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Properties
| gboolean | left-gravity | Read / Write / Construct Only |
| gchar * | name | Read / Write / Construct Only |
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.
A GtkTextMark is like a bookmark in a text buffer; it preserves a position in
the text. You can convert the mark to an iterator using
gtk_text_buffer_get_iter_at_mark(). Unlike iterators, marks remain valid across
buffer mutations, because their behavior is defined when text is inserted or
deleted. When text containing a mark is deleted, the mark remains in the
position originally occupied by the deleted text. When text is inserted at a
mark, a mark with “left gravity” will be moved to the
beginning of the newly-inserted text, and a mark with “right
gravity” will be moved to the end.
Note that “left” and “right” here refer to logical direction (left is the toward the start of the buffer); in some languages such as Hebrew the logically-leftmost text is not actually on the left when displayed.
Marks are reference counted, but the reference count only controls the validity
of the memory; marks can be deleted from the buffer at any time with
gtk_text_buffer_delete_mark(). Once deleted from the buffer, a mark is
essentially useless.
Marks optionally have names; these can be convenient to avoid passing the GtkTextMark object around.
Marks are typically created using the gtk_text_buffer_create_mark() function.
Functions
gtk_text_mark_new ()
GtkTextMark * gtk_text_mark_new (const gchar *name,gboolean left_gravity);
Creates a text mark. Add it to a buffer using gtk_text_buffer_add_mark().
If 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).
Parameters
name |
mark name or |
[allow-none] |
left_gravity |
whether the mark should have left gravity |
Since: 2.12
gtk_text_mark_set_visible ()
void gtk_text_mark_set_visible (GtkTextMark *mark,gboolean setting);
Sets the visibility of mark
; the insertion point is normally
visible, i.e. you can see it as a vertical bar. Also, the text
widget uses a visible mark to indicate where a drop will occur when
dragging-and-dropping text. Most other marks are not visible.
Marks are not visible by default.
gtk_text_mark_get_visible ()
gboolean
gtk_text_mark_get_visible (GtkTextMark *mark);
Returns TRUE if the mark is visible (i.e. a cursor is displayed
for it).
gtk_text_mark_get_deleted ()
gboolean
gtk_text_mark_get_deleted (GtkTextMark *mark);
Returns TRUE if the mark has been removed from its buffer
with gtk_text_buffer_delete_mark(). See gtk_text_buffer_add_mark()
for a way to add it to a buffer again.
gtk_text_mark_get_name ()
const gchar *
gtk_text_mark_get_name (GtkTextMark *mark);
Returns the mark name; returns NULL for anonymous marks.
gtk_text_mark_get_buffer ()
GtkTextBuffer *
gtk_text_mark_get_buffer (GtkTextMark *mark);
Gets the buffer this mark is located inside,
or NULL if the mark is deleted.
gtk_text_mark_get_left_gravity ()
gboolean
gtk_text_mark_get_left_gravity (GtkTextMark *mark);
Determines whether the mark has left gravity.
Property Details
The “left-gravity” property
“left-gravity” gboolean
Whether the mark has left gravity. When text is inserted at the mark’s current location, if the mark has left gravity it will be moved to the left of the newly-inserted text, otherwise to the right.
Flags: Read / Write / Construct Only
Default value: FALSE