forked from AuroraMiddleware/gtk
364 lines
12 KiB
C
364 lines
12 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, see <http://www.gnu.org/licenses/>.
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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 "gtkrange.h"
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#include "gtkadjustment.h"
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#include "gtkintl.h"
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#include "gtkorientable.h"
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#include "gtkprivate.h"
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#include "gtkwidgetprivate.h"
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#include "gtkboxlayout.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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*
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* 
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*
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* Its position and movement are controlled by the adjustment that is passed to
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* or created by [ctor@Gtk.Scrollbar.new]. See [class.Gtk.Adjustment] for more
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* details. The [property@Gtk.Adjustment:value] field sets the position of the
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* thumb and must be between [property@Gtk.Adjustment:lower] and
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* [property@Gtk.Adjustment:upper] - [property@Gtk.Adjustment:page-size].
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* The [property@Gtk.Adjustment:page-size] represents the size of the visible
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* scrollable area.
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*
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* The fields [property@Gtk.Adjustment:step-increment] and
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* [property@Gtk.Adjustment:page-increment] fields are added to or subtracted
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* from the [property@Gtk.Adjustment:value] when the user asks to move by a step
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* (using e.g. the cursor arrow keys) or by a page (using e.g. the Page Down/Up
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* keys).
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*
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* # CSS nodes
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*
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* |[<!-- language="plain" -->
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* scrollbar
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* ╰── range[.fine-tune]
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* ╰── trough
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* ╰── slider
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* ]|
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*
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* `GtkScrollbar` has a main CSS node with name scrollbar and a subnode for its
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* contents. The main node gets the .horizontal or .vertical style classes applied,
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* depending on the scrollbar's orientation.
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*
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* The range node gets the style class .fine-tune added when the scrollbar is
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* in 'fine-tuning' mode.
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*
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* Other style classes that may be added to scrollbars inside
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* [class@Gtk.ScrolledWindow] include the positional classes (.left, .right,
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* .top, .bottom) and style classes related to overlay scrolling (.overlay-indicator,
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* .dragging, .hovering).
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*
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* # Accessibility
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*
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* `GtkScrollbar` uses the #GTK_ACCESSIBLE_ROLE_SCROLLBAR role.
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*/
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typedef struct _GtkScrollbarClass GtkScrollbarClass;
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struct _GtkScrollbar
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{
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GtkWidget parent_instance;
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};
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struct _GtkScrollbarClass
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{
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GtkWidgetClass parent_class;
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};
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typedef struct {
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GtkOrientation orientation;
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GtkWidget *range;
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} GtkScrollbarPrivate;
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enum {
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PROP_0,
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PROP_ADJUSTMENT,
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PROP_ORIENTATION,
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LAST_PROP = PROP_ORIENTATION
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};
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G_DEFINE_TYPE_WITH_CODE (GtkScrollbar, gtk_scrollbar, GTK_TYPE_WIDGET,
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G_ADD_PRIVATE (GtkScrollbar)
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G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
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static GParamSpec *props[LAST_PROP] = { NULL, };
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static void
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gtk_scrollbar_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkScrollbar *self = GTK_SCROLLBAR (object);
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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switch (property_id)
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{
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case PROP_ADJUSTMENT:
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g_value_set_object (value, gtk_scrollbar_get_adjustment (self));
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break;
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case PROP_ORIENTATION:
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g_value_set_enum (value, priv->orientation);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_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_scrollbar_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkScrollbar *self = GTK_SCROLLBAR (object);
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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switch (property_id)
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{
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case PROP_ADJUSTMENT:
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gtk_scrollbar_set_adjustment (self, g_value_get_object (value));
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break;
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case PROP_ORIENTATION:
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{
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GtkOrientation orientation = g_value_get_enum (value);
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if (orientation != priv->orientation)
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{
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GtkLayoutManager *layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
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gtk_orientable_set_orientation (GTK_ORIENTABLE (layout), orientation);
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gtk_orientable_set_orientation (GTK_ORIENTABLE (priv->range), orientation);
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priv->orientation = orientation;
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gtk_widget_update_orientation (GTK_WIDGET (self), priv->orientation);
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gtk_widget_queue_resize (GTK_WIDGET (self));
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g_object_notify_by_pspec (object, pspec);
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gtk_accessible_update_property (GTK_ACCESSIBLE (self),
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GTK_ACCESSIBLE_PROPERTY_ORIENTATION, orientation,
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-1);
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}
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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, property_id, pspec);
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break;
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}
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}
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static void gtk_scrollbar_adjustment_changed (GtkAdjustment *adjustment,
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gpointer data);
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static void gtk_scrollbar_adjustment_value_changed (GtkAdjustment *adjustment,
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gpointer data);
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static void
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gtk_scrollbar_dispose (GObject *object)
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{
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GtkScrollbar *self = GTK_SCROLLBAR (object);
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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GtkAdjustment *adj;
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adj = gtk_range_get_adjustment (GTK_RANGE (priv->range));
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if (adj)
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{
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g_signal_handlers_disconnect_by_func (adj, gtk_scrollbar_adjustment_changed, self);
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g_signal_handlers_disconnect_by_func (adj, gtk_scrollbar_adjustment_value_changed, self);
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}
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g_clear_pointer (&priv->range, gtk_widget_unparent);
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G_OBJECT_CLASS (gtk_scrollbar_parent_class)->dispose (object);
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}
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static void
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gtk_scrollbar_class_init (GtkScrollbarClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->get_property = gtk_scrollbar_get_property;
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object_class->set_property = gtk_scrollbar_set_property;
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object_class->dispose = gtk_scrollbar_dispose;
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/**
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* GtkScrollbar:adjustment:
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*
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* The `GtkAdjustment` controlled by this scrollbar.
