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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2001. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
/**
* SECTION:gtkarrow
* @Short_description: Displays an arrow
* @Title: GtkArrow
* @See_also: gtk_render_arrow()
*
* GtkArrow should be used to draw simple arrows that need to point in
* one of the four cardinal directions (up, down, left, or right). The
* style of the arrow can be one of shadow in, shadow out, etched in, or
* etched out. Note that these directions and style types may be
* ammended in versions of GTK+ to come.
*
* GtkArrow will fill any space alloted to it, but since it is inherited
* from #GtkMisc, it can be padded and/or aligned, to fill exactly the
* space the programmer desires.
*
* Arrows are created with a call to gtk_arrow_new(). The direction or
* style of an arrow can be changed after creation by using gtk_arrow_set().
*/
#include "config.h"
#include <math.h>
#include "gtkarrow.h"
#include "gtksizerequest.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "a11y/gtkarrowaccessible.h"
#define MIN_ARROW_SIZE 15
struct _GtkArrowPrivate
{
gint16 arrow_type;
gint16 shadow_type;
};
enum {
PROP_0,
PROP_ARROW_TYPE,
PROP_SHADOW_TYPE
};
static void gtk_arrow_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_arrow_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static gboolean gtk_arrow_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_arrow_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_arrow_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
G_DEFINE_TYPE (GtkArrow, gtk_arrow, GTK_TYPE_MISC)
static void
gtk_arrow_class_init (GtkArrowClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = (GObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
gobject_class->set_property = gtk_arrow_set_property;
gobject_class->get_property = gtk_arrow_get_property;
widget_class->draw = gtk_arrow_draw;
widget_class->get_preferred_width = gtk_arrow_get_preferred_width;
widget_class->get_preferred_height = gtk_arrow_get_preferred_height;
g_object_class_install_property (gobject_class,
PROP_ARROW_TYPE,
g_param_spec_enum ("arrow-type",
P_("Arrow direction"),
P_("The direction the arrow should point"),
GTK_TYPE_ARROW_TYPE,
GTK_ARROW_RIGHT,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_SHADOW_TYPE,
g_param_spec_enum ("shadow-type",
P_("Arrow shadow"),
P_("Appearance of the shadow surrounding the arrow"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_OUT,
GTK_PARAM_READWRITE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_float ("arrow-scaling",
P_("Arrow Scaling"),
P_("Amount of space used up by arrow"),
0.0, 1.0, 0.7,
GTK_PARAM_READABLE));
g_type_class_add_private (class, sizeof (GtkArrowPrivate));
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_ARROW_ACCESSIBLE);
}
static void
gtk_arrow_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkArrow *arrow = GTK_ARROW (object);
GtkArrowPrivate *priv = arrow->priv;
switch (prop_id)
{
case PROP_ARROW_TYPE:
gtk_arrow_set (arrow,
g_value_get_enum (value),
priv->shadow_type);
break;
case PROP_SHADOW_TYPE:
gtk_arrow_set (arrow,
priv->arrow_type,
g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_arrow_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkArrow *arrow = GTK_ARROW (object);
GtkArrowPrivate *priv = arrow->priv;
switch (prop_id)
{
case PROP_ARROW_TYPE:
g_value_set_enum (value, priv->arrow_type);
break;
case PROP_SHADOW_TYPE:
g_value_set_enum (value, priv->shadow_type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_arrow_init (GtkArrow *arrow)
{
GtkArrowPrivate *priv;
arrow->priv = G_TYPE_INSTANCE_GET_PRIVATE (arrow,
GTK_TYPE_ARROW,
GtkArrowPrivate);
priv = arrow->priv;
gtk_widget_set_has_window (GTK_WIDGET (arrow), FALSE);
priv->arrow_type = GTK_ARROW_RIGHT;
priv->shadow_type = GTK_SHADOW_OUT;
}
static void
gtk_arrow_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gint xpad;
gtk_misc_get_padding (GTK_MISC (widget), &xpad, NULL);
if (minimum_size)
*minimum_size = MIN_ARROW_SIZE + xpad * 2;
if (natural_size)
*natural_size = MIN_ARROW_SIZE + xpad * 2;
}
static void
gtk_arrow_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gint ypad;
gtk_misc_get_padding (GTK_MISC (widget), NULL, &ypad);
if (minimum_size)
*minimum_size = MIN_ARROW_SIZE + ypad * 2;
if (natural_size)
*natural_size = MIN_ARROW_SIZE + ypad * 2;
}
/**
* gtk_arrow_new:
* @arrow_type: a valid #GtkArrowType.
