forked from AuroraMiddleware/gtk
216 lines
8.5 KiB
C
216 lines
8.5 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 "gtkrangeprivate.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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/**
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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 properties 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 `Page Down` key).
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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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* ├── [button.down]
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* ├── [button.up]
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* ├── trough
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* │ ╰── slider
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* ├── [button.down]
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* ╰── [button.up]
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* ]|
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*
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* GtkScrollbar has a main CSS node with name scrollbar, and subnodes with
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* names trough and slider.
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*
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* The main 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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* If steppers are enabled, they are represented by up to four additional
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* subnodes with name button. These get the style classes .up and .down to
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* indicate in which direction they are moving.
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*
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* Other style classes that may be added to scrollbars inside #GtkScrolledWindow
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* include the positional classes (.left, .right, .top, .bottom) and style
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* classes related to overlay scrolling (.overlay-indicator, .dragging, .hovering).
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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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/**
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* GtkScrollbar:min-slider-length:
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*
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* Minimum length of scrollbar slider.
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*
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* Deprecated: 3.20: Use min-height/min-width CSS properties on the slider
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* element instead. The value of this style property is ignored.
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*/
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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|G_PARAM_DEPRECATED));
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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_role (widget_class, ATK_ROLE_SCROLL_BAR);
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gtk_widget_class_set_css_name (widget_class, "scrollbar");
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}
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static void
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gtk_scrollbar_update_style (GtkScrollbar *scrollbar)
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{
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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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GtkRange *range = GTK_RANGE (scrollbar);
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GtkWidget *widget = GTK_WIDGET (scrollbar);
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GtkCssGadget *slider_gadget = gtk_range_get_slider_gadget (range);
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gtk_css_gadget_get_preferred_size (slider_gadget,
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gtk_orientable_get_orientation (GTK_ORIENTABLE (scrollbar)), -1,
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&slider_length, NULL,
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NULL, NULL);
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gtk_widget_style_get (widget,
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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, has_a, has_b, has_c, has_d);
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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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gtk_scrollbar_update_style (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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gtk_scrollbar_update_style (GTK_SCROLLBAR (widget));
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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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* Returns: 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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