## GtkSourceBuffer

GtkSourceBuffer — Stores the text for display in a GtkSourceView

## Functions

GtkSourceBuffer * | gtk_source_buffer_new ()
GtkSourceBuffer * | gtk_source_buffer_new_with_language ()
void | gtk_source_buffer_set_highlight_syntax ()
gboolean | gtk_source_buffer_get_highlight_syntax ()
void | gtk_source_buffer_set_language ()
GtkSourceLanguage * | gtk_source_buffer_get_language ()
void | gtk_source_buffer_set_highlight_matching_brackets ()
gboolean | gtk_source_buffer_get_highlight_matching_brackets ()
void | gtk_source_buffer_set_style_scheme ()
GtkSourceStyleScheme * | gtk_source_buffer_get_style_scheme ()
void | gtk_source_buffer_ensure_highlight ()
void | gtk_source_buffer_undo ()
void | gtk_source_buffer_redo ()
gboolean | gtk_source_buffer_can_undo ()
gboolean | gtk_source_buffer_can_redo ()
void | gtk_source_buffer_begin_not_undoable_action ()
void | gtk_source_buffer_end_not_undoable_action ()
gint | gtk_source_buffer_get_max_undo_levels ()
void | gtk_source_buffer_set_max_undo_levels ()
GtkSourceUndoManager * | gtk_source_buffer_get_undo_manager ()
void | gtk_source_buffer_set_undo_manager ()
gboolean | gtk_source_buffer_iter_has_context_class ()
gchar ** | gtk_source_buffer_get_context_classes_at_iter ()
gboolean | gtk_source_buffer_iter_forward_to_context_class_toggle ()
gboolean | gtk_source_buffer_iter_backward_to_context_class_toggle ()
GtkSourceMark * | gtk_source_buffer_create_source_mark ()
gboolean | gtk_source_buffer_forward_iter_to_source_mark ()
gboolean | gtk_source_buffer_backward_iter_to_source_mark ()
GSList * | gtk_source_buffer_get_source_marks_at_line ()
GSList * | gtk_source_buffer_get_source_marks_at_iter ()
void | gtk_source_buffer_remove_source_marks ()
void | gtk_source_buffer_change_case ()
void | gtk_source_buffer_join_lines ()
void | gtk_source_buffer_set_implicit_trailing_newline ()
gboolean | gtk_source_buffer_get_implicit_trailing_newline ()

## Properties

gboolean | can-redo | Read
gboolean | can-undo | Read
gboolean | highlight-matching-brackets | Read / Write
gboolean | highlight-syntax | Read / Write
gboolean | implicit-trailing-newline | Read / Write / Construct
GtkSourceLanguage * | language | Read / Write
gint | max-undo-levels | Read / Write
GtkSourceStyleScheme * | style-scheme | Read / Write
GtkSourceUndoManager * | undo-manager | Read / Write / Construct

## Signals

void | bracket-matched | Run Last
void | highlight-updated | Run Last
void | redo | Run Last
void | source-mark-updated | Run Last
void | undo | Run Last

## Types and Values

| GtkSourceBuffer
enum | GtkSourceBracketMatchType
enum | GtkSourceChangeCaseType

## Object Hierarchy

        GObject
        ╰── GtkTextBuffer
            ╰── GtkSourceBuffer

## Includes

    #include <gtksourceview/gtksource.h>

## Description

A GtkSourceBuffer object is the model for GtkSourceView widgets. It extends the GtkTextBuffer class by adding features useful to display and edit source code such as syntax highlighting and bracket matching. It also implements support for the undo/redo.

To create a GtkSourceBuffer use `gtk_source_buffer_new()` or `gtk_source_buffer_new_with_language()`. The second form is just a convenience function which allows you to initially set a GtkSourceLanguage. You can also directly create a GtkSourceView and get its GtkSourceBuffer with `gtk_text_view_get_buffer()`.

The highlighting is enabled by default, but you can disable it with `gtk_source_buffer_set_highlight_syntax()`.

