* Replace the truncate_string() helper function with a new, simplified version.

* Remove no longer necessary support functions.
* The new version uses a single BString as input/output parameter and only
  modifies that one by removing non-fitting chars and inserting the ellipsis
  where appropriate, so avoids copying around bytes/chars/strings in a few
  places. It uses the new Chars functions of BString so also no need for manual
  multibyte handling.
* Adjusted the BFont and ServerFont usage of truncate_string() which are both
  simplified by using the single BString. It avoids a lot of temprary
  allocations and string copying. The char * version of BFont
  GetTruncatedStrings() now uses the BString version and not the other way
  around anymore which requires us to allocate temporary BString objects, it's
  not worse than before though.
* This fixes a bunch of problems with the previous functions like always
  prepending the ellipsis for B_TRUNCATE_BEGINNING, crashing on short enough
  widths, violating the width in the B_TRUNCATE_END case when the width was
  short enough, non-optimal truncation in a few cases and sometimes truncation
  where none would've been needed. Also fixes #4128 which was a symptom of the
  broken B_TRUNCATE_BEGINNING.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35381 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/interface/truncate_string.h

@@ -1,22 +1,14 @@
 /*
- * Copyright 2005, Stephan Aßmus <[email protected]>. All rights reserved.
+ * Copyright 2010, Michael Lotz <[email protected]>. All rights reserved.
  * Distributed under the terms of the MIT License.
- *
- * a helper function to truncate strings
- *
  */
-
-
 #ifndef TRUNCATE_STRING_H
 #define TRUNCATE_STRING_H
 
 #include <SupportDefs.h>
 
-// truncated_string
-void
-truncate_string(const char* string,
-				uint32 mode, float width, char* result,
-				const float* escapementArray, float fontSize,
-				float ellipsisWidth, int32 length, int32 numChars);
+void truncate_string(BString& string, uint32 mode, float width,
+	const float* escapementArray, float fontSize, float ellipsisWidth,
+	int32 numChars);
 
-#endif // STRING_TRUNCATION_H
+#endif // TRUNCATE_STRING_H