Mercurial > skaapsteker
annotate skaapsteker/engine.py @ 79:fe8652a060df
Simple menu screen and TextChoice widget
| author | Stefano Rivera <stefano@rivera.za.net> |
|---|---|
| date | Mon, 04 Apr 2011 00:46:13 +0200 |
| parents | fb1bd081cc86 |
| children | 592477d8b09b |
| rev | line source |
|---|---|
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1 """Top-level engine for switching scenes.""" |
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2 |
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3 import pygame.display |
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4 import pygame.time |
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5 import pygame.event |
| 14 | 6 from pygame.locals import QUIT, USEREVENT |
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7 |
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8 class Engine(object): |
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9 |
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10 def __init__(self): |
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11 self._framerate = 60 |
| 14 | 12 self._current_scene = None |
| 13 | |
| 14 def change_scene(self, next_scene): | |
| 15 if self._current_scene is not None: | |
| 16 self._current_scene.leave() | |
| 17 self._current_scene = next_scene | |
| 18 self._current_scene.enter() | |
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parents:
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19 |
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20 def run(self): |
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21 """Run the game loop dispatching events as necessary.""" |
| 14 | 22 assert self._current_scene is not None |
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23 clock = pygame.time.Clock() |
| 14 | 24 surface = pygame.display.get_surface() |
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25 while True: |
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26 events = pygame.event.get() |
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27 for ev in events: |
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28 if ev.type is QUIT: |
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29 return |
| 14 | 30 if ChangeScene.matches(ev): |
| 31 self.change_scene(ev.next_scene) | |
| 32 break | |
| 33 self._current_scene.dispatch(ev) | |
| 34 self._current_scene.draw(surface) | |
| 35 pygame.display.flip() | |
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parents:
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36 clock.tick(self._framerate) |
| 14 | 37 |
| 38 | |
| 39 class Scene(object): | |
| 40 | |
| 41 def __init__(self): | |
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79
fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
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42 self.widgets = [] |
| 14 | 43 |
| 44 def post(self, ev): | |
| 45 """Post an event to pygame's event loop.""" | |
| 46 pygame.event.post(ev) | |
| 47 | |
| 48 def enter(self): | |
| 49 """Enter the scene.""" | |
| 50 pass | |
| 51 | |
| 52 def leave(self): | |
| 53 """Exit the scene.""" | |
| 54 pass | |
| 55 | |
| 56 def dispatch(self, ev): | |
| 57 """Dispatch an event.""" | |
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79
fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
14
diff
changeset
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58 for widget in self.widgets: |
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fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
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diff
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59 widget.dispatch(ev) |
| 14 | 60 |
| 61 def draw(self, surface): | |
| 62 """Update the scene surface.""" | |
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79
fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
14
diff
changeset
|
63 for widget in self.widgets: |
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fe8652a060df
Simple menu screen and TextChoice widget
Stefano Rivera <stefano@rivera.za.net>
parents:
14
diff
changeset
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64 widget.draw(surface) |
| 14 | 65 |
| 66 | |
| 67 class UserEvent(object): | |
| 68 | |
| 69 utype = "UNKNOWN" | |
| 70 | |
| 71 @classmethod | |
| 72 def post(cls, **kws): | |
| 73 ev = pygame.event.Event(USEREVENT, utype=cls.utype, **kws) | |
| 74 pygame.event.post(ev) | |
| 75 | |
| 76 @classmethod | |
| 77 def matches(cls, ev): | |
| 78 return ev.type is USEREVENT and ev.utype == cls.utype | |
| 79 | |
| 80 class ChangeScene(UserEvent): | |
| 81 | |
| 82 utype = "CHANGE_SCENE" | |
| 83 | |
| 84 @classmethod | |
| 85 def post(cls, next_scene): | |
| 86 super(ChangeScene, cls).post(next_scene=next_scene) |