public static void AnimateBackItemToList(ListViewBase list, object lastSelectedItem, ConnectedAnimation connectedAnimation)
{
list.ScrollIntoView(lastSelectedItem);
if (list.GetType() == typeof(ListView))
{
var item = (ListViewItem)list.ContainerFromItem(lastSelectedItem);
if (item == null)
{
connectedAnimation.Cancel(); return;
}
var pane = (FrameworkElement)item.ContentTemplateRoot;
var image = (Image)pane.FindName("PhotoImage");
if (image == null)
{
connectedAnimation.Cancel(); return;
}
image.Opacity = 0;
image.Loaded += (_s, _e) => {
image.Opacity = 1;
connectedAnimation.TryStart(image);
};
}
else if (list.GetType() == typeof(AdaptiveGridView) || list.GetType() == typeof(GridView))
{
var item = (GridViewItem)list.ContainerFromItem(lastSelectedItem);
if (item == null)
{
connectedAnimation.Cancel(); return;
}
var pane = (FrameworkElement)item.ContentTemplateRoot;
var image = (Image)pane.FindName("PhotoImage");
if (image == null)
{
connectedAnimation.Cancel(); return;
}
image.Opacity = 0;
image.Loaded += (_s, _e) => {
image.Opacity = 1;
connectedAnimation.TryStart(image);
};
}
}
private void OnLoaded(AdaptiveGridView adaptiveGrid)
{
IsMultiselectionEnable = false;
if (adaptiveGrid == null || LastSelectedItem == null)
{
return;
}
var selectedItem = Items.FirstOrDefault(item => item.Item.Id == LastSelectedItem.Item.Id);
if (selectedItem == null)
{
return;
}
ConnectedAnimation animation = ConnectedAnimationService.GetForCurrentView().GetAnimation(Constants.ConnectedAnimationKey);
if (animation != null)
{
adaptiveGrid.ScrollIntoView(selectedItem, ScrollIntoViewAlignment.Default);
adaptiveGrid.UpdateLayout();
var containerObject = adaptiveGrid.ContainerFromItem(selectedItem);
if (containerObject is GridViewItem container)
{
var root = (FrameworkElement)container.ContentTemplateRoot;
var image = (Image)root.FindName("SourceImage");
animation.TryStart(image);
}
else
{
animation.Cancel();
}
}
LastSelectedItem = null;
}
private static void ExecutePreparedTransition(ITransitionMapper tm, Page pageFrom, Page pageTo, bool isPop)
{
var cas = ConnectedAnimationService.GetForCurrentView();
var transFrom = (IReadOnlyList <TransitionDetail>)pageFrom?.GetValue(SharedTransitionNavigationPage.TransitionFromMapProperty);
pageFrom?.SetValue(SharedTransitionNavigationPage.TransitionFromMapProperty, null);
// group is used when popping back to a page with the group defined
var group = (string)pageTo?.GetValue(SharedTransitionNavigationPage.TransitionSelectedGroupProperty);
var transTo = tm.GetMap(pageTo, group, !isPop);
foreach (var detail in transTo)
{
ConnectedAnimation animation = cas.GetAnimation(detail.TransitionName);
if (animation != null)
{
if (detail.NativeView.IsAlive)
{
if (detail.View.Height == -1)
{
// need to capture the value and then use that in the event handler since it changes with each time through the loop
var acapture = animation;
detail.View.SizeChanged += (s, e) =>
{
// save this so we only call TryStart on the first time through
var atemp = acapture;
acapture = null;
if (atemp != null && detail.NativeView.IsAlive)
{
atemp.TryStart((UIElement)detail.NativeView.Target);
}
};
}
else
{
var b = animation.TryStart((UIElement)detail.NativeView.Target);
}
}
}
}
foreach (var transChk in transFrom ?? Enumerable.Empty <TransitionDetail>())
{
if (!transTo.Any(t => t.TransitionName == transChk.TransitionName))
{
// transFrom item not in transTo
ConnectedAnimation animation = cas.GetAnimation(transChk.TransitionName);
if (animation != null)
{
animation.Cancel();
}
if (isPop)
{
// TODO: figure out why this is needed
transChk.View.IsVisible = false;
if (transChk.NativeView.IsAlive)
{
((UIElement)transChk.NativeView.Target).Visibility = Visibility.Collapsed;
}
}
}
}
}