content: package com.unnamed.b.atv.view;
  
  import android.annotation.SuppressLint;
  import android.content.Context;
  import android.graphics.Rect;
  import android.util.AttributeSet;
  import android.view.FocusFinder;
  import android.view.KeyEvent;
  import android.view.MotionEvent;
  import android.view.VelocityTracker;
  import android.view.View;
  import android.view.ViewConfiguration;
  import android.view.ViewGroup;
  import android.view.ViewParent;
  import android.view.animation.AnimationUtils;
  import android.widget.FrameLayout;
  import android.widget.LinearLayout;
  import android.widget.Scroller;
  import android.widget.TextView;
  
  import java.util.List;
  
  /**
   * Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger
   * than the physical display. A TwoDScrollView is a {@link FrameLayout}, meaning you should place
   * one child in it containing the entire contents to scroll; this child may itself be a layout
   * manager with a complex hierarchy of objects. A child that is often used is a {@link LinearLayout}
   * in a vertical orientation, presenting a vertical array of top-level items that the user can
   * scroll through.
   *
   * <p>
   *
   * <p>The {@link TextView} class also takes care of its own scrolling, so does not require a
   * TwoDScrollView, but using the two together is possible to achieve the effect of a text view
   * within a larger container.
   */
  public class TwoDScrollView extends FrameLayout {
    static final int ANIMATED_SCROLL_GAP = 250;
    static final float MAX_SCROLL_FACTOR = 0.5f;
    private final Rect mTempRect = new Rect();
    private long mLastScroll;
    private Scroller mScroller;
  
    /**
     * Flag to indicate that we are moving focus ourselves. This is so the code that watches for focus
     * changes initiated outside this TwoDScrollView knows that it does not have to do anything.
     */
    private boolean mTwoDScrollViewMovedFocus;
  
    /** Position of the last motion event. */
    private float mLastMotionY;
  
    private float mLastMotionX;
  
    /**
     * True when the layout has changed but the traversal has not come through yet. Ideally the view
     * hierarchy would keep track of this for us.
     */
    private boolean mIsLayoutDirty = true;
  
    /**
     * The child to give focus to in the event that a child has requested focus while the layout is
     * dirty. This prevents the scroll from being wrong if the child has not been laid out before
     * requesting focus.
     */
    private View mChildToScrollTo = null;
  
    /**
     * True if the user is currently dragging this TwoDScrollView around. This is not the same as 'is
     * being flinged', which can be checked by mScroller.isFinished() (flinging begins when the user
     * lifts his finger).
     */
    private boolean mIsBeingDragged = false;
  
    /** Determines speed during touch scrolling */
    private VelocityTracker mVelocityTracker;
  
    /** Whether arrow scrolling is animated. */
    private int mTouchSlop;
  
    private int mMinimumVelocity;
    private int mMaximumVelocity;
  
    public TwoDScrollView(Context context) {
      super(context);
      initTwoDScrollView();
    }
  
    private void initTwoDScrollView() {
      mScroller = new Scroller(getContext());
      setFocusable(true);
      setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
      setWillNotDraw(false);
      final ViewConfiguration configuration = ViewConfiguration.get(getContext());
      mTouchSlop = configuration.getScaledTouchSlop();
      mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
      mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
    }
  
    public TwoDScrollView(Context context, AttributeSet attrs) {
      super(context, attrs);
      initTwoDScrollView();
    }
  
    public TwoDScrollView(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
      initTwoDScrollView();
    }
  
    /**
     * @return The maximum amount this scroll view will scroll in response to an arrow event.
     */
    public int getMaxScrollAmountVertical() {
      return (int) (MAX_SCROLL_FACTOR * getHeight());
    }
  
    public int getMaxScrollAmountHorizontal() {
      return (int) (MAX_SCROLL_FACTOR * getWidth());
    }
  
