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gtk2/gtk/gtkadjustment.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkadjustment.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkintl.h"
enum
{
PROP_0,
PROP_VALUE,
PROP_LOWER,
PROP_UPPER,
PROP_STEP_INCREMENT,
PROP_PAGE_INCREMENT,
PROP_PAGE_SIZE
};
enum
{
CHANGED,
VALUE_CHANGED,
LAST_SIGNAL
};
static void gtk_adjustment_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_adjustment_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_adjustment_dispatch_properties_changed (GObject *object,
guint n_pspecs,
GParamSpec **pspecs);
static guint adjustment_signals[LAST_SIGNAL] = { 0 };
static guint64 adjustment_changed_stamp = 0; /* protected by global gdk lock */
G_DEFINE_TYPE (GtkAdjustment, gtk_adjustment, GTK_TYPE_OBJECT)
static void
gtk_adjustment_class_init (GtkAdjustmentClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
gobject_class->set_property = gtk_adjustment_set_property;
gobject_class->get_property = gtk_adjustment_get_property;
gobject_class->dispatch_properties_changed = gtk_adjustment_dispatch_properties_changed;
class->changed = NULL;
class->value_changed = NULL;
/**
* GtkAdjustment:value:
*
* The value of the adjustment.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_VALUE,
g_param_spec_double ("value",
P_("Value"),
P_("The value of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
/**
* GtkAdjustment:lower:
*
* The minimum value of the adjustment.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_LOWER,
g_param_spec_double ("lower",
P_("Minimum Value"),
P_("The minimum value of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
/**
* GtkAdjustment:upper:
*
* The maximum value of the adjustment.
* Note that values will be restricted by
* <literal>upper - page-size</literal> if the page-size
* property is nonzero.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_UPPER,
g_param_spec_double ("upper",
P_("Maximum Value"),
P_("The maximum value of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
/**
* GtkAdjustment:step-increment:
*
* The step increment of the adjustment.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_STEP_INCREMENT,
g_param_spec_double ("step-increment",
P_("Step Increment"),
P_("The step increment of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
/**
* GtkAdjustment:page-increment:
*
* The page increment of the adjustment.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_PAGE_INCREMENT,
g_param_spec_double ("page-increment",
P_("Page Increment"),
P_("The page increment of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
/**
* GtkAdjustment:page-size:
*
* The page size of the adjustment.
* Note that the page-size is irrelevant and should be set to zero
* if the adjustment is used for a simple scalar value, e.g. in a
* #GtkSpinButton.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_PAGE_SIZE,
g_param_spec_double ("page-size",
P_("Page Size"),
P_("The page size of the adjustment"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GTK_PARAM_READWRITE));
adjustment_signals[CHANGED] =
g_signal_new (I_("changed"),
G_OBJECT_CLASS_TYPE (class),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
G_STRUCT_OFFSET (GtkAdjustmentClass, changed),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
adjustment_signals[VALUE_CHANGED] =
g_signal_new (I_("value-changed"),
G_OBJECT_CLASS_TYPE (class),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
G_STRUCT_OFFSET (GtkAdjustmentClass, value_changed),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
gtk_adjustment_init (GtkAdjustment *adjustment)
{
adjustment->value = 0.0;
adjustment->lower = 0.0;
adjustment->upper = 0.0;
adjustment->step_increment = 0.0;
adjustment->page_increment = 0.0;
adjustment->page_size = 0.0;
}
static void
gtk_adjustment_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkAdjustment *adjustment = GTK_ADJUSTMENT (object);
switch (prop_id)
{
case PROP_VALUE:
g_value_set_double (value, adjustment->value);
break;
case PROP_LOWER:
g_value_set_double (value, adjustment->lower);
break;
case PROP_UPPER:
g_value_set_double (value, adjustment->upper);
break;
case PROP_STEP_INCREMENT:
g_value_set_double (value, adjustment->step_increment);
break;
case PROP_PAGE_INCREMENT:
g_value_set_double (value, adjustment->page_increment);
break;
case PROP_PAGE_SIZE:
g_value_set_double (value, adjustment->page_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_adjustment_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkAdjustment *adjustment = GTK_ADJUSTMENT (object);
gdouble double_value = g_value_get_double (value);
switch (prop_id)
{
case PROP_VALUE:
gtk_adjustment_set_value (adjustment, double_value);
break;
case PROP_LOWER:
adjustment->lower = double_value;
break;
case PROP_UPPER:
adjustment->upper = double_value;
break;
case PROP_STEP_INCREMENT:
adjustment->step_increment = double_value;
break;
case PROP_PAGE_INCREMENT:
adjustment->page_increment = double_value;
break;
case PROP_PAGE_SIZE:
adjustment->page_size = double_value;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_adjustment_dispatch_properties_changed (GObject *object,
guint n_pspecs,
GParamSpec **pspecs)
{
gboolean changed = FALSE;
gint i;
G_OBJECT_CLASS (gtk_adjustment_parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs);
for (i = 0; i < n_pspecs; i++)
switch (pspecs[i]->param_id)
{
case PROP_LOWER:
case PROP_UPPER:
case PROP_STEP_INCREMENT:
case PROP_PAGE_INCREMENT:
case PROP_PAGE_SIZE:
changed = TRUE;
break;
default:
break;
}
if (changed)
{
adjustment_changed_stamp++;
gtk_adjustment_changed (GTK_ADJUSTMENT (object));
}
}
GtkObject *
gtk_adjustment_new (gdouble value,
gdouble lower,
gdouble upper,
gdouble step_increment,
gdouble page_increment,
gdouble page_size)
{
return g_object_new (GTK_TYPE_ADJUSTMENT,
"lower", lower,
"upper", upper,
"step-increment", step_increment,
"page-increment", page_increment,
"page-size", page_size,
"value", value,
NULL);
}
/**
* gtk_adjustment_get_value:
* @adjustment: a #GtkAdjustment
*
* Gets the current value of the adjustment. See
* gtk_adjustment_set_value ().
