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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-
eel-background.h: Object for the background of a widget.
Copyright (C) 2000 Eazel, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA 02110-1301, USA.
Authors: Darin Adler <darin@eazel.com>
*/
#ifndef EEL_BACKGROUND_H
#define EEL_BACKGROUND_H
/* Windows for Eel can contain backgrounds that are either tiled
with an image, a solid color, or a color gradient. This class manages
the process of loading the image if necessary and parsing the string
that specifies either a color or color gradient.
The color or gradient is always present, even if there's a tiled image
on top of it. This is used when the tiled image can't be loaded for
some reason (or just has not been loaded yet).
The EelBackground object is easier to modify than a GtkStyle.
You can just call eel_get_window_background and modify the
returned background directly, unlike a style, which must be copied,
modified and then set.
*/
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
typedef struct EelBackground EelBackground;
typedef struct EelBackgroundClass EelBackgroundClass;
#define EEL_TYPE_BACKGROUND eel_background_get_type()
#define EEL_BACKGROUND(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_BACKGROUND, EelBackground))
#define EEL_BACKGROUND_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_BACKGROUND, EelBackgroundClass))
#define EEL_IS_BACKGROUND(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_BACKGROUND))
#define EEL_IS_BACKGROUND_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_BACKGROUND))
#define EEL_BACKGROUND_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_BACKGROUND, EelBackgroundClass))
typedef enum
{
EEL_BACKGROUND_TILED = 0, /* zero makes this the default placement */
EEL_BACKGROUND_CENTERED,
EEL_BACKGROUND_SCALED,
EEL_BACKGROUND_SCALED_ASPECT,
EEL_BACKGROUND_ZOOM,
EEL_BACKGROUND_SPANNED
} EelBackgroundImagePlacement;
GType eel_background_get_type (void