    /**
     * You can call this function yourself to have the scroll view perform scrolling from a key event,
     * just as if the event had been dispatched to it by the view hierarchy.
     *
     * @param event The key event to execute.
     * @return Return true if the event was handled, else false.
     */
    public boolean executeKeyEvent(KeyEvent event) {
      mTempRect.setEmpty();
      if (!canScroll()) {
        if (isFocused()) {
          View currentFocused = findFocus();
          if (currentFocused == this) currentFocused = null;
          View nextFocused =
              FocusFinder.getInstance().findNextFocus(this, currentFocused, View.FOCUS_DOWN);
          return nextFocused != null
              && nextFocused != this
              && nextFocused.requestFocus(View.FOCUS_DOWN);
        }
        return false;
      }
      boolean handled = false;
      if (event.getAction() == KeyEvent.ACTION_DOWN) {
        switch (event.getKeyCode()) {
          case KeyEvent.KEYCODE_DPAD_UP:
            if (!event.isAltPressed()) {
              handled = arrowScroll(View.FOCUS_UP, false);
            } else {
              handled = fullScroll(View.FOCUS_UP, false);
            }
            break;
          case KeyEvent.KEYCODE_DPAD_DOWN:
            if (!event.isAltPressed()) {
              handled = arrowScroll(View.FOCUS_DOWN, false);
            } else {
              handled = fullScroll(View.FOCUS_DOWN, false);
            }
            break;
          case KeyEvent.KEYCODE_DPAD_LEFT:
            if (!event.isAltPressed()) {
              handled = arrowScroll(View.FOCUS_LEFT, true);
            } else {
              handled = fullScroll(View.FOCUS_LEFT, true);
            }
            break;
          case KeyEvent.KEYCODE_DPAD_RIGHT:
            if (!event.isAltPressed()) {
              handled = arrowScroll(View.FOCUS_RIGHT, true);
            } else {
              handled = fullScroll(View.FOCUS_RIGHT, true);
            }
            break;
        }
      }
      return handled;
    }
  
    @SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
  
      if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
        // Don't handle edge touches immediately -- they may actually belong to one of our
        // descendants.
        return false;
      }
  
      if (!canScroll()) {
        return false;
      }
  
      if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
      }
      mVelocityTracker.addMovement(ev);
  
      final int action = ev.getAction();
      final float y = ev.getY();
      final float x = ev.getX();
  
      switch (action) {
        case MotionEvent.ACTION_DOWN:
          /*
           * If being flinged and user touches, stop the fling. isFinished
           * will be false if being flinged.
           */
          if (!mScroller.isFinished()) {
            mScroller.abortAnimation();
          }
  
          // Remember where the motion event started
          mLastMotionY = y;
          mLastMotionX = x;
          break;
        case MotionEvent.ACTION_MOVE:
          // Scroll to follow the motion event
          int deltaX = (int) (mLastMotionX - x);
          int deltaY = (int) (mLastMotionY - y);
          mLastMotionX = x;
          mLastMotionY = y;
  
          if (deltaX < 0) {
            if (getScrollX() < 0) {
              deltaX = 0;
            }
          } else if (deltaX > 0) {
            final int rightEdge = getWidth() - getPaddingRight();
            final int availableToScroll = getChildAt(0).getRight() - getScrollX() - rightEdge;
            if (availableToScroll > 0) {
              deltaX = Math.min(availableToScroll, deltaX);
            } else {
              deltaX = 0;
            }
          }
          if (deltaY < 0) {
            if (getScrollY() < 0) {
              deltaY = 0;
            }
          } else if (deltaY > 0) {
            final int bottomEdge = getHeight() - getPaddingBottom();
            final int availableToScroll = getChildAt(0).getBottom() - getScrollY() - bottomEdge;
            if (availableToScroll > 0) {
              deltaY = Math.min(availableToScroll, deltaY);
            } else {
              deltaY = 0;
            }
          }
          if (deltaY != 0 || deltaX != 0) scrollBy(deltaX, deltaY);
          break;
        case MotionEvent.ACTION_UP:
          final VelocityTracker velocityTracker = mVelocityTracker;
          velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
          int initialXVelocity = (int) velocityTracker.getXVelocity();
          int initialYVelocity = (int) velocityTracker.getYVelocity();
          if ((Math.abs(initialXVelocity) + Math.abs(initialYVelocity) > mMinimumVelocity)
              && getChildCount() > 0) {
            fling(-initialXVelocity, -initialYVelocity);
          }
          if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
          }
      }
      return true;
    }
  
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
      super.onSizeChanged(w, h, oldw, oldh);
  
      View currentFocused = findFocus();
      if (null == currentFocused || this == currentFocused) return;
  
      // If the currently-focused view was visible on the screen when the
      // screen was at the old height, then scroll the screen to make that
      // view visible with the new screen height.
      currentFocused.getDrawingRect(mTempRect);
      offsetDescendantRectToMyCoords(currentFocused, mTempRect);
      int scrollDeltaX = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
      int scrollDeltaY = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
      doScroll(scrollDeltaX, scrollDeltaY);
    }
  
