Move solution and projects to src

src/Ryujinx/Ui/Applet/ErrorAppletDialog.cs

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+using Gtk;
+using Ryujinx.Ui.Common.Configuration;
+using System.Reflection;
+
+namespace Ryujinx.Ui.Applet
+{
+    internal class ErrorAppletDialog : MessageDialog
+    {
+        public ErrorAppletDialog(Window parentWindow, DialogFlags dialogFlags, MessageType messageType, string[] buttons) : base(parentWindow, dialogFlags, messageType, ButtonsType.None, null)
+        {
+            Icon = new Gdk.Pixbuf(Assembly.GetAssembly(typeof(ConfigurationState)), "Ryujinx.Ui.Common.Resources.Logo_Ryujinx.png");
+
+            int responseId = 0;
+
+            if (buttons != null)
+            {
+                foreach (string buttonText in buttons)
+                {
+                    AddButton(buttonText, responseId);
+                    responseId++;
+                }
+            }
+            else
+            {
+                AddButton("OK", 0);
+            }
+            
+            ShowAll();
+        }
+    }
+}

src/Ryujinx/Ui/Applet/GtkDynamicTextInputHandler.cs

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+using Gtk;
+using Ryujinx.HLE.Ui;
+using Ryujinx.Input.GTK3;
+using Ryujinx.Ui.Widgets;
+using System.Threading;
+
+namespace Ryujinx.Ui.Applet
+{
+    /// <summary>
+    /// Class that forwards key events to a GTK Entry so they can be processed into text.
+    /// </summary>
+    internal class GtkDynamicTextInputHandler : IDynamicTextInputHandler
+    {
+        private readonly Window              _parent;
+        private readonly OffscreenWindow     _inputToTextWindow = new OffscreenWindow();
+        private readonly RawInputToTextEntry _inputToTextEntry  = new RawInputToTextEntry();
+
+        private bool _canProcessInput;
+
+        public event DynamicTextChangedHandler TextChangedEvent;
+        public event KeyPressedHandler         KeyPressedEvent;
+        public event KeyReleasedHandler        KeyReleasedEvent;
+
+        public bool TextProcessingEnabled
+        {
+            get
+            {
+                return Volatile.Read(ref _canProcessInput);
+            }
+
+            set
+            {
+                Volatile.Write(ref _canProcessInput, value);
+            }
+        }
+
+        public GtkDynamicTextInputHandler(Window parent)
+        {
+            _parent = parent;
+            _parent.KeyPressEvent   += HandleKeyPressEvent;
+            _parent.KeyReleaseEvent += HandleKeyReleaseEvent;
+
+            _inputToTextWindow.Add(_inputToTextEntry);
+
+            _inputToTextEntry.TruncateMultiline = true;
+
+            // Start with input processing turned off so the text box won't accumulate text 
+            // if the user is playing on the keyboard.
+            _canProcessInput = false;
+        }
+
+        [GLib.ConnectBefore()]
+        private void HandleKeyPressEvent(object o, KeyPressEventArgs args)
+        {
+            var key = (Ryujinx.Common.Configuration.Hid.Key)GTK3MappingHelper.ToInputKey(args.Event.Key);
+
+            if (!(KeyPressedEvent?.Invoke(key)).GetValueOrDefault(true))
+            {
+                return;
+            }
+
+            if (_canProcessInput)
+            {
+                _inputToTextEntry.SendKeyPressEvent(o, args);
+                _inputToTextEntry.GetSelectionBounds(out int selectionStart, out int selectionEnd);
+                TextChangedEvent?.Invoke(_inputToTextEntry.Text, selectionStart, selectionEnd, _inputToTextEntry.OverwriteMode);
+            }
+        }
+
+        [GLib.ConnectBefore()]
+        private void HandleKeyReleaseEvent(object o, KeyReleaseEventArgs args)
+        {
+            var key = (Ryujinx.Common.Configuration.Hid.Key)GTK3MappingHelper.ToInputKey(args.Event.Key);
+
+            if (!(KeyReleasedEvent?.Invoke(key)).GetValueOrDefault(true))
+            {
+                return;
+            }
+
+            if (_canProcessInput)
+            {
+                // TODO (caian): This solution may have problems if the pause is sent after a key press
+                // and before a key release. But for now GTK Entry does not seem to use release events.
+                _inputToTextEntry.SendKeyReleaseEvent(o, args);
+                _inputToTextEntry.GetSelectionBounds(out int selectionStart, out int selectionEnd);
+                TextChangedEvent?.Invoke(_inputToTextEntry.Text, selectionStart, selectionEnd, _inputToTextEntry.OverwriteMode);
+            }
+        }
+
+        public void SetText(string text, int cursorBegin)
+        {
+            _inputToTextEntry.Text = text;
+            _inputToTextEntry.Position = cursorBegin;
+        }
+
+        public void SetText(string text, int cursorBegin, int cursorEnd)
+        {
+            _inputToTextEntry.Text = text;
+            _inputToTextEntry.SelectRegion(cursorBegin, cursorEnd);
+        }
+
+        public void Dispose()
+        {
+            _parent.KeyPressEvent   -= HandleKeyPressEvent;
+            _parent.KeyReleaseEvent -= HandleKeyReleaseEvent;
+        }
+    }
+}

