List: implement levels of indent buttons

[mtias]

To create nested lists and sub-levels.

[ellatrix]

For this one we probably need the TinyMCE list plugin for now, which gives us these additional commands.

[mtias]

Should we couple Editable with that plugin or can we make a wrapper around it that is specific for List blocks?

[ellatrix]

We can either just add it for all Editable instances, or allow the block to change the plugins... I'm thinking for now it's fine to just add it to all?

[ellatrix]

Ah I see what you mean with adding the buttons... The plugin will come with the shortcuts working already. Somehow we'll need to tie the commands to the buttons.

[BoardJames]

In my current prototype I'm using tinymce.activeEditor to apply commands on the editor. I would like a better way if anyone has suggestions. Currently the only alternative I can think of is moving the indent/outdent code to the Editable like the alignment.

[BoardJames]

@jasmussen Are there plans for an isEnabled function for control buttons? I see in the blocks/README.md it mentions an isVisible function but that wouldn't be as useful for indent buttons.

[jasmussen]

Are there plans for an isEnabled function for control buttons? I see in the blocks/README.md it mentions an isVisible function but that wouldn't be as useful for indent buttons.

If we need it, we'll make it happen, is what I think. Could you ask @iseulde as well? She's our resident super expert on this stuff. She hangs out in #core-editor also.

[BoardJames]

The downside of the TinyMCE list plugin is that is captures tab keys to do list indenting which means that tab navigation stops working. :-( I'm still trying to find a way around this limitation.

[BoardJames]

I've submitted a pull request for this feature:
#717
There are still some unresolved issues like how to tie the commands to buttons in nicer ways than using the global tinymce.activeEditor. There is also the known tab navigation issue caused by the lists plugin which I hope to fix on the TinyMCE side.

[aduth]

Considering this resolved by #717

[jb510]

Apologies I'm having trouble finding somewhere appropriate for this feedback, but... I find not having tab function as indent (like it does in nearly every GUI) to be extremely confusing. That UI needs to get dropped for lots of reasons, along with rearranging blocks (those arrows drive me mad). Anyway, commenting here because it's related to tabs, but I really hope overriding the default keyboard shortcut for indenting lists isn't the ultimate solution here.

[BE-Webdesign]

@jb510

Tab support for list indentation can definitely be added in. I recommend opening a new issue. In the title state the need ( tab support for list indentation ). It is important to understand that Gutenberg is in active development, and is not fully polished yet.

If there is any common/standard functionality you feel is missing, chronicling each item in the issue tracker is of great help. Keep each issue focused and concise. If you have any questions, feel free to add a Question: issue or join the #core-editor slack channel.

[BoardJames]

@jb510 @BE-Webdesign The tab key was doing list indentation but I was told that it broke accessibility so it got disabled. It is very easy to re-enable it but you can't navigate out of the list block using the keyboard.