## GtkTextBuffer GtkTextBuffer — Stores attributed text for display in a GtkTextView |

## Synopsis

    #include <gtk/gtk.h>

                GtkTextBuffer;
    GtkTextBuffer* gtk_text_buffer_new          (GtkTextTagTable *table);
    gint        gtk_text_buffer_get_line_count  (GtkTextBuffer *buffer);
    gint        gtk_text_buffer_get_char_count  (GtkTextBuffer *buffer);
    GtkTextTagTable* gtk_text_buffer_get_tag_table
                                                (GtkTextBuffer *buffer);
    void        gtk_text_buffer_insert          (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len);
    void        gtk_text_buffer_insert_at_cursor
                                                (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len);
    gboolean    gtk_text_buffer_insert_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 gboolean default_editable);
    gboolean    gtk_text_buffer_insert_interactive_at_cursor
                                                (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len,
                                                 gboolean default_editable);
    void        gtk_text_buffer_insert_range    (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    gboolean    gtk_text_buffer_insert_range_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean default_editable);
    void        gtk_text_buffer_insert_with_tags
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 GtkTextTag *first_tag,
                                                 ...);
    void        gtk_text_buffer_insert_with_tags_by_name
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 const gchar *first_tag_name,
                                                 ...);
    void        gtk_text_buffer_delete          (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);
    gboolean    gtk_text_buffer_delete_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *start_iter,
                                                 GtkTextIter *end_iter,
                                                 gboolean default_editable);
    gboolean    gtk_text_buffer_backspace       (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gboolean interactive,
                                                 gboolean default_editable);
    void        gtk_text_buffer_set_text        (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len);
    gchar*      gtk_text_buffer_get_text        (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean include_hidden_chars);
    gchar*      gtk_text_buffer_get_slice       (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean include_hidden_chars);
    void        gtk_text_buffer_insert_pixbuf   (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GdkPixbuf *pixbuf);
    void        gtk_text_buffer_insert_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextChildAnchor *anchor);
    GtkTextChildAnchor* gtk_text_buffer_create_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);
    GtkTextMark* gtk_text_buffer_create_mark    (GtkTextBuffer *buffer,
                                                 const gchar *mark_name,
                                                 const GtkTextIter *where,
                                                 gboolean left_gravity);
    void        gtk_text_buffer_move_mark       (GtkTextBuffer *buffer,
                                                 GtkTextMark *mark,
                                                 const GtkTextIter *where);
    void        gtk_text_buffer_move_mark_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *where);
    void        gtk_text_buffer_delete_mark     (GtkTextBuffer *buffer,
                                                 GtkTextMark *mark);
    void        gtk_text_buffer_delete_mark_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name);
    GtkTextMark* gtk_text_buffer_get_mark       (GtkTextBuffer *buffer,
                                                 const gchar *name);
    GtkTextMark* gtk_text_buffer_get_insert     (GtkTextBuffer *buffer);
    GtkTextMark* gtk_text_buffer_get_selection_bound
                                                (GtkTextBuffer *buffer);
    void        gtk_text_buffer_place_cursor    (GtkTextBuffer *buffer,
                                                 const GtkTextIter *where);
    void        gtk_text_buffer_select_range    (GtkTextBuffer *buffer,
                                                 const GtkTextIter *ins,
                                                 const GtkTextIter *bound);
    void        gtk_text_buffer_apply_tag       (GtkTextBuffer *buffer,
                                                 GtkTextTag *tag,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    void        gtk_text_buffer_remove_tag      (GtkTextBuffer *buffer,
                                                 GtkTextTag *tag,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    void        gtk_text_buffer_apply_tag_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    void        gtk_text_buffer_remove_tag_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    void        gtk_text_buffer_remove_all_tags (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);
    GtkTextTag* gtk_text_buffer_create_tag      (GtkTextBuffer *buffer,
                                                 const gchar *tag_name,
                                                 const gchar *first_property_name,
                                                 ...);
    void        gtk_text_buffer_get_iter_at_line_offset
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number,
                                                 gint char_offset);
    void        gtk_text_buffer_get_iter_at_offset
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint char_offset);
    void        gtk_text_buffer_get_iter_at_line
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number);
    void        gtk_text_buffer_get_iter_at_line_index
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number,
                                                 gint byte_index);
    void        gtk_text_buffer_get_iter_at_mark
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextMark *mark);
    void        gtk_text_buffer_get_iter_at_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextChildAnchor *anchor);
    void        gtk_text_buffer_get_start_iter  (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);
    void        gtk_text_buffer_get_end_iter    (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);
    void        gtk_text_buffer_get_bounds      (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);
    gboolean    gtk_text_buffer_get_modified    (GtkTextBuffer *buffer);
    void        gtk_text_buffer_set_modified    (GtkTextBuffer *buffer,
                                                 gboolean setting);
    gboolean    gtk_text_buffer_delete_selection
                                                (GtkTextBuffer *buffer,
                                                 gboolean interactive,
                                                 gboolean default_editable);
    void        gtk_text_buffer_paste_clipboard (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard,
                                                 GtkTextIter *override_location,
                                                 gboolean default_editable);
    void        gtk_text_buffer_copy_clipboard  (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);
    void        gtk_text_buffer_cut_clipboard   (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard,
                                                 gboolean default_editable);
    gboolean    gtk_text_buffer_get_selection_bounds
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);
    void        gtk_text_buffer_begin_user_action
                                                (GtkTextBuffer *buffer);
    void        gtk_text_buffer_end_user_action (GtkTextBuffer *buffer);
    void        gtk_text_buffer_add_selection_clipboard
                                                (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);
    void        gtk_text_buffer_remove_selection_clipboard
                                                (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);

