wxruby users - Jun 2007 - Wx::TextCtrl and wxMSW

Hey Alex,

Found a solution to the problem that was occuring with wxMSW and the
Wx::TextCtrl, have yet to verify that this will work in linux, but my little
trick to the matter, was simple, thanks to the things that are provided with
both Wx::TextCtrl, and Wx::Window classes.

I''m providing this bit of information for thoes who may have trouble
with
dealing with Wx::TextCtrl, _AND_ have word wrapping action going on.  As
this seems to be a problem with dealing with word wrapping, I''ve been
able
to create a solution to make autoscrolling work.

I create my own method for appending text to the Wx::TextCtrl buffer, Named
append_buffer.

Here is what it looks like:

class MyBuffer < Wx::TextCtrl
  def append_buffer(text)
    # I have some processing of the text to colorize it, but I think this is
just generally a problem
    # with word wrapping in general
    self.freeze  # Freeze the buffer, so the control doesn''t try to
scroll
on us, don''t need that.  Plus makes for faster updates
    succ,c,sl = self.position_to_xy(self.get_last_position)  # Need to know
where we are at in the buffer.  Only part used is sl
    # Here is where I process my text, but shouldn''t be needed for
other
stuff, least your doing an Extended Text Formatting
    self.append_text(text)
    self.thaw # Okay, we are done adding, so you can clear out now
    succ,c,se = self.position_to_xy(self.get_last_position) # Now we need to
know where the buffer is, since we added data.
    self.scroll_lines((el-sl)+2) # Move the window to the last line given.
 Add 2 more fake lines, to ensure we get to the absolute bottom
  end
end

And that''s all there is to it.  Just happy to finally figure this out,
cause
it was bugging the heck out of me.  I''ll write back here in a few, once
I
test the changes on Linux, and ensure it works there as well, without any
problems.


Mario Steele


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Following up,

Confirmed, that this patch also works perfectly fine on wxGTK as well.  One
of the major obstacles out of my way, finally.  Was about to tear my hair
out from trying to figure out ways to get around this.  Even went as far as
to write a control to handle the displaying of the text, but I wanted to
avoid that, if I could use Wx::TextCtrl.  Just to psyched about not having
to write a work around on it.

L8ers,

Mario Steele

On 6/17/07, Mario Steele <mario at ruby-im.net>
wrote:
>
> Hey Alex,
>
> Found a solution to the problem that was occuring with wxMSW and the
> Wx::TextCtrl, have yet to verify that this will work in linux, but my
little
> trick to the matter, was simple, thanks to the things that are provided
with
> both Wx::TextCtrl, and Wx::Window classes.
>
> I''m providing this bit of information for thoes who may have
trouble with
> dealing with Wx::TextCtrl, _AND_ have word wrapping action going on.  As
> this seems to be a problem with dealing with word wrapping, I''ve
been able
> to create a solution to make autoscrolling work.
>
> I create my own method for appending text to the Wx::TextCtrl buffer,
> Named append_buffer.
>
> Here is what it looks like:
>
> class MyBuffer < Wx::TextCtrl
>   def append_buffer(text)
>     # I have some processing of the text to colorize it, but I think this
> is just generally a problem
>     # with word wrapping in general
>     self.freeze  # Freeze the buffer, so the control doesn''t try
to scroll
> on us, don''t need that.  Plus makes for faster updates
>     succ,c,sl = self.position_to_xy(self.get_last_position )  # Need to
> know where we are at in the buffer.  Only part used is sl
>     # Here is where I process my text, but shouldn''t be needed for
other
> stuff, least your doing an Extended Text Formatting
>     self.append_text (text)
>     self.thaw # Okay, we are done adding, so you can clear out now
>     succ,c,se = self.position_to_xy(self.get_last_position) # Now we need
> to know where the buffer is, since we added data.
>     self.scroll_lines ((el-sl)+2) # Move the window to the last line
> given.  Add 2 more fake lines, to ensure we get to the absolute bottom
>   end
> end
>
> And that''s all there is to it.  Just happy to finally figure this
out,
> cause it was bugging the heck out of me.  I''ll write back here in
a few,
> once I test the changes on Linux, and ensure it works there as well,
without
> any problems.
>
>
> Mario Steele
>
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Hi Mario

Firstly, very sorry for the delay in replying. I''ve been abroad, on 
holiday and off line for a little while.

Mario Steele wrote:
> Found a solution to the problem that was occuring with wxMSW and the 
> Wx::TextCtrl, have yet to verify that this will work in linux, but my 
> little trick to the matter, was simple, thanks to the things that are 
> provided with both Wx::TextCtrl, and Wx::Window classes.
Thanks for sharing that method. Once I read your email and re-read the 
bug I realised it was same as/similar to something I worked around for 
Weft QDA, using freeze/remember position/thaw.

Since we''ve both hit the same problem and solution I''m
inclined to add
this to wxSugar for the next release.

alex