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Changing the highlight color of selection text

Posted on 2006-07-05
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Last Modified: 2010-04-05
Hello guys

I am developing a system that can use microsoft sapi, I have a richedit with a text and my application will read it word by word, when my text is being read, I highlight the word that is being read, but the default colour or highlight comes from windows control and it is blue and color font white, I would like to change the color of my highlight and the font to a yellow hightligh and black color font.

How could I do that?

Thanks
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Question by:hidrau
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Expert Comment

by:ciuly
Comment Utility
hm.. on my machine it's black :)
anyway I found this:
http://groups.google.ro/group/borland.public.delphi.winapi/browse_thread/thread/aadf1893ade484d/f125b1e3d3532b73%23f125b1e3d3532b73
tried this:
  RichEdit1.SelStart:=2;
  RichEdit1.SelLength:=3;
  RichEdit1.SelAttributes.Color:=clblue;

and it returned yellow color on black background.
normally, the background will be dictated by the os, but it depends on the richedit background.
if you can get the richedit background to be blue and the font color to be white, then the highlight should be the one you want.

the issue is getting the background to be blue. I'll investigate further.
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by:ciuly
Comment Utility
also according to this http://groups.google.com/group/borland.public.delphi.winapi/browse_thread/thread/6e26aa50c565965/bf36cbaedf5dc137%23bf36cbaedf5dc137
it seems that indeed it cannot be done whitout modifying the system wide settings
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by:ciuly
Comment Utility
well .. I got your results by using:
  RichEdit1.SelAttributes.Color:=clwhite;
and setting the
  RichEdit1.Color:=clblue;
from designer
pretty ugly solution :)
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by:hidrau
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Ciuly, I think I need your help here, I don't know how could I highlight each word that is being read as you suggested, after reading the word, it must come back to the original color, could you lend me a hand here? This is the code that I am using .

Thanks

 // Get the event from the event queue
  tEvent := ChantTTS1.GetChantTTSEvent(0);
  // Check to see if there is text in the text box
  If Length(Texto) > 1 then
     begin
       wordLength := 0;
       // Get the current word spoken using word position
       startPosition := tEvent.Position;
       Memo1.SetFocus;
       Memo1.SelStart := startPosition;
       // Get the EngineAPI to determine is SAPI4 or SAPI5
       engineAPI := ChantTTS1.GetNumberProperty(CNPEngineAPI);
       if engineAPI = CESAPI5TTS then wordLength := tEvent.Length+1;  // Get the word length
       if engineAPI = CESAPI4TTS then
          begin
            // SAPI4 doesn't provide ength so calculate it
            str := Copy(Texto,startPosition+1,Length(Texto));
            If Pos(' ',str) = 0 Then endOfWord := Length(Str)
            Else endOfWord := Pos(' ',str);
            if (endOfWord > 0) then wordLength := Length( Copy(texto,startPosition,endOfWord))//endOfWord
            else wordLength := Length(texto) - startPosition;
          end;

        Memo1.SelLength := wordLength-1;

     End;
     // Remove the event from the event queue
     ChantTTS1.RemoveResource(CSREvent, 0);
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Expert Comment

by:ciuly
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you said in your question that this is with trichedit. in your code I see Memo1 whichi tells me it's about TMemo. So which one is it?

if it's a memo, you cannot do anything with the selection text color. only in richedit you can do that.
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Author Comment

by:hidrau
Comment Utility
no, only the name is a memo the component is a richedit
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Accepted Solution

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ciuly earned 500 total points
Comment Utility
ok.
you will do it like this.
declare variables
  restore:boolean = false;
  savedcolor:TColor;

before modifying the selection:

if restore then
        Memo1.SelAttributes.Color:=savedcolor;
savedcolor:=Memo1.SelAttributes.Color;
       restore:=true;

