beginsTag
public boolean beginsTag(TextTag tag)
Returns TRUE if tag is toggled on at exactly this point. Note that this
returns TRUE if iter is the start of the tagged range;
hasTag(TextTag)
tells you whether an iterator is within a tagged range.
tag
- A TextTag
- Whether iter is the start of a range tagged with tag
cmp
public int cmp(TextIter other)
A qsort()-style function that returns negative if lhs is less than rhs,
positive if lhs is greater than rhs, and 0 if they're equal. Ordering is
in character offset order, i.e. the first character in the buffer is less
than the second character in the buffer.
other
- Iterator to test
- -1 if lhs is less than rhs, 1 if lhs is greater, 0 if they are equal
endsTag
public boolean endsTag(TextTag tag)
Returns TRUE if tag is toggled off at exactly this point. Note that this
returns TRUE if iter is the end of the tagged range;
hasTag(TextTag)
tells you whether an iterator is within a tagged range.
tag
- A TextTag
- Whether iter is the end of a range tagged with tag
equals
public boolean equals(TextIter other)
Tests whether two iterators are equal, using the fastest possible
mechanism. This function is very fast; you can expect it to perform
better than e.g. getting the character offset for each iterator and
comparing the offsets yourself.
other
- Iterator to test
- TRUE if the iterators point to the same place in the buffer
getAttributes
public boolean getAttributes(TextAttributes values)
Computes the effect of any tags applied to this spot in the text. The
values parameter should be initialized to the default settings you wish
to use if no tags are in effect. You'd typically obtain the defaults from
TextView.getDefaultAttributes()
.
This will modify values, applying the effects of any tags present at
iter. If any tags affected values, the function returns TRUE.
values
- A TextAttributes to be filled in
- TRUE if values was modified
getBuffer
public TextBuffer getBuffer()
Returns the associated buffer
- associated buffer
getCanInsert
public boolean getCanInsert(boolean defaultSetting)
Considering the default editability of the buffer, and tags that affect
editability, determines whether text inserted at iter would be editable.
If text inserted at iter would be editable then the user should be
allowed to insert text at iter.
defaultSetting
- TRUE if text is editable by default
- Whether text inserted at iter would be editable
getChar
public char getChar()
Returns the Unicode character at this iterator. (Equivalent to operator*
on a C++ iterator.) If the iterator points at a non-character element,
such as an image embedded in the buffer, the Unicode "unknown" character
0xFFFC is returned. If invoked on the end iterator, zero is returned;
zero is not a valid Unicode character.
- a Unicode character, or 0 if iter is not dereferenceable
getCharsInLine
public int getCharsInLine()
Returns the number of characters in the line containing iter, including
the paragraph delimiters.
getChildAnchor
public TextChildAnchor getChildAnchor()
If the location pointed to by iter contains a child anchor, the anchor is
returned (with no new reference count added). Otherwise,
null
is returned.
getEditable
public boolean getEditable(boolean defaultSetting)
Returns whether the character at iter is within an editable region of
text. Non-editable text is "locked" and can't be changed by the user via
GtkTextView. If no tags applied to this text affect editability,
defaultSetting
will be returned.
You don't want to use this function to decide whether text can be
inserted at iter, because for insertion you don't want to know whether
the char at iter is inside an editable range, you want to know whether a
new character inserted at iter would be inside an editable range. Use
getCanInsert(boolean)
to handle this case.
defaultSetting
- TRUE if text is editable by default
- Whether iter is inside an editable range
getEndsLine
public boolean getEndsLine()
Returns TRUE if iter points to the start of the paragraph delimiter
characters for a line (delimiters will be either a newline, a carriage
return, a carriage return followed by a newline, or a Unicode paragraph
separator character). Note that an iterator pointing to the \n of a \r\n
pair will not be counted as the end of a line, the line ends before the
\r. The end iterator is considered to be at the end of a line, even
though there are no paragraph delimiter chars there.
getEndsSentence
public boolean getEndsSentence()
Determines whether iter ends a sentence. Sentence boundaries are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango text boundary algorithms).
getEndsWord
public boolean getEndsWord()
Determines whether iter ends a natural-language word. Word breaks are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango word break algorithms).
