ux stuff

common/elements/v1/element.go

@@ -0,0 +1,42 @@
+package elements
+
+import (
+	"context"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type MouseState struct {
+	X, Y                int32
+	LeftDown, RightDown bool
+}
+
+const (
+	ParentKey = "parent_element"
+	ZeroKey   = "zero"
+)
+
+type Mouseable interface {
+	HandleMouseMove(ctx context.Context, s MouseState) error
+	HandleMouseDown(ctx context.Context, s MouseState) error
+	HandleMouseUp(ctx context.Context, s MouseState) error
+}
+
+type Element interface {
+	Draw(ctx context.Context, image *ebiten.Image) error
+	Size() (w, h int32)
+}
+
+func GetZero(ctx context.Context) (x, y int32) {
+	if v, ok := ctx.Value(ZeroKey).([2]int32); ok {
+		return v[0], v[1]
+	}
+	return 0, 0
+}
+
+func GetParent(ctx context.Context) Element {
+	if e, ok := ctx.Value(ParentKey).(Element); ok {
+		return e
+	}
+	return nil
+}