.......
add lines after  Memo1.SelLength := wordLength-1;
        Memo1.SelAttributes.Color:=clwhite;// or whatever color you which to make things vizible

the algorithm is like this:
- before you change the selection, save the color and if necessary restore the old one
- make the selection
- change selection color in what you desire

you will probably need to change in other places if you also change selection (like when user cancels, or whetever)
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by:hidrau
Comment Utility
ok, it changes my color font and for change the background color of my selection, is it possible?
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Expert Comment

by:ciuly
Comment Utility
no. only if chaning the system wide settings.

you will have to choose an appropriate font color so that the selection will be visible on blue background.

you can of course make the font be bold. that will make it more visible. the way to do it is similar to the color changing (you will need to also have a variable to save the initial style in. the change will be done like:

Memo1.SelAttributes.Style := Memo1.SelAttributes.Style + [fsBold];

if you consider, you can also change the font size to be bigger. or the font face itself displaying in some other font face.
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by:hidrau
Comment Utility
yeah ciuly, thanks very much for you support, it worked very fine.
regarding changing the background I was able to work around with RxrichEdit that I have installed in delphi. I had forgot it.

Thanks
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Author Comment

by:hidrau
Comment Utility
Ciuly, I made what you asked me to try, bellow you have the the code. Something that is happening is that I am having a lot of tremble on screen, I suspect that this is because  this line  Memo1.SelStart  := 0;
Could you check where I could improbe this code to avoid the tremble?

Thanks

  // Get the event from the event queue
  tEvent := ChantTTS1.GetChantTTSEvent(0);
  // Check to see if there is text in the text box
  If Length(Texto) > 1 then
     begin
       wordLength := 0;
       // Get the current word spoken using word position
       startPosition := tEvent.Position;
       Memo1.SetFocus;

       Memo1.SelStart  := 0;
       Memo1.SelLength := length(Texto);
       Memo1.SelAttributes.Color     := clBlack;
       Memo1.SelAttributes.BackColor := clwhite;
       Memo1.SelLength := 0;

       Memo1.SelStart := startPosition;
       // Get the EngineAPI to determine is SAPI4 or SAPI5
       engineAPI := ChantTTS1.GetNumberProperty(CNPEngineAPI);
       if engineAPI = CESAPI5TTS then wordLength := tEvent.Length+1;  // Get the word length
       if engineAPI = CESAPI4TTS then
          begin
            // SAPI4 doesn't provide ength so calculate it
            str := Copy(Texto,startPosition+1,Length(Texto));
            If Pos(' ',str) = 0 Then endOfWord := Length(Str)
            Else endOfWord := Pos(' ',str);
            if (endOfWord > 0) then wordLength := Length( Copy(texto,startPosition,endOfWord))//endOfWord
            else wordLength := Length(texto) - startPosition;
          end;

        Memo1.SelLength := wordLength-1;
        Memo1.SelAttributes.Color     := clblack;
        Memo1.SelAttributes.BackColor := clYellow;
        Memo1.SelLength := 0;
      End;
     // Remove the event from the event queue
     ChantTTS1.RemoveResource(CSREvent, 0);
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Expert Comment

by:ciuly
Comment Utility
from what I see, you never set memo1.selstart to a strict pozitive value. why is that? as I see there, you will alway select the text from the start to the current word. is that what you want to do?
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by:hidrau
Comment Utility
I wasn't able to do something different,

After highlighting the word I wasn't able to come back the default, the way I found was to select all the text once again and come back the default values.

maybe it is missing something or I am not knowing how to work with it better.

Could you lend me a hand?
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Expert Comment

by:ciuly
Comment Utility
oh, well you didn't read my comments correctly. I said that you need some variables in which to hold the initial values of the properties you will change.
look at the accepted answer. you see me mentioning a   restore:boolean and a savedcolor:TColor;
so you will also need to save the selstart property and restore it just as with the savedcolor variable.

you don't have to save the selstart though since that is not important (it will always be 0 or the length of the current word) but selstart needs to be saved in order to correctly restore the savedcolor ;)
sorry for not mentioning that before
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by:hidrau
Comment Utility
ok, I will try and let you know
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