    /**
     * Smooth scroll by a Y delta
     *
     * @param delta the number of pixels to scroll by on the Y axis
     */
    private void doScroll(int deltaX, int deltaY) {
      if (deltaX != 0 || deltaY != 0) {
        smoothScrollBy(deltaX, deltaY);
      }
    }
  
    /**
     * {@inheritDoc}
     *
     * <p>
     *
     * <p>This version also clamps the scrolling to the bounds of our child.
     */
    public void scrollTo(int x, int y) {
      // we rely on the fact the View.scrollBy calls scrollTo.
      if (getChildCount() > 0) {
        View child = getChildAt(0);
        x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth());
        y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight());
        if (x != getScrollX() || y != getScrollY()) {
          super.scrollTo(x, y);
        }
      }
    }
  
    @Override
    public void computeScroll() {
      if (mScroller.computeScrollOffset()) {
        // This is called at drawing time by ViewGroup.  We don't want to
        // re-show the scrollbars at this point, which scrollTo will do,
        // so we replicate most of scrollTo here.
        //
        //         It's a little odd to call onScrollChanged from inside the drawing.
        //
        //         It is, except when you remember that computeScroll() is used to
        //         animate scrolling. So unless we want to defer the onScrollChanged()
        //         until the end of the animated scrolling, we don't really have a
        //         choice here.
        //
        //         I agree.  The alternative, which I think would be worse, is to post
        //         something and tell the subclasses later.  This is bad because there
        //         will be a window where mScrollX/Y is different from what the app
        //         thinks it is.
        //
        int oldX = getScrollX();
        int oldY = getScrollY();
        int x = mScroller.getCurrX();
        int y = mScroller.getCurrY();
        if (getChildCount() > 0) {
          View child = getChildAt(0);
          scrollTo(
              clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()),
              clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()));
        } else {
          scrollTo(x, y);
        }
        if (oldX != getScrollX() || oldY != getScrollY()) {
          onScrollChanged(getScrollX(), getScrollY(), oldX, oldY);
        }
  
        // Keep on drawing until the animation has finished.
        postInvalidate();
      }
    }
  
    @Override
    protected float getTopFadingEdgeStrength() {
      if (getChildCount() == 0) {
        return 0.0f;
      }
      final int length = getVerticalFadingEdgeLength();
      if (getScrollY() < length) {
        return getScrollY() / (float) length;
      }
      return 1.0f;
    }
  
    @Override
    protected float getBottomFadingEdgeStrength() {
      if (getChildCount() == 0) {
        return 0.0f;
      }
      final int length = getVerticalFadingEdgeLength();
      final int bottomEdge = getHeight() - getPaddingBottom();
      final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge;
      if (span < length) {
        return span / (float) length;
      }
      return 1.0f;
    }
  
    @Override
    protected float getLeftFadingEdgeStrength() {
      if (getChildCount() == 0) {
        return 0.0f;
      }
      final int length = getHorizontalFadingEdgeLength();
      if (getScrollX() < length) {
        return getScrollX() / (float) length;
      }
      return 1.0f;
    }
  
    @Override
    protected float getRightFadingEdgeStrength() {
      if (getChildCount() == 0) {
        return 0.0f;
      }
      final int length = getHorizontalFadingEdgeLength();
      final int rightEdge = getWidth() - getPaddingRight();
      final int span = getChildAt(0).getRight() - getScrollX() - rightEdge;
      if (span < length) {
        return span / (float) length;
      }
      return 1.0f;
    }
  
    @Override
    protected int computeHorizontalScrollRange() {
      int count = getChildCount();
      return count == 0 ? getWidth() : (getChildAt(0)).getRight();
    }
  
    /** The scroll range of a scroll view is the overall height of all of its children. */
    @Override
    protected int computeVerticalScrollRange() {
      int count = getChildCount();
      return count == 0 ? getHeight() : (getChildAt(0)).getBottom();
    }
  
    @Override
    public void requestLayout() {
      mIsLayoutDirty = true;
      super.requestLayout();
    }
  
    private int clamp(int n, int my, int child) {
      if (my >= child || n < 0) {
        /* my >= child is this case:
         *                    |--------------- me ---------------|
         *     |------ child ------|
         * or
         *     |--------------- me ---------------|
         *            |------ child ------|
         * or
         *     |--------------- me ---------------|
         *                                  |------ child ------|
         *
         * n < 0 is this case:
         *     |------ me ------|
         *                    |-------- child --------|
         *     |-- mScrollX --|
         */
        return 0;
      }
      if ((my + n) > child) {
        /* this case:
         *                    |------ me ------|
         *     |------ child ------|
         *     |-- mScrollX --|
         */
        return child - my;
      }
      return n;
    }
  
