changed text input style to work on all devices including web

Demos.Android/Activity1.cs

@@ -2,23 +2,27 @@ using Android.App;
 using Android.Content.PM;
 using Android.OS;
 using Android.Views;
+using MLEM.Input;
 
 namespace Demos.Android {
     [Activity(Label = "Demos.Android"
         , MainLauncher = true
         , Icon = "@drawable/icon"
-        , Theme = "@style/Theme.Splash"
         , AlwaysRetainTaskState = true
         , LaunchMode = LaunchMode.SingleInstance
-        , ScreenOrientation = ScreenOrientation.UserLandscape
+        , ScreenOrientation = ScreenOrientation.FullUser
         , ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.Keyboard | ConfigChanges.KeyboardHidden | ConfigChanges.ScreenSize)]
     public class Activity1 : Microsoft.Xna.Framework.AndroidGameActivity {
 
         protected override void OnCreate(Bundle bundle) {
             base.OnCreate(bundle);
             var g = new GameImpl();
+            g.OnLoadContent += game => {
                 // disable mouse handling for android to make emulator behavior more coherent
-            g.OnLoadContent += game => game.InputHandler.HandleMouse = false;
+                game.InputHandler.HandleMouse = false;
+                // enable android text input style
+                game.InputHandler.TextInputStyle = new TextInputStyle.Mobile();
+            };
             this.SetContentView((View) g.Services.GetService(typeof(View)));
             g.Run();
         }

MLEM.Startup/MlemGame.cs

@@ -34,9 +34,9 @@ namespace MLEM.Startup {
 
         protected override void LoadContent() {
             this.SpriteBatch = new SpriteBatch(this.GraphicsDevice);
-            this.InputHandler = new InputHandler();
+            this.InputHandler = new InputHandler(this, textInputStyle: new TextInputStyle.DesktopGl());
             this.Components.Add(this.InputHandler);
-            this.UiSystem = new UiSystem(this.Window, this.GraphicsDevice, new UntexturedStyle(this.SpriteBatch), this.InputHandler);
+            this.UiSystem = new UiSystem(this, this.GraphicsDevice, new UntexturedStyle(this.SpriteBatch), this.InputHandler);
             this.Components.Add(this.UiSystem);
             this.OnLoadContent?.Invoke(this);
         }

MLEM.Ui/Elements/TextField.cs

@@ -47,13 +47,27 @@ namespace MLEM.Ui.Elements {
                 }
             }
         }
+        private bool init;
 
         public TextField(Anchor anchor, Vector2 size, Rule rule = null, IGenericFont font = null) : base(anchor, size) {
             this.InputRule = rule ?? DefaultRule;
             if (font != null)
                 this.Font.Set(font);
+        }
 
-            if (WindowExtensions.SupportsTextInput()) {
+        public override void ForceUpdateArea() {
+            if (!this.init) {
+                this.init = true;
+                if (this.Input.TextInputStyle.RequiresOnScreenKeyboard()) {
+                    this.OnPressed += async e => {
+                        if (!KeyboardInput.IsVisible) {
+                            var title = this.MobileTitle ?? this.PlaceholderText;
+                            var result = await KeyboardInput.Show(title, this.MobileDescription, this.Text);
+                            if (result != null)
+                                this.SetText(result.Replace('\n', ' '), true);
+                        }
+                    };
+                }
                 this.OnTextInput += (element, key, character) => {
                     if (!this.IsSelected || this.IsHidden)
                         return;
@@ -68,19 +82,11 @@ namespace MLEM.Ui.Elements {
                         this.InsertText(character);
                     }
                 };
-            } else {
-                this.OnPressed += async e => {
-                    if (!KeyboardInput.IsVisible) {
-                        var title = this.MobileTitle ?? this.PlaceholderText;
-                        var result = await KeyboardInput.Show(title, this.MobileDescription, this.Text);
-                        if (result != null)
-                            this.SetText(result.Replace('\n', ' '), true);
-                    }
-                };
-            }
                 this.OnDeselected += e => this.CaretPos = 0;
                 this.OnSelected += e => this.CaretPos = this.text.Length;
             }
+            base.ForceUpdateArea();
+        }
 
         private void HandleTextChange(bool textChanged = true) {
             // not initialized yet

