複雑window.scrollすぎてウィンドウのコンテンツを移動できませんでした。代わりに、curses.newpad私のためにそれをしました。
パッドを作成します。
mypad = curses.newpad(40,60)
mypad_pos = 0
mypad.refresh(mypad_pos, 0, 5, 5, 10, 60)
次に、からのmypad_pos入力に応じて増減してスクロールできます。window.getch()cmd
if cmd == curses.KEY_DOWN:
mypad_pos += 1
mypad.refresh(mypad_pos, 0, 5, 5, 10, 60)
elif cmd == curses.KEY_UP:
mypad_pos -= 1
mypad.refresh(mypad_pos, 0, 5, 5, 10, 60)
window.scrollok（True）を設定します。
I wanted to use a scrolling pad to display content of some large text files but this didn't work well because texts can have line breaks and it was pretty hard to figure out how many characters to display at a time to fit the good number of columns and rows.
So I decided to first split my text files in lines of exactly COLUMNS characters, padding with spaces when lines were too short. Then scrolling the text become more easy.
Here is a sample code to display any text file:
#!/usr/bin/python
# -*- coding: utf-8 -*-
import curses
import locale
import sys
def main(filename, filecontent, encoding="utf-8"):
try:
stdscr = curses.initscr()
curses.noecho()
curses.cbreak()
curses.curs_set(0)
stdscr.keypad(1)
rows, columns = stdscr.getmaxyx()
stdscr.border()
bottom_menu = u"(↓) Next line | (↑) Previous line | (→) Next page | (←) Previous page | (q) Quit".encode(encoding).center(columns - 4)
stdscr.addstr(rows - 1, 2, bottom_menu, curses.A_REVERSE)
out = stdscr.subwin(rows - 2, columns - 2, 1, 1)
out_rows, out_columns = out.getmaxyx()
out_rows -= 1
lines = map(lambda x: x + " " * (out_columns - len(x)), reduce(lambda x, y: x + y, [[x[i:i+out_columns] for i in xrange(0, len(x), out_columns)] for x in filecontent.expandtabs(4).splitlines()]))
stdscr.refresh()
line = 0
while 1:
top_menu = (u"Lines %d to %d of %d of %s" % (line + 1, min(len(lines), line + out_rows), len(lines), filename)).encode(encoding).center(columns - 4)
stdscr.addstr(0, 2, top_menu, curses.A_REVERSE)
out.addstr(0, 0, "".join(lines[line:line+out_rows]))
stdscr.refresh()
out.refresh()
c = stdscr.getch()
if c == ord("q"):
break
elif c == curses.KEY_DOWN:
if len(lines) - line > out_rows:
line += 1
elif c == curses.KEY_UP:
if line > 0:
line -= 1
elif c == curses.KEY_RIGHT:
if len(lines) - line >= 2 * out_rows:
line += out_rows
elif c == curses.KEY_LEFT:
if line >= out_rows:
line -= out_rows
finally:
curses.nocbreak(); stdscr.keypad(0); curses.echo(); curses.curs_set(1)
curses.endwin()
if __name__ == '__main__':
locale.setlocale(locale.LC_ALL, '')
encoding = locale.getpreferredencoding()
try:
filename = sys.argv[1]
except:
print "Usage: python %s FILENAME" % __file__
else:
try:
with open(filename) as f:
filecontent = f.read()
except:
print "Unable to open file %s" % filename
else:
main(filename, filecontent, encoding)
The main trick is the line:
lines = map(lambda x: x + " " * (out_columns - len(x)), reduce(lambda x, y: x + y, [[x[i:i+out_columns] for i in xrange(0, len(x), out_columns)] for x in filecontent.expandtabs(4).splitlines()]))
First, tabulations in the text are converted to spaces, then I used splitlines() method to convert my text in array of lines. But some lines may be longer than our COLUMNS number, so I splitted each line in chunk of COLUMNS characters and then used reduce to transform the resulting list in a list of lines. Finally, I used map to pad each line with trailing spaces so that its length is exactly COLUMNS characters.
Hope this helps.
This is the answer of this question: How to make a scrolling menu in python-curses
This code allows you to create a little scrolling menu in a box from a list of strings.
You can also use this code getting the list of strings from a sqlite query or from a csv file.
To edit the max number of rows of the menu you just have to edit max_row.
