ScreamHome/sceneManager.lua at main · felipeViana/ScreamHome · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
local sceneManager = {}

local emptyFunc = function()
end

local screenStack = {}

function sceneManager._validateScene(s)
  s = s or {}

  s.load = s.load or emptyFunc
  s.unload = s.unload or emptyFunc
  s.update = s.update or emptyFunc
  s.draw = s.draw or emptyFunc
  s.resize = s.resize or emptyFunc
  s.keypressed = s.keypressed or emptyFunc
  s.textinput = s.textinput or emptyFunc
  s.mousepressed = s.mousepressed or emptyFunc

  s.name = s.name or nil
  s.comingBack = s.comingBack or emptyFunc
  return s
end

function sceneManager.changeScene(s, option)
  s = s or error("ChangeScene requires a Scene")

  for i = 1, #screenStack do
    screenStack[i].unload()
  end

  screenStack = {s}

  sceneManager.currentScene = sceneManager._validateScene(s)
  sceneManager.currentScene.load(option)
end

function sceneManager.pushScene(s, option)
  s = s or error("pushScene requires a scene")

  table.insert(screenStack, s)
  sceneManager.currentScene = sceneManager._validateScene(s)
  sceneManager.currentScene.load(option)
end

function sceneManager.popScene(load)
  if #screenStack < 2 then
    error("popScene requires at least one extra scene to go back to")
  end

  sceneManager.currentScene.unload()
  table.remove(screenStack, #screenStack)
  sceneManager.currentScene = screenStack[#screenStack]
  sceneManager.currentScene.comingBack()
  if load then
    sceneManager.currentScene.load()
  end
end

function sceneManager.getCurrentScene()
  return sceneManager.currentScene
end

function sceneManager.draw()
  for i = 1, #screenStack do
    print(screenStack[i].name)
    screenStack[i].draw()
  end
end

function sceneManager.resetScene()
  sceneManager.currentScene.unload()
  sceneManager.currentScene.load()
end

sceneManager.currentScene = sceneManager._validateScene(nil)
return sceneManager