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using System;
using System.ComponentModel;
using Foundation;
using AppKit;
using Xamarin.PropertyEditing.ViewModels;
using Xamarin.PropertyEditing.Mac.Resources;
namespace Xamarin.PropertyEditing.Mac
{
internal class PredefinedValuesEditor<T>
: PropertyEditorControl<PredefinedValuesViewModel<T>>
{
public PredefinedValuesEditor (IHostResourceProvider hostResources)
: base (hostResources)
{
base.TranslatesAutoresizingMaskIntoConstraints = false;
this.comboBox = new FocusableComboBox {
AllowsExpansionToolTips = true,
BackgroundColor = NSColor.Clear,
Cell = {
LineBreakMode = NSLineBreakMode.TruncatingTail,
UsesSingleLineMode = true,
},
ControlSize = NSControlSize.Small,
Font = NSFont.SystemFontOfSize (NSFont.SystemFontSizeForControlSize (NSControlSize.Small)),
TranslatesAutoresizingMaskIntoConstraints = false,
StringValue = String.Empty,
};
this.comboBox.SelectionChanged += (sender, e) => {
ViewModel.ValueName = this.comboBox.SelectedValue.ToString ();
};
this.popUpButton = new FocusablePopUpButton {
AllowsExpansionToolTips = true,
Cell = {
LineBreakMode = NSLineBreakMode.TruncatingTail,
UsesSingleLineMode = true,
},
ControlSize = NSControlSize.Small,
Font = NSFont.SystemFontOfSize (NSFont.SystemFontSizeForControlSize (NSControlSize.Small)),
TranslatesAutoresizingMaskIntoConstraints = false,
StringValue = String.Empty,
};
popupButtonList = new NSMenu ();
this.popUpButton.Menu = popupButtonList;
this.popUpButton.Activated += (o, e) => {
ViewModel.ValueName = (o as NSPopUpButton).Title;
};
}
public override NSView FirstKeyView => this.firstKeyView;
public override NSView LastKeyView => this.lastKeyView;
private readonly NSComboBox comboBox;
private readonly NSPopUpButton popUpButton;
private NSMenu popupButtonList;
private bool dataPopulated;
private NSView firstKeyView;
private NSView lastKeyView;
protected override void HandleErrorsChanged (object sender, DataErrorsChangedEventArgs e)
{
UpdateErrorsDisplayed (ViewModel.GetErrors (e.PropertyName));
}
protected override void SetEnabled ()
{
if (ViewModel.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)
{
base.OnViewModelChanged (oldModel);
if (ViewModel == null)
return;
if (!this.dataPopulated) {
if (ViewModel.IsConstrainedToPredefined) {
this.popupButtonList.RemoveAllItems ();
foreach (var item in ViewModel.PossibleValues) {
this.popupButtonList.AddItem (new NSMenuItem (item));
}
AddSubview (this.popUpButton);
this.AddConstraints (new[] {
NSLayoutConstraint.Create (this.popUpButton, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal, this, NSLayoutAttribute.CenterY, 1f, 0f),
NSLayoutConstraint.Create (this.popUpButton, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1f, 0f),
NSLayoutConstraint.Create (this.popUpButton, NSLayoutAttribute.Width, NSLayoutRelation.Equal, this, NSLayoutAttribute.Width, 1f, 0),
});
this.firstKeyView = this.popUpButton;
this.lastKeyView = this.popUpButton;
} else {
this.comboBox.RemoveAll ();
// Once the VM is loaded we need a one time population
foreach (var item in ViewModel.PossibleValues) {
this.comboBox.Add (new NSString (item));
}
AddSubview (this.comboBox);
this.AddConstraints (new[] {
NSLayoutConstraint.Create (this.comboBox, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal, this, NSLayoutAttribute.CenterY, 1f, 0f),
NSLayoutConstraint.Create (this.comboBox, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1f, 0f),
NSLayoutConstraint.Create (this.comboBox, NSLayoutAttribute.Width, NSLayoutRelation.Equal, this, NSLayoutAttribute.Width, 1f, 0),
});
this.firstKeyView = this.comboBox;
this.lastKeyView = this.comboBox;
}
this.dataPopulated = true;
}
SetEnabled ();
}
protected override void UpdateValue ()
{
if (ViewModel.IsConstrainedToPredefined) {
this.popUpButton.Title = ViewModel.ValueName ?? String.Empty;
} else {
this.comboBox.StringValue = ViewModel.ValueName ?? String.Empty;
}
}
protected override void UpdateAccessibilityValues ()
{
if (ViewModel.IsConstrainedToPredefined) {
this.popUpButton.AccessibilityEnabled = this.popUpButton.Enabled;
this.popUpButton.AccessibilityTitle = string.Format (LocalizationResources.AccessibilityCombobox, ViewModel.Property.Name);
} else {
this.comboBox.AccessibilityEnabled = this.comboBox.Enabled;
this.comboBox.AccessibilityTitle = string.Format (LocalizationResources.AccessibilityCombobox, ViewModel.Property.Name);
}
}
}
}
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