### Undo/Redo

A custom GtkSourceUndoManager can be implemented and set with `gtk_source_buffer_set_undo_manager()`. However the default implementation should be suitable for most uses, so you can use the API provided by GtkSourceBuffer instead of using GtkSourceUndoManager. By default, actions that can be undone or redone are defined as groups of operations between a call to `gtk_text_buffer_begin_user_action()` and `gtk_text_buffer_end_user_action()`. In general, this happens whenever the user presses any key which modifies the buffer. But the default undo manager will try to merge similar consecutive actions into one undo/redo level. The merging is done word by word, so after writing a new sentence (character by character), each undo will remove the previous word.

The default undo manager remembers the "modified" state of the buffer, and restores it when an action is undone or redone. It can be useful in a text editor to know whether the file is saved. See `gtk_text_buffer_get_modified()` and `gtk_text_buffer_set_modified()`.

The default undo manager also restores the selected text (or cursor position), if the selection was related to the action. For example if the user selects some text and deletes it, an undo will restore the selection. On the other hand, if some text is selected but a deletion occurs elsewhere (the deletion was done programmatically), an undo will not restore the selection, it will only moves the cursor (the cursor is moved so that the user sees the undo's effect). Warning: the selection restoring behavior might change in the future.

### Context Classes

It is possible to retrieve some information from the syntax highlighting engine. There are currently three default context classes that are applied to regions of a GtkSourceBuffer:

- comment: the region delimits a comment;

- string: the region delimits a string;

- no-spell-check: the region should not be spell checked.

Custom language definition files can create their own context classes, since the functions like `gtk_source_buffer_iter_has_context_class()` take a string parameter as the context class.

## Functions

### gtk_source_buffer_new ()

    GtkSourceBuffer *
    gtk_source_buffer_new (GtkTextTagTable *table);

Creates a new source buffer.

#### Parameters

table | a GtkTextTagTable, or `NULL` to create a new one. | [allow-none]

#### Returns

a new source buffer.

### gtk_source_buffer_new_with_language ()

    GtkSourceBuffer *
    gtk_source_buffer_new_with_language (GtkSourceLanguage *language);

Creates a new source buffer using the highlighting patterns in `language` . This is equivalent to creating a new source buffer with a new tag table and then calling `gtk_source_buffer_set_language()`.

#### Parameters

language | a GtkSourceLanguage. |

#### Returns

a new source buffer which will highlight text according to the highlighting patterns in `language` .

### gtk_source_buffer_set_highlight_syntax ()

    void
    gtk_source_buffer_set_highlight_syntax
                                   (GtkSourceBuffer *buffer,
                                    gboolean highlight);

Controls whether syntax is highlighted in the buffer. If `highlight` is `TRUE`, the text will be highlighted according to the syntax patterns specified in the language set with `gtk_source_buffer_set_language()`. If `highlight` is `FALSE`, syntax highlighting is disabled and all the GtkTextTag objects that have been added by the syntax highlighting engine are removed from the buffer.

#### Parameters

buffer | a GtkSourceBuffer. |
highlight | `TRUE` to enable syntax highlighting, `FALSE` to disable it. |

### gtk_source_buffer_get_highlight_syntax ()

    gboolean
    gtk_source_buffer_get_highlight_syntax
                                   (GtkSourceBuffer *buffer);

Determines whether syntax highlighting is activated in the source buffer.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

`TRUE` if syntax highlighting is enabled, `FALSE` otherwise.

### gtk_source_buffer_set_language ()

    void
    gtk_source_buffer_set_language (GtkSourceBuffer *buffer,
                                    GtkSourceLanguage *language);

Associate a GtkSourceLanguage with the buffer. If `language` is not-`NULL` and syntax highlighting is enabled (see `gtk_source_buffer_set_highlight_syntax()`), the syntax patterns defined in `language` will be used to highlight the text contained in the buffer. If `language` is `NULL`, the text contained in the buffer is not highlighted.

