Remove non-copyable idioms

[lyx.git] / src / support / lstrings.h

diff --git a/src/support/lstrings.h b/src/support/lstrings.h
index 0d21e954a4308600bce39a3e81dc469256fc32c9..ac310c59c43dcc598e6a6016c447e91a0bc274d2 100644 (file)
--- a/src/support/lstrings.h
+++ b/src/support/lstrings.h
@@ -266,6 +266,29 @@ docstring const rsplit(docstring const & a, char_type delim);
 /// problems in latex labels.
 docstring const escape(docstring const & lab);
 
+/// Truncates a string with an ellipsis at the end.  Leaves str unchanged and
+/// returns false if it is shorter than len. Otherwise resizes str to len, with
+/// U+2026 HORIZONTAL ELLIPSIS at the end, and returns true.
+///
+/// Warning (Unicode): The cases where we want to truncate the text and it does
+/// not end up converted into a QString for UI display must be really
+/// rare. Whenever possible, we should prefer calling QFontMetrics::elidedText()
+/// instead, which takes into account the actual length on the screen and the
+/// layout direction (RTL or LTR). Or a similar function taking into account the
+/// font metrics from the buffer view, which still has to be defined. Or set up
+/// the widgets such that Qt elides the string automatically with the exact
+/// needed width. Recall that not only graphemes vary greatly in width, but also
+/// can be made of several code points. See:
+/// <http://utf8everywhere.org/#myth.strlen>
+///
+/// What is acceptable is when we know that the string is probably going to be
+/// elided by Qt anyway, and len is chosen such that our own ellipsis will only
+/// be displayed in worst-case scenarios.
+///
+/// FIXME: apply those principles in the current code.
+/// 
+bool truncateWithEllipsis(docstring & str, size_t const len);
+
 /// Word-wraps the provided docstring, returning a line-broken string
 /// of width no wider than width, with the string broken at spaces. 
 /// If the string cannot be broken appropriately, it returns something 
@@ -274,6 +297,10 @@ docstring const escape(docstring const & lab);
 /// If indent is positive, then the first line is indented that many 
 /// spaces. If it is negative, then successive lines are indented, as
 /// if the first line were "outdented".
+///
+/// Warning (Unicode): uses truncateWithEllipsis() internally. Therefore it is
+/// subject to the same warning and FIXME as above.
+///
 docstring wrap(docstring const & str, int const indent = 0,
                size_t const width = 80);
 
@@ -281,6 +308,10 @@ docstring wrap(docstring const & str, int const indent = 0,
 /// that may contain embedded newlines.
 /// \param numlines Don't return more than numlines lines. If numlines
 ///    is 0, we return everything.
+///
+/// Warning (Unicode): uses truncateWithEllipsis() internally. Therefore it is
+/// subject to the same warning and FIXME as above.
+///
 docstring wrapParas(docstring const & str, int const indent = 0,
                     size_t const width = 80, size_t const maxlines = 10);
 
@@ -302,6 +333,15 @@ docstring const getStringFromVector(std::vector<docstring> const & vec,
 /// found, else -1. The last item in \p str must be "".
 int findToken(char const * const str[], std::string const & search_token);
 
+
+/// Format a floating point number with at least 6 siginificant digits, but
+/// without scientific notation.
+/// Scientific notation would be invalid in some contexts, such as lengths for
+/// LaTeX. Simply using std::ostream with std::fixed would produce results
+/// like "1000000.000000", and precision control would not be that easy either.
+std::string formatFPNumber(double);
+
+
 template <class Arg1>
 docstring bformat(docstring const & fmt, Arg1);
 
@@ -317,6 +357,9 @@ docstring bformat(docstring const & fmt, Arg1, Arg2, Arg3, Arg4);
 
 template<> docstring bformat(docstring const & fmt, int arg1);
 template<> docstring bformat(docstring const & fmt, long arg1);
+#ifdef LYX_USE_LONG_LONG
+template<> docstring bformat(docstring const & fmt, long long arg1);
+#endif
 template<> docstring bformat(docstring const & fmt, unsigned int arg1);
 template<> docstring bformat(docstring const & fmt, docstring arg1);
 template<> docstring bformat(docstring const & fmt, char * arg1);