src/Ryujinx/Ui/Applet/GtkHostUiHandler.cs

@@ -0,0 +1,213 @@
+using Gtk;
+using Ryujinx.HLE.HOS.Applets;
+using Ryujinx.HLE.HOS.Services.Am.AppletOE.ApplicationProxyService.ApplicationProxy.Types;
+using Ryujinx.HLE.Ui;
+using Ryujinx.Ui.Widgets;
+using System;
+using System.Threading;
+using Action = System.Action;
+
+namespace Ryujinx.Ui.Applet
+{
+    internal class GtkHostUiHandler : IHostUiHandler
+    {
+        private readonly Window _parent;
+
+        public IHostUiTheme HostUiTheme { get; }
+
+        public GtkHostUiHandler(Window parent)
+        {
+            _parent = parent;
+
+            HostUiTheme = new GtkHostUiTheme(parent);
+        }
+
+        public bool DisplayMessageDialog(ControllerAppletUiArgs args)
+        {
+            string playerCount = args.PlayerCountMin == args.PlayerCountMax ? $"exactly {args.PlayerCountMin}" : $"{args.PlayerCountMin}-{args.PlayerCountMax}";
+
+            string message = $"Application requests <b>{playerCount}</b> player(s) with:\n\n"
+                           + $"<tt><b>TYPES:</b> {args.SupportedStyles}</tt>\n\n"
+                           + $"<tt><b>PLAYERS:</b> {string.Join(", ", args.SupportedPlayers)}</tt>\n\n"
+                           + (args.IsDocked ? "Docked mode set. <tt>Handheld</tt> is also invalid.\n\n" : "")
+                           + "<i>Please reconfigure Input now and then press OK.</i>";
+
+            return DisplayMessageDialog("Controller Applet", message);
+        }
+
+        public bool DisplayMessageDialog(string title, string message)
+        {
+            ManualResetEvent dialogCloseEvent = new ManualResetEvent(false);
+
+            bool okPressed = false;
+
+            Application.Invoke(delegate
+            {
+                MessageDialog msgDialog = null;
+
+                try
+                {
+                    msgDialog = new MessageDialog(_parent, DialogFlags.DestroyWithParent, MessageType.Info, ButtonsType.Ok, null)
+                    {
+                        Title     = title,
+                        Text      = message,
+                        UseMarkup = true
+                    };
+
+                    msgDialog.SetDefaultSize(400, 0);
+
+                    msgDialog.Response += (object o, ResponseArgs args) =>
+                    {
+                        if (args.ResponseId == ResponseType.Ok)
+                        {
+                            okPressed = true;
+                        }
+
+                        dialogCloseEvent.Set();
+                        msgDialog?.Dispose();
+                    };
+
+                    msgDialog.Show();
+                }
+                catch (Exception ex)
+                {
+                    GtkDialog.CreateErrorDialog($"Error displaying Message Dialog: {ex}");
+
+                    dialogCloseEvent.Set();
+                }
+            });
+
+            dialogCloseEvent.WaitOne();
+
+            return okPressed;
+        }
+
+        public bool DisplayInputDialog(SoftwareKeyboardUiArgs args, out string userText)
+        {
+            ManualResetEvent dialogCloseEvent = new ManualResetEvent(false);
+
+            bool   okPressed = false;
+            bool   error     = false;
+            string inputText = args.InitialText ?? "";
+
+            Application.Invoke(delegate
+            {
+                try
+                {
+                    var swkbdDialog = new SwkbdAppletDialog(_parent)
+                    {
+                        Title         = "Software Keyboard",
+                        Text          = args.HeaderText,
+                        SecondaryText = args.SubtitleText
+                    };