## Object Hierarchy

      GObject
       +----GtkTextBuffer

## Properties

      "tag-table"            GtkTextTagTable       : Read / Write / Construct Only
      "text"                 gchararray            : Read / Write

## Signals

    "apply-tag" void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextTag    *arg1,
                                                GtkTextIter   *arg2,
                                                GtkTextIter   *arg3,
                                                gpointer       user_data)       : Run last
    "begin-user-action"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last
    "changed"   void        user_function      (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last
    "delete-range"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GtkTextIter   *arg2,
                                                gpointer       user_data)       : Run last
    "end-user-action"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last
    "insert-child-anchor"
                void        user_function      (GtkTextBuffer      *textbuffer,
                                                GtkTextIter        *arg1,
                                                GtkTextChildAnchor *arg2,
                                                gpointer            user_data)       : Run last
    "insert-pixbuf"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GdkPixbuf     *arg2,
                                                gpointer       user_data)       : Run last
    "insert-text"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                gchar         *arg2,
                                                gint           arg3,
                                                gpointer       user_data)       : Run last
    "mark-deleted"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextMark   *arg1,
                                                gpointer       user_data)       : Run last
    "mark-set"  void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GtkTextMark   *arg2,
                                                gpointer       user_data)       : Run last
    "modified-changed"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last
    "remove-tag"
                void        user_function      (GtkTextBuffer *textbuffer,
                                                GtkTextTag    *arg1,
                                                GtkTextIter   *arg2,
                                                GtkTextIter   *arg3,
                                                gpointer       user_data)       : Run last

## Description

You may wish to begin by reading the text widget conceptual overview which gives an overview of all the objects and data types related to the text widget and how they work together.

## Details

### GtkTextBuffer

    typedef struct _GtkTextBuffer GtkTextBuffer;

### gtk_text_buffer_new ()

    GtkTextBuffer* gtk_text_buffer_new          (GtkTextTagTable *table);

Creates a new text buffer.

`table` : | a tag table, or NULL to create a new one
Returns : | a new text buffer

### gtk_text_buffer_get_line_count ()

    gint        gtk_text_buffer_get_line_count  (GtkTextBuffer *buffer);

Obtains the number of lines in the buffer. This value is cached, so the function is very fast.

`buffer` : | a GtkTextBuffer
Returns : | number of lines in the buffer

### gtk_text_buffer_get_char_count ()

    gint        gtk_text_buffer_get_char_count  (GtkTextBuffer *buffer);

Gets the number of characters in the buffer; note that characters and bytes are not the same, you can't e.g. expect the contents of the buffer in string form to be this many bytes long. The character count is cached, so this function is very fast.

`buffer` : | a GtkTextBuffer
Returns : | number of characters in the buffer

### gtk_text_buffer_get_tag_table ()

    GtkTextTagTable* gtk_text_buffer_get_tag_table
                                                (GtkTextBuffer *buffer);

Get the GtkTextTagTable associated with this buffer.

`buffer` : | a GtkTextBuffer
Returns : | the buffer's tag table

### gtk_text_buffer_insert ()

    void        gtk_text_buffer_insert          (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len);

Inserts `len` bytes of `text` at position `iter`. If `len` is -1, `text` must be nul-terminated and will be inserted in its entirety. Emits the "insert_text" signal; insertion actually occurs in the default handler for the signal. `iter` is invalidated when insertion occurs (because the buffer contents change), but the default signal handler revalidates it to point to the end of the inserted text.

`buffer` : | a GtkTextBuffer
`iter` : | a position in the buffer
`text` : | UTF-8 format text to insert
`len` : | length of text in bytes, or -1

### gtk_text_buffer_insert_at_cursor ()

    void        gtk_text_buffer_insert_at_cursor
                                                (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len);

Simply calls `gtk_text_buffer_insert()`, using the current cursor position as the insertion point.

`buffer` : | a GtkTextBuffer
`text` : | some text in UTF-8 format
`len` : | length of text, in bytes

### gtk_text_buffer_insert_interactive ()

    gboolean    gtk_text_buffer_insert_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 gboolean default_editable);

Like `gtk_text_buffer_insert()`, but the insertion will not occur if `iter` is at a non-editable location in the buffer. Usually you want to prevent insertions at ineditable locations if the insertion results from a user action (is interactive).

