PyExplorer/src/IO/UI.py

116 lines
4 KiB
Python

from __future__ import annotations
import stat
from typing import TYPE_CHECKING
import curses
from ..items.Symlink import Symlink
from ..items.AItems import AItem
if TYPE_CHECKING:
from .App import App
class UI:
def __init__(self, app: App):
self._app = app
HEADER_ROWS = 1
def _get_attr(self, item: any, index: int) -> str:
pair = self.app.config.theme.pair_for(item.color_role)
attr = curses.color_pair(pair)
if index == self.app.navigator.cursor.pos:
attr |= curses.A_REVERSE
return attr
def render(self, stdscr: curses.window) -> None:
stdscr.erase()
height, width = stdscr.getmaxyx()
navigator = self.app.navigator
stdscr.addstr(0, 0, str(navigator.history[-1])[:width - 1])
items = navigator.items
available = max(0, height - self.HEADER_ROWS)
for index in range(min(available, len(items))):
item = items[index]
self._render_item(stdscr, item, index, index + self.HEADER_ROWS, width)
prompt = self.app.prompt
if prompt:
self._render_modal(stdscr, prompt, height, width)
MODAL_MAX_WIDTH = 60
MODAL_PADDING = 2
def _modal_lines(self, prompt) -> list[str]:
if prompt.kind == "text":
return [prompt.message + prompt.buffer]
if prompt.kind == "confirm":
return [prompt.message]
return [prompt.message, "(press any key)"]
def _render_modal(self, stdscr: curses.window, prompt,
screen_height: int, screen_width: int) -> None:
lines = self._modal_lines(prompt)
max_line = max(len(line) for line in lines)
inner_width = min(max_line, self.MODAL_MAX_WIDTH)
box_width = min(inner_width + 2 * self.MODAL_PADDING + 2,
screen_width - 2)
inner_width = box_width - 2 * self.MODAL_PADDING - 2
box_height = len(lines) + 2
top = max(0, (screen_height - box_height) // 2)
left = max(0, (screen_width - box_width) // 2)
attr = curses.A_NORMAL
if prompt.kind == "error":
attr = curses.color_pair(self.app.config.theme.pair_for("error"))
border = "+" + "-" * (box_width - 2) + "+"
pad = " " * self.MODAL_PADDING
stdscr.addstr(top, left, border, attr)
for i, line in enumerate(lines):
text = line[:inner_width].ljust(inner_width)
stdscr.addstr(top + 1 + i, left, "|" + pad + text + pad + "|", attr)
stdscr.addstr(top + box_height - 1, left, border, attr)
SIZE_UNITS = ("", "K", "M", "G", "T", "P")
@staticmethod
def _format_size(size: int) -> str:
value = float(size)
for unit in UI.SIZE_UNITS:
if value < 1024:
return str(int(value)) if unit == "" else f"{value:.1f}{unit}"
value /= 1024
return f"{value:.1f}E"
ARROW = " -> "
ARROW_LEN = len(ARROW)
def _render_item(self, stdscr: curses.window, item: AItem, index: int,
row: int, width: int) -> None:
name, size, perm = item.fields()
name_len = len(name)
col_width = int(width / 3)
attr = self._get_attr(item, index)
stdscr.addstr(row, 0, name.ljust(col_width), attr)
if type(item) is Symlink:
target_pair = self.app.config.theme.pair_for(
Symlink.target_role(item.point_to))
attr_arrow = curses.color_pair(0)
attr_target = curses.color_pair(target_pair)
if index == self.app.navigator.cursor.pos:
attr_arrow |= curses.A_REVERSE
attr_target |= curses.A_REVERSE
stdscr.addstr(row, name_len, self.ARROW, attr_arrow)
stdscr.addstr(row, name_len + self.ARROW_LEN, str(item.point_to), attr_target)
stdscr.addstr(row, col_width, self._format_size(size).ljust(col_width * 2), attr)
stdscr.addstr(row, col_width * 2, stat.filemode(perm), attr)
@property
def app(self) -> App:
return self._app