调整终端大小时，Python 会诅咒窗口闪烁

Question

This is my first post on stack overflow so I hope I'm doing it properly.

I am currently working on a Terminal User Interface for python applications . I know that there are many ready-to-use libraries such as npyscreen out there, but I wantend to create one as programming excercice. In particular, I wanted to to play with some architectural patterns to learn them.

All that said, I'm currently facing several problems with python curses library , that I'm using as low level interface to the terminal.

The problems arise when I try to resize my terminal. As you can see from the code (see below), I handle the terminal resizing in the main loop, invoking the getmaxyx()() method of my curses window and redrawing what is on the screen accordingly.

The problem is that the screen seems to flicker when I try to resize the terminal.

Moreover, my "curses application" works fine on MacOS but totally crashes on windows (even after installing windows curses).

To handle that I tried to re-write the low-level interfice by using the blessed library. It solved the windows crashing problem , but the flickering still remains.

I can not figure out what the problem is.

Fore those wishing to help me, here follows the github page of the project: Terminal GUI on GitHub

Thank you in advance.

Answer 1

With curses , there's (at least) 3 things to look for:

• ncurses can handle SIGWINCH (PDCurses may not)

• some Python configurations interfere with ncurses receiving SIGWINCH . If your program never receives KEY_RESIZE (which it's not checking for...), then it's time to file a bug report for Python to get that fixed.

• some programs don't actively read keyboard input (and if KEY_RESIZE isn't read , ncurses won't update the screensize. That would make the program crash.