feat(ui): implement new ui system

game/ui/layouts/list_box.go

@@ -0,0 +1,84 @@
+package layouts
+
+import (
+	"tetris/game/ui"
+	"tetris/game/ui/base"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+type OnSelectCallback func()
+
+type ListBox struct {
+	*base.WithFocus
+	selected int
+	entries  []ui.InputWidget
+	onSelect OnSelectCallback
+	spacing  int
+}
+
+func NewListBox(entries []ui.InputWidget) *ListBox {
+	lb := &ListBox{
+		WithFocus: &base.WithFocus{},
+		entries:   entries,
+		onSelect:  func() {},
+	}
+	lb.entries[0].SetFocus(true)
+	return lb
+}
+
+func (lb *ListBox) Spacing(value int) *ListBox {
+	lb.spacing = value
+	return lb
+}
+
+func (lb *ListBox) OnSelect(callback OnSelectCallback) *ListBox {
+	lb.onSelect = callback
+	return lb
+}
+
+func (lb ListBox) Entries() []ui.InputWidget {
+	return lb.entries
+}
+
+func (lb *ListBox) Select(index int) {
+	if index >= 0 && index < len(lb.entries) {
+		lb.entries[lb.selected].SetFocus(false)
+		lb.selected = index
+		lb.entries[lb.selected].SetFocus(true)
+		lb.onSelect()
+	}
+}
+
+func (lb ListBox) Selected() ui.InputWidget {
+	return lb.entries[lb.selected]
+}
+
+func (lb ListBox) IsSelected(index int) bool {
+	return lb.selected == index
+}
+
+func (lb *ListBox) Next() {
+	lb.Select(lb.selected + 1)
+}
+
+func (lb *ListBox) Previous() {
+	lb.Select(lb.selected - 1)
+}
+
+func (lb *ListBox) HandleInput() {
+	if rl.IsKeyPressed(rl.KeyDown) {
+		lb.Next()
+	} else if rl.IsKeyPressed(rl.KeyUp) {
+		lb.Previous()
+	} else {
+		lb.Selected().HandleInput()
+	}
+}
+
+func (lb *ListBox) Draw(x, y int32) {
+	for _, ent := range lb.entries {
+		ent.Draw(x, y)
+		y += int32(ent.Size().Y + lb.spacing)
+	}
+}