getInsideSentence
public boolean getInsideSentence()
Determines whether iter is inside a sentence (as opposed to
in between two sentences, eg after a period and before the
first letter of the next sentence). Sentence boundaries are
determined by Pango and should be correct for nearly any
language (if not, the correct fix would be to the Pango
text boundary algorithms).
getInsideWord
public boolean getInsideWord()
Determines whether iter is inside a natural-language word (as opposed to
say inside some whitespace). Word breaks are determined by Pango and
should be correct for nearly any language (if not, the correct fix would
be to the Pango word break algorithms).
getIsCursorPosition
public boolean getIsCursorPosition()
- TRUE if the cursor can be placed at iter
getIsEndIter
public boolean getIsEndIter()
Returns TRUE if iter is the end iterator, ie one past the last
dereferenceable iterator in the buffer. This is the most efficient way to
check whether an iterator is the end iterator.
getIsStartIter
public boolean getIsStartIter()
Returns TRUE if iter is the first iterator in the buffer, that is if iter
has a character offset of 0.
getLanguage
public Language getLanguage()
A convenience wrapper which returns the language in effect at iter. If no
tags affecting language apply to iter, the return value is identical to
that of gtk_get_default_language().
getLineNumber
public int getLineNumber()
Returns the line number containing the iterator. Lines in a GtkTextBuffer
are numbered beginning with 0 for the first line in the buffer.
- the line number.
getLineOffset
public int getLineOffset()
Returns the character offset of the iterator, counting from the start of
a newline-terminated line. The first character on the line has offset 0.
- Character offset from start of line.
getOffset
public int getOffset()
Returns the character offset of an iterator. Each character in a
GtkTextBuffer has an offset, starting with 0 for the first character in
the buffer.
getPixbuf
public Pixbuf getPixbuf()
If the location pointed to by iter contains a pixbuf, the pixbuf is
returned (with no new reference count added). Otherwise,
null
is returned.
getStartsLine
public boolean getStartsLine()
Returns TRUE if iter begins a paragraph, ie if
getLineOffset()
would return 0. However this function is potentially more efficient than
getLineOffset()
because it doesn't have to compute the offset,
it just has to see whether it's 0.
getStartsSentence
public boolean getStartsSentence()
Determines whether iter begins a sentence. Sentence boundaries are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango text boundary algorithms).
getStartsWord
public boolean getStartsWord()
Determines whether iter begins a natural-language word. Word breaks are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango word break algorithms).
getVisibleLineOffset
public int getVisibleLineOffset()
Returns the offset in characters from the start of the line to the given
iter, not counting characters that are invisible due to tags with the
"invisible" flag toggled on.
gtk_text_iter_backward_char
protected static final boolean gtk_text_iter_backward_char(Handle iter)
gtk_text_iter_backward_chars
protected static final boolean gtk_text_iter_backward_chars(Handle iter,
int count)
gtk_text_iter_backward_cursor_position
protected static final boolean gtk_text_iter_backward_cursor_position(Handle iter)
gtk_text_iter_backward_cursor_positions
protected static final boolean gtk_text_iter_backward_cursor_positions(Handle iter,
int count)
gtk_text_iter_backward_line
protected static final boolean gtk_text_iter_backward_line(Handle iter)
gtk_text_iter_backward_lines
protected static final boolean gtk_text_iter_backward_lines(Handle iter,
int count)
gtk_text_iter_backward_search
protected static final boolean gtk_text_iter_backward_search(Handle iter,
String str,
int flags,
Handle matchStart,
Handle matchEnd,
Handle limit)
gtk_text_iter_backward_sentence_start
protected static final boolean gtk_text_iter_backward_sentence_start(Handle iter)
gtk_text_iter_backward_sentence_starts
