private void ThumbnailList_Click(object sender, ItemClickEventArgs e)
{
GridView gridView = (GridView)sender;
GridViewItem item = (GridViewItem)gridView.ContainerFromItem(e.ClickedItem);
CompositionImage image = VisualTreeHelperExtensions.GetFirstDescendantOfType <CompositionImage>(item);
// We are about to transition to a new page. Cancel any outstanding transitions.
if (_currentTransition != null)
{
if (!_currentTransition.Completed)
{
_currentTransition.Cancel();
}
_currentTransition = null;
}
DetailsInfo info;
info.thumbanil = (Thumbnail)e.ClickedItem;
// Setup the new transition and trigger the navigation
ContinuityTransition transition = new ContinuityTransition();
transition.Initialize(_host, image, info);
_host.ContentFrame.Navigate(typeof(ContinuityDetails), transition);
}
private void ContinuityDetails_BackRequested(object sender, BackRequestedEventArgs e)
{
if (!e.Handled)
{
// Unregister the handler
SystemNavigationManager.GetForCurrentView().BackRequested -= ContinuityDetails_BackRequested;
// We are about to transition to a new page. Cancel any outstanding transitions.
if (_currentTransition != null)
{
if (!_currentTransition.Completed)
{
_currentTransition.Cancel();
}
_currentTransition = null;
}
// Setup the new transition and trigger the navigation
ContinuityTransition transition = new ContinuityTransition();
transition.Initialize(_host, ThumbnailImage, _detailsInfo);
_host.ContentFrame.Navigate(typeof(Continuity), transition);
// We've got it handled
e.Handled = true;
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
// Store the incoming parameter
if (e.Parameter is SampleHost)
{
_host = (SampleHost)e.Parameter;
}
else if (e.Parameter is ContinuityTransition)
{
_currentTransition = (ContinuityTransition)e.Parameter;
}
//Hide the back button on the list page as there is no where to go back to.
Windows.UI.Core.SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = Windows.UI.Core.AppViewBackButtonVisibility.Collapsed;
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
_currentTransition = (ContinuityTransition)e.Parameter;
_detailsInfo = (Continuity.DetailsInfo)_currentTransition.Payload;
_host = (SampleHost)_currentTransition.Host;
Title.Text = _detailsInfo.thumbanil.Name;
DetailText.Text = _detailsInfo.thumbanil.Description;
// Enable the back button
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = _host.ContentFrame.CanGoBack ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
SystemNavigationManager.GetForCurrentView().BackRequested += ContinuityDetails_BackRequested;
}
/// <summary>
/// Private constructor as Show() is responsible for creating an instance
/// </summary>
private ImagePopupViewer(Func <object, bool, Uri> photoGetter, string initialPhoto)
{
this.InitializeComponent();
_imageUriGetterFunc = photoGetter;
_transition = new ContinuityTransition();
_compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
this.Loaded += ImagePopupViewer_Loaded;
this.Unloaded += ImagePopupViewer_Unloaded;
// Bring the selected item into view
_initialPhoto = initialPhoto;
// Hide until the content is available
this.Opacity = 0;
BackgroundImage.ImageOpened += BackgroundImage_FirstOpened;
// Disable the placeholder as we'll be using a transition
PrimaryImage.PlaceholderDelay = TimeSpan.FromMilliseconds(-1);
BackgroundImage.PlaceholderDelay = TimeSpan.FromMilliseconds(-1);
BackgroundImage.LoadTimeEffectHandler = SampleImageColor;
BackgroundImage.SharedSurface = true;
// Create a crossfade brush to animate image transitions
IGraphicsEffect graphicsEffect = new ArithmeticCompositeEffect()
{
Name = "CrossFade",
Source1Amount = 0,
Source2Amount = 1,
MultiplyAmount = 0,
Source1 = new CompositionEffectSourceParameter("ImageSource"),
Source2 = new CompositionEffectSourceParameter("ImageSource2"),
};
CompositionEffectFactory factory = _compositor.CreateEffectFactory(graphicsEffect, new[] { "CrossFade.Source1Amount", "CrossFade.Source2Amount" });
_crossFadeBrush = factory.CreateBrush();
}
