forked from AuroraMiddleware/gtk
cbb2129147
Tue May 15 10:11:59 2001 Owen Taylor <otaylor@redhat.com> * gtk/gtkpreview.c: Apply patch from John Margaglione converting from args to properties. (#51957) * gtk/gtkscale.c (gtk_scale_class_init): Move install property calls to after ->set_property call.
444 lines
11 KiB
C
444 lines
11 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 <math.h>
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#include "gtkintl.h"
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#include "gtkscale.h"
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#include "gtkmarshal.h"
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enum {
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PROP_0,
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PROP_DIGITS,
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PROP_DRAW_VALUE,
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PROP_VALUE_POS
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};
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enum {
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FORMAT_VALUE,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL];
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static void gtk_scale_class_init (GtkScaleClass *klass);
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static void gtk_scale_init (GtkScale *scale);
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static void gtk_scale_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 void gtk_scale_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_scale_map (GtkWidget *widget);
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static void gtk_scale_unmap (GtkWidget *widget);
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static void gtk_scale_draw_background (GtkRange *range);
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static GtkRangeClass *parent_class = NULL;
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GtkType
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gtk_scale_get_type (void)
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{
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static GtkType scale_type = 0;
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if (!scale_type)
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{
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static const GtkTypeInfo scale_info =
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{
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"GtkScale",
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sizeof (GtkScale),
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sizeof (GtkScaleClass),
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(GtkClassInitFunc) gtk_scale_class_init,
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(GtkObjectInitFunc) gtk_scale_init,
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/* reserved_1 */ NULL,
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/* reserved_2 */ NULL,
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(GtkClassInitFunc) NULL,
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};
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scale_type = gtk_type_unique (GTK_TYPE_RANGE, &scale_info);
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}
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return scale_type;
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}
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gboolean
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single_string_accumulator (GSignalInvocationHint *ihint,
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GValue *return_accu,
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const GValue *handler_return,
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gpointer dummy)
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{
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gboolean continue_emission;
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gchar *str;
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str = g_value_get_string (handler_return);
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g_value_set_string (return_accu, str);
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continue_emission = str == NULL;
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return continue_emission;
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}
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static void
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gtk_scale_class_init (GtkScaleClass *class)
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{
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GObjectClass *gobject_class;
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GtkObjectClass *object_class;
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GtkWidgetClass *widget_class;
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GtkRangeClass *range_class;
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gobject_class = G_OBJECT_CLASS (class);
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object_class = (GtkObjectClass*) class;
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range_class = (GtkRangeClass*) class;
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widget_class = (GtkWidgetClass*) class;
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parent_class = gtk_type_class (GTK_TYPE_RANGE);
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gobject_class->set_property = gtk_scale_set_property;
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gobject_class->get_property = gtk_scale_get_property;
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widget_class->map = gtk_scale_map;
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widget_class->unmap = gtk_scale_unmap;
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range_class->draw_background = gtk_scale_draw_background;
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signals[FORMAT_VALUE] =
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g_signal_newc ("format_value",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkScaleClass, format_value),
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single_string_accumulator, NULL,
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gtk_marshal_STRING__DOUBLE,
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G_TYPE_STRING, 1,
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G_TYPE_DOUBLE);
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g_object_class_install_property (gobject_class,
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PROP_DIGITS,
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g_param_spec_int ("digits",
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_("Digits"),
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_("The number of decimal places that are displayed in the value"),
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0,
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G_MAXINT,
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0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_DRAW_VALUE,
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g_param_spec_boolean ("draw_value",
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_("Draw Value"),
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_("Whether the current value is displayed as a string next to the slider"),
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FALSE,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_VALUE_POS,
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g_param_spec_enum ("value_pos",
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_("Value Position"),
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_("The position in which the current value is displayed"),
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GTK_TYPE_POSITION_TYPE,
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GTK_POS_LEFT,
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G_PARAM_READWRITE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_int ("slider_length",
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_("Slider Length"),
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_("Length of scale's slider"),
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0,
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G_MAXINT,
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31,
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G_PARAM_READABLE));
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class->value_spacing = 2;
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class->draw_value = NULL;
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}
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static void
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gtk_scale_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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{
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GtkScale *scale;
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scale = GTK_SCALE (object);
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switch (prop_id)
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{
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case PROP_DIGITS:
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gtk_scale_set_digits (scale, g_value_get_int (value));
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break;
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case PROP_DRAW_VALUE:
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gtk_scale_set_draw_value (scale, g_value_get_boolean (value));
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break;
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case PROP_VALUE_POS:
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gtk_scale_set_value_pos (scale, g_value_get_enum (value));
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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_scale_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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{
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GtkScale *scale;
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scale = GTK_SCALE (object);
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switch (prop_id)
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{
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case PROP_DIGITS:
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g_value_set_int (value, GTK_RANGE (scale)->digits);
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break;
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case PROP_DRAW_VALUE:
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g_value_set_boolean (value, scale->draw_value);
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break;
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case PROP_VALUE_POS:
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g_value_set_enum (value, scale->value_pos);
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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_scale_init (GtkScale *scale)
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{
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GTK_WIDGET_SET_FLAGS (scale, GTK_CAN_FOCUS);
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GTK_WIDGET_SET_FLAGS (scale, GTK_NO_WINDOW);