protected static final boolean gtk_text_iter_backward_sentence_starts(Handle iter,
int count)
gtk_text_iter_backward_to_tag_toggle
protected static final boolean gtk_text_iter_backward_to_tag_toggle(Handle iter,
Handle tag)
gtk_text_iter_backward_word_start
protected static final boolean gtk_text_iter_backward_word_start(Handle iter)
gtk_text_iter_backward_word_starts
protected static final boolean gtk_text_iter_backward_word_starts(Handle iter,
int count)
gtk_text_iter_begins_tag
protected static final boolean gtk_text_iter_begins_tag(Handle iter,
Handle tag)
gtk_text_iter_can_insert
protected static final boolean gtk_text_iter_can_insert(Handle iter,
boolean defaultEditablity)
gtk_text_iter_compare
protected static final int gtk_text_iter_compare(Handle lhs,
Handle rhs)
gtk_text_iter_copy
protected static final Handle gtk_text_iter_copy(Handle iter)
gtk_text_iter_editable
protected static final boolean gtk_text_iter_editable(Handle iter,
boolean defaultSetting)
gtk_text_iter_ends_line
protected static final boolean gtk_text_iter_ends_line(Handle iter)
gtk_text_iter_ends_sentence
protected static final boolean gtk_text_iter_ends_sentence(Handle iter)
gtk_text_iter_ends_tag
protected static final boolean gtk_text_iter_ends_tag(Handle iter,
Handle tag)
gtk_text_iter_ends_word
protected static final boolean gtk_text_iter_ends_word(Handle iter)
gtk_text_iter_equal
protected static final boolean gtk_text_iter_equal(Handle lhs,
Handle rhs)
gtk_text_iter_forward_char
protected static final boolean gtk_text_iter_forward_char(Handle iter)
gtk_text_iter_forward_chars
protected static final boolean gtk_text_iter_forward_chars(Handle iter,
int count)
gtk_text_iter_forward_cursor_position
protected static final boolean gtk_text_iter_forward_cursor_position(Handle iter)
gtk_text_iter_forward_cursor_positions
protected static final boolean gtk_text_iter_forward_cursor_positions(Handle iter,
int count)
gtk_text_iter_forward_line
protected static final boolean gtk_text_iter_forward_line(Handle iter)
gtk_text_iter_forward_lines
protected static final boolean gtk_text_iter_forward_lines(Handle iter,
int count)
gtk_text_iter_forward_search
protected static final boolean gtk_text_iter_forward_search(Handle iter,
String str,
int flags,
Handle matchStart,
Handle matchEnd,
Handle limit)
gtk_text_iter_forward_sentence_end
protected static final boolean gtk_text_iter_forward_sentence_end(Handle iter)
gtk_text_iter_forward_sentence_ends
protected static final boolean gtk_text_iter_forward_sentence_ends(Handle iter,
int count)
gtk_text_iter_forward_to_end
protected static final void gtk_text_iter_forward_to_end(Handle iter)
gtk_text_iter_forward_to_line_end
protected static final boolean gtk_text_iter_forward_to_line_end(Handle iter)
gtk_text_iter_forward_to_tag_toggle
protected static final boolean gtk_text_iter_forward_to_tag_toggle(Handle iter,
Handle tag)
gtk_text_iter_forward_word_end
protected static final boolean gtk_text_iter_forward_word_end(Handle iter)
gtk_text_iter_forward_word_ends
protected static final boolean gtk_text_iter_forward_word_ends(Handle iter,
int count)
gtk_text_iter_free
protected static final void gtk_text_iter_free(Handle iter)
gtk_text_iter_get_attributes
protected static final boolean gtk_text_iter_get_attributes(Handle iter,
Handle values)
gtk_text_iter_get_buffer
protected static final Handle gtk_text_iter_get_buffer(Handle iter)
gtk_text_iter_get_bytes_in_line
protected static final int gtk_text_iter_get_bytes_in_line(Handle iter)
gtk_text_iter_get_char
protected static final char gtk_text_iter_get_char(Handle iter)
gtk_text_iter_get_chars_in_line
protected static final int gtk_text_iter_get_chars_in_line(Handle iter)
gtk_text_iter_get_child_anchor
protected static final Handle gtk_text_iter_get_child_anchor(Handle iter)
gtk_text_iter_get_language
protected static final Handle gtk_text_iter_get_language(Handle iter)
gtk_text_iter_get_line
protected static final int gtk_text_iter_get_line(Handle iter)
gtk_text_iter_get_line_index
protected static final int gtk_text_iter_get_line_index(Handle iter)
