public void Subscribe(PageViewControlState state, Action <DjvuPage, TextLayerZone, CancellationToken> callback, CancellationToken ct)
{
lock (_tasks)
{
_tasks.Enqueue(new Obj {
State = state, Callback = callback, CancellationToken = ct
});
}
}
private void OnStateChanged(PageViewControlState oldValue, PageViewControlState newValue)
{
CleanUp();
_pageDecodingCts?.Cancel();
if (newValue != null)
{
_pageDecodingCts = new CancellationTokenSource();
PageLoadScheduler.Instance.Subscribe(newValue, PageDecodedHandler, _pageDecodingCts.Token);
}
}
private void Load()
{
if (Source == null || _containerSize == null)
{
return;
}
_pageViewObserver = new PageViewObserver();
var pageInfos = Source.GetPageInfos();
var maxPageWidth = pageInfos.Max(pageInfo => pageInfo.Width);
_pageStates = new PageViewControlState[Source.PageCount];
for (uint i = 0; i < _pageStates.Length; i++)
{
var pageInfo = pageInfos[i];
double pageWidth = pageInfo.Width;
double pageHeight = pageInfo.Height;
var scaleFactor = pageWidth / maxPageWidth;
var aspectRatio = pageWidth / pageHeight;
var width = scaleFactor * _containerSize.Value.Width;
var height = width / aspectRatio;
_pageStates[i] = new PageViewControlState(
document: Source,
pageNumber: i + 1,
width: width,
height: height,
zoomFactorObserver: _pageViewObserver);
}
PageNumber = 1;
listView.ItemsSource = _pageStates;
}