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GTK_RANGE (scale)->digits = 1;
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scale->draw_value = TRUE;
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scale->value_pos = GTK_POS_TOP;
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}
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static void
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gtk_scale_map (GtkWidget *widget)
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{
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GtkRange *range;
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g_return_if_fail (widget != NULL);
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g_return_if_fail (GTK_IS_SCALE (widget));
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GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
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range = GTK_RANGE (widget);
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gdk_window_show (range->trough);
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}
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static void
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gtk_scale_unmap (GtkWidget *widget)
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{
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GtkRange *range;
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g_return_if_fail (widget != NULL);
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g_return_if_fail (GTK_IS_SCALE (widget));
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GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
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range = GTK_RANGE (widget);
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if (GTK_WIDGET_NO_WINDOW (widget))
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gtk_widget_queue_clear (widget);
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gdk_window_hide (range->trough);
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}
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void
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gtk_scale_set_digits (GtkScale *scale,
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gint digits)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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digits = CLAMP (digits, -1, 16);
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if (GTK_RANGE (scale)->digits != digits)
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{
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GTK_RANGE (scale)->digits = digits;
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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g_object_notify (G_OBJECT (scale), "digits");
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}
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}
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void
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gtk_scale_set_draw_value (GtkScale *scale,
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gboolean draw_value)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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draw_value = draw_value != FALSE;
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if (scale->draw_value != draw_value)
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{
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scale->draw_value = draw_value;
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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g_object_notify (G_OBJECT (scale), "draw_value");
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}
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}
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void
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gtk_scale_set_value_pos (GtkScale *scale,
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GtkPositionType pos)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (scale->value_pos != pos)
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{
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scale->value_pos = pos;
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if (GTK_WIDGET_VISIBLE (scale) && GTK_WIDGET_MAPPED (scale))
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gtk_widget_queue_resize (GTK_WIDGET (scale));
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g_object_notify (G_OBJECT (scale), "value_pos");
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}
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}
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void
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gtk_scale_get_value_size (GtkScale *scale,
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gint *width,
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gint *height)
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{
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GtkRange *range;
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (scale->draw_value)
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{
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PangoLayout *layout;
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PangoRectangle logical_rect;
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gchar *txt;
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range = GTK_RANGE (scale);
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layout = gtk_widget_create_pango_layout (GTK_WIDGET (scale), NULL);
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txt = _gtk_scale_format_value (scale, range->adjustment->lower);
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pango_layout_set_text (layout, txt, -1);
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g_free (txt);
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pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
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if (width)
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*width = logical_rect.width;
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if (height)
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*height = logical_rect.height;
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txt = _gtk_scale_format_value (scale, range->adjustment->upper);
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pango_layout_set_text (layout, txt, -1);
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g_free (txt);
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pango_layout_get_pixel_extents (layout, NULL, &logical_rect);
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if (width)
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*width = MAX (*width, logical_rect.width);
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if (height)
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*height = MAX (*height, logical_rect.height);
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g_object_unref (G_OBJECT (layout));
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}
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else
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{
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if (width)
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*width = 0;
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if (height)
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*height = 0;
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}
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}
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gint
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gtk_scale_get_value_width (GtkScale *scale)
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{
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gint width;
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g_return_val_if_fail (scale != NULL, 0);
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g_return_val_if_fail (GTK_IS_SCALE (scale), 0);
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gtk_scale_get_value_size (scale, &width, NULL);
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return width;
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}
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void
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gtk_scale_draw_value (GtkScale *scale)
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{
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g_return_if_fail (scale != NULL);
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g_return_if_fail (GTK_IS_SCALE (scale));
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if (GTK_SCALE_GET_CLASS (scale)->draw_value)
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GTK_SCALE_GET_CLASS (scale)->draw_value (scale);
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}
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static void
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gtk_scale_draw_background (GtkRange *range)
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{
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g_return_if_fail (range != NULL);
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g_return_if_fail (GTK_IS_SCALE (range));
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gtk_scale_draw_value (GTK_SCALE (range));
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}
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/**
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* _gtk_scale_format_value:
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* @scale: a #GtkScale
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* @value: adjustment value
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*
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* Emits "format_value" signal to format the value, if no user
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* signal handlers, falls back to a default format.
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*
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* Return value: formatted value
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**/
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gchar*
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_gtk_scale_format_value (GtkScale *scale,
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gdouble value)
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{
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gchar *fmt = NULL;
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g_signal_emit (G_OBJECT (scale),
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signals[FORMAT_VALUE],
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0,
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value,
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&fmt);
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if (fmt)
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return fmt;
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else
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return g_strdup_printf ("%0.*f", GTK_RANGE (scale)->digits,
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value);
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}
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