`default_editable` indicates the editability of text that doesn't have a tag affecting editability applied to it. Typically the result of `gtk_text_view_get_editable()` is appropriate here.

`buffer` : | a GtkTextBuffer
`iter` : | a position in `buffer`
`text` : | some UTF-8 text
`len` : | length of text in bytes, or -1
`default_editable` : | default editability of buffer
Returns : | whether text was actually inserted

### gtk_text_buffer_insert_interactive_at_cursor ()

    gboolean    gtk_text_buffer_insert_interactive_at_cursor
                                                (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len,
                                                 gboolean default_editable);

Calls `gtk_text_buffer_insert_interactive()` at the cursor position.

`default_editable` indicates the editability of text that doesn't have a tag affecting editability applied to it. Typically the result of `gtk_text_view_get_editable()` is appropriate here.

`buffer` : | a GtkTextBuffer
`text` : | text in UTF-8 format
`len` : | length of text in bytes, or -1
`default_editable` : | default editability of buffer
Returns : | whether text was actually inserted

### gtk_text_buffer_insert_range ()

    void        gtk_text_buffer_insert_range    (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Copies text, tags, and pixbufs between `start` and `end` (the order of `start` and `end` doesn't matter) and inserts the copy at `iter`. Used instead of simply getting/inserting text because it preserves images and tags. If `start` and `end` are in a different buffer from `buffer`, the two buffers must share the same tag table.

Implemented via emissions of the insert_text and apply_tag signals, so expect those.

`buffer` : | a GtkTextBuffer
`iter` : | a position in `buffer`
`start` : | a position in a GtkTextBuffer
`end` : | another position in the same buffer as `start`

### gtk_text_buffer_insert_range_interactive ()

    gboolean    gtk_text_buffer_insert_range_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean default_editable);

Same as `gtk_text_buffer_insert_range()`, but does nothing if the insertion point isn't editable. The `default_editable` parameter indicates whether the text is editable at `iter` if no tags enclosing `iter` affect editability. Typically the result of `gtk_text_view_get_editable()` is appropriate here.

`buffer` : | a GtkTextBuffer
`iter` : | a position in `buffer`
`start` : | a position in a GtkTextBuffer
`end` : | another position in the same buffer as `start`
`default_editable` : | default editability of the buffer
Returns : | whether an insertion was possible at `iter`

### gtk_text_buffer_insert_with_tags ()

    void        gtk_text_buffer_insert_with_tags
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 GtkTextTag *first_tag,
                                                 ...);

Inserts `text` into `buffer` at `iter`, applying the list of tags to the newly-inserted text. The last tag specified must be NULL to terminate the list. Equivalent to calling `gtk_text_buffer_insert()`, then `gtk_text_buffer_apply_tag()` on the inserted text; `gtk_text_buffer_insert_with_tags()` is just a convenience function.

`buffer` : | a GtkTextBuffer
`iter` : | an iterator in `buffer`
`text` : | UTF-8 text
`len` : | length of `text`, or -1
`first_tag` : | first tag to apply to `text`
`...` : | NULL-terminated list of tags to apply

### gtk_text_buffer_insert_with_tags_by_name ()

    void        gtk_text_buffer_insert_with_tags_by_name
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 const gchar *text,
                                                 gint len,
                                                 const gchar *first_tag_name,
                                                 ...);

Same as `gtk_text_buffer_insert_with_tags()`, but allows you to pass in tag names instead of tag objects.

`buffer` : | a GtkTextBuffer
`iter` : | position in `buffer`
`text` : | UTF-8 text
`len` : | length of `text`, or -1
`first_tag_name` : | name of a tag to apply to `text`
`...` : | more tag names

### gtk_text_buffer_delete ()

    void        gtk_text_buffer_delete          (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);

Deletes text between `start` and `end`. The order of `start` and `end` is not actually relevant; `gtk_text_buffer_delete()` will reorder them. This function actually emits the "delete_range" signal, and the default handler of that signal deletes the text. Because the buffer is modified, all outstanding iterators become invalid after calling this function; however, the `start` and `end` will be re-initialized to point to the location where text was deleted.

`buffer` : | a GtkTextBuffer
`start` : | a position in `buffer`
`end` : | another position in `buffer`

### gtk_text_buffer_delete_interactive ()

    gboolean    gtk_text_buffer_delete_interactive
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *start_iter,
                                                 GtkTextIter *end_iter,
                                                 gboolean default_editable);

Deletes all editable text in the given range. Calls `gtk_text_buffer_delete()` for each editable sub-range of [`start`,`end`). `start` and `end` are revalidated to point to the location of the last deleted range, or left untouched if no text was deleted.

`buffer` : | a GtkTextBuffer
`start_iter` : | start of range to delete
`end_iter` : | end of range
`default_editable` : | whether the buffer is editable by default
Returns : | whether some text was actually deleted

### gtk_text_buffer_backspace ()

    gboolean    gtk_text_buffer_backspace       (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gboolean interactive,
                                                 gboolean default_editable);

Performs the appropriate action as if the user hit the delete key with the cursor at the position specified by `iter`. In the normal case a single character will be deleted, but when combining accents are involved, more than one character can be deleted, and when precomposed character and accent combinations are involved, less than one character will be deleted.

