NumberPicker.java 文件源码

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    if (!isEnabled()) {
        return false;
    }
    final int action = event.getActionMasked();
    switch (action) {
        case MotionEvent.ACTION_DOWN: {
            removeAllCallbacks();
            mInputText.setVisibility(View.INVISIBLE);
            mLastDownOrMoveEventY = mLastDownEventY = event.getY();
            mLastDownEventTime = event.getEventTime();
            mIngonreMoveEvents = false;
            if (mLastDownEventY < mTopSelectionDividerTop) {
                if (mScrollState == OnScrollListener.SCROLL_STATE_IDLE) {
                    mPressedStateHelper.buttonPressDelayed(PressedStateHelper.BUTTON_DECREMENT);
                }
            } else if (mLastDownEventY > mBottomSelectionDividerBottom) {
                if (mScrollState == OnScrollListener.SCROLL_STATE_IDLE) {
                    mPressedStateHelper.buttonPressDelayed(PressedStateHelper.BUTTON_INCREMENT);
                }
            }
            getParent().requestDisallowInterceptTouchEvent(true);
            if (!mFlingScroller.isFinished()) {
                mFlingScroller.forceFinished(true);
                mAdjustScroller.forceFinished(true);
                onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
            } else if (!mAdjustScroller.isFinished()) {
                mFlingScroller.forceFinished(true);
                mAdjustScroller.forceFinished(true);
            } else if (mLastDownEventY < mTopSelectionDividerTop) {
                postChangeCurrentByOneFromLongPress(false, ViewConfiguration.getLongPressTimeout());
            } else if (mLastDownEventY > mBottomSelectionDividerBottom) {
                postChangeCurrentByOneFromLongPress(true, ViewConfiguration.getLongPressTimeout());
            }
            return true;
        }
    }
    return false;
}