1 files changed, 184 insertions, 0 deletions
diff --git a/Xamarin.PropertyEditing.Mac/Controls/ObjectEditorControl.cs b/Xamarin.PropertyEditing.Mac/Controls/ObjectEditorControl.cs
new file mode 100644
index 0000000..ab9749b
--- /dev/null
+++ b/Xamarin.PropertyEditing.Mac/Controls/ObjectEditorControl.cs
@@ -0,0 +1,184 @@
+using System;
+using System.Collections;
+using System.ComponentModel;
+using System.Threading.Tasks;
+using AppKit;
+using Foundation;
+using Xamarin.PropertyEditing.ViewModels;
+
+namespace Xamarin.PropertyEditing.Mac
+{
+	internal class ObjectEditorControl
+		: PropertyEditorControl<ObjectPropertyViewModel>
+	{
+		public ObjectEditorControl (IHostResourceProvider hostResources)
+			: base (hostResources)
+		{
+			this.typeLabel = new UnfocusableTextField {
+				TranslatesAutoresizingMaskIntoConstraints = false
+			};
+			AddSubview (this.typeLabel);
+
+			this.createObject = new NSButton {
+				Title = Properties.Resources.New,
+				TranslatesAutoresizingMaskIntoConstraints = false,
+				BezelStyle = NSBezelStyle.Rounded
+			};
+			this.createObject.Activated += OnNewPressed;
+			AddSubview (this.createObject);
+
+			this.buttonConstraint = NSLayoutConstraint.Create (this.createObject, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, this.typeLabel, NSLayoutAttribute.Trailing, 1f, 12);
+
+			AddConstraints (new[] {
+				NSLayoutConstraint.Create (this.typeLabel, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, this, NSLayoutAttribute.Leading, 1f, 0f),
+				NSLayoutConstraint.Create (this.typeLabel, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal, this, NSLayoutAttribute.CenterY, 1f, 0f),
+				NSLayoutConstraint.Create (this.typeLabel, NSLayoutAttribute.Height, NSLayoutRelation.Equal, this, NSLayoutAttribute.Height, 1, 0),
+				this.buttonConstraint,
+				NSLayoutConstraint.Create (this.createObject, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, this, NSLayoutAttribute.Leading, 1, 0).WithPriority (NSLayoutPriority.DefaultLow),
+				NSLayoutConstraint.Create (this.createObject, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal, this, NSLayoutAttribute.CenterY, 1f, 0f),
+				NSLayoutConstraint.Create (this.createObject, NSLayoutAttribute.Width, NSLayoutRelation.GreaterThanOrEqual, 1f, 70f),
+			});
+		}
+
+		public override NSView FirstKeyView => this.createObject;
+
+		public override NSView LastKeyView => this.createObject;
+
+		protected override void UpdateValue ()
+		{
+		}
+
+		protected override void UpdateErrorsDisplayed (IEnumerable errors)
+		{
+		}
+
+		protected override void HandleErrorsChanged (object sender, DataErrorsChangedEventArgs e)
+		{
+		}
+
+		protected override void SetEnabled ()
+		{
+			this.createObject.Enabled = ViewModel.Property.CanWrite;
+		}
+
+		protected override void UpdateAccessibilityValues ()
+		{
+			this.createObject.AccessibilityTitle = String.Format (Properties.Resources.NewInstanceForProperty, ViewModel.Property.Name);
+		}
+
+		protected override void OnViewModelChanged (PropertyViewModel oldModel)
+		{
+			base.OnViewModelChanged (oldModel);
+
+			if (oldModel is ObjectPropertyViewModel ovm) {
+				ovm.TypeRequested -= OnTypeRequested;
+				ovm.CreateInstanceCommand.CanExecuteChanged -= OnCreateInstanceExecutableChanged;
+			}
+
+			if (ViewModel != null) {
+				ViewModel.TypeRequested += OnTypeRequested;
+				ViewModel.CreateInstanceCommand.CanExecuteChanged += OnCreateInstanceExecutableChanged;
+
+				OnPropertyChanged (ViewModel, new PropertyChangedEventArgs (null));
+			}
+		}
+
+		protected override void OnPropertyChanged (object sender, PropertyChangedEventArgs e)
+		{
+			switch (e.PropertyName) {
+			case nameof (ObjectPropertyViewModel.ValueType):
+				UpdateTypeLabel ();
+				break;
+			case null:
+			case "":
+				UpdateTypeLabel ();
+				UpdateCreateInstanceCommand ();
+				break;
+			}
+
+			base.OnPropertyChanged (sender, e);
+		}
+
+		private readonly UnfocusableTextField typeLabel;
+		private readonly NSButton createObject;
+		private readonly NSLayoutConstraint buttonConstraint;
+
+		private void OnCreateInstanceExecutableChanged (object sender, EventArgs e)
+		{
+			UpdateCreateInstanceCommand ();
+		}
+
+		private void OnTypeRequested (object sender, TypeRequestedEventArgs e)
+		{
+			var tcs = new TaskCompletionSource<ITypeInfo> ();
+			e.SelectedType = tcs.Task;
+
+			var vm = new TypeSelectorViewModel (ViewModel.AssignableTypes);
+			var selector = new TypeSelectorControl {
+				ViewModel = vm,
+				Appearance = EffectiveAppearance
+			};
+
+			vm.PropertyChanged += (vms, ve) => {
+				if (ve.PropertyName == nameof (TypeSelectorViewModel.SelectedType)) {
+					tcs.TrySetResult (vm.SelectedType);
+				}
+			};
+
+			var popover = new NSPopover {
+				Behavior = NSPopoverBehavior.Transient,
+				Delegate = new PopoverDelegate<ITypeInfo> (tcs),
+				ContentViewController = new NSViewController {
+					View = selector,
+					PreferredContentSize = new CoreGraphics.CGSize (360, 335)
+				},
+			};
+
+			popover.SetAppearance (HostResources.GetVibrantAppearance (EffectiveAppearance));
+
+			tcs.Task.ContinueWith (t => {
+				popover.PerformClose (popover);
+				popover.Dispose ();
+			}, TaskScheduler.FromCurrentSynchronizationContext());
+
+			popover.Show (this.createObject.Frame, this, NSRectEdge.MinYEdge);
+		}
+
+		private void UpdateTypeLabel ()
+		{
+			if (ViewModel.ValueType == null) {
+				this.typeLabel.StringValue = String.Empty;
+				this.buttonConstraint.Active = false;
+			} else {
+				this.typeLabel.StringValue = $"({ViewModel.ValueType.Name})";
+				this.buttonConstraint.Active = true;
+			}
+		}
+
+		private void UpdateCreateInstanceCommand()
+		{
+			this.createObject.Enabled = ViewModel.CreateInstanceCommand.CanExecute (null);
+		}
+
+		private void OnNewPressed (object sender, EventArgs e)
+		{
+			ViewModel.CreateInstanceCommand.Execute (null);
+		}
+
+		private class PopoverDelegate<T>
+			: NSPopoverDelegate
+		{
+			public PopoverDelegate (TaskCompletionSource<T> tcs)
+			{
+				this.tcs = tcs;
+			}
+
+			public override void WillClose (NSNotification notification)
+			{
+				this.tcs.TrySetCanceled ();
+			}
+
+			private readonly TaskCompletionSource<T> tcs;
+		}
+	}
+}