    /**
     * Fling the scroll view
     *
     * @param velocityY The initial velocity in the Y direction. Positive numbers mean that the
     *     finger/curor is moving down the screen, which means we want to scroll towards the top.
     */
    public void fling(int velocityX, int velocityY) {
      if (getChildCount() > 0) {
        int height = getHeight() - getPaddingBottom() - getPaddingTop();
        int bottom = getChildAt(0).getHeight();
        int width = getWidth() - getPaddingRight() - getPaddingLeft();
        int right = getChildAt(0).getWidth();
  
        mScroller.fling(
            getScrollX(), getScrollY(), velocityX, velocityY, 0, right - width, 0, bottom - height);
  
        final boolean movingDown = velocityY > 0;
        final boolean movingRight = velocityX > 0;
  
        View newFocused =
            findFocusableViewInMyBounds(
                movingRight, mScroller.getFinalX(), movingDown, mScroller.getFinalY(), findFocus());
        if (newFocused == null) {
          newFocused = this;
        }
  
        if (newFocused != findFocus()
            && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) {
          mTwoDScrollViewMovedFocus = true;
          mTwoDScrollViewMovedFocus = false;
        }
  
        awakenScrollBars(mScroller.getDuration());
        invalidate();
      }
    }
  
    /**
     * Finds the next focusable component that fits in this View's bounds (excluding fading edges)
     * pretending that this View's top is located at the parameter top.
     *
     * @param topFocus look for a candidate is the one at the top of the bounds if topFocus is true,
     *     or at the bottom of the bounds if topFocus is false
     * @param top the top offset of the bounds in which a focusable must be found (the fading edge is
     *     assumed to start at this position)
     * @param preferredFocusable the View that has highest priority and will be returned if it is
     *     within my bounds (null is valid)
     * @return the next focusable component in the bounds or null if none can be found
     */
    private View findFocusableViewInMyBounds(
        final boolean topFocus,
        final int top,
        final boolean leftFocus,
        final int left,
        View preferredFocusable) {
      /*
       * The fading edge's transparent side should be considered for focus
       * since it's mostly visible, so we divide the actual fading edge length
       * by 2.
       */
      final int verticalFadingEdgeLength = getVerticalFadingEdgeLength() / 2;
      final int topWithoutFadingEdge = top + verticalFadingEdgeLength;
      final int bottomWithoutFadingEdge = top + getHeight() - verticalFadingEdgeLength;
      final int horizontalFadingEdgeLength = getHorizontalFadingEdgeLength() / 2;
      final int leftWithoutFadingEdge = left + horizontalFadingEdgeLength;
      final int rightWithoutFadingEdge = left + getWidth() - horizontalFadingEdgeLength;
  
      if ((preferredFocusable != null)
          && (preferredFocusable.getTop() < bottomWithoutFadingEdge)
          && (preferredFocusable.getBottom() > topWithoutFadingEdge)
          && (preferredFocusable.getLeft() < rightWithoutFadingEdge)
          && (preferredFocusable.getRight() > leftWithoutFadingEdge)) {
        return preferredFocusable;
      }
      return findFocusableViewInBounds(
          topFocus,
          topWithoutFadingEdge,
          bottomWithoutFadingEdge,
          leftFocus,
          leftWithoutFadingEdge,
          rightWithoutFadingEdge);
    }
  
    /**
     * Finds the next focusable component that fits in the specified bounds.
     *
     * @param topFocus look for a candidate is the one at the top of the bounds if topFocus is true,
     *     or at the bottom of the bounds if topFocus is false
     * @param top the top offset of the bounds in which a focusable must be found
     * @param bottom the bottom offset of the bounds in which a focusable must be found
     * @return the next focusable component in the bounds or null if none can be found
     */
    private View findFocusableViewInBounds(
        boolean topFocus, int top, int bottom, boolean leftFocus, int left, int right) {
      List<View> focusables = getFocusables(View.FOCUS_FORWARD);
      View focusCandidate = null;
  
