Interface
GtkEditable
since: 4.0
Description [src]
interface Gtk.Editable : Gtk.Widget
GtkEditable
is an interface for text editing widgets.
Typical examples of editable widgets are GtkEntry
and
GtkSpinButton
. It contains functions for generically manipulating
an editable widget, a large number of action signals used for key bindings,
and several signals that an application can connect to modify the behavior
of a widget.
As an example of the latter usage, by connecting the following handler to
GtkEditable::insert-text
, an application can convert all entry
into a widget into uppercase.
Forcing entry to uppercase.
#include <ctype.h>
void
insert_text_handler (GtkEditable *editable,
const char *text,
int length,
int *position,
gpointer data)
{
char *result = g_utf8_strup (text, length);
g_signal_handlers_block_by_func (editable,
(gpointer) insert_text_handler, data);
gtk_editable_insert_text (editable, result, length, position);
g_signal_handlers_unblock_by_func (editable,
(gpointer) insert_text_handler, data);
g_signal_stop_emission_by_name (editable, "insert_text");
g_free (result);
}
Implementing GtkEditable
The most likely scenario for implementing GtkEditable
on your own widget
is that you will embed a GtkText
inside a complex widget, and want to
delegate the editable functionality to that text widget. GtkEditable
provides some utility functions to make this easy.
In your class_init function, call gtk_editable_install_properties()
,
passing the first available property ID:
static void
my_class_init (MyClass *class)
{
...
g_object_class_install_properties (object_class, NUM_PROPERTIES, props);
gtk_editable_install_properties (object_clas, NUM_PROPERTIES);
...
}
In your interface_init function for the GtkEditable
interface, provide
an implementation for the get_delegate vfunc that returns your text widget:
GtkEditable *
get_editable_delegate (GtkEditable *editable)
{
return GTK_EDITABLE (MY_WIDGET (editable)->text_widget);
}
static void
my_editable_init (GtkEditableInterface *iface)
{
iface->get_delegate = get_editable_delegate;
}
You don’t need to provide any other vfuncs. The default implementations work by forwarding to the delegate that the GtkEditableInterface.get_delegate() vfunc returns.
In your instance_init function, create your text widget, and then call
gtk_editable_init_delegate()
:
static void
my_widget_init (MyWidget *self)
{
...
self->text_widget = gtk_text_new ();
gtk_editable_init_delegate (GTK_EDITABLE (self));
...
}
In your dispose function, call gtk_editable_finish_delegate()
before
destroying your text widget:
static void
my_widget_dispose (GObject *object)
{
...
gtk_editable_finish_delegate (GTK_EDITABLE (self));
g_clear_pointer (&self->text_widget, gtk_widget_unparent);
...
}
Finally, use gtk_editable_delegate_set_property()
in your set_property
function (and similar for get_property
), to set the editable properties:
...
if (gtk_editable_delegate_set_property (object, prop_id, value, pspec))
return;
switch (prop_id)
...
It is important to note that if you create a GtkEditable
that uses
a delegate, the low level GtkEditable::insert-text
and
GtkEditable::delete-text
signals will be propagated from the
“wrapper” editable to the delegate, but they will not be propagated from
the delegate to the “wrapper” editable, as they would cause an infinite
recursion. If you wish to connect to the GtkEditable::insert-text
and GtkEditable::delete-text
signals, you will need to connect
to them on the delegate obtained via gtk_editable_get_delegate()
.
Available since: 4.0
Prerequisite
In order to implement Editable, your type must inherit fromGtkWidget
.
Functions
gtk_editable_delegate_get_property
Gets a property of the GtkEditable
delegate for object
.
since: 4.0
gtk_editable_delegate_set_property
Sets a property on the GtkEditable
delegate for object
.
since: 4.0
Instance methods
gtk_editable_delegate_get_accessible_platform_state
Retrieves the accessible platform state from the editable delegate.
since: 4.10
gtk_editable_get_delegate
Gets the GtkEditable
that editable
is delegating its
implementation to.
since: 4.0
gtk_editable_get_max_width_chars
Retrieves the desired maximum width of editable
, in characters.
since: 4.0
gtk_editable_get_position
Retrieves the current position of the cursor relative to the start of the content of the editable.
since: 4.0
gtk_editable_get_width_chars
Gets the number of characters of space reserved for the contents of the editable.
since: 4.0
gtk_editable_insert_text
Inserts length
bytes of text
into the contents of the
widget, at position position
.
since: 4.0
gtk_editable_set_editable
Determines if the user can edit the text in the editable widget.
since: 4.0
gtk_editable_set_enable_undo
If enabled, changes to editable
will be saved for undo/redo actions.
since: 4.0
gtk_editable_set_max_width_chars
Sets the desired maximum width in characters of editable
.
since: 4.0
gtk_editable_set_width_chars
Changes the size request of the editable to be about the
right size for n_chars
characters.
since: 4.0
Properties
Gtk.Editable:selection-bound
The position of the opposite end of the selection from the cursor in chars.
since: 4.0
Signals
Gtk.Editable::changed
Emitted at the end of a single user-visible operation on the contents.
since: 4.0
Interface structure
struct GtkEditableInterface {
GTypeInterface base_iface;
void (* insert_text) (
GtkEditable* editable,
const char* text,
int length,
int* position
);
void (* delete_text) (
GtkEditable* editable,
int start_pos,
int end_pos
);
void (* changed) (
GtkEditable* editable
);
const char* (* get_text) (
GtkEditable* editable
);
void (* do_insert_text) (
GtkEditable* editable,
const char* text,
int length,
int* position
);
void (* do_delete_text) (
GtkEditable* editable,
int start_pos,
int end_pos
);
gboolean (* get_selection_bounds) (
GtkEditable* editable,
int* start_pos,
int* end_pos
);
void (* set_selection_bounds) (
GtkEditable* editable,
int start_pos,
int end_pos
);
GtkEditable* (* get_delegate) (
GtkEditable* editable
);
}
Interface members
base_iface |
|
No description available. | |
insert_text |
|
No description available. | |
delete_text |
|
No description available. | |
changed |
|
No description available. | |
get_text |
|
No description available. | |
do_insert_text |
|
No description available. | |
do_delete_text |
|
No description available. | |
get_selection_bounds |
|
No description available. | |
set_selection_bounds |
|
No description available. | |
get_delegate |
|
No description available. |
Virtual methods
Gtk.Editable.do_insert_text
Inserts length
bytes of text
into the contents of the
widget, at position position
.
since: 4.0
Gtk.Editable.get_delegate
Gets the GtkEditable
that editable
is delegating its
implementation to.
since: 4.0
Gtk.Editable.insert_text
Inserts length
bytes of text
into the contents of the
widget, at position position
.
since: 4.0