/// <summary>
/// Update the scroll viewer of the thumbnail panel
/// </summary>
private void UpdateScrollViewer(bool isScrollDown, double thumbnailHeight)
{
if (isScrollDown)
{
if (ThumbNailScrollViewer.ViewportHeight < (_currentIndex * (thumbnailHeight + DefaultMargin20) + ViewPortRoundingConstant))
{
var total = (_currentIndex * (thumbnailHeight + DefaultMargin20) + ViewPortRoundingConstant);
ThumbNailScrollViewer.ChangeView(null, total, 1.0F, false);
}
}
else
{
if (ThumbNailScrollViewer.ViewportHeight > 0)
{
var total = (_currentIndex * (thumbnailHeight + DefaultMargin20)) - (thumbnailHeight + DefaultMargin20);
ThumbNailScrollViewer.ChangeView(null, total, 1.0F, false);
}
}
}
/// <summary>
/// Update the layout for thumbnail and main views for mobile environment
/// </summary>
/// <param name="presentation">The presentation to be viewed</param>
/// <returns></returns>
private async Task UpdateMobileLayout(IPresentation presentation)
{
borderHeader.Visibility = Visibility.Visible;
loadingRing.Visibility = Visibility.Visible;
loadingRing.IsActive = true;
ThumbNailScrollViewer.Visibility = Visibility.Collapsed;
LoadingStatusCanvas.Visibility = Visibility.Visible;
ThumbNailScrollViewer.ChangeView(null, 1, null);
int renderedSlides = 0;
for (int i = 0; i < _presentation.Slides.Count; i++)
{
ISlide slide = _presentation.Slides[i];
await ConvertSlide(slide);
renderedSlides++;
if (renderedSlides == 4 || slide.SlideNumber == _slideCount)
{
for (int j = slide.SlideNumber - (renderedSlides - 1); j <= slide.SlideNumber; j++)
{
await AddMobileThumbnailView(j);
}
renderedSlides = 0;
loadingRing.Visibility = Visibility.Collapsed;
}
if ((_slideCount >= 4 && slide.SlideNumber == 4) || _slideCount < 4)
{
loadingRing.Visibility = Visibility.Collapsed;
loadingRing.IsActive = false;
ThumbNailScrollViewer.Visibility = Visibility.Visible;
//LoadingStatusCanvas.Visibility = Visibility.Visible;
}
}
LoadingStatusCanvas.Visibility = Visibility.Collapsed;
}
/// <summary>
/// Convert the slides to images and update the layout
/// </summary>
private async Task Render()
{
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.Desktop;
openPicker.FileTypeFilter.Add(".pptx");
StorageFile file = await openPicker.PickSingleFileAsync();
if (file == null)
{
if (!_isWindowsPhone)
{
TempThumbNailScrollViewer.Visibility = Visibility.Collapsed;
ThumbNailScrollViewer.Visibility = Visibility.Visible;
MainViewImageGrid.Visibility = Visibility.Visible;
loadingRing.IsActive = false;
loadingRing.Visibility = Visibility.Collapsed;
}
return;
}
if (!_isWindowsPhone)
{
CancelRunningTask();
_currentIndex = -1;
ThumbNailScrollViewer.ChangeView(null, 1, null);
}
if (_isWindowsPhone)
{
ThumbNailScrollViewer.Visibility = Visibility.Collapsed;
ThumbNailScrollViewer.ChangeView(null, 1, null);
loadingRing.Visibility = Visibility.Visible;
loadingRing.IsActive = true;
}
Dispose();
_isTaskRunning = true;
//Open the presentation stream and retrieve it in the presentation instance.
Stream pptxStream = file.OpenStreamForReadAsync().Result;
TitleTextBlock.Text = file.Name;
LoadPresentation(pptxStream);
if (!_isWindowsPhone)
{
foreach (ISlide slide in _presentation.Slides)
{
if (_cancellationToken.IsCancellationRequested)
{
return;
}
string filePath = await ConvertSlide(slide);
RowDefinition row = new RowDefinition();
ThumbnailGrid.RowDefinitions.Add(row);
if (_cancellationToken.IsCancellationRequested)
{
return;
}
if (_presentation.Slides[0].SlideNumber == 0)
{
UpdateThumbnailGrid(filePath, slide.SlideNumber + 1, _cancellationToken);
}
else
{
UpdateThumbnailGrid(filePath, slide.SlideNumber, _cancellationToken);
}
if ((_presentation.Slides.Count >= 5 && slide.SlideNumber == 5) || _presentation.Slides.Count < 5)
{
TempThumbNailScrollViewer.Visibility = Visibility.Collapsed;
ThumbNailScrollViewer.Visibility = Visibility.Visible;
MainViewImageGrid.Visibility = Visibility.Visible;
loadingRing.IsActive = false;
loadingRing.Visibility = Visibility.Collapsed;
}
}
}
else if (_isWindowsPhone)
{
if (_cancellationToken.IsCancellationRequested)
{
return;
}
LoadingStatusCanvas.Visibility = Visibility.Collapsed;
int renderedSlides = 0;
for (int i = 0; i < _slideCount; i++)
{
ISlide slide = _presentation.Slides[i];
if (_cancellationToken.IsCancellationRequested)
{
return;
}
await ConvertSlide(slide);
renderedSlides++;
if (renderedSlides == 4 || slide.SlideNumber == _slideCount)
{
for (int j = slide.SlideNumber - (renderedSlides - 1); j <= slide.SlideNumber; j++)
{
await AddMobileThumbnailView(j);
}
renderedSlides = 0;
}
if ((_slideCount >= 4 && slide.SlideNumber == 4) || _slideCount < 4)
{
loadingRing.Visibility = Visibility.Collapsed;
loadingRing.IsActive = false;
ThumbNailScrollViewer.Visibility = Visibility.Visible;
LoadingStatusCanvas.Visibility = Visibility.Visible;
}
}
LoadingStatusCanvas.Visibility = Visibility.Collapsed;
}
pptxStream.Dispose();
_isTaskRunning = false;
}