Node2D.gd:

 1 extends Node2D
 2 
 3 var ball = preload("res://Area2D.tscn") 
 4 var prv
 5 onready var viewSize = get_viewport_rect().size
 6 
 7 class Sorter:
 8     static func sort(a, b):
 9         if a["collider"].get_index() > b["collider"].get_index():
10             return true
11         return false
12 
13 func _ready():    
14     randomize()
15     for i in 200:
16         new(i > 100)
17 
18 func _input(event):
19     if event is InputEventMouseButton:
20         match event.button_index:
21             BUTTON_LEFT:
22                 if event.is_pressed():
23                     #这里可以应用各种规则来提高效率,比如减少intersect_point检测数量,减少intersect_point触发次数
24                     var stime = OS.get_ticks_msec()
25                     var shapes = get_world_2d().direct_space_state.intersect_point(get_global_mouse_position(), 9999, [], 0x7fffffff, false, true)
26                     var size = shapes.size()
27                     if size > 0:
28                         if size > 1:
29                             shapes.sort_custom(Sorter, "sort")
30                         var etime = OS.get_ticks_msec() - stime
31                         print("检测耗时(毫秒)", etime)
32                         var collider = shapes[0]["collider"]
33                         if collider.has_method("_on_drag"):
34                             if collider.get_index() < collider.get_parent().get_child_count() - 1:
35                                 collider.raise()
36                                 print("置顶", collider.get_instance_id())
37                             prv = collider
38                             collider._on_drag(true)
39                     else:
40                         print("intersect_point zero")
41                 else:
42                     if prv:
43                         prv._on_drag(false)
44                         prv = null
45             BUTTON_RIGHT:
46                 if event.is_pressed():
47                     new(false)
48 
49 func new(rnd):
50     var node = ball.instance()
51     var size = node.get_node("Sprite").texture.get_size()
52     if rnd:
53         node.position = Vector2(rand_range(size.x * 4, viewSize.x - size.x), rand_range(size.y, viewSize.y - size.y))
54     else:
55         node.position = size
56     add_child(node)

Area2D.gd:

 1 extends Area2D
 2 
 3 var isDrag = false
 4 var offset
 5 onready var label = $Label
 6 onready var sprite = $Sprite
 7 onready var id = self.get_instance_id()
 8 
 9 func _ready():
10     label.text = str(id);
11     sprite.self_modulate = Color(randf(), randf(), randf(), 1)
12 
13 func _process(delta):
14     if isDrag:
15         self.position = get_global_mouse_position() + offset
16 
17 func _on_drag(state):
18     if state:
19         offset = self.position - get_global_mouse_position()
20         isDrag = true
21         print("开始拖动", id)
22     else:
23         if isDrag:
24             isDrag = false
25             print("结束拖动", id)
26 
27 #func _on_Area2D_input_event(viewport, event, shape_idx):
28 #    if isDrag:
29 #            if event is InputEventMouseButton and event.button_index == BUTTON_LEFT:
30 #                if not event.is_pressed():
31 #                    isDrag = false
32 #                    print("内部结束(实例id)", id)