* @shadow_type: a valid #GtkShadowType.
*
* Creates a new #GtkArrow widget.
*
* Returns: the new #GtkArrow widget.
*/
GtkWidget*
gtk_arrow_new (GtkArrowType arrow_type,
GtkShadowType shadow_type)
{
GtkArrowPrivate *priv;
GtkArrow *arrow;
arrow = g_object_new (GTK_TYPE_ARROW, NULL);
priv = arrow->priv;
priv->arrow_type = arrow_type;
priv->shadow_type = shadow_type;
return GTK_WIDGET (arrow);
}
/**
* gtk_arrow_set:
* @arrow: a widget of type #GtkArrow.
* @arrow_type: a valid #GtkArrowType.
* @shadow_type: a valid #GtkShadowType.
*
* Sets the direction and style of the #GtkArrow, @arrow.
*/
void
gtk_arrow_set (GtkArrow *arrow,
GtkArrowType arrow_type,
GtkShadowType shadow_type)
{
GtkArrowPrivate *priv;
GtkWidget *widget;
g_return_if_fail (GTK_IS_ARROW (arrow));
priv = arrow->priv;
if (priv->arrow_type != arrow_type
|| priv->shadow_type != shadow_type)
{
g_object_freeze_notify (G_OBJECT (arrow));
if ((GtkArrowType) priv->arrow_type != arrow_type)
{
priv->arrow_type = arrow_type;
g_object_notify (G_OBJECT (arrow), "arrow-type");
}
if (priv->shadow_type != shadow_type)
{
priv->shadow_type = shadow_type;
g_object_notify (G_OBJECT (arrow), "shadow-type");
}
g_object_thaw_notify (G_OBJECT (arrow));
widget = GTK_WIDGET (arrow);
if (gtk_widget_is_drawable (widget))
gtk_widget_queue_draw (widget);
}
}
static gboolean
gtk_arrow_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkArrow *arrow = GTK_ARROW (widget);
GtkArrowPrivate *priv = arrow->priv;
GtkMisc *misc = GTK_MISC (widget);
GtkStyleContext *context;
GtkStateFlags state;
gdouble x, y;
gint width, height;
gint extent;
gint xpad, ypad;
gfloat xalign, yalign;
GtkArrowType effective_arrow_type;
gfloat arrow_scaling;
gdouble angle;
if (priv->arrow_type == GTK_ARROW_NONE)
return FALSE;
context = gtk_widget_get_style_context (widget);
gtk_widget_style_get (widget, "arrow-scaling", &arrow_scaling, NULL);
gtk_misc_get_padding (misc, &xpad, &ypad);
gtk_misc_get_alignment (misc, &xalign, &yalign);
width = gtk_widget_get_allocated_width (widget) - 2 * xpad;
height = gtk_widget_get_allocated_height (widget) - 2 * ypad;
extent = MIN (width, height) * arrow_scaling;
effective_arrow_type = priv->arrow_type;
if (gtk_widget_get_direction (widget) != GTK_TEXT_DIR_LTR)
{
xalign = 1.0 - xalign;
if (priv->arrow_type == GTK_ARROW_LEFT)
effective_arrow_type = GTK_ARROW_RIGHT;
else if (priv->arrow_type == GTK_ARROW_RIGHT)
effective_arrow_type = GTK_ARROW_LEFT;
}
x = xpad + ((width - extent) * xalign);
y = ypad + ((height - extent) * yalign);
switch (effective_arrow_type)
{
case GTK_ARROW_UP:
angle = 0;
break;
case GTK_ARROW_RIGHT:
angle = G_PI / 2;
break;
case GTK_ARROW_DOWN:
angle = G_PI;
break;
case GTK_ARROW_LEFT:
default:
angle = (3 * G_PI) / 2;
break;
}
gtk_style_context_save (context);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_set_state (context, state);
gtk_render_arrow (context, cr, angle, x, y, extent);
gtk_style_context_restore (context);
return FALSE;
}
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