# Copyright (C) 2020 by ÿnérant, eichhornchen, nicomarg, charlse
# SPDX-License-Identifier: GPL-3.0-or-later
import curses
import sys
from typing import Any, Optional, Tuple, Union
from squirrelbattle.display.texturepack import TexturePack
from squirrelbattle.game import Game
from squirrelbattle.tests.screen import FakePad
class Display:
x: int
y: int
width: int
height: int
pad: Any
_color_pairs = {(curses.COLOR_WHITE, curses.COLOR_BLACK): 0}
_colors_rgb = {}
def __init__(self, screen: Any, pack: Optional[TexturePack] = None):
self.screen = screen
self.pack = pack or TexturePack.get_pack("ascii")
def newpad(self, height: int, width: int) -> Union[FakePad, Any]:
"""
Overwrites the native curses function of the same name.
"""
return curses.newpad(height, width) if self.screen else FakePad()
def truncate(self, msg: str, height: int, width: int) -> str:
"""
Truncates a string into a string adapted to the width and height of
the screen.
"""
height = max(0, height)
width = max(0, width)
lines = msg.split("\n")
lines = lines[:height]
lines = [line[:width] for line in lines]
return "\n".join(lines)
def translate_color(self, color: Union[int, Tuple[int, int, int]]) -> int:
"""
Translates a tuple (R, G, B) into a curses color index.
If we already have a color index, then nothing is processed.
If this is a tuple, we construct a new color index if non-existing
and we return this index.
The values of R, G and B must be between 0 and 1000, and not
between 0 and 255.
"""
if isinstance(color, tuple):
# The color is a tuple (R, G, B), that is potentially unknown.
# We translate it into a curses color number.
if color not in self._colors_rgb:
# The color does not exist, we create it.
color_nb = len(self._colors_rgb) + 8
self.init_color(color_nb, color[0], color[1], color[2])
self._colors_rgb[color] = color_nb
color = self._colors_rgb[color]
return color
def addstr(self, pad: Any, y: int, x: int, msg: str,
fg_color: Union[int, Tuple[int, int, int]] = curses.COLOR_WHITE,
bg_color: Union[int, Tuple[int, int, int]] = curses.COLOR_BLACK,
*, altcharset: bool = False, blink: bool = False,
bold: bool = False, dim: bool = False, invis: bool = False,
italic: bool = False, normal: bool = False,
protect: bool = False, reverse: bool = False,
standout: bool = False, underline: bool = False,
horizontal: bool = False, left: bool = False,
low: bool = False, right: bool = False, top: bool = False,
vertical: bool = False, chartext: bool = False) -> None:
"""
Displays a message onto the pad.
If the message is too large, it is truncated vertically and horizontally
The text can be bold, italic, blinking, ... if the right parameters are
given. These parameters are translated into curses attributes.
The foreground and background colors can be given as curses constants
(curses.COLOR_*), or by giving a tuple (R, G, B) that corresponds to
the color. R, G, B must be between 0 and 1000, and not 0 and 255.
"""
height, width = pad.getmaxyx()
# Truncate message if it is too large
msg = self.truncate(msg, height - y, width - x - 1)
if msg.replace("\n", "") and x >= 0 and y >= 0:
fg_color = self.translate_color(fg_color)
bg_color = self.translate_color(bg_color)
# Get the pair number for the tuple (fg, bg)
# If it does not exist, create it and give a new unique id.
if (fg_color, bg_color) in self._color_pairs:
pair_nb = self._color_pairs[(fg_color, bg_color)]
else:
pair_nb = len(self._color_pairs)
self.init_pair(pair_nb, fg_color, bg_color)
self._color_pairs[(fg_color, bg_color)] = pair_nb
# Compute curses attributes from the parameters
attr = self.color_pair(pair_nb)
attr |= curses.A_ALTCHARSET if altcharset else 0
attr |= curses.A_BLINK if blink else 0
attr |= curses.A_BOLD if bold else 0
attr |= curses.A_DIM if dim else 0
attr |= curses.A_INVIS if invis else 0
# Italic is supported since Python 3.7
italic &= sys.version_info >= (3, 7,)
attr |= curses.A_ITALIC if italic else 0
attr |= curses.A_NORMAL if normal else 0
attr |= curses.A_PROTECT if protect else 0
attr |= curses.A_REVERSE if reverse else 0
attr |= curses.A_STANDOUT if standout else 0
attr |= curses.A_UNDERLINE if underline else 0
attr |= curses.A_HORIZONTAL if horizontal else 0
attr |= curses.A_LEFT if left else 0
attr |= curses.A_LOW if low else 0
attr |= curses.A_RIGHT if right else 0
attr |= curses.A_TOP if top else 0
attr |= curses.A_VERTICAL if vertical else 0
attr |= curses.A_CHARTEXT if chartext else 0
return pad.addstr(y, x, msg, attr)
def init_pair(self, number: int, foreground: int, background: int) -> None:
return curses.init_pair(number, foreground, background) \
if self.screen else None
def color_pair(self, number: int) -> int:
return curses.color_pair(number) if self.screen else 0
def init_color(self, number: int, red: int, green: int, blue: int) -> None:
return curses.init_color(number, red, green, blue) \
if self.screen else None
def resize(self, y: int, x: int, height: int, width: int,
resize_pad: bool = True) -> None:
"""
Resizes a pad.