The buffer holds a reference to `language` .

#### Parameters

buffer | a GtkSourceBuffer. |
language | a GtkSourceLanguage to set, or `NULL`. | [allow-none]

### gtk_source_buffer_get_language ()

    GtkSourceLanguage *
    gtk_source_buffer_get_language (GtkSourceBuffer *buffer);

Returns the GtkSourceLanguage associated with the buffer, see `gtk_source_buffer_set_language()`. The returned object should not be unreferenced by the user.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

the GtkSourceLanguage associated with the buffer, or `NULL`.

[transfer none]

### gtk_source_buffer_set_highlight_matching_brackets ()

    void
    gtk_source_buffer_set_highlight_matching_brackets
                                   (GtkSourceBuffer *buffer,
                                    gboolean highlight);

Controls the bracket match highlighting function in the buffer. If activated, when you position your cursor over a bracket character (a parenthesis, a square bracket, etc.) the matching opening or closing bracket character will be highlighted.

#### Parameters

buffer | a GtkSourceBuffer. |
highlight | `TRUE` if you want matching brackets highlighted. |

### gtk_source_buffer_get_highlight_matching_brackets ()

    gboolean
    gtk_source_buffer_get_highlight_matching_brackets
                                   (GtkSourceBuffer *buffer);

Determines whether bracket match highlighting is activated for the source buffer.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

`TRUE` if the source buffer will highlight matching brackets.

### gtk_source_buffer_set_style_scheme ()

    void
    gtk_source_buffer_set_style_scheme (GtkSourceBuffer *buffer,
                                        GtkSourceStyleScheme *scheme);

Sets style scheme used by the buffer. If `scheme` is `NULL` no style scheme is used.

#### Parameters

buffer | a GtkSourceBuffer. |
scheme | a GtkSourceStyleScheme or `NULL`. | [allow-none]

### gtk_source_buffer_get_style_scheme ()

    GtkSourceStyleScheme *
    gtk_source_buffer_get_style_scheme (GtkSourceBuffer *buffer);

Returns the GtkSourceStyleScheme associated with the buffer, see `gtk_source_buffer_set_style_scheme()`. The returned object should not be unreferenced by the user.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

the GtkSourceStyleScheme associated with the buffer, or `NULL`.

[transfer none]

### gtk_source_buffer_ensure_highlight ()

    void
    gtk_source_buffer_ensure_highlight (GtkSourceBuffer *buffer,
                                        const GtkTextIter *start,
                                        const GtkTextIter *end);

Forces buffer to analyze and highlight the given area synchronously.

This is a potentially slow operation and should be used only when you need to make sure that some text not currently visible is highlighted, for instance before printing.

#### Parameters

buffer | a GtkSourceBuffer. |
start | start of the area to highlight. |
end | end of the area to highlight. |

### gtk_source_buffer_undo ()

    void
    gtk_source_buffer_undo (GtkSourceBuffer *buffer);

Undoes the last user action which modified the buffer. Use `gtk_source_buffer_can_undo()` to check whether a call to this function will have any effect.

This function emits the “undo” signal.

#### Parameters

buffer | a GtkSourceBuffer. |

### gtk_source_buffer_redo ()

    void
    gtk_source_buffer_redo (GtkSourceBuffer *buffer);

Redoes the last undo operation. Use `gtk_source_buffer_can_redo()` to check whether a call to this function will have any effect.

This function emits the “redo” signal.

#### Parameters

buffer | a GtkSourceBuffer. |

### gtk_source_buffer_can_undo ()

    gboolean
    gtk_source_buffer_can_undo (GtkSourceBuffer *buffer);

Determines whether a source buffer can undo the last action.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

`TRUE` if it's possible to undo the last action.

### gtk_source_buffer_can_redo ()

    gboolean
    gtk_source_buffer_can_redo (GtkSourceBuffer *buffer);

Determines whether a source buffer can redo the last action (i.e. if the last operation was an undo).

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

`TRUE` if a redo is possible.

