Add scrollbar support for scroll flow #1130
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…ction with different writing modes.
…-container and iframe for scrollbar.
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Add an option scrollbarWidth to control reserved space between epub-container and iframe for scrollbar for scroll flow. Then, we can use these CSS codes to enable horizontal or vertical scrollbar:
https://github.com/MrMYHuang/cbetar2/blob/master/src/pages/EPubViewPage.css
Without the reserved space, epub-container's scrollbar overlaps with iframe content ☹ The screenshot shows the problem that the blue horizontal scrollbar overlaps the texts:
With a reserved space, the overlap problem is fixed:
