Undo mechanism during text editing

#1

Hi,

When editing a tiddler and the bullet list formatting is selected (or any other format choices) repeat clicking on the button reverses the change.

What is the mechanism /code behind that action?

-kp

#2

for bullet points the code is in the tiddler $:/core/modules/editor/operations/text/prefix-lines.js

It seems the code removes the prefix if it exists, and only adds it when none existed .

1 Like
#3

Right — it’s not so much an “undo” but a “toggle” button.

For what it’s worth, as long as you’re within the same tiddler-edit session, browsers themselves usually allow something like an undo keystroke within a text-entry window…3

#4

Thanks.

Is it safe to say if I clone the button for bullet points and modify the action, it is not straightforward to replicate the ‘toggle’ behavior. (i.e. revert the modification)?

#5

There is no undo in the standard editor. There is in this plugin https://unieditor.tiddlyhost.com/

#6

Most of the Editor toolbar buttons are using the edit-text-operations which were designed for purpose, and this click to reverse occurs.

Have a look at the items with the tag $:/tags/EditorToolbar in particular $:/core/ui/EditorToolbar/list-number keep in mind you can have more than one action in these tiddlers.