174 lines
7.1 KiB
C
174 lines
7.1 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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* Copyright (C) 2001 Red Hat, Inc.
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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 "config.h"
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#include "gtkscrollbar.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "a11y/gtkscrollbaraccessible.h"
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/**
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* SECTION:gtkscrollbar
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* @Short_description: A Scrollbar
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* @Title: GtkScrollbar
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* @See_also: #GtkAdjustment, #GtkScrolledWindow
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*
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* The #GtkScrollbar widget is a horizontal or vertical scrollbar,
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* depending on the value of the #GtkOrientable:orientation property.
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*
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* The position of the thumb in a scrollbar is controlled by the scroll
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* adjustments. See #GtkAdjustment for the fields in an adjustment - for
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* #GtkScrollbar, the #GtkAdjustment.value field represents the position
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* of the scrollbar, which must be between the #GtkAdjustment.lower field
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* and #GtkAdjustment.upper - #GtkAdjustment.page_size. The
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* #GtkAdjustment.page_size field represents the size of the visible
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* scrollable area. The #GtkAdjustment.step_increment and
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* #GtkAdjustment.page_increment fields are used when the user asks to
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* step down (using the small stepper arrows) or page down (using for
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* example the <keycap>PageDown</keycap> key).
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*/
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static void gtk_scrollbar_style_updated (GtkWidget *widget);
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G_DEFINE_TYPE (GtkScrollbar, gtk_scrollbar, GTK_TYPE_RANGE)
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static void
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gtk_scrollbar_class_init (GtkScrollbarClass *class)
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{
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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widget_class->style_updated = gtk_scrollbar_style_updated;
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_int ("min-slider-length",
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P_("Minimum Slider Length"),
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P_("Minimum length of scrollbar slider"),
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0,
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G_MAXINT,
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21,
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GTK_PARAM_READABLE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_boolean ("fixed-slider-length",
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P_("Fixed slider size"),
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P_("Don't change slider size, just lock it to the minimum length"),
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FALSE,
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GTK_PARAM_READABLE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_boolean ("has-backward-stepper",
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P_("Backward stepper"),
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P_("Display the standard backward arrow button"),
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TRUE,
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GTK_PARAM_READABLE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_boolean ("has-forward-stepper",
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P_("Forward stepper"),
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P_("Display the standard forward arrow button"),
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TRUE,
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GTK_PARAM_READABLE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_boolean ("has-secondary-backward-stepper",
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P_("Secondary backward stepper"),
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P_("Display a second backward arrow button on the opposite end of the scrollbar"),
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FALSE,
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GTK_PARAM_READABLE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_boolean ("has-secondary-forward-stepper",
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P_("Secondary forward stepper"),
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P_("Display a second forward arrow button on the opposite end of the scrollbar"),
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FALSE,
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GTK_PARAM_READABLE));
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gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLBAR_ACCESSIBLE);
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}
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static void
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gtk_scrollbar_init (GtkScrollbar *scrollbar)
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{
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GtkStyleContext *context;
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context = gtk_widget_get_style_context (GTK_WIDGET (scrollbar));
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gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCROLLBAR);
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}
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static void
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gtk_scrollbar_style_updated (GtkWidget *widget)
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{
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GtkRange *range = GTK_RANGE (widget);
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gint slider_length;
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gboolean fixed_size;
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gboolean has_a, has_b, has_c, has_d;
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gtk_widget_style_get (widget,
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"min-slider-length", &slider_length,
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"fixed-slider-length", &fixed_size,
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"has-backward-stepper", &has_a,
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"has-secondary-forward-stepper", &has_b,
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"has-secondary-backward-stepper", &has_c,
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"has-forward-stepper", &has_d,
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NULL);
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gtk_range_set_min_slider_size (range, slider_length);
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gtk_range_set_slider_size_fixed (range, fixed_size);
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_gtk_range_set_steppers (range,
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has_a, has_b, has_c, has_d);
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GTK_WIDGET_CLASS (gtk_scrollbar_parent_class)->style_updated (widget);
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}
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/**
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* gtk_scrollbar_new:
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* @orientation: the scrollbar's orientation.
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* @adjustment: (allow-none): the #GtkAdjustment to use, or %NULL to create a new adjustment.
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*
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* Creates a new scrollbar with the given orientation.
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*
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* Return value: the new #GtkScrollbar.
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*
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* Since: 3.0
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**/
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GtkWidget *
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gtk_scrollbar_new (GtkOrientation orientation,
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GtkAdjustment *adjustment)
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{
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g_return_val_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment),
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NULL);
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return g_object_new (GTK_TYPE_SCROLLBAR,
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"orientation", orientation,
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"adjustment", adjustment,
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NULL);
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}
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