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GtkComboBox: Add the format-entry-text signal.

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This provides more control over how the selected item is shown in
the entry.
Bug #631167
This commit is contained in:
Tristan Van Berkom 2011-10-06 11:14:38 +02:00 committed by Murray Cumming
parent f920ded541
commit 2677a7d5b9
6 changed files with 123 additions and 28 deletions
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104
gtk/gtkcombobox.c
View File

@ -41,6 +41,7 @@
#include "gtkseparator.h"
#include "gtkwindow.h"
#include "gtktypebuiltins.h"
#include "gtkmainprivate.h"
#include "gtkprivate.h"
#include <gobject/gvaluecollector.h>
@ -217,6 +218,7 @@ enum {
MOVE_ACTIVE,
POPUP,
POPDOWN,
FORMAT_ENTRY_TEXT,
LAST_SIGNAL
};
@ -421,7 +423,8 @@ static void gtk_combo_box_entry_contents_changed (GtkEntry *e
gpointer user_data);
static void gtk_combo_box_entry_active_changed (GtkComboBox *combo_box,
gpointer user_data);
static gchar *gtk_combo_box_format_entry_text (GtkComboBox *combo_box,
const gchar *path);
/* GtkBuildable method implementation */
static GtkBuildableIface *parent_buildable_iface;
@ -512,6 +515,8 @@ gtk_combo_box_class_init (GtkComboBoxClass *klass)
object_class->set_property = gtk_combo_box_set_property;
object_class->get_property = gtk_combo_box_get_property;
klass->format_entry_text = gtk_combo_box_format_entry_text;
/* signals */
/**
* GtkComboBox::changed:
@ -596,6 +601,58 @@ gtk_combo_box_class_init (GtkComboBoxClass *klass)
_gtk_marshal_BOOLEAN__VOID,
G_TYPE_BOOLEAN, 0);
/**
* GtkComboBox::format-entry-text:
* @combo: the object which received the signal
* @path: the GtkTreePath string from the combo box's current model to format text for
*
* For combo boxes that are created with an entry (See GtkComboBox:has-entry).
*
* A signal which allows you to change how the text displayed in a combo box's
* entry is displayed.
*
* Connect a signal handler which returns an allocated string representing
* @path. That string will then be used to set the text in the combo box's entry.
* The default signal handler uses the text from the GtkComboBox::entry-text-column
* model column.
*
* Here's an example signal handler which fetches data from the model and
* displays it in the entry.
* |[
* static gchar*
* format_entry_text_callback (GtkComboBox *combo,
* const gchar *path,
* gpointer user_data)
* {
* GtkTreeIter iter;
* GtkTreeModel model;
* gdouble value;
*
* model = gtk_combo_box_get_model (combo);
*
* gtk_tree_model_get_iter_from_string (model, &iter, path);
* gtk_tree_model_get (model, &iter,
* THE_DOUBLE_VALUE_COLUMN, &value,
* -1);
*
* return g_strdup_printf ("&percnt;g", value);
* }
* ]|
*
* Return value: (transfer full): a newly allocated string representing @path
* for the current GtkComboBox model.
*
* Since: 3.4
*/
combo_box_signals[FORMAT_ENTRY_TEXT] =
g_signal_new (I_("format-entry-text"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkComboBoxClass, format_entry_text),
_gtk_single_string_accumulator, NULL,
_gtk_marshal_STRING__STRING,
G_TYPE_STRING, 1, G_TYPE_STRING);
/* key bindings */
binding_set = gtk_binding_set_by_class (widget_class);
@ -4614,7 +4671,6 @@ static void
gtk_combo_box_entry_active_changed (GtkComboBox *combo_box,
gpointer user_data)
{
GtkComboBoxPrivate *priv = combo_box->priv;
GtkTreeModel *model;
GtkTreeIter iter;
@ -4624,26 +4680,58 @@ gtk_combo_box_entry_active_changed (GtkComboBox *combo_box,
if (entry)
{
GValue value = {0,};
GtkTreePath *path;
gchar *path_str;
gchar *text = NULL;
model = gtk_combo_box_get_model (combo_box);
path = gtk_tree_model_get_path (model, &iter);
path_str = gtk_tree_path_to_string (path);
g_signal_handlers_block_by_func (entry,
gtk_combo_box_entry_contents_changed,
combo_box);
model = gtk_combo_box_get_model (combo_box);
gtk_tree_model_get_value (model, &iter,
priv->text_column, &value);
g_object_set_property (G_OBJECT (entry), "text", &value);
g_value_unset (&value);
g_signal_emit (combo_box, combo_box_signals[FORMAT_ENTRY_TEXT], 0,
path_str, &text);
gtk_entry_set_text (entry, text);
g_signal_handlers_unblock_by_func (entry,
gtk_combo_box_entry_contents_changed,
combo_box);
gtk_tree_path_free (path);
g_free (text);
g_free (path_str);
}
}
}
static gchar *
gtk_combo_box_format_entry_text (GtkComboBox *combo_box,
const gchar *path)
{
GtkComboBoxPrivate *priv = combo_box->priv;
GtkTreeModel *model;
GtkTreeIter iter;
gchar *text = NULL;
if (priv->text_column >= 0)
{
model = gtk_combo_box_get_model (combo_box);
gtk_tree_model_get_iter_from_string (model, &iter, path);
gtk_tree_model_get (model, &iter,
priv->text_column, &text,
-1);
}
return text;
}
static GObject *
gtk_combo_box_constructor (GType type,
guint n_construct_properties,

