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using System;
using System.ComponentModel;
using Foundation;
using AppKit;
using Xamarin.PropertyEditing.ViewModels;
namespace Xamarin.PropertyEditing.Mac
{
internal class PredefinedValuesEditor<T>
: PropertyEditorControl<PredefinedValuesViewModel<T>>
{
public PredefinedValuesEditor (IHostResourceProvider hostResources)
: base (hostResources)
{
base.TranslatesAutoresizingMaskIntoConstraints = false;
}
public override NSView FirstKeyView => this.firstKeyView;
public override NSView LastKeyView => this.lastKeyView;
protected override void SetEnabled ()
{
if (ViewModel.IsConstrainedToPredefined) {
this.popupButton.Enabled = ViewModel.Property.CanWrite;
} else {
this.comboBox.Enabled = ViewModel.Property.CanWrite;
}
}
protected override void OnViewModelChanged (PropertyViewModel oldModel)
{
if (ViewModel == null)
return;
if (ViewModel.IsConstrainedToPredefined) {
RequirePopup ();
this.popupButtonList.RemoveAllItems ();
foreach (var item in ViewModel.PossibleValues) {
this.popupButtonList.AddItem (new NSMenuItem (item));
}
} else {
RequireComboBox ();
UnhookSelectionChangeAndClearItems ();
foreach (var item in ViewModel.PossibleValues) {
this.comboBox.Add (new NSString (item));
}
this.comboBox.SelectionChanged += ComboBox_SelectionChanged;
}
base.OnViewModelChanged (oldModel);
}
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 (Properties.Resources.AccessibilityPopUp, ViewModel.Property.Name);
} else {
this.comboBox.AccessibilityEnabled = this.comboBox.Enabled;
this.comboBox.AccessibilityTitle = string.Format (Properties.Resources.AccessibilityCombobox, ViewModel.Property.Name);
}
}
private NSComboBox comboBox;
private NSPopUpButton popupButton;
private NSMenu popupButtonList;
private NSView firstKeyView;
private NSView lastKeyView;
private void RemovePopup()
{
if (this.popupButton == null)
return;
this.popupButton.Activated -= PopupButton_Activated;
this.popupButton.RemoveFromSuperview ();
this.popupButton.Dispose ();
this.popupButton = null;
this.popupButtonList.RemoveAllItems ();
this.popupButtonList.Dispose ();
this.popupButtonList = null;
}
private void RequirePopup()
{
if (this.popupButton != null)
return;
RemoveComboBox ();
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,
ResponderProxy = new ProxyRowResponder(this, ProxyRowType.SingleView)
};
this.popupButtonList = new NSMenu ();
this.popupButton.Menu = this.popupButtonList;
this.popupButton.Activated += PopupButton_Activated;
AddSubview (this.popupButton);
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;
}
private void RemoveComboBox()
{
if (this.comboBox == null)
return;
UnhookSelectionChangeAndClearItems ();
this.comboBox.RemoveFromSuperview ();
this.comboBox.Dispose ();
this.comboBox = null;
}
private void RequireComboBox()
{
if (this.comboBox != null)
return;
RemovePopup ();
this.comboBox = new FocusableComboBox {
AllowsExpansionToolTips = true,
BackgroundColor = NSColor.Clear,
Cell = {
LineBreakMode = NSLineBreakMode.TruncatingTail,
UsesSingleLineMode = true,
},
ResponderProxy = new ProxyRowResponder (this, ProxyRowType.SingleView),
ControlSize = NSControlSize.Small,
Font = NSFont.SystemFontOfSize (NSFont.SystemFontSizeForControlSize (NSControlSize.Small)),
TranslatesAutoresizingMaskIntoConstraints = false,
StringValue = String.Empty,
};
this.comboBox.SelectionChanged += ComboBox_SelectionChanged;
AddSubview (this.comboBox);
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;
}
private void PopupButton_Activated (object sender, EventArgs e)
{
if (ViewModel != null && sender is NSPopUpButton popUpButton) {
ViewModel.ValueName = popUpButton.Title;
}
}
private void ComboBox_SelectionChanged (object sender, EventArgs e)
{
if (ViewModel != null
&& this.comboBox != null
&& this.comboBox.SelectedValue != null) {
ViewModel.ValueName = this.comboBox.SelectedValue.ToString ();
}
}
private void UnhookSelectionChangeAndClearItems ()
{
if (this.comboBox != null) {
this.comboBox.SelectionChanged -= ComboBox_SelectionChanged;
this.comboBox.RemoveAll ();
}
}
}
}
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