### gtk_source_buffer_begin_not_undoable_action ()

    void
    gtk_source_buffer_begin_not_undoable_action
                                   (GtkSourceBuffer *buffer);

Marks the beginning of a not undoable action on the buffer, disabling the undo manager. Typically you would call this function before initially setting the contents of the buffer (e.g. when loading a file in a text editor).

You may nest `gtk_source_buffer_begin_not_undoable_action()` / `gtk_source_buffer_end_not_undoable_action()` blocks.

#### Parameters

buffer | a GtkSourceBuffer. |

### gtk_source_buffer_end_not_undoable_action ()

    void
    gtk_source_buffer_end_not_undoable_action
                                   (GtkSourceBuffer *buffer);

Marks the end of a not undoable action on the buffer. When the last not undoable block is closed through the call to this function, the list of undo actions is cleared and the undo manager is re-enabled.

#### Parameters

buffer | a GtkSourceBuffer. |

### gtk_source_buffer_get_max_undo_levels ()

    gint
    gtk_source_buffer_get_max_undo_levels (GtkSourceBuffer *buffer);

Determines the number of undo levels the buffer will track for buffer edits.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

the maximum number of possible undo levels or -1 if no limit is set.

### gtk_source_buffer_set_max_undo_levels ()

    void
    gtk_source_buffer_set_max_undo_levels (GtkSourceBuffer *buffer,
                                           gint max_undo_levels);

Sets the number of undo levels for user actions the buffer will track. If the number of user actions exceeds the limit set by this function, older actions will be discarded.

If `max_undo_levels` is -1, no limit is set.

#### Parameters

buffer | a GtkSourceBuffer. |
max_undo_levels | the desired maximum number of undo levels. |

### gtk_source_buffer_get_undo_manager ()

    GtkSourceUndoManager *
    gtk_source_buffer_get_undo_manager (GtkSourceBuffer *buffer);

Returns the GtkSourceUndoManager associated with the buffer, see `gtk_source_buffer_set_undo_manager()`. The returned object should not be unreferenced by the user.

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

the GtkSourceUndoManager associated with the buffer, or `NULL`.

[nullable][transfer none]

### gtk_source_buffer_set_undo_manager ()

    void
    gtk_source_buffer_set_undo_manager (GtkSourceBuffer *buffer,
                                        GtkSourceUndoManager *manager);

Set the buffer undo manager. If `manager` is `NULL` the default undo manager will be set.

#### Parameters

buffer | a GtkSourceBuffer. |
manager | A GtkSourceUndoManager or `NULL`. | [allow-none]

### gtk_source_buffer_iter_has_context_class ()

    gboolean
    gtk_source_buffer_iter_has_context_class
                                   (GtkSourceBuffer *buffer,
                                    const GtkTextIter *iter,
                                    const gchar *context_class);

Check if the class `context_class` is set on `iter` .

See the GtkSourceBuffer description for the list of default context classes.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | a GtkTextIter. |
context_class | class to search for. |

#### Returns

whether `iter` has the context class.

Since 2.10

### gtk_source_buffer_get_context_classes_at_iter ()

    gchar **
    gtk_source_buffer_get_context_classes_at_iter
                                   (GtkSourceBuffer *buffer,
                                    const GtkTextIter *iter);

Get all defined context classes at `iter` .

See the GtkSourceBuffer description for the list of default context classes.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | a GtkTextIter. |

#### Returns

a new `NULL` terminated array of context class names. Use `g_strfreev()` to free the array if it is no longer needed.

[array zero-terminated=1][transfer full]

Since 2.10

### gtk_source_buffer_iter_forward_to_context_class_toggle ()

    gboolean
    gtk_source_buffer_iter_forward_to_context_class_toggle
                                   (GtkSourceBuffer *buffer,
                                    GtkTextIter *iter,
                                    const gchar *context_class);

Moves forward to the next toggle (on or off) of the context class. If no matching context class toggles are found, returns `FALSE`, otherwise `TRUE`. Does not return toggles located at `iter` , only toggles after `iter` . Sets `iter` to the location of the toggle, or to the end of the buffer if no toggle is found.

