private async void TreeView_Expanding(winui.TreeView sender, winui.TreeViewExpandingEventArgs args)
{
if (!args.Node.HasUnrealizedChildren)
{
return;
}
sender.IsEnabled = false;
try
{
if (args.Item is ViewModels.FileItemViewModel vm)
{
if (vm.Children is null)
{
await vm.UpdateChildren();
}
args.Node.Children.Clear();
foreach (var item in vm.Folders)
{
args.Node.Children.Add(new winui.TreeViewNode()
{
IsExpanded = false,
Content = item,
HasUnrealizedChildren = item.IsFolder,
});
}
}
}
finally
{
args.Node.HasUnrealizedChildren = false;
sender.IsEnabled = true;
}
}
private async void Tree_Expanding(MUXC.TreeView sender, MUXC.TreeViewExpandingEventArgs args)
{
if (args.Item is ListWrapper listWrapper && listWrapper.HasUnrealizedChildren)
{
listWrapper.TokenSource = new CancellationTokenSource();
listWrapper.Expanded = true;
await FillItem(listWrapper);
}
}
private async void Tree_Expanding(MUXC.TreeView sender, MUXC.TreeViewExpandingEventArgs args)
{
if (args.Node.HasUnrealizedChildren)
{
if (args.Node is CancellableTreeViewNode ctvn)
{
ctvn.TokenSource = new CancellationTokenSource();
ctvn.IsExpanded = true;
}
await FillNode(args.Node);
}
}
private void OnNodeExpanding(TreeViewNode sender, object args)
{
var treeViewExpandingEventArgs = new TreeViewExpandingEventArgs(sender);
if (ListControl != null)
{
if (ContainerFromNode(sender) is TreeViewItem expandingTvi)
{
if (!expandingTvi.IsExpanded)
{
expandingTvi.IsExpanded = true;
}
//Update TemplateSettings properties
var templateSettings = expandingTvi.TreeViewItemTemplateSettings;
templateSettings.ExpandedGlyphVisibility = Visibility.Visible;
templateSettings.CollapsedGlyphVisibility = Visibility.Collapsed;
}
Expanding?.Invoke(this, treeViewExpandingEventArgs);
}
}
private void UnrealizedTreeViewSelection_Expanding(Microsoft.UI.Xaml.Controls.TreeView sender, Microsoft.UI.Xaml.Controls.TreeViewExpandingEventArgs args)
{
VirtualizingDataSource.FillTreeNode(args.Node);
}
private async void TreeView_Expanding(Microsoft.UI.Xaml.Controls.TreeView sender, Microsoft.UI.Xaml.Controls.TreeViewExpandingEventArgs args)
{
if (!args.Node.HasUnrealizedChildren)
{
return;
}
sender.IsEnabled = false;
try
{
if (args.Item is ViewModels.IBookmarkItem vm)
{
var container = sender.ContainerFromItem(args.Item);
if (!vm.IsFolder)
{
return;
}
var child = (await vm.GetChilderenAsync())?.Where(a => a.IsFolder && !a.IsReadOnly);
if (child is null)
{
return;
}
if (container is Microsoft.UI.Xaml.Controls.TreeViewItem tvi)
{
tvi.ItemsSource = child;
}
}
}
finally
{
args.Node.HasUnrealizedChildren = false;
sender.IsEnabled = true;
}
}