Because the buffer is modified, all outstanding iterators become invalid after calling this function; however, the `iter` will be re-initialized to point to the location where text was deleted.

`buffer` : | a GtkTextBuffer
`iter` : | a position in `buffer`
`interactive` : | whether the deletion is caused by user interaction
`default_editable` : | whether the buffer is editable by default
Returns : | `TRUE` if the buffer was modified

Since 2.6

### gtk_text_buffer_set_text ()

    void        gtk_text_buffer_set_text        (GtkTextBuffer *buffer,
                                                 const gchar *text,
                                                 gint len);

Deletes current contents of `buffer`, and inserts `text` instead. If `len` is -1, `text` must be nul-terminated. `text` must be valid UTF-8.

`buffer` : | a GtkTextBuffer
`text` : | UTF-8 text to insert
`len` : | length of `text` in bytes

### gtk_text_buffer_get_text ()

    gchar*      gtk_text_buffer_get_text        (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean include_hidden_chars);

Returns the text in the range [`start`,`end`). Excludes undisplayed text (text marked with tags that set the invisibility attribute) if `include_hidden_chars` is `FALSE`. Does not include characters representing embedded images, so byte and character indexes into the returned string do not correspond to byte and character indexes into the buffer. Contrast with `gtk_text_buffer_get_slice()`.

`buffer` : | a GtkTextBuffer
`start` : | start of a range
`end` : | end of a range
`include_hidden_chars` : | whether to include invisible text
Returns : | an allocated UTF-8 string

### gtk_text_buffer_get_slice ()

    gchar*      gtk_text_buffer_get_slice       (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end,
                                                 gboolean include_hidden_chars);

Returns the text in the range [`start`,`end`). Excludes undisplayed text (text marked with tags that set the invisibility attribute) if `include_hidden_chars` is `FALSE`. The returned string includes a 0xFFFC character whenever the buffer contains embedded images, so byte and character indexes into the returned string do correspond to byte and character indexes into the buffer. Contrast with `gtk_text_buffer_get_text()`. 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.

`buffer` : | a GtkTextBuffer
`start` : | start of a range
`end` : | end of a range
`include_hidden_chars` : | whether to include invisible text
Returns : | an allocated UTF-8 string

### gtk_text_buffer_insert_pixbuf ()

    void        gtk_text_buffer_insert_pixbuf   (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GdkPixbuf *pixbuf);

Inserts an image into the text buffer at `iter`. The image will be counted as one character in character counts, and when obtaining the buffer contents as a string, will be represented by the Unicode "object replacement character" 0xFFFC. Note that the "slice" variants for obtaining portions of the buffer as a string include this character for pixbufs, but the "text" variants do not. e.g. see `gtk_text_buffer_get_slice()` and `gtk_text_buffer_get_text()`.

`buffer` : | a GtkTextBuffer
`iter` : | location to insert the pixbuf
`pixbuf` : | a GdkPixbuf

### gtk_text_buffer_insert_child_anchor ()

    void        gtk_text_buffer_insert_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextChildAnchor *anchor);

Inserts a child widget anchor into the text buffer at `iter`. The anchor will be counted as one character in character counts, and when obtaining the buffer contents as a string, will be represented by the Unicode "object replacement character" 0xFFFC. Note that the "slice" variants for obtaining portions of the buffer as a string include this character for child anchors, but the "text" variants do not. e.g. see `gtk_text_buffer_get_slice()` and `gtk_text_buffer_get_text()`. Consider `gtk_text_buffer_create_child_anchor()` as a more convenient alternative to this function. The buffer will add a reference to the anchor, so you can unref it after insertion.

`buffer` : | a GtkTextBuffer
`iter` : | location to insert the anchor
`anchor` : | a GtkTextChildAnchor

### gtk_text_buffer_create_child_anchor ()

    GtkTextChildAnchor* gtk_text_buffer_create_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);

This is a convenience function which simply creates a child anchor with `gtk_text_child_anchor_new()` and inserts it into the buffer with `gtk_text_buffer_insert_child_anchor()`. The new anchor is owned by the buffer; no reference count is returned to the caller of `gtk_text_buffer_create_child_anchor()`.

`buffer` : | a GtkTextBuffer
`iter` : | location in the buffer
Returns : | the created child anchor

### gtk_text_buffer_create_mark ()

    GtkTextMark* gtk_text_buffer_create_mark    (GtkTextBuffer *buffer,
                                                 const gchar *mark_name,
                                                 const GtkTextIter *where,
                                                 gboolean left_gravity);

Creates a mark at position `where`. If `mark_name` is `NULL`, the mark is anonymous; otherwise, the mark can be retrieved by name using `gtk_text_buffer_get_mark()`. If a mark has left gravity, and text is inserted at the mark's current location, the mark will be moved to the left of the newly-inserted text. If the mark has right gravity (`left_gravity` = `FALSE`), the mark will end up on the right of newly-inserted text. The standard left-to-right cursor is a mark with right gravity (when you type, the cursor stays on the right side of the text you're typing).

