = 0 ; mDragDistance = dp2px ( max ) ; requestLayout ( ) ; } public void setShowMode ( ShowMode mode ) { mShowMode = mode ; requestLayout ( ) ; } public DragEdge getDragEdge ( ) { return mCurrentDragEdge ; } public int getDragDistance ( ) { return mDragDistance ; } public ShowMode getShowMode ( ) { return mShowMode ; } public View getSurfaceView ( ) { if ( getChildCount ( ) == 0 ) return null ; return getChildAt ( getChildCount ( ) - 1 ) ; } public View getCurrentBottomView ( ) { List < View > bottoms = getBottomViews ( ) ; if ( mCurrentDragEdge . ordinal ( ) < bottoms . size ( ) ) { return bottoms . get ( mCurrentDragEdge . ordinal ( ) ) ; } return null ; } public List < View > getBottomViews ( ) { ArrayList < View > bottoms = new ArrayList < View > ( ) ; for ( DragEdge dragEdge : DragEdge . values ( ) ) { bottoms . add ( mDragEdges . get ( dragEdge ) ) ; } return bottoms ; } public enum Status { Middle , Open , Close } public Status getOpenStatus ( ) { View surfaceView = getSurfaceView ( ) ; if ( surfaceView == null ) { return Status . Close ; } int surfaceLeft = surfaceView . getLeft ( ) ; int surfaceTop = surfaceView . getTop ( ) ; if ( surfaceLeft == getPaddingLeft ( ) && surfaceTop == getPaddingTop ( ) ) return Status . Close ; if ( surfaceLeft == ( getPaddingLeft ( ) - mDragDistance ) || surfaceLeft == ( getPaddingLeft ( ) + mDragDistance ) || surfaceTop == ( getPaddingTop ( ) - mDragDistance ) || surfaceTop == ( getPaddingTop ( ) + mDragDistance ) ) return Status . Open ; return Status . Middle ; } protected void processHandRelease ( float xvel , float yvel , boolean isCloseBeforeDragged ) { float minVelocity = mDragHelper . getMinVelocity ( ) ; View surfaceView = getSurfaceView ( ) ; DragEdge currentDragEdge = mCurrentDragEdge ; if ( currentDragEdge == null || surfaceView == null ) { return ; } float willOpenPercent = ( isCloseBeforeDragged ? mWillOpenPercentAfterClose : mWillOpenPercentAfterOpen ) ; if ( currentDragEdge == DragEdge . Left ) { if ( xvel > minVelocity ) open ( ) ; else if ( xvel < - minVelocity ) close ( ) ; else { float openPercent = 1f * getSurfaceView ( ) . getLeft ( ) / mDragDistance ; if ( openPercent > willOpenPercent ) open ( ) ; else close ( ) ; } } else if ( currentDragEdge == DragEdge . Right ) { if ( xvel > minVelocity ) close ( ) ; else if ( xvel < - minVelocity ) open ( ) ; else { float openPercent = 1f * ( - getSurfaceView ( ) . getLeft ( ) ) / mDragDistance ; if ( openPercent > willOpenPercent ) open ( ) ; else close ( ) ; } } else if ( currentDragEdge == DragEdge . Top ) { if ( yvel > minVelocity ) open ( ) ; else if ( yvel < - minVelocity ) close ( ) ; else { float openPercent = 1f * getSurfaceView ( ) . getTop ( ) / mDragDistance ; if ( openPercent > willOpenPercent ) open ( ) ; else close ( ) ; } } else if ( currentDragEdge == DragEdge . Bottom ) { if ( yvel > minVelocity ) close ( ) ; else if ( yvel < - minVelocity ) open ( ) ; else { float openPercent = 1f * ( - getSurfaceView ( ) . getTop ( ) ) / mDragDistance ; if ( openPercent > willOpenPercent ) open ( ) ; else close ( ) ; } } } public void open ( ) { open ( true , true ) ; } public void open ( boolean smooth ) { open ( smooth , true ) ; } public void open ( boolean smooth , boolean notify ) { View surface = getSurfaceView ( ) , bottom = getCurrentBottomView ( ) ; if ( surface == null ) { return ; } int dx , dy ; Rect rect = computeSurfaceLayoutArea ( true ) ; if ( smooth ) { mDragHelper . smoothSlideViewTo ( surface , rect . left , rect . top ) ; } else { dx = rect . left - surface . getLeft ( ) ; dy = rect . top - surface . getTop ( ) ; surface . layout ( rect . left , rect . top , rect . right , rect . bottom ) ; if ( getShowMode ( ) == ShowMode . PullOut ) { Rect bRect = computeBottomLayoutAreaViaSurface ( ShowMode . PullOut , rect ) ; if ( bottom != null ) { bottom . layout ( bRect . left , bRect . top , bRect . right , bRect . bottom ) ; } } if ( notify ) { dispatchRevealEvent ( rect . left , rect . top , rect . right , rect . bottom ) ; dispatchSwipeEvent ( rect . left , rect . top , dx , dy ) ; } else { safeBottomView ( ) ; } } invalidate ( ) ; } public void open ( DragEdge edge ) { setCurrentDragEdge ( edge ) ; open ( true , true ) ; } public void open ( boolean smooth , DragEdge edge ) { setCurrentDragEdge ( edge ) ; open ( smooth , true ) ; } public void open ( boolean smooth , boolean notify , DragEdge edge ) { setCurrentDragEdge ( edge ) ; open ( smooth , notify ) ; } public void close ( ) { close ( true , true ) ; } public void close ( boolean smooth ) { close ( smooth , true ) ; } public void close ( boolean smooth , boolean notify ) { View surface = getSurfaceView ( ) ; if ( surface == null ) { return ; } int dx , dy ; if ( smooth ) mDragHelper . smoothSlideViewTo ( getSurfaceView ( ) , getPaddingLeft ( ) , getPaddingTop ( ) ) ; else { Rect rect = computeSurfaceLayoutArea ( false ) ; dx = rect . left - surface . getLeft ( ) ; dy = rect . top - surface . getTop ( ) ; surface . layout ( rect . left , rect . top , rect . right , rect . bottom ) ; if ( notify ) { dispatchRevealEvent ( rect . left , rect . top , rect . right , rect . bottom ) ; dispatchSwipeEvent ( rect . left , rect . top , dx , dy ) ; } else { safeBottomView ( ) ; } } invalidate ( ) ; } public void toggle ( ) { toggle ( true ) ; } public void toggle ( boolean smooth ) { if ( getOpenStatus ( ) == Status . Open ) close ( smooth ) ; else if ( getOpenStatus ( ) == Status . Close ) open ( smooth ) ; } private Rect computeSurfaceLayoutArea ( boolean open ) { int l = getPaddingLeft ( ) , t = getPaddingTop ( ) ; if ( open ) { if ( mCurrentDragEdge == DragEdge . Left ) l = getPaddingLeft ( ) + mDragDistance ; else if ( mCurrentDragEdge == DragEdge . Right ) l = getPaddingLeft ( ) - mDragDistance ; else if ( mCurrentDragEdge == DragEdge . Top ) t = getPaddingTop ( ) + mDragDistance ; else t = getPaddingTop ( ) - mDragDistance ; } return new Rect ( l , t , l + getMeasuredWidth ( ) , t + getMeasuredHeight ( ) ) ; } private Rect computeBottomLayoutAreaViaSurface ( ShowMode mode , Rect surfaceArea ) { Rect rect = surfaceArea ; View bottomView = getCurrentBottomView ( ) ; int bl = rect . left , bt = rect . top , br = rect . right , bb = rect . bottom ; if ( mode == ShowMode . PullOut ) { if ( mCurrentDragEdge == DragEdge . Left ) bl = rect . left - mDragDistance ; else if ( mCurrentDragEdge == DragEdge . Right ) bl = rect . right ; else if ( mCurrentDragEdge == DragEdge . Top ) bt = rect . top - mDragDistance ; else bt = rect . bottom ; if ( mCurrentDragEdge == DragEdge . Left || mCurrentDragEdge == DragEdge . Right ) { bb = rect . bottom ; br = bl + ( bottomView == null ? 0 : bottomView . getMeasuredWidth ( ) ) ; } else { bb = bt + ( bottomView == null ? 