"""
self.x = x
self.y = y
self.width = width
self.height = height
if hasattr(self, "pad") and resize_pad and \
self.height >= 0 and self.width >= 0:
self.pad.erase()
self.pad.resize(self.height + 1, self.width + 1)
def refresh(self, *args, resize_pad: bool = True) -> None:
"""
Refreshes a pad
"""
if len(args) == 4:
self.resize(*args, resize_pad)
self.display()
def refresh_pad(self, pad: Any, top_y: int, top_x: int,
window_y: int, window_x: int,
last_y: int, last_x: int) -> None:
"""
Refreshes a pad on a part of the window.
The refresh starts at coordinates (top_y, top_x) from the pad,
and is drawn from (window_y, window_x) to (last_y, last_x).
If coordinates are invalid (negative indexes/length...), then nothing
is drawn and no error is raised.
"""
top_y, top_x = max(0, top_y), max(0, top_x)
window_y, window_x = max(0, window_y), max(0, window_x)
screen_max_y, screen_max_x = self.screen.getmaxyx() if self.screen \
else (42, 42)
last_y, last_x = min(screen_max_y - 1, last_y), \
min(screen_max_x - 1, last_x)
if last_y >= window_y and last_x >= window_x:
# Refresh the pad only if coordinates are valid
pad.noutrefresh(top_y, top_x, window_y, window_x, last_y, last_x)
def display(self) -> None:
"""
Draw the content of the display and refresh pads.
"""
raise NotImplementedError
def update(self, game: Game) -> None:
"""
The game state was updated.
Indicate what to do with the new state.
"""
raise NotImplementedError
def handle_click(self, y: int, x: int, attr: int, game: Game) -> None:
"""
A mouse click was performed on the coordinates (y, x) of the pad.
Maybe it should do something.
"""
@property
def rows(self) -> int:
return curses.LINES if self.screen else 42
@property
def cols(self) -> int:
return curses.COLS if self.screen else 42
class VerticalSplit(Display):
"""
A class to split the screen in two vertically with a pretty line.
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.pad = self.newpad(self.rows, 1)
@property
def width(self) -> int:
return 1
@width.setter
def width(self, val: Any) -> None:
pass
def display(self) -> None:
for i in range(self.height):
self.addstr(self.pad, i, 0, "┃")
self.refresh_pad(self.pad, 0, 0, self.y, self.x,
self.y + self.height - 1, self.x)
class HorizontalSplit(Display):
"""
A class to split the screen in two horizontally with a pretty line.
"""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.pad = self.newpad(1, self.cols)
@property
def height(self) -> int:
return 1
@height.setter
def height(self, val: Any) -> None:
pass
def display(self) -> None:
for i in range(self.width):
self.addstr(self.pad, 0, i, "━")
self.refresh_pad(self.pad, 0, 0, self.y, self.x, self.y,
self.x + self.width - 1)
class Box(Display):
"""
A class for pretty boxes to print menus and other content.
"""
title: str = ""
def update_title(self, title: str) -> None:
self.title = title
def __init__(self, *args, fg_border_color: Optional[int] = None, **kwargs):
super().__init__(*args, **kwargs)
self.pad = self.newpad(self.rows, self.cols)
self.fg_border_color = fg_border_color or curses.COLOR_WHITE
def display(self) -> None:
self.addstr(self.pad, 0, 0, "┏" + "━" * (self.width - 2) + "┓",
self.fg_border_color)
for i in range(1, self.height - 1):
self.addstr(self.pad, i, 0, "┃", self.fg_border_color)
self.addstr(self.pad, i, self.width - 1, "┃", self.fg_border_color)
self.addstr(self.pad, self.height - 1, 0,
"┗" + "━" * (self.width - 2) + "┛", self.fg_border_color)
if self.title:
self.addstr(self.pad, 0, (self.width - len(self.title) - 8) // 2,
f" == {self.title} == ", curses.COLOR_GREEN,
italic=True, bold=True)
self.refresh_pad(self.pad, 0, 0, self.y, self.x,
self.y + self.height - 1, self.x + self.width - 1)