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"""SDL2 helper functions."""
import ctypes
from .. import SDL_Init, SDL_Quit, SDL_QuitSubSystem, SDL_WasInit, \
SDL_INIT_VIDEO, error, events, timer
_HASSDLTTF = True
try:
from .. import sdlttf
except ImportError:
_HASSDLTTF = False
_HASSDLIMAGE = True
try:
from .. import sdlimage
except ImportError:
_HASSDLIMAGE = False
__all__ = ["SDLError", "init", "quit", "get_events", "TestEventProcessor"]
class SDLError(Exception):
"""A SDL2 specific exception class."""
def __init__(self, msg=None):
"""Creates a new SDLError instance with the specified message.
If no msg is passed, it will try to get the current SDL2 error via
sdl2.error.SDL_GetError().
"""
super(SDLError, self).__init__()
self.msg = msg
if not msg:
self.msg = error.SDL_GetError()
def __str__(self):
return repr(self.msg)
def init():
"""Initializes the SDL2 video subsystem.
Raises a SDLError, if the SDL2 video subsystem could not be
initialised.
"""
if SDL_Init(SDL_INIT_VIDEO) != 0:
raise SDLError()
def quit():
"""Quits the SDL2 video subysystem.
If no other subsystems are active, this will also call
sdl2.SDL_Quit(), sdlttf.TTF_Quit() and sdlimage.IMG_Quit().
"""
SDL_QuitSubSystem(SDL_INIT_VIDEO)
if SDL_WasInit(0) != 0:
if _HASSDLTTF and sdlttf.TTF_WasInit() == 1:
sdlttf.TTF_Quit()
if _HASSDLIMAGE:
sdlimage.IMG_Quit()
SDL_Quit()
def get_events():
"""Gets all SDL events that are currently on the event queue."""
events.SDL_PumpEvents()
evlist = []
SDL_PeepEvents = events.SDL_PeepEvents
op = events.SDL_GETEVENT
first = events.SDL_FIRSTEVENT
last = events.SDL_LASTEVENT
while True:
evarray = (events.SDL_Event * 10)()
ptr = ctypes.cast(evarray, ctypes.POINTER(events.SDL_Event))
ret = SDL_PeepEvents(ptr, 10, op, first, last)
if ret <= 0:
break
evlist += list(evarray)[:ret]
if ret < 10:
break
return evlist
class TestEventProcessor(object):
"""A simple event processor for testing purposes."""
def run(self, window):
"""Starts an event loop without actually processing any event."""
event = events.SDL_Event()
running = True
while running:
ret = events.SDL_PollEvent(ctypes.byref(event), 1)
if ret == 1:
if event.type == events.SDL_QUIT:
running = False
break
window.refresh()
timer.SDL_Delay(10)
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