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GtkSourceBufferGtkSourceBuffer — Text buffer object for GtkSourceView |
gboolean | check-brackets | Read / Write |
guint | escape-char | Read / Write |
gboolean | highlight | Read / Write |
GtkSourceLanguage * | language | Read / Write |
gint | max-undo-levels | Read / Write |
void | can-redo | Run Last |
void | can-undo | Run Last |
void | highlight-updated | Run Last |
void | marker-updated | Run Last |
The GtkSourceBuffer object is the model for GtkSourceView widgets. It extends the GtkTextBuffer object by adding features necessary to display and edit source code: syntax highlighting, bracket matching and markers. It also implements support for undo/redo operations.
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.
By default highlighting is enabled, but you can disable it with
gtk_source_buffer_set_highlight()
. This can be useful if you're not
using GtkSourceLanguage objects to set the highlighting patterns, and
instead you're manually adding GtkSourceTag objects to the buffer's
tag table.
GtkSourceBuffer *
gtk_source_buffer_new (GtkSourceTagTable *table
);
Creates a new source buffer.
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
the default tag table and then calling
gtk_source_buffer_set_language()
.
gboolean
gtk_source_buffer_get_check_brackets (GtkSourceBuffer *buffer
);
Determines whether bracket match highlighting is activated for the source buffer.
void gtk_source_buffer_set_check_brackets (GtkSourceBuffer *buffer
,gboolean check_brackets
);
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. You can specify the
style with the gtk_source_buffer_set_bracket_match_style()
function.
void gtk_source_buffer_set_bracket_match_style (GtkSourceBuffer *source_buffer
,const GtkSourceTagStyle *style
);
Sets the style used for highlighting matching brackets.
gboolean
gtk_source_buffer_get_highlight (GtkSourceBuffer *buffer
);
Determines whether text highlighting is activated in the source buffer.
void gtk_source_buffer_set_highlight (GtkSourceBuffer *buffer
,gboolean highlight
);
Controls whether text is highlighted in the buffer. If highlight
is TRUE
, the text will be highlighted according to the patterns
installed in the buffer (either set with
gtk_source_buffer_set_language()
or by adding individual
GtkSourceTag tags to the buffer's tag table). Otherwise, any
current highlighted text will be restored to the default buffer
style.
Tags not of GtkSourceTag type will not be removed by this option, and normal GtkTextTag priority settings apply when highlighting is enabled.
If not using a GtkSourceLanguage for setting the highlighting patterns in the buffer, it is recommended for performance reasons that you add all the GtkSourceTag tags with highlighting disabled and enable it when finished.
gint
gtk_source_buffer_get_max_undo_levels (GtkSourceBuffer *buffer
);
Determines the number of undo levels the buffer will track for buffer edits.
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.
A new action is started whenever the function
gtk_text_buffer_begin_user_action()
is called. In general, this
happens whenever the user presses any key which modifies the
buffer, but the undo manager will try to merge similar consecutive
actions, such as multiple character insertions into one action.
But, inserting a newline does start a new action.
GtkSourceLanguage *
gtk_source_buffer_get_language (GtkSourceBuffer *buffer
);
Determines the GtkSourceLanguage used by the buffer. The returned object should not be unreferenced by the user.
void gtk_source_buffer_set_language (GtkSourceBuffer *buffer
,GtkSourceLanguage *language
);
Sets the GtkSourceLanguage the source buffer will use, adding
GtkSourceTag tags with the language's patterns and setting the
escape character with gtk_source_buffer_set_escape_char()
. Note
that this will remove any GtkSourceTag tags currently in the
buffer's tag table. The buffer holds a reference to the language
set.
gunichar
gtk_source_buffer_get_escape_char (GtkSourceBuffer *buffer
);
Determines the escaping character used by the source buffer highlighting engine.
void gtk_source_buffer_set_escape_char (GtkSourceBuffer *buffer
,gunichar escape_char
);
Sets the escape character to be used by the highlighting engine.
When performing the initial analysis, the engine will discard a matching syntax pattern if it's prefixed with an odd number of escape characters. This allows for example to correctly highlight strings with escaped quotes embedded.
This setting affects only syntax patterns (i.e. those defined in GtkSyntaxTag tags).
gboolean
gtk_source_buffer_can_undo (GtkSourceBuffer *buffer
);
Determines whether a source buffer can undo the last action.
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).
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.
Actions are defined as groups of operations between a call to
gtk_text_buffer_begin_user_action()
and
gtk_text_buffer_end_user_action()
, or sequences of similar edits
(inserts or deletes) on the same line.
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.
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.
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.
GtkSourceMarker * gtk_source_buffer_create_marker (GtkSourceBuffer *buffer
,const gchar *name
,const gchar *type
,const GtkTextIter *where
);
Creates a marker in the buffer
of type type
. A marker is
semantically very similar to a GtkTextMark, except it has a type
which is used by the GtkSourceView displaying the buffer to show a
pixmap on the left margin, at the line the marker is in. Because
of this, a marker is generally associated to a line and not a
character position. Markers are also accessible through a position
or range in the buffer.
Markers are implemented using GtkTextMark, so all characteristics and restrictions to marks apply to markers too. These includes life cycle issues and "mark-set" and "mark-deleted" signal emissions.
Like a GtkTextMark, a GtkSourceMarker can be anonymous if the
passed name
is NULL
. Also, the buffer owns the markers so you
shouldn't unreference it.
Markers always have left gravity and are moved to the beginning of the line when the user deletes the line they were in. Also, if the user deletes a region of text which contained lines with markers, those are deleted.
Typical uses for a marker are bookmarks, breakpoints, current executing instruction indication in a source file, etc..
void gtk_source_buffer_move_marker (GtkSourceBuffer *buffer
,GtkSourceMarker *marker
,const GtkTextIter *where
);
Moves marker
to the new location where
.
void gtk_source_buffer_delete_marker (GtkSourceBuffer *buffer
,GtkSourceMarker *marker
);
Deletes marker
from the source buffer. The same conditions as for
GtkTextMark apply here. The marker is no longer accessible from
the buffer, but if you held a reference to it, it will not be
destroyed.
GtkSourceMarker * gtk_source_buffer_get_marker (GtkSourceBuffer *buffer
,const gchar *name
);
Looks up the GtkSourceMarker named name
in buffer
, returning
NULL
if it doesn't exists.
GSList * gtk_source_buffer_get_markers_in_region (GtkSourceBuffer *buffer
,const GtkTextIter *begin
,const GtkTextIter *end
);
Returns an ordered (by position) GSList of
GtkSourceMarker objects inside the region delimited by the
GtkTextIter begin
and end
. The iters may be in any order.
GtkSourceMarker *
gtk_source_buffer_get_first_marker (GtkSourceBuffer *buffer
);
Returns the first (nearest to the top of the buffer) marker in
buffer
.
GtkSourceMarker *
gtk_source_buffer_get_last_marker (GtkSourceBuffer *buffer
);
Returns the last (nearest to the bottom of the buffer) marker in
buffer
.
void gtk_source_buffer_get_iter_at_marker (GtkSourceBuffer *buffer
,GtkTextIter *iter
,GtkSourceMarker *marker
);
Initializes iter
at the location of marker
.
GtkSourceMarker * gtk_source_buffer_get_next_marker (GtkSourceBuffer *buffer
,GtkTextIter *iter
);
Returns the nearest marker to the right of iter
. If there are
multiple markers at the same position, this function will always
return the first one (from the internal linked list), even if
starting the search exactly at its location. You can get the
others using gtk_source_marker_next()
.
the GtkSourceMarker nearest to the right of iter
,
or NULL
if there are no more markers after iter
.
GtkSourceMarker * gtk_source_buffer_get_prev_marker (GtkSourceBuffer *buffer
,GtkTextIter *iter
);
Returns the nearest marker to the left of iter
. If there are
multiple markers at the same position, this function will always
return the last one (from the internal linked list), even if
starting the search exactly at its location. You can get the
others using gtk_source_marker_prev()
.
the GtkSourceMarker nearest to the left of iter
,
or NULL
if there are no more markers before iter
.
“check-brackets”
property “check-brackets” gboolean
Whether to check and highlight matching brackets.
Flags: Read / Write
Default value: TRUE
“escape-char”
property “escape-char” guint
Escaping character for syntax patterns.
Flags: Read / Write
Default value: 0
“highlight”
property “highlight” gboolean
Whether to highlight syntax in the buffer.
Flags: Read / Write
Default value: FALSE
“language”
property“language” GtkSourceLanguage *
Language object to get highlighting patterns from.
Flags: Read / Write
“can-redo”
signalvoid user_function (GtkSourceBuffer *sourcebuffer, gboolean arg1, gpointer user_data)
Emitted whenever there is a change in the buffer's ability to redo an operation.
sourcebuffer |
the object which received the signal. |
|
arg1 |
TRUE if the buffer can now perform an redo. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
“can-undo”
signalvoid user_function (GtkSourceBuffer *sourcebuffer, gboolean arg1, gpointer user_data)
Emitted whenever there is a change in the buffer's ability to undo an operation.
sourcebuffer |
the object which received the signal. |
|
arg1 |
TRUE if the buffer can now perform an undo. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
“highlight-updated”
signalvoid user_function (GtkSourceBuffer *sourcebuffer, GtkTextIter *arg1, GtkTextIter *arg2, gpointer user_data)
Emitted whenever the syntax highlighting information has been updated, so that views can request a redraw if the region changed is visible. Usually only view widgets displaying this buffer will be interested in this signal.
sourcebuffer |
the object which received the signal. |
|
arg1 |
GtkTextIter at the start of the updated region. |
|
arg2 |
GtkTextIter at the end of the updated region. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
“marker-updated”
signalvoid user_function (GtkSourceBuffer *sourcebuffer, GtkTextIter *arg1, gpointer user_data)
Emitted whenever a marker of sourcebuffer
has changed and needs to be
redisplayed by the view. A change in a marker's type or location can
trigger this signal.
Note that moving a marker causes the emission of this signal twice: one for the old location and one for the new.
sourcebuffer |
the object which received the signal. |
|
arg1 |
GtkTextIter at the location where the change occurred. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
There is an introduction document describing the basic concepts of the buffer/view interactions.
Check GtkTextBuffer for information about the base buffer; and GtkSourceView for examples on setting up the buffer to be displayed in a view widget.