370 lines
11 KiB
C
370 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, 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 1997-2001. 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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/**
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* SECTION:gtkarrow
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* @Short_description: Displays an arrow
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* @Title: GtkArrow
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* @See_also: gtk_render_arrow()
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*
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* GtkArrow should be used to draw simple arrows that need to point in
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* one of the four cardinal directions (up, down, left, or right). The
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* style of the arrow can be one of shadow in, shadow out, etched in, or
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* etched out. Note that these directions and style types may be
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* amended in versions of GTK+ to come.
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*
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* GtkArrow will fill any space alloted to it, but since it is inherited
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* from #GtkMisc, it can be padded and/or aligned, to fill exactly the
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* space the programmer desires.
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*
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* Arrows are created with a call to gtk_arrow_new(). The direction or
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* style of an arrow can be changed after creation by using gtk_arrow_set().
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*/
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#include "config.h"
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#include <math.h>
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#include "gtkarrow.h"
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#include "gtksizerequest.h"
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#include "gtktypebuiltins.h"
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#include "gtkprivate.h"
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#include "gtkintl.h"
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#include "a11y/gtkarrowaccessible.h"
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#define MIN_ARROW_SIZE 15
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struct _GtkArrowPrivate
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{
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gint16 arrow_type;
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gint16 shadow_type;
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};
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enum {
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PROP_0,
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PROP_ARROW_TYPE,
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PROP_SHADOW_TYPE
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};
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static void gtk_arrow_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_arrow_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 gboolean gtk_arrow_draw (GtkWidget *widget,
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cairo_t *cr);
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static void gtk_arrow_get_preferred_width (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size);
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static void gtk_arrow_get_preferred_height (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size);
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G_DEFINE_TYPE (GtkArrow, gtk_arrow, GTK_TYPE_MISC)
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static void
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gtk_arrow_class_init (GtkArrowClass *class)
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{
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GObjectClass *gobject_class;
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GtkWidgetClass *widget_class;
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gobject_class = (GObjectClass*) class;
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widget_class = (GtkWidgetClass*) class;
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gobject_class->set_property = gtk_arrow_set_property;
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gobject_class->get_property = gtk_arrow_get_property;
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widget_class->draw = gtk_arrow_draw;
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widget_class->get_preferred_width = gtk_arrow_get_preferred_width;
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widget_class->get_preferred_height = gtk_arrow_get_preferred_height;
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g_object_class_install_property (gobject_class,
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PROP_ARROW_TYPE,
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g_param_spec_enum ("arrow-type",
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P_("Arrow direction"),
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P_("The direction the arrow should point"),
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GTK_TYPE_ARROW_TYPE,
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GTK_ARROW_RIGHT,
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GTK_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_SHADOW_TYPE,
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g_param_spec_enum ("shadow-type",
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P_("Arrow shadow"),
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P_("Appearance of the shadow surrounding the arrow"),
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GTK_TYPE_SHADOW_TYPE,
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GTK_SHADOW_OUT,
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GTK_PARAM_READWRITE));
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gtk_widget_class_install_style_property (widget_class,
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g_param_spec_float ("arrow-scaling",
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P_("Arrow Scaling"),
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P_("Amount of space used up by arrow"),
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0.0, 1.0, 0.7,
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GTK_PARAM_READABLE));
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g_type_class_add_private (class, sizeof (GtkArrowPrivate));
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gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_ARROW_ACCESSIBLE);
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}
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static void
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gtk_arrow_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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GtkArrow *arrow = GTK_ARROW (object);
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GtkArrowPrivate *priv = arrow->priv;
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switch (prop_id)
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{
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case PROP_ARROW_TYPE:
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gtk_arrow_set (arrow,
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g_value_get_enum (value),
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priv->shadow_type);
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break;
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case PROP_SHADOW_TYPE:
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gtk_arrow_set (arrow,
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priv->arrow_type,
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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_arrow_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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GtkArrow *arrow = GTK_ARROW (object);
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GtkArrowPrivate *priv = arrow->priv;
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switch (prop_id)
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{
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case PROP_ARROW_TYPE:
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g_value_set_enum (value, priv->arrow_type);
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break;
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case PROP_SHADOW_TYPE:
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g_value_set_enum (value, priv->shadow_type);
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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_arrow_init (GtkArrow *arrow)
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{
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GtkArrowPrivate *priv;
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arrow->priv = G_TYPE_INSTANCE_GET_PRIVATE (arrow,
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GTK_TYPE_ARROW,
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GtkArrowPrivate);
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priv = arrow->priv;
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gtk_widget_set_has_window (GTK_WIDGET (arrow), FALSE);
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priv->arrow_type = GTK_ARROW_RIGHT;
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priv->shadow_type = GTK_SHADOW_OUT;
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}
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static void
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gtk_arrow_get_preferred_width (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkBorder border;
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_gtk_misc_get_padding_and_border (GTK_MISC (widget), &border);
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if (minimum_size)
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*minimum_size = MIN_ARROW_SIZE + border.left + border.right;
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if (natural_size)
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*natural_size = MIN_ARROW_SIZE + border.left + border.right;
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}
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static void
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gtk_arrow_get_preferred_height (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkBorder border;
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_gtk_misc_get_padding_and_border (GTK_MISC (widget), &border);
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if (minimum_size)
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*minimum_size = MIN_ARROW_SIZE + border.top + border.bottom;
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if (natural_size)
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*natural_size = MIN_ARROW_SIZE + border.top + border.bottom;
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}
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/**
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* gtk_arrow_new:
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* @arrow_type: a valid #GtkArrowType.