      /*
       * A fully contained focusable is one where its top is below the bound's
       * top, and its bottom is above the bound's bottom. A partially
       * contained focusable is one where some part of it is within the
       * bounds, but it also has some part that is not within bounds.  A fully contained
       * focusable is preferred to a partially contained focusable.
       */
      boolean foundFullyContainedFocusable = false;
  
      int count = focusables.size();
      for (int i = 0; i < count; i++) {
        View view = focusables.get(i);
        int viewTop = view.getTop();
        int viewBottom = view.getBottom();
        int viewLeft = view.getLeft();
        int viewRight = view.getRight();
  
        if (top < viewBottom && viewTop < bottom && left < viewRight && viewLeft < right) {
          /*
           * the focusable is in the target area, it is a candidate for
           * focusing
           */
          final boolean viewIsFullyContained =
              (top < viewTop) && (viewBottom < bottom) && (left < viewLeft) && (viewRight < right);
          if (focusCandidate == null) {
            /* No candidate, take this one */
            focusCandidate = view;
            foundFullyContainedFocusable = viewIsFullyContained;
          } else {
            final boolean viewIsCloserToVerticalBoundary =
                (topFocus && viewTop < focusCandidate.getTop())
                    || (!topFocus && viewBottom > focusCandidate.getBottom());
            final boolean viewIsCloserToHorizontalBoundary =
                (leftFocus && viewLeft < focusCandidate.getLeft())
                    || (!leftFocus && viewRight > focusCandidate.getRight());
            if (foundFullyContainedFocusable) {
              if (viewIsFullyContained
                  && viewIsCloserToVerticalBoundary
                  && viewIsCloserToHorizontalBoundary) {
                /*
                 * We're dealing with only fully contained views, so
                 * it has to be closer to the boundary to beat our
                 * candidate
                 */
                focusCandidate = view;
              }
            } else {
              if (viewIsFullyContained) {
                /* Any fully contained view beats a partially contained view */
                focusCandidate = view;
                foundFullyContainedFocusable = true;
              } else if (viewIsCloserToVerticalBoundary && viewIsCloserToHorizontalBoundary) {
                /*
                 * Partially contained view beats another partially
                 * contained view if it's closer
                 */
                focusCandidate = view;
              }
            }
          }
        }
      }
      return focusCandidate;
    }
  
    /**
     * Handles scrolling in response to a "home/end" shortcut press. This method will scroll the view
     * to the top or bottom and give the focus to the topmost/bottommost component in the new visible
     * area. If no component is a good candidate for focus, this scrollview reclaims the focus.
     *
     * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} to go the top of the
     *     view or {@link android.view.View#FOCUS_DOWN} to go the bottom
     * @return true if the key event is consumed by this method, false otherwise
     */
    public boolean fullScroll(int direction, boolean horizontal) {
      if (!horizontal) {
        boolean down = direction == View.FOCUS_DOWN;
        int height = getHeight();
        mTempRect.top = 0;
        mTempRect.bottom = height;
        if (down) {
          int count = getChildCount();
          if (count > 0) {
            View view = getChildAt(count - 1);
            mTempRect.bottom = view.getBottom();
            mTempRect.top = mTempRect.bottom - height;
          }
        }
        return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom, 0, 0, 0);
      } else {
        boolean right = direction == View.FOCUS_DOWN;
        int width = getWidth();
        mTempRect.left = 0;
        mTempRect.right = width;
        if (right) {
          int count = getChildCount();
          if (count > 0) {
            View view = getChildAt(count - 1);
            mTempRect.right = view.getBottom();
            mTempRect.left = mTempRect.right - width;
          }
        }
        return scrollAndFocus(0, 0, 0, direction, mTempRect.top, mTempRect.bottom);
      }
    }
  
    /**
     * Handle scrolling in response to an up or down arrow click.
     *
     * @param direction The direction corresponding to the arrow key that was pressed
     * @return True if we consumed the event, false otherwise
     */
    public boolean arrowScroll(int direction, boolean horizontal) {
      View currentFocused = findFocus();
      if (currentFocused == this) currentFocused = null;
      View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);
      final int maxJump = horizontal ? getMaxScrollAmountHorizontal() : getMaxScrollAmountVertical();
  
