import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
/**
 * Performs the undo animation and restores the original state for given {@link android.view.View}.
 *
 * @param view the parent {@code View} which contains both primary and undo {@code View}s.
 */
public void undo(@NonNull final View view) {
    int position = AdapterViewUtil.getPositionForView(getListViewWrapper(), view);
    mUndoPositions.remove(position);

    View primaryView = mCallback.getPrimaryView(view);
    View undoView = mCallback.getUndoView(view);

    primaryView.setVisibility(View.VISIBLE);

    ObjectAnimator undoAlphaAnimator = ObjectAnimator.ofFloat(undoView, ALPHA, 1f, 0f);
    ObjectAnimator primaryAlphaAnimator = ObjectAnimator.ofFloat(primaryView, ALPHA, 0f, 1f);
    ObjectAnimator primaryXAnimator = ObjectAnimator.ofFloat(primaryView, TRANSLATION_X, primaryView.getWidth(), 0f);

    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.playTogether(undoAlphaAnimator, primaryAlphaAnimator, primaryXAnimator);
    animatorSet.addListener(new UndoAnimatorListener(undoView));
    animatorSet.start();

    mCallback.onUndo(view, position);
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
/**
 * Flings the {@link android.view.View} corresponding to given position out of sight.
 * Calling this method has the same effect as manually swiping an item off the screen.
 *
 * @param position the position of the item in the {@link android.widget.ListAdapter}. Must be visible.
 */
public void fling(final int position) {
    int firstVisiblePosition = mListViewWrapper.getFirstVisiblePosition();
    int lastVisiblePosition = mListViewWrapper.getLastVisiblePosition();
    if (position < firstVisiblePosition || position > lastVisiblePosition) {
        throw new IllegalArgumentException("View for position " + position + " not visible!");
    }

    View downView = AdapterViewUtil.getViewForPosition(mListViewWrapper, position);
    if (downView == null) {
        throw new IllegalStateException("No view found for position " + position);
    }
    flingView(downView, position, true);

    mActiveSwipeCount++;
    mVirtualListCount--;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private void dismissAbove(final int position) {
    View view = AdapterViewUtil.getViewForPosition(getListViewWrapper(), getListViewWrapper().getFirstVisiblePosition());

    if (view != null) {
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        int scrollDistance = view.getMeasuredHeight();

        getListViewWrapper().smoothScrollBy(scrollDistance, (int) mDismissAnimationTime);
        mHandler.postDelayed(new RestoreScrollRunnable(scrollDistance, position), mDismissAnimationTime);
    }
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private boolean handleDownEvent(@Nullable final View view, @NonNull final MotionEvent motionEvent) {
    if (!mSwipeEnabled) {
        return false;
    }

    View downView = findDownView(motionEvent);
    if (downView == null) {
        return false;
    }

    int downPosition = AdapterViewUtil.getPositionForView(mListViewWrapper, downView);
    mCanDismissCurrent = isDismissable(downPosition);

    /* Check if we are processing the item at this position */
    if (mCurrentPosition == downPosition || downPosition >= mVirtualListCount) {
        return false;
    }

    if (view != null) {
        view.onTouchEvent(motionEvent);
    }

    disableHorizontalScrollContainerIfNecessary(motionEvent, downView);

    mDownX = motionEvent.getX();
    mDownY = motionEvent.getY();

    mCurrentView = downView;
    mSwipingView = getSwipeView(downView);
    mCurrentPosition = downPosition;

    mVelocityTracker = VelocityTracker.obtain();
    mVelocityTracker.addMovement(motionEvent);
    return true;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
@Nullable
private View findViewForPosition(final int position) {
    if (mListViewWrapper == null) {
        throw new IllegalStateException("Call setAbsListView on this ExpanableListItemAdapter!");
    }

    View result = null;
    for (int i = 0; i < mListViewWrapper.getChildCount() && result == null; i++) {
        View childView = mListViewWrapper.getChildAt(i);
        if (childView != null && AdapterViewUtil.getPositionForView(mListViewWrapper, childView) == position) {
            result = childView;
        }
    }
    return result;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private ContextualUndoView getCurrentRemovedView(final ContextualUndoView currentRemovedView, final long itemId) {
    ContextualUndoView result = currentRemovedView;
    if (result == null ||
            result.getParent() == null ||
            result.getItemId() != itemId ||
            AdapterViewUtil.getPositionForView(getAbsListView(), result) < 0) {
        result = getContextualUndoView(itemId);
    }
    return result;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
/**
 * Animate the item at given position away and show the undo {@link View}.
 * @param position the position.
 */
public void swipeViewAtPosition(final int position) {
    mCurrentRemovedId = getItemId(position);
    for (int i = 0; i < getAbsListView().getChildCount(); i++) {
        AbsListView absListView = getAbsListView();
        View childView = absListView.getChildAt(i);
        int positionForView = AdapterViewUtil.getPositionForView(absListView, childView);
        if (positionForView == position) {
            swipeView(childView, positionForView);
        }
    }
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private List<View> getVisibleViewsForPositions(final Collection<Integer> positions) {
    List<View> views = new ArrayList<View>();
    for (int i = 0; i < getAbsListView().getChildCount(); i++) {
        View child = getAbsListView().getChildAt(i);
        if (positions.contains(AdapterViewUtil.getPositionForView(getAbsListView(), child))) {
            views.add(child);
        }
    }
    return views;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private View findViewForPosition(final int position) {
    View result = null;
    for (int i = 0; i < mAbsListView.getChildCount() && result == null; i++) {
        View childView = mAbsListView.getChildAt(i);
        if (AdapterViewUtil.getPositionForView(mAbsListView, childView) == position) {
            result = childView;
        }
    }
    return result;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private boolean handleDownEvent(final View view, final MotionEvent motionEvent) {
    mDisallowSwipe = false;
    if (mPaused) {
        return false;
    }

