@Override
  public void onUIPositionChange(
      PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {

    final int mOffsetToRefresh = frame.getOffsetToRefresh();
    final int currentPos = ptrIndicator.getCurrentPosY();
    final int lastPos = ptrIndicator.getLastPosY();

    if (currentPos < mOffsetToRefresh && lastPos >= mOffsetToRefresh) {
      if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
        crossRotateLineFromBottomUnderTouch(frame);
        if (mRotateView != null) {
          mRotateView.clearAnimation();
          mRotateView.startAnimation(mReverseFlipAnimation);
        }
      }
    } else if (currentPos > mOffsetToRefresh && lastPos <= mOffsetToRefresh) {
      if (isUnderTouch && status == PtrFrameLayout.PTR_STATUS_PREPARE) {
        crossRotateLineFromTopUnderTouch(frame);
        if (mRotateView != null) {
          mRotateView.clearAnimation();
          mRotateView.startAnimation(mFlipAnimation);
        }
      }
    }
  }
  private void onRelease(boolean stayForLoading) {

    tryToPerformRefresh();

    if (mStatus == PTR_STATUS_LOADING) {
      // keep header for fresh
      if (mKeepHeaderWhenRefresh) {
        // scroll header back
        if (mPtrIndicator.isOverOffsetToKeepHeaderWhileLoading() && !stayForLoading) {
          mScrollChecker.tryToScrollTo(
              mPtrIndicator.getOffsetToKeepHeaderWhileLoading(), mDurationToClose);
        } else {
          // do nothing
        }
      } else {
        tryScrollBackToTopWhileLoading();
      }
    } else {
      if (mStatus == PTR_STATUS_COMPLETE) {
        notifyUIRefreshComplete(false);
      } else {
        tryScrollBackToTopAbortRefresh();
      }
    }
  }
  private boolean tryToPerformRefresh() {
    if (mStatus != PTR_STATUS_PREPARE) {
      return false;
    }

    //
    if ((mPtrIndicator.isOverOffsetToKeepHeaderWhileLoading() && isAutoRefresh())
        || mPtrIndicator.isOverOffsetToRefresh()) {
      mStatus = PTR_STATUS_LOADING;
      performRefresh();
    }
    return false;
  }
  private void layoutChildren() {
    int offsetX = mPtrIndicator.getCurrentPosY();
    int paddingLeft = getPaddingLeft();
    int paddingTop = getPaddingTop();

    if (mHeaderView != null) {
      MarginLayoutParams lp = (MarginLayoutParams) mHeaderView.getLayoutParams();
      final int left = paddingLeft + lp.leftMargin;
      final int top = paddingTop + lp.topMargin + offsetX - mHeaderHeight;
      final int right = left + mHeaderView.getMeasuredWidth();
      final int bottom = top + mHeaderView.getMeasuredHeight();
      mHeaderView.layout(left, top, right, bottom);
      if (DEBUG && DEBUG_LAYOUT) {
        PtrCLog.d(LOG_TAG, "onLayout header: %s %s %s %s", left, top, right, bottom);
      }
    }
    if (mContent != null) {
      if (isPinContent()) {
        offsetX = 0;
      }
      MarginLayoutParams lp = (MarginLayoutParams) mContent.getLayoutParams();
      final int left = paddingLeft + lp.leftMargin;
      final int top = paddingTop + lp.topMargin + offsetX;
      final int right = left + mContent.getMeasuredWidth();
      final int bottom = top + mContent.getMeasuredHeight();
      if (DEBUG && DEBUG_LAYOUT) {
        PtrCLog.d(LOG_TAG, "onLayout content: %s %s %s %s", left, top, right, bottom);
      }
      mContent.layout(left, top, right, bottom);
    }
  }
 protected void onPtrScrollFinish() {
   if (mPtrIndicator.hasLeftStartPosition() && isAutoRefresh()) {
     if (DEBUG) {
       PtrCLog.d(LOG_TAG, "call onRelease after scroll finish");
     }
     onRelease(true);
   }
 }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    if (DEBUG && DEBUG_LAYOUT) {
      PtrCLog.d(
          LOG_TAG,
          "onMeasure frame: width: %s, height: %s, padding: %s %s %s %s",
          getMeasuredHeight(),
          getMeasuredWidth(),
          getPaddingLeft(),
          getPaddingRight(),
          getPaddingTop(),
          getPaddingBottom());
    }

    if (mHeaderView != null) {
      measureChildWithMargins(mHeaderView, widthMeasureSpec, 0, heightMeasureSpec, 0);
      MarginLayoutParams lp = (MarginLayoutParams) mHeaderView.getLayoutParams();
      mHeaderHeight = mHeaderView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
      mPtrIndicator.setHeaderHeight(mHeaderHeight);
    }

