Add access to InfoBar extensibility

Change-Id: I5591ed5e3aa9fa94a110168f07a93391620dd931
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

3 files changed, 162 insertions, 0 deletions

diff --git a/QtVsTools.Package/QtVsTools.Package.csproj b/QtVsTools.Package/QtVsTools.Package.csproj
index 31898e9a..20247c84 100644
--- a/QtVsTools.Package/QtVsTools.Package.csproj
+++ b/QtVsTools.Package/QtVsTools.Package.csproj
@@ -451,6 +451,7 @@
     <Compile Include="Package\SR.cs" />
     <Compile Include="Package\Translation.cs" />
     <Compile Include="Package\TranslationItem.cs" />
+    <Compile Include="VisualStudio\InfoBar.cs" />
     <Compile Include="VisualStudio\VsShell.cs" />
     <Compile Include="Common\VsToolsDialogWindow.cs" />
     <Content Include="..\Changelog">
diff --git a/QtVsTools.Package/VisualStudio/InfoBar.cs b/QtVsTools.Package/VisualStudio/InfoBar.cs
new file mode 100644
index 00000000..082dd635
--- /dev/null
+++ b/QtVsTools.Package/VisualStudio/InfoBar.cs
@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt VS Tools.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using Microsoft.VisualStudio.Imaging.Interop;
+using Microsoft.VisualStudio.Shell;
+using Microsoft.VisualStudio.Shell.Interop;
+
+namespace QtVsTools.VisualStudio
+{
+    internal static class InfoBar
+    {
+        public interface IMessage
+        {
+            void Show();
+            void Close();
+            bool IsOpen { get; }
+        }
+
+        public class TextSpan
+        {
+            public string Text { get; set; }
+            public bool Bold { get; set; }
+            public bool Italic { get; set; }
+            public bool Underline { get; set; }
+            public static implicit operator TextSpan(string text) => new TextSpan { Text = text };
+        }
+
+        public class TextSpacer : TextSpan
+        {
+            public TextSpacer(int spaces)
+            {
+                Text = new string(' ', spaces);
+            }
+        }
+
+        public class Hyperlink
+        {
+            public string Text { get; set; }
+            public bool CloseInfoBar { get; set; }
+            public Action OnClicked { get; set; }
+        }
+
+        public class Message : IMessage, IVsInfoBarUIEvents
+        {
+            public ImageMoniker Icon { get; set; }
+            public TextSpan[] Text { get; set; }
+            public Hyperlink[] Hyperlinks { get; set; }
+
+            static IVsInfoBarUIFactory _Factory = null;
+            static IVsInfoBarUIFactory Factory => _Factory ?? (_Factory =
+                VsServiceProvider.GetService<SVsInfoBarUIFactory, IVsInfoBarUIFactory>());
+
+            public IVsInfoBarUIElement UIElement { get; private set; }
+            private uint cookie;
+
+            public bool IsOpen => UIElement != null;
+
+            public void Show()
+            {
+                ThreadHelper.ThrowIfNotOnUIThread();
+                if (Factory == null)
+                    return;
+                if (UIElement != null) // Message already shown
+                    return;
+                var textSpans = Enumerable.Empty<InfoBarTextSpan>();
+                if (Text != null) {
+                    textSpans = Text
+                        .Select(x => new InfoBarTextSpan(x.Text, x.Bold, x.Italic, x.Underline));
+                }
+                var hyperlinks = Enumerable.Empty<InfoBarHyperlink>();
+                if (Hyperlinks != null) {
+                    hyperlinks = Hyperlinks
+                        .Select(x => new InfoBarHyperlink(x.Text, x));
+                }
+                var model = new InfoBarModel(textSpans, hyperlinks, Icon, true);
+                UIElement = Factory.CreateInfoBar(model);
+                if (UIElement != null) {
+                    UIElement.Advise(this, out cookie);
+                    VsShell.InfoBarHost?.AddInfoBar(UIElement);
+                }
+            }
+
+            public void Close()
+            {
+                if (UIElement == null)
+                    return;
+
+                ThreadHelper.ThrowIfNotOnUIThread();
+                UIElement?.Close();
+            }
+
+            public void OnActionItemClicked(
+                IVsInfoBarUIElement infoBarUIElement,
+                IVsInfoBarActionItem actionItem)
+            {
+                Debug.Assert(infoBarUIElement == UIElement);
+                ThreadHelper.ThrowIfNotOnUIThread();
+                var hyperlink = actionItem.ActionContext as Hyperlink;
+                if (hyperlink == null)
+                    return;
+                if (hyperlink.CloseInfoBar)
+                    Close();
+                hyperlink.OnClicked?.Invoke();
+            }
+
+            public void OnClosed(IVsInfoBarUIElement infoBarUIElement)
+            {
+                Debug.Assert(infoBarUIElement == UIElement);
+                ThreadHelper.ThrowIfNotOnUIThread();
+                if (UIElement != null) {
+                    UIElement.Unadvise(cookie);
+                    UIElement = null;
+                    cookie = 0;
+                }
+            }
+        }
+    }
+}
diff --git a/QtVsTools.Package/VisualStudio/VsShell.cs b/QtVsTools.Package/VisualStudio/VsShell.cs
index 964e17e5..1aa2b467 100644
--- a/QtVsTools.Package/VisualStudio/VsShell.cs
+++ b/QtVsTools.Package/VisualStudio/VsShell.cs
@@ -84,5 +84,20 @@ namespace QtVsTools.VisualStudio
         {
             return GetProjectItem(context, itemid)?.Document;
         }
+
+        private static IVsInfoBarHost _InfoBarHost = null;
+        public static IVsInfoBarHost InfoBarHost
+        {
+            get
+            {
+                ThreadHelper.ThrowIfNotOnUIThread();
+                if (_InfoBarHost != null)
+                    return _InfoBarHost;
+                Initialize();
+                object host = null;
+                vsShell?.GetProperty((int)__VSSPROPID7.VSSPROPID_MainWindowInfoBarHost, out host);
+                return _InfoBarHost = host as IVsInfoBarHost;
+            }
+        }
     }
 }