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gtk2/modules/other/gail/gailscalebutton.c
Szilárd Pfeiffer d8a90be370 Fixed minimum increment calculation of GailScaleButton. 
Also implemented to use the adjustment to determine the current, minimum,
maximum values and mimimum increment just as the other widgets which have
adjustment.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=626710
2010-08-30 22:39:11 +02:00

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/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2008 Jan Arne Petersen
*
* 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 <gtk/gtk.h>
#include "gailscalebutton.h"
#include "gailadjustment.h"
#include "gail-private-macros.h"
#include <string.h>
static void gail_scale_button_class_init (GailScaleButtonClass *klass);
static void gail_scale_button_init (GailScaleButton *button);
/* GailWidget */
static void gail_scale_button_real_notify_gtk (GObject *obj,
GParamSpec *pspec);
/* AtkObject */
static void gail_scale_button_real_initialize (AtkObject *obj,
gpointer data);
/* AtkAction */
static void atk_action_interface_init (AtkActionIface *iface);
static gboolean gail_scale_button_do_action (AtkAction *action,
gint i);
static gint gail_scale_button_get_n_actions (AtkAction *action);
static G_CONST_RETURN gchar* gail_scale_button_get_description(AtkAction *action,
gint i);
static G_CONST_RETURN gchar* gail_scale_button_action_get_name(AtkAction *action,
gint i);
static G_CONST_RETURN gchar* gail_scale_button_get_keybinding (AtkAction *action,
gint i);
static gboolean gail_scale_button_set_description(AtkAction *action,
gint i,
const gchar *desc);
/* AtkValue */
static void atk_value_interface_init (AtkValueIface *iface);
static void gail_scale_button_get_current_value (AtkValue *obj,
GValue *value);
static void gail_scale_button_get_maximum_value (AtkValue *obj,
GValue *value);
static void gail_scale_button_get_minimum_value (AtkValue *obj,
GValue *value);
static void gail_scale_button_get_minimum_increment (AtkValue *obj,
GValue *value);
static gboolean gail_scale_button_set_current_value (AtkValue *obj,
const GValue *value);
static void gail_scale_button_value_changed (GtkAdjustment *adjustment,
gpointer data);
G_DEFINE_TYPE_WITH_CODE (GailScaleButton, gail_scale_button, GAIL_TYPE_BUTTON,
G_IMPLEMENT_INTERFACE (ATK_TYPE_ACTION, atk_action_interface_init)
G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init));
static void
gail_scale_button_class_init (GailScaleButtonClass *klass)
{
AtkObjectClass *atk_object_class = ATK_OBJECT_CLASS (klass);
GailWidgetClass *widget_class = GAIL_WIDGET_CLASS (klass);
atk_object_class->initialize = gail_scale_button_real_initialize;
widget_class->notify_gtk = gail_scale_button_real_notify_gtk;
}
static void
gail_scale_button_init (GailScaleButton *button)
{
}
static void
gail_scale_button_real_initialize (AtkObject *obj,
gpointer data)
{
GailScaleButton *scale_button = GAIL_SCALE_BUTTON (obj);
GtkScaleButton *gtk_scale_button;
GtkAdjustment *gtk_adjustment;
ATK_OBJECT_CLASS (gail_scale_button_parent_class)->initialize (obj, data);
gtk_scale_button = GTK_SCALE_BUTTON (data);
gtk_adjustment = gtk_scale_button_get_adjustment (gtk_scale_button);
/*
* If a GtkAdjustment already exists for the scale_button,
* create the GailAdjustment
*/
if (gtk_adjustment)
{
scale_button->adjustment = gail_adjustment_new (gtk_adjustment);
g_signal_connect (gtk_adjustment,
"value-changed",
G_CALLBACK (gail_scale_button_value_changed),
obj);
}
else
scale_button->adjustment = NULL;
obj->role = ATK_ROLE_SLIDER;
}
static void
atk_action_interface_init (AtkActionIface *iface)
{
iface->do_action = gail_scale_button_do_action;
iface->get_n_actions = gail_scale_button_get_n_actions;
iface->get_description = gail_scale_button_get_description;
iface->get_keybinding = gail_scale_button_get_keybinding;
iface->get_name = gail_scale_button_action_get_name;
iface->set_description = gail_scale_button_set_description;
}
static gboolean
gail_scale_button_do_action(AtkAction *action,
gint i)
{
GtkWidget *widget;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (action));
if (widget == NULL)
return FALSE;
if (!gtk_widget_is_sensitive (widget) || !gtk_widget_get_visible (widget))
return FALSE;
switch (i) {
case 0:
g_signal_emit_by_name (widget, "popup");
return TRUE;
case 1:
g_signal_emit_by_name (widget, "podown");
return TRUE;
default:
return FALSE;
}
}
static gint
gail_scale_button_get_n_actions (AtkAction *action)
{
return 2;
}
static G_CONST_RETURN gchar*
gail_scale_button_get_description (AtkAction *action,
gint i)
{
return NULL;
}
static G_CONST_RETURN gchar*
gail_scale_button_action_get_name (AtkAction *action,
gint i)
{
switch (i) {
case 0:
return "popup";
case 1:
return "popdown";
default:
return NULL;
}
}
static G_CONST_RETURN gchar*
gail_scale_button_get_keybinding (AtkAction *action,
gint i)
{
return NULL;
}
static gboolean
gail_scale_button_set_description (AtkAction *action,
gint i,
const gchar *desc)
{
return FALSE;
}
static void
atk_value_interface_init (AtkValueIface *iface)
{
iface->get_current_value = gail_scale_button_get_current_value;
iface->get_maximum_value = gail_scale_button_get_maximum_value;
iface->get_minimum_value = gail_scale_button_get_minimum_value;
iface->get_minimum_increment = gail_scale_button_get_minimum_increment;
iface->set_current_value = gail_scale_button_set_current_value;
}
static void
gail_scale_button_get_current_value (AtkValue *obj,
GValue *value)
{
GailScaleButton *scale_button;
g_return_if_fail (GAIL_IS_SCALE_BUTTON (obj));
scale_button = GAIL_SCALE_BUTTON (obj);
if (scale_button->adjustment == NULL)
/*
* Adjustment has not been specified
*/
return;
atk_value_get_current_value (ATK_VALUE (scale_button->adjustment), value);
}
static void
gail_scale_button_get_maximum_value (AtkValue *obj,
GValue *value)
{
GailScaleButton *scale_button;
g_return_if_fail (GAIL_IS_SCALE_BUTTON (obj));
scale_button = GAIL_SCALE_BUTTON (obj);
if (scale_button->adjustment == NULL)
/*
* Adjustment has not been specified
*/
return;
atk_value_get_maximum_value (ATK_VALUE (scale_button->adjustment), value);
}
static void
gail_scale_button_get_minimum_value (AtkValue *obj,
GValue *value)
{
GailScaleButton *scale_button;
g_return_if_fail (GAIL_IS_SCALE_BUTTON (obj));
scale_button = GAIL_SCALE_BUTTON (obj);
if (scale_button->adjustment == NULL)
/*
* Adjustment has not been specified
*/
return;
atk_value_get_minimum_value (ATK_VALUE (scale_button->adjustment), value);
}
static void
gail_scale_button_get_minimum_increment (AtkValue *obj,
GValue *value)
{
GailScaleButton *scale_button;
g_return_if_fail (GAIL_IS_SCALE_BUTTON (obj));
scale_button = GAIL_SCALE_BUTTON (obj);
if (scale_button->adjustment == NULL)
/*
* Adjustment has not been specified
*/
return;
atk_value_get_minimum_increment (ATK_VALUE (scale_button->adjustment), value);
}
static gboolean
gail_scale_button_set_current_value (AtkValue *obj,
const GValue *value)
{
GailScaleButton *scale_button;
g_return_val_if_fail (GAIL_IS_SCALE_BUTTON (obj), FALSE);
scale_button = GAIL_SCALE_BUTTON (obj);
if (scale_button->adjustment == NULL)
/*
* Adjustment has not been specified
*/
return FALSE;
return atk_value_set_current_value (ATK_VALUE (scale_button->adjustment), value);
}
static void
gail_scale_button_real_notify_gtk (GObject *obj,
GParamSpec *pspec)
{
GtkScaleButton *gtk_scale_button;
GailScaleButton *scale_button;
g_return_if_fail (GTK_IS_SCALE_BUTTON (obj));
gtk_scale_button = GTK_SCALE_BUTTON (obj);
scale_button = GAIL_SCALE_BUTTON (gtk_widget_get_accessible (GTK_WIDGET (gtk_scale_button)));
if (strcmp (pspec->name, "adjustment") == 0)
{
/*
* Get rid of the GailAdjustment for the GtkAdjustment
* which was associated with the scale_button.
*/
GtkAdjustment* gtk_adjustment;
if (scale_button->adjustment)
{
g_object_unref (scale_button->adjustment);
scale_button->adjustment = NULL;
}
/*
* Create the GailAdjustment when notify for "adjustment" property
* is received
*/
gtk_adjustment = gtk_scale_button_get_adjustment (gtk_scale_button);
scale_button->adjustment = gail_adjustment_new (gtk_adjustment);
g_signal_connect (gtk_adjustment,
"value-changed",
G_CALLBACK (gail_scale_button_value_changed),
scale_button);
}
else
{
GAIL_WIDGET_CLASS (gail_scale_button_parent_class)->notify_gtk (obj, pspec);
}
}
static void
gail_scale_button_value_changed (GtkAdjustment *adjustment,
gpointer data)
{
GailScaleButton *scale_button;
gail_return_if_fail (adjustment != NULL);
gail_return_if_fail (data != NULL);
scale_button = GAIL_SCALE_BUTTON (data);
g_object_notify (G_OBJECT (scale_button), "accessible-value");
}
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