MLEM.Ui/UiControls.cs

@@ -36,7 +36,7 @@ namespace MLEM.Ui {
 
         public UiControls(UiSystem system, InputHandler inputHandler = null) {
             this.System = system;
-            this.Input = inputHandler ?? new InputHandler();
+            this.Input = inputHandler ?? new InputHandler(system.Game);
             this.IsInputOurs = inputHandler == null;
 
             // enable all required gestures

MLEM.Ui/UiSystem.cs

@@ -67,21 +67,21 @@ namespace MLEM.Ui {
         public RootCallback OnRootAdded;
         public RootCallback OnRootRemoved;
 
-        public UiSystem(GameWindow window, GraphicsDevice device, UiStyle style, InputHandler inputHandler = null) : base(null) {
+        public UiSystem(Game game, GraphicsDevice device, UiStyle style, InputHandler inputHandler = null) : base(game) {
             this.Controls = new UiControls(this, inputHandler);
             this.GraphicsDevice = device;
-            this.Window = window;
+            this.Window = game.Window;
             this.style = style;
             this.Viewport = device.Viewport.Bounds;
             this.AutoScaleReferenceSize = this.Viewport.Size;
 
-            window.ClientSizeChanged += (sender, args) => {
+            game.Window.ClientSizeChanged += (sender, args) => {
                 this.Viewport = device.Viewport.Bounds;
                 foreach (var root in this.rootElements)
                     root.Element.ForceUpdateArea();
             };
 
-            window.AddTextInputListener((sender, key, character) => this.ApplyToAll(e => e.OnTextInput?.Invoke(e, key, character)));
+            this.Controls.Input.OnTextInput += (key, character) => this.ApplyToAll(e => e.OnTextInput?.Invoke(e, key, character));
             this.OnMousedElementChanged = e => this.ApplyToAll(t => t.OnMousedElementChanged?.Invoke(t, e));
             this.OnSelectedElementChanged = e => this.ApplyToAll(t => t.OnSelectedElementChanged?.Invoke(t, e));
             this.OnSelectedElementDrawn = (element, time, batch, alpha) => {

MLEM/Extensions/WindowExtensions.cs

@@ -1,33 +0,0 @@
-using System;
-using System.Reflection;
-using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Input;
-
-namespace MLEM.Extensions {
-    public static class WindowExtensions {
-
-        private static readonly bool TextInputSupported = typeof(GameWindow).GetEvent("TextInput") != null;
-
-        public static bool AddTextInputListener(this GameWindow window, TextInputCallback callback) {
-            if (!SupportsTextInput())
-                return false;
-            TextInputAdder.Add(window, callback);
-            return true;
-        }
-
-        public static bool SupportsTextInput() {
-            return TextInputSupported;
-        }
-
-        public delegate void TextInputCallback(object sender, Keys key, char character);
-
-        private static class TextInputAdder {
-
-            public static void Add(GameWindow window, TextInputCallback callback) {
-                window.TextInput += (sender, args) => callback(sender, args.Key, args.Character);
-            }
-
-        }
-
-    }
-}

MLEM/Input/InputHandler.cs

@@ -16,6 +16,16 @@ namespace MLEM.Input {
         public Keys[] PressedKeys { get; private set; }
         public bool HandleKeyboard;
 
+        private TextInputStyle textInputStyle;
+        public TextInputStyle TextInputStyle {
+            get => this.textInputStyle;
+            set {
+                this.textInputStyle = value;
+                value?.Initialize(this);
+            }
+        }
+        public Action<Keys, char> OnTextInput;
+
         public MouseState LastMouseState { get; private set; }
         public MouseState MouseState { get; private set; }
         public Point MousePosition => this.MouseState.Position;
@@ -50,11 +60,12 @@ namespace MLEM.Input {
         private readonly bool[] triggerGamepadButtonRepeat = new bool[GamePad.MaximumGamePadCount];
         private readonly Buttons?[] heldGamepadButtons = new Buttons?[GamePad.MaximumGamePadCount];
 