The caller of this function does not own a reference to the returned GtkTextMark, so you can ignore the return value if you like. Marks are owned by the buffer and go away when the buffer does.

Emits the "mark_set" signal as notification of the mark's initial placement.

`buffer` : | a GtkTextBuffer
`mark_name` : | name for mark, or `NULL`
`where` : | location to place mark
`left_gravity` : | whether the mark has left gravity
Returns : | the new GtkTextMark object

### gtk_text_buffer_move_mark ()

    void        gtk_text_buffer_move_mark       (GtkTextBuffer *buffer,
                                                 GtkTextMark *mark,
                                                 const GtkTextIter *where);

Moves `mark` to the new location `where`. Emits the "mark_set" signal as notification of the move.

`buffer` : | a GtkTextBuffer
`mark` : | a GtkTextMark
`where` : | new location for `mark` in `buffer`

### gtk_text_buffer_move_mark_by_name ()

    void        gtk_text_buffer_move_mark_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *where);

Moves the mark named `name` (which must exist) to location `where`. See `gtk_text_buffer_move_mark()` for details.

`buffer` : | a GtkTextBuffer
`name` : | name of a mark
`where` : | new location for mark

### gtk_text_buffer_delete_mark ()

    void        gtk_text_buffer_delete_mark     (GtkTextBuffer *buffer,
                                                 GtkTextMark *mark);

Deletes `mark`, so that it's no longer located anywhere in the buffer. Removes the reference the buffer holds to the mark, so if you haven't called `g_object_ref()` on the mark, it will be freed. Even if the mark isn't freed, most operations on `mark` become invalid. There is no way to undelete a mark. `gtk_text_mark_get_deleted()` will return TRUE after this function has been called on a mark; `gtk_text_mark_get_deleted()` indicates that a mark no longer belongs to a buffer. The "mark_deleted" signal will be emitted as notification after the mark is deleted.

`buffer` : | a GtkTextBuffer
`mark` : | a GtkTextMark in `buffer`

### gtk_text_buffer_delete_mark_by_name ()

    void        gtk_text_buffer_delete_mark_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name);

Deletes the mark named `name`; the mark must exist. See `gtk_text_buffer_delete_mark()` for details.

`buffer` : | a GtkTextBuffer
`name` : | name of a mark in `buffer`

### gtk_text_buffer_get_mark ()

    GtkTextMark* gtk_text_buffer_get_mark       (GtkTextBuffer *buffer,
                                                 const gchar *name);

Returns the mark named `name` in buffer `buffer`, or NULL if no such mark exists in the buffer.

`buffer` : | a GtkTextBuffer
`name` : | a mark name
Returns : | a GtkTextMark, or NULL

### gtk_text_buffer_get_insert ()

    GtkTextMark* gtk_text_buffer_get_insert     (GtkTextBuffer *buffer);

Returns the mark that represents the cursor (insertion point). Equivalent to calling `gtk_text_buffer_get_mark()` to get the mark named "insert", but very slightly more efficient, and involves less typing.

`buffer` : | a GtkTextBuffer
Returns : | insertion point mark

### gtk_text_buffer_get_selection_bound ()

    GtkTextMark* gtk_text_buffer_get_selection_bound
                                                (GtkTextBuffer *buffer);

Returns the mark that represents the selection bound. Equivalent to calling `gtk_text_buffer_get_mark()` to get the mark named "selection_bound", but very slightly more efficient, and involves less typing.

The currently-selected text in `buffer` is the region between the "selection_bound" and "insert" marks. If "selection_bound" and "insert" are in the same place, then there is no current selection. `gtk_text_buffer_get_selection_bounds()` is another convenient function for handling the selection, if you just want to know whether there's a selection and what its bounds are.

`buffer` : | a GtkTextBuffer
Returns : | selection bound mark

### gtk_text_buffer_place_cursor ()

    void        gtk_text_buffer_place_cursor    (GtkTextBuffer *buffer,
                                                 const GtkTextIter *where);

This function moves the "insert" and "selection_bound" marks simultaneously. If you move them to the same place in two steps with `gtk_text_buffer_move_mark()`, you will temporarily select a region in between their old and new locations, which can be pretty inefficient since the temporarily-selected region will force stuff to be recalculated. This function moves them as a unit, which can be optimized.

`buffer` : | a GtkTextBuffer
`where` : | where to put the cursor

### gtk_text_buffer_select_range ()

    void        gtk_text_buffer_select_range    (GtkTextBuffer *buffer,
                                                 const GtkTextIter *ins,
                                                 const GtkTextIter *bound);

This function moves the "insert" and "selection_bound" marks simultaneously. If you move them in two steps with `gtk_text_buffer_move_mark()`, you will temporarily select a region in between their old and new locations, which can be pretty inefficient since the temporarily-selected region will force stuff to be recalculated. This function moves them as a unit, which can be optimized.

