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gimp/libgimpwidgets/gimpruler.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* 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.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpruler.h"
/* All distances below are in 1/72nd's of an inch. (According to
* Adobe that's a point, but points are really 1/72.27 in.)
*/
typedef struct
{
GimpUnit unit;
gdouble lower;
gdouble upper;
gdouble position;
gdouble max_size;
GdkPixmap *backing_store;
GdkGC *non_gr_exp_gc;
} GimpRulerPrivate;
enum
{
PROP_0,
PROP_UNIT,
PROP_LOWER,
PROP_UPPER,
PROP_POSITION,
PROP_MAX_SIZE
};
static void gimp_ruler_realize (GtkWidget *widget);
static void gimp_ruler_unrealize (GtkWidget *widget);
static void gimp_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gint gimp_ruler_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gimp_ruler_draw_ticks (GimpRuler *ruler);
static void gimp_ruler_draw_pos (GimpRuler *ruler);
static void gimp_ruler_make_pixmap (GimpRuler *ruler);
static void gimp_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
G_DEFINE_TYPE (GimpRuler, gimp_ruler, GTK_TYPE_WIDGET)
#define GIMP_RULER_GET_PRIVATE(ruler) \
G_TYPE_INSTANCE_GET_PRIVATE (ruler, GIMP_TYPE_RULER, GimpRulerPrivate)
static void
gimp_ruler_class_init (GimpRulerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->set_property = gimp_ruler_set_property;
object_class->get_property = gimp_ruler_get_property;
widget_class->realize = gimp_ruler_realize;
widget_class->unrealize = gimp_ruler_unrealize;
widget_class->size_allocate = gimp_ruler_size_allocate;
widget_class->expose_event = gimp_ruler_expose;
klass->draw_ticks = NULL;
klass->draw_pos = NULL;
g_type_class_add_private (object_class, sizeof (GimpRulerPrivate));
g_object_class_install_property (object_class,
PROP_LOWER,
gimp_param_spec_unit ("unit",
"Unit",
"Unit of ruler",
TRUE, TRUE,
GIMP_UNIT_PIXEL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_LOWER,
g_param_spec_double ("lower",
"Lower",
"Lower limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_UPPER,
g_param_spec_double ("upper",
"Upper",
"Upper limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_POSITION,
g_param_spec_double ("position",
"Position",
"Position of mark on the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_MAX_SIZE,
g_param_spec_double ("max-size",
"Max Size",
"Maximum size of the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
}
static void
gimp_ruler_init (GimpRuler *ruler)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
priv->unit = GIMP_PIXELS;
priv->lower = 0;
priv->upper = 0;
priv->position = 0;
priv->max_size = 0;
priv->backing_store = NULL;
priv->non_gr_exp_gc = NULL;
}
static void
gimp_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GimpRuler *ruler = GIMP_RULER (object);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_UNIT:
gimp_ruler_set_unit (ruler, g_value_get_int (value));
break;
case PROP_LOWER:
gimp_ruler_set_range (ruler,
g_value_get_double (value),
priv->upper,
priv->max_size);
break;
case PROP_UPPER:
gimp_ruler_set_range (ruler,
priv->lower,
g_value_get_double (value),
priv->max_size);
break;
case PROP_POSITION:
gimp_ruler_set_position (ruler, g_value_get_double (value));
break;
case PROP_MAX_SIZE:
gimp_ruler_set_range (ruler,
priv->lower,
priv->upper,
g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gimp_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GimpRuler *ruler = GIMP_RULER (object);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_UNIT:
g_value_set_int (value, priv->unit);
break;
case PROP_LOWER:
g_value_set_double (value, priv->lower);
break;
case PROP_UPPER:
g_value_set_double (value, priv->upper);
break;
case PROP_POSITION:
g_value_set_double (value, priv->position);
break;
case PROP_MAX_SIZE:
g_value_set_double (value, priv->max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gimp_ruler_set_position:
* @ruler: a #GimpRuler
* @unit: the #GimpUnit to set the ruler to
*
* This sets the unit of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_unit (GimpRuler *ruler,
GimpUnit unit)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->unit != unit)
{
priv->unit = unit;
g_object_notify (G_OBJECT (ruler), "unit");
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
}
/**
* gimp_ruler_get_unit:
* @ruler: a #GimpRuler
*
* Return value: the unit currently used in the @ruler widget.
*
* Since: GIMP 2.8
**/
GimpUnit
gimp_ruler_get_unit (GimpRuler *ruler)
{
g_return_val_if_fail (GIMP_IS_RULER (ruler), 0);
return GIMP_RULER_GET_PRIVATE (ruler)->unit;
}
/**
* gimp_ruler_set_position:
* @ruler: a #GimpRuler
* @position: the position to set the ruler to
*
* This sets the position of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_position (GimpRuler *ruler,
gdouble position)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->position != position)
{
priv->position = position;
g_object_notify (G_OBJECT (ruler), "position");
gimp_ruler_draw_pos (ruler);
}
}
/**
* gimp_ruler_get_position:
* @ruler: a #GimpRuler
*
* Return value: the current position of the @ruler widget.