-        public InputHandler(bool handleKeyboard = true, bool handleMouse = true, bool handleGamepads = true, bool handleTouch = true) : base(null) {
+        public InputHandler(Game game, bool handleKeyboard = true, bool handleMouse = true, bool handleGamepads = true, bool handleTouch = true, TextInputStyle textInputStyle = null) : base(game) {
             this.HandleKeyboard = handleKeyboard;
             this.HandleMouse = handleMouse;
             this.HandleGamepads = handleGamepads;
             this.HandleTouch = handleTouch;
+            this.TextInputStyle = textInputStyle;
             this.Gestures = this.gestures.AsReadOnly();
         }
 
@@ -96,6 +107,9 @@ namespace MLEM.Input {
                 }
             }
 
+            if (this.TextInputStyle != null)
+                this.TextInputStyle.Update();
+
             if (this.HandleMouse) {
                 this.LastMouseState = this.MouseState;
                 this.MouseState = Mouse.GetState();

MLEM/Input/TextInputStyle.cs

@@ -0,0 +1,160 @@
+using System;
+using System.Linq;
+using System.Reflection;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Input;
+
+namespace MLEM.Input {
+    public abstract class TextInputStyle {
+
+        private InputHandler handler;
+
+        public abstract bool RequiresOnScreenKeyboard();
+
+        public abstract void Update();
+
+        public virtual void Initialize(InputHandler handler) {
+            this.handler = handler;
+        }
+
+        public class DesktopGl : TextInputStyle {
+
+            private static readonly EventInfo TextInput = typeof(GameWindow).GetEvent("TextInput");
+            private static readonly MethodInfo Callback = typeof(DesktopGl).GetMethod(nameof(OnTextInput));
+            private static PropertyInfo key;
+            private static PropertyInfo character;
+
+            public override bool RequiresOnScreenKeyboard() {
+                return false;
+            }
+
+            public override void Update() {
+            }
+
+            public override void Initialize(InputHandler handler) {
+                base.Initialize(handler);
+                if (TextInput != null)
+                    TextInput.AddEventHandler(handler.Game.Window, Delegate.CreateDelegate(TextInput.EventHandlerType, this, Callback));
+            }
+
+            public void OnTextInput(object sender, EventArgs args) {
+                if (key == null)
+                    key = args.GetType().GetProperty("Key");
+                if (character == null)
+                    character = args.GetType().GetProperty("Character");
+                this.handler.OnTextInput?.Invoke((Keys) key.GetValue(args), (char) character.GetValue(args));
+            }
+
+        }
+
+        public class Mobile : TextInputStyle {
+
+            public override bool RequiresOnScreenKeyboard() {
+                return true;
+            }
+
+            public override void Update() {
+            }
+
+        }
+
+        public class American : TextInputStyle {
+
+            public override bool RequiresOnScreenKeyboard() {
+                return false;
+            }
+
+            public override void Update() {
+                var pressed = this.handler.KeyboardState.GetPressedKeys().Except(this.handler.LastKeyboardState.GetPressedKeys());
+                var shift = this.handler.IsModifierKeyDown(ModifierKey.Shift);
+                foreach (var key in pressed) {
+                    var c = GetChar(key, shift);
+                    if (c.HasValue)
+                        this.handler.OnTextInput?.Invoke(key, c.Value);
+                }
+            }
+
+            private static char? GetChar(Keys key, bool shift) {
+                if (key == Keys.A) return shift ? 'A' : 'a';
+                if (key == Keys.B) return shift ? 'B' : 'b';
+                if (key == Keys.C) return shift ? 'C' : 'c';
+                if (key == Keys.D) return shift ? 'D' : 'd';
+                if (key == Keys.E) return shift ? 'E' : 'e';
+                if (key == Keys.F) return shift ? 'F' : 'f';
+                if (key == Keys.G) return shift ? 'G' : 'g';
+                if (key == Keys.H) return shift ? 'H' : 'h';
+                if (key == Keys.I) return shift ? 'I' : 'i';
+                if (key == Keys.J) return shift ? 'J' : 'j';
