public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
UIDropOperation operation = UIDropOperation.Cancel;
if (session.LocalDragSession == null)
{
return(new UIDropProposal(operation));
}
if (interaction.View is IVisualElementRenderer renderer)
{
DataPackage package = null;
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData cdi)
{
package = cdi.DataPackage;
}
if (HandleDragOver((View)renderer.Element, package))
{
operation = UIDropOperation.Copy;
}
}
return(new UIDropProposal(operation));
}
public override void SessionDidEnter(UIDropInteraction interaction, IUIDropSession session)
{
Console.WriteLine($"SessionDidEnter ({interaction}, {session})");
BeginInvokeOnMainThread(() => {
dropView.BackgroundColor = UIColor.Yellow;
});
}
public override void SessionDidExit(UIDropInteraction interaction, IUIDropSession session)
{
Console.WriteLine($"SessionDidExit ({interaction}, {session})");
BeginInvokeOnMainThread(() => {
dropView.BackgroundColor = dropView.defaultColor;
});
}
public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
if (session.LocalDragSession == null)
{
return(new UIDropProposal(UIDropOperation.Forbidden));
}
return(new UIDropProposal(UIDropOperation.Move));
}
public bool CanHandleDropSession(UICollectionView collectionView, IUIDropSession session)
{
if (album == null)
{
return(false);
}
return(session.HasConformingItems(UIImage.ReadableTypeIdentifiers));
}
public virtual void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
if (PerformDropOperation == null)
{
throw new NullReferenceException("The PerformDropOperation delegate must be defined before calling the 'PerformDrop' method");
}
PerformDropOperation(interaction, session);
}
public void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
// Get the drag items (UIImage in this case).
session.LoadObjects <UIImage> (images => {
ImageView.Image = images?.First();
});
var dropLocation = session.LocationInView(View);
UpdateLayers(dropLocation);
}
public override void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
Console.WriteLine($"PerformDrop ({interaction}, {session})");
INSItemProviderReading objectType = new StringReader();
session.Completion(objectType, (objects) => {
Console.WriteLine($"PerformDropCompletion ({objects.Length})");
dropView.BackgroundColor = UIColor.Green;
});
}
public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
UIDropOperation operation;
if (session.LocalDragSession == null)
{
operation = UIDropOperation.Copy;
}
else
{
operation = UIDropOperation.Move;
}
return(new UIDropProposal(operation));
}
public void SessionDidExit(UIDropInteraction interaction, IUIDropSession session)
{
DataPackage package = null;
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData cdi)
{
package = cdi.DataPackage;
}
if (HandleDragLeave((View)_viewHandler.VirtualView, package))
{
}
}
public void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
if (session.LocalDragSession == null)
{
DropPoint = session.LocationInView(interaction.View);
foreach (var dragItem in session.Items)
{
LoadImage(dragItem.ItemProvider, DropPoint);
}
}
else
{
MovePoint = session.LocationInView(interaction.View);
}
}
public void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
if (session.LocalDragSession == null)
{
return;
}
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData cdi &&
_viewHandler.VirtualView is View view)
{
HandleDrop(view, cdi.DataPackage);
HandleDropCompleted(cdi.View);
}
}
public bool CanHandleSession(UIDropInteraction interaction, IUIDropSession session)
{
if (session.LocalDragSession == null)
{
return(false);
}
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData)
{
return(true);
}
return(false);
}
public void PerformDrop(UIDropInteraction interaction, IUIDropSession session)
{
var label = interaction == oddDropInteraction ? OddNumbersLabel : EvenNumbersLabel;
session.LoadObjects <NSString>(strings =>
{
if (String.IsNullOrEmpty(label.Text))
{
label.Text = strings[0];
}
else
{
label.Text = $"{strings[0]}, {label.Text}";
}
});
GenerateNumber();
}
public void SessionDidExit(UIDropInteraction interaction, IUIDropSession session)
{
if (interaction.View is IVisualElementRenderer renderer)
{
DataPackage package = null;
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData cdi)
{
package = cdi.DataPackage;
}
if (HandleDragLeave((View)renderer.Element, package))
{
}
}
}
public List <UIView> LocalViewsForSession(IUIDropSession session)
{
var views = new List <UIView>();
if (session.LocalDragSession != null)
{
foreach (UIDragItem item in session.Items)
{
var view = item.LocalObject as UIView;
if (view != null)
{
views.Add(view);
}
}
}
return(views);
}
public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
UIDropProposal proposal;
var isEven = (session.Items[0].LocalObject as NSNumber).BoolValue;
if (interaction == oddDropInteraction && !isEven)
{
proposal = new UIDropProposal(UIDropOperation.Copy);
}
else if (interaction == evenDropInteraction && isEven)
{
proposal = new UIDropProposal(UIDropOperation.Copy);
}
else
{
proposal = new UIDropProposal(UIDropOperation.Forbidden);
}
return(proposal);
}
public UITableViewDropProposal DropSessionDidUpdate(UITableView tableView, IUIDropSession session, NSIndexPath destinationIndexPath)
{
// The .move operation is available only for dragging within a single app.
if (tableView.HasActiveDrag)
{
if (session.Items.Length > 1)
{
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
else
{
return(new UITableViewDropProposal(UIDropOperation.Move, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
}
else
{
return(new UITableViewDropProposal(UIDropOperation.Copy, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
}
/// <summary>
/// A drop proposal from a table view includes two items: a drop operation,
/// typically Move or Copy; and an intent, which declares the action the
/// table view will take upon receiving the items. (A drop proposal from a
/// custom view does includes only a drop operation, not an intent.)