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*/
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props[PROP_ADJUSTMENT] =
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g_param_spec_object ("adjustment",
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P_("Adjustment"),
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P_("The GtkAdjustment that contains the current value of this scrollbar"),
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GTK_TYPE_ADJUSTMENT,
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GTK_PARAM_READWRITE|G_PARAM_CONSTRUCT);
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g_object_class_install_properties (object_class, LAST_PROP, props);
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g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");
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gtk_widget_class_set_css_name (widget_class, I_("scrollbar"));
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gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
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gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_SCROLLBAR);
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}
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static void
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gtk_scrollbar_init (GtkScrollbar *self)
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{
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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priv->orientation = GTK_ORIENTATION_HORIZONTAL;
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priv->range = g_object_new (GTK_TYPE_RANGE, NULL);
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gtk_widget_set_hexpand (priv->range, TRUE);
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gtk_widget_set_vexpand (priv->range, TRUE);
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gtk_widget_set_parent (priv->range, GTK_WIDGET (self));
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gtk_widget_update_orientation (GTK_WIDGET (self), priv->orientation);
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gtk_accessible_update_property (GTK_ACCESSIBLE (self),
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GTK_ACCESSIBLE_PROPERTY_ORIENTATION, priv->orientation,
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-1);
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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 [class@Gtk.Adjustment] to use, or %NULL
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* 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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* Returns: the new `GtkScrollbar`.
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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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static void
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gtk_scrollbar_adjustment_changed (GtkAdjustment *adjustment,
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gpointer data)
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{
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GtkScrollbar *self = data;
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gtk_accessible_update_property (GTK_ACCESSIBLE (self),
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GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, gtk_adjustment_get_upper (adjustment),
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GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, gtk_adjustment_get_lower (adjustment),
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-1);
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}
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static void
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gtk_scrollbar_adjustment_value_changed (GtkAdjustment *adjustment,
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gpointer data)
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{
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GtkScrollbar *self = data;
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gtk_accessible_update_property (GTK_ACCESSIBLE (self),
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GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, gtk_adjustment_get_value (adjustment),
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-1);
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}
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/**
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* gtk_scrollbar_set_adjustment:
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* @self: a `GtkScrollbar`
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* @adjustment: (nullable): the adjustment to set
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*
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* Makes the scrollbar use the given adjustment.
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*/
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void
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gtk_scrollbar_set_adjustment (GtkScrollbar *self,
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GtkAdjustment *adjustment)
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{
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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GtkAdjustment *adj;
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g_return_if_fail (GTK_IS_SCROLLBAR (self));
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g_return_if_fail (adjustment == NULL || GTK_IS_ADJUSTMENT (adjustment));
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adj = gtk_range_get_adjustment (GTK_RANGE (priv->range));
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if (adj)
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{
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g_signal_handlers_disconnect_by_func (adj, gtk_scrollbar_adjustment_changed, self);
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g_signal_handlers_disconnect_by_func (adj, gtk_scrollbar_adjustment_value_changed, self);
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}
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gtk_range_set_adjustment (GTK_RANGE (priv->range), adjustment);
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if (adjustment)
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{
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g_signal_connect (adjustment, "changed",
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G_CALLBACK (gtk_scrollbar_adjustment_changed), self);
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g_signal_connect (adjustment, "value-changed",
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G_CALLBACK (gtk_scrollbar_adjustment_value_changed), self);
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gtk_accessible_update_property (GTK_ACCESSIBLE (self),
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GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, gtk_adjustment_get_upper (adjustment),
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GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, gtk_adjustment_get_lower (adjustment),
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GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, gtk_adjustment_get_value (adjustment),
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-1);
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}
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g_object_notify_by_pspec (G_OBJECT (self), props[PROP_ADJUSTMENT]);
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}
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/**
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* gtk_scrollbar_get_adjustment:
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* @self: a `GtkScrollbar`
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*
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* Returns the scrollbar's adjustment.
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*
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* Returns: (transfer none): the scrollbar's adjustment
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*/
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GtkAdjustment *
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gtk_scrollbar_get_adjustment (GtkScrollbar *self)
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{
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GtkScrollbarPrivate *priv = gtk_scrollbar_get_instance_private (self);
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g_return_val_if_fail (GTK_IS_SCROLLBAR (self), NULL);
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if (priv->range)
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return gtk_range_get_adjustment (GTK_RANGE (priv->range));
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return NULL;
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}
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