+                if (key == Keys.K) return shift ? 'K' : 'k';
+                if (key == Keys.L) return shift ? 'L' : 'l';
+                if (key == Keys.M) return shift ? 'M' : 'm';
+                if (key == Keys.N) return shift ? 'N' : 'n';
+                if (key == Keys.O) return shift ? 'O' : 'o';
+                if (key == Keys.P) return shift ? 'P' : 'p';
+                if (key == Keys.Q) return shift ? 'Q' : 'q';
+                if (key == Keys.R) return shift ? 'R' : 'r';
+                if (key == Keys.S) return shift ? 'S' : 's';
+                if (key == Keys.T) return shift ? 'T' : 't';
+                if (key == Keys.U) return shift ? 'U' : 'u';
+                if (key == Keys.V) return shift ? 'V' : 'v';
+                if (key == Keys.W) return shift ? 'W' : 'w';
+                if (key == Keys.X) return shift ? 'X' : 'x';
+                if (key == Keys.Y) return shift ? 'Y' : 'y';
+                if (key == Keys.Z) return shift ? 'Z' : 'z';
+                if (key == Keys.D0 && !shift || key == Keys.NumPad0) return '0';
+                if (key == Keys.D1 && !shift || key == Keys.NumPad1) return '1';
+                if (key == Keys.D2 && !shift || key == Keys.NumPad2) return '2';
+                if (key == Keys.D3 && !shift || key == Keys.NumPad3) return '3';
+                if (key == Keys.D4 && !shift || key == Keys.NumPad4) return '4';
+                if (key == Keys.D5 && !shift || key == Keys.NumPad5) return '5';
+                if (key == Keys.D6 && !shift || key == Keys.NumPad6) return '6';
+                if (key == Keys.D7 && !shift || key == Keys.NumPad7) return '7';
+                if (key == Keys.D8 && !shift || key == Keys.NumPad8) return '8';
+                if (key == Keys.D9 && !shift || key == Keys.NumPad9) return '9';
+                if (key == Keys.D0 && shift) return ')';
+                if (key == Keys.D1 && shift) return '!';
+                if (key == Keys.D2 && shift) return '@';
+                if (key == Keys.D3 && shift) return '#';
+                if (key == Keys.D4 && shift) return '$';
+                if (key == Keys.D5 && shift) return '%';
+                if (key == Keys.D6 && shift) return '^';
+                if (key == Keys.D7 && shift) return '&';
+                if (key == Keys.D8 && shift) return '*';
+                if (key == Keys.D9 && shift) return '(';
+                if (key == Keys.Space) return ' ';
+                if (key == Keys.Tab) return '\t';
+                if (key == Keys.Add) return '+';
+                if (key == Keys.Decimal) return '.';
+                if (key == Keys.Divide) return '/';
+                if (key == Keys.Multiply) return '*';
+                if (key == Keys.OemBackslash) return '\\';
+                if (key == Keys.OemComma && !shift) return ',';
+                if (key == Keys.OemComma && shift) return '<';
+                if (key == Keys.OemOpenBrackets && !shift) return '[';
+                if (key == Keys.OemOpenBrackets && shift) return '{';
+                if (key == Keys.OemCloseBrackets && !shift) return ']';
+                if (key == Keys.OemCloseBrackets && shift) return '}';
+                if (key == Keys.OemPeriod && !shift) return '.';
+                if (key == Keys.OemPeriod && shift) return '>';
+                if (key == Keys.OemPipe && !shift) return '\\';
+                if (key == Keys.OemPipe && shift) return '|';
+                if (key == Keys.OemPlus && !shift) return '=';
+                if (key == Keys.OemPlus && shift) return '+';
+                if (key == Keys.OemMinus && !shift) return '-';
+                if (key == Keys.OemMinus && shift) return '_';
+                if (key == Keys.OemQuestion && !shift) return '/';
+                if (key == Keys.OemQuestion && shift) return '?';
+                if (key == Keys.OemQuotes && !shift) return '\'';
+                if (key == Keys.OemQuotes && shift) return '"';
+                if (key == Keys.OemSemicolon && !shift) return ';';
+                if (key == Keys.OemSemicolon && shift) return ':';
+                if (key == Keys.OemTilde && !shift) return '`';
+                if (key == Keys.OemTilde && shift) return '~';
+                if (key == Keys.Subtract) return '-';
+                return null;
+            }
+
+        }
+
+    }
+}