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using System;
using System.Collections.Generic;
using System.Linq;
using AppKit;
using Foundation;
using Xamarin.PropertyEditing.ViewModels;
namespace Xamarin.PropertyEditing.Mac
{
internal class PropertyTableDataSource
: NSOutlineViewDataSource
{
internal PropertyTableDataSource (PanelViewModel panelVm)
{
if (panelVm == null)
throw new ArgumentNullException (nameof (panelVm));
this.vm = panelVm;
}
public PanelViewModel DataContext => this.vm;
public override nint GetChildrenCount (NSOutlineView outlineView, NSObject item)
{
if (this.vm.ArrangedEditors.Count == 0)
return 0;
if (this.vm.ArrangeMode == PropertyArrangeMode.Name)
return this.vm.ArrangedEditors[0].Count;
if (item == null)
return this.vm.ArrangedEditors.Count;
else {
return ((IGroupingList<string, EditorViewModel>)((NSObjectFacade)item).Target).Count;
}
}
public override NSObject GetChild (NSOutlineView outlineView, nint childIndex, NSObject item)
{
object element;
if (this.vm.ArrangeMode == PropertyArrangeMode.Name) {
element = (this.vm.ArrangedEditors[0][(int)childIndex]);
} else {
if (item == null)
element = this.vm.ArrangedEditors[(int)childIndex];
else {
element = ((IGroupingList<string, EditorViewModel>)((NSObjectFacade)item).Target)[(int)childIndex];
}
}
return GetFacade (element);
}
public override bool ItemExpandable (NSOutlineView outlineView, NSObject item)
{
if (this.vm.ArrangeMode == PropertyArrangeMode.Name)
return false;
return ((NSObjectFacade)item).Target is IGroupingList<string, EditorViewModel>;
}
public NSObject GetFacade (object element)
{
NSObject facade;
if (element is IGrouping<string, PropertyViewModel>) {
if (!this.groupFacades.TryGetValue (element, out facade)) {
this.groupFacades[element] = facade = new NSObjectFacade (element);
}
} else
facade = new NSObjectFacade (element);
return facade;
}
public bool TryGetFacade (object element, out NSObject facade)
{
return this.groupFacades.TryGetValue (element, out facade);
}
private readonly PanelViewModel vm;
private readonly Dictionary<object, NSObject> groupFacades = new Dictionary<object, NSObject> ();
}
}
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