See the GtkSourceBuffer description for the list of default context classes.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | a GtkTextIter. | [inout]
context_class | the context class. |

#### Returns

whether we found a context class toggle after `iter`

Since 2.10

### gtk_source_buffer_iter_backward_to_context_class_toggle ()

    gboolean
    gtk_source_buffer_iter_backward_to_context_class_toggle
                                   (GtkSourceBuffer *buffer,
                                    GtkTextIter *iter,
                                    const gchar *context_class);

Moves backward to the next toggle (on or off) of the context class. If no matching context class toggles are found, returns `FALSE`, otherwise `TRUE`. Does not return toggles located at `iter` , only toggles after `iter` . Sets `iter` to the location of the toggle, or to the end of the buffer if no toggle is found.

See the GtkSourceBuffer description for the list of default context classes.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | a GtkTextIter. | [inout]
context_class | the context class. |

#### Returns

whether we found a context class toggle before `iter`

Since 2.10

### gtk_source_buffer_create_source_mark ()

    GtkSourceMark *
    gtk_source_buffer_create_source_mark (GtkSourceBuffer *buffer,
                                          const gchar *name,
                                          const gchar *category,
                                          const GtkTextIter *where);

Creates a source mark in the `buffer` of category `category` . A source mark is a GtkTextMark but organised into categories. Depending on the category a pixbuf can be specified that will be displayed along the line of the mark.

Like a GtkTextMark, a GtkSourceMark can be anonymous if the passed `name` is `NULL`. Also, the buffer owns the marks so you shouldn't unreference it.

Marks always have left gravity and are moved to the beginning of the line when the user deletes the line they were in.

Typical uses for a source mark are bookmarks, breakpoints, current executing instruction indication in a source file, etc..

#### Parameters

buffer | a GtkSourceBuffer. |
name | the name of the mark, or `NULL`. | [allow-none]
category | a string defining the mark category. |
where | location to place the mark. |

#### Returns

a new GtkSourceMark, owned by the buffer.

[transfer none]

Since 2.2

### gtk_source_buffer_forward_iter_to_source_mark ()

    gboolean
    gtk_source_buffer_forward_iter_to_source_mark
                                   (GtkSourceBuffer *buffer,
                                    GtkTextIter *iter,
                                    const gchar *category);

Moves `iter` to the position of the next GtkSourceMark of the given `category` . Returns `TRUE` if `iter` was moved. If `category` is NULL, the next source mark can be of any category.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | an iterator. |
category | category to search for, or `NULL`. | [allow-none]

#### Returns

whether `iter` was moved.

Since 2.2

### gtk_source_buffer_backward_iter_to_source_mark ()

    gboolean
    gtk_source_buffer_backward_iter_to_source_mark
                                   (GtkSourceBuffer *buffer,
                                    GtkTextIter *iter,
                                    const gchar *category);

Moves `iter` to the position of the previous GtkSourceMark of the given category. Returns `TRUE` if `iter` was moved. If `category` is NULL, the previous source mark can be of any category.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | an iterator. |
category | category to search for, or `NULL`. | [allow-none]

#### Returns

whether `iter` was moved.

Since 2.2

### gtk_source_buffer_get_source_marks_at_line ()

    GSList *
    gtk_source_buffer_get_source_marks_at_line
                                   (GtkSourceBuffer *buffer,
                                    gint line,
                                    const gchar *category);

Returns the list of marks of the given category at `line` . If `category` is `NULL`, all marks at `line` are returned.

#### Parameters

buffer | a GtkSourceBuffer. |
line | a line number. |
category | category to search for, or `NULL`. | [allow-none]

#### Returns

a newly allocated GSList.

