Re: [TCLCORE] TIP #262: Background Images for Frames

[Peter M. <pe...@pd...>]

Eric,

In case you or anyone out there is serious about this, I've attached a di=
f=20
file against CVS HEAD of a patch that is a start for adding a -bgimage
option to the Tk Text widget.  (This is really just copied from tkhtml.)=20
Currently, it looks right on startup, but has a number of problems:

  - it messes up the cursor position when it moves
  - it updates only lines that have text.
  - Doesn't take into account x/y offset of scroll

And I'm sure there are others.  To see what it looks like go to:

  http://pdqi.com/textbg.gif


Peter

On April 3, 2006 01:07 pm, Eric Taylor wrote:
> At 08:15 AM 4/3/2006 -0700, Peter MacDonald wrote:
> >Currently a bgimage can be implement in canvas at the script level, bu=
t it
> > is messy and there is no such option for text...
>
> A number of good ideas have surfaced since the TIP was
> published.
>
> -------- canvas approach
>
> I've been experimenting using canvases in place of frames,
> and I'm now wondering what, if anything, a canvas cannot do
> that a frame can do. I've experimented with nested canvases,
> just like nested frames and so far it all seems to work.
>
> I've also seen some pure tcl code that will tile an image.
>
> The one other idea that has surfaced, and for which I was
> about to modify the TIP, was to add an option for
> transparency. If a canvas's background image could be made
> transparent then perhaps there's no need to change frames.
>
> I was also thinking that when implementing transparency, one
> would use
>
> -transparent <float>
>
>
> where 0. was totally opaque, and 1. was totally transparent.
> This could potentially allow for semi-transparency. If a
> system couldn't implement this, it could just then round the
> value to 0/1 for opaque/transparent.
>
> If this was a configurable option, then some cool fade in/out
> effects on images could be created by stepping the value
> between 0. .. 1. over a short timespan.
>
> -------  paved widgets
>
> It has also come to my attention that there's a package
> called Paved::widgets which does do tiling and also
> background images. It can transform an existing frame into a
> Paved::frame.
>
> http://web.tiscali.it/irrational/tcl/paved1.1/doc/index.html
>
>
> I have posted a question about transparency, and the only
> other issue might be that this also requires the snit
> package. I've often had difficulty with scripts that need
> lots of packages, as they then become much more difficult to
> deploy. But that's just my situation.
>
>
> Eric Taylor
>
>
>
>
>
>
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--=20
Peter MacDonald                 PDQ Interfaces Inc
Email: pe...@pd...      =09http://pdqi.com
Phone: (250) 595-5998