private void SampleTreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
if (args.Node.HasUnrealizedChildren)
{
FillTreeNode(args.Node);
}
}
private async void TreeFiles_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
if (NODE_FILLING)
{
return;
}
if (args.Node.HasUnrealizedChildren)
{
NODE_FILLING = !await FillNode(args.Node);
}
}
private async void FileTree_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
if (args.Node.HasUnrealizedChildren)
{
await FillTreeNode(args.Node);
}
if ((args.Node.Content as StorageFolder).FolderRelativeId == RootFolderId)
{
if (args.Node.Children.Count == 0)
{
args.Node.Children.Add(new TreeViewNode()
{
Content = new EmptyDeviceDisplay()
});
}
}
}
private async void TreeView1_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
bool searched = !args.Node.HasUnrealizedChildren;
if (searched) // 検索済みなら何もしない
{
return;
}
sender.IsEnabled = false;
try
{
var folder = args.Node.Content as StorageFolder;
// フォルダー配下のIStorageItemオブジェクトを検索する
var items = await folder.GetItemsAsync();
// 見つかったIStorageItemオブジェクトをノードに追加する
foreach (var storageItem in items)
{
args.Node.Children.Add(new TreeViewNode()
{
IsExpanded = false,
Content = storageItem,
HasUnrealizedChildren = storageItem is StorageFolder,
});
}
}
finally
{
// 検索を実行したので、必ずHasUnrealizedChildrenはfalseにする
args.Node.HasUnrealizedChildren = false;
sender.IsEnabled = true;
}
}
private void TodoTreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
args.Node.HasUnrealizedChildren = false;
}
private void DirectoryTree_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
PopulateChildren(args.Node);
}
object ITreeViewExpandingEventArgsResolver.Item(TreeViewExpandingEventArgs e) => e.Item;
TreeViewNode ITreeViewExpandingEventArgsResolver.Node(TreeViewExpandingEventArgs e) => e.Node;
/// <summary> /// Gets the data item for the tree view node that is expanding. /// </summary> /// <param name="e">The requested <see cref="TreeViewExpandingEventArgs"/>.</param> /// <returns>The data item for the tree view node that is expanding.</returns> public static object Item(this TreeViewExpandingEventArgs e) => Resolver.Item(e);
/// <summary> /// Gets the tree view node that is expanding. /// </summary> /// <param name="e">The requested <see cref="TreeViewExpandingEventArgs"/>.</param> /// <returns>The tree view node that is expanding.</returns> public static TreeViewNode Node(this TreeViewExpandingEventArgs e) => Resolver.Node(e);
private void TreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
library.Expanding(args.Node);
}
private void TreeView_Expanding(TreeView sender, TreeViewExpandingEventArgs args)
{
(args.Item as ViewModels.FileItemViewModel)?.LoadChildren();
}