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* @shadow_type: a valid #GtkShadowType.
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*
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* Creates a new #GtkArrow widget.
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*
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* Returns: the new #GtkArrow widget.
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*/
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GtkWidget*
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gtk_arrow_new (GtkArrowType arrow_type,
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GtkShadowType shadow_type)
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{
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GtkArrowPrivate *priv;
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GtkArrow *arrow;
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arrow = g_object_new (GTK_TYPE_ARROW, NULL);
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priv = arrow->priv;
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priv->arrow_type = arrow_type;
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priv->shadow_type = shadow_type;
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return GTK_WIDGET (arrow);
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}
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/**
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* gtk_arrow_set:
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* @arrow: a widget of type #GtkArrow.
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* @arrow_type: a valid #GtkArrowType.
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* @shadow_type: a valid #GtkShadowType.
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*
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* Sets the direction and style of the #GtkArrow, @arrow.
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*/
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void
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gtk_arrow_set (GtkArrow *arrow,
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GtkArrowType arrow_type,
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GtkShadowType shadow_type)
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{
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GtkArrowPrivate *priv;
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GtkWidget *widget;
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g_return_if_fail (GTK_IS_ARROW (arrow));
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priv = arrow->priv;
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if (priv->arrow_type != arrow_type
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|| priv->shadow_type != shadow_type)
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{
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g_object_freeze_notify (G_OBJECT (arrow));
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if ((GtkArrowType) priv->arrow_type != arrow_type)
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{
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priv->arrow_type = arrow_type;
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g_object_notify (G_OBJECT (arrow), "arrow-type");
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}
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if (priv->shadow_type != shadow_type)
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{
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priv->shadow_type = shadow_type;
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g_object_notify (G_OBJECT (arrow), "shadow-type");
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}
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g_object_thaw_notify (G_OBJECT (arrow));
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widget = GTK_WIDGET (arrow);
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if (gtk_widget_is_drawable (widget))
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gtk_widget_queue_draw (widget);
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}
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}
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static gboolean
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gtk_arrow_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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GtkArrow *arrow = GTK_ARROW (widget);
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GtkArrowPrivate *priv = arrow->priv;
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GtkStyleContext *context;
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gdouble x, y;
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gint width, height;
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gint extent;
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GtkBorder border;
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gfloat xalign, yalign;
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GtkArrowType effective_arrow_type;
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gfloat arrow_scaling;
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gdouble angle;
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if (priv->arrow_type == GTK_ARROW_NONE)
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return FALSE;
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context = gtk_widget_get_style_context (widget);
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gtk_widget_style_get (widget, "arrow-scaling", &arrow_scaling, NULL);
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_gtk_misc_get_padding_and_border (GTK_MISC (widget), &border);
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gtk_misc_get_alignment (GTK_MISC (widget), &xalign, &yalign);
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width = gtk_widget_get_allocated_width (widget) - border.left - border.right;
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height = gtk_widget_get_allocated_height (widget) - border.top - border.bottom;
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extent = MIN (width, height) * arrow_scaling;
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effective_arrow_type = priv->arrow_type;
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if (gtk_widget_get_direction (widget) != GTK_TEXT_DIR_LTR)
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{
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xalign = 1.0 - xalign;
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if (priv->arrow_type == GTK_ARROW_LEFT)
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effective_arrow_type = GTK_ARROW_RIGHT;
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else if (priv->arrow_type == GTK_ARROW_RIGHT)
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effective_arrow_type = GTK_ARROW_LEFT;
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}
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x = border.left + ((width - extent) * xalign);
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y = border.top + ((height - extent) * yalign);
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switch (effective_arrow_type)
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{
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case GTK_ARROW_UP:
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angle = 0;
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break;
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case GTK_ARROW_RIGHT:
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angle = G_PI / 2;
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break;
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case GTK_ARROW_DOWN:
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angle = G_PI;
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break;
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case GTK_ARROW_LEFT:
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default:
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angle = (3 * G_PI) / 2;
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break;
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}
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gtk_render_arrow (context, cr, angle, x, y, extent);
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return FALSE;
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}
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