half-earth/nodes/game.tscn

@@ -51,6 +51,7 @@ _buildModePath = NodePath("../../Interaction Modes/Build Mode")
 [connection signal="OnModeEntered" from="Interaction Modes/Build Mode" to="Interaction Modes" method="_on_Build_Mode_OnModeEntered"]
 [connection signal="OnModeEntered" from="Interaction Modes/Build Mode" to="UI/Mode Selection" method="EnableBuildMode"]
 [connection signal="OnModeExited" from="Interaction Modes/Build Mode" to="Interaction Modes" method="_on_Build_Mode_OnModeExited"]
+[connection signal="SelectedTileTypeChanged" from="Interaction Modes/Build Mode" to="UI/Build Mode" method="UpdateButtonToggleState"]
 [connection signal="OnExit" from="UI/Build Mode" to="Interaction Modes" method="Reset"]
 [connection signal="OnExit" from="UI/Build Mode" to="UI/Mode Selection" method="Enable"]
 [connection signal="BuildModeEnabled" from="UI/Mode Selection" to="Interaction Modes/Build Mode" method="Enable"]

half-earth/resources/tile_types/developed.tres

@@ -5,5 +5,6 @@
 [resource]
 script = ExtResource( 1 )
 Name = "Developed"
+BuildLabel = "[D]eveloped"
 Key = 68
 Color = Color( 0.372549, 0.372549, 0.372549, 1 )

half-earth/scripts/GridCursor.cs

@@ -46,24 +46,6 @@ public class GridCursor : Sprite
             this.Position = position;
             return;
         }
-
-        //if (@event is InputEventMouseButton mouseButtonEvent)
-        //{
-        //    var button = (ButtonList)mouseButtonEvent.ButtonIndex;
-        //    if (button != ButtonList.Left)
-        //        return;
-
-        //    if (!mouseButtonEvent.Pressed)
-        //    {
-        //        _material.SetShaderParam(T, 0f);
-        //        return;
-        //    }
-
-        //    var pos = mouseButtonEvent.Position;
-        //    _grid.GetGridPos(pos, out var x, out var y);
-        //    _grid.SetTileValue(x, y, 1.0f);
-        //    _material.SetShaderParam(T, 1f);
-        //}
     }
 
     public override void _Process(float delta)

half-earth/scripts/TileType.cs

@@ -5,6 +5,9 @@ public class TileType : Resource
     [Export]
     public string Name { get; private set; }
 
+    [Export]
+    public string BuildLabel { get; private set; }
+
     [Export]
     public KeyList Key { get; private set; }
 

half-earth/scripts/interaction_modes/BuildMode.cs

@@ -3,6 +3,9 @@ using System;
 
 public class BuildMode : Mode
 {
+    [Signal]
+    delegate void SelectedTileTypeChanged();
+
     [Export]
     private NodePath _gridPath;
     private WorldGrid _grid;
@@ -33,6 +36,7 @@ public class BuildMode : Mode
             }
 
             _selectedTileType = value;
+            EmitSignal(nameof(SelectedTileTypeChanged), _selectedTileType);
         }
     }
     private TileType _selectedTileType = null;

half-earth/scripts/ui/BuildModeUI.cs

@@ -1,5 +1,6 @@
 using Godot;
 using System;
+using System.Collections.Generic;
 
 public class BuildModeUI : Control
 {
@@ -10,6 +11,9 @@ public class BuildModeUI : Control
     private NodePath _buildModePath;
     private BuildMode _buildMode;
 
+    private readonly Dictionary<TileType, Button> _typeButtons
+        = new Dictionary<TileType, Button>();
+
     // Called when the node enters the scene tree for the first time.
     public override void _Ready()
     {
@@ -22,6 +26,15 @@ public class BuildModeUI : Control
         SpawnButton(tileType, buttonHeight, ref x);
     }
 
+    private void UpdateButtonToggleState(TileType tileType)
+    {
+        foreach (var kvp in _typeButtons)
+        {
+            var button = _typeButtons[kvp.Key];
+            button.SetPressedNoSignal(kvp.Key == tileType);
+        }
+    }
+
     private void SpawnButton(TileType tileType, int buttonHeight, ref int x)
     {
         const int MARGIN = 5;
@@ -29,8 +42,8 @@ public class BuildModeUI : Control
         var button = new Button();
         this.AddChild(button);
 
-        button.Text = tileType.Name;
+        button.Text = tileType.BuildLabel;
-        var parameters = new Godot.Collections.Array(tileType);
+        var parameters = new Godot.Collections.Array(button, tileType);
         button.Connect("pressed", this, nameof(SelectTileType), parameters);
 
         button.SetAnchorsPreset(LayoutPreset.BottomLeft);
@@ -39,13 +52,19 @@ public class BuildModeUI : Control
         var size = button.RectSize;
         button.RectSize = new Vector2(size.x, buttonHeight);
 
+        button.ToggleMode = true;
+
         button.SetPosition(new Vector2(x, -buttonHeight));
         x += Mathf.RoundToInt(size.x) + MARGIN;
+
+        _typeButtons[tileType] = button;
     }
 
-    private void SelectTileType(TileType tileType)
+    private void SelectTileType(Button button, TileType tileType)
     {
-        _buildMode.SelectedTileType = tileType;
+        _buildMode.SelectedTileType = button.Pressed
+            ? tileType
+            : null;
     }
 
     public void Exit()