GtkAda Reference Manual - Package Gtk.Text_Buffer

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# Package Gtk.Text`_`Buffer

This is the public representation of a text buffer to be used in cunjunction with Gtk.Text_View.

- Gtk.Text_Buffer Widget Hierarchy
- Gtk.Text_Buffer Signals
- Gtk.Text_Buffer Subprograms

## Widget Hierarchy

    GObject                       (see section Package Glib.Object)
    Gtk_Object                    (see section Package Gtk.Object)
       \___ Gtk_Text_Buffer       (see section Package Gtk.Text_Buffer)

## Signals

- "apply_tag" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Tag : access Gtk.Text_Tag.Gtk_Text_Tag_Record'Class;
  Start_Char : Gtk.Text_Iter.Gtk_Text_Iter;
  End_Char : Gtk.Text_Iter.Gtk_Text_Iter);
- "begin_user_action" procedure Handler (Widget : access Gtk_Text_Buffer_Record'Class);
- "changed" procedure Handler (Widget : access Gtk_Text_Buffer_Record'Class);
- "delete_range" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Start : Gtk.Text_Iter.Gtk_Text_Iter;
  The_End : Gtk.Text_Iter.Gtk_Text_Iter);
- "end_user_action" procedure Handler (Widget : access Gtk_Text_Buffer_Record'Class);
- "insert_child_anchor" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Pos : Gtk.Text_Iter.Gtk_Text_Iter;
  Anchor : access Gtk.Text_Child.Gtk_Text_Child_Anchor_Record'Class);
- "insert_pixbuf" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Pos : Gtk.Text_Iter.Gtk_Text_Iter;
  Pixbuf : Gdk.Pixbuf.Gdk_Pixbuf);
- "insert_text" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Pos : Gtk.Text_Iter.Gtk_Text_Iter;
  Text : UTF8_String;
  Length : Gint);
- "mark_deleted" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Mark : access Gtk.Text_Mark.Gtk_Text_Mark_Record'Class);
- "mark_set" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Location : Gtk.Text_Iter.Gtk_Text_Iter;
  Mark : access Gtk.Text_Mark.Gtk_Text_Mark_Record'Class);
- "modified_changed" procedure Handler (Widget : access Gtk_Text_Buffer_Record'Class);
- "remove_tag" procedure Handler
  (Widget : access Gtk_Text_Buffer_Record'Class;
  Tag : access Gtk.Text_Tag.Gtk_Text_Tag_Record'Class;
  Start_Char : Gtk.Text_Iter.Gtk_Text_Iter;
  End_Char : Gtk.Text_Iter.Gtk_Text_Iter);