If you press enter the program will print the selected string value and its position.
from __future__ import division #You don't need this in Python3
import curses
from math import *
screen = curses.initscr()
curses.noecho()
curses.cbreak()
curses.start_color()
screen.keypad( 1 )
curses.init_pair(1,curses.COLOR_BLACK, curses.COLOR_CYAN)
highlightText = curses.color_pair( 1 )
normalText = curses.A_NORMAL
screen.border( 0 )
curses.curs_set( 0 )
max_row = 10 #max number of rows
box = curses.newwin( max_row + 2, 64, 1, 1 )
box.box()
strings = [ "a", "b", "c", "d", "e", "f", "g", "h", "i", "l", "m", "n" ] #list of strings
row_num = len( strings )
pages = int( ceil( row_num / max_row ) )
position = 1
page = 1
for i in range( 1, max_row + 1 ):
if row_num == 0:
box.addstr( 1, 1, "There aren't strings", highlightText )
else:
if (i == position):
box.addstr( i, 2, str( i ) + " - " + strings[ i - 1 ], highlightText )
else:
box.addstr( i, 2, str( i ) + " - " + strings[ i - 1 ], normalText )
if i == row_num:
break
screen.refresh()
box.refresh()
x = screen.getch()
while x != 27:
if x == curses.KEY_DOWN:
if page == 1:
if position < i:
position = position + 1
else:
if pages > 1:
page = page + 1
position = 1 + ( max_row * ( page - 1 ) )
elif page == pages:
if position < row_num:
position = position + 1
else:
if position < max_row + ( max_row * ( page - 1 ) ):
position = position + 1
else:
page = page + 1
position = 1 + ( max_row * ( page - 1 ) )
if x == curses.KEY_UP:
if page == 1:
if position > 1:
position = position - 1
else:
if position > ( 1 + ( max_row * ( page - 1 ) ) ):
position = position - 1
else:
page = page - 1
position = max_row + ( max_row * ( page - 1 ) )
if x == curses.KEY_LEFT:
if page > 1:
page = page - 1
position = 1 + ( max_row * ( page - 1 ) )
if x == curses.KEY_RIGHT:
if page < pages:
page = page + 1
position = ( 1 + ( max_row * ( page - 1 ) ) )
if x == ord( "\n" ) and row_num != 0:
screen.erase()
screen.border( 0 )
screen.addstr( 14, 3, "YOU HAVE PRESSED '" + strings[ position - 1 ] + "' ON POSITION " + str( position ) )
box.erase()
screen.border( 0 )
box.border( 0 )
for i in range( 1 + ( max_row * ( page - 1 ) ), max_row + 1 + ( max_row * ( page - 1 ) ) ):
if row_num == 0:
box.addstr( 1, 1, "There aren't strings", highlightText )
else:
if ( i + ( max_row * ( page - 1 ) ) == position + ( max_row * ( page - 1 ) ) ):
box.addstr( i - ( max_row * ( page - 1 ) ), 2, str( i ) + " - " + strings[ i - 1 ], highlightText )
else:
box.addstr( i - ( max_row * ( page - 1 ) ), 2, str( i ) + " - " + strings[ i - 1 ], normalText )
if i == row_num:
break
screen.refresh()
box.refresh()
x = screen.getch()
curses.endwin()
exit()
Another way is to print the visible items using for-loop on list with slice notation. That is, you choose a specific part of the list to display, then add or subtract an increment to change the range every time you press a key up or down.
like list[ y : y + coverage ] where y is the start and coverage determines how many items in the list you'd like to display.
from curses import wrapper
import curses
def main(stdscr):
mY = curses.LINES
win = curses.newwin(100,50,0,50)
win.keypad(True)
numbers = [n for n in range(0,1001)]
ylen = len(numbers)
iny = 0
border_y = mY-5
def scroll(window):
[window.addstr(y, 0, f'{b} \n') for y, b in enumerate(numbers[iny:iny+border_y])]
window.refresh()
scroll(win)
### KEY PRESS ###
while(True):
ch = win.getkey()
if ch == 'KEY_UP':
if(iny>0):
iny-=1
scroll(win)
elif ch == 'KEY_DOWN':
if(iny<ylen-border_y):
iny+=1
scroll(win)
elif ch == 'q':
break
wrapper(main)