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GtkAdjustment: add an auxiliary function

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This is going to be used in AtkValue implementations.
This commit is contained in:
Matthias Clasen 2011-06-28 00:38:20 -04:00
parent 98918137a8
commit 1ff2076cdd
5 changed files with 47 additions and 285 deletions
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230
gtk/a11y/gailadjustment.c
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@ -1,230 +0,0 @@
/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "gailadjustment.h"
static void gail_adjustment_class_init (GailAdjustmentClass *klass);
static void gail_adjustment_init (GailAdjustment *adjustment);
static void gail_adjustment_real_initialize (AtkObject *obj,
gpointer data);
static void atk_value_interface_init (AtkValueIface *iface);
static void gail_adjustment_get_current_value (AtkValue *obj,
GValue *value);
static void gail_adjustment_get_maximum_value (AtkValue *obj,
GValue *value);
static void gail_adjustment_get_minimum_value (AtkValue *obj,
GValue *value);
static void gail_adjustment_get_minimum_increment (AtkValue *obj,
GValue *value);
static gboolean gail_adjustment_set_current_value (AtkValue *obj,
const GValue *value);
G_DEFINE_TYPE_WITH_CODE (GailAdjustment, gail_adjustment, ATK_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
static void
gail_adjustment_class_init (GailAdjustmentClass *klass)
{
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
class->initialize = gail_adjustment_real_initialize;
}
static void
gail_adjustment_init (GailAdjustment *adjustment)
{
}
AtkObject*
gail_adjustment_new (GtkAdjustment *adjustment)
{
GObject *object;
AtkObject *atk_object;
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), NULL);
object = g_object_new (GAIL_TYPE_ADJUSTMENT, NULL);
atk_object = ATK_OBJECT (object);
atk_object_initialize (atk_object, adjustment);
return atk_object;
}
static void
gail_adjustment_real_initialize (AtkObject *obj,
gpointer data)
{
GtkAdjustment *adjustment;
GailAdjustment *gail_adjustment;
ATK_OBJECT_CLASS (gail_adjustment_parent_class)->initialize (obj, data);
adjustment = GTK_ADJUSTMENT (data);
obj->role = ATK_ROLE_UNKNOWN;
gail_adjustment = GAIL_ADJUSTMENT (obj);
gail_adjustment->adjustment = adjustment;
g_object_add_weak_pointer (G_OBJECT (adjustment),
(gpointer *) &gail_adjustment->adjustment);
}
static void
atk_value_interface_init (AtkValueIface *iface)
{
iface->get_current_value = gail_adjustment_get_current_value;
iface->get_maximum_value = gail_adjustment_get_maximum_value;
iface->get_minimum_value = gail_adjustment_get_minimum_value;
iface->get_minimum_increment = gail_adjustment_get_minimum_increment;
iface->set_current_value = gail_adjustment_set_current_value;
}
static void
gail_adjustment_get_current_value (AtkValue *obj,
GValue *value)
{
GtkAdjustment* adjustment;
gdouble current_value;
adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
if (adjustment == NULL)
{
/* State is defunct */
return;
}
current_value = gtk_adjustment_get_value (adjustment);
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value,current_value);
}
static void
gail_adjustment_get_maximum_value (AtkValue *obj,
GValue *value)
{
GtkAdjustment* adjustment;
gdouble maximum_value;
adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
if (adjustment == NULL)
{
/* State is defunct */
return;
}
maximum_value = gtk_adjustment_get_upper (adjustment);
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, maximum_value);
}
static void
gail_adjustment_get_minimum_value (AtkValue *obj,
GValue *value)
{
GtkAdjustment* adjustment;
gdouble minimum_value;
adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
if (adjustment == NULL)
{
/* State is defunct */
return;
}
minimum_value = gtk_adjustment_get_lower (adjustment);
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, minimum_value);
}
static void
gail_adjustment_get_minimum_increment (AtkValue *obj,
GValue *value)
{
GtkAdjustment* adjustment;
gdouble minimum_increment;
adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
if (adjustment == NULL)
{
/* State is defunct */
return;
}
if (gtk_adjustment_get_step_increment (adjustment) != 0 &&
gtk_adjustment_get_page_increment (adjustment) != 0)
{
if (ABS (gtk_adjustment_get_step_increment (adjustment)) < ABS (gtk_adjustment_get_page_increment (adjustment)))
minimum_increment = gtk_adjustment_get_step_increment (adjustment);
else
minimum_increment = gtk_adjustment_get_page_increment (adjustment);
}
else if (gtk_adjustment_get_step_increment (adjustment) == 0 &&
gtk_adjustment_get_page_increment (adjustment) == 0)
{
minimum_increment = 0;
}
else if (gtk_adjustment_get_step_increment (adjustment) == 0)
{
minimum_increment = gtk_adjustment_get_page_increment (adjustment);
}
else
{
minimum_increment = gtk_adjustment_get_step_increment (adjustment);
}
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, minimum_increment);
}
static gboolean
gail_adjustment_set_current_value (AtkValue *obj,
const GValue *value)
{
if (G_VALUE_HOLDS_DOUBLE (value))
{
GtkAdjustment* adjustment;
gdouble new_value;
adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
if (adjustment == NULL)
{
/* State is defunct */
return FALSE;
}
new_value = g_value_get_double (value);
gtk_adjustment_set_value (adjustment, new_value);
return TRUE;
}
else
return FALSE;
}

