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Graphics.UI.Gtk.Multiline.TextIter | Portability | portable (depends on GHC) | Stability | provisional | Maintainer | gtk2hs-users@lists.sourceforge.net |
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Description |
An iterator is an abstract datatype representing a pointer into a
TextBuffer.
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Synopsis |
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Types
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Specify the way the search function for
Graphics.UI.Gtk.Multiline.TextBuffer works.
| Constructors | TextSearchVisibleOnly | | TextSearchTextOnly | |
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Methods
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Copy the iterator.
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Return the TextBuffer this iterator
is associated with.
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Returns the character offset of an iterator. Each character in a
TextBuffer has an offset, starting with 0 for the first character in the
buffer. Use Graphics.UI.Gtk.Multiline.TextBuffer.textBufferGetIterAtOffset
to convert an offset back into an iterator.
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Returns the line number containing the iterator. Lines in a TextBuffer
are numbered beginning with 0 for the first line in the buffer.
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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.
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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.
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Returns the Unicode character at this iterator.
If the element at this iterator is 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,
Nothigng is returned.
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Returns the text in the given range. A "slice" is a list of
characters, including the Unicode "unknown"
character 0xFFFC for iterable non-character elements in the buffer, such as
images. Because images are encoded in the slice, offsets
in the returned array will correspond to offsets in the text buffer.
Note that 0xFFFC can occur in normal text as well, so it is not a reliable
indicator that a pixbuf or widget is in the buffer.
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Return the text in a given range.
- Pictures (and other objects) are stripped form the output. Thus, this
function does not preserve offsets.
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Like textIterGetSlice, but invisible text is not included. Invisible
text is usually invisible because a TextTag with the "invisible"
attribute turned on has been applied to it.
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Like textIterGetText, but invisible text is not included. Invisible
text is usually invisible because a TextTag with the "invisible"
attribute turned on has been applied to it.
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Get the Pixbuf under the iterator.
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If the location at iter contains a child anchor,
the anchor is returned (with no new reference count added).
Otherwise, Nothing is returned.
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:: TextIter | | -> IO [TextMark] | returns list of TextMark
| Returns a list of all TextMark at this location. Because marks are not
iterable (they don't take up any "space" in the buffer, they are just
marks in between iterable locations), multiple marks can exist in the same
place. The returned list is not in any meaningful order.
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:: TextIter | | -> Bool | toggledOn - True to get toggled-on tags
| -> IO [TextTag] | returns tags toggled at this point
| Returns a list of TextTag that are toggled on or off at this point. (If
toggledOn is True, the list contains tags that are toggled on.) If a tag
is toggled on at iter, then some non-empty range of characters following
iter has that tag applied to it. If a tag is toggled off, then some
non-empty range following iter does not have the tag applied to it.
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Returns True if tag is toggled on at exactly this point. If tag is
Nothing,
returns True if any tag is toggled on at this point. Note that the
textIterBeginsTag returns True if iter is the start of the tagged
range; textIterHasTag tells you whether an iterator is within a tagged
range.
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Returns True if tag is toggled off at exactly this point. If tag is
Notihng,
returns True if any tag is toggled off at this point. Note that the
textIterEndsTag returns True if iter is the end of the tagged range;
textIterHasTag tells you whether an iterator is within a tagged range.
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Query if the TextIter is at the
beginning or the end of a TextTag. This is equivalent to
(textIterBeginsTag || textIterEndsTag), i.e. it
tells you whether a range with tag applied to it begins or ends at
iter.
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Check if TextIter is within a range
tagged with tag.
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:: TextIter | | -> IO [TextTag] | returns list of TextTag
| Returns a list of tags that apply to iter, in ascending order of
priority (highest-priority tags are last).
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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
TextView. This function is simply a convenience wrapper around
textIterGetAttributes. 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
textIterCanInsert to handle this case.
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Check if new text can be inserted at TextIter.
- 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.
Graphics.UI.Gtk.Multiline.TextBuffer.textBufferInsertInteractive
uses this function
to decide whether insertions are allowed at a given position.