    // Find the child view that was touched (perform a hit test)
    Rect rect = new Rect();
    int childCount = mListView.getChildCount();
    int[] listViewCoords = new int[2];
    mListView.getLocationOnScreen(listViewCoords);
    int x = (int) motionEvent.getRawX() - listViewCoords[0];
    int y = (int) motionEvent.getRawY() - listViewCoords[1];
    View child;
    for (int i = 0; i < childCount; i++) {
        child = mListView.getChildAt(i);
        child.getHitRect(rect);
        if (rect.contains(x, y)) {
            mDownView = child;
            break;
        }
    }

    if (mDownView != null && mDownView instanceof ContextualUndoView) {
        mDownX = motionEvent.getRawX();
        mDownY = motionEvent.getRawY();
        int downPosition = AdapterViewUtil.getPositionForView(mListView, mDownView);

        if (mDismissableManager != null) {
            long downId = mListView.getAdapter().getItemId(downPosition);
            if (!mDismissableManager.isDismissable(downId, downPosition)) {
                /* Cancel, not dismissable */
                return false;
            }
        }

        mTouchChildTouched = !mIsParentHorizontalScrollContainer && mResIdOfTouchChild == 0;

        if (mResIdOfTouchChild != 0) {
            mIsParentHorizontalScrollContainer = false;

            final View childView = mDownView.findViewById(mResIdOfTouchChild);
            if (childView != null) {
                final Rect childRect = getChildViewRect(mListView, childView);
                if (childRect.contains((int) motionEvent.getX(), (int) motionEvent.getY())) {
                    mTouchChildTouched = true;
                    mListView.requestDisallowInterceptTouchEvent(true);
                }
            }
        }

        if (mIsParentHorizontalScrollContainer) {
            // Do it now and don't wait until the user moves more than
            // the slop factor.
            mTouchChildTouched = true;
            mListView.requestDisallowInterceptTouchEvent(true);
        }

        mDownY = motionEvent.getRawY();
        mDownPosition = AdapterViewUtil.getPositionForView(mListView, mDownView);

        if (mTouchChildTouched) {
            mVelocityTracker = VelocityTracker.obtain();
            mVelocityTracker.addMovement(motionEvent);
        } else {
            mVelocityTracker = null;
        }
    }
    view.onTouchEvent(motionEvent);
    return true;
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private void deleteCurrentItem(final View view) {
    int position = AdapterViewUtil.getPositionForView(getAbsListView(), view);
    mDeleteItemCallback.deleteItem(position);
}
 

import com.nhaarman.listviewanimations.util.AdapterViewUtil; //导入依赖的package包/类
private boolean handleDownEvent(final MotionEvent motionEvent) {
    // Find the child view that was touched (perform a hit test)
    Rect rect = new Rect();
    int childCount = mListView.getChildCount();
    int[] listViewCoords = new int[2];
    mListView.getLocationOnScreen(listViewCoords);
    int x = (int) motionEvent.getRawX() - listViewCoords[0];
    int y = (int) motionEvent.getRawY() - listViewCoords[1];
    View downView = null;
    for (int i = 0; i < childCount && downView == null; i++) {
        View child = mListView.getChildAt(i);
        child.getHitRect(rect);
        if (rect.contains(x, y)) {
            downView = child;
        }
    }

    if (downView != null) {
        mDownX = motionEvent.getRawX();
        mDownY = motionEvent.getRawY();
        int downPosition = AdapterViewUtil.getPositionForView(mListView, downView);

        if (mDismissableManager != null) {
            long downId = mListView.getAdapter().getItemId(downPosition);
            if (!mDismissableManager.isDismissable(downId, downPosition)) {
                /* Cancel, not dismissable */
                return false;
            }
        }

        mCurrentDismissData = createPendingDismissData(downPosition, downView);

        if (mPendingDismisses.contains(mCurrentDismissData) || downPosition >= mVirtualListCount) {
            // Cancel, we're already processing this position
            mCurrentDismissData = null;
            return false;
        } else {
            mTouchChildTouched = !mIsParentHorizontalScrollContainer && mResIdOfTouchChild == 0;

            if (mResIdOfTouchChild != 0) {
                mIsParentHorizontalScrollContainer = false;

                final View childView = downView.findViewById(mResIdOfTouchChild);
                if (childView != null) {
                    final Rect childRect = getChildViewRect(mListView, childView);
                    if (childRect.contains((int) motionEvent.getX(), (int) motionEvent.getY())) {
                        mTouchChildTouched = true;
                        mListView.requestDisallowInterceptTouchEvent(true);
                    }
                }
            }

            if (mIsParentHorizontalScrollContainer) {
                // Do it now and don't wait until the user moves more than
                // the slop factor.
                mTouchChildTouched = true;
                mListView.requestDisallowInterceptTouchEvent(true);
            }

            mVelocityTracker = VelocityTracker.obtain();
            mVelocityTracker.addMovement(motionEvent);
        }
    }
    return true;
}