`buffer` : | a GtkTextBuffer
`ins` : | where to put the "insert" mark
`bound` : | where to put the "selection_bound" mark

Since 2.4

### gtk_text_buffer_apply_tag ()

    void        gtk_text_buffer_apply_tag       (GtkTextBuffer *buffer,
                                                 GtkTextTag *tag,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Emits the "apply_tag" signal on `buffer`. The default handler for the signal applies `tag` to the given range. `start` and `end` do not have to be in order.

`buffer` : | a GtkTextBuffer
`tag` : | a GtkTextTag
`start` : | one bound of range to be tagged
`end` : | other bound of range to be tagged

### gtk_text_buffer_remove_tag ()

    void        gtk_text_buffer_remove_tag      (GtkTextBuffer *buffer,
                                                 GtkTextTag *tag,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Emits the "remove_tag" signal. The default handler for the signal removes all occurrences of `tag` from the given range. `start` and `end` don't have to be in order.

`buffer` : | a GtkTextBuffer
`tag` : | a GtkTextTag
`start` : | one bound of range to be untagged
`end` : | other bound of range to be untagged

### gtk_text_buffer_apply_tag_by_name ()

    void        gtk_text_buffer_apply_tag_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Calls `gtk_text_tag_table_lookup()` on the buffer's tag table to get a GtkTextTag, then calls `gtk_text_buffer_apply_tag()`.

`buffer` : | a GtkTextBuffer
`name` : | name of a named GtkTextTag
`start` : | one bound of range to be tagged
`end` : | other bound of range to be tagged

### gtk_text_buffer_remove_tag_by_name ()

    void        gtk_text_buffer_remove_tag_by_name
                                                (GtkTextBuffer *buffer,
                                                 const gchar *name,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Calls `gtk_text_tag_table_lookup()` on the buffer's tag table to get a GtkTextTag, then calls `gtk_text_buffer_remove_tag()`.

`buffer` : | a GtkTextBuffer
`name` : | name of a GtkTextTag
`start` : | one bound of range to be untagged
`end` : | other bound of range to be untagged

### gtk_text_buffer_remove_all_tags ()

    void        gtk_text_buffer_remove_all_tags (GtkTextBuffer *buffer,
                                                 const GtkTextIter *start,
                                                 const GtkTextIter *end);

Removes all tags in the range between `start` and `end`. Be careful with this function; it could remove tags added in code unrelated to the code you're currently writing. That is, using this function is probably a bad idea if you have two or more unrelated code sections that add tags.

`buffer` : | a GtkTextBuffer
`start` : | one bound of range to be untagged
`end` : | other bound of range to be untagged

### gtk_text_buffer_create_tag ()

    GtkTextTag* gtk_text_buffer_create_tag      (GtkTextBuffer *buffer,
                                                 const gchar *tag_name,
                                                 const gchar *first_property_name,
                                                 ...);

Creates a tag and adds it to the tag table for `buffer`. Equivalent to calling `gtk_text_tag_new()` and then adding the tag to the buffer's tag table. The returned tag is owned by the buffer's tag table, so the ref count will be equal to one.

If `tag_name` is `NULL`, the tag is anonymous.

If `tag_name` is non-`NULL`, a tag called `tag_name` must not already exist in the tag table for this buffer.

The `first_property_name` argument and subsequent arguments are a list of properties to set on the tag, as with `g_object_set()`.

`buffer` : | a GtkTextBuffer
`tag_name` : | name of the new tag, or `NULL`
`first_property_name` : | name of first property to set, or `NULL`
`...` : | `NULL`-terminated list of property names and values
Returns : | a new tag

### gtk_text_buffer_get_iter_at_line_offset ()

    void        gtk_text_buffer_get_iter_at_line_offset
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number,
                                                 gint char_offset);

Obtains an iterator pointing to `char_offset` within the given line. The `char_offset` must exist, offsets off the end of the line are not allowed. Note characters, not bytes; UTF-8 may encode one character as multiple bytes.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize
`line_number` : | line number counting from 0
`char_offset` : | char offset from start of line

### gtk_text_buffer_get_iter_at_offset ()

    void        gtk_text_buffer_get_iter_at_offset
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint char_offset);

Initializes `iter` to a position `char_offset` chars from the start of the entire buffer. If `char_offset` is -1 or greater than the number of characters in the buffer, `iter` is initialized to the end iterator, the iterator one past the last valid character in the buffer.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize
`char_offset` : | char offset from start of buffer, counting from 0, or -1

### gtk_text_buffer_get_iter_at_line ()

    void        gtk_text_buffer_get_iter_at_line
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number);

Initializes `iter` to the start of the given line.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize
`line_number` : | line number counting from 0

### gtk_text_buffer_get_iter_at_line_index ()

    void        gtk_text_buffer_get_iter_at_line_index
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 gint line_number,
                                                 gint byte_index);