+
+                    swkbdDialog.InputEntry.Text            = inputText;
+                    swkbdDialog.InputEntry.PlaceholderText = args.GuideText;
+                    swkbdDialog.OkButton.Label             = args.SubmitText;
+
+                    swkbdDialog.SetInputLengthValidation(args.StringLengthMin, args.StringLengthMax);
+
+                    if (swkbdDialog.Run() == (int)ResponseType.Ok)
+                    {
+                        inputText = swkbdDialog.InputEntry.Text;
+                        okPressed = true;
+                    }
+
+                    swkbdDialog.Dispose();
+                }
+                catch (Exception ex)
+                {
+                    error = true;
+
+                    GtkDialog.CreateErrorDialog($"Error displaying Software Keyboard: {ex}");
+                }
+                finally
+                {
+                    dialogCloseEvent.Set();
+                }
+            });
+
+            dialogCloseEvent.WaitOne();
+
+            userText = error ? null : inputText;
+
+            return error || okPressed;
+        }
+
+        public void ExecuteProgram(HLE.Switch device, ProgramSpecifyKind kind, ulong value)
+        {
+            device.Configuration.UserChannelPersistence.ExecuteProgram(kind, value);
+            ((MainWindow)_parent).RendererWidget?.Exit();
+        }
+
+        public bool DisplayErrorAppletDialog(string title, string message, string[] buttons)
+        {
+            ManualResetEvent dialogCloseEvent = new ManualResetEvent(false);
+
+            bool showDetails = false;
+
+            Application.Invoke(delegate
+            {
+                try
+                {
+                    ErrorAppletDialog msgDialog = new ErrorAppletDialog(_parent, DialogFlags.DestroyWithParent, MessageType.Error, buttons)
+                    {
+                        Title          = title,
+                        Text           = message,
+                        UseMarkup      = true,
+                        WindowPosition = WindowPosition.CenterAlways
+                    };
+
+                    msgDialog.SetDefaultSize(400, 0);
+
+                    msgDialog.Response += (object o, ResponseArgs args) =>
+                    {
+                        if (buttons != null)
+                        {
+                            if (buttons.Length > 1)
+                            {
+                                if (args.ResponseId != (ResponseType)(buttons.Length - 1))
+                                {
+                                    showDetails = true;
+                                }
+                            }
+                        }
+
+                        dialogCloseEvent.Set();
+                        msgDialog?.Dispose();
+                    };
+
+                    msgDialog.Show();
+                }
+                catch (Exception ex)
+                {
+                    GtkDialog.CreateErrorDialog($"Error displaying ErrorApplet Dialog: {ex}");
+
+                    dialogCloseEvent.Set();
+                }
+            });
+
+            dialogCloseEvent.WaitOne();
+
+            return showDetails;
+        }
+
+        private void SynchronousGtkInvoke(Action action)
+        {
+            var waitHandle = new ManualResetEventSlim();
+
+            Application.Invoke(delegate
+            {
+                action();
+                waitHandle.Set();
+            });
+
+            waitHandle.Wait();
+        }
+
+        public IDynamicTextInputHandler CreateDynamicTextInputHandler()
+        {
+            return new GtkDynamicTextInputHandler(_parent);
+        }
+    }
+}