gtk_text_iter_get_line_offset
protected static final int gtk_text_iter_get_line_offset(Handle iter)
gtk_text_iter_get_offset
protected static final int gtk_text_iter_get_offset(Handle iter)
gtk_text_iter_get_pixbuf
protected static final Handle gtk_text_iter_get_pixbuf(Handle iter)
gtk_text_iter_get_slice
protected static final String gtk_text_iter_get_slice(Handle start,
Handle end)
gtk_text_iter_get_text
protected static final String gtk_text_iter_get_text(Handle start,
Handle end)
gtk_text_iter_get_visible_line_index
protected static final int gtk_text_iter_get_visible_line_index(Handle iter)
gtk_text_iter_get_visible_line_offset
protected static final int gtk_text_iter_get_visible_line_offset(Handle iter)
gtk_text_iter_get_visible_slice
protected static final String gtk_text_iter_get_visible_slice(Handle start,
Handle end)
gtk_text_iter_get_visible_text
protected static final String gtk_text_iter_get_visible_text(Handle start,
Handle end)
gtk_text_iter_has_tag
protected static final boolean gtk_text_iter_has_tag(Handle iter,
Handle tag)
gtk_text_iter_in_range
protected static final boolean gtk_text_iter_in_range(Handle iter,
Handle start,
Handle end)
gtk_text_iter_inside_sentence
protected static final boolean gtk_text_iter_inside_sentence(Handle iter)
gtk_text_iter_inside_word
protected static final boolean gtk_text_iter_inside_word(Handle iter)
gtk_text_iter_isChildAnchor
protected static final boolean gtk_text_iter_isChildAnchor(Handle handle)
gtk_text_iter_isPixbuf
protected static final boolean gtk_text_iter_isPixbuf(Handle handle)
gtk_text_iter_is_cursor_position
protected static final boolean gtk_text_iter_is_cursor_position(Handle iter)
gtk_text_iter_is_end
protected static final boolean gtk_text_iter_is_end(Handle iter)
gtk_text_iter_is_start
protected static final boolean gtk_text_iter_is_start(Handle iter)
gtk_text_iter_order
protected static final void gtk_text_iter_order(Handle first,
Handle second)
gtk_text_iter_set_line
protected static final void gtk_text_iter_set_line(Handle iter,
int lineNumber)
gtk_text_iter_set_line_index
protected static final void gtk_text_iter_set_line_index(Handle iter,
int byteOnLine)
gtk_text_iter_set_line_offset
protected static final void gtk_text_iter_set_line_offset(Handle iter,
int charOnLine)
gtk_text_iter_set_offset
protected static final void gtk_text_iter_set_offset(Handle iter,
int charOffset)
gtk_text_iter_set_visible_line_index
protected static final void gtk_text_iter_set_visible_line_index(Handle iter,
int byteOnLine)
gtk_text_iter_set_visible_line_offset
protected static final void gtk_text_iter_set_visible_line_offset(Handle iter,
int charOnLine)
gtk_text_iter_starts_line
protected static final boolean gtk_text_iter_starts_line(Handle iter)
gtk_text_iter_starts_sentence
protected static final boolean gtk_text_iter_starts_sentence(Handle iter)
gtk_text_iter_starts_word
protected static final boolean gtk_text_iter_starts_word(Handle iter)
gtk_text_iter_toggles_tag
protected static final boolean gtk_text_iter_toggles_tag(Handle iter,
Handle tag)
hasTag
public boolean hasTag(TextTag tag)
Returns TRUE if iter is within a range tagged with tag.
- whether iter is tagged with tag
inRange
public boolean inRange(TextIter start,
TextIter end)
Checks whether iter falls in the range [start, end). The start and end must
be in ascending order.
start
- Start of rangeend
- End of range
- TRUE if iter is in the range
isChildAnchor
public boolean isChildAnchor()
Returns true is this location is a child anchor.
isPixbuf
public boolean isPixbuf()
Returns true if iter points to a pixbuf.
moveBackwardChar
public boolean moveBackwardChar()
Moves backward by one character offset. Returns TRUE if movement was
possible; if iter was the first in the buffer (character offset 0),
gtk_text_iter_backward_char() returns FALSE for convenience when writing
loops.
moveBackwardChar
public boolean moveBackwardChar(int count)
Moves count characters backward, if possible (if count would move past
the start or end of the buffer, moves to the start or end of the buffer).
