forked from AuroraMiddleware/gtk
9f35c7ae42
Tue Feb 3 13:39:27 2004 Manish Singh <yosh@gimp.org>
* gtk/gtkadjustment.c (gtk_adjustment_new): pass value in last
in g_object_new, since it depends on lower and upper being set.
374 lines
10 KiB
C
374 lines
10 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "gtkadjustment.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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enum
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{
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PROP_0,
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PROP_VALUE,
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PROP_LOWER,
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PROP_UPPER,
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PROP_STEP_INCREMENT,
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PROP_PAGE_INCREMENT,
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PROP_PAGE_SIZE
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};
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enum {
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CHANGED,
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VALUE_CHANGED,
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LAST_SIGNAL
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};
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static void gtk_adjustment_class_init (GtkAdjustmentClass *klass);
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static void gtk_adjustment_init (GtkAdjustment *adjustment);
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static void gtk_adjustment_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void gtk_adjustment_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static guint adjustment_signals[LAST_SIGNAL] = { 0 };
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GType
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gtk_adjustment_get_type (void)
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{
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static GType adjustment_type = 0;
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if (!adjustment_type)
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{
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static const GTypeInfo adjustment_info =
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{
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sizeof (GtkAdjustmentClass),
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NULL, /* base_init */
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NULL, /* base_finalize */
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(GClassInitFunc) gtk_adjustment_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GtkAdjustment),
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0, /* n_preallocs */
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(GInstanceInitFunc) gtk_adjustment_init,
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};
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adjustment_type =
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g_type_register_static (GTK_TYPE_OBJECT, "GtkAdjustment",
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&adjustment_info, 0);
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}
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return adjustment_type;
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}
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static void
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gtk_adjustment_class_init (GtkAdjustmentClass *class)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (class);
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gobject_class->set_property = gtk_adjustment_set_property;
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gobject_class->get_property = gtk_adjustment_get_property;
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class->changed = NULL;
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class->value_changed = NULL;
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g_object_class_install_property (gobject_class,
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PROP_VALUE,
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g_param_spec_double ("value",
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P_("Value"),
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P_("The value of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_LOWER,
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g_param_spec_double ("lower",
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P_("Minimum Value"),
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P_("The minimum value of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_UPPER,
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g_param_spec_double ("upper",
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P_("Maximum Value"),
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P_("The maximum value of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_STEP_INCREMENT,
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g_param_spec_double ("step-increment",
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P_("Step Increment"),
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P_("The step increment of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_PAGE_INCREMENT,
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g_param_spec_double ("page-increment",
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P_("Page Increment"),
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P_("The page increment of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_PAGE_SIZE,
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g_param_spec_double ("page-size",
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P_("Page Size"),
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P_("The page size of the adjustment"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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adjustment_signals[CHANGED] =
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g_signal_new ("changed",
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G_OBJECT_CLASS_TYPE (class),
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G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
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G_STRUCT_OFFSET (GtkAdjustmentClass, changed),
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NULL, NULL,
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_gtk_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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adjustment_signals[VALUE_CHANGED] =
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g_signal_new ("value_changed",
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G_OBJECT_CLASS_TYPE (class),
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G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
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G_STRUCT_OFFSET (GtkAdjustmentClass, value_changed),
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NULL, NULL,
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_gtk_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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}
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static void
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gtk_adjustment_init (GtkAdjustment *adjustment)
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{
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adjustment->value = 0.0;
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adjustment->lower = 0.0;
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adjustment->upper = 0.0;
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adjustment->step_increment = 0.0;
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adjustment->page_increment = 0.0;
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adjustment->page_size = 0.0;
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}
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static void
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gtk_adjustment_get_property (GObject *object, guint prop_id, GValue *value,
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GParamSpec *pspec)
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{
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GtkAdjustment *adjustment = GTK_ADJUSTMENT (object);
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switch (prop_id)
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{
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case PROP_VALUE:
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g_value_set_double (value, adjustment->value);
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break;
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case PROP_LOWER:
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g_value_set_double (value, adjustment->lower);
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break;
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case PROP_UPPER:
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g_value_set_double (value, adjustment->upper);
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break;
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case PROP_STEP_INCREMENT:
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g_value_set_double (value, adjustment->step_increment);
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break;
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case PROP_PAGE_INCREMENT:
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g_value_set_double (value, adjustment->page_increment);
