extends VBoxContainer

## 外轮廓线凸显shader材质
@export var outline_material: ShaderMaterial

## 鼠标进入范围外轮廓线颜色
static var  ENTERED_COLOR = Vector4(0, 1.0, 1.0, 0.5)
## 聚焦时外轮廓线颜色
static var FOCUS_COLOR = Vector4(0, 1.0, 1.0, 1)

signal on_focus

var focus: bool = false

## 鼠标进入检测范围
func _on_area_2d_mouse_entered():
	if not focus:
		outline_material.set_shader_parameter("color", ENTERED_COLOR)
		%Key.material = outline_material

## 鼠标离开检测范围
func _on_area_2d_mouse_exited():
	if not focus:
		%Key.material = null

func _on_focus_entered():
	focus = true
	on_focus.emit(self)
	outline_material.set_shader_parameter("color", FOCUS_COLOR)
	%Key.material = outline_material


func _on_focus_exited():
	focus = false
	%Key.material = null

func hide_key():
	%Key.modulate.a = 0

func show_key():
	%Key.modulate.a = 255