wxruby users - Oct 2007 - Problems with creating my own syntax highlighter

Well, I wanted to make my own syntax highlighter using Wx::StyledTextCtrl.
The easiest way to do it seemed to parse the text contents in a
content-changed-event. But it doesn''t seem to work..

I tried to edit the scintilla sample and added this event(@sci is the
StyledTextCtrl):


    @sci.evt_stc_change(@sci.get_id)  do
        @sci.clear_document_style
        @sci.start_styling(1,31)
        @sci.style_set_font_attr(10, 10, "Courier", true, true, true)
        @sci.set_styling(2,10)
        puts 1
    end

This prints out "1" when you edit the text(twice actually, which i do
not
understand), but doesn''t change the text layout. But if I put it in an
event
triggered by a button, it will work(onEOL is triggered by clicking the
"show
end of line" button in the scintilla sample):

  def onEOL
    @sci.clear_document_style
    @sci.start_styling(1,31)
    @sci.style_set_font_attr(10, 10, "Courier", true, true, true)
    @sci.set_styling(2,10)
    puts 1
  end

As soon as I click the button, the second and third character get styled. I
don''t get why it doesn''t work in the text content changed
event. What
happens there, is it intended not to work? What is the best way to get it to
work?


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Christian Bielert wrote:
> Well, I wanted to make my own syntax highlighter using 
> Wx::StyledTextCtrl. The easiest way to do it seemed to parse the text 
> contents in a content-changed-event. But it doesn''t seem to work..
I would have expected the code you posted to work too, but the following 
seems to work for me (Linux/GTK), hooking into evt_stc_updateui

    @sci.style_set_font_attr(10, 10, "Courier", true, true, true)
    @sci.evt_stc_updateui(@sci) do | e |
      @sci.clear_document_style
      @sci.start_styling(2,31)
      @sci.set_styling(5,10)
      @sci.set_save_point
    end

style_set_xxx only needs to be called once per style, per control. It 
seems to be a reasonably expensive call so putting it outside the loop 
got rid of any lag for me.

There are a few odd things going on with StyledTextEvent - from the 
Scintilla docs evt_stc_change should only get called when the text is 
modifed, but it seems to be getting called repeatedly. And 
StyledTextEvent should inherit from Wx::Event, but it currently inherits 
from Wx::Control (!). I''ll look into those and hopefully fix something 
up for the next release.

Thanks for the report.

cheers
alex