private async Task <OpenResult> OpenFileAsText(string fileString, BookLocation location)
{
await Task.Delay(0);
Logger.Log($"MainEpubReader: file is a text string; convert to html");
EpubBook = TextWizard.TextToEpub(fileString);
if (location == null)
{
var chapter = EpubWizard.GetFirstChapter(EpubBook.TableOfContents);
if (chapter != null)
{
location = EpubChapterData.FromChapter(chapter);
}
}
if (location != null)
{
Logger.Log($"MainEpubReader: Show Text: About to move to location as needed. {location}");
UserNavigatedToArgument = location;
NavigateTo(ControlId, location); // We won't get a hairpin navigation callback
}
return(OpenResult.OK);
}
private void UserDidNavigationRequest(EpubChapterData chapter)
{
if (chapter == null)
{
return;
}
var nav = Navigator.Get();
BookLocation location = null;
if (chapter == Chapters[0])
{
// First one is special: we always go to the very start of the book, including stuff that's not in
// the classic table of contents. For example, Gutenberg Campfire Girls Station Island has a cover that's
// not in the TOC but which is in the inner.SpecialResources.HtmlInReadingOrder and which is placed first.
// Additionally, that book also has the weird thing that the ID for the first section (in the TOC) is
// near the end of the section, so when you click on it, it scrolls to there, but then the next TOC entry
// (chapter 1) is visible near the top, and so the selection jumps to there.
location = new BookLocation(0, 0); // first HTML page, at the very top.
}
else
{
location = EpubChapterData.FromChapter(chapter);
}
nav.UserNavigatedTo(ControlId, location);
}
public static BookLocation FromChapter(EpubChapterData chapter)
{
return(new BookLocation()
{
Location = chapter.Anchor,
HtmlFileName = chapter.FileName,
});
}
/// <summary>
/// Called when the user has navigated to somewhere in the book. The chapter display
/// tries to sync itself to the value. The chapter display depends on the caller being
/// fully initialized first!
/// </summary>
/// <param name="sourceId"></param>
/// <param name="location"></param>
public async void NavigateTo(NavigateControlId sourceId, BookLocation location)
{
string chapterid = "";
var nav = Navigator.Get();
if (!double.IsNaN(location.ScrollPercent))
{
chapterid = await nav.MainBookHandler.GetChapterBeforePercentAsync(location);
}
else
{
chapterid = nav.MainBookHandler.GetChapterContainingId(location.Location, location.HtmlIndex);
}
EpubChapterData foundChapter = null;
if (foundChapter == null && location.HtmlIndex >= 0)
{
var html = Book.ResourcesHtmlOrdered[location.HtmlIndex];
foreach (var chapter in Chapters)
{
// FAIL: Intro to Planetary Nebulae the location is html 8, id tit1 which is shared by multiple chapters.
if (html.Href.EndsWith(chapter.FileName) && chapter.Anchor == chapterid)
{
foundChapter = chapter;
break;
}
}
}
// Most common: there's an id, and it matches a single chapter.
if (foundChapter == null)
{
foreach (var chapter in Chapters)
{
if (chapter.Anchor == chapterid || chapter.FileName == chapterid)
{
foundChapter = chapter;
break;
}
}
}
if (foundChapter == null && location.HtmlIndex >= 0)
{
var html = Book.ResourcesHtmlOrdered[location.HtmlIndex];
foreach (var chapter in Chapters)
{
// FAIL: Intro to Planetary Nebulae the location is html 8, id tit1 which is shared by multiple chapters.
if (html.Href.EndsWith(chapter.FileName))
{
foundChapter = chapter;
break;
}
}
}
// Worse case scenario, but it's better to display something
if (foundChapter == null)
{
foreach (var chapter in Chapters)
{
if (string.IsNullOrEmpty(chapterid))
{
App.Error($"ChapterDisplay:Navigate({location}) was asked to find an empty chapter");
foundChapter = chapter;
break;
}
}
}
if (foundChapter == null)
{
// Truly desperate.
if (Chapters.Count > 0)
{
App.Error($"ChapterDisplay:Navigate({location}) completely failed");
foundChapter = Chapters[0];
}
else
{
App.Error($"ChapterDisplay:Navigate({location}) last ditch completely failed -- no chapters at all!");
}
}
if (foundChapter != null)
{
// Select this one
uiChapterList.SelectedItem = foundChapter;
uiChapterList.ScrollIntoView(foundChapter);
return; // all done!
}
}