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break;
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case PROP_PAGE_SIZE:
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g_value_set_double (value, adjustment->page_size);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_adjustment_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GtkAdjustment *adjustment = GTK_ADJUSTMENT (object);
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gdouble double_value = g_value_get_double (value);
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switch (prop_id)
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{
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case PROP_VALUE:
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gtk_adjustment_set_value (GTK_ADJUSTMENT (object), double_value);
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break;
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case PROP_LOWER:
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if (adjustment->lower != double_value)
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{
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adjustment->lower = double_value;
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g_object_notify (G_OBJECT (adjustment), "lower");
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}
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break;
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case PROP_UPPER:
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if (adjustment->upper != double_value)
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{
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adjustment->upper = double_value;
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g_object_notify (G_OBJECT (adjustment), "upper");
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}
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break;
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case PROP_STEP_INCREMENT:
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if (adjustment->step_increment != double_value)
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{
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adjustment->step_increment = double_value;
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g_object_notify (G_OBJECT (adjustment), "step-increment");
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}
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break;
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case PROP_PAGE_INCREMENT:
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if (adjustment->page_increment != double_value)
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{
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adjustment->page_increment = double_value;
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g_object_notify (G_OBJECT (adjustment), "page-increment");
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}
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break;
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case PROP_PAGE_SIZE:
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if (adjustment->page_size != double_value)
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{
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adjustment->page_size = double_value;
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g_object_notify (G_OBJECT (adjustment), "page-size");
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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GtkObject*
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gtk_adjustment_new (gdouble value,
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gdouble lower,
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gdouble upper,
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gdouble step_increment,
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gdouble page_increment,
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gdouble page_size)
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{
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return g_object_new (GTK_TYPE_ADJUSTMENT,
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"lower", lower,
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"upper", upper,
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"step-increment", step_increment,
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"page-increment", page_increment,
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"page_size", page_size,
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"value", value,
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NULL);
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}
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/**
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* gtk_adjustment_get_value:
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* @adjustment: a #GtkAdjustment
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*
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* Gets the current value of the adjustment. See
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* gtk_adjustment_set_value ().
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*
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* Return value: The current value of the adjustment.
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**/
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gdouble
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gtk_adjustment_get_value (GtkAdjustment *adjustment)
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{
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g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.);
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return adjustment->value;
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}
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void
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gtk_adjustment_set_value (GtkAdjustment *adjustment,
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gdouble value)
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{
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g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
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value = CLAMP (value, adjustment->lower, adjustment->upper);
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if (value != adjustment->value)
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{
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adjustment->value = value;
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gtk_adjustment_value_changed (adjustment);
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}
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}
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void
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gtk_adjustment_changed (GtkAdjustment *adjustment)
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{
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g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
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g_signal_emit (adjustment, adjustment_signals[CHANGED], 0);
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}
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void
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gtk_adjustment_value_changed (GtkAdjustment *adjustment)
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{
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g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
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g_signal_emit (adjustment, adjustment_signals[VALUE_CHANGED], 0);
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g_object_notify (G_OBJECT (adjustment), "value");
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}
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void
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gtk_adjustment_clamp_page (GtkAdjustment *adjustment,
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gdouble lower,
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gdouble upper)
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{
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gboolean need_emission;
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g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
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lower = CLAMP (lower, adjustment->lower, adjustment->upper);
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upper = CLAMP (upper, adjustment->lower, adjustment->upper);
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need_emission = FALSE;
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if (adjustment->value + adjustment->page_size < upper)
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{
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adjustment->value = upper - adjustment->page_size;
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need_emission = TRUE;
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}
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if (adjustment->value > lower)
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{
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adjustment->value = lower;
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need_emission = TRUE;
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}
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if (need_emission)
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gtk_adjustment_value_changed (adjustment);
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}
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