[NuGet] Make tab labels behave like real tabs with VO

Fixes VSTS #1021556

Author: sevoku

main/src/addins/MonoDevelop.PackageManagement/MonoDevelop.PackageManagement.Gui/ManagePackagesDialog.UI.cs

@@ -68,6 +68,7 @@ internal partial class ManagePackagesDialog : ExtendedTitleBarDialog
 		Label installedLabel;
 		Label updatesLabel;
 		Label consolidateLabel;
+		HBox tabGroup;
 		VBox projectsListViewVBox;
 		Label projectsListViewLabel;
 		ListView projectsListView;
@@ -99,40 +100,39 @@ void Build ()
 			packageSourceComboBox.MinWidth = 200;
 			topHBox.PackStart (packageSourceComboBox);
 
+			tabGroup = new HBox ();
+
 			int tabLabelMinWidth = 60;
 			browseLabel = new Label ();
 			browseLabel.Text = GettextCatalog.GetString ("Browse");
 			browseLabel.Tag = browseLabel.Text;
 			browseLabel.MinWidth = tabLabelMinWidth;
 			browseLabel.MarginLeft = 10;
 			browseLabel.CanGetFocus = true;
-			browseLabel.Accessible.Role = Xwt.Accessibility.Role.Button;
-
-			topHBox.PackStart (browseLabel);
+			tabGroup.PackStart (browseLabel);
 
 			installedLabel = new Label ();
 			installedLabel.Text = GettextCatalog.GetString ("Installed");
 			installedLabel.Tag = installedLabel.Text;
 			installedLabel.MinWidth = tabLabelMinWidth;
 			installedLabel.CanGetFocus = true;
-			installedLabel.Accessible.Role = Xwt.Accessibility.Role.Button;
-			topHBox.PackStart (installedLabel);
+			tabGroup.PackStart (installedLabel);
 
 			updatesLabel = new Label ();
 			updatesLabel.Text = GettextCatalog.GetString ("Updates");
 			updatesLabel.Tag = updatesLabel.Text;
 			updatesLabel.MinWidth = tabLabelMinWidth;
 			updatesLabel.CanGetFocus = true;
-			updatesLabel.Accessible.Role = Xwt.Accessibility.Role.Button;
-			topHBox.PackStart (updatesLabel);
+			tabGroup.PackStart (updatesLabel);
 
 			consolidateLabel = new Label ();
 			consolidateLabel.Text = GettextCatalog.GetString ("Consolidate");
 			consolidateLabel.Tag = consolidateLabel.Text;
 			consolidateLabel.MinWidth = tabLabelMinWidth;
 			consolidateLabel.CanGetFocus = true;
-			consolidateLabel.Accessible.Role = Xwt.Accessibility.Role.Button;
-			topHBox.PackStart (consolidateLabel);
+			tabGroup.PackStart (consolidateLabel);
+
+			topHBox.PackStart (tabGroup);
 
 			packageSearchEntry = new SearchTextEntry ();
 			packageSearchEntry.Name = "managePackagesDialogSearchEntry";

main/src/addins/MonoDevelop.PackageManagement/MonoDevelop.PackageManagement.Gui/ManagePackagesDialog.cs

@@ -27,6 +27,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using MonoDevelop.Components.AtkCocoaHelper;
 using MonoDevelop.Core;
 using MonoDevelop.Ide;
 using MonoDevelop.Projects;
@@ -90,7 +91,6 @@ public ManagePackagesDialog (
 			consolidateLabel.Visible = viewModel.IsManagingSolution;
 			UpdateDialogTitle ();
 			UpdatePackageSearchEntryWithInitialText (initialSearch);
-			UpdatePackageResultsPageLabels ();
 
 			InitializeListView ();
 			UpdateAddPackagesButton ();
@@ -113,6 +113,33 @@ public ManagePackagesDialog (
 			updatesLabel.KeyPressed += UpdatesLabelKeyPressed;
 			consolidateLabel.ButtonPressed += ConsolidateLabelButtonPressed;
 			consolidateLabel.KeyPressed += ConsolidateLabelKeyPressed;
+			UpdateTabAccessibility ();
+			UpdatePackageResultsPageLabels ();
+		}
+
+		void UpdateTabAccessibility ()
+		{
+			if (tabGroup.Surface.ToolkitEngine.Type == ToolkitType.Gtk) {
+				if (consolidateLabel.Parent.Surface.NativeWidget is Gtk.Container a11yGroup) {
+					a11yGroup.Accessible.SetRole (AtkCocoa.Roles.AXTabGroup);
+					var children = a11yGroup.Children;
+					var tabs = new List<Atk.Object> (children.Length);
+					foreach (var child in children) {
+						if (!child.Visible)
+							continue;
+						if (child is Gtk.EventBox box && box.Child is Gtk.Label) {
+							box.Accessible.SetTitleUIElement (box.Child.Accessible);
+							box.Child.Accessible.SetShouldIgnore (true);
+						}
+						var tab = child.Accessible;
+						tab.SetRole (AtkCocoa.Roles.AXRadioButton);
+						tab.SetSubRole (AtkCocoa.SubRoles.AXTabButton);
+						tab.SetValue (false);
+						tabs.Add (tab);
+					}
+					a11yGroup.Accessible.SetTabs (tabs.ToArray ());
+				}
+			}
 		}
 
 		public bool ShowPreferencesForPackageSources { get; private set; }
@@ -1110,12 +1137,26 @@ void UpdatePackageResultsLabel (ManagePackagesPage page, Label label)
 		{
 			string text = (string)label.Tag;
 			if (page == viewModel.PageSelected) {
+				UpdatePackageResultsLabelA11y (label, true);
 				label.Markup = string.Format ("<b><u>{0}</u></b>", text);
 			} else {
+				UpdatePackageResultsLabelA11y (label, false);
 				label.Markup = text;
 			}
 		}
 
+		static void UpdatePackageResultsLabelA11y (Label label, bool active)
+		{
+			if (label.Surface.ToolkitEngine.Type == ToolkitType.Gtk) {
+				var widget = label.Surface.NativeWidget as Gtk.Widget;
+				if (widget != null) {
+					widget.Accessible.SetValue (active);
+					// FIXME: Accessible.SetValue has no effect, so set the role description instead
+					widget.Accessible.SetRole (AtkCocoa.Roles.AXRadioButton, active ? "selected tab" : "tab");
+				}
+			}
+		}
+
 		void UpdatePackageResultsLabel (ManagePackagesPage page, Button label)
 		{
 			string text = (string)label.Tag;