3 files changed, 222 insertions, 1 deletions
diff --git a/Ryujinx/Ui/Applet/GtkDynamicTextInputHandler.cs b/Ryujinx/Ui/Applet/GtkDynamicTextInputHandler.cs
new file mode 100644
index 00000000..92e99385
--- /dev/null
+++ b/Ryujinx/Ui/Applet/GtkDynamicTextInputHandler.cs
@@ -0,0 +1,108 @@
+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 = (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 = (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;
+        }
+    }
+}
+\ No newline at end of file
diff --git a/Ryujinx/Ui/Applet/GtkHostUiHandler.cs b/Ryujinx/Ui/Applet/GtkHostUiHandler.cs
index c227ebd3..d81cbe3c 100644
--- a/Ryujinx/Ui/Applet/GtkHostUiHandler.cs
+++ b/Ryujinx/Ui/Applet/GtkHostUiHandler.cs
@@ -1,10 +1,11 @@
 using Gtk;
-using Ryujinx.HLE;
 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
 {
@@ -12,9 +13,13 @@ namespace Ryujinx.Ui.Applet
     {
         private readonly Window _parent;
 
+        public IHostUiTheme HostUiTheme { get; }
+
         public GtkHostUiHandler(Window parent)
         {
             _parent = parent;
+
+            HostUiTheme = new GtkHostUiTheme(parent);
         }
 
         public bool DisplayMessageDialog(ControllerAppletUiArgs args)
@@ -186,5 +191,23 @@ namespace Ryujinx.Ui.Applet
 
             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);
+        }
     }
 }
 \ No newline at end of file
diff --git a/Ryujinx/Ui/Applet/GtkHostUiTheme.cs b/Ryujinx/Ui/Applet/GtkHostUiTheme.cs
new file mode 100644
index 00000000..f25da47c
--- /dev/null
+++ b/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);
+        }
+    }
+}
+\ No newline at end of file