private static void LoadIconForFile(string path, string key, Action onLoaded = null)
{
string ext = System.IO.Path.GetExtension(path).ToLowerInvariant();
// Don't re-load an icon if we're already trying to load one for that type
LoadTaskState state;
if (loadTaskCache.TryGetValue(key, out state))
{
// Add notifier
state.Notifiers.Add(onLoaded);
return;
}
// Spin off a new task to handle loading of the icon
var task = Task.Factory.StartNew(async() =>
{
var icon = await IconUtil.GetIconForPathAsync(
path,
IconUtil.IconSize.SmallIcon,
IconUtil.PathType.File,
useCache: false);
var source = Imaging.CreateBitmapSourceFromHIcon(
icon.Handle,
//System.Windows.Int32Rect.Empty,
new System.Windows.Int32Rect(0, 0, 16, 16), // TODO: This doesn't work well with DPI scaling
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
// Must freeze the DependencyObject so it can be shared across threads
source.Freeze();
// Add the icon to our filetype cache
// TODO: Do we need to lock for thread safety?
iconCache[key] = source;
// Notify users that the icon is ready
state = loadTaskCache[key];
state.Notify();
});
// Keep track of which filetypes we're currently loading
loadTaskCache[key] = new LoadTaskState(task, onLoaded);
}
public static ImageSource GetIconForFolder()
{
// TODO: Make this async also. Probably don't really need to since it'll only be called once.
if (folderIcon == null)
{
var icon = IconUtil.GetIconForPathAsync(
"C:\\folderthatdoesntexistasdasfasdfafsd",
IconUtil.IconSize.SmallIcon,
IconUtil.PathType.Directory
).Result; // Blocking
folderIcon = Imaging.CreateBitmapSourceFromHIcon(
icon.Handle,
//System.Windows.Int32Rect.Empty,
new System.Windows.Int32Rect(0, 0, 16, 16),
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
folderIcon.Freeze();
}
return(folderIcon);
}