Obtains an iterator pointing to `byte_index` within the given line. `byte_index` must be the start of a UTF-8 character, and must not be beyond the end of the line. Note bytes, not characters; UTF-8 may encode one character as multiple bytes.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize
`line_number` : | line number counting from 0
`byte_index` : | byte index from start of line

### gtk_text_buffer_get_iter_at_mark ()

    void        gtk_text_buffer_get_iter_at_mark
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextMark *mark);

Initializes `iter` with the current position of `mark`.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize
`mark` : | a GtkTextMark in `buffer`

### gtk_text_buffer_get_iter_at_child_anchor ()

    void        gtk_text_buffer_get_iter_at_child_anchor
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter,
                                                 GtkTextChildAnchor *anchor);

Obtains the location of `anchor` within `buffer`.

`buffer` : | a GtkTextBuffer
`iter` : | an iterator to be initialized
`anchor` : | a child anchor that appears in `buffer`

### gtk_text_buffer_get_start_iter ()

    void        gtk_text_buffer_get_start_iter  (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);

Initialized `iter` with the first position in the text buffer. This is the same as using `gtk_text_buffer_get_iter_at_offset()` to get the iter at character offset 0.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize

### gtk_text_buffer_get_end_iter ()

    void        gtk_text_buffer_get_end_iter    (GtkTextBuffer *buffer,
                                                 GtkTextIter *iter);

Initializes `iter` with the "end iterator," one past the last valid character in the text buffer. If dereferenced with `gtk_text_iter_get_char()`, the end iterator has a character value of 0. The entire buffer lies in the range from the first position in the buffer (call `gtk_text_buffer_get_start_iter()` to get character position 0) to the end iterator.

`buffer` : | a GtkTextBuffer
`iter` : | iterator to initialize

### gtk_text_buffer_get_bounds ()

    void        gtk_text_buffer_get_bounds      (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);

Retrieves the first and last iterators in the buffer, i.e. the entire buffer lies within the range [`start`,`end`).

`buffer` : | a GtkTextBuffer
`start` : | iterator to initialize with first position in the buffer
`end` : | iterator to initialize with the end iterator

### gtk_text_buffer_get_modified ()

    gboolean    gtk_text_buffer_get_modified    (GtkTextBuffer *buffer);

Indicates whether the buffer has been modified since the last call to `gtk_text_buffer_set_modified()` set the modification flag to `FALSE`. Used for example to enable a "save" function in a text editor.

`buffer` : | a GtkTextBuffer
Returns : | `TRUE` if the buffer has been modified

### gtk_text_buffer_set_modified ()

    void        gtk_text_buffer_set_modified    (GtkTextBuffer *buffer,
                                                 gboolean setting);

Used to keep track of whether the buffer has been modified since the last time it was saved. Whenever the buffer is saved to disk, call gtk_text_buffer_set_modified (`buffer`, FALSE). When the buffer is modified, it will automatically toggled on the modified bit again. When the modified bit flips, the buffer emits a "modified_changed" signal.

`buffer` : | a GtkTextBuffer
`setting` : | modification flag setting

### gtk_text_buffer_delete_selection ()

    gboolean    gtk_text_buffer_delete_selection
                                                (GtkTextBuffer *buffer,
                                                 gboolean interactive,
                                                 gboolean default_editable);

Deletes the range between the "insert" and "selection_bound" marks, that is, the currently-selected text. If `interactive` is `TRUE`, the editability of the selection will be considered (users can't delete uneditable text).

`buffer` : | a GtkTextBuffer
`interactive` : | whether the deletion is caused by user interaction
`default_editable` : | whether the buffer is editable by default
Returns : | whether there was a non-empty selection to delete

### gtk_text_buffer_paste_clipboard ()

    void        gtk_text_buffer_paste_clipboard (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard,
                                                 GtkTextIter *override_location,
                                                 gboolean default_editable);

Pastes the contents of a clipboard at the insertion point, or at `override_location`. (Note: pasting is asynchronous, that is, we'll ask for the paste data and return, and at some point later after the main loop runs, the paste data will be inserted.)

`buffer` : | a GtkTextBuffer
`clipboard` : | the GtkClipboard to paste from
`override_location` : | location to insert pasted text, or `NULL` for at the cursor
`default_editable` : | whether the buffer is editable by default

### gtk_text_buffer_copy_clipboard ()

    void        gtk_text_buffer_copy_clipboard  (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);

Copies the currently-selected text to a clipboard.

`buffer` : | a GtkTextBuffer
`clipboard` : | the GtkClipboard object to copy to.

### gtk_text_buffer_cut_clipboard ()

    void        gtk_text_buffer_cut_clipboard   (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard,
                                                 gboolean default_editable);

Copies the currently-selected text to a clipboard, then deletes said text if it's editable.

