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