Fuck me! I tried to upgrade tview and the first thing I notice is a shitload of added dependency versions:

go.mod | 18 ++++-----
go.sum | 97 ++++++++++++++++++++++++++++++++++++++-----------

My code does not compile anymore as the view.FormItem interface was extended. Get/SetDisabled(…) are quickly implemented, no worries.

But the tview.Primitive (what makes a widget) interface has now a bunch of PRIVATE methods. For focus handling. Would you believe that!? Thanks, I cannot satisfy this interface in my very custom widgets anymore. Okay then, I just embed *tview.Box. tt now successfully compiles, but does not react anymore on key presses and the message tree is not focused either.

I’m not in the mood to debug this shit. :-( Lunch time.

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@movq@www.uninformativ.de I just ran across another thing. At least I personally couldn’t care less about CI infrastructure changes. Whether they’re using github action a or b or c or version v or w, it is not of my interest. At all. (It might be useful to estimate the supply chain attack risk, though.) If the maintainers want to include them in the changelog – and there are probably people to whom this information is crucial – it’s probably best to document CI infrastructure changes in their own section.

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@movq@www.uninformativ.de You may want to include another antipattern to avoid in your article:

• bump $same_dependency from 1.0.0 to 1.0.1
  
• bump $same_dependency from 1.0.1 to 1.0.2
  
• bump $same_dependency from 1.0.2 to 1.1.0
  
• bump $same_dependency from 1.1.0 to 1.2.0

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@movq@www.uninformativ.de Thank you very much! So, the concept is very similar. The root widget gets the input and can pass it to whatever child has the focus and so on.

My two main issues are the API design, that the input handler sometimes get an additional callback to notify the application about which element is focused, but sometimes not. And that focus switching sometimes just does not work as expected. Anyway.

As for rendering the selected button, I was also thinking about indicating it with some kind of border around it, square brackets seem to be a wonderful choice. :-)

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@itsericwoodward@itsericwoodward.com Why hear? I’ll just put it up at https://twtxt.app now shall I? It’s good enough IMO that it’s already working quite well. The challenging parts now is to figure out a good set of default publishing connectors to support? 🤔

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Comments URL: https://news.ycombinator.com/item?id=48523203

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@lyse@lyse.isobeef.org

With multicolored TUIs, I find it usually hard to immediately tell which button is selected if there are just two.

Indeed, I wouldn’t be able to tell in that example, either. movwin works around that by (mostly) assuming that there is no support for colors at all, so there should always be a way to tell which widget has focus, even without colors. That’s why it puts brackets around a button’s label when focused:

• Image

  
  

• Image

  
  

The fewer colors you use, the better, I guess. 🤔

@lyse@lyse.isobeef.org

Now I’m curious how movwin deals with that. ;-)

Focus handling? I hardly remember, lol. 😅 Did that 6 months ago and haven’t touched it since. Let’s see.

The core main loop gets keyboard/mouse events from curses. At this level, the main loop only knows about exactly one widget, so it passes the event to that widget (whatever that is, doesn’t matter – they all inherit from the Widget base class, it could be a Window, a WindowManager, or an Edit box directly).

The outermost widget is usually a WindowManager. It implements a few hotkeys of its own, like switching to another window. If none of those hotkeys match, it passes the event to the currently focused window.

Same story here: Window implements some hotkeys (like opening the menu bar). If none of those match, then … the magic happens.

Each Window acts as a focus manager. It can descend into its child widget hierarchy and collect all child widgets in a depth-first search. They are collected into a flat list. Each Window then has an attribute _focus_position, which is an index into that list. Pressing Tab or Shift+Tab increases or decreases that index and that allows you to select the next/previous focusable widget in the current window.

Eventually, Window passes the input event to the currently focused widget.

Usually on initialization, the application can ask a Window object to focus a certain widget. The file selection dialog does that, for example, because the “natural” focus order would be to focus the Edit box at the top of the window first – but that’s not what the user wants, the Table showing the list of files should be focused.

If no widget ever feels responsible for handling a certain input event, then there’s a global unhandled_input callback that the application can provide (same as in urwid).

I think that’s it.

Hm, that’s more complicated than I remembered, but apparently it works fine, because I completely forgot about this. 😅 All I did in the last few months was make new classes that inherit from Widget, like the new Table class or Edit or HexEdit or whatever, and if they want to get input events, then they must implement the methods input_key() or input_mouse().

Does this answer your question? 😅 (I admit that I didn’t exactly understand your scenario, so I just went ahead and rambled about my implementation. 😅)

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