private void OnChoosingItemContainer(ListViewBase sender, ChoosingItemContainerEventArgs args)
{
if (args.ItemContainer == null)
{
if (sender.ItemsPanel == VerticalStack)
{
args.ItemContainer = new ListViewItem();
}
else
{
args.ItemContainer = new GridViewItem
{
Margin = new Thickness(2)
};
}
if (sender.ItemTemplateSelector != null)
{
args.ItemContainer.ContentTemplate = sender.ItemTemplateSelector.SelectTemplate(args.Item, args.ItemContainer);
}
else
{
args.ItemContainer.ContentTemplate = sender.ItemTemplate;
}
args.ItemContainer.HorizontalContentAlignment = HorizontalAlignment.Stretch;
args.ItemContainer.VerticalContentAlignment = VerticalAlignment.Stretch;
_zoomer.ElementPrepared(args.ItemContainer);
}
args.IsContainerPrepared = true;
}
private void OnChoosingItemContainer(ListViewBase sender, ChoosingItemContainerEventArgs args)
{
var typeName = args.Item is Sticker sticker && sticker.IsAnimated ? "AnimatedItemTemplate" : "ItemTemplate";
var relevantHashSet = _typeToItemHashSetMapping[typeName];
// args.ItemContainer is used to indicate whether the ListView is proposing an
// ItemContainer (ListViewItem) to use. If args.Itemcontainer != null, then there was a
// recycled ItemContainer available to be reused.
if (args.ItemContainer != null)
{
if (args.ItemContainer.Tag.Equals(typeName))
{
// Suggestion matches what we want, so remove it from the recycle queue
relevantHashSet.Remove(args.ItemContainer);
}
else
{
// The ItemContainer's datatemplate does not match the needed
// datatemplate.
// Don't remove it from the recycle queue, since XAML will resuggest it later
args.ItemContainer = null;
}
}
// If there was no suggested container or XAML's suggestion was a miss, pick one up from the recycle queue
// or create a new one
if (args.ItemContainer == null)
{
// See if we can fetch from the correct list.
if (relevantHashSet.Count > 0)
{
// Unfortunately have to resort to LINQ here. There's no efficient way of getting an arbitrary
// item from a hashset without knowing the item. Queue isn't usable for this scenario
// because you can't remove a specific element (which is needed in the block above).
args.ItemContainer = relevantHashSet.First();
relevantHashSet.Remove(args.ItemContainer);
}
else
{
// There aren't any (recycled) ItemContainers available. So a new one
// needs to be created.
var item = new GridViewItem();
item.ContentTemplate = _typeToTemplateMapping[typeName];
item.Style = sender.ItemContainerStyle;
item.Tag = typeName;
args.ItemContainer = item;
_zoomer.ElementPrepared(args.ItemContainer);
}
}
// Indicate to XAML that we picked a container for it
args.IsContainerPrepared = true;
}
private void OnChoosingItemContainer(ListViewBase sender, ChoosingItemContainerEventArgs args)
{
if (args.ItemContainer == null)
{
args.ItemContainer = new GridViewItem();
args.ItemContainer.ContentTemplate = sender.ItemTemplate;
args.ItemContainer.Style = sender.ItemContainerStyle;
_zoomer.ElementPrepared(args.ItemContainer);
}
args.IsContainerPrepared = true;
}
private void OnChoosingItemContainer(ListViewBase sender, ChoosingItemContainerEventArgs args)
{
if (args.ItemContainer == null)
{
args.ItemContainer = new GridViewItem();
args.ItemContainer.Style = sender.ItemContainerStyle;
args.ItemContainer.ContentTemplate = sender.ItemTemplate;
args.ItemContainer.ContextRequested += Sticker_ContextRequested;
if (ApiInfo.IsFullExperience || Windows.UI.ViewManagement.UIViewSettings.GetForCurrentView().UserInteractionMode == Windows.UI.ViewManagement.UserInteractionMode.Mouse)
{
_zoomer.ElementPrepared(args.ItemContainer);
}
}
args.IsContainerPrepared = true;
}
