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PIKApp/libpikawidgets/pikalabelspin.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikalabelspin.c
* Copyright (C) 2020 Jehan
*
* 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 3 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 Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikacolor/pikacolor.h"
#include "libpikamath/pikamath.h"
#include "libpikabase/pikabase.h"
#include "pikawidgets.h"
/**
* SECTION: pikalabelspin
* @title: PikaLabelSpin
* @short_description: Widget containing a spin button and a label.
*
* This widget is a subclass of #PikaLabeled with a #PikaSpinButton.
**/
enum
{
VALUE_CHANGED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_VALUE,
PROP_LOWER,
PROP_UPPER,
PROP_DIGITS,
};
typedef struct _PikaLabelSpinPrivate
{
PikaLabeled parent_instance;
GtkWidget *spinbutton;
GtkAdjustment *spin_adjustment;
gint digits;
} PikaLabelSpinPrivate;
static void pika_label_spin_constructed (GObject *object);
static void pika_label_spin_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_label_spin_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static GtkWidget * pika_label_spin_populate (PikaLabeled *spin,
gint *x,
gint *y,
gint *width,
gint *height);
static void pika_label_spin_update_spin_width (PikaLabelSpin *spin,
gdouble lower,
gdouble upper,
guint digits);
static void pika_label_spin_update_settings (PikaLabelSpin *spin);
G_DEFINE_TYPE_WITH_PRIVATE (PikaLabelSpin, pika_label_spin, PIKA_TYPE_LABELED)
#define parent_class pika_label_spin_parent_class
static guint pika_label_spin_signals[LAST_SIGNAL] = { 0 };
static void
pika_label_spin_class_init (PikaLabelSpinClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaLabeledClass *labeled_class = PIKA_LABELED_CLASS (klass);
pika_label_spin_signals[VALUE_CHANGED] =
g_signal_new ("value-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaLabelSpinClass, value_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->constructed = pika_label_spin_constructed;
object_class->set_property = pika_label_spin_set_property;
object_class->get_property = pika_label_spin_get_property;
labeled_class->populate = pika_label_spin_populate;
/**
* PikaLabelSpin:value:
*
* The currently set value.
*
* Since: 3.0
**/
g_object_class_install_property (object_class, PROP_VALUE,
g_param_spec_double ("value", NULL,
"Current value",
-G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
PIKA_PARAM_READWRITE));
/**
* PikaLabelSpin:lower:
*
* The lower bound of the spin button.
*
* Since: 3.0
**/
g_object_class_install_property (object_class, PROP_LOWER,
g_param_spec_double ("lower", NULL,
"Minimum value",
-G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* PikaLabelSpin:upper:
*
* The upper bound of the spin button.
*
* Since: 3.0
**/
g_object_class_install_property (object_class, PROP_UPPER,
g_param_spec_double ("upper", NULL,
"Max value",
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* PikaLabelSpin:digits:
*
* The number of decimal places to display. If -1, then the number is
* estimated.
*
* Since: 3.0
**/
g_object_class_install_property (object_class, PROP_DIGITS,
g_param_spec_int ("digits", NULL,
"The number of decimal places to display",
-1, G_MAXINT, -1,
PIKA_PARAM_READWRITE));
}
static void
pika_label_spin_init (PikaLabelSpin *spin)
{
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
/* We want the adjustment to exist at init so that construction
* properties can apply (default values are bogus but should be
* properly overridden with expected values if the object was created
* with pika_label_spin_new().
*/
priv->spin_adjustment = gtk_adjustment_new (0.0, 0.0, 100.0, 1.0, 10.0, 0.0);
gtk_grid_set_row_spacing (GTK_GRID (spin), 6);
gtk_grid_set_column_spacing (GTK_GRID (spin), 6);
}
static void
pika_label_spin_constructed (GObject *object)
{
PikaLabelSpin *spin = PIKA_LABEL_SPIN (object);
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
G_OBJECT_CLASS (parent_class)->constructed (object);
/* This is important to make this object into a property widget. It
* will allow config object to bind the "value" property of this
* widget, and therefore be updated automatically.
