public IEnumerable <T> Visit(Merge <T> disjointUnion)
{
var a = InMemory.Get(disjointUnion.InputA);
var b = InMemory.Get(disjointUnion.InputB);
return(a.Concat(b));
}
public IEnumerable <T> Visit <A, B>(Product <T, A, B> product)
{
var a = InMemory.Get(product.InputA);
var b = InMemory.Get(product.InputB);
return(a.SelectMany(ai => b.SelectMany(bi => product.Func(ai, bi))));
}
public IEnumerable <T> Visit <I>(GroupBy <T, I> groupBy)
=> InMemory
.Get(groupBy.Input)
.GroupBy(
v => v.Item1,
v => v.Item2,
(key, list) => (key, list.Aggregate(groupBy.Reduce)))
.SelectMany(groupBy.GetResult);
private void OnSelected()
{
InMemory.Set("SelectedVideo", Video);
Mediator.NotifyColleagues("OnPlayVideo", Video);
if (InMemory.Can("tag"))
{
Mediator.NotifyColleagues("OnChangeTag", InMemory.Get("tag"));
}
else
{
Mediator.NotifyColleagues("OnChangeTag", string.Empty);
}
}
private void OnSelectMeta()
{
if (InMemory.Can("SelectedVideo"))
{
if (InMemory.Get("SelectedVideo") is Video video)
{
int fps = video.Fps;
TimeSpan duration = video.Duration;
long frame = (long)BeginFrame;
double time = ((double)frame / fps);
Mediator.NotifyColleagues("SetPosition", time);
Mediator.NotifyColleagues("OnProgress", time);
}
}
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (InMemory.Can("SelectedVideo"))
{
if (InMemory.Get("SelectedVideo") is Video video)
{
int fps = video.Fps;
TimeSpan duration = video.Duration;
long frame = (long)value;
int time = (int)(frame / fps);
return(new TimeSpan(0, 0, time));
}
}
return(value);
}
public IEnumerable <T> Visit <I>(SelectMany <T, I> selectMany)
{
return(InMemory
.Get(selectMany.Input)
.SelectMany(selectMany.Func));
}