55
gtk/a11y/gailadjustment.h
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@ -1,55 +0,0 @@
/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001 Sun Microsystems Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GAIL_ADJUSTMENT_H__
#define __GAIL_ADJUSTMENT_H__
#include <atk/atk.h>
G_BEGIN_DECLS
#define GAIL_TYPE_ADJUSTMENT (gail_adjustment_get_type ())
#define GAIL_ADJUSTMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GAIL_TYPE_ADJUSTMENT, GailAdjustment))
#define GAIL_ADJUSTMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GAIL_TYPE_ADJUSTMENT, GailAdjustmentClass))
#define GAIL_IS_ADJUSTMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GAIL_TYPE_ADJUSTMENT))
#define GAIL_IS_ADJUSTMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GAIL_TYPE_ADJUSTMENT))
#define GAIL_ADJUSTMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GAIL_TYPE_ADJUSTMENT, GailAdjustmentClass))
typedef struct _GailAdjustment GailAdjustment;
typedef struct _GailAdjustmentClass GailAdjustmentClass;
struct _GailAdjustment
{
AtkObject parent;
GtkAdjustment *adjustment;
};
GType gail_adjustment_get_type (void);
struct _GailAdjustmentClass
{
AtkObjectClass parent_class;
};
AtkObject *gail_adjustment_new (GtkAdjustment *adjustment);
G_END_DECLS
#endif /* __GAIL_ADJUSTMENT_H__ */

1
gtk/gtk.symbols
View File

@ -157,6 +157,7 @@ gtk_adjustment_changed
gtk_adjustment_clamp_page
gtk_adjustment_configure
gtk_adjustment_get_lower
gtk_adjustment_get_minimum_increment
gtk_adjustment_get_page_increment
gtk_adjustment_get_page_size
gtk_adjustment_get_step_increment

44
gtk/gtkadjustment.c
View File

@ -809,3 +809,47 @@ gtk_adjustment_clamp_page (GtkAdjustment *adjustment,
if (need_emission)
gtk_adjustment_value_changed (adjustment);
}
/**
* gtk_adjustment_get_minimum_increment:
* @adjustment: a #GtkAdjustment
*
* Gets the smaller of step increment and page increment.
*
* Returns: the minimum increment of @adjustment
*
* Since: 3.2
*/
gdouble
gtk_adjustment_get_minimum_increment (GtkAdjustment *adjustment)
{
GtkAdjustmentPrivate *priv;
gdouble minimum_increment;
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0);
priv = adjustment->priv;
if (priv->step_increment != 0 && priv->page_increment != 0)
{
if (ABS (priv->step_increment) < ABS (priv->page_increment))
minimum_increment = priv->step_increment;
else
minimum_increment = priv->page_increment;
}
else if (priv->step_increment == 0 && priv->page_increment == 0)
{
minimum_increment = 0;
}
else if (priv->step_increment == 0)
{
minimum_increment = priv->page_increment;
}
else
{
minimum_increment = priv->step_increment;
}
return minimum_increment;
}

2
gtk/gtkadjustment.h
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@ -116,6 +116,8 @@ void gtk_adjustment_configure (GtkAdjustment *adjustment,
gdouble page_increment,
gdouble page_size);
gdouble gtk_adjustment_get_minimum_increment (GtkAdjustment *adjustment);
G_END_DECLS
#endif /* __GTK_ADJUSTMENT_H__ */