*/
g_object_bind_property (G_OBJECT (priv->spin_adjustment), "value",
G_OBJECT (spin), "value",
G_BINDING_BIDIRECTIONAL |
G_BINDING_SYNC_CREATE);
pika_label_spin_update_settings (spin);
}
static void
pika_label_spin_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaLabelSpin *spin = PIKA_LABEL_SPIN (object);
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
switch (property_id)
{
case PROP_VALUE:
/* Avoid looping forever since we have bound this widget's
* "value" property with the spin button "value" property.
*/
if (gtk_adjustment_get_value (priv->spin_adjustment) != g_value_get_double (value))
gtk_adjustment_set_value (priv->spin_adjustment, g_value_get_double (value));
g_signal_emit (object, pika_label_spin_signals[VALUE_CHANGED], 0);
break;
case PROP_LOWER:
gtk_adjustment_set_lower (priv->spin_adjustment,
g_value_get_double (value));
if (priv->spinbutton)
{
pika_label_spin_update_settings (spin);
}
break;
case PROP_UPPER:
gtk_adjustment_set_upper (priv->spin_adjustment,
g_value_get_double (value));
if (priv->spinbutton)
{
pika_label_spin_update_settings (spin);
}
break;
case PROP_DIGITS:
if (priv->spinbutton)
{
priv->digits = g_value_get_int (value);
pika_label_spin_update_settings (spin);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_label_spin_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaLabelSpin *spin = PIKA_LABEL_SPIN (object);
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
GtkSpinButton *spinbutton = GTK_SPIN_BUTTON (priv->spinbutton);
switch (property_id)
{
case PROP_VALUE:
g_value_set_double (value, gtk_adjustment_get_value (priv->spin_adjustment));
break;
case PROP_LOWER:
g_value_set_double (value, gtk_adjustment_get_lower (priv->spin_adjustment));
break;
case PROP_UPPER:
g_value_set_double (value, gtk_adjustment_get_upper (priv->spin_adjustment));
break;
case PROP_DIGITS:
g_value_set_uint (value, gtk_spin_button_get_digits (spinbutton));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static GtkWidget *
pika_label_spin_populate (PikaLabeled *labeled,
gint *x,
gint *y,
gint *width,
gint *height)
{
PikaLabelSpin *spin = PIKA_LABEL_SPIN (labeled);
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
priv->spinbutton = pika_spin_button_new (priv->spin_adjustment, 2.0, 2.0);
gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (priv->spinbutton), TRUE);
gtk_grid_attach (GTK_GRID (spin), priv->spinbutton, 1, 0, 1, 1);
gtk_widget_show (priv->spinbutton);
return priv->spinbutton;
}
static void
pika_label_spin_update_spin_width (PikaLabelSpin *spin,
gdouble lower,
gdouble upper,
guint digits)
{
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
gint width = 0;
g_return_if_fail (PIKA_IS_LABEL_SPIN (spin));
/* Necessary size to display the max/min integer values, with optional
* negative sign.
*/
width = (gint) floor (log10 (upper) + 1) + (upper < 0.0 ? 1 : 0);
width = MAX (width, (gint) floor (log10 (lower) + 1) + (lower < 0.0 ? 1 : 0));
/* Adding decimal digits and separator. */
width += (digits > 0 ? 1 + digits : 0);
/* Overlong spin button are useless. */
width = MIN (10, width);
gtk_entry_set_width_chars (GTK_ENTRY (priv->spinbutton), width);
}
static void
pika_label_spin_update_settings (PikaLabelSpin *spin)
{
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
gdouble lower;
gdouble upper;
gdouble step;
gdouble page;
gint digits = priv->digits;
g_return_if_fail (PIKA_IS_LABEL_SPIN (spin));
g_object_get (spin,
"lower", &lower,
"upper", &upper,
NULL);
g_return_if_fail (upper >= lower);
pika_range_estimate_settings (lower, upper, &step, &page,
digits < 0 ? &digits: NULL);
pika_label_spin_set_increments (spin, step, page);
gtk_spin_button_set_digits (GTK_SPIN_BUTTON (priv->spinbutton), (guint) digits);
pika_label_spin_update_spin_width (spin, lower, upper, (guint) digits);
}
/* Public Functions */
/**
* pika_label_spin_new:
* @text: The text for the #GtkLabel.
* @value: The initial value.
* @lower: The lower boundary.
* @upper: The upper boundary.
