- 确定中间行的坐标绘制,其它行则由 行号加行高控制
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行高距离 内 中间行向上移到一行的时间比
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确认行的偏移时长,中间行上移一行可用时间 是由 下一行(即将成为中间行)的起始时间-当前中间行的偏移时长
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偏移百分比 是由当前播放进度-中间行的起始时间
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偏移量 是由偏移百分比 * 行高
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当前滚动距离超过行高时,重新确定中间行
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中间行变换后,滚动坐标重新计算
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