/// <summary>
/// Add a new task to the scheduler to be executed and after that run a
/// follow-up task.
/// </summary>
/// <param name="a">The task to be run in the scheduler</param>
/// <param name="h">The follow up handler to be executed</param>
private void RunOnSchedulerSync(Action a, AsyncTaskCompletedHandler h)
{
var task = new DelegateBasedAsyncTask(scheduler, a);
task.ThenPost(h, SynchronizationContext.Current);
scheduler.ScheduleForExecution(task);
}
private void ResetWatch()
{
// When the node has no input connected, the preview should be empty
// Without doing this, the preview would say "null"
if (watch.IsPartiallyApplied)
{
rootWatchViewModel.Children.Clear();
rootWatchViewModel.IsCollection = false;
return;
}
// If the node hasn't been evaluated, no need to update the UI
if (!watch.HasRunOnce)
{
return;
}
var s = dynamoViewModel.Model.Scheduler;
WatchViewModel wvm = null;
// prevent data race by running on scheduler
var t = new DelegateBasedAsyncTask(s, () =>
{
wvm = GetWatchViewModel();
});
// then update on the ui thread
t.ThenPost((_) =>
{
//If wvm is not computed successfully then don't post.
if (wvm == null)
{
return;
}
// store in temp variable to silence binding
var temp = rootWatchViewModel.Children;
rootWatchViewModel.Children = null;
temp.Clear();
temp.Add(wvm);
// rebind
rootWatchViewModel.Children = temp;
rootWatchViewModel.CountNumberOfItems();
rootWatchViewModel.CountLevels();
rootWatchViewModel.Children[0].IsTopLevel = true;
}, syncContext);
s.ScheduleForExecution(t);
}
private void UpdateColorRange()
{
var s = dynamoViewModel.Model.Scheduler;
// prevent data race by running on scheduler
var t = new DelegateBasedAsyncTask(s, () =>
{
colorRange = ComputeColorRange();
});
// then update on the ui thread
t.ThenPost((_) =>
{
var bmp = CreateColorRangeBitmap(colorRange);
gradientImage.Source = bmp;
}, syncContext);
s.ScheduleForExecution(t);
}