[element-type GtkSource.Mark][transfer container]

Since 2.2

### gtk_source_buffer_get_source_marks_at_iter ()

    GSList *
    gtk_source_buffer_get_source_marks_at_iter
                                   (GtkSourceBuffer *buffer,
                                    GtkTextIter *iter,
                                    const gchar *category);

Returns the list of marks of the given category at `iter` . If `category` is `NULL` it returns all marks at `iter` .

#### Parameters

buffer | a GtkSourceBuffer. |
iter | an iterator. |
category | category to search for, or `NULL`. | [allow-none]

#### Returns

a newly allocated GSList.

[element-type GtkSource.Mark][transfer container]

Since 2.2

### gtk_source_buffer_remove_source_marks ()

    void
    gtk_source_buffer_remove_source_marks (GtkSourceBuffer *buffer,
                                           const GtkTextIter *start,
                                           const GtkTextIter *end,
                                           const gchar *category);

Remove all marks of `category` between `start` and `end` from the buffer. If `category` is NULL, all marks in the range will be removed.

#### Parameters

buffer | a GtkSourceBuffer. |
start | a GtkTextIter. |
end | a GtkTextIter. |
category | category to search for, or `NULL`. | [allow-none]

Since 2.2

### gtk_source_buffer_change_case ()

    void
    gtk_source_buffer_change_case (GtkSourceBuffer *buffer,
                                   GtkSourceChangeCaseType case_type,
                                   GtkTextIter *start,
                                   GtkTextIter *end);

Changes the case of the text between the specified iterators.

#### Parameters

buffer | a GtkSourceBuffer. |
case_type | how to change the case. |
start | a GtkTextIter. |
end | a GtkTextIter. |

Since 3.12

### gtk_source_buffer_join_lines ()

    void
    gtk_source_buffer_join_lines (GtkSourceBuffer *buffer,
                                  GtkTextIter *start,
                                  GtkTextIter *end);

Joins the lines of text between the specified iterators.

#### Parameters

buffer | a GtkSourceBuffer. |
start | a GtkTextIter. |
end | a GtkTextIter. |

Since 3.16

### gtk_source_buffer_set_implicit_trailing_newline ()

    void
    gtk_source_buffer_set_implicit_trailing_newline
                                   (GtkSourceBuffer *buffer,
                                    gboolean implicit_trailing_newline);

Sets whether the `buffer` has an implicit trailing newline.

If an explicit trailing newline is present in a GtkTextBuffer, GtkTextView shows it as an empty line. This is generally not what the user expects.

If `implicit_trailing_newline` is `TRUE` (the default value):

- when a GtkSourceFileLoader loads the content of a file into the `buffer` , the trailing newline (if present in the file) is not inserted into the `buffer` .

- when a GtkSourceFileSaver saves the content of the `buffer` into a file, a trailing newline is added to the file.

On the other hand, if `implicit_trailing_newline` is `FALSE`, the file's content is not modified when loaded into the `buffer` , and the `buffer` 's content is not modified when saved into a file.

#### Parameters

buffer | a GtkSourceBuffer. |
implicit_trailing_newline | the new value. |

Since 3.14

### gtk_source_buffer_get_implicit_trailing_newline ()

    gboolean
    gtk_source_buffer_get_implicit_trailing_newline
                                   (GtkSourceBuffer *buffer);

#### Parameters

buffer | a GtkSourceBuffer. |

#### Returns

whether the `buffer` has an implicit trailing newline.

Since 3.14

## Types and Values

### GtkSourceBuffer

    typedef struct _GtkSourceBuffer GtkSourceBuffer;

### enum GtkSourceBracketMatchType

#### Members

GTK_SOURCE_BRACKET_MATCH_NONE | there is no bracket to match. |
GTK_SOURCE_BRACKET_MATCH_OUT_OF_RANGE | matching a bracket failed because the maximum range was reached. |
GTK_SOURCE_BRACKET_MATCH_NOT_FOUND | a matching bracket was not found. |
GTK_SOURCE_BRACKET_MATCH_FOUND | a matching bracket was found. |

### enum GtkSourceChangeCaseType

#### Members

GTK_SOURCE_CHANGE_CASE_LOWER | change case to lowercase. |
GTK_SOURCE_CHANGE_CASE_UPPER | change case to uppercase. |
GTK_SOURCE_CHANGE_CASE_TOGGLE | toggle case of each character. |
GTK_SOURCE_CHANGE_CASE_TITLE | capitalize each word. |

Since 3.12

## Property Details

### The `“can-redo”` property

      “can-redo”                 gboolean

Whether Redo operation is possible.

