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using System;
using System.Collections;
using System.Diagnostics;
using System.ComponentModel;
using Foundation;
using AppKit;
using CoreGraphics;
using Xamarin.PropertyEditing.ViewModels;
using Xamarin.PropertyEditing.Mac.Resources;
namespace Xamarin.PropertyEditing.Mac
{
internal class PredefinedValuesEditor<T>
: PropertyEditorControl
{
public PredefinedValuesEditor ()
{
base.TranslatesAutoresizingMaskIntoConstraints = false;
this.comboBox = new NSComboBox {
TranslatesAutoresizingMaskIntoConstraints = false,
BackgroundColor = NSColor.Clear,
StringValue = String.Empty,
Cell = {
ControlSize = NSControlSize.Small
},
Editable = false,
};
this.popUpButton = new NSPopUpButton {
TranslatesAutoresizingMaskIntoConstraints = false,
StringValue = String.Empty,
Cell = {
ControlSize = NSControlSize.Small
},
};
this.comboBox.SelectionChanged += (sender, e) => {
EditorViewModel.ValueName = comboBox.SelectedValue.ToString ();
};
popupButtonList = new NSMenu ();
popUpButton.Menu = popupButtonList;
popUpButton.Activated += (o, e) => {
EditorViewModel.ValueName = (o as NSPopUpButton).Title;
};
UpdateTheme ();
}
public override NSView FirstKeyView => firstKeyView;
public override NSView LastKeyView => lastKeyView;
protected PredefinedValuesViewModel<T> EditorViewModel => (PredefinedValuesViewModel<T>)ViewModel;
readonly NSComboBox comboBox;
readonly NSPopUpButton popUpButton;
NSMenu popupButtonList;
bool dataPopulated;
NSView firstKeyView;
NSView lastKeyView;
protected override void HandleErrorsChanged (object sender, DataErrorsChangedEventArgs e)
{
UpdateErrorsDisplayed (ViewModel.GetErrors (e.PropertyName));
}
protected override void SetEnabled ()
{
if (EditorViewModel.IsConstrainedToPredefined) {
this.popUpButton.Enabled = ViewModel.Property.CanWrite;
} else {
this.comboBox.Enabled = ViewModel.Property.CanWrite;
}
}
protected override void UpdateErrorsDisplayed (IEnumerable errors)
{
if (ViewModel.HasErrors) {
SetErrors (errors);
} else {
SetErrors (null);
SetEnabled ();
}
}
protected override void OnViewModelChanged (PropertyViewModel oldModel)
{
if (!dataPopulated) {
if (EditorViewModel.IsConstrainedToPredefined) {
this.popupButtonList.RemoveAllItems ();
foreach (string item in EditorViewModel.PossibleValues) {
popupButtonList.AddItem (new NSMenuItem (item));
}
AddSubview (this.popUpButton);
this.DoConstraints (new[] {
popUpButton.ConstraintTo (this, (pub, c) => pub.Width == c.Width - 26),
popUpButton.ConstraintTo (this, (pub, c) => pub.Left == c.Left + 3),
popUpButton.ConstraintTo (this, (pub, c) => pub.Top == c.Top + 6),
});
firstKeyView = this.popUpButton;
lastKeyView = this.popUpButton;
} else {
this.comboBox.RemoveAll ();
// Once the VM is loaded we need a one time population
foreach (var item in EditorViewModel.PossibleValues) {
this.comboBox.Add (new NSString (item));
}
AddSubview (this.comboBox);
this.DoConstraints (new[] {
comboBox.ConstraintTo (this, (cb, c) => cb.Width == c.Width - 28),
comboBox.ConstraintTo (this, (cb, c) => cb.Left == c.Left + 3),
comboBox.ConstraintTo (this, (cb, c) => cb.Top == c.Top + 4),
});
firstKeyView = this.comboBox;
lastKeyView = this.comboBox;
}
dataPopulated = true;
}
base.OnViewModelChanged (oldModel);
}
protected override void UpdateValue ()
{
if (EditorViewModel.IsConstrainedToPredefined) {
this.popUpButton.Title = EditorViewModel.ValueName ?? String.Empty;
} else {
this.comboBox.StringValue = EditorViewModel.ValueName ?? String.Empty;
}
}
protected override void UpdateAccessibilityValues ()
{
if (EditorViewModel.IsConstrainedToPredefined) {
popUpButton.AccessibilityEnabled = popUpButton.Enabled;
popUpButton.AccessibilityTitle = string.Format (LocalizationResources.AccessibilityCombobox, ViewModel.Property.Name);
} else {
comboBox.AccessibilityEnabled = comboBox.Enabled;
comboBox.AccessibilityTitle = string.Format (LocalizationResources.AccessibilityCombobox, ViewModel.Property.Name);
}
}
}
}
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