koperkapel/scenes/menu.py

   1 """ Main menu scene. """
   2
   3 from pgzero.constants import keys
   4 from pgzero.loaders import images
   5 from ..actors.navigator import ActorNavigator
   6 from ..actors.orientatedsurf import OrientatedSurfActor, SelectableSurfActor
   7 from ..util import safepath
   8 from .base import Scene, ChangeSceneEvent, WorldEvent, QuitEvent
   9
  10
  11 class MenuScene(Scene):
  12     """ Main menu scene. """
  13
  14     def __init__(self):
  15         super().__init__()
  16         self.actors.add_layer("buttons", level=10)
  17         self._init_bg()
  18         self._init_buttons()
  19
  20     def _init_bg(self):
  21         self.actors.default.clear()
  22         self.actors.default.add(OrientatedSurfActor(
  23             images.load(safepath("splash/background"))))
  24
  25     def _init_buttons(self):
  26         self._nav = ActorNavigator()
  27         menu = [
  28             self._build_button("new_game", action=self.change_to_new_game),
  29             self._build_button("resume_game", action=self.change_to_resume),
  30             self._build_button("credits", action=self.change_to_credits),
  31             self._build_button("quit", action=self.quit),
  32         ]
  33         for i, item in enumerate(menu):
  34             item.pos = (675, 275 + (i * 100))
  35             self.actors.add(item)
  36         self._nav.connect(
  37             menu, [keys.DOWN, keys.RIGHT], [keys.UP, keys.LEFT],
  38             wrap=True)
  39         self._nav.current.selected = True
  40
  41     def _build_button(self, name, action):
  42         actor = SelectableSurfActor(
  43             images.load(safepath("splash/%s" % (name,))),
  44             images.load(safepath("splash/%s_selected" % (name,))))
  45         actor.action = action
  46         return actor
  47
  48     def change_to_resume(self):
  49         from .level import GameLevelScene
  50         return [ChangeSceneEvent(GameLevelScene())]
  51
  52     def change_to_new_game(self):
  53         from .level import GameLevelScene
  54         return [
  55             WorldEvent("reset"),
  56             ChangeSceneEvent(GameLevelScene())
  57         ]
  58
  59     def change_to_credits(self):
  60         from .credits import CreditsScene
  61         return [ChangeSceneEvent(CreditsScene())]
  62
  63     def quit(self):
  64         return [QuitEvent()]
  65
  66     def on_key_down(self, key, mod, unicode):
  67         if key == keys.RETURN:
  68             current = self._nav.current
  69             if current is not None:
  70                 return current.action()
  71         else:
  72             prev, current = self._nav.follow(key)
  73             if prev is not None:
  74                 prev.selected = False
  75             if current is not None:
  76                 current.selected = True