/// </summary>
public UITableViewDropProposal DropSessionDidUpdate(UITableView tableView, IUIDropSession session, NSIndexPath destinationIndexPath)
{
// The Move operation is available only for dragging within a single app.
if (tableView.HasActiveDrag)
{
if (session.Items.Length > 1)
{
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
else
{ // allow reordering (doesn't call PerformDrop for single rows, instead calls MoveRow)
return(new UITableViewDropProposal(UIDropOperation.Move, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
}
else
{
return(new UITableViewDropProposal(UIDropOperation.Copy, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
}
public static NSProgress LoadObjects <T> (this IUIDropSession session, Action <T []> completion) where T : NSObject, INSItemProviderReading
{
return(session.LoadObjects(new Class(typeof(T)), (v) =>
{
var arr = v as T[];
if (arr == null && v != null)
{
arr = new T [v.Length];
for (int i = 0; i < arr.Length; i++)
{
if (v [i] != null)
{
arr [i] = Runtime.ConstructNSObject <T> (v [i].Handle);
}
}
}
completion(arr);
}));
}
public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
var dropLocation = session.LocationInView(View);
UpdateLayers(dropLocation);
var operation = new UIDropOperation();
if (ImageView.Frame.Contains(dropLocation))
{
operation = session.LocalDragSession == null ? UIDropOperation.Copy : UIDropOperation.Move;
}
else
{
// Cancel dropping if it's not inside the image view.
operation = UIDropOperation.Cancel;
}
return(new UIDropProposal(operation));
}
public UITableViewDropProposal DropSessionDidUpdate(UITableView tableView, IUIDropSession session, NSIndexPath destinationIndexPath)
{
if (destinationIndexPath == null)
{
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
// this dragging is from UITableView.
if (tableView.HasActiveDrag)
{
if (session.Items.Length > 1)
{
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
else
{
return(new UITableViewDropProposal(UIDropOperation.Move, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
}
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
public UITableViewDropProposal DropSessionDidUpdate(UITableView tableView, IUIDropSession session, Foundation.NSIndexPath destinationIndexPath)
{
if (tableView.Editing && tableView.HasActiveDrag)
{
return(new UITableViewDropProposal(UIDropOperation.Move, UITableViewDropIntent.InsertAtDestinationIndexPath));
}
else if (tableView.Editing || tableView.HasActiveDrag)
{
return(new UITableViewDropProposal(UIDropOperation.Forbidden));
}
else if (destinationIndexPath != null && destinationIndexPath.Row < albums.Count)
{
if (session.LocalDragSession != null)
{
return(new UITableViewDropProposal(UIDropOperation.Move, UITableViewDropIntent.InsertIntoDestinationIndexPath));
}
else
{
return(new UITableViewDropProposal(UIDropOperation.Copy, UITableViewDropIntent.InsertIntoDestinationIndexPath));
}
}
return(new UITableViewDropProposal(UIDropOperation.Cancel));
}
public UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
UIDropOperation operation = UIDropOperation.Cancel;
if (session.LocalDragSession == null)
{
return(new UIDropProposal(operation));
}
DataPackage package = null;
if (session.LocalDragSession.Items.Length > 0 &&
session.LocalDragSession.Items[0].LocalObject is CustomLocalStateData cdi)
{
package = cdi.DataPackage;
}
if (HandleDragOver((View)_viewHandler.VirtualView, package))
{
operation = UIDropOperation.Copy;
}
return(new UIDropProposal(operation));
}
public bool CanHandleDropSession(UITableView tableView, IUIDropSession session)
{
return(session.CanLoadObjects(typeof(NSString)));
}
public override UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
Console.WriteLine($"SessionDidUpdate ({interaction}, {session})");
return(new UIDropProposal(UIDropOperation.Copy));
}
/// <summary>
/// A helper function that serves as an interface to the data model,
/// called by the implementation of the `tableView(_ canHandle:)` method.
/// </summary>
public bool CanHandle(IUIDropSession session)
{
return(session.CanLoadObjects(typeof(NSString)));
}
public virtual UIDropProposal SessionDidUpdate(UIDropInteraction interaction, IUIDropSession session)
{
if (ResolveDropOperation == null)
{
throw new NullReferenceException("The ResolveDropOperation delegate must be defined before calling the 'SessionDidUpdate' method");
}
return(new UIDropProposal(ResolveDropOperation(this, interaction, session)));
}
public override bool CanHandleSession(UIDropInteraction interaction, IUIDropSession session)
{
Console.WriteLine($"CanHandleSession ({interaction}, {session})");
return(session.CanLoadObjectsOfClass(new Class(typeof(NSString))));
}
public void DropSessionDidExit(UITableView tableView, IUIDropSession session)
{
}