    if (mContent != null) {
      measureContentView(mContent, widthMeasureSpec, heightMeasureSpec);
      if (DEBUG && DEBUG_LAYOUT) {
        MarginLayoutParams lp = (MarginLayoutParams) mContent.getLayoutParams();
        PtrCLog.d(
            LOG_TAG,
            "onMeasure content, width: %s, height: %s, margin: %s %s %s %s",
            getMeasuredWidth(),
            getMeasuredHeight(),
            lp.leftMargin,
            lp.topMargin,
            lp.rightMargin,
            lp.bottomMargin);
        PtrCLog.d(
            LOG_TAG,
            "onMeasure, currentPos: %s, lastPos: %s, top: %s",
            mPtrIndicator.getCurrentPosY(),
            mPtrIndicator.getLastPosY(),
            mContent.getTop());
      }
    }
  }
  /**
   * if deltaY > 0, move the content down
   *
   * @param deltaY
   */
  private void movePos(float deltaY) {
    // has reached the top
    if ((deltaY < 0 && mPtrIndicator.isInStartPosition())) {
      if (DEBUG) {
        PtrCLog.e(LOG_TAG, String.format("has reached the top"));
      }
      return;
    }

    int to = mPtrIndicator.getCurrentPosY() + (int) deltaY;

    // over top
    if (mPtrIndicator.willOverTop(to)) {
      if (DEBUG) {
        PtrCLog.e(LOG_TAG, String.format("over top"));
      }
      to = PtrIndicator.POS_START;
    }

    mPtrIndicator.setCurrentPos(to);
    int change = to - mPtrIndicator.getLastPosY();
    updatePos(change);
  }
  /**
   * Do real refresh work. If there is a hook, execute the hook first.
   *
   * @param ignoreHook
   */
  private void notifyUIRefreshComplete(boolean ignoreHook) {
    /**
     * After hook operation is done, {@link #notifyUIRefreshComplete} will be call in resume action
     * to ignore hook.
     */
    if (mPtrIndicator.hasLeftStartPosition() && !ignoreHook && mRefreshCompleteHook != null) {
      if (DEBUG) {
        PtrCLog.d(LOG_TAG, "notifyUIRefreshComplete mRefreshCompleteHook run.");
      }

      mRefreshCompleteHook.takeOver();
      return;
    }
    if (mPtrUIHandlerHolder.hasHandler()) {
      if (DEBUG) {
        PtrCLog.i(LOG_TAG, "PtrUIHandler: onUIRefreshComplete");
      }
      mPtrUIHandlerHolder.onUIRefreshComplete(this);
    }
    mPtrIndicator.onUIRefreshComplete();
    tryScrollBackToTopAfterComplete();
    tryToNotifyReset();
  }
  public PtrFrameLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    mPtrIndicator = new PtrIndicator();

    TypedArray arr = context.obtainStyledAttributes(attrs, R.styleable.PtrFrameLayout, 0, 0);
    if (arr != null) {

      mHeaderId = arr.getResourceId(R.styleable.PtrFrameLayout_ptr_header, mHeaderId);
      mContainerId = arr.getResourceId(R.styleable.PtrFrameLayout_ptr_content, mContainerId);

      mPtrIndicator.setResistance(
          arr.getFloat(R.styleable.PtrFrameLayout_ptr_resistance, mPtrIndicator.getResistance()));

      mDurationToClose =
          arr.getInt(R.styleable.PtrFrameLayout_ptr_duration_to_close, mDurationToClose);
      mDurationToCloseHeader =
          arr.getInt(
              R.styleable.PtrFrameLayout_ptr_duration_to_close_header, mDurationToCloseHeader);

      float ratio = mPtrIndicator.getRatioOfHeaderToHeightRefresh();
      ratio = arr.getFloat(R.styleable.PtrFrameLayout_ptr_ratio_of_header_height_to_refresh, ratio);
      mPtrIndicator.setRatioOfHeaderHeightToRefresh(ratio);

      mKeepHeaderWhenRefresh =
          arr.getBoolean(
              R.styleable.PtrFrameLayout_ptr_keep_header_when_refresh, mKeepHeaderWhenRefresh);

      mPullToRefresh = arr.getBoolean(R.styleable.PtrFrameLayout_ptr_pull_to_fresh, mPullToRefresh);
      arr.recycle();
    }

    mScrollChecker = new ScrollChecker();

