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using System;
using AppKit;
using Foundation;
using Xamarin.PropertyEditing.ViewModels;
using ObjCRuntime;
namespace Xamarin.PropertyEditing.Mac
{
class DelegatedRowTextFieldDelegate : NSTextFieldDelegate
{
public ProxyResponder ProxyResponder { get; set; }
public override bool DoCommandBySelector (NSControl control, NSTextView textView, Selector commandSelector)
{
if (ProxyResponder != null)
{
switch (commandSelector.Name) {
case "insertTab:":
if (ProxyResponder.NextResponder ()) {
return true;
}
break;
case "insertBacktab:":
if (ProxyResponder.PreviousResponder ()) {
return true;
}
break;
}
}
return false;
}
}
internal abstract class EntryPropertyEditor<T>
: PropertyEditorControl<PropertyViewModel<T>>
{
public EntryPropertyEditor (IHostResourceProvider hostResources)
: base (hostResources)
{
Entry = new PropertyTextField {
BackgroundColor = NSColor.Clear,
ControlSize = NSControlSize.Small,
Font = NSFont.SystemFontOfSize (NSFont.SystemFontSizeForControlSize (NSControlSize.Small)),
TranslatesAutoresizingMaskIntoConstraints = false,
};
AddSubview (Entry);
Entry.Delegate = new DelegatedRowTextFieldDelegate ()
{
ProxyResponder = new ProxyResponder(this, ProxyRowType.SingleView)
};
RightEdgeConstraint = NSLayoutConstraint.Create (Entry, NSLayoutAttribute.Right, NSLayoutRelation.Equal, this, NSLayoutAttribute.Right, 1f, 0);
AddConstraints (new[] {
NSLayoutConstraint.Create (Entry, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal, this, NSLayoutAttribute.CenterY, 1f, 0),
NSLayoutConstraint.Create (Entry, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1, 0),
RightEdgeConstraint,
NSLayoutConstraint.Create (Entry, NSLayoutAttribute.Height, NSLayoutRelation.Equal, this, NSLayoutAttribute.Height, 1, -6),
});
}
public override NSView FirstKeyView => Entry;
public override NSView LastKeyView => Entry;
protected PropertyTextField Entry
{
get;
}
protected NSLayoutConstraint RightEdgeConstraint { get; }
protected override void OnViewModelChanged (PropertyViewModel oldModel)
{
base.OnViewModelChanged (oldModel);
Entry.Delegate = (ViewModel != null) ? CreateDelegate (ViewModel) : null;
}
protected override void UpdateValue ()
{
Entry.StringValue = GetValue (ViewModel.Value) ?? String.Empty;
}
protected override void SetEnabled ()
{
Entry.Enabled = ViewModel.Property.CanWrite;
}
protected override void UpdateAccessibilityValues ()
{
Entry.AccessibilityEnabled = Entry.Enabled;
}
protected virtual EntryPropertyEditorDelegate<T> CreateDelegate (PropertyViewModel<T> viewModel)
{
var propertyEditorDelegate = new EntryPropertyEditorDelegate<T> (viewModel)
{
ProxyResponder = new ProxyResponder (this, ProxyRowType.SingleView)
};
return propertyEditorDelegate;
}
protected virtual string GetValue (T value)
{
return value?.ToString ();
}
}
internal class EntryPropertyEditorDelegate<T>
: DelegatedRowTextFieldDelegate
{
public EntryPropertyEditorDelegate (PropertyViewModel<T> viewModel)
{
if (viewModel == null)
throw new ArgumentNullException (nameof (viewModel));
ViewModel = viewModel;
}
protected PropertyViewModel<T> ViewModel
{
get;
}
public override void EditingBegan (NSNotification notification)
{
NSTextField text = (NSTextField)notification.Object;
this.lastValid = text.StringValue;
}
public override void EditingEnded (NSNotification notification)
{
var text = (NSTextField)notification.Object;
ViewModel.Value = GetValue (text.StringValue);
}
public override bool TextShouldEndEditing (NSControl control, NSText fieldEditor)
{
if (!CanGetValue (fieldEditor.Value)) {
NSTextField text = (NSTextField)control;
text.StringValue = this.lastValid;
AppKitFramework.NSBeep ();
return false;
}
return true;
}
protected virtual T GetValue (string value)
{
if (String.IsNullOrEmpty (value))
return default (T);
return (T)Convert.ChangeType (value, typeof(T));
}
protected virtual bool CanGetValue (string value)
{
return true;
}
private string lastValid;
}
}
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