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November 3, 2017 12:25
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How to display a scrollable curses pad from python
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#!/usr/bin/env python2 | |
import curses | |
import time | |
mypad_contents = [] | |
def main(scr): | |
# Create curses screen | |
scr.keypad(True) | |
curses.use_default_colors() | |
curses.noecho() | |
scr.refresh() | |
# Get screen width/height | |
height,width = scr.getmaxyx() | |
# Create a curses pad (pad size is height + 10) | |
mypad_height = 32767 | |
mypad = curses.newpad(mypad_height, width); | |
mypad.scrollok(True) | |
mypad_pos = 0 | |
mypad_refresh = lambda: mypad.refresh(mypad_pos+2, 0, 0, 0, height-1, width) | |
mypad_refresh() | |
# Fill the window with text (note that 5 lines are lost forever) | |
try: | |
for i in range(0, 33): | |
mypad.addstr("{0} This is a sample string...\n".format(i)) | |
if i > height: mypad_pos = min(i - height, mypad_height - height) | |
mypad_refresh() | |
#time.sleep(0.05) | |
# Wait for user to scroll or quit | |
running = True | |
while running: | |
ch = scr.getch() | |
if ch == curses.KEY_DOWN and mypad_pos < mypad.getyx()[0] - height - 1: | |
mypad_pos += 1 | |
mypad_refresh() | |
elif ch == curses.KEY_UP and mypad_pos > -2: | |
mypad_pos -= 1 | |
mypad_refresh() | |
elif ch < 256 and chr(ch) == 'q': | |
running = False | |
elif ch == curses.KEY_RESIZE: | |
height,width = scr.getmaxyx() | |
while mypad_pos > mypad.getyx()[0] - height - 1: | |
mypad_pos -= 1 | |
mypad_refresh() | |
except KeyboardInterrupt: pass | |
# Store the current contents of pad | |
for i in range(0, mypad.getyx()[0]): | |
mypad_contents.append(mypad.instr(i, 0)) | |
curses.wrapper(main) | |
# Write the old contents of pad to console | |
print '\n'.join(mypad_contents) |
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