使用read-char-exclusive时如何使用箭头键中止功能 [英] How to abort a function with an arrow key when using read-char-exclusive

问题描述

当函数依赖于 read-char-exclusive ？

本质上，我正在寻找一种方法来使Emacs认为箭头键是字符键。如果由于任何原因出现这种行为是有问题的，那么一旦功能按箭头键结束，行为就可以恢复正常。

Essentially, I'm looking for a way to make Emacs think that the arrow keys are character keys. If that behavior is problematic for any reasons, then perhaps the behavior could revert back to normal once the function ends by pressing an arrow key.

推荐答案

我想您需要使用 read-event 。

字符事件将作为相关整数，就像 read-char 。

Character events are returned as the relevant integer, just like read-char.

箭头键作为符号返回（离开， right ， up ， down

Arrow keys are returned as symbols (left, right, up, down).

(let ((event (read-event)))
  (cond ((characterp event)
         (message "Character: %s" (char-to-string event)))
        ((and (symbolp event) (memq event '(left right up down)))
         (message "Arrow key: %s" (symbol-name event)))
        (t
         (error "Unexpected event"))))

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