      if (!horizontal) {
        if (nextFocused != null) {
          nextFocused.getDrawingRect(mTempRect);
          offsetDescendantRectToMyCoords(nextFocused, mTempRect);
          int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
          doScroll(0, scrollDelta);
          nextFocused.requestFocus(direction);
        } else {
          // no new focus
          int scrollDelta = maxJump;
          if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) {
            scrollDelta = getScrollY();
          } else if (direction == View.FOCUS_DOWN) {
            if (getChildCount() > 0) {
              int daBottom = getChildAt(0).getBottom();
              int screenBottom = getScrollY() + getHeight();
              if (daBottom - screenBottom < maxJump) {
                scrollDelta = daBottom - screenBottom;
              }
            }
          }
          if (scrollDelta == 0) {
            return false;
          }
          doScroll(0, direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta);
        }
      } else {
        if (nextFocused != null) {
          nextFocused.getDrawingRect(mTempRect);
          offsetDescendantRectToMyCoords(nextFocused, mTempRect);
          int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
          doScroll(scrollDelta, 0);
          nextFocused.requestFocus(direction);
        } else {
          // no new focus
          int scrollDelta = maxJump;
          if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) {
            scrollDelta = getScrollY();
          } else if (direction == View.FOCUS_DOWN) {
            if (getChildCount() > 0) {
              int daBottom = getChildAt(0).getBottom();
              int screenBottom = getScrollY() + getHeight();
              if (daBottom - screenBottom < maxJump) {
                scrollDelta = daBottom - screenBottom;
              }
            }
          }
          if (scrollDelta == 0) {
            return false;
          }
          doScroll(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta, 0);
        }
      }
      return true;
    }
  
    /**
     * Like {@link #scrollTo}, but scroll smoothly instead of immediately.
     *
     * @param x the position where to scroll on the X axis
     * @param y the position where to scroll on the Y axis
     */
    public final void smoothScrollTo(int x, int y) {
      smoothScrollBy(x - getScrollX(), y - getScrollY());
    }
  
    /**
     * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
     *
     * @param dx the number of pixels to scroll by on the X axis
     * @param dy the number of pixels to scroll by on the Y axis
     */
    public final void smoothScrollBy(int dx, int dy) {
      long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;
      if (duration > ANIMATED_SCROLL_GAP) {
        mScroller.startScroll(getScrollX(), getScrollY(), dx, dy);
        awakenScrollBars(mScroller.getDuration());
        invalidate();
      } else {
        if (!mScroller.isFinished()) {
          mScroller.abortAnimation();
        }
        scrollBy(dx, dy);
      }
      mLastScroll = AnimationUtils.currentAnimationTimeMillis();
    }
  
    @Override
    public void requestChildFocus(View child, View focused) {
      if (!mTwoDScrollViewMovedFocus) {
        if (!mIsLayoutDirty) {
          scrollToChild(focused);
        } else {
          // The child may not be laid out yet, we can't compute the scroll yet
          mChildToScrollTo = focused;
        }
      }
      super.requestChildFocus(child, focused);
    }
  
    /**
     * Scrolls the view to the given child.
     *
     * @param child the View to scroll to
     */
    private void scrollToChild(View child) {
      child.getDrawingRect(mTempRect);
      /* Offset from child's local coordinates to TwoDScrollView coordinates */
      offsetDescendantRectToMyCoords(child, mTempRect);
      int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
      if (scrollDelta != 0) {
        scrollBy(0, scrollDelta);
      }
    }
  
    /**
     * Compute the amount to scroll in the Y direction in order to get a rectangle completely on the
     * screen (or, if taller than the screen, at least the first screen size chunk of it).
     *
     * @param rect The rect.
     * @return The scroll delta.
     */
    protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
      if (getChildCount() == 0) return 0;
      int height = getHeight();
      int screenTop = getScrollY();
      int screenBottom = screenTop + height;
      int fadingEdge = getVerticalFadingEdgeLength();
      // leave room for top fading edge as long as rect isn't at very top
      if (rect.top > 0) {
        screenTop += fadingEdge;
      }
  
      // leave room for bottom fading edge as long as rect isn't at very bottom
      if (rect.bottom < getChildAt(0).getHeight()) {
        screenBottom -= fadingEdge;
      }
      int scrollYDelta = 0;
      if (rect.bottom > screenBottom && rect.top > screenTop) {
        // need to move down to get it in view: move down just enough so
        // that the entire rectangle is in view (or at least the first
        // screen size chunk).
        if (rect.height() > height) {
          // just enough to get screen size chunk on
          scrollYDelta += (rect.top - screenTop);
        } else {
          // get entire rect at bottom of screen
          scrollYDelta += (rect.bottom - screenBottom);
        }
  
