如何让 Ltk 显示用户正在编写的内容以及函数打印的内容？

发布于 2024-07-08 19:39:58 字数 431 浏览 7 评论 0原文

功能的种类是这样的：

(defun display-all ()
  "Display all items in the database."
  (dolist (item *database*)
    (format t "~{~a:~10t~a~%~}~%" item)))

(defun prompt-read (prompt)
  (format *query-io* "~a: " prompt)
  (force-output *query-io*)
  (read-line *query-io*))

(defun prompt-for-item ()
  (make-database
   (prompt-read "Name")
   (prompt-read "Price")))

我已经阅读了 Ltk 文档，但似乎没有任何文本小部件使用的示例。

原文

The kind of functions are of the sort of:

(defun display-all ()
  "Display all items in the database."
  (dolist (item *database*)
    (format t "~{~a:~10t~a~%~}~%" item)))

(defun prompt-read (prompt)
  (format *query-io* "~a: " prompt)
  (force-output *query-io*)
  (read-line *query-io*))

(defun prompt-for-item ()
  (make-database
   (prompt-read "Name")
   (prompt-read "Price")))

I've read the Ltk documentation, but there doesn't seem to be any examples of text widget usage.

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鸢与 2024-07-15 19:39:58

您可以像创建其他小部件一样创建文本小部件。 Lisp 端对象具有带有 writer 方法的 text 访问器函数，该函数在 Tk 端设置文本。最小的例子：

(with-ltk ()
  (let* ((text-widget (make-instance 'text :width 15 :height 2))
         (b1 (make-instance 'button
                            :text "Print"
                            :command #'(lambda () (princ (text text-widget)))))
         (b2 (make-instance 'button :text "Reset"
                            :command #'(lambda () (setf (text text-widget) "reset")))))
    (pack text-widget)
    (pack b1)
    (pack b2)))

You create the text widget like every other widget. The Lisp-side object has text accessor function with writer method which sets the text on Tk side. Minimal example:

(with-ltk ()
  (let* ((text-widget (make-instance 'text :width 15 :height 2))
         (b1 (make-instance 'button
                            :text "Print"
                            :command #'(lambda () (princ (text text-widget)))))
         (b2 (make-instance 'button :text "Reset"
                            :command #'(lambda () (setf (text text-widget) "reset")))))
    (pack text-widget)
    (pack b1)
    (pack b2)))

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