0 : bottomView . getMeasuredHeight ( ) ) ; br = rect . right ; } } else if ( mode == ShowMode . LayDown ) { if ( mCurrentDragEdge == DragEdge . Left ) br = bl + mDragDistance ; else if ( mCurrentDragEdge == DragEdge . Right ) bl = br - mDragDistance ; else if ( mCurrentDragEdge == DragEdge . Top ) bb = bt + mDragDistance ; else bt = bb - mDragDistance ; } return new Rect ( bl , bt , br , bb ) ; } private Rect computeBottomLayDown ( DragEdge dragEdge ) { int bl = getPaddingLeft ( ) , bt = getPaddingTop ( ) ; int br , bb ; if ( dragEdge == DragEdge . Right ) { bl = getMeasuredWidth ( ) - mDragDistance ; } else if ( dragEdge == DragEdge . Bottom ) { bt = getMeasuredHeight ( ) - mDragDistance ; } if ( dragEdge == DragEdge . Left || dragEdge == DragEdge . Right ) { br = bl + mDragDistance ; bb = bt + getMeasuredHeight ( ) ; } else { br = bl + getMeasuredWidth ( ) ; bb = bt + mDragDistance ; } return new Rect ( bl , bt , br , bb ) ; } public void setOnDoubleClickListener ( DoubleClickListener doubleClickListener ) { mDoubleClickListener = doubleClickListener ; } public interface DoubleClickListener { void onDoubleClick ( SwipeLayout layout , boolean surface ) ; } private int dp2px ( float dp ) { return ( int ) ( dp * getContext ( ) . getResources ( ) . getDisplayMetrics ( ) . density + 0.5f ) ; } @ Deprecated public void setDragEdge ( DragEdge dragEdge ) { clearDragEdge ( ) ; if ( getChildCount ( ) >= 2 ) { mDragEdges . put ( dragEdge , getChildAt ( getChildCount ( ) - 2 ) ) ; } setCurrentDragEdge ( dragEdge ) ; } public void onViewRemoved ( View child ) { for ( Map . Entry < DragEdge , View > entry : new HashMap < DragEdge , View > ( mDragEdges ) . entrySet ( ) ) { if ( entry . getValue ( ) == child ) { mDragEdges . remove ( entry . getKey ( ) ) ; } } } public Map < DragEdge , View > getDragEdgeMap ( ) { return mDragEdges ; } @ Deprecated public List < DragEdge > getDragEdges ( ) { return new ArrayList < DragEdge > ( mDragEdges . keySet ( ) ) ; } @ Deprecated public void setDragEdges ( List < DragEdge > dragEdges ) { clearDragEdge ( ) ; for ( int i = 0 , size = Math . min ( dragEdges . size ( ) , getChildCount ( ) - 1 ) ; i < size ; i ++ ) { DragEdge dragEdge = dragEdges . get ( i ) ; mDragEdges . put ( dragEdge , getChildAt ( i ) ) ; } if ( dragEdges . size ( ) == 0 || dragEdges . contains ( DefaultDragEdge ) ) { setCurrentDragEdge ( DefaultDragEdge ) ; } else { setCurrentDragEdge ( dragEdges . get ( 0 ) ) ; } } @ Deprecated public void setDragEdges ( DragEdge ... mDragEdges ) { clearDragEdge ( ) ; setDragEdges ( Arrays . asList ( mDragEdges ) ) ; } @ Deprecated public void setBottomViewIds ( int leftId , int rightId , int topId , int bottomId ) { addDrag ( DragEdge . Left , findViewById ( leftId ) ) ; addDrag ( DragEdge . Right , findViewById ( rightId ) ) ; addDrag ( DragEdge . Top , findViewById ( topId ) ) ; addDrag ( DragEdge . Bottom , findViewById ( bottomId ) ) ; } private float getCurrentOffset ( ) { if ( mCurrentDragEdge == null ) return 0 ; return mEdgeSwipesOffset [ mCurrentDragEdge . ordinal ( ) ] ; } private void setCurrentDragEdge ( DragEdge dragEdge ) { mCurrentDragEdge = dragEdge ; updateBottomViews ( ) ; } private void updateBottomViews ( ) { View currentBottomView = getCurrentBottomView ( ) ; if ( currentBottomView != null ) { if ( mCurrentDragEdge == DragEdge . Left || mCurrentDragEdge == DragEdge . Right ) { mDragDistance = currentBottomView . getMeasuredWidth ( ) - dp2px ( getCurrentOffset ( ) ) ; } else { mDragDistance = currentBottomView . getMeasuredHeight ( ) - dp2px ( getCurrentOffset ( ) ) ; } } if ( mShowMode == ShowMode . PullOut ) { layoutPullOut ( ) ; } else if ( mShowMode == ShowMode . LayDown ) { layoutLayDown ( ) ; } safeBottomView ( ) ; } }
bind multiple views with an
{@link com.daimajia.swipe.SwipeLayout.OnRevealListener}.

@param childIds the view id.
@param l        the {@link com.daimajia.swipe.SwipeLayout.OnRevealListener}