## Subprograms

    procedure Gtk_New
      (Buffer             : out    Gtk_Text_Buffer;
       Table              :        Gtk.Text_Tag_Table.Gtk_Text_Tag_Table
                           := null);
| Create a new text buffer. Create a new table if Table is null. The buffer is created with a reference count of 1, and therefore should be manually unreferenced (Glib.Object.Unref). It is recommended to do that as soon as the buffer has been used to create a Gtk.Text_View.Gtk_Text_View widget.
    function Get_Type              return Glib.GType;
| Return the internal value associated with a Gtk_Text_Buffer.
    function Get_Line_Count
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Gint;
| Return the number of lines in the buffer. This value is cached, so the function is very fast.
    function Get_Char_Count
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Gint;
| Return 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.
    function Get_Tag_Table
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Gtk.Text_Tag_Table.Gtk_Text_Tag_Table;
| Get the Gtk_Text_Tag_Table associated with this buffer.
    procedure Set_Text
      (Buffer             : access Gtk_Text_Buffer_Record;
       Text               :        UTF8_String);
| Delete current contents of Buffer, and insert Text instead. If Text doesn't end with a newline, a newline is added; Gtk_Text_Buffer contents must always end with a newline. If Text ends with a newline, the new buffer contents will be exactly Text. Text: UTF-8 format text to insert.
    procedure Insert
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Text               :        UTF8_String);
| Insert Text at position Iter. Emit 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. Text: UTF-8 format text to insert.
    procedure Insert_At_Cursor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Text               :        UTF8_String);
| Call Buffer_Insert, using the current cursor position as the insertion point. Text: UTF-8 format text to insert.
    procedure Insert_At_Cursor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Text               :        Gtkada.Types.Chars_Ptr;
       Len                :        Gint := -1);
| Call Buffer_Insert, using the current cursor position as the insertion point. Text: UTF-8 format C string to insert.
    procedure Insert_Interactive
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Text               :        UTF8_String;
       Default_Editable   :        Boolean;
       Result             : out    Boolean);
| Like 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. Text: UTF-8 format text to insert. Result: whether text was actually inserted.
    function Insert_Interactive_At_Cursor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Text               :        UTF8_String;
       Default_Editable   :        Boolean)
       return Boolean;
| Call Insert_Interactive at the cursor position. Text: UTF-8 format text to insert. Return value: whether text was actually inserted.
    procedure Insert_Range
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Copy text, tags, and pixbufs between Start and End. The order of Start and End doesn't matter. Also insert 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.
    procedure Insert_Range_Interactive
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter;
       Default_Editable   :        Boolean;
       Result             : out    Boolean);
| Like Insert_Range, 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. Result: whether an insertion was possible at Iter
    procedure Delete
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              : in out Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            : in out Gtk.Text_Iter.Gtk_Text_Iter);
| Delete text between Start and End. The order of Start and End is not actually relevant; 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. Note that the final newline in the buffer may not be deleted; a Gtk_Text_Buffer always contains at least one newline. You can safely include the final newline in the range [Start,End) but it won't be affected by the deletion.
    procedure Delete_Interactive
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start_Iter         : in out Gtk.Text_Iter.Gtk_Text_Iter;
       End_Iter           : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Default_Editable   :        Boolean;
       Result             : out    Boolean);
| Delete all editable text in the given range. Call 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. Result: whether some text was actually deleted
    function Get_Text
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter;
       Include_Hidden_Chars  :        Boolean := False)
       return UTF8_String;
| Return the text in the range [Start,End). Exclude 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 Get_Slice. Return value: an allocated UTF-8 string
    function Get_Text
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter;
       Include_Hidden_Chars  :        Boolean := False)
       return Gtkada.Types.Chars_Ptr;
| Same as Get_Text above, but return a pointer to a C string, for efficiency. The caller is responsible for freeing (using Gtkada.Types.g_free) the returned pointer.
    function Get_Slice
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter;
       Include_Hidden_Chars  :        Boolean := False)
       return UTF8_String;
| Return the text in the range [Start,End). Exclude undisplayed text (text marked with tags that set the invisibility attribute) if Include_Hidden_Chars is False. The returned string includes a 16#FFFC# 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 Get_Text. Note that 16#FFFC# can occur in normal text as well, so it is not a reliable indicator that a pixbuf or widget is in the buffer. Return value: an allocated UTF-8 string
    function Get_Slice
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter;
