TRichView.com

// Returns index of paragraph style in rvs having all properties // of the ParaNo-th style, but the specified BiDiMode function GetParaNo(rvs: TRVStyle; ParaNo: Integer; BiDiMode: TRVBiDiMode): Integer; var ParaStyle: TParaInfo; begin ParaStyle := TParaInfo.Create(nil); ParaStyle.Assign(rvs.ParaSty...

About pasting. That demo does not use Unicode, so pasted Unicode text will be converted to ANSI. Well, this is one more demo: http://www.trichview.com/support/files/actiontest_bidi_uni.zip It has both bidi and Unicode support turned on. In addition, I added a combobox on toolbar allowing to switch R...

This file does not contain enough information to be loaded in this demo. It was saved without text and paragraph styles, so it can be opened only in application having the same collections of styles what was used when creating this file. Resaving this file in the Editor1 demo will help (this demo ha...

No, I understand you. I just said that this demo was compiled without support of bidirected text. I compiled actiontest demo with support of bidi text: http://www.trichview.com/support/files/actiontestbidi.zip I set RichViewEdit1.BiDiMode = rvbdLeftToRight, and added text and paragraph direction act...

You cannot do it in compiled exe, you need to recompile it for this.

This demo enumerates all available fonts having ARABIC_CHARSET or HEBREW_CHARSET.
Make sure Control Panel -> Regional and Language Options ... option "Install files for complex scripts and right-to-left languages" is checked.

To turn on support of bidirectional text, set RichViewEdit.BiDiMode = rvbdLeftToRight or rvbdRightToLeft.

There is no direct example for these operations.
But some ideas can be found here: http://www.trichview.com/forums/viewtopic.php?t=1421 (table sorting)

Can you give me step-by-step instructions how to reproduce this problem?

The error may occur, for example, because of mismatched calls of SetUndoGroupMode. Do you call this method?

I am not sure how DevExpress buttons work, but probably some button's property must be set to allow it be checked (stay pressed)

No, you can only insert pictures (TBitmap, TMetafile or other, inherited from TGraphic) or Delphi controls in text.

May be I still do not understand the source of the problem. To my opinion, document in zoom = 100% and zoom = 101% must look almost identically. If it is displayed wrong, the whole drawing procedure must be changed, not only displaying in 100%. (Moreover, as far as I know how ScaleRichView works, do...

But I believe in components displaying scaled text, it is always scaled. They do not have two drawing functions, one for scaled text and one for 100% zoom.

EM_POSFROMCHAR is not supported.
As for displaying menu at the caret position, see the demo
Demos\Delphi\Assorted\AutoComplete\