tk 嵌入的 xterm 的大小如何是动态的?

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问题描述

限时送ChatGPT账号..

可以编写一个简单的python脚本将xterm嵌入到tk框架中:

One can write a simple python script to embed an xterm into a tk frame:

from Tkinter import *
import subprocess

root = Tk()
termf = Frame(root, height=800, width=1000)

termf.pack(fill=BOTH, expand=YES)
wid = termf.winfo_id()

窗口建立后

proc = subprocess.Popen('xterm -into %d -sb ' % wid,shell=True)
root.mainloop()

在我的电脑上它看起来像即使在调整框架大小(通过拖动角)时，如何使嵌入的 xterm 动态调整为 termf 框架的大小?

On my computer it looks like How can I make the embedded xterm be dynamically sized to the size of the termf frame even when resizing the frame(by dragging the corner)?

回复@tinmarino

推荐答案

@EthanField 解决方案的实施.3个功能:

主要创建 gui、xterm 并堵塞管道on_resize 在包含终端的帧被调整大小时被调用get_xterm_pts 正在解析 pts 的输出以将 stdin 提供给 xterm

import tkinter as tk
import subprocess as sp
from re import match
from threading import Thread
from queue import Queue


def main():
    # Init
    root = tk.Tk()
    queue = Queue()

    # Pack main frame
    termf = tk.Frame(root, width=800, height=800)
    termf.pack(fill=tk.BOTH, expand=tk.YES, padx=0, pady=0)
    wid = termf.winfo_id()

    # Allow window resize
    sp.Popen("""echo '*VT100.allowWindowOps: true' | xrdb -merge""", shell=True)

    # Craft command
    cmd = (
        # Create into me
        f'xterm -into {wid} -geometry 100x50 '
        # Log to stdout
        r'-sb -l -lc -lf /dev/stdout '
        # Launch `ps` command: output, tty, = for remove header
        """-e /bin/bash -c "ps -o tt=;bash" """
        r'| tee'
    )
    print('Launching:', cmd)

    # Spawn Xterm
    process = sp.Popen(
        cmd, shell=True, stdout=sp.PIPE, stderr=sp.PIPE)
    print('Xterm pid:', process.pid)

    # Get pts
    thread = Thread(target=lambda: get_xterm_pts(termf, process, queue))
    thread.start()

    # Set resize callback
    termf.bind("<Configure>", lambda event: on_resize(event, queue))

    # Start
    root.mainloop()


def on_resize(event, queue):
    """On resize: send escape sequence to pts"""
    # Magic && Check
    magic_x, magic_y = 6.1, 13
    print('Resize (w, h):', event.width, event.height)
    if not queue.queue: return

    # Calculate
    width = int(event.width / magic_x)
    height = int(event.height / magic_y)
    print('To (lin,col):', height, width)
    ctl = f"\u001b[8;{height};{width}t"

    # Send to pts
    with open(queue.queue[0], 'w') as f:
        f.write(ctl)


def get_xterm_pts(parent, process, queue):
    """Retrieve pts(`process`) -> `queue`"""
    while True:
        out = process.stdout.readline().decode()
        print('Xterm out' + out)

        match_pts = match(r'pts/\d+', out)
        if match_pts:
            pts = '/dev/' + match_pts.group(0)
            print('-----------> pts:', pts)
            queue.put(pts)
            break

        if out == b'' and process.poll() is not None:
            break

    # Resize now
    fake_event = tk.Event()
    fake_event.width = parent.winfo_width()
    fake_event.height = parent.winfo_height()
    on_resize(fake_event, queue)


if __name__ == '__main__':
    main()

在新线程中搜索新 shell 的 pts 似乎很多，但我们想要交互式 shell 的 pts 而不是产生它的 sh.我实际上尝试了 pip -> pts 和一些 Popen ps，但它的弹性较差.

The search of the pts of the new shell in a new thread seems a lot, but we want the pts of the interactive shell and not the sh which spawn it. I actually tried pip -> pts with some Popen ps, and it was less resilient.

11844 pts/1    00:00:00 sh      <- pid returned to Popen
11847 pts/1    00:00:00 xterm   <- then ...
11848 pts/1    00:00:00 tee     <- that is how a pipe work, first plug, then spawn (apparently) (seems logical)
11854 pts/35   00:00:00 bash    <- then favorite shell is Michel 

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