// user tapped "blur" or "sepia" buttons (lower right)
public override void PrepareForSegue(UIStoryboardSegue segue, NSObject sender)
{
base.PrepareForSegue(segue, sender);
string key = null;
string segueIdentifier = segue.Identifier;
if (segueIdentifier == "showBlurInfo")
{
key = BlurFilter.Key;
}
else if (segueIdentifier == "showModifyInfo")
{
key = ModifyFilter.Key;
}
if (key == null)
{
return;
}
ImageFilter filter = CreateImageFilter(key);
var filterViewController = (FilterViewController)segue.DestinationViewController;
filterViewController.Filter = filter;
}
void PresentFilter(NSObject sender)
{
var button = (UIBarButtonItem)sender;
string key = null, identifier = null;
if (button.Tag == BlurButtonTag)
{
key = BlurFilter.Key;
identifier = "blurController";
}
else if (button.Tag == SepiaButtonTag)
{
key = ModifyFilter.Key;
identifier = "modsController";
}
if (key == null)
{
return;
}
currentlyPresentedFilterTitle = button.Title;
ImageFilter filter = CreateImageFilter(key);
// check for activity view controller is open, dismiss it
TryDismiss(activityViewController, () => {
activityViewController = null;
TryDismiss(currentFilterViewController, () => CreateAndPresentFilterVC(button, filter, identifier));
});
}
void CreateAndPresentFilterVC(UIBarButtonItem sender, ImageFilter filter, string identifier)
{
currentFilterViewController = (FilterViewController)Storyboard.InstantiateViewController(identifier);
currentFilterViewController.Filter = filter;
currentFilterViewController.ModalPresentationStyle = UIModalPresentationStyle.Popover;
currentFilterViewController.PopoverPresentationController.BarButtonItem = sender;
currentFilterViewController.UserActivity = UserActivity;
// so "WasDismissed" can be called
currentFilterViewController.MasterViewController = this;
// so "popoverPresentationControllerDidDismissPopover" can be called
currentFilterViewController.PopoverPresentationController.WeakDelegate = this;
PresentViewController(currentFilterViewController, true, () => UpdateImage(false, false));
}
static ImageFilter CreateFilter(string key, bool setDefaults)
{
ImageFilter filter = null;
if (key == BlurFilter.Key)
{
filter = new BlurFilter(setDefaults);
}
else if (key == ModifyFilter.Key)
{
filter = new ModifyFilter(setDefaults);
}
else
{
throw new NotImplementedException();
}
UIApplication.RegisterObjectForStateRestoration(filter, key);
filter.Dirty = false;
filter.RestorationType = typeof(DetailViewController);
return(filter);
}
void Subscribe(ImageFilter subject)
{
subject.DirtyChanged += OnDirtyChanged;
}
void Subscribe(ImageFilter subject)
{
subject.DirtyChanged += OnDirtyChanged;
}
void CreateAndPresentFilterVC(UIBarButtonItem sender, ImageFilter filter, string identifier)
{
currentFilterViewController = (FilterViewController)Storyboard.InstantiateViewController (identifier);
currentFilterViewController.Filter = filter;
currentFilterViewController.ModalPresentationStyle = UIModalPresentationStyle.Popover;
currentFilterViewController.PopoverPresentationController.BarButtonItem = sender;
currentFilterViewController.UserActivity = UserActivity;
// so "WasDismissed" can be called
currentFilterViewController.MasterViewController = this;
// so "popoverPresentationControllerDidDismissPopover" can be called
currentFilterViewController.PopoverPresentationController.WeakDelegate = this;
PresentViewController (currentFilterViewController, true, () => UpdateImage (false, false));
}