public void ScrollToBottom()
{
if (ScrollingHost != null)
{
ScrollingHost.ChangeView(null, ScrollingHost.ScrollableHeight, null);
}
}
private void SharedMedia_ViewChanged(object sender, ScrollViewerViewChangedEventArgs args)
{
var scrollViewer2 = SharedMedia.GetScrollViewer();
if (_sharedMediaDisabled)
{
if (!args.IsIntermediate)
{
scrollViewer2.ChangeView(null, 12, null, false);
}
_sharedMedia = scrollViewer2.VerticalOffset;
return;
}
if (scrollViewer2.VerticalOffset <= 12 && _sharedMedia > scrollViewer2.VerticalOffset)
{
ScrollingHost.VerticalScrollMode = ScrollMode.Auto;
ScrollingHost.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
ScrollingHost.ChangeView(null, ScrollingHost.ScrollableHeight - 48, null, false);
_scrollingHostDisabled = false;
_sharedMediaDisabled = true;
SharedMedia.SetScrollMode(false);
}
_sharedMedia = scrollViewer2.VerticalOffset;
}
private void ScrollingHost_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
// We want to update containers when the view has been scrolled to the start/end or when the change has ended
if (ScrollingHost.HorizontalOffset == 0 || ScrollingHost.HorizontalOffset == ScrollingHost.ScrollableWidth || (_needFinal && !e.IsIntermediate))
{
_needFinal = false;
var viewModel = ViewModel;
if (viewModel == null)
{
// Page is most likey being closed, just reset the view
LayoutRoot_HorizontalSnapPointsChanged(LayoutRoot, null);
return;
}
var selected = viewModel.SelectedIndex;
var previous = selected > 0;
var next = selected < viewModel.Items.Count - 1;
#if GALLERY_EXPERIMENTAL
var difference = previous ? 0 : LayoutRoot.SnapPointWidth;
#else
var difference = 0;
#endif
var index = Math.Round((difference + ScrollingHost.HorizontalOffset) / LayoutRoot.SnapPointWidth);
if (index == 0 && previous)
{
viewModel.SelectedItem = viewModel.Items[selected - 1];
PrepareNext(-1);
Dispose();
}
else if (index == 2 && next)
{
viewModel.SelectedItem = viewModel.Items[selected + 1];
PrepareNext(+1);
Dispose();
}
viewModel.LoadMore();
#if GALLERY_EXPERIMENTAL
if (ViewModel.SelectedIndex == 0 || !previous)
{
//ScrollingHost.ChangeView(index == 2 ? LayoutRoot.SnapPointWidth : 0, null, null, true);
ScrollingHost.ChangeView(0, null, null, true);
}
else
#endif
{
ScrollingHost.HorizontalSnapPointsType = SnapPointsType.None;
ScrollingHost.ChangeView(LayoutRoot.SnapPointWidth, null, null, true);
ScrollingHost.HorizontalSnapPointsType = SnapPointsType.MandatorySingle;
}
}
else
{
_needFinal = true;
}
}
public void UpdateItem(IGalleryDelegate delegato, GalleryContent item)
{
_delegate = delegato;
_item = item;
Tag = item;
Panel.Background = null;
Texture.Source = null;
ScrollingHost.ChangeView(0, 0, 1, true);
if (item == null)
{
return;
}
var data = item.GetFile();
var thumb = item.GetThumbnail();
Panel.Constraint = item.Constraint;
Panel.InvalidateMeasure();
if (thumb != null && (item.IsVideo || (item.IsPhoto && !data.Local.IsDownloadingCompleted)))
{
UpdateThumbnail(item, thumb);
}
UpdateFile(item, data);
}
public void UpdateItem(IGalleryDelegate delegato, GalleryContent item)
{
_delegate = delegato;
_item = item;
Tag = item;
Panel.Background = null;
Texture.Source = null;
ScrollingHost.ChangeView(0, 0, 1, true);
if (item == null)
{
return;
}
var file = item.GetFile();
var thumbnail = item.GetThumbnail();
Panel.Constraint = item.Constraint;
Panel.InvalidateMeasure();