*
* Return value: The current value of the adjustment.
**/
gdouble
gtk_adjustment_get_value (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->value;
}
void
gtk_adjustment_set_value (GtkAdjustment *adjustment,
gdouble value)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
/* don't use CLAMP() so we don't end up below lower if upper - page_size
* is smaller than lower
*/
value = MIN (value, adjustment->upper - adjustment->page_size);
value = MAX (value, adjustment->lower);
if (value != adjustment->value)
{
adjustment->value = value;
gtk_adjustment_value_changed (adjustment);
}
}
/**
* gtk_adjustment_get_lower:
* @adjustment: a #GtkAdjustment
*
* Retrieves the minimum value of the adjustment.
*
* Return value: The current minimum value of the adjustment.
*
* Since: 2.14
**/
gdouble
gtk_adjustment_get_lower (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->lower;
}
/**
* gtk_adjustment_set_lower:
* @adjustment: a #GtkAdjustment
* @lower: the new minimum value
*
* Sets the minimum value of the adjustment.
*
* When setting multiple adjustment properties via their individual
* setters, multiple "changed" signals will be emitted. However, since
* the emission of the "changed" signal is tied to the emission of the
* "GObject::notify" signals of the changed properties, it's possible
* to compress the "changed" signals into one by calling
* g_object_freeze_notify() and g_object_thaw_notify() around the
* calls to the individual setters.
*
* Alternatively, using a single g_object_set() for all the properties
* to change, or using gtk_adjustment_configure() has the same effect
* of compressing "changed" emissions.
*
* Since: 2.14
**/
void
gtk_adjustment_set_lower (GtkAdjustment *adjustment,
gdouble lower)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (lower != adjustment->lower)
g_object_set (adjustment, "lower", lower, NULL);
}
/**
* gtk_adjustment_get_upper:
* @adjustment: a #GtkAdjustment
*
* Retrieves the maximum value of the adjustment.
*
* Return value: The current maximum value of the adjustment.
*
* Since: 2.14
**/
gdouble
gtk_adjustment_get_upper (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->upper;
}
/**
* gtk_adjustment_set_upper:
* @adjustment: a #GtkAdjustment
* @upper: the new maximum value
*
* Sets the maximum value of the adjustment.
*
* Note that values will be restricted by
* <literal>upper - page-size</literal> if the page-size
* property is nonzero.
*
* See gtk_adjustment_set_lower() about how to compress multiple
* emissions of the "changed" signal when setting multiple adjustment
* properties.
*
* Since: 2.14
**/
void
gtk_adjustment_set_upper (GtkAdjustment *adjustment,
gdouble upper)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (upper != adjustment->upper)
g_object_set (adjustment, "upper", upper, NULL);
}
/**
* gtk_adjustment_get_step_increment:
* @adjustment: a #GtkAdjustment
*
* Retrieves the step increment of the adjustment.
*
* Return value: The current step increment of the adjustment.
*
* Since: 2.14
**/
gdouble
gtk_adjustment_get_step_increment (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->step_increment;
}
/**
* gtk_adjustment_set_step_increment:
* @adjustment: a #GtkAdjustment
* @step_increment: the new step increment
*
* Sets the step increment of the adjustment.
*
* See gtk_adjustment_set_lower() about how to compress multiple
* emissions of the "changed" signal when setting multiple adjustment
* properties.