The return value indicates whether the iterator moved onto a
dereferenceable position; if the iterator didn't move, or moved onto the
end iterator, then FALSE is returned. If count is 0, the function does
nothing and returns FALSE.
count
- Number of characters to move
- Whether iter moved and is dereferenceable
moveBackwardCursorPosition
public boolean moveBackwardCursorPosition()
moveBackwardCursorPosition
public boolean moveBackwardCursorPosition(int count)
moveBackwardLine
public boolean moveBackwardLine()
Moves iter to the start of the previous line. Returns TRUE if iter could
be moved; i.e. if iter was at character offset 0, this function returns
FALSE. Therefore if iter was already on line 0, but not at the start of
the line, iter is snapped to the start of the line and the function
returns TRUE. (Note that this implies that in a loop calling this
function, the line number may not change on every iteration, if your
first iteration is on line 0.)
moveBackwardLine
public boolean moveBackwardLine(int count)
Moves count lines backward, if possible (if count would move past the
start or end of the buffer, moves to the start or end of the buffer). The
return value indicates whether the iterator moved onto a dereferenceable
position; if the iterator didn't move, or moved onto the end iterator,
then FALSE is returned. If count is 0, the function does nothing and
returns FALSE. If count is negative, moves forward by 0 - count lines.
moveBackwardSentenceStart
public boolean moveBackwardSentenceStart()
Moves backward to the previous sentence start; if iter is already at the
start of a sentence, moves backward to the next one. Sentence boundaries
are determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango text boundary algorithms).
moveBackwardSentenceStart
public boolean moveBackwardSentenceStart(int count)
Calls
moveBackwardSentenceStart()
up to
count
times, or until it returns FALSE. If count is negative, moves forward
instead of backward.
moveBackwardToggle
public boolean moveBackwardToggle(TextTag tag)
Moves backward to the next toggle (on or off) of the TextTag
tag
. If no matching tag toggles are found, returns FALSE,
otherwise TRUE. Does not return toggles located at iter, only toggles
before iter. Sets iter to the location of the toggle, or the start of the
buffer if no toggle is found.
moveBackwardWordStart
public boolean moveBackwardWordStart()
Moves backward to the previous word start. (If iter is currently on a
word start, moves backward to the next one after that.) Word breaks are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango word break algorithms).
moveBackwardWordStart
public boolean moveBackwardWordStart(int count)
moveForwardChar
public boolean moveForwardChar()
Moves iter forward by one character offset. Note that images embedded in
the buffer occupy 1 character slot, so gtk_text_iter_forward_char() may
actually move onto an image instead of a character, if you have images in
your buffer. If iter is the end iterator or one character before it, iter
will now point at the end iterator, and gtk_text_iter_forward_char()
returns FALSE for convenience when writing loops.
moveForwardChar
public boolean moveForwardChar(int count)
Moves count characters if possible (if count would move past the start or
end of the buffer, moves to the start or end of the buffer). The return
value indicates whether the new position of iter is different from its
original position, and dereferenceable (the last iterator in the buffer
is not dereferenceable). If count is 0, the function does nothing and
returns FALSE.
count
- Number of characters to move, may be negative
- Whether iter moved and is dereferenceable
moveForwardCursorPosition
public boolean moveForwardCursorPosition()
Moves iter forward by a single cursor position. Cursor positions are
(unsurprisingly) positions where the cursor can appear. Perhaps
surprisingly, there may not be a cursor position between all characters.
The most common example for European languages would be a carriage
return/newline sequence. For some Unicode characters, the equivalent of
say the letter "a" with an accent mark will be represented as two
characters, first the letter then a "combining mark" that causes the
accent to be rendered; so the cursor can't go between those two
characters. See also the PangoLogAttr structure and pango_break()
function.
moveForwardCursorPosition
public boolean moveForwardCursorPosition(int count)
moveForwardLine
public boolean moveForwardLine()
Moves iter to the start of the next line. Returns TRUE if there was a
next line to move to, and FALSE if iter was simply moved to the end of
the buffer and is now not dereferenceable, or if iter was already at the
end of the buffer.
moveForwardLine
public boolean moveForwardLine(int count)
Moves count lines forward, if possible (if count would move past the
start or end of the buffer, moves to the start or end of the buffer). The
return value indicates whether the iterator moved onto a dereferenceable
position; if the iterator didn't move, or moved onto the end iterator,
then FALSE is returned. If count is 0, the function does nothing and
returns FALSE. If count is negative, moves backward by 0 - count lines.
