Show tooltips when hovering

internal/ui/interface.go

@@ -6,6 +6,7 @@ import (
 	"reflect" // For DeepEqual
 
 	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
 
 	"code.ur.gs/lupine/ordoor/internal/assetstore"
 	"code.ur.gs/lupine/ordoor/internal/menus"
@@ -93,6 +94,11 @@ func (i *Interface) Draw(screen *ebiten.Image) error {
 			return err
 		}
 		do.GeoM = geo
+
+		if widget.hoverState && widget.Tooltip != "" {
+			mouseX, mouseY := ebiten.CursorPosition()
+			ebitenutil.DebugPrintAt(screen, widget.Tooltip, mouseX+16, mouseY-16)
+		}
 	}
 
 	return nil
@@ -167,10 +173,11 @@ func (i *Interface) widgetFromRecord(record *menus.Record) (*Widget, error) {
 	}
 
 	widget := &Widget{
-		Bounds: sprite.Rect,
-		path:   path,
-		record: record,
-		sprite: sprite,
+		Bounds:  sprite.Rect,
+		Tooltip: record.Desc,
+		path:    path,
+		record:  record,
+		sprite:  sprite,
 	}
 
 	switch record.Type {

internal/ui/widget.go

@@ -13,8 +13,8 @@ import (
 // non-interactive areas are not widgets.
 type Widget struct {
 	// Position on the screen in original (i.e., unscaled) coordinates
-	Bounds image.Rectangle
-	// Tooltip string // TODO: show the tooltip when hovering?
+	Bounds  image.Rectangle
+	Tooltip string
 
 	OnHoverEnter func()
 	OnHoverLeave func()