/// <summary>
/// Returns service objects associated with this control.
/// This method should be called by IServiceProvider.GetService implementation
/// for DocumentPageView or subclasses.
/// </summary>
/// <param name="serviceType">Specifies the type of service object to get.</param>
protected object GetService(Type serviceType)
{
object service = null;
if (serviceType == null)
{
throw new ArgumentNullException("serviceType");
}
CheckDisposed();
// No service is available if the Content does not provide
// any services.
if (_documentPaginator != null && _documentPaginator is IServiceProvider)
{
// Following services are available:
// (1) TextView - wrapper for TextView exposed by the current page.
// (2) TextContainer - the service object is retrieved from DocumentPaginator.
if (serviceType == typeof(ITextView))
{
if (_textView == null)
{
ITextContainer tc = ((IServiceProvider)_documentPaginator).GetService(typeof(ITextContainer)) as ITextContainer;
if (tc != null)
{
_textView = new DocumentPageTextView(this, tc);
}
}
service = _textView;
}
else if (serviceType == typeof(TextContainer) || serviceType == typeof(ITextContainer))
{
service = ((IServiceProvider)_documentPaginator).GetService(serviceType);
}
}
return service;
}
/// <summary>
/// Dispose the object.
/// </summary>
protected void Dispose()
{
if (!_disposed)
{
_disposed = true;
// Cleanup all state associated with Paginator.
if (_documentPaginator != null)
{
_documentPaginator.GetPageCompleted -= new GetPageCompletedEventHandler(HandleGetPageCompleted);
_documentPaginator.PagesChanged -= new PagesChangedEventHandler(HandlePagesChanged);
_documentPaginator.CancelAsync(this);
DisposeCurrentPage();
DisposeAsyncPage();
}
Invariant.Assert(_documentPage == null);
Invariant.Assert(_documentPageAsync == null);
_documentPaginator = null;
_textView = null;
}
}