        // make sure we aren't scrolling beyond the end of our content
        int bottom = getChildAt(0).getBottom();
        int distanceToBottom = bottom - screenBottom;
        scrollYDelta = Math.min(scrollYDelta, distanceToBottom);
  
      } else if (rect.top < screenTop && rect.bottom < screenBottom) {
        // need to move up to get it in view: move up just enough so that
        // entire rectangle is in view (or at least the first screen
        // size chunk of it).
  
        if (rect.height() > height) {
          // screen size chunk
          scrollYDelta -= (screenBottom - rect.bottom);
        } else {
          // entire rect at top
          scrollYDelta -= (screenTop - rect.top);
        }
  
        // make sure we aren't scrolling any further than the top our content
        scrollYDelta = Math.max(scrollYDelta, -getScrollY());
      }
      return scrollYDelta;
    }
  
    @Override
    public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
      // offset into coordinate space of this scroll view
      rectangle.offset(child.getLeft() - child.getScrollX(), child.getTop() - child.getScrollY());
      return scrollToChildRect(rectangle, immediate);
    }
  
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
      // Let the focused view and/or our descendants get the key first
      boolean handled = super.dispatchKeyEvent(event);
      if (handled) {
        return true;
      }
      return executeKeyEvent(event);
    }
  
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
      /*
       * This method JUST determines whether we want to intercept the motion.
       * If we return true, onMotionEvent will be called and we do the actual
       * scrolling there.
       *
       * Shortcut the most recurring case: the user is in the dragging
       * state and he is moving his finger.  We want to intercept this
       * motion.
       */
      final int action = ev.getAction();
      if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
        return true;
      }
      if (!canScroll()) {
        mIsBeingDragged = false;
        return false;
      }
      final float y = ev.getY();
      final float x = ev.getX();
      switch (action) {
        case MotionEvent.ACTION_MOVE:
          /*
           * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
           * whether the user has moved far enough from his original down touch.
           */
          /*
           * Locally do absolute value. mLastMotionY is set to the y value
           * of the down event.
           */
          final int yDiff = (int) Math.abs(y - mLastMotionY);
          final int xDiff = (int) Math.abs(x - mLastMotionX);
          if (yDiff > mTouchSlop || xDiff > mTouchSlop) {
            mIsBeingDragged = true;
          }
          break;
  
        case MotionEvent.ACTION_DOWN:
          /* Remember location of down touch */
          mLastMotionY = y;
          mLastMotionX = x;
  
          /*
           * If being flinged and user touches the screen, initiate drag;
           * otherwise don't.  mScroller.isFinished should be false when
           * being flinged.
           */
          mIsBeingDragged = !mScroller.isFinished();
          break;
  
        case MotionEvent.ACTION_CANCEL:
        case MotionEvent.ACTION_UP:
          /* Release the drag */
          mIsBeingDragged = false;
          break;
      }
  
      /*
       * The only time we want to intercept motion events is if we are in the
       * drag mode.
       */
      return mIsBeingDragged;
    }
  
    /**
     * @return Returns true this TwoDScrollView can be scrolled
     */
    private boolean canScroll() {
      View child = getChildAt(0);
      if (child != null) {
        int childHeight = child.getHeight();
        int childWidth = child.getWidth();
        return (getHeight() < childHeight + getPaddingTop() + getPaddingBottom())
            || (getWidth() < childWidth + getPaddingLeft() + getPaddingRight());
      }
      return false;
    }
  
    /**
     * When looking for focus in children of a scroll view, need to be a little more careful not to
     * give focus to something that is scrolled off screen.
     *
     * <p>This is more expensive than the default {@link android.view.ViewGroup} implementation,
     * otherwise this behavior might have been made the default.
     */
    @Override
    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
      // convert from forward / backward notation to up / down / left / right
      // (ugh).
      if (direction == View.FOCUS_FORWARD) {
        direction = View.FOCUS_DOWN;
      } else if (direction == View.FOCUS_BACKWARD) {
        direction = View.FOCUS_UP;
      }
  
      final View nextFocus =
          previouslyFocusedRect == null
              ? FocusFinder.getInstance().findNextFocus(this, null, direction)
              : FocusFinder.getInstance()
                  .findNextFocusFromRect(this, previouslyFocusedRect, direction);
  
      if (nextFocus == null) {
        return false;
      }
  
      return nextFocus.requestFocus(direction, previouslyFocusedRect);
    }
  
    @Override
    public void addView(View child) {
      if (getChildCount() > 0) {
        throw new IllegalStateException("TwoDScrollView can host only one direct child");
      }
      super.addView(child);
    }
  