       Include_Hidden_Chars  :        Boolean := False)
       return Gtkada.Types.Chars_Ptr;
| Same as Get_Slice above, but return a pointer to a C string, for efficiency. The caller is responsible for freeing (using Gtkada.Types.g_free) the returned pointer.
    procedure Insert_Pixbuf
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               :        Gtk.Text_Iter.Gtk_Text_Iter;
       Pixbuf             :        Gdk.Pixbuf.Gdk_Pixbuf);
| Insert 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" 16#FFFC#. 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 Get_Slice and Get_Text.
    procedure Insert_Child_Anchor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Anchor             : access Gtk.Text_Child.Gtk_Text_Child_Anchor_Record'Class);
| Insert 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" 16#FFFC#. 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 Get_Slice and Get_Text. Consider 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.
    procedure Create_Child_Anchor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : in out Gtk.Text_Iter.Gtk_Text_Iter;
       Result             : out    Gtk.Text_Child.Gtk_Text_Child_Anchor);
| Convenience function which simply creates a child anchor with Gtk.Text_Child.Gtk_New and inserts it into the buffer with Insert_Child_Anchor. Result: the created child anchor.
    function Create_Mark
      (Buffer             : access Gtk_Text_Buffer_Record;
       Mark_Name          :        String := "";
       Where              :        Gtk.Text_Iter.Gtk_Text_Iter;
       Left_Gravity       :        Boolean := True)
       return Gtk.Text_Mark.Gtk_Text_Mark;
| Create a mark at position Where. If Mark_Name is null, the mark is anonymous; otherwise, the mark can be retrieved by name using 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 Gtk_Text_Mark, so you can ignore the return value if you like. Marks are owned by the buffer and go away when the buffer does. Emit the "mark_set" signal as notification of the mark's initial placement. Return value: the new Gtk_Text_Mark object.
    procedure Move_Mark
      (Buffer             : access Gtk_Text_Buffer_Record;
       Mark               : access Gtk.Text_Mark.Gtk_Text_Mark_Record'Class;
       Where              :        Gtk.Text_Iter.Gtk_Text_Iter);
| Move Mark to the new location Where. Emit the "mark_set" signal as notification of the move.
    procedure Delete_Mark
      (Buffer             : access Gtk_Text_Buffer_Record;
       Mark               : access Gtk.Text_Mark.Gtk_Text_Mark_Record'Class);
| Delete Mark, so that it's no longer located anywhere in the buffer. Remove the reference the buffer holds to the mark, so if you haven't called 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.
    function Get_Mark
      (Buffer             : access Gtk_Text_Buffer_Record;
       Name               :        String)
       return Gtk.Text_Mark.Gtk_Text_Mark;
| Return the mark named Name in Buffer or null if no such mark exists in the buffer.
    procedure Move_Mark_By_Name
      (Buffer             : access Gtk_Text_Buffer_Record;
       Name               :        String;
       Where              :        Gtk.Text_Iter.Gtk_Text_Iter);
| Move the mark named Name (which must exist) to location Where. See Move_Mark for details.
    procedure Delete_Mark_By_Name
      (Buffer             : access Gtk_Text_Buffer_Record;
       Name               :        String);
| Delete the mark named Name The mark must exist. See Delete_Mark for details.
    function Get_Insert
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Gtk.Text_Mark.Gtk_Text_Mark;
| Return the mark that represents the cursor (insertion point). Equivalent to calling Get_Mark to get the mark name "insert", but slightly more efficient, and involves less typing.
    function Get_Selection_Bound
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Gtk.Text_Mark.Gtk_Text_Mark;
| Return the mark that represents the selection bound. Equivalent to calling Get_Mark to get the mark name "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. 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.
    procedure Place_Cursor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Where              :        Gtk.Text_Iter.Gtk_Text_Iter);
| Move the "insert" and "selection_bound" marks simultaneously. If you move them to the same place in two steps with 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 recomputed. This function moves them as a unit, which can be optimized. If you want to get the position of the cursor, the simplest way is Get_Iter_At_Mark (Buffer, Iter, Get_Insert (Buffer));
    procedure Apply_Tag
      (Buffer             : access Gtk_Text_Buffer_Record;
       Tag                : access Gtk.Text_Tag.Gtk_Text_Tag_Record'Class;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Emit 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.
    procedure Remove_Tag
      (Buffer             : access Gtk_Text_Buffer_Record;
       Tag                : access Gtk.Text_Tag.Gtk_Text_Tag_Record'Class;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Emit 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.
    procedure Remove_All_Tags
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Remove all tags in the range between Start and End. Note that this procedure should be used carefully, as it might be removing tags that were added from another section of the code.
    procedure Apply_Tag_By_Name
      (Buffer             : access Gtk_Text_Buffer_Record;
       Name               :        String;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Call Gtk.Text_Tag_Table.Lookup on the buffer's tag table to get a Gtk_Text_Tag, then call Apply_Tag.
    procedure Remove_Tag_By_Name
      (Buffer             : access Gtk_Text_Buffer_Record;
       Name               :        String;
