fix RTL Table View

[yasseralsaidi]

to fix RTL Table View that show content table from left to right instead of right to left
i add an option to show RTL content in table as proper RTL direction
just by adding .showRTL() in headers & data .

example code:

final table = pw.Table.fromTextArray(
    headers: tableHeaders.showRTL(),
    data: tableData.showRTL(),
...

before add showRTL:

after add showRTL:

[codecov-commenter]

Codecov Report

Merging #1147 (78bb055) into master (016cba4) will decrease coverage by 0.21%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1147      +/-   ##
==========================================
- Coverage   38.35%   38.13%   -0.22%     
==========================================
  Files         131      131              
  Lines       19550    19523      -27     
==========================================
- Hits         7499     7446      -53     
- Misses      12051    12077      +26     

Impacted Files	Coverage Δ
pdf/lib/src/widgets/table.dart	93.14% <0.00%> (-2.74%)	⬇️
pdf/lib/src/pdf/obj/border.dart	0.00% <0.00%> (-10.00%)	⬇️
pdf/lib/src/pdf/obj/signature.dart	0.00% <0.00%> (-4.55%)	⬇️
pdf/lib/src/pdf/obj/page_label.dart	0.00% <0.00%> (-1.67%)	⬇️
pdf/lib/src/widgets/chart/point_chart.dart	32.69% <0.00%> (-1.27%)	⬇️
pdf/lib/src/pdf/document.dart	73.91% <0.00%> (-1.09%)	⬇️
pdf/lib/src/pdf/obj/outline.dart	74.07% <0.00%> (-0.93%)	⬇️
pdf/lib/src/pdf/obj/page.dart	72.22% <0.00%> (-0.76%)	⬇️
pdf/lib/src/widgets/flex.dart	71.76% <0.00%> (-0.65%)	⬇️
pdf/lib/src/widgets/decoration.dart	75.79% <0.00%> (-0.61%)	⬇️
... and 26 more

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[DavBfr]

It's not the right way to do it. Flutter automatically reverse the columns when there is a Directionality(textDirection: TextDirection.rtl) ancester Widget.

[yasseralsaidi]

@DavBfr so why it shows the wrong direction even if we use textDirection as RTL?
can we fix it and integrated with (textDirection == TextDirection.rtl) to do my method automatically!

like:

if (textDirection == TextDirection.rtl) {
  headers= headers.showRTL();
  data= data.showRTL();
} else {
headers= headers;
data= data;
}

[DavBfr]

The table layout must take the direction into account.
in this function: https://github.com/DavBfr/dart_pdf/blob/master/pdf/lib/src/widgets/table.dart#L432