/// <summary>
/// Add an imported page to our output
/// @throws IOException, BadPdfFormatException
/// </summary>
/// <param name="iPage">an imported page</param>
public void AddPage(PdfImportedPage iPage)
{
var pageNum = SetFromIPage(iPage);
var thePage = Reader.GetPageN(pageNum);
var origRef = Reader.GetPageOrigRef(pageNum);
Reader.ReleasePage(pageNum);
var key = new RefKey(origRef);
PdfIndirectReference pageRef;
var iRef = (IndirectReferences)Indirects[key];
if (iRef != null && !iRef.Copied)
{
PageReferences.Add(iRef.Ref);
iRef.SetCopied();
}
pageRef = CurrentPage;
if (iRef == null)
{
iRef = new IndirectReferences(pageRef);
Indirects[key] = iRef;
}
iRef.SetCopied();
var newPage = CopyDictionary(thePage);
Root.AddPage(newPage);
++currentPageNumber;
}
protected void OnPopToNewRoot(IPageViewModel viewModel, bool animated)
{
var pref = createPageFor(viewModel);
PageReferences.Clear();
PageReferences.Add(pref);
popToNewRootAsync(pref.View, animated);
}
protected virtual void OnPushViewModel(IPageViewModel viewModel, bool animated)
{
if (PageReferences.Any(p => p.Model == viewModel))
{
throw new Exception(String.Format("The navigation stack already contains the viewModel: {0}", viewModel));
}
var pref = createPageFor(viewModel);
PageReferences.Add(pref);
PushAsync(pref.View, animated);
}
async void updatePages()
{
if (_pages != null && _pages.Count > 0)
{
foreach (var pref in PageReferences.Where(p => !_pages.Contains(p.Model)).ToList())
{
PageReferences.Remove(pref);
}
if (new[] { this.Navigation.NavigationStack.FirstOrDefault(), this.Navigation.NavigationStack.LastOrDefault(), PageReferences.LastOrDefault()?.View }
.All(v => v == PageReferences.FirstOrDefault()?.View))
{
OnPopToRoot(Pages.LastOrDefault(), TransitionAnimationEnabled);
}
else
{
if (Navigation.NavigationStack.Count > 0)
{
var pref = createPageFor(Pages.LastOrDefault());
PageReferences.Clear();
PageReferences.Add(pref);
await popToNewRootAsync(pref.View, TransitionAnimationEnabled);
}
else
{
OnPushViewModel(Pages.LastOrDefault(), TransitionAnimationEnabled);
}
}
}
else
{
//At least on page should be displayed
PageReferences.Clear();
var blankPage = new ContentPage {
BackgroundColor = Color.Transparent
};
if (Navigation.NavigationStack.Count > 0)
{
await popToNewRootAsync(blankPage, TransitionAnimationEnabled);
}
else
{
await PushAsync(blankPage, TransitionAnimationEnabled);
}
}
}