Flags: Read

Default value: FALSE

### The `“can-undo”` property

      “can-undo”                 gboolean

Whether Undo operation is possible.

Flags: Read

Default value: FALSE

### The `“highlight-matching-brackets”` property

      “highlight-matching-brackets” gboolean

Whether to highlight matching brackets in the buffer.

Flags: Read / Write

Default value: TRUE

### The `“highlight-syntax”` property

      “highlight-syntax”         gboolean

Whether to highlight syntax in the buffer.

Flags: Read / Write

Default value: TRUE

### The `“implicit-trailing-newline”` property

      “implicit-trailing-newline” gboolean

Whether the buffer has an implicit trailing newline. See `gtk_source_buffer_set_implicit_trailing_newline()`.

Flags: Read / Write / Construct

Default value: TRUE

Since 3.14

### The `“language”` property

      “language”                 GtkSourceLanguage *

Language object to get highlighting patterns from.

Flags: Read / Write

### The `“max-undo-levels”` property

      “max-undo-levels”          gint

Number of undo levels for the buffer. -1 means no limit. This property will only affect the default undo manager.

Flags: Read / Write

Allowed values: >= -1

Default value: -1

### The `“style-scheme”` property

      “style-scheme”             GtkSourceStyleScheme *

Style scheme. It contains styles for syntax highlighting, optionally foreground, background, cursor color, current line color, and matching brackets style.

Flags: Read / Write

### The `“undo-manager”` property

      “undo-manager”             GtkSourceUndoManager *

The buffer undo manager.

Flags: Read / Write / Construct

## Signal Details

### The `“bracket-matched”` signal

    void
    user_function (GtkSourceBuffer          *buffer,
                   GtkTextIter              *iter,
                   GtkSourceBracketMatchType state,
                   gpointer                  user_data)

Sets `iter` to a valid iterator pointing to the matching bracket if `state` is GTK_SOURCE_BRACKET_MATCH_FOUND. Otherwise `iter` is meaningless.

#### Parameters

buffer | a GtkSourceBuffer. |
iter | iterator to initialize. |
state | state of bracket matching |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since 2.12

### The `“highlight-updated”` signal

    void
    user_function (GtkSourceBuffer *buffer,
                   GtkTextIter     *start,
                   GtkTextIter     *end,
                   gpointer         user_data)

The ::highlight-updated signal is emitted when the syntax highlighting is updated in a certain region of the `buffer` . This signal is useful to be notified when a context class region is updated (e.g. the no-spell-check context class).

#### Parameters

buffer | the buffer that received the signal |
start | the start of the updated region |
end | the end of the updated region |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

### The `“redo”` signal

    void
    user_function (GtkSourceBuffer *buffer,
                   gpointer         user_data)

The ::redo signal is emitted to redo the last undo operation.

#### Parameters

buffer | the buffer that received the signal |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

### The `“source-mark-updated”` signal

    void
    user_function (GtkSourceBuffer *buffer,
                   GtkTextMark     *mark,
                   gpointer         user_data)

The ::source_mark_updated signal is emitted each time a mark is added to, moved or removed from the `buffer` .

#### Parameters

buffer | the buffer that received the signal |
mark | the GtkSourceMark |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

### The `“undo”` signal

    void
    user_function (GtkSourceBuffer *buffer,
                   gpointer         user_data)

The ::undo signal is emitted to undo the last user action which modified the buffer.

#### Parameters

buffer | the buffer that received the signal |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

## See Also

GtkTextBuffer, GtkSourceView