public static void SetupDataContextChanged <T>(this FrameworkElement element, Action <T> action) where T : class
{
var context = element.DataContext;
if (context != null)
{
if (action != null)
{
action.Invoke(context as T);
}
return;
}
var cleanup = new DisposeManager();
DependencyPropertyChangedEventHandler handler = (s, e) =>
{
cleanup.Dispose();
if (action != null)
{
action.Invoke(e.NewValue as T);
}
};
cleanup.AddEvent(h => element.DataContextChanged += h, h => element.DataContextChanged -= h, handler);
}
public static Task ShutdownAsync(this Dispatcher d)
{
var tcs = new TaskCompletionSource <int>();
var cleanup = new DisposeManager();
EventHandler handler = (s, e) =>
{
cleanup.Dispose();
tcs.TrySetResult(0);
};
cleanup.AddEvent(h => d.ShutdownFinished += h, h => d.ShutdownFinished -= h, handler);
d.BeginInvokeShutdown(DispatcherPriority.Normal);
return(tcs.Task);
}
private void HandleNavigateTo(IFileSystemFolderOperations operation, TFolder selected)
{
if (_gridSelectionToken != null)
{
_gridSelectionToken.Dispose();
}
var gvm = _gridViewModel;
EventHandler handler = (s, e) => gvm.SetSelectedAsync(selected as TFile);
var token = _gridSelectionToken = new DisposeManager();
token.AddEvent(h => gvm.FilesPopulated += h, h => gvm.FilesPopulated -= h, handler);
_treeViewModel.SelectAsync(operation.DriveFolder);
}
public static void SetupLoaded(this FrameworkElement element, Action action)
{
if (element.IsLoaded)
{
action();
return;
}
var cleanup = new DisposeManager();
RoutedEventHandler handler = (s, e) =>
{
cleanup.Dispose();
action();
};
cleanup.AddEvent(h => element.Loaded += h, h => element.Loaded -= h, handler);
}
private void HandleCompletedOrCanceled(DisposeManager cleanup, Window window, ProgressViewModel viewModel, IProgressItemViewModel <T> itemViewModel, bool isCompleted)
{
cleanup.Dispose();
window.Dispatcher.CheckedInvoke(() =>
{
viewModel.ProgressItems.Remove(itemViewModel);
if (viewModel.ProgressItems.Count == 0)
{
Task.Delay(1000);
if (_window != null && _window.IsVisible)
{
viewModel.OkCommand.TryExecute(null);
}
_window = null;
var result = new AsyncActivityResult <IProgressItemViewModel <T> >(isCompleted, itemViewModel);
Completion.TrySetResult(result);
}
});
}
private async Task NavigateAsync(IFolder folder, TFolder selected)
{
_treeViewModel.PropertyChanged -= HandleTreePropertyChanged;
if (_gridSelectionToken != null)
{
_gridSelectionToken.Dispose();
}
var gvm = _gridViewModel;
EventHandler handler = (s, e) => gvm.SetSelectedAsync(selected as TFile);
var token = _gridSelectionToken = new DisposeManager();
token.AddEvent(h => gvm.FilesPopulated += h, h => gvm.FilesPopulated -= h, handler);
await _treeViewModel.SelectAsync(folder);
_treeViewModel.PropertyChanged += HandleTreePropertyChanged;
}