*
* Since: 2.14
**/
void
gtk_adjustment_set_step_increment (GtkAdjustment *adjustment,
gdouble step_increment)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (step_increment != adjustment->step_increment)
g_object_set (adjustment, "step-increment", step_increment, NULL);
}
/**
* gtk_adjustment_get_page_increment:
* @adjustment: a #GtkAdjustment
*
* Retrieves the page increment of the adjustment.
*
* Return value: The current page increment of the adjustment.
*
* Since: 2.14
**/
gdouble
gtk_adjustment_get_page_increment (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->page_increment;
}
/**
* gtk_adjustment_set_page_increment:
* @adjustment: a #GtkAdjustment
* @page_increment: the new page increment
*
* Sets the page increment of the adjustment.
*
* See gtk_adjustment_set_lower() about how to compress multiple
* emissions of the "changed" signal when setting multiple adjustment
* properties.
*
* Since: 2.14
**/
void
gtk_adjustment_set_page_increment (GtkAdjustment *adjustment,
gdouble page_increment)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (page_increment != adjustment->page_increment)
g_object_set (adjustment, "page-increment", page_increment, NULL);
}
/**
* gtk_adjustment_get_page_size:
* @adjustment: a #GtkAdjustment
*
* Retrieves the page size of the adjustment.
*
* Return value: The current page size of the adjustment.
*
* Since: 2.14
**/
gdouble
gtk_adjustment_get_page_size (GtkAdjustment *adjustment)
{
g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0);
return adjustment->page_size;
}
/**
* gtk_adjustment_set_page_size:
* @adjustment: a #GtkAdjustment
* @page_size: the new page size
*
* Sets the page size of the adjustment.
*
* See gtk_adjustment_set_lower() about how to compress multiple
* emissions of the "changed" signal when setting multiple adjustment
* properties.
*
* Since: 2.14
**/
void
gtk_adjustment_set_page_size (GtkAdjustment *adjustment,
gdouble page_size)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (page_size != adjustment->page_size)
g_object_set (adjustment, "page-size", page_size, NULL);
}
/**
* gtk_adjustment_configure:
* @adjustment: a #GtkAdjustment
* @value: the new value
* @lower: the new minimum value
* @upper: the new maximum value
* @step_increment: the new step increment
* @page_increment: the new page increment
* @page_size: the new page size
*
* Sets all properties of the adjustment at once.
*
* Use this function to avoid multiple emissions of the "changed"
* signal. See gtk_adjustment_set_lower() for an alternative way
* of compressing multiple emissions of "changed" into one.
*
* Since: 2.14
**/
void
gtk_adjustment_configure (GtkAdjustment *adjustment,
gdouble value,
gdouble lower,
gdouble upper,
gdouble step_increment,
gdouble page_increment,
gdouble page_size)
{
gboolean value_changed = FALSE;
guint64 old_stamp = adjustment_changed_stamp;
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
g_object_freeze_notify (G_OBJECT (adjustment));
g_object_set (adjustment,
"lower", lower,
"upper", upper,
"step-increment", step_increment,
"page-increment", page_increment,
"page-size", page_size,
NULL);
/* don't use CLAMP() so we don't end up below lower if upper - page_size
* is smaller than lower
*/
value = MIN (value, upper - page_size);
value = MAX (value, lower);
if (value != adjustment->value)
{
/* set value manually to make sure "changed" is emitted with the
* new value in place and is emitted before "value-changed"
*/
adjustment->value = value;
value_changed = TRUE;
}
g_object_thaw_notify (G_OBJECT (adjustment));
if (old_stamp == adjustment_changed_stamp)
gtk_adjustment_changed (adjustment); /* force emission before ::value-changed */
if (value_changed)
gtk_adjustment_value_changed (adjustment);
}
void
gtk_adjustment_changed (GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
g_signal_emit (adjustment, adjustment_signals[CHANGED], 0);
}
void
gtk_adjustment_value_changed (GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
g_signal_emit (adjustment, adjustment_signals[VALUE_CHANGED], 0);
g_object_notify (G_OBJECT (adjustment), "value");
}
void
gtk_adjustment_clamp_page (GtkAdjustment *adjustment,
gdouble lower,
gdouble upper)
{
gboolean need_emission;
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
lower = CLAMP (lower, adjustment->lower, adjustment->upper);
upper = CLAMP (upper, adjustment->lower, adjustment->upper);
need_emission = FALSE;
if (adjustment->value + adjustment->page_size < upper)
{
adjustment->value = upper - adjustment->page_size;
need_emission = TRUE;
}
if (adjustment->value > lower)
{
adjustment->value = lower;
need_emission = TRUE;
}
if (need_emission)
gtk_adjustment_value_changed (adjustment);
}
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