public async ValueTask LoadTags()
{
try
{
if (Interlocked.Increment(ref _loading) != 1)
{
return;
}
if (_loaded)
{
return;
}
var tags = await Model.ListTags(_query.QueryString, _query.TypeId, _query.Offset, _query.Limit);
if (tags != null && tags.Count > 0)
{
_query.Offset += _query.Limit;
foreach (var tag in tags.Where(it => SelectedTags.All(tag => tag.ObjectId != it.ObjectId)))
{
var displayTag = new DisplayTag(tag);
displayTag.ClickCommand = new AsyncCommand(async() =>
{
if (SelectedTags.All(it => it.ObjectId != displayTag.ObjectId))
{
displayTag.ClickCommand = new AsyncCommand(async() =>
{
SelectedTags.Remove(displayTag);
});
SelectedTags.Add(displayTag);
}
});
SearchResult.Add(displayTag);
}
}
else
{
_loaded = true;
}
}
finally
{
Interlocked.Decrement(ref _loading);
}
}
public TagSelectionViewModel(long typeId, List <Tag> selectedTags)
{
_query = new TagQueryHelper()
{
Limit = 100,
Offset = 0,
QueryString = null,
TypeId = typeId
};
SelectedTags = new ObservableCollection <DisplayTag>();
if (selectedTags == null)
{
return;
}
foreach (var selectedTag in selectedTags)
{
var displayTag = new DisplayTag(selectedTag);
displayTag.ClickCommand = new AsyncCommand(async() =>
{
SelectedTags.Remove(displayTag);
});
SelectedTags.Add(displayTag);
}
}
