├── DragDropController.gd
├── DragDropController.tscn
├── LICENSE.txt
├── README.md
├── icon.png
├── icon.png.import
└── project.godot


/DragDropController.gd:
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 1 | extends Node
 2 | 
 3 | var current = null
 4 | var drag_offset = Vector2()
 5 | 
 6 | var candidates = []
 7 | 
 8 | export var drag_group = "draggable"
 9 | 
10 | 
11 | func _ready():
12 | 	var draggables = get_tree().get_nodes_in_group(drag_group)
13 | 	for dragable in draggables:
14 | 		if dragable is CollisionObject2D:
15 | 			dragable.connect("mouse_entered",self,"mouse_entered",[dragable])
16 | 			dragable.connect("mouse_exited",self,"mouse_exited",[dragable])
17 | 			dragable.connect("input_event",self,"input_event",[dragable])
18 | 
19 | func _process(delta):
20 | 	if current is Node2D:
21 | 		current.global_position = current.get_global_mouse_position() - drag_offset
22 | 
23 | func mouse_entered(which):
24 | 	candidates.append(which)
25 | 	pass
26 | 
27 | func mouse_exited(which):
28 | 	candidates.erase(which)
29 | 	pass
30 | 
31 | func input_event(viewport: Node, event: InputEvent, shape_idx: int,which:Node2D):
32 | 	if event is InputEventMouseButton and event.button_index == BUTTON_LEFT:
33 | 		if event.is_pressed():
34 | 			candidates.sort_custom(self,"depth_sort")
35 | 			var last = candidates.back()
36 | 			if last:
37 | 				last.raise()
38 | 				current = last
39 | 				drag_offset = current.get_global_mouse_position() - current.global_position
40 | 				if current.has_method("on_drag_start"):
41 | 					current.on_drag_start()
42 | 		else:
43 | 			var can_drop = true
44 | 			if current:
45 | 				if current.has_method("on_drop"):
46 | 					var on_drop_result = current.on_drop()
47 | 					can_drop = on_drop_result == null || on_drop_result
48 | 				if can_drop:
49 | 					current = null
50 | 
51 | func depth_sort(a,b):
52 | 	return b.get_index()<a.get_index()
53 | 


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/DragDropController.tscn:
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1 | [gd_scene load_steps=2 format=2]
2 | 
3 | [ext_resource path="res://DragDropController.gd" type="Script" id=1]
4 | 
5 | [node name="DragDropController" type="Node"]
6 | script = ExtResource( 1 )
7 | 


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/LICENSE.txt:
--------------------------------------------------------------------------------
 1 |   
 2 | Copyright (c) 2019 Christian Baune.
 3 | 
 4 | Permission is hereby granted, free of charge, to any person obtaining a copy
 5 | of this software and associated documentation files (the "Software"), to deal
 6 | in the Software without restriction, including without limitation the rights
 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 8 | copies of the Software, and to permit persons to whom the Software is
 9 | furnished to do so, subject to the following conditions:
10 | 
11 | The above copyright notice and this permission notice shall be included in all
12 | copies or substantial portions of the Software.
13 | 
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 | SOFTWARE.
21 | 


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/README.md:
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 1 | # Use
 2 | 
 3 | 1. Add the `DragDropController` node in your scene.
 4 | 2. In the inspector, fill in Drag Group with the name of the group containing nodes you want to be draggable, by default, the group is named "draggable".
 5 | 3. (optional) In the node that can be dragged, you can create two methods : `on_drop` and `on_drag_start`
 6 | 
 7 | ## on_drop
 8 | 
 9 | Called when the node is dropped. 
10 | Return "false" to prevent drop.
11 | Do not return anything (no `return` in your function) or return `true` to allow drop.
12 | 
13 | Here is an example of implementation to check if you are dropping in a free space:
14 | 
15 | ```godot
16 | onready var previous_position = position
17 | func on_drop():
18 | 	position = position.snapped(Vector2(64,64))
19 | 	yield(get_tree(),"idle_frame")
20 | 	yield(get_tree(),"idle_frame")
21 | 	if get_overlapping_areas().size()>0:
22 | 		print("col!")
23 | 		position = previous_position
24 | 	else:
25 | 		print("no col")
26 | 		previous_position = position
27 | ```
28 | 
29 | ## on_drag_start
30 | 
31 | Called when the node begin to be dragged. (if multiple nodes are stacked, only the topmost node will be dragged)
32 | 


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/icon.png:
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https://raw.githubusercontent.com/programaths/dragdrop/620b2995b131d82359c039d27c862910be1dadba/icon.png


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/icon.png.import:
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 1 | [remap]
 2 | 
 3 | importer="texture"
 4 | type="StreamTexture"
 5 | path="res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex"
 6 | metadata={
 7 | "vram_texture": false
 8 | }
 9 | 
10 | [deps]
11 | 
12 | source_file="res://icon.png"
13 | dest_files=[ "res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex" ]
14 | 
15 | [params]
16 | 
17 | compress/mode=0
18 | compress/lossy_quality=0.7
19 | compress/hdr_mode=0
20 | compress/bptc_ldr=0
21 | compress/normal_map=0
22 | flags/repeat=0
23 | flags/filter=true
24 | flags/mipmaps=false
25 | flags/anisotropic=false
26 | flags/srgb=2
27 | process/fix_alpha_border=true
28 | process/premult_alpha=false
29 | process/HDR_as_SRGB=false
30 | process/invert_color=false
31 | stream=false
32 | size_limit=0
33 | detect_3d=true
34 | svg/scale=1.0
35 | 


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/project.godot:
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 1 | ; Engine configuration file.
 2 | ; It's best edited using the editor UI and not directly,
 3 | ; since the parameters that go here are not all obvious.
 4 | ;
 5 | ; Format:
 6 | ;   [section] ; section goes between []
 7 | ;   param=value ; assign values to parameters
 8 | 
 9 | config_version=4
10 | 
11 | _global_script_classes=[  ]
12 | _global_script_class_icons={
13 | 
14 | }
15 | 
16 | [application]
17 | 
18 | config/name="DragDrop"
19 | config/icon="res://icon.png"
20 | 


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