* @digits: The number of decimal digits.
*
* Suitable increment values are estimated based on the [@lower, @upper]
* range.
* If @digits is -1, then it will also be estimated based on the same
* range. Digits estimation will always be at least 1, so if you want to
* show integer values only, set 0 explicitly.
*
* Returns: (transfer full): The new #PikaLabelSpin widget.
**/
GtkWidget *
pika_label_spin_new (const gchar *text,
gdouble value,
gdouble lower,
gdouble upper,
gint digits)
{
GtkWidget *labeled;
g_return_val_if_fail (upper >= lower, NULL);
g_return_val_if_fail (digits >= -1, NULL);
labeled = g_object_new (PIKA_TYPE_LABEL_SPIN,
"label", text,
"value", value,
"lower", lower,
"upper", upper,
"digits", digits,
NULL);
return labeled;
}
/**
* pika_label_spin_set_value:
* @spin: The #GtkLabelSpin.
* @value: A new value.
*
* This function sets the value shown by @spin.
**/
void
pika_label_spin_set_value (PikaLabelSpin *spin,
gdouble value)
{
g_return_if_fail (PIKA_IS_LABEL_SPIN (spin));
g_object_set (spin,
"value", value,
NULL);
}
/**
* pika_label_spin_get_value:
* @spin: The #GtkLabelSpin.
*
* This function returns the value shown by @spin.
*
* Returns: The value currently set.
**/
gdouble
pika_label_spin_get_value (PikaLabelSpin *spin)
{
gdouble value;
g_return_val_if_fail (PIKA_IS_LABEL_SPIN (spin), 0.0);
g_object_get (spin,
"value", &value,
NULL);
return value;
}
/**
* pika_label_spin_set_increments:
* @spin: the #PikaLabelSpin.
* @step: the step increment.
* @page: the page increment.
*
* Set the step and page increments of the spin button.
* By default, these increment values are automatically computed
* depending on the range based on common usage. So you will likely not
* need to run this for most case. Yet if you want specific increments
* (which the widget cannot guess), you can call this function.
*/
void
pika_label_spin_set_increments (PikaLabelSpin *spin,
gdouble step,
gdouble page)
{
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
GtkSpinButton *spinbutton;
gdouble lower;
gdouble upper;
g_return_if_fail (PIKA_IS_LABEL_SPIN (spin));
g_return_if_fail (step <= page);
spinbutton = GTK_SPIN_BUTTON (priv->spinbutton);
gtk_spin_button_get_range (spinbutton, &lower, &upper);
g_return_if_fail (upper >= lower);
g_return_if_fail ((upper == lower || step <= upper - lower) &&
(upper == lower || page <= upper - lower));
g_object_freeze_notify (G_OBJECT (spinbutton));
gtk_adjustment_set_step_increment (gtk_spin_button_get_adjustment (spinbutton), step);
gtk_adjustment_set_page_increment (gtk_spin_button_get_adjustment (spinbutton), page);
g_object_thaw_notify (G_OBJECT (spinbutton));
g_object_set (priv->spinbutton,
"climb-rate", step,
NULL);
}
/**
* pika_label_spin_set_digits:
* @spin: the #PikaLabelSpin.
* @digits: the number of decimal places to display.
*
* Set the number of decimal place to display in the @spin's entry.
* If @digits is -1, then it will also be estimated based on @spin's
* range. Digits estimation will always be at least 1, so if you want to
* show integer values only, set 0 explicitly.
*/
void
pika_label_spin_set_digits (PikaLabelSpin *spin,
gint digits)
{
g_return_if_fail (PIKA_IS_LABEL_SPIN (spin));
g_object_set (spin,
"digits", digits,
NULL);
}
/**
* pika_label_spin_get_spin_button:
* @spin: The #PikaLabelSpin
*
* This function returns the #PikaSpinButton packed in @spin.
*
* Returns: (transfer none): The #PikaSpinButton contained in @spin.
**/
GtkWidget *
pika_label_spin_get_spin_button (PikaLabelSpin *spin)
{
PikaLabelSpinPrivate *priv = pika_label_spin_get_instance_private (spin);
g_return_val_if_fail (PIKA_IS_LABEL_SPIN (spin), NULL);
return priv->spinbutton;
}
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