feat(scroll_area, base_level): 添加 scroll_area

当 TableCloth 过长时，将鼠标放在 ScrollArea 会让 TableCloth 向左或向右
滚动。

levels/base_level/base_level.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=15 format=3 uid="uid://cother2aiigge"]
+[gd_scene load_steps=16 format=3 uid="uid://cother2aiigge"]
 
 [ext_resource type="Script" path="res://levels/base_level/base_level.gd" id="1_diojb"]
 [ext_resource type="PackedScene" uid="uid://bepyyenjtc0p3" path="res://levels/chapter_menu/level_menu/level_button/level_button.tscn" id="2_0egdl"]
@@ -12,6 +12,7 @@
 [ext_resource type="Texture2D" uid="uid://cuyseoi8y3567" path="res://objects/styled_button/replay1.png" id="7_xfna7"]
 [ext_resource type="Texture2D" uid="uid://dhjiokm51casd" path="res://objects/styled_button/replay2.png" id="8_60asn"]
 [ext_resource type="Texture2D" uid="uid://btyxqeveaeh6h" path="res://objects/styled_button/replay3.png" id="9_gpaci"]
+[ext_resource type="PackedScene" uid="uid://csl5lwjicxroy" path="res://levels/base_level/scroll_area/scroll_area.tscn" id="11_jgqxp"]
 
 [sub_resource type="SpriteFrames" id="SpriteFrames_yulkh"]
 animations = [{
@@ -81,6 +82,13 @@ sprite_frames = SubResource("SpriteFrames_5hm0m")
 animation = &"replay"
 centered = false
 
+[node name="ScrollLeftArea" parent="HUDs" instance=ExtResource("11_jgqxp")]
+position = Vector2(32, 135)
+
+[node name="ScrollRightArea" parent="HUDs" instance=ExtResource("11_jgqxp")]
+position = Vector2(448, 135)
+is_on_left = false
+
 [node name="Cards" type="Node" parent="."]
 
 [node name="Blocks" type="Node" parent="."]

levels/base_level/scroll_area/scroll_area.gd

@@ -0,0 +1,41 @@
+extends Area2D
+
+
+const WIDTH := 1920 / 4
+const PADDING := 32
+const SPEED := 300
+
+
+@export var is_on_left := true
+
+var is_mouse_on = false
+
+
+
+func _process(delta: float):
+	if self.is_mouse_on:
+		if get_tree().root.has_node("BaseLevel/HUDs/TableCloth"):
+			var table_cloth_node = get_tree().root.get_node("BaseLevel/HUDs/TableCloth")
+			var offset := 0
+
+			if table_cloth_node.size.x < WIDTH:
+				return
+
+			if self.is_on_left and table_cloth_node.position.x < PADDING:
+				offset = min(PADDING - table_cloth_node.position.x, int(delta * SPEED + 0.5))
+			elif not self.is_on_left and table_cloth_node.position.x + table_cloth_node.size.x > WIDTH - PADDING:
+				offset = -min(table_cloth_node.position.x + table_cloth_node.size.x - (WIDTH - PADDING), int(delta * SPEED + 0.5))
+
+			if offset != 0:
+				table_cloth_node.position.x += offset
+				for block: Block in get_tree().root.get_node("BaseLevel/Blocks").get_children():
+					block.position.x += offset
+					if block.occupied_card != null:
+						block.occupied_card.position.x += offset
+
+
+func _on_mouse_exited():
+	self.is_mouse_on = false
+
+func _on_mouse_entered():
+	self.is_mouse_on = true

levels/base_level/scroll_area/scroll_area.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=3 format=3 uid="uid://csl5lwjicxroy"]
+
+[ext_resource type="Script" path="res://levels/base_level/scroll_area/scroll_area.gd" id="1_j4m6q"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_dbovb"]
+size = Vector2(64, 200)
+
+[node name="ScrollArea" type="Area2D"]
+script = ExtResource("1_j4m6q")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource("RectangleShape2D_dbovb")
+debug_color = Color(0, 0.6, 0.701961, 0.419608)
+
+[connection signal="mouse_entered" from="." to="." method="_on_mouse_entered"]
+[connection signal="mouse_exited" from="." to="." method="_on_mouse_exited"]