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From: Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>
Newsgroups: comp.lang.ada
Subject: Re: Web-UI for Ada applications
Date: Wed, 28 Aug 2013 11:32:43 +0000 (UTC)
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Date: 2013-08-28T11:32:43+00:00
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On 2013-08-28, Gour <gour@atmarama.net> wrote:
> On Wed, 28 Aug 2013 11:35:36 +0200
> Jacob Sparre Andersen <jacob@jacob-sparre.dk> wrote:
>
>> The problem with this is that you both add an extra "OS" layer (the
>> browser) _and_ require GUI operations to be interpreted (to some
>> extent) rather than executed as binary code.
>
> I'm not sure I get the 2nd part?
>

When a program which uses, say, the GTK toolkit wants to draw a text box
on the screen, it does it by making a direct subroutine call to the
GTK function from the program itself.

OTOH, if you use HTML input to render a text box in the browser, then the
HTML code is treated as source code input to the browser's rendering
engine and needs to first be translated to a internal format before the
rendering engine can process the HTML code.

IOW, every time the rendering engine reads the HTML input, it needs to
treat it in the same way as, say, a Python or bash interpreter would
treat it's input.

Given the high level nature of pure HTML itself, this should not be too
great a overhead for pure HTML code. However, this can change if the input
also contains a scripting language (such as Javascript) section as well
as the HTML code.

Simon.

-- 
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world