    final ViewConfiguration conf = ViewConfiguration.get(getContext());
    mPagingTouchSlop = conf.getScaledTouchSlop() * 2;
  }
 /** If at the top and not in loading, reset */
 private boolean tryToNotifyReset() {
   if ((mStatus == PTR_STATUS_COMPLETE || mStatus == PTR_STATUS_PREPARE)
       && mPtrIndicator.isInStartPosition()) {
     if (mPtrUIHandlerHolder.hasHandler()) {
       mPtrUIHandlerHolder.onUIReset(this);
       if (DEBUG) {
         PtrCLog.i(LOG_TAG, "PtrUIHandler: onUIReset");
       }
     }
     mStatus = PTR_STATUS_INIT;
     clearFlag();
     return true;
   }
   return false;
 }
  @Override
  public void onUIPositionChange(
      PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {

    float percent = Math.min(1f, ptrIndicator.getCurrentPercent());

    if (status == PtrFrameLayout.PTR_STATUS_PREPARE) {
      mDrawable.setAlpha((int) (255 * percent));
      mDrawable.showArrow(true);

      float strokeStart = ((percent) * .8f);
      mDrawable.setStartEndTrim(0f, Math.min(0.8f, strokeStart));
      mDrawable.setArrowScale(Math.min(1f, percent));

      // magic
      float rotation = (-0.25f + .4f * percent + percent * 2) * .5f;
      mDrawable.setProgressRotation(rotation);
      invalidate();
    }
  }
  public void autoRefresh(boolean atOnce, int duration) {

    if (mStatus != PTR_STATUS_INIT) {
      return;
    }

    mFlag |= atOnce ? FLAG_AUTO_REFRESH_AT_ONCE : FLAG_AUTO_REFRESH_BUT_LATER;

    mStatus = PTR_STATUS_PREPARE;
    if (mPtrUIHandlerHolder.hasHandler()) {
      mPtrUIHandlerHolder.onUIRefreshPrepare(this);
      if (DEBUG) {
        PtrCLog.i(LOG_TAG, "PtrUIHandler: onUIRefreshPrepare, mFlag %s", mFlag);
      }
    }
    mScrollChecker.tryToScrollTo(mPtrIndicator.getOffsetToRefresh(), duration);
    if (atOnce) {
      mStatus = PTR_STATUS_LOADING;
      performRefresh();
    }
  }
 public void setPtrIndicator(PtrIndicator slider) {
   if (mPtrIndicator != null && mPtrIndicator != slider) {
     slider.convertFrom(mPtrIndicator);
   }
   mPtrIndicator = slider;
 }
  @Override
  public boolean dispatchTouchEvent(MotionEvent e) {
    if (!isEnabled() || mContent == null || mHeaderView == null) {
      return dispatchTouchEventSupper(e);
    }
    int action = e.getAction();
    switch (action) {
      case MotionEvent.ACTION_UP:
      case MotionEvent.ACTION_CANCEL:
        mPtrIndicator.onRelease();
        if (mPtrIndicator.hasLeftStartPosition()) {
          if (DEBUG) {
            PtrCLog.d(LOG_TAG, "call onRelease when user release");
          }
          onRelease(false);
          if (mPtrIndicator.hasMovedAfterPressedDown()) {
            sendCancelEvent();
            return true;
          }
          return dispatchTouchEventSupper(e);
        } else {
          return dispatchTouchEventSupper(e);
        }

      case MotionEvent.ACTION_DOWN:
        mHasSendCancelEvent = false;
        mPtrIndicator.onPressDown(e.getX(), e.getY());

        mScrollChecker.abortIfWorking();

        mPreventForHorizontal = false;
        // The cancel event will be sent once the position is moved.
        // So let the event pass to children.
        // fix #93, #102
        dispatchTouchEventSupper(e);
        return true;

      case MotionEvent.ACTION_MOVE:
        mLastMoveEvent = e;
        mPtrIndicator.onMove(e.getX(), e.getY());
        float offsetX = mPtrIndicator.getOffsetX();
        float offsetY = mPtrIndicator.getOffsetY();

        if (mDisableWhenHorizontalMove
            && !mPreventForHorizontal
            && (Math.abs(offsetX) > mPagingTouchSlop && Math.abs(offsetX) > Math.abs(offsetY))) {
          if (mPtrIndicator.isInStartPosition()) {
            mPreventForHorizontal = true;
          }
        }
        if (mPreventForHorizontal) {
          return dispatchTouchEventSupper(e);
        }

        boolean moveDown = offsetY > 0;
        boolean moveUp = !moveDown;
        boolean canMoveUp = mPtrIndicator.hasLeftStartPosition();

        if (DEBUG) {
          boolean canMoveDown =
              mPtrHandler != null && mPtrHandler.checkCanDoRefresh(this, mContent, mHeaderView);
          PtrCLog.v(
              LOG_TAG,
              "ACTION_MOVE: offsetY:%s, currentPos: %s, moveUp: %s, canMoveUp: %s, moveDown: %s: canMoveDown: %s",
              offsetY,
              mPtrIndicator.getCurrentPosY(),
              moveUp,
              canMoveUp,
              moveDown,
              canMoveDown);
        }