src/Ryujinx/Ui/Applet/GtkHostUiTheme.cs

@@ -0,0 +1,90 @@
+using Gtk;
+using Ryujinx.HLE.Ui;
+using System.Diagnostics;
+
+namespace Ryujinx.Ui.Applet
+{
+    internal class GtkHostUiTheme : IHostUiTheme
+    {
+        private const int RenderSurfaceWidth  = 32;
+        private const int RenderSurfaceHeight = 32;
+
+        public string FontFamily { get; private set; }
+
+        public ThemeColor DefaultBackgroundColor { get; }
+        public ThemeColor DefaultForegroundColor { get; }
+        public ThemeColor DefaultBorderColor { get; }
+        public ThemeColor SelectionBackgroundColor { get; }
+        public ThemeColor SelectionForegroundColor { get; }
+
+        public GtkHostUiTheme(Window parent)
+        {
+            Entry entry = new Entry();
+            entry.SetStateFlags(StateFlags.Selected, true);
+
+            // Get the font and some colors directly from GTK.
+            FontFamily = entry.PangoContext.FontDescription.Family;
+
+            // Get foreground colors from the style context.
+
+            var defaultForegroundColor = entry.StyleContext.GetColor(StateFlags.Normal);
+            var selectedForegroundColor = entry.StyleContext.GetColor(StateFlags.Selected);
+
+            DefaultForegroundColor   = new ThemeColor((float) defaultForegroundColor.Alpha, (float) defaultForegroundColor.Red, (float) defaultForegroundColor.Green, (float) defaultForegroundColor.Blue);
+            SelectionForegroundColor = new ThemeColor((float)selectedForegroundColor.Alpha, (float)selectedForegroundColor.Red, (float)selectedForegroundColor.Green, (float)selectedForegroundColor.Blue);
+
+            ListBoxRow row = new ListBoxRow();
+            row.SetStateFlags(StateFlags.Selected, true);
+
+            // Request the main thread to render some UI elements to an image to get an approximation for the color.
+            // NOTE (caian): This will only take the color of the top-left corner of the background, which may be incorrect
+            // if someone provides a custom style with a gradient or image.
+
+            using (var surface = new Cairo.ImageSurface(Cairo.Format.Argb32, RenderSurfaceWidth, RenderSurfaceHeight))
+            using (var context = new Cairo.Context(surface))
+            {
+                context.SetSourceRGBA(1, 1, 1, 1);
+                context.Rectangle(0, 0, RenderSurfaceWidth, RenderSurfaceHeight);
+                context.Fill();
+
+                // The background color must be from the main Window because entry uses a different color.
+                parent.StyleContext.RenderBackground(context, 0, 0, RenderSurfaceWidth, RenderSurfaceHeight);
+
+                DefaultBackgroundColor = ToThemeColor(surface.Data);
+
+                context.SetSourceRGBA(1, 1, 1, 1);
+                context.Rectangle(0, 0, RenderSurfaceWidth, RenderSurfaceHeight);
+                context.Fill();
+
+                // Use the background color of the list box row when selected as the text box frame color because they are the
+                // same in the default theme.
+                row.StyleContext.RenderBackground(context, 0, 0, RenderSurfaceWidth, RenderSurfaceHeight);
+
+                DefaultBorderColor = ToThemeColor(surface.Data);
+            }
+
+            // Use the border color as the text selection color.
+            SelectionBackgroundColor = DefaultBorderColor;
+        }
+
+        private ThemeColor ToThemeColor(byte[] data)
+        {
+            Debug.Assert(data.Length == 4 * RenderSurfaceWidth * RenderSurfaceHeight);
+
+            // Take the center-bottom pixel of the surface.
+            int position = 4 * (RenderSurfaceWidth * (RenderSurfaceHeight - 1) + RenderSurfaceWidth / 2);
+
+            if (position + 4 > data.Length)
+            {
+                return new ThemeColor(1, 0, 0, 0);
+            }
+
+            float a = data[position + 3] / 255.0f;
+            float r = data[position + 2] / 255.0f;
+            float g = data[position + 1] / 255.0f;
+            float b = data[position + 0] / 255.0f;
+
+            return new ThemeColor(a, r, g, b);
+        }
+    }
+}

