private void ImageList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (ImageList.SelectedItem != null)
{
ListViewItem item = (ListViewItem)ImageList.ContainerFromItem(ImageList.SelectedItem);
Uri imageSource = _imageUriGetterFunc(item.Content, true);
if (_crossFadeBatch == null)
{
// Save the previous image for a cross-fade
_previousSurfaceBrush.Surface = BackgroundImage.SurfaceBrush.Surface;
_previousSurfaceBrush.CenterPoint = BackgroundImage.SurfaceBrush.CenterPoint;
_previousSurfaceBrush.Stretch = BackgroundImage.SurfaceBrush.Stretch;
// Load the new background image
BackgroundImage.ImageOpened += BackgroundImage_ImageChanged;
}
// Update the images
BackgroundImage.Source = imageSource;
PrimaryImage.Source = imageSource;
if (!_transition.Completed)
{
_transition.Cancel();
}
// Kick off a connected animation to animate from it's current position to it's new location
CompositionImage image = VisualTreeHelperExtensions.GetFirstDescendantOfType <CompositionImage>(item);
_transition.Initialize(this, image, null);
_transition.Start(this, PrimaryImage, null, null);
}
}
private void OnViewModelPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == nameof(ViewModel.IsRunning))
{
ShowStatusMessage();
}
else if (e.PropertyName == nameof(ViewModel.IsStatusLoading))
{
if (ViewModel.IsStatusLoading)
{
ShowInfo("Loading status...");
}
else
{
ShowStatusMessage();
}
}
else if (e.PropertyName == nameof(ViewModel.IsDownloading))
{
if (ViewModel.IsDownloading)
{
ShowInfo("Downloading image...");
}
}
else if (e.PropertyName == nameof(ViewModel.SelectedImage))
{
if (ViewModel.SelectedImage != null)
{
FlipViewItem item = (FlipViewItem)ImageList.ContainerFromItem(ViewModel.SelectedImage);
ScrollViewer itemView = (ScrollViewer)item.ContentTemplateRoot;
zoom.Apply(itemView, ViewModel.SelectedImage);
}
}
}
/// <summary>
/// 使用动画效果更改当前显示的图片
/// </summary>
/// <param name="e">需要显示的图片</param>
private void ChangeDisplayImage(PhotoDisplaySupport e)
{
FileName.Text = e.FileName;
DisplayFile = e.PhotoFile;
DisplayImage.Opacity = 0;
Image image = ((ImageList.ContainerFromItem(e) as ListViewItem).ContentTemplateRoot as FrameworkElement).FindName("Photo") as Image;
ConnectedAnimationService.GetForCurrentView().PrepareToAnimate("PhotoAnimation", image).Configuration = new BasicConnectedAnimationConfiguration();
ConnectedAnimationService.GetForCurrentView().DefaultDuration = TimeSpan.FromMilliseconds(600);
FadeOut.Begin();
SelectedPhotoID = e.PhotoFile.FolderRelativeId;
}
private void ImageList_ItemClick(object sender, ItemClickEventArgs e)
{
ListViewItem item = (ListViewItem)ImageList.ContainerFromItem(e.ClickedItem);
// If we near the edges of the list, scroll more into view
GeneralTransform coordinate = item.TransformToVisual(ImageList);
Point position = coordinate.TransformPoint(new Point(0, 0));
if ((position.X + item.ActualWidth >= ImageList.ActualWidth) ||
(position.X - item.ActualWidth <= 0))
{
double delta = position.X - item.ActualWidth <= 0 ? -item.ActualWidth : item.ActualWidth;
delta *= 1.5;
ScrollViewer scroller = ImageList.GetFirstDescendantOfType <ScrollViewer>();
scroller.ChangeView(scroller.HorizontalOffset + delta, null, null);
}
}