        // disable move when header not reach top
        if (moveDown
            && mPtrHandler != null
            && !mPtrHandler.checkCanDoRefresh(this, mContent, mHeaderView)) {
          return dispatchTouchEventSupper(e);
        }

        if ((moveUp && canMoveUp) || moveDown) {
          movePos(offsetY);
          return true;
        }
    }
    return dispatchTouchEventSupper(e);
  }
 @SuppressWarnings({"unused"})
 public void setOffsetToKeepHeaderWhileLoading(int offset) {
   mPtrIndicator.setOffsetToKeepHeaderWhileLoading(offset);
 }
 @SuppressWarnings({"unused"})
 public int getOffsetToKeepHeaderWhileLoading() {
   return mPtrIndicator.getOffsetToKeepHeaderWhileLoading();
 }
 @SuppressWarnings({"unused"})
 public float getRatioOfHeaderToHeightRefresh() {
   return mPtrIndicator.getRatioOfHeaderToHeightRefresh();
 }
 @SuppressWarnings({"unused"})
 public void setOffsetToRefresh(int offset) {
   mPtrIndicator.setOffsetToRefresh(offset);
 }
 public int getOffsetToRefresh() {
   return mPtrIndicator.getOffsetToRefresh();
 }
 public void setRatioOfHeaderHeightToRefresh(float ratio) {
   mPtrIndicator.setRatioOfHeaderHeightToRefresh(ratio);
 }
  private void updatePos(int change) {
    if (change == 0) {
      return;
    }

    boolean isUnderTouch = mPtrIndicator.isUnderTouch();

    // once moved, cancel event will be sent to child
    if (isUnderTouch && !mHasSendCancelEvent && mPtrIndicator.hasMovedAfterPressedDown()) {
      mHasSendCancelEvent = true;
      sendCancelEvent();
    }

    // leave initiated position or just refresh complete
    if ((mPtrIndicator.hasJustLeftStartPosition() && mStatus == PTR_STATUS_INIT)
        || (mPtrIndicator.goDownCrossFinishPosition()
            && mStatus == PTR_STATUS_COMPLETE
            && isEnabledNextPtrAtOnce())) {

      mStatus = PTR_STATUS_PREPARE;
      mPtrUIHandlerHolder.onUIRefreshPrepare(this);
      if (DEBUG) {
        PtrCLog.i(LOG_TAG, "PtrUIHandler: onUIRefreshPrepare, mFlag %s", mFlag);
      }
    }

    // back to initiated position
    if (mPtrIndicator.hasJustBackToStartPosition()) {
      tryToNotifyReset();

      // recover event to children
      if (isUnderTouch) {
        sendDownEvent();
      }
    }

    // Pull to Refresh
    if (mStatus == PTR_STATUS_PREPARE) {
      // reach fresh height while moving from top to bottom
      if (isUnderTouch
          && !isAutoRefresh()
          && mPullToRefresh
          && mPtrIndicator.crossRefreshLineFromTopToBottom()) {
        tryToPerformRefresh();
      }
      // reach header height while auto refresh
      if (performAutoRefreshButLater()
          && mPtrIndicator.hasJustReachedHeaderHeightFromTopToBottom()) {
        tryToPerformRefresh();
      }
    }

    if (DEBUG) {
      PtrCLog.v(
          LOG_TAG,
          "updatePos: change: %s, current: %s last: %s, top: %s, headerHeight: %s",
          change,
          mPtrIndicator.getCurrentPosY(),
          mPtrIndicator.getLastPosY(),
          mContent.getTop(),
          mHeaderHeight);
    }

    mHeaderView.offsetTopAndBottom(change);
    if (!isPinContent()) {
      mContent.offsetTopAndBottom(change);
    }
    invalidate();

    if (mPtrUIHandlerHolder.hasHandler()) {
      mPtrUIHandlerHolder.onUIPositionChange(this, isUnderTouch, mStatus, mPtrIndicator);
    }
    onPositionChange(isUnderTouch, mStatus, mPtrIndicator);
  }
 public void setResistance(float resistance) {
   mPtrIndicator.setResistance(resistance);
 }
 @SuppressWarnings({"unused"})
 public float getResistance() {
   return mPtrIndicator.getResistance();
 }
 /** Scroll back to to if is not under touch */
 private void tryScrollBackToTop() {
   if (!mPtrIndicator.isUnderTouch()) {
     mScrollChecker.tryToScrollTo(PtrIndicator.POS_START, mDurationToCloseHeader);
   }
 }