/** * Actions a Pull Event * * @return true if the Event has been handled, false if there has been no change */ private void pullEvent() { final int newScrollValue; final int itemDimension; final float initialMotionValue, lastMotionValue; switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: initialMotionValue = mInitialMotionX; lastMotionValue = mLastMotionX; break; case VERTICAL: default: initialMotionValue = mInitialMotionY; lastMotionValue = mLastMotionY; break; } switch (mCurrentMode) { case PULL_FROM_END: newScrollValue = Math.round(Math.max(initialMotionValue - lastMotionValue, 0) / FRICTION); itemDimension = getFooterSize(); break; case PULL_FROM_START: default: newScrollValue = Math.round(Math.min(initialMotionValue - lastMotionValue, 0) / FRICTION); itemDimension = getHeaderSize(); break; } setHeaderScroll(newScrollValue); if (newScrollValue != 0 && !isRefreshing()) { float scale = Math.abs(newScrollValue) / (float) itemDimension; switch (mCurrentMode) { case PULL_FROM_END: mFooterLayout.onPull(scale); break; case PULL_FROM_START: default: mHeaderLayout.onPull(scale); break; } if (mState != State.PULL_TO_REFRESH && itemDimension >= Math.abs(newScrollValue)) { setState(State.PULL_TO_REFRESH); } else if (mState == State.PULL_TO_REFRESH && itemDimension < Math.abs(newScrollValue)) { setState(State.RELEASE_TO_REFRESH); } } }