Right To Left Components

[John Kouraklis 94]

Does anyone have experience with RTL languages in Delphi FMX?

 

I've seen FMXRTL.com but I am unable to download any of the demos and code from that website

[limelect 48]

@John Kouraklis I had very bad experience with the demo 

it did not work.

 

Edited October 3, 2019 by limelect

[John Kouraklis 94]

@limelectHave you got the demo to share?

 

Are there any other components/solutions?

[Maher Tannous 3]

try this from github

https://github.com/Zeus64/alcinoe

I don't test it

this app https://play.google.com/store/apps/details?id=club.kiskis.app&hl=en was made with it

[limelect 48]

@John Kouraklis  Sorry It was long ago. I do not know where the demo is.

I think i had a BPL specific to Delphi.

 

[John Kouraklis 94]

On 10/6/2019 at 8:48 AM, Maher Tannous said:

try this from github

https://github.com/Zeus64/alcinoe

I don't test it

this app https://play.google.com/store/apps/details?id=club.kiskis.app&hl=en was made with it

I know Alcione but didn't know it has RTL components. I will check thanks

[John Kouraklis 94]

6 hours ago, limelect said:

@John Kouraklis  Sorry It was long ago. I do not know where the demo is.

I think i had a BPL specific to Delphi.

 

No worries. I emailed the owner of the page and the download links work. 

 

Thanks anyway

[limelect 48]

@John Kouraklis   What did you do with the solution ?

alcinoe has no solution.

Is FMXRTL is the only solution?

[John Kouraklis 94]

@limelect I haven't really tried FMXRTL as I did not have the time.

 

But I did some research and couldn't find anything...sadly

[Rollo62 538]

There are some quite old suggestions, regarding D.P.F., but I havent test it.

[Serge_G 87]

Hi,

I don't write nor read RTL languages, I wrote a function to detect if the text starts with a RTL char

function checkRtl (S : string; Exceptions : String = '' ) : TTextAlign;
var carray : array of WideChar;
    i : int64;
    ws : String;
begin
   for I := 0 to 9 do
      S:=StringReplace(S,i.ToString,'',[rfReplaceAll]);
  // supprime autres caractères spéciaux
    S:=StringReplace(S,'(','',[rfReplaceAll]);
    S:=StringReplace(S,')','',[rfReplaceAll]);
    S:=StringReplace(S,'"','',[rfReplaceAll]);
    S:=StringReplace(S,'''','',[rfReplaceAll]);
    S:=StringReplace(S,'-','',[rfReplaceAll]);
   if not E.IsEmpty then
     begin
        for I := 1 to Length(Exceptions) do
                S:=StringReplace(S,Exceptions[i],'',[rfReplaceAll]);
     end;

   S:=Trim(S);
   // arabic + hebrew
   SetLength(carray,$6ff-$590);
   for I := $590 to $6ff do carray[i-$590]:=Char(I);
   // there are some farsi char to be added 
   
   result:=TTextAlign.Trailing;
   if S.IsEmpty then exit;
   if inOpArray(S[1],carray) then result:=TTextAlign.Leading;
end;

And, with Nabil's Help I test my ideas in a grid.

 

You can find (french) discussion here and my tutorial  https://serge-girard.developpez.com/tutoriels/Delphi/Livebindings/Grilles/#LVII-C-1 

I did not test for TEdit and TLabel though but my guess it is possible

[limelect 48]

@Serge_G This is for WIN project or IOS (not tested) BUT not for Android.

No solution yet. No TStringColumn in Android.

[limelect 48]

@John Kouraklis For now RTL is working in Android Studio where i

developed a few applications.

 

Delphi FMX Android is good , now a days , only for English.

[John Kouraklis 94]

@Serge_G How do you revert the order of the text that appears in the grid?

 

The code you show just changes the justification not the order of the letters

[Serge_G 87]

Oh, it seem that was the TTextLayout.RighttoLeft who do the trick but did not work for Android 😣  and I do not know if it works for those Apple things

My friend Nabil just send me an intyeresting link
 

 

[Alexander Sviridenkov 360]

FMX use different methods for text rendering on mobile and desktop platforms. On desktop platforms native OS methods are used (f.e. Direct2D text layout or CGContext) but on mobile platforms text is rendered as bitmap combination - each font symbol is stored in cache as bitmap.

This leads to no RTL support, bad kerning, etc and also is slow., This is why I had to write native canvas support for these platforms.

[John Kouraklis 94]

@Alexander Sviridenkov So, you don't use bitmaps on those platforms? but the native engines?

 

Do your components support then RTL?

[John Kouraklis 94]

@Serge_G Thanks for the link. It looks your friend has made it work

[John Kouraklis 94]

@Serge_G Digging a bit from the link you added, here's an interesting project

 

https://github.com/orwah/Arabic-Delphi-VCL-Units

 

But it is for VCL only

[Alexander Sviridenkov 360]

41 minutes ago, John Kouraklis said:

@Alexander Sviridenkov So, you don't use bitmaps on those platforms? but the native engines?

 

Do your components support then RTL?

Depends on selected canvas,  For iOS, Android and OSX there are both native and FMX canvases.

RTL is supported internally, library has own BIDI processor because even on native canvases each word is rendered separately, so layout should be prepared before passing to renderer.

[limelect 48]

@John Kouraklis It works.

I used this link

 

http://arabteam2000-forum.com/applications/core/interface/file/attachment.php?id=159065

1. with Delphi 10.2.3 i used the berlin version

2. My test project is fmx+memo

3. I added THE 3 pas files

4. i added FMX.Canvas.GPU.pas from the Delphi fmx source

5. I added path of Delphi source fmx to my project

6. compiled

7. apk to my samsung s6 phone

8. DID NOT CHANGE NOTHING IN THE SOURCE !!!!

9. AND IT WORKS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

10-. in my case it is HEBREW !!

 

P.S 4 not needed as you have 5

Edited November 2, 2019 by limelect

[limelect 48]

@Serge_G Thank you for your help

The link in your answer did the TRICK.

I had many weeks of search for the answer

 

[limelect 48]

I just put it in my REAL application and it works great.

[limelect 48]

Last thought. 

It is still not perfect solution.

As it is not a REAL BIDI. it is specific to Arabic or Hebrew but other 

languages do not apply. So it cannot be given to the world.

[limelect 48]

Further investigating it seem that my last statement (not real BIDI) mite

be wrong since

 

    if Char > 3000 then
      if ((Char = 3633) or ((Char >= 3635) and (Char <= 3642)) or
        ((Char >= 3655) and (Char <= 3662))) then
      begin
        if LastThaiChar = 0 then
          LastThaiChar := 3585;
        // DoLogInfo(format('Detected new advance from %d + %d',[ FLastThaiChar,char]));
        // Advance := FPaint.measureText(StringToJString(System.Char.ConvertFromUtf32(3585)+System.Char.ConvertFromUtf32(Char)));

        if Char = 3635 then // ׂ

          Advance := FPaint.measureText
            (StringToJString(System.Char.ConvertFromUtf32(LastThaiChar) +
            System.Char.ConvertFromUtf32(Char))) -
            FPaint.measureText
            (StringToJString(System.Char.ConvertFromUtf32(LastThaiChar)))
        else

          Advance := 0;

      end;

    if Char >= 3585 then
      if Char <= 3630 then
        LastThaiChar := Char;
 

since above section has nothing to do with MY !!! Hebrew fonts.

is it useless ???? i do not know.