Last Updated: 20 Apr 2023 11:59 by ADMIN
Created on: 23 Oct 2014 07:27
Category: RichTextBox
Type: Feature Request
RichTextBox: Add support for complex script languages with combining characters (Thai, Telugu, Devanagari)
In some complex script languages, like Telugu and Thai language, some characters are grouped (e.g. consonants + vowels) in new grapheme. 

For example, type 'p' in Telugu - 'జ', followed by 'ో' - they are combined in new grapheme - 'జో', or paste the following Thai grapheme: ชื

UI correctly visualizes this, but:
- Text measuring assumes that the grapheme width is equal to the sum of the widths of its parts (characters), which is not correct. Selection and caret position are scrambled because of this.
- There are document positions between  the grapheme parts (characters), but shouldn't.
- When the caret is before the grapheme, deleting with "Delete" key deletes the grapheme in multiple steps (character by character), but should delete it in single step. Deleting with "Backspace" works correctly.
- There are some unsupported combinations in some languages. For example in Thai, typing 'z' then 'y' will produce grapheme, but typing 'w' then 'y' will not produce grapheme, and the 'y' should be ignored.
Posted on: 20 Apr 2023 11:59


Currently, there are no plans or additional information regarding the implementation of this feature or a possible solution I can offer you. I also don't want to accidentally mislead you by giving you a false availability date. The best I can offer you is to vote and subscribe to the task. As soon as any item is resolved we immediately update its status and notify our clients.

In case there is anything further you'd like to ask, feel free to do so.

Regards, Yoan Progress Telerik

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Posted on: 20 Apr 2023 09:09
Hi. I need a Solution for export Thai (or any other complex Language) document as pdf. Is there any solution for now? I'm using Telerik rich Text editor for windows form