- Use Graphics.UI.Gtk.Multiline.TextBuffer.textBufferInsertInteractive
if you want to insert text depending on the current editable status.
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Determine if TextIter begins a new
natural-language word.
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Determine if TextIter ends a new
natural-language word.
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Determine if TextIter is inside a
word.
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Determine if TextIter begins a new
line.
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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 rn
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.
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Determine if TextIter starts a
sentence.
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Determine if TextIter ends a
sentence.
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Determine if TextIter is inside
a sentence.
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Determine if TextIter is at a
cursor position.
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Return number of characters in this line.
- The return value includes delimiters.
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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 textViewGetDefaultAttributes.
textIterGetAttributes will modify values, applying the effects of any tags present at iter.
If any tags affected values, the function returns True.
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A convenience wrapper around textIterGetAttributes, which returns the language in effect at iter.
If no tags affecting language apply to iter, the return value is identical to that of getDefaultLanguage.
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Determine if TextIter is at the end of
the buffer.
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Determine if TextIter is at the
beginning of the buffer.
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Move TextIter forwards.
- Retuns True if the iterator is pointing to a character.
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Move TextIter backwards.
- Retuns True if the movement was possible.
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Move TextIter forwards by
n characters.
- Retuns True if the iterator is pointing to a new character (and False if
the iterator points to a picture or has not moved).
- Note that images embedded
in the buffer occupy 1 character slot, so textIterForwardChar may actually
move onto an image instead of a character.
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Move TextIter backwards by
n characters.
- Retuns True if the iterator is pointing to a new character (and False if
the iterator points to a picture or has not moved).
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Move TextIter forwards.
- Retuns True if the iterator is pointing to a new line (and False if the
iterator points to a picture or has not moved).
- If TextIter is on the first line, it will be moved to the
beginning of the buffer.
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Move TextIter backwards.
- Retuns True if the iterator is pointing to a new line (and False if the
iterator points to a picture or has not moved).
- If TextIter is on the first line, it will be moved to the end
of the buffer.
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Move TextIter forwards by
n lines.
- Retuns True if the iterator is pointing to a new line (and False if the
iterator points to a picture or has not moved).
- If TextIter is on the first line, it will be moved to the
beginning of the buffer.
- n can be negative.
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Move TextIter backwards by
n lines.
- Retuns True if the iterator is pointing to a new line (and False if the
iterator points to a picture or has not moved).
- If TextIter is on the first line, it will be moved to the end
of the buffer.
- n can be negative.
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Move TextIter forwards by
n word ends.
- Retuns True if the iterator is pointing to a new word end.
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Move TextIter backwards by
n word beginnings.
- Retuns True if the iterator is pointing to a new word start.
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Move TextIter forwards to the
next word end.
- Retuns True if the iterator has moved to a new word end.
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Move TextIter backwards to
the next word beginning.
- Retuns True if the iterator has moved to a new word beginning.
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Move TextIter forwards to
the next cursor position.
- Some characters are composed of two Unicode codes. This function ensures
that TextIter does not point inbetween such double characters.
- Returns True if TextIter moved and points to a character (not
to an object).
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Move TextIter backwards
to the next cursor position.
- Some characters are composed of two Unicode codes. This function ensures
that TextIter does not point inbetween such double characters.
- Returns True if TextIter moved and points to a character (not
to an object).
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Move TextIter forwards
by n cursor positions.
- Returns True if TextIter moved and points to a character (not
to an object).
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Move TextIter backwards
by n cursor positions.
- Returns True if TextIter moved and points to a character (not
to an object).
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Move TextIter forwards by
n sentence ends.
- Retuns True if the iterator is pointing to a new sentence end.
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Move TextIter backwards
by n sentence beginnings.
- Retuns True if the iterator is pointing to a new sentence start.
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Move TextIter forwards to
the next sentence end.
- Retuns True if the iterator has moved to a new sentence end.
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Move TextIter backwards
to the next sentence beginning.
- Retuns True if the iterator has moved to a new sentence beginning.
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Set TextIter to an offset within the
buffer.
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Set TextIter to a line within the
buffer.
