public void Execute(ActionExecutionContext context)
{
Exception error = null;
var worker = new BackgroundWorker();
worker.DoWork += (s, e) =>
{
try
{
_work();
}
catch (Exception ex)
{
error = ex;
}
};
worker.RunWorkerCompleted += (s, e) =>
{
if (error == null && _onSuccess != null)
{
_onSuccess.OnUIThread();
}
if (error != null && _onFail != null)
{
Caliburn.Micro.Execute.OnUIThread(() => _onFail(error));
}
Completed(this, new ResultCompletionEventArgs {
Error = error
});
};
worker.RunWorkerAsync();
}
public void ExecuteAsync()
{
Exception error = null;
_worker.DoWork += (_, __) =>
{
try
{
_work();
}
catch (Exception ex)
{
error = ex;
}
};
_worker.RunWorkerCompleted += (s, e) =>
{
if (error == null && _onSuccess != null)
{
_onSuccess?.OnUIThread();
}
if (error != null && _onFail != null)
{
Execute.OnUIThread(() => _onFail?.Invoke(error));
}
};
_worker.RunWorkerAsync();
}
public static bool TryOnUiThread(Action action) {
try {
action.OnUIThread();
return true;
} catch (AggregateException e) {
var rethrow = true;
e.Handle(x => {
if (x is OperationCanceledException)
rethrow = false;
return true;
});
if (rethrow)
throw;
return false;
}
}
public static bool TryOnUiThread(Action action)
{
try {
action.OnUIThread();
return(true);
} catch (AggregateException e) {
var rethrow = true;
e.Handle(x => {
if (x is OperationCanceledException)
{
rethrow = false;
}
return(true);
});
if (rethrow)
{
throw;
}
return(false);
}
}
/// <summary> /// Executes the given action on the UI thread /// </summary> /// <remarks>An extension point for subclasses to customise how property change notifications are handled.</remarks> /// <param name="action"></param> protected virtual void OnUIThread(System.Action action) => action.OnUIThread();
private void SyncAppBar(DependencyObject view)
{
if (view == null || _page == null)
{
return;
}
// Reset waiting flag
if (_waiting)
{
_waiting = false;
}
// Get the last visible BindableAppBar in the tree
var lastVisibleAppBar = view.GetVisualDescendants()
.OfType <BindableAppBar>()
.LastOrDefault(a => a.IsVisible);
// Show the last appbar that's visible, since having two visible
// appbars doesn't make sense in a view; but one could be visible
// and the other invisible (hot swapping!)
if (lastVisibleAppBar != null)
{
System.Action updateAppBar = () =>
{
// Refresh button state/bg color if the appbar was "hidden"
lastVisibleAppBar.Invalidate();
// Assign the bar
_page.ApplicationBar = lastVisibleAppBar.ApplicationBar;
};
// In Panorama, changing appbar visibility causes the transition to stop
// so we handle if there was no appbar previously shown
if (_page.ApplicationBar == null && _panorama != null)
{
_waiting = true;
// Animations take ~500ms
ThreadPool.QueueUserWorkItem(c =>
{
Thread.Sleep(PanoramaWaitThreshold);
// Are we still waiting on this?
if (_waiting)
{
updateAppBar.OnUIThread();
}
});
}
else
{
// Update it
updateAppBar();
}
}
else
{
// In Panorama, changing appbar visibility causes the transition to stop
if (_panorama != null)
{
// These properties are safe to change and do not cause the transition
// to abort
if (_page.ApplicationBar != null)
{
_page.ApplicationBar.Buttons.Clear();
_page.ApplicationBar.MenuItems.Clear();
_page.ApplicationBar.BackgroundColor = Color.FromArgb(1, 0, 0, 0);
}
}
else
{
_page.ApplicationBar = null;
}
}
}