From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/elisp/abstract-display-example.html | 96 ----------------------------- 1 file changed, 96 deletions(-) delete mode 100644 devdocs/elisp/abstract-display-example.html (limited to 'devdocs/elisp/abstract-display-example.html') diff --git a/devdocs/elisp/abstract-display-example.html b/devdocs/elisp/abstract-display-example.html deleted file mode 100644 index 4e9c36ea..00000000 --- a/devdocs/elisp/abstract-display-example.html +++ /dev/null @@ -1,96 +0,0 @@ -

Abstract Display Example

Here is a simple example using functions of the ewoc package to implement a color components display, an area in a buffer that represents a vector of three integers (itself representing a 24-bit RGB value) in various ways. 

(setq colorcomp-ewoc nil
-      colorcomp-data nil
-      colorcomp-mode-map nil
-      colorcomp-labels ["Red" "Green" "Blue"])
-
-(defun colorcomp-pp (data)
-  (if data
-      (let ((comp (aref colorcomp-data data)))
-        (insert (aref colorcomp-labels data) "\t: #x"
-                (format "%02X" comp) " "
-                (make-string (ash comp -2) ?#) "\n"))
-    (let ((cstr (format "#%02X%02X%02X"
-                        (aref colorcomp-data 0)
-                        (aref colorcomp-data 1)
-                        (aref colorcomp-data 2)))
-          (samp " (sample text) "))
-      (insert "Color\t: "
-              (propertize samp 'face
-                          `(foreground-color . ,cstr))
-              (propertize samp 'face
-                          `(background-color . ,cstr))
-              "\n"))))
-
-(defun colorcomp (color)
-  "Allow fiddling with COLOR in a new buffer.
-The buffer is in Color Components mode."
-  (interactive "sColor (name or #RGB or #RRGGBB): ")
-  (when (string= "" color)
-    (setq color "green"))
-  (unless (color-values color)
-    (error "No such color: %S" color))
-  (switch-to-buffer
-   (generate-new-buffer (format "originally: %s" color)))
-  (kill-all-local-variables)
-  (setq major-mode 'colorcomp-mode
-        mode-name "Color Components")
-  (use-local-map colorcomp-mode-map)
-  (erase-buffer)
-  (buffer-disable-undo)
-  (let ((data (apply 'vector (mapcar (lambda (n) (ash n -8))
-                                     (color-values color))))
-        (ewoc (ewoc-create 'colorcomp-pp
-                           "\nColor Components\n\n"
-                           (substitute-command-keys
-                            "\n\\{colorcomp-mode-map}"))))
-    (set (make-local-variable 'colorcomp-data) data)
-    (set (make-local-variable 'colorcomp-ewoc) ewoc)
-    (ewoc-enter-last ewoc 0)
-    (ewoc-enter-last ewoc 1)
-    (ewoc-enter-last ewoc 2)
-    (ewoc-enter-last ewoc nil)))
-
-

This example can be extended to be a color selection widget (in other words, the “controller” part of the “model–view–controller” design paradigm) by defining commands to modify colorcomp-data and to finish the selection process, and a keymap to tie it all together conveniently. 

(defun colorcomp-mod (index limit delta)
-  (let ((cur (aref colorcomp-data index)))
-    (unless (= limit cur)
-      (aset colorcomp-data index (+ cur delta)))
-    (ewoc-invalidate
-     colorcomp-ewoc
-     (ewoc-nth colorcomp-ewoc index)
-     (ewoc-nth colorcomp-ewoc -1))))
-
-(defun colorcomp-R-more () (interactive) (colorcomp-mod 0 255 1))
-(defun colorcomp-G-more () (interactive) (colorcomp-mod 1 255 1))
-(defun colorcomp-B-more () (interactive) (colorcomp-mod 2 255 1))
-(defun colorcomp-R-less () (interactive) (colorcomp-mod 0 0 -1))
-(defun colorcomp-G-less () (interactive) (colorcomp-mod 1 0 -1))
-(defun colorcomp-B-less () (interactive) (colorcomp-mod 2 0 -1))
-
-(defun colorcomp-copy-as-kill-and-exit ()
-  "Copy the color components into the kill ring and kill the buffer.
-The string is formatted #RRGGBB (hash followed by six hex digits)."
-  (interactive)
-  (kill-new (format "#%02X%02X%02X"
-                    (aref colorcomp-data 0)
-                    (aref colorcomp-data 1)
-                    (aref colorcomp-data 2)))
-  (kill-buffer nil))
-
-(setq colorcomp-mode-map
-      (let ((m (make-sparse-keymap)))
-        (suppress-keymap m)
-        (define-key m "i" 'colorcomp-R-less)
-        (define-key m "o" 'colorcomp-R-more)
-        (define-key m "k" 'colorcomp-G-less)
-        (define-key m "l" 'colorcomp-G-more)
-        (define-key m "," 'colorcomp-B-less)
-        (define-key m "." 'colorcomp-B-more)
-        (define-key m " " 'colorcomp-copy-as-kill-and-exit)
-        m))
-
-

Note that we never modify the data in each node, which is fixed when the ewoc is created to be either nil or an index into the vector colorcomp-data, the actual color components.

-

- Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc.
Licensed under the GNU GPL license.
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Abstract-Display-Example.html -

-
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