Command (Windows) key is now supported as modifier key for dragging.

color.go

@@ -11,6 +11,14 @@ var Transparent = sdl.Color{R: 0, G: 0, B: 0, A: 0}
 var TransparentWhite = sdl.Color{R: 255, G: 255, B: 255, A: 31}
 var White = sdl.Color{R: 255, G: 255, B: 255, A: 255}
 
+func HexColor(s string) (sdl.Color, error) {
+	c, err := img.HexColor(s)
+	if err != nil {
+		return sdl.Color{}, err
+	}
+	return sdl.Color(c), nil
+}
+
 func MustHexColor(s string) sdl.Color { return sdl.Color(img.MustHexColor(s)) }
 
 func SetDrawColor(renderer *sdl.Renderer, color sdl.Color) {

control.go

@@ -22,6 +22,7 @@ func EmptyEvent(fn EventFn) EventContextFn {
 type ControlBase struct {
 	Bounds Rectangle
 
+	IsDisabled  bool
 	IsMouseOver bool
 
 	OnLeftMouseButtonClick EventContextFn
@@ -36,7 +37,7 @@ func (b *ControlBase) Handle(ctx *Context, event sdl.Event) bool {
 	case *sdl.MouseMotionEvent:
 		b.IsMouseOver = b.Bounds.IsPointInside(e.X, e.Y)
 	case *sdl.MouseButtonEvent:
-		if b.IsMouseOver && e.Button == sdl.BUTTON_LEFT && e.Type == sdl.MOUSEBUTTONDOWN {
+		if !b.IsDisabled && b.IsMouseOver && e.Button == sdl.BUTTON_LEFT && e.Type == sdl.MOUSEBUTTONDOWN {
 			return b.Invoke(ctx, b.OnLeftMouseButtonClick)
 		}
 	case *sdl.WindowEvent:

gamecontrols.go

@@ -120,7 +120,10 @@ func (c *GameControls) Init(ctx *Context) error {
 
 	c.menu.Background = MustHexColor("#356dad")
 	c.menu.Buttons = []Control{
-		NewIconButton("control-settings", c.dialogs.ShowSettings),
+		NewIconButtonConfig("control-settings", c.dialogs.ShowSettings, func(b *IconButton) {
+			b.IsDisabled = true
+			b.IconDisabled = "#afafaf"
+		}),
 		NewIconButton("control-save", func(*Context) { c.game.Save() }),
 		NewIconButton("control-load", func(ctx *Context) {
 			c.game.Load()

iconbutton.go

@@ -20,7 +20,6 @@ type IconButton struct {
 	IconHover  HoverEffect
 
 	IsActive bool
-	IsDisabled bool
 }
 
 func NewIconButton(icon string, onClick EventContextFn) *IconButton {
@@ -44,6 +43,16 @@ func (b *IconButton) activeTexture(ctx *Context) *Texture {
 		if texture != nil {
 			return texture
 		}
+
+		texture = ctx.Textures.Texture(b.Icon)
+		if len(b.IconDisabled) == 0 {
+			return texture
+		}
+		color, err := HexColor(b.IconDisabled)
+		if err == nil {
+			texture.SetColor(color)
+		}
+		return texture
 	}
 	return ctx.Textures.Texture(b.Icon)
 }

terrainrenderer.go

@@ -34,7 +34,7 @@ func (r *terrainRenderer) Init(ctx *Context) error {
 
 func isControlKeyDown() bool {
 	state := sdl.GetKeyboardState()
-	return state[sdl.SCANCODE_LCTRL] == 1 || state[sdl.SCANCODE_RCTRL] == 1
+	return state[sdl.SCANCODE_LCTRL] == 1 || state[sdl.SCANCODE_RCTRL] == 1 || state[sdl.SCANCODE_LGUI] == 1 || state[sdl.SCANCODE_RGUI] == 1
 }
 
 func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) bool {