109 lines
2.9 KiB
Python
109 lines
2.9 KiB
Python
"""Package for game screens."""
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from __future__ import annotations
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from typing import Protocol, TypeAlias
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import attrs
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import tcod.console
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import tcod.event
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import g
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class Screen(Protocol):
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"""An abstract game screen."""
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__slots__ = ()
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def on_event(self, event: tcod.event.Event) -> ScreenResult:
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"""Called on events."""
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def on_draw(self, console: tcod.console.Console) -> None:
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"""Called when the screen is being drawn."""
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@attrs.define()
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class Push:
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"""Push a new screen on top of the stack."""
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screen: Screen
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@attrs.define()
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class Pop:
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"""Remove the current screen from the stack."""
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@attrs.define()
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class Reset:
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"""Replace the entire stack with a new screen."""
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screen: Screen
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ScreenResult: TypeAlias = "Push | Pop | Reset | None"
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"""Union of screen results."""
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def main_draw() -> None:
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"""Render and present the active screen."""
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if not g.screens:
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return
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g.background.clear()
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g.foreground.clear()
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g.screens[-1].on_draw(g.background)
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# g.context.present(g.console)
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g.sdl_renderer.copy(g.console_render.render(g.background))
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# g.sdl_renderer.copy(g.console_render.render(g.foreground))
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g.foreground.blit(g.background, fg_alpha=1.0, bg_alpha=0.0)
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g.sdl_renderer.copy(g.console_render.render(g.background))
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g.sdl_renderer.present()
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def _apply_screen_result(result: ScreenResult) -> None:
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"""Apply a ScreenResult to `g.screens`."""
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match result:
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case Push(screen=screen):
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g.screens.append(screen)
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case Pop():
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g.screens.pop()
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case Reset(screen=screen):
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while g.screens:
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_apply_screen_result(Pop())
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_apply_screen_result(Push(screen))
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case None:
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pass
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case _:
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raise TypeError(result)
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def main_loop() -> None:
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"""Run the active screen forever."""
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while g.screens:
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main_draw()
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for event in tcod.event.wait():
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if event.type == 'WindowClose':
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raise SystemExit()
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tile_event = g.context.convert_event(event)
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if g.screens:
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_apply_screen_result(g.screens[-1].on_event(tile_event))
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def get_previous_screen(screen: Screen) -> Screen | None:
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"""Return the screen before `screen` in the stack if it exists."""
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current_index = next(index for index, value in enumerate(g.screens) if value is screen)
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return g.screens[current_index - 1] if current_index > 0 else None
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def draw_previous_screens(screen: Screen, console: tcod.console.Console, dim: bool = True) -> None:
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"""Draw previous screens, optionally dimming all but the active screen."""
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prev_screen = get_previous_screen(screen)
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if prev_screen is None:
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return
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prev_screen.on_draw(console)
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if dim and screen is g.screens[-1]:
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console.rgb["fg"] //= 4
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console.rgb["bg"] //= 4
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