- If number is negative or larger than the number of lines in the buffer,
moves iter to the start of the last line in the buffer.
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Set TextIter to an offset within the line.
- The
given character offset must be less than or equal to the number of
characters in the line; if equal, the iterator moves to the start of the
next line.
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Like textIterSetLineOffset, but the offset is in visible characters,
i.e. text with a tag making it invisible is not counted in the offset.
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Moves iter forward to the "end iterator," which points one past the
last valid character in the buffer.
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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.
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Moves TextIter forward to
the next change of a TextTag.
- If Nothing is supplied, any TextTag will be matched.
- Returns True if there was a tag toggle after TextIter.
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Moves TextIter backward to
the next change of a TextTag.
- If Nothing is supplied, any TextTag will be matched.
- Returns True if there was a tag toggle before TextIter.
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Move TextIter forward until a
predicate function returns True.
- If pred returns True before limit is reached, the
search is stopped and the return value is True.
- If limit is Nothing, the search stops at the end of the buffer.
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Move TextIter backward until a
predicate function returns True.
- If pred returns True before limit is reached, the
search is stopped and the return value is True.
- If limit is Nothing, the search stops at the end of the buffer.
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Search forward for a specific string.
- If specified, the last character which is tested against that start of
the search pattern will be limit.
- TextSearchFlags may be empty.
- Returns the start and end position of the string found.
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Search backward for a specific string.
- If specified, the last character which is tested against that start of
the search pattern will be limit.
- TextSearchFlags my be empty.
- Returns the start and end position of the string found.
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Compare two TextIter for equality.
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Compare two TextIter.
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:: TextIter | | -> TextIter | start start of range
| -> TextIter | end end of range
| -> IO Bool | True if iter is in the range
| Checks whether iter falls in the range [start, end).
start and end must be in ascending order.
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Swaps the value of first and second if second comes before first in the buffer.
That is, ensures that first and second are in sequence.
Most text buffer functions that take a range call this automatically on your behalf, so there's no real reason to call it yourself in those cases.
There are some exceptions, such as textIterInRange, that expect a pre-sorted range.
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textIterForwardVisibleLine | Source |
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:: TextIter | | -> IO Bool | returns whether iter can be dereferenced
| Moves iter to the start of the next visible 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.
- Available since Gtk+ version 2.8
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textIterBackwardVisibleLine | Source |
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:: TextIter | | -> IO Bool | returns whether iter moved
| Moves iter to the start of the previous visible 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.)
- Available since Gtk+ version 2.8
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textIterForwardVisibleLines | Source |
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:: TextIter | | -> Int | count - number of lines to move forward
| -> IO Bool | returns whether iter moved and is dereferenceable
| Moves count visible 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.
- Available since Gtk+ version 2.8
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textIterBackwardVisibleLines | Source |
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:: TextIter | | -> Int | count - number of lines to move backward
| -> IO Bool | returns whether iter moved and is dereferenceable
| Moves count visible 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.
- Available since Gtk+ version 2.8
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textIterForwardVisibleWordEnds | Source |
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textIterBackwardVisibleWordStarts | Source |
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textIterForwardVisibleWordEnd | Source |
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:: TextIter | | -> IO Bool | return True if iter moved and is not the end iterator
| Moves forward to the next visible 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).
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textIterBackwardVisibleWordStart | Source |
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:: TextIter | | -> IO Bool | return True if iter moved and is not the end iterator
| Moves backward to the previous visible 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).
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textIterForwardVisibleCursorPosition | Source |
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textIterBackwardVisibleCursorPosition | Source |
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textIterForwardVisibleCursorPositions | Source |
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textIterBackwardVisibleCursorPositions | Source |
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Attributes
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'visibleLineOffset' property. See textIterGetVisibleLineOffset and
textIterSetVisibleLineOffset
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'offset' property. See textIterGetOffset and textIterSetOffset
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'lineOffset' property. See textIterGetLineOffset and
textIterSetLineOffset
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'line' property. See textIterGetLine and textIterSetLine
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Produced by Haddock version 2.6.0 |