Right-to-left language (RTL) support in our WPF controls

07 October 2010

Something we haven’t made much hoopla about is the fact that our WPF controls, such as the DXGrid for WPF) support RTL languages out of the box. One of the reasons is simple: we’re all LTR people at DevExpress, of different languages and countries, sure, but we all read from the left to the right.

So Emil Mesropian, tech evangelist for our XPF products, ran a test (he knows Farsi, but heck no one knew...) on the DXGrid using Farsi.

DXGrid - RTL

The immediate thought is: aren’t the numbers supposed to be right-justified? Or does the justification of numbers flip to the other side of the column (like we have it here) when using an RTL language? We didn’t know so Emil did some more research:

TSE - RTL Table

This is a screenshot from the Tehran Stock Exchange. The problem here is that they use Eastern Arabic numerals and center-align them. Hmm.

Next bit of research:

TASE - RTL Table


This is from the Tel-Aviv Stock Exchange and shows Western Arabic digits like we’re used to in the West and right aligns them like we’re used to. So no numeric column flipping.

The mire gets deeper, though:

Israel RTL Percent

This shows that Hebrew shows that numbers with symbols are shown in the way we in the West expect. 


KFH - RTL Percent

On this Kuwaiti site, percentages are shown with the symbol before the number. Emil was unable to find anything during this bit of research that showed dollar amounts (like $123.45) or Euro values (like €123,45), and so on, so we’re not sure how those would be represented.

The problem now is: what should we do? Whose conventions should we follow? The Hebrew/Israeli one? Or should we pay just as much attention to Arabic languages?

And more importantly who can help us clarify how to do this properly?

[Aside 1: This is explicitly about our WPF controls. I am not going to answer any questions about RTL on other platforms.]

[Aside 2: Please remember we cannot export to several Arabic countries under our export license. One of those is Iran, so even though I’m showing a screenshot from a Tehran government entity’s website, it’s only for illustration purposes.]

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Hi Julian,

For most people at DX never used :-) but this is actually a setting in Windows.

Control Panel -> Settings -> Lanuage of User Interface -> Notations -> More Settings ->

Then on the tabsheet "Numbers" the two options

"Default Numbers" and "Use Language Specific Numbers."

Maybe some researching can find out if the locale contains any info on the LTR part of the numbers.

So just follow the win settings..


7 October 2010
Alex Boston
Alex Boston

Yes I agree with using windows/.Net Culture settings.

But if you want to generalize here is my input :

1 - regarding numbers : use Western Arabic digits 1234... and so on as already all RTL countries accepted this numbers and shifted to them ref  : http://www.ahram.org.eg/, http://www.alriyadh.com/, http://www.albayan.ae/.

2- Regarding symbols like % : 0.33% is ok and ref www.kuwaitse.com/.../A , http://www.tadawul.com.sa.

PS: I can post images also if you like but this isn't possible in comments.

8 October 2010

I'd side with @Raoulw It is always best to stick with window's globalization setting when possible. As for percentage mark placement goes in Iran, both will work.

10 October 2010

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