Add custom editor for buttons that allow listening for them inside the editor.

Source/Editor/CustomEditors/Editors/BindableButtonEditor.cs

@@ -0,0 +1,96 @@
+using FlaxEditor.GUI;
+using FlaxEngine;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.CustomEditors.Editors
+{
+    /// <summary>
+    /// Base class for custom button editors.
+    /// See <seealso cref="MouseButtonEditor"/>, <seealso cref="KeyboardKeysEditor"/> and <seealso cref="GamepadButtonEditor"/>.
+    /// </summary>
+    public class BindableButtonEditor : EnumEditor
+    {
+        private bool _isListeningForInput;
+        private Button _button;
+
+        /// <summary>
+        /// Where or not we are currently listening for any input.
+        /// </summary>
+        protected bool IsListeningForInput
+        {
+            get => _isListeningForInput;
+            set
+            {
+                _isListeningForInput = value;
+                if (_isListeningForInput)
+                    SetupButton();
+                else
+                    ResetButton();
+            }
+        }
+
+        /// <summary>
+        /// The window this editor is attached to.
+        /// Useful to hook into for key pressed, mouse buttons etc.
+        /// </summary>
+        protected Window Window { get; private set; }
+
+        /// <inheritdoc />
+        public override void Initialize(LayoutElementsContainer layout)
+        {
+            Window = layout.Control.RootWindow.Window;
+
+            var panel = layout.CustomContainer<UniformGridPanel>();
+            panel.CustomControl.SlotsHorizontally = 2;
+            panel.CustomControl.SlotsVertically = 1;
+
+            var button = panel.Button("Listen");
+            _button = button.Button;
+            _button.Clicked += OnButtonClicked;
+            ResetButton();
+
+            var padding = panel.CustomControl.SlotPadding;
+            panel.CustomControl.Height = ComboBox.DefaultHeight + padding.Height;
+
+            base.Initialize(panel);
+        }
+
+        /// <inheritdoc />
+        protected override void Deinitialize()
+        {
+            _button.Clicked -= OnButtonClicked;
+            base.Deinitialize();
+        }
+
+        private void ResetButton()
+        {
+            _button.Text = "Listen";
+            _button.BorderThickness = 1;
+
+            var style = FlaxEngine.GUI.Style.Current;
+            _button.BorderColor = style.BorderNormal;
+            _button.BorderColorHighlighted = style.BorderHighlighted;
+            _button.BorderColorSelected = style.BorderSelected;
+        }
+
+        private void SetupButton()
+        {
+            _button.Text = "Listening...";
+            _button.BorderThickness = 2;
+
+            var color = FlaxEngine.GUI.Style.Current.ProgressNormal;
+            _button.BorderColor = color;
+            _button.BorderColorHighlighted = color;
+            _button.BorderColorSelected = color;
+        }
+
+        private void OnButtonClicked()
+        {
+            _isListeningForInput = !_isListeningForInput;
+            if (_isListeningForInput)
+                SetupButton();
+            else
+                ResetButton();
+        }
+    }
+}