/// <summary>
/// Create the VM. We generate a first page hero slide.
/// </summary>
/// <param name="file">The PDF File to generate. If null, we will make this VM as invalid</param>
public FirstSlideHeroViewModel(PDFFile file, Lazy <FullTalkAsStripViewModel> fullVM)
{
// If we are actually connected to a file, then
// - setup the hero slide
// - a button to show all slides
_heroPageUC = null;
HaveHeroSlide = false;
if (file != null)
{
// Hero slide. Tricky because we can't display until
// a fetch has been done on the PDF data.
var pdf = new PDFPageViewModel(file.GetPageStreamAndCacheInfo(0));
_heroPageUC = pdf.LoadSize()
.Select(_ => pdf)
.ToProperty(this, m => m.HeroPageUC, scheduler: RxApp.MainThreadScheduler);
HaveHeroSlide = true;
// Allow a full view
OpenFullView = ReactiveCommand.Create();
OpenFullView
.Subscribe(_ => fullVM.Value.LoadPage(0));
}
}
/// <summary>
/// Create n pages, as requested, and prepare them for the UI.
/// </summary>
/// <param name="n"></param>
/// <param name="file"></param>
/// <returns></returns>
private async Task <PDFPageViewModel[]> CreateNPages(int n, int start_index, PDFFile file)
{
if (n <= 0)
{
return(new PDFPageViewModel[0]);
}
// Create and initialize pages
var newPages = Enumerable.Range(start_index, n).Select(i => new PDFPageViewModel(file.GetPageStreamAndCacheInfo(i))).ToArray();
var sequenceOfPages = newPages.Select(p => p.LoadSize());
foreach (var seq in sequenceOfPages)
{
var r = await seq.ToArray();
}
return(newPages);
}
/// <summary>
/// Create the new slides and load them up.
/// </summary>
/// <param name="n"></param>
/// <param name="pdfFile"></param>
/// <param name="fullVM"></param>
/// <returns></returns>
private async Task <SlideThumbViewModel[]> CreateNewThumbs(int n, PDFFile pdfFile, Lazy <FullTalkAsStripViewModel> fullVM)
{
var newSlides = Enumerable.Range(SlideThumbnails.Count, n - SlideThumbnails.Count).Select(i => new SlideThumbViewModel(pdfFile.GetPageStreamAndCacheInfo(i), fullVM, i)).ToArray();
foreach (var sld in newSlides)
{
await sld.LoadSize();
}
return(newSlides);
}