public async Task<PageInfo> PreparePrevPage()
{
if (_currentPage == null)
return null;
string startText = string.Empty;
if (_currentPage != null)
{
startText = _currentPage.StartText;
}
var page = await _pageLoader.GetPreviousPageAsync(_currentPage.FirstTokenID, startText);
if (page == null || page.FirstTokenID < 0)
return null;
_prevPage = page;
var bgBuilder = new PageRenderer(_images);
_bookView.PreviousTexts.Clear();
_bookView.PreviousLinks.Clear();
await bgBuilder.RenderPageAsync(new RenderPageRequest()
{
Page = page,
Panel = _bookView.GetPrevPagePanel(),
Texts = _bookView.PreviousTexts,
Links= _bookView.PreviousLinks,
Book = _bookModel,
Bookmarks = _bookView.Bookmarks
});
return page;
}
public async Task<PageInfo> PrepareNextPage()
{
string lastText = string.Empty;
if (_currentPage != null)
{
lastText = _currentPage.LastTextPart;
}
int nextTokenId = _currentPage?.LastTokenID + 1 ?? _offset;
var page = await _pageLoader.GetPageAsync(nextTokenId, lastText);
if (page == null || page.FirstTokenID < 0)
return null;
_nextPage = page;
var bgBuilder = new PageRenderer(_images);
_bookView.NextTexts.Clear();
_bookView.NextLinks.Clear();
await bgBuilder.RenderPageAsync(new RenderPageRequest()
{
Page = page,
Panel = _bookView.GetNextPagePanel(),
Texts = _bookView.NextTexts,
Book = _bookModel,
Links = _bookView.NextLinks,
Bookmarks = _bookView.Bookmarks
});
return page;
}