       Start              :        Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            :        Gtk.Text_Iter.Gtk_Text_Iter);
| Call Gtk.Text_Tag_Table.Lookup on the buffer's tag table to get a Gtk_Text_Tag, then call Remove_Tag.
    procedure Get_Iter_At_Line_Offset
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Line_Number        :        Gint;
       Char_Offset        :        Gint := 0);
| Obtain 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.
    procedure Get_Iter_At_Line_Index
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Line_Number        :        Gint;
       Byte_Index         :        Gint := 0);
| Obtain 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.
    procedure Get_Iter_At_Offset
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Char_Offset        :        Gint);
| Initialize Iter to a position Char_Offset chars from the start of the entire buffer. Char_Offset: char offset from start of buffer, counting from 0.
    procedure Get_Iter_At_Line
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Line_Number        :        Gint);
| Initialize Iter to the start of the given line. Line_Number: line number counting from 0.
    procedure Get_Start_Iter
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter);
| Initialize Iter with the first position in the text buffer. This is the same as using Get_Iter_At_Offset with Offset set to 0.
    procedure Get_End_Iter
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter);
| Initialize 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 Get_Iter_At_Offset to get character position 0) to the end iterator.
    procedure Get_Bounds
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              : out    Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            : out    Gtk.Text_Iter.Gtk_Text_Iter);
| Retrieve the first and last iterators in the buffer. The entire buffer lies within the range [Start,End).
    procedure Get_Iter_At_Mark
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Mark               : access Gtk.Text_Mark.Gtk_Text_Mark_Record'Class);
| Initialize Iter with the current position of Mark.
    procedure Get_Iter_At_Child_Anchor
      (Buffer             : access Gtk_Text_Buffer_Record;
       Iter               : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Anchor             : access Gtk.Text_Child.Gtk_Text_Child_Anchor_Record'Class);
| ???
    function Get_Modified
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Boolean;
| Whether the buffer has been modified since the last call to Set_Modified set the modification flag to False. Used for example to enable a "save" function in a text editor.
    procedure Set_Modified
      (Buffer             : access Gtk_Text_Buffer_Record;
       Setting            :        Boolean := True);
| 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 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.
    procedure Cut_Clipboard
      (Buffer             : access Gtk_Text_Buffer_Record;
       Clipboard          :        Gtk.Clipboard.Gtk_Clipboard;
       Default_Editable   :        Boolean := True);
| Copy the currently-selected text to the clipboard, then delete said text if it's editable. Default_Editable: default editability of the buffer.
    procedure Copy_Clipboard
      (Buffer             : access Gtk_Text_Buffer_Record;
       Clipboard          :        Gtk.Clipboard.Gtk_Clipboard);
| Copy the currently-selected text to the clipboard.
    procedure Paste_Clipboard
      (Buffer             : access Gtk_Text_Buffer_Record;
       Clipboard          :        Gtk.Clipboard.Gtk_Clipboard;
       Override_Location  :        Gtk.Text_Iter.Gtk_Text_Iter_Access
                           := null;
       Default_Editable   :        Boolean := True);
| Paste the clipboard contents at the insertion point, or at Override_Location if this parameter is not null. (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.)
    function Selection_Exists
      (Buffer             : access Gtk_Text_Buffer_Record)
       return Boolean;
| Return True if some text in the buffer is currently selected.
    procedure Get_Selection_Bounds
      (Buffer             : access Gtk_Text_Buffer_Record;
       Start              : out    Gtk.Text_Iter.Gtk_Text_Iter;
       The_End            : out    Gtk.Text_Iter.Gtk_Text_Iter;
       Result             : out    Boolean);
| Place 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. Result: whether the selection has nonzero length.
    function Delete_Selection
      (Buffer             : access Gtk_Text_Buffer_Record;
       Interactive        :        Boolean;
       Default_Editable   :        Boolean)
       return Boolean;
| Delete 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). Return value: whether there was a non-empty selection to delete.
    procedure Begin_User_Action
      (Buffer             : access Gtk_Text_Buffer_Record);
| Called to indicate that the buffer operations between here and a call to End_User_Action are part of a single user-visible operation. The operations between Begin_User_Action and End_User_Action can then be grouped when creating an undo stack. Gtk_Text_Buffer maintains a count of calls to Begin_User_Action that have not been closed with a call to 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 Insert_Interactive, automatically call begin/end user action around the buffer operations they perform, so there's no need to add extra calls if your user action consists solely of a single call to one of those functions.
    procedure End_User_Action
      (Buffer             : access Gtk_Text_Buffer_Record);
| Should be paired with a call to Begin_User_Action. See that function for a full explanation.
    function Get_Buffer
      (Iter               :        Gtk.Text_Iter.Gtk_Text_Iter)
       return Gtk_Text_Buffer;
| Return the buffer associated to the given Gtk_Text_Iterator.

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