no more submodule

GtkSharp/Source/Samples/MainWindow.cs

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+// This is free and unencumbered software released into the public domain.
+// Happy coding!!! - GtkSharp Team
+
+using Gtk;
+using GtkSource;
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Samples
+{
+    class MainWindow : Window
+    {
+        private HeaderBar _headerBar;
+        private TreeView _treeView;
+        private Box _boxContent;
+        private TreeStore _store;
+        private Dictionary<string, (Type type, Widget widget)> _items;
+        private SourceView _textViewCode;
+        private Notebook _notebook;
+
+        public MainWindow() : base(WindowType.Toplevel)
+        {
+            // Setup GUI
+            WindowPosition = WindowPosition.Center;
+            DefaultSize = new Gdk.Size(800, 600);
+
+            _headerBar = new HeaderBar();
+            _headerBar.ShowCloseButton = true;
+            _headerBar.Title = "GtkSharp Sample Application";
+
+            var btnClickMe = new Button();
+            btnClickMe.AlwaysShowImage = true;
+            btnClickMe.Image = Image.NewFromIconName("document-new-symbolic", IconSize.Button);
+            _headerBar.PackStart(btnClickMe);
+
+            Titlebar = _headerBar;
+
+            var hpanned = new HPaned();
+            hpanned.Position = 200;
+
+            _treeView = new TreeView();
+            _treeView.HeadersVisible = false;
+            hpanned.Pack1(_treeView, false, true);
+
+            _notebook = new Notebook();
+
+            var scroll1 = new ScrolledWindow();
+            var vpanned = new VPaned();
+            vpanned.Position = 300;
+            _boxContent = new Box(Orientation.Vertical, 0);
+            _boxContent.Margin = 8;
+            vpanned.Pack1(_boxContent, true, true);
+            vpanned.Pack2(ApplicationOutput.Widget, false, true);
+            scroll1.Child = vpanned;
+            _notebook.AppendPage(scroll1, new Label { Text = "Data", Expand = true });
+
+            var scroll2 = new ScrolledWindow();
+
+            _textViewCode = new SourceView();
+            _textViewCode.ShowLineNumbers = true;
+            _textViewCode.Buffer.Language = new LanguageManager().GetLanguage("c-sharp");
+
+            _textViewCode.Margin = 3;
+            scroll2.Child = _textViewCode;
+            _notebook.AppendPage(scroll2, new Label { Text = "Code", Expand = true });
+
+            hpanned.Pack2(_notebook, true, true);
+
+            Child = hpanned;
+
+            // Fill up data
+            FillUpTreeView();
+
+            // Connect events
+            _treeView.Selection.Changed += Selection_Changed;
+            Destroyed += (sender, e) => Application.Quit();
+        }
+
+        private void Selection_Changed(object sender, EventArgs e)
+        {
+            if (_treeView.Selection.GetSelected(out TreeIter iter))
+            {
+                var s = _store.GetValue(iter, 0).ToString();
+
+                while (_boxContent.Children.Length > 0)
+                    _boxContent.Remove(_boxContent.Children[0]);
+                _notebook.CurrentPage = 0;
+                _notebook.ShowTabs = false;
+
+                if (_items.TryGetValue(s, out var item))
+                {
+                    _notebook.ShowTabs = true;
+
+                    if (item.widget == null)
+                        _items[s] = item = (item.type, Activator.CreateInstance(item.type) as Widget);
+
+                    using (var stream = typeof(ListSection).Assembly.GetManifestResourceStream("GtkSharp.Samples." + item.type.Name + ".cs"))
+                        using (var reader = new StreamReader(stream))
+                            _textViewCode.Buffer.Text = reader.ReadToEnd();
+
+                    _boxContent.PackStart(item.widget, true, true, 0);
+                    _boxContent.ShowAll();
+                }
+
+            }
+        }
+
+        private void FillUpTreeView()
+        {
+            // Init cells
+            var cellName = new CellRendererText();
+
+            // Init columns
+            var columeSections = new TreeViewColumn();
+            columeSections.Title = "Sections";
+            columeSections.PackStart(cellName, true);
+
+            columeSections.AddAttribute(cellName, "text", 0);
+
+            _treeView.AppendColumn(columeSections);
+
+            // Init treeview
+            _store = new TreeStore(typeof(string));
+            _treeView.Model = _store;
+
+            // Setup category base
+            var dict = new Dictionary<Category, TreeIter>();
+            foreach (var category in Enum.GetValues(typeof(Category)))
+                dict[(Category)category] = _store.AppendValues(category.ToString());
+
+            // Fill up categories
+            _items = new Dictionary<string, (Type type, Widget widget)>();
+            var maintype = typeof(SectionAttribute);
+
+            foreach (var type in maintype.Assembly.GetTypes())
+            {
+                foreach (var attribute in type.GetCustomAttributes(true))
+                {
+                    if (attribute is SectionAttribute a)
+                    {
+                        _store.AppendValues(dict[a.Category], a.ContentType.Name);
+                        _items[a.ContentType.Name] = (type, null);
+                    }
+                }
+            }
+
+            _treeView.ExpandAll();
+        }
+    }
+}