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* Magic to switch language of a space directly in front of a RTL<->LTR

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boundary, when the user enters text directly behind the boundary
  (patch by Dov Feldstern)
  


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18717 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Stefan Schimanski 2007-06-08 14:24:57 +00:00
parent db35f0f95e
commit 3aa79562d0
1 changed files with 46 additions and 1 deletions
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47
src/Text.cpp
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@ -5,6 +5,7 @@
* *
* \author Asger Alstrup * \author Asger Alstrup
* \author Lars Gullik Bjønnes * \author Lars Gullik Bjønnes
* \author Dov Feldstern
* \author Jean-Marc Lasgouttes * \author Jean-Marc Lasgouttes
* \author John Levon * \author John Levon
* \author André Pönitz * \author André Pönitz
@ -713,7 +714,51 @@ void Text::insertChar(Cursor & cur, char_type c)
} }
} }
// First check, if there will be two blanks together or a blank at // In Bidi text, we want spaces to be treated in a special way: spaces
// which are between words in different languages should get the
// paragraph's language; otherwise, spaces should keep the language
// they were originally typed in. This is only in effect while typing;
// after the text is already typed in, the user can always go back and
// explicitly set the language of a space as desired. But 99.9% of the
// time, what we're doing here is what the user actually meant.
//
// The following cases are the ones in which the language of the space
// should be changed to match that of the containing paragraph. In the
// depictions, lowercase is LTR, uppercase is RTL, underscore (_)
// represents a space, pipe (|) represents the cursor position (so the
// character before it is the one just typed in). The different cases
// are depicted logically (not visually), from left to right:
//
// 1. A_a|
// 2. a_A|
//
// Theoretically, there are other situations that we should, perhaps, deal
// with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
// point (to understand why, just try to create this situation...).
if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
// get font in front and behind the space in question. But do NOT
// use getFont(cur.pos()) because the character c is not inserted yet
Font const & pre_space_font = getFont(buffer, par, cur.pos() - 2);
Font const & post_space_font = real_current_font;
bool pre_space_rtl = pre_space_font.isVisibleRightToLeft();
bool post_space_rtl = post_space_font.isVisibleRightToLeft();
if (pre_space_rtl != post_space_rtl) {
// Set the space's language to match the language of the
// adjacent character whose direction is the paragraph's
// direction; don't touch other properties of the font
Language const * lang =
(pre_space_rtl == par.isRightToLeftPar(buffer.params())) ?
pre_space_font.language() : post_space_font.language();
Font space_font = getFont(buffer, par, cur.pos() - 1);
space_font.setLanguage(lang);
par.setFont(cur.pos() - 1, space_font);
}
}
// Next check, if there will be two blanks together or a blank at
// the beginning of a paragraph. // the beginning of a paragraph.
// I decided to handle blanks like normal characters, the main // I decided to handle blanks like normal characters, the main
// difference are the special checks when calculating the row.fill // difference are the special checks when calculating the row.fill