`buffer` : | a GtkTextBuffer
`clipboard` : | the GtkClipboard object to cut to.
`default_editable` : | default editability of the buffer

### gtk_text_buffer_get_selection_bounds ()

    gboolean    gtk_text_buffer_get_selection_bounds
                                                (GtkTextBuffer *buffer,
                                                 GtkTextIter *start,
                                                 GtkTextIter *end);

Returns `TRUE` if some text is selected; places the bounds of the selection in `start` and `end` (if the selection has length 0, then `start` and `end` are filled in with the same value). `start` and `end` will be in ascending order. If `start` and `end` are NULL, then they are not filled in, but the return value still indicates whether text is selected.

`buffer` : | a GtkTextBuffer a GtkTextBuffer
`start` : | iterator to initialize with selection start
`end` : | iterator to initialize with selection end
Returns : | whether the selection has nonzero length

### gtk_text_buffer_begin_user_action ()

    void        gtk_text_buffer_begin_user_action
                                                (GtkTextBuffer *buffer);

Called to indicate that the buffer operations between here and a call to `gtk_text_buffer_end_user_action()` are part of a single user-visible operation. The operations between `gtk_text_buffer_begin_user_action()` and `gtk_text_buffer_end_user_action()` can then be grouped when creating an undo stack. GtkTextBuffer maintains a count of calls to `gtk_text_buffer_begin_user_action()` that have not been closed with a call to `gtk_text_buffer_end_user_action()`, and emits the "begin_user_action" and "end_user_action" signals only for the outermost pair of calls. This allows you to build user actions from other user actions.

The "interactive" buffer mutation functions, such as `gtk_text_buffer_insert_interactive()`, automatically call begin/end user action around the buffer operations they perform, so there's no need to add extra calls if you user action consists solely of a single call to one of those functions.

`buffer` : | a GtkTextBuffer

### gtk_text_buffer_end_user_action ()

    void        gtk_text_buffer_end_user_action (GtkTextBuffer *buffer);

Should be paired with a call to `gtk_text_buffer_begin_user_action()`. See that function for a full explanation.

`buffer` : | a GtkTextBuffer

### gtk_text_buffer_add_selection_clipboard ()

    void        gtk_text_buffer_add_selection_clipboard
                                                (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);

Adds `clipboard` to the list of clipboards in which the selection contents of `buffer` are available. In most cases, `clipboard` will be the GtkClipboard of type `GDK_SELECTION_PRIMARY` for a view of `buffer`.

`buffer` : | a GtkTextBuffer
`clipboard` : | a GtkClipboard

### gtk_text_buffer_remove_selection_clipboard ()

    void        gtk_text_buffer_remove_selection_clipboard
                                                (GtkTextBuffer *buffer,
                                                 GtkClipboard *clipboard);

Removes a GtkClipboard added with `gtk_text_buffer_add_selection_clipboard()`

`buffer` : | a GtkTextBuffer
`clipboard` : | a GtkClipboard added to `buffer` by `gtk_text_buffer_add_selection_clipboard()`.

## Property Details

### The "`tag-table`" property

      "tag-table"            GtkTextTagTable       : Read / Write / Construct Only

Text Tag Table.

### The "`text`" property

      "text"                 gchararray            : Read / Write

The text content of the buffer. Without child widgets and images, see `gtk_text_buffer_get_text()` for more information.

Default value: ""

Since 2.8

## Signal Details

### The "apply-tag" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextTag    *arg1,
                                                GtkTextIter   *arg2,
                                                GtkTextIter   *arg3,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`arg3` : |
`user_data` : | user data set when the signal handler was connected.

### The "begin-user-action" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "changed" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "delete-range" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GtkTextIter   *arg2,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`user_data` : | user data set when the signal handler was connected.

### The "end-user-action" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "insert-child-anchor" signal

    void        user_function                  (GtkTextBuffer      *textbuffer,
                                                GtkTextIter        *arg1,
                                                GtkTextChildAnchor *arg2,
                                                gpointer            user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`user_data` : | user data set when the signal handler was connected.

### The "insert-pixbuf" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GdkPixbuf     *arg2,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`user_data` : | user data set when the signal handler was connected.

### The "insert-text" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                gchar         *arg2,
                                                gint           arg3,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`arg3` : |
`user_data` : | user data set when the signal handler was connected.

### The "mark-deleted" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextMark   *arg1,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`user_data` : | user data set when the signal handler was connected.

### The "mark-set" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextIter   *arg1,
                                                GtkTextMark   *arg2,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`user_data` : | user data set when the signal handler was connected.

### The "modified-changed" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`user_data` : | user data set when the signal handler was connected.

### The "remove-tag" signal

    void        user_function                  (GtkTextBuffer *textbuffer,
                                                GtkTextTag    *arg1,
                                                GtkTextIter   *arg2,
                                                GtkTextIter   *arg3,
                                                gpointer       user_data)       : Run last

`textbuffer` : | the object which received the signal.
`arg1` : |
`arg2` : |
`arg3` : |
`user_data` : | user data set when the signal handler was connected.

## See Also

GtkTextView, GtkTextIter, GtkTextMark