*
* Since: GIMP 2.8
**/
gdouble
gimp_ruler_get_position (GimpRuler *ruler)
{
g_return_val_if_fail (GIMP_IS_RULER (ruler), 0.0);
return GIMP_RULER_GET_PRIVATE (ruler)->position;
}
/**
* gimp_ruler_set_range:
* @ruler: a #GimpRuler
* @lower: the lower limit of the ruler
* @upper: the upper limit of the ruler
* @max_size: the maximum size of the ruler used when calculating the space to
* leave for the text
*
* This sets the range of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_range (GimpRuler *ruler,
gdouble lower,
gdouble upper,
gdouble max_size)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
g_object_freeze_notify (G_OBJECT (ruler));
if (priv->lower != lower)
{
priv->lower = lower;
g_object_notify (G_OBJECT (ruler), "lower");
}
if (priv->upper != upper)
{
priv->upper = upper;
g_object_notify (G_OBJECT (ruler), "upper");
}
if (priv->max_size != max_size)
{
priv->max_size = max_size;
g_object_notify (G_OBJECT (ruler), "max-size");
}
g_object_thaw_notify (G_OBJECT (ruler));
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
/**
* gimp_ruler_get_range:
* @ruler: a #GimpRuler
* @lower: location to store lower limit of the ruler, or %NULL
* @upper: location to store upper limit of the ruler, or %NULL
* @max_size: location to store the maximum size of the ruler used when
* calculating the space to leave for the text, or %NULL.
*
* Retrieves values indicating the range and current position of a #GimpRuler.
* See gimp_ruler_set_range().
*
* Since: GIMP 2.8
**/
void
gimp_ruler_get_range (GimpRuler *ruler,
gdouble *lower,
gdouble *upper,
gdouble *max_size)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (lower)
*lower = priv->lower;
if (upper)
*upper = priv->upper;
if (max_size)
*max_size = priv->max_size;
}
GdkDrawable *
_gimp_ruler_get_backing_store (GimpRuler *ruler)
{
return GIMP_RULER_GET_PRIVATE (ruler)->backing_store;
}
PangoLayout *
_gimp_ruler_create_pango_layout (GtkWidget *widget,
const gchar *text)
{
PangoLayout *layout;
PangoAttrList *attrs;
PangoAttribute *attr;
layout = gtk_widget_create_pango_layout (widget, text);
attrs = pango_attr_list_new ();
attr = pango_attr_scale_new (PANGO_SCALE_X_SMALL);
attr->start_index = 0;
attr->end_index = -1;
pango_attr_list_insert (attrs, attr);
pango_layout_set_attributes (layout, attrs);
pango_attr_list_unref (attrs);
return layout;
}
static void
gimp_ruler_realize (GtkWidget *widget)
{
GimpRuler *ruler = GIMP_RULER (widget);
GdkWindowAttr attributes;
gint attributes_mask;
GTK_WIDGET_SET_FLAGS (ruler, GTK_REALIZED);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = gtk_widget_get_events (widget);
attributes.event_mask |= (GDK_EXPOSURE_MASK |
GDK_POINTER_MOTION_MASK |
GDK_POINTER_MOTION_HINT_MASK);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (widget->window, ruler);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_ACTIVE);
gimp_ruler_make_pixmap (ruler);
}
static void
gimp_ruler_unrealize (GtkWidget *widget)
{
GimpRuler *ruler = GIMP_RULER (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->backing_store)
{
g_object_unref (priv->backing_store);
priv->backing_store = NULL;
}
if (priv->non_gr_exp_gc)
{
g_object_unref (priv->non_gr_exp_gc);
priv->non_gr_exp_gc = NULL;
}
if (GTK_WIDGET_CLASS (gimp_ruler_parent_class)->unrealize)
(* GTK_WIDGET_CLASS (gimp_ruler_parent_class)->unrealize) (widget);
}
static void
gimp_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpRuler *ruler = GIMP_RULER (widget);
widget->allocation = *allocation;
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gimp_ruler_make_pixmap (ruler);
}
}
static gint
gimp_ruler_expose (GtkWidget *widget,
GdkEventExpose *event)
{
if (GTK_WIDGET_DRAWABLE (widget))
{
GimpRuler *ruler = GIMP_RULER (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
gimp_ruler_draw_ticks (ruler);
gdk_draw_drawable (widget->window,
priv->non_gr_exp_gc,
priv->backing_store,
0, 0, 0, 0,
widget->allocation.width,
widget->allocation.height);
gimp_ruler_draw_pos (ruler);
}
return FALSE;
}
static void
gimp_ruler_draw_ticks (GimpRuler *ruler)
{
g_return_if_fail (GIMP_IS_RULER (ruler));
if (GIMP_RULER_GET_CLASS (ruler)->draw_ticks)
GIMP_RULER_GET_CLASS (ruler)->draw_ticks (ruler);
}
static void
gimp_ruler_draw_pos (GimpRuler *ruler)
{
g_return_if_fail (GIMP_IS_RULER (ruler));
if (GIMP_RULER_GET_CLASS (ruler)->draw_pos)
GIMP_RULER_GET_CLASS (ruler)->draw_pos (ruler);
}
static void
gimp_ruler_make_pixmap (GimpRuler *ruler)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkWidget *widget = GTK_WIDGET (ruler);
gint width;
gint height;
if (priv->backing_store)
{
gdk_drawable_get_size (priv->backing_store, &width, &height);
if ((width == widget->allocation.width) &&
(height == widget->allocation.height))
return;
g_object_unref (priv->backing_store);
}
priv->backing_store = gdk_pixmap_new (widget->window,
widget->allocation.width,
widget->allocation.height,
-1);
if (!priv->non_gr_exp_gc)
{
priv->non_gr_exp_gc = gdk_gc_new (widget->window);
gdk_gc_set_exposures (priv->non_gr_exp_gc, FALSE);
}
}
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