5
gtk/gtkcombobox.h
View File

@ -54,13 +54,14 @@ struct _GtkComboBoxClass
GtkBinClass parent_class;
/* signals */
void (* changed) (GtkComboBox *combo_box);
void (* changed) (GtkComboBox *combo_box);
gchar *(* format_entry_text) (GtkComboBox *combo_box,
const gchar *path);
/* Padding for future expansion */
void (*_gtk_reserved1) (void);
void (*_gtk_reserved2) (void);
void (*_gtk_reserved3) (void);
void (*_gtk_reserved4) (void);
};

16
gtk/gtkmain.c
View File

@ -2643,3 +2643,19 @@ _gtk_boolean_handled_accumulator (GSignalInvocationHint *ihint,
return continue_emission;
}
gboolean
_gtk_single_string_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
{
gboolean continue_emission;
const gchar *str;
str = g_value_get_string (handler_return);
g_value_set_string (return_accu, str);
continue_emission = str == NULL;
return continue_emission;
}

5
gtk/gtkmainprivate.h
View File

@ -28,6 +28,11 @@ gboolean _gtk_boolean_handled_accumulator (GSignalInvocationHint *ihint,
const GValue *handler_return,
gpointer dummy);
gboolean _gtk_single_string_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy);
gchar *_gtk_get_lc_ctype (void);
gboolean _gtk_module_has_mixed_deps (GModule *module);

1
gtk/gtkmarshalers.list
View File

@ -50,6 +50,7 @@ ENUM:VOID
INT:POINTER
OBJECT:VOID
STRING:DOUBLE
STRING:STRING
VOID:DOUBLE
VOID:BOOLEAN
VOID:BOOLEAN,BOOLEAN,BOOLEAN

20
gtk/gtkscale.c
View File

@ -41,6 +41,7 @@
#include "gtkintl.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkmainprivate.h"
#include "a11y/gtkscaleaccessible.h"
@ -166,23 +167,6 @@ G_DEFINE_TYPE_WITH_CODE (GtkScale, gtk_scale, GTK_TYPE_RANGE,
gtk_scale_buildable_interface_init))
static gboolean
single_string_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
{
gboolean continue_emission;
const gchar *str;
str = g_value_get_string (handler_return);
g_value_set_string (return_accu, str);
continue_emission = str == NULL;
return continue_emission;
}
#define add_slider_binding(binding_set, keyval, mask, scroll) \
gtk_binding_entry_add_signal (binding_set, keyval, mask, \
I_("move-slider"), 1, \
@ -243,7 +227,7 @@ gtk_scale_class_init (GtkScaleClass *class)
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkScaleClass, format_value),
single_string_accumulator, NULL,
_gtk_single_string_accumulator, NULL,
_gtk_marshal_STRING__DOUBLE,
G_TYPE_STRING, 1,
G_TYPE_DOUBLE);