moveForwardSentenceEnd
public boolean moveForwardSentenceEnd()
Moves forward to the next sentence end. (If iter is at the end of a
sentence, moves to the next end of sentence.) Sentence boundaries are
determined by Pango and should be correct for nearly any language (if
not, the correct fix would be to the Pango text boundary algorithms).
moveForwardSentenceEnd
public boolean moveForwardSentenceEnd(int count)
Calls
moveForwardSentenceEnd()
count
times (or
until it returns FALSE). If count is negative, moves backward instead of
forward.
moveForwardToggle
public boolean moveForwardToggle(TextTag tag)
Moves forward to the next toggle (on or off) of the TextTag
tag
. If no matching tag toggles are found, returns FALSE,
otherwise TRUE. Does not return toggles located at iter, only toggles
after iter. Sets iter to the location of the toggle, or to the end of the
buffer if no toggle is found.
moveForwardWordEnd
public boolean moveForwardWordEnd()
Moves forward to the next word end. (If iter is currently on a word end,
moves forward to the next one after that.) Word breaks are determined by
Pango and should be correct for nearly any language (if not, the correct
fix would be to the Pango word break algorithms).
moveForwardWordEnd
public boolean moveForwardWordEnd(int count)
moveToEnd
public void moveToEnd()
Moves iter forward to the "end iterator," which points one past the last
valid character in the buffer.
getChar()
called on the end
iterator returns 0, which is convenient for writing loops.
moveToLineEnd
public boolean moveToLineEnd()
Moves the iterator to point to the paragraph delimiter characters, which
will be either a newline, a carriage return, a carriage return/newline in
sequence, or the Unicode paragraph separator character. If the iterator
is already at the paragraph delimiter characters, moves to the paragraph
delimiter characters for the next line. If iter is on the last line in
the buffer, which does not end in paragraph delimiters, moves to the end
iterator (end of the last line), and returns FALSE.
searchBackward
public boolean searchBackward(String str,
TextSearchFlags flags,
TextIter matchStart,
TextIter matchEnd,
TextIter limit)
str
- A search stringflags
- Flags affecting how the search is donematchStart
- Return location for start of matchmatchEnd
- Return location for end of matchlimit
- Bound for the searchof the buffer
- Whether a match was found
searchForward
public boolean searchForward(String str,
TextSearchFlags flags,
TextIter matchStart,
TextIter matchEnd,
TextIter limit)
Searches forward for
str
. Any match is returned by setting
matchStart
to the first character of the match and
matchEnd
to the first character after the match. The search
will not continue past limit. Note that a search is a linear or O(n)
operation, so you may wish to use limit to avoid locking up your UI on
large buffers.
If the TextSearchFlags.VISIBLE flag is present, the match may have
invisible text interspersed in str. i.e. str will be a
possibly-noncontiguous subsequence of the matched range. similarly, if
you specify TextSeachFlags.ONLY, the match may have pixbufs or child
widgets mixed inside the matched range. If these flags are not given, the
match must be exact; the special 0xFFFC character in str will match
embedded pixbufs or child widgets.
str
- A search stringflags
- Flags affecting how the search is donematchStart
- Return location for start of matchmatchEnd
- Return location for end of matchlimit
- Bound for the searchof the buffer
- Whether a match was found
setCharOffset
public void setCharOffset(int charOffset)
Sets iter to point to charOffset
. The charOffset counts from the
start of the entire text buffer, starting with 0.
setLine
public void setLine(int lineNumber)
Moves iterator iter to the start of the line lineNumber
. If
lineNumber is negative or larger than the number of lines in the buffer,
moves iter to the start of the last line in the buffer.
setLineOffset
public void setLineOffset(int charOnLine)
Moves iter within a line, to a new character (not byte) offset. The given
character offset must be less than or equal to the number of characters
in the line; if equal, iter moves to the start of the next line.
setVisibleLineOffset
public void setVisibleLineOffset(int charOnLine)
Like
setLineOffset(int)
, but the offset is in visible
characters, ie text with a tag making it invisible is not counted in
the offset.