Re: Text in a wimp window

From	Bob Latham <bob@sick-of-spam.invalid>
Newsgroups	comp.sys.acorn.programmer
Subject	Re: Text in a wimp window
Date	2025-08-16 16:10 +0100
Organization	None
Message-ID	<5c4d57a507bob@sick-of-spam.invalid> (permalink)
References	<5c4be2e7bbbob@sick-of-spam.invalid> <5c4c6c50b0basura@invalid.addr.uk> <5c4cd689e8bob@sick-of-spam.invalid> <mpro.t11uf400fdgng0dmf.news@stevefryatt.org.uk>

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In article <mpro.t11uf400fdgng0dmf.news@stevefryatt.org.uk>,
   Steve Fryatt <news@stevefryatt.org.uk> wrote:
> On 15 Aug, Bob Latham wrote in message
>     <5c4cd689e8bob@sick-of-spam.invalid>:

> > I have been looking at the possibility of using icons. The big
> > disappointment with them to me is that I don't think you can
> > change the pointer to text buffer *after* the icon has been
> > created. So no fast and easy way to make an icon based window
> > scroll even just a few lines.

> Use self-redraw and Wimp_PlotIcon, plus a single icon template that
> you change the details in before each call. That way, you can also
> set the window extent and use normal Wimp scrolling.

> For an example in C, see (sorry, this is probably Iris or a
> non-RISC OS browser).

> https://github.com/steve-fryatt/printpdf/blob/eede3c2050353f55c0151776e187dd9bb0181696/src/convert.c#L1571

> (there's similar code in CashBook, Locate, PS2Paper, Puzzles and
> probably other places too, but I think this is the smallest and
> simplest example that I've got).

That sounds fantastic I would love to be able to code that up. For me
who's old and not terribly bright I have two mountains to climb.
Firstly understanding the principal and detail of your concept and
secondly tackling a window redraw loop which I've never done and have
avoided for decades.

I think it would take me a very long time to understand your C code,
but I may be able to understand your concept.

On your icon method, have I grasped this?.. 
These icons are just temporary and in effect they place a line of
text on the window and then the icon no longer exists, just leaving
the text on the screen. That means you can create them as you need
without any count?

Wow. I had no idea that was possible.

Is this on the right lines..
  Plot an icon for line 1 near top of screen.

Next text line comes along...
  Plot an icon for line 2 under line 1.

Continue until screen is filled then....
Next line comes in.
Plot a new bottom icon which covers the previous one.

Plot an icon 1 line higher with the text for what was the bottom line
last time. etc.

As for the redraw loop..
 Can I cheat to start with? ie. rely on the clip window and redraw
the entire window each time? Have that as a sort of base camp for
this mountain climb.

Fantastic. Thanks for the idea Steve.

Not sure I'm clever enough to work all this out but I'm going to try.

Cheers,

Bob.

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Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-13 20:18 +0100
  Re: Text in a wimp window druck <news@druck.org.uk> - 2025-08-14 09:35 +0100
    Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-14 09:54 +0100
    Re: Text in a wimp window Theo <theom+news@chiark.greenend.org.uk> - 2025-08-14 10:03 +0100
      Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-14 10:45 +0100
        Re: Text in a wimp window Sebastian Barthel <naitsabes@freenet.de> - 2025-08-14 14:37 +0000
          Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-14 17:57 +0100
      Re: Text in a wimp window Theo <theom+news@chiark.greenend.org.uk> - 2025-08-14 16:12 +0100
  Re: Text in a wimp window Richard Ashbery <basura@invalid.addr.uk> - 2025-08-14 21:19 +0100
    Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-15 16:39 +0100
      Re: Text in a wimp window Steve Fryatt <news@stevefryatt.org.uk> - 2025-08-15 20:06 +0100
        Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-16 16:10 +0100
          Re: Text in a wimp window Steve Fryatt <news@stevefryatt.org.uk> - 2025-08-18 11:50 +0100
            Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-18 12:58 +0100
            Re: Text in a wimp window Bob Latham <bob@sick-of-spam.invalid> - 2025-08-20 18:35 +0100
              Re: Text in a wimp window Sebastian Barthel <naitsabes@freenet.de> - 2025-08-21 13:01 +0000
              Re: Text in a wimp window Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-08-23 00:31 +0100
      Re: Text in a wimp window Jean-Michel <jmc.bruck@orange.fr> - 2025-08-17 18:01 +0200

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