src/Ryujinx/Ui/Applet/SwkbdAppletDialog.cs

@@ -0,0 +1,89 @@
+using Gtk;
+using System;
+
+namespace Ryujinx.Ui.Applet
+{
+    public class SwkbdAppletDialog : MessageDialog
+    {
+        private int _inputMin;
+        private int _inputMax;
+
+        private Predicate<int> _checkLength;
+
+        private readonly Label _validationInfo;
+
+        public Entry  InputEntry   { get; }
+        public Button OkButton     { get; }
+        public Button CancelButton { get; }
+
+        public SwkbdAppletDialog(Window parent) : base(parent, DialogFlags.Modal | DialogFlags.DestroyWithParent, MessageType.Question, ButtonsType.None, null)
+        {
+            SetDefaultSize(300, 0);
+
+            _validationInfo = new Label()
+            {
+                Visible = false
+            };
+
+            InputEntry = new Entry()
+            {
+                Visible = true
+            };
+
+            InputEntry.Activated += OnInputActivated;
+            InputEntry.Changed   += OnInputChanged;
+
+            OkButton     = (Button)AddButton("OK",     ResponseType.Ok);
+            CancelButton = (Button)AddButton("Cancel", ResponseType.Cancel);
+
+            ((Box)MessageArea).PackEnd(_validationInfo, true, true, 0);
+            ((Box)MessageArea).PackEnd(InputEntry,      true, true, 4);
+
+            SetInputLengthValidation(0, int.MaxValue); // Disable by default.
+        }
+
+        public void SetInputLengthValidation(int min, int max)
+        {
+            _inputMin = Math.Min(min, max);
+            _inputMax = Math.Max(min, max);
+
+            _validationInfo.Visible = false;
+
+            if (_inputMin <= 0 && _inputMax == int.MaxValue) // Disable.
+            {
+                _validationInfo.Visible = false;
+
+                _checkLength = (length) => true;
+            }
+            else if (_inputMin > 0 && _inputMax == int.MaxValue)
+            {
+                _validationInfo.Visible = true;
+                _validationInfo.Markup  = $"<i>Must be at least {_inputMin} characters long</i>";
+
+                _checkLength = (length) => _inputMin <= length;
+            }
+            else
+            {
+                _validationInfo.Visible = true;
+                _validationInfo.Markup  = $"<i>Must be {_inputMin}-{_inputMax} characters long</i>";
+
+                _checkLength = (length) => _inputMin <= length && length <= _inputMax;
+            }
+
+            OnInputChanged(this, EventArgs.Empty);
+        }
+
+        private void OnInputActivated(object sender, EventArgs e)
+        {
+            if (OkButton.IsSensitive)
+            {
+                Respond(ResponseType.Ok);
+            }
+        }
+
+        private void OnInputChanged(object sender, EventArgs e)
+        {
+            OkButton.Sensitive = _checkLength(InputEntry.Text.Length);
+        }
+    }
+}