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#!/usr/bin/env python3
import curses
import threading
from .globals import CURSES_LOCK
class Pager:
def set_dim(self, height, width):
if height < 4 or width < 10:
raise ValueError("Size too small")
with self._lock:
if (height, width) != (self._height, self._width):
self.win.erase()
self.win.noutrefresh()
self.win.resize(height, width)
self.win.redrawwin()
self._height = height
self._width = width
self._regen_actual()
self._redraw()
def set_pos(self, y, x):
with self._lock:
if (y, x) != (self._y, self._x):
self.win.mvwin(y, x)
self._y = y
self._x = x
self.win.noutrefresh()
def _redraw(self):
with self._lock, CURSES_LOCK:
start = max(0, self._bottom_a - self._height + 2)
end = self._bottom_a
todisp = self._actual[start:end]
if len(todisp) < self._height-2 and len(todisp) < len(self._actual):
end = self._bottom_a+self._height-2-len(todisp)
todisp += self._actual[self._bottom_a:end]
self.win.erase()
self.win.border()
if start > 0:
self.win.addch(0, self._width//2, '⯅')
for n, l in enumerate(todisp, 1):
self.win.addstr(n, 1, l)
if end < len(self._actual):
self.win.addch(self._height-1, self._width//2, '⯆')
self.win.refresh()
def _split_line(self, l):
with self._lock:
lines = []
while len(l) >= self._width-2:
lines.append(l[:self._width-3] + '…')
l = "⮡ "+l[self._width-3:]
lines.append(l)
return lines
def _regen_actual(self):
with self._lock:
self._actual = []
for n, l in enumerate(self._lines):
self._actual += self._split_line(l)
if n == self._bottom:
self._bottom_a = len(self._actual)
self._bottom_a = max(self._bottom_a, self._height-2)
def display_many(self, s, split=False):
with self._lock:
if split and self._lines:
self._lines.append("")
self._actual.append("")
for l in s:
self._lines.append(l)
self._actual += self._split_line(l)
self._bottom = len(self._lines) - 1
self._bottom_a = len(self._actual)
self._redraw()
def display(self, s):
self.display_many((s, ))
def user_page(self, refresh=None):
curses.curs_set(0)
while True:
l = self.win.getch()
with self._lock:
if l == curses.KEY_RESIZE:
if refresh is not None:
refresh()
elif l == ord('q'):
break
elif l in (ord('k'), curses.KEY_UP):
if self._bottom_a > self._height-2:
self._bottom_a -= 1
self._redraw()
elif l in (ord('j'), curses.KEY_DOWN):
if self._bottom_a < len(self._actual):
self._bottom_a += 1
self._redraw()
elif l == curses.KEY_NPAGE:
if self._bottom_a < len(self._actual):
self._bottom_a = min(len(self._actual), self._bottom_a + self._height - 2)
self._redraw()
elif l == curses.KEY_PPAGE:
if self._bottom_a > 0:
self._bottom_a = max(self._height - 2, self._bottom_a - self._height + 2)
self._redraw()
elif l == curses.KEY_HOME:
if self._bottom_a > self._height - 2:
self._bottom_a = self._height - 2
self._redraw()
elif l == curses.KEY_END:
if self._bottom_a < len(self._actual):
self._bottom_a = len(self._actual)
self._redraw()
curses.curs_set(1)
def clear(self):
with self._lock:
self._lines = []
self._actual = []
self._bottom_a = 0
self._bottom = -1
self._redraw()
def __init__(self, y, x, height, width):
with CURSES_LOCK:
self.win = curses.newwin(height, width, y, x)
self.win.leaveok(True)
self.win.keypad(True)
self._lock = threading.RLock()
self._height = height
self._width = width
self._y = -1
self._x = -1
self._lines = []
self._actual = []
self._bottom = -1
self._bottom_a = 0
self.set_pos(y, x)
self.set_dim(height, width)
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