    @Override
    public void addView(View child, int index) {
      if (getChildCount() > 0) {
        throw new IllegalStateException("TwoDScrollView can host only one direct child");
      }
      super.addView(child, index);
    }
  
    @Override
    public void addView(View child, ViewGroup.LayoutParams params) {
      if (getChildCount() > 0) {
        throw new IllegalStateException("TwoDScrollView can host only one direct child");
      }
      super.addView(child, params);
    }
  
    @Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
      if (getChildCount() > 0) {
        throw new IllegalStateException("TwoDScrollView can host only one direct child");
      }
      super.addView(child, index, params);
    }
  
    @Override
    protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
      ViewGroup.LayoutParams lp = child.getLayoutParams();
      int childWidthMeasureSpec;
      int childHeightMeasureSpec;
  
      childWidthMeasureSpec =
          getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() + getPaddingRight(), lp.width);
      childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
  
      child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
    }
  
    @Override
    protected void measureChildWithMargins(
        View child,
        int parentWidthMeasureSpec,
        int widthUsed,
        int parentHeightMeasureSpec,
        int heightUsed) {
      final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
      final int childWidthMeasureSpec =
          MeasureSpec.makeMeasureSpec(lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED);
      final int childHeightMeasureSpec =
          MeasureSpec.makeMeasureSpec(lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED);
  
      child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
    }
  
    /**
     * If rect is off screen, scroll just enough to get it (or at least the first screen size chunk of
     * it) on screen.
     *
     * @param rect The rectangle.
     * @param immediate True to scroll immediately without animation
     * @return true if scrolling was performed
     */
    private boolean scrollToChildRect(Rect rect, boolean immediate) {
      final int delta = computeScrollDeltaToGetChildRectOnScreen(rect);
      final boolean scroll = delta != 0;
      if (scroll) {
        if (immediate) {
          scrollBy(0, delta);
        } else {
          smoothScrollBy(0, delta);
        }
      }
      return scroll;
    }
  
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
      super.onLayout(changed, l, t, r, b);
      mIsLayoutDirty = false;
      // Give a child focus if it needs it
      if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) {
        scrollToChild(mChildToScrollTo);
      }
      mChildToScrollTo = null;
  
      // Calling this with the present values causes it to re-clam them
      scrollTo(getScrollX(), getScrollY());
    }
  
    /**
     * Scrolls the view to make the area defined by <code>top</code> and <code>bottom</code> visible.
     * This method attempts to give the focus to a component visible in this area. If no component can
     * be focused in the new visible area, the focus is reclaimed by this scrollview.
     *
     * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} to go upward {@link
     *     android.view.View#FOCUS_DOWN} to downward
     * @param top the top offset of the new area to be made visible
     * @param bottom the bottom offset of the new area to be made visible
     * @return true if the key event is consumed by this method, false otherwise
     */
    private boolean scrollAndFocus(
        int directionY, int top, int bottom, int directionX, int left, int right) {
      boolean handled = true;
      int height = getHeight();
      int containerTop = getScrollY();
      int containerBottom = containerTop + height;
      boolean up = directionY == View.FOCUS_UP;
      int width = getWidth();
      int containerLeft = getScrollX();
      int containerRight = containerLeft + width;
      boolean leftwards = directionX == View.FOCUS_UP;
      View newFocused = findFocusableViewInBounds(up, top, bottom, leftwards, left, right);
      if (newFocused == null) {
        newFocused = this;
      }
      if ((top >= containerTop && bottom <= containerBottom)
          || (left >= containerLeft && right <= containerRight)) {
        handled = false;
      } else {
        int deltaY = up ? (top - containerTop) : (bottom - containerBottom);
        int deltaX = leftwards ? (left - containerLeft) : (right - containerRight);
        doScroll(deltaX, deltaY);
      }
      if (newFocused != findFocus() && newFocused.requestFocus(directionY)) {
        mTwoDScrollViewMovedFocus = true;
        mTwoDScrollViewMovedFocus = false;
      }
      return handled;
    }
  
    /** Return true if child is an descendant of parent, (or equal to the parent). */
    private boolean isViewDescendantOf(View child, View parent) {
      if (child == parent) {
        return true;
      }
  
      final ViewParent theParent = child.getParent();
      return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent);
    }
  }
  