UpdateManager.Subscribe(this, delegato.ProtoService, file, ref _fileToken, UpdateFile);
UpdateFile(item, file);
if (thumbnail != null && (item.IsVideo || (item.IsPhoto && !file.Local.IsFileExisting())))
{
UpdateThumbnail(item, thumbnail, true);
}
}
public void Zoom(bool zoomIn)
{
var factor = ScrollingHost.ZoomFactor + (zoomIn ? 0.25f : -0.25f);
if (factor <= ScrollingHost.MaxZoomFactor)
{
var horizontal = Panel.ActualWidth * factor - ScrollingHost.ActualWidth;
var vertical = Panel.ActualHeight * factor - ScrollingHost.ActualHeight;
if (ScrollingHost.ScrollableWidth > 0)
{
horizontal *= ScrollingHost.HorizontalOffset / ScrollingHost.ScrollableWidth;
}
else
{
horizontal /= 2;
}
if (ScrollingHost.ScrollableHeight > 0)
{
vertical *= ScrollingHost.VerticalOffset / ScrollingHost.ScrollableHeight;
}
else
{
vertical /= 2;
}
ScrollingHost.ChangeView(horizontal, vertical, factor);
}
}
private void ScrollingHost_PointerMoved(object sender, PointerRoutedEventArgs e)
{
if (_pointerPressed)
{
var point = e.GetCurrentPoint(ScrollingHost);
var diffX = _pointerPosition.X - point.Position.X;
var diffY = _pointerPosition.Y - point.Position.Y;
ScrollingHost.ChangeView(diffX, diffY, null, true);
}
}
private async void PanelDoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
{
var position = e.GetPosition(Panel);
if (ScrollingHost.ZoomFactor != 1)
{
ScrollingHost.ChangeView(null, null, 1, true);
}
else if (ScrollingHost.ZoomFactor == 1)
{
var dispatcher = Window.Current.CoreWindow.Dispatcher;
await dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
{
ScrollingHost.ChangeView(position.X, position.Y, 4, true);
});
}
}
public void OnBackRequested(HandledRoutedEventArgs args)
{
if (_scrollingHostDisabled)
{
_scrollingHostDisabled = false;
SharedMedia.SetScrollMode(false);
//SetScrollMode(true);
ScrollingHost.VerticalScrollMode = ScrollMode.Auto;
ScrollingHost.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
ScrollingHost.ChangeView(null, 0, null, false);
ScrollingInfo.Visibility = Visibility.Visible;
InfoPanel.Visibility = Visibility.Collapsed;
args.Handled = true;
}
}
private void SetScrollMode(bool enable)
{
if (enable)
{
ScrollingHost.VerticalScrollMode = ScrollMode.Auto;
ScrollingHost.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
ScrollingHost.ChangeView(null, ScrollingHost.ScrollableHeight - 48, null, false);
ScrollingInfo.Visibility = Visibility.Visible;
InfoPanel.Visibility = Visibility.Collapsed;
}
else
{
ScrollingHost.ChangeView(null, ScrollingHost.ScrollableHeight, null, true);
ScrollingHost.VerticalScrollMode = ScrollMode.Disabled;
ScrollingHost.VerticalScrollBarVisibility = ScrollBarVisibility.Hidden;
ScrollingInfo.Visibility = Visibility.Collapsed;
InfoPanel.Visibility = Visibility.Visible;
}
}
private void TagsTextBox_SizeChanged(object sender, SizeChangedEventArgs e)
{
ScrollingHost.ChangeView(null, ScrollingHost.ScrollableHeight, null);
}
private void ChangeView(int index, bool disableAnimation)
{
ScrollingHost.ChangeView(ActualWidth * index, null, null, disableAnimation);
}
private void LayoutRoot_HorizontalSnapPointsChanged(object sender, object e)
{
ScrollingHost.HorizontalSnapPointsType = SnapPointsType.None;
ScrollingHost.ChangeView(LayoutRoot.SnapPointWidth, null, null, true);
ScrollingHost.HorizontalSnapPointsType = SnapPointsType.MandatorySingle;
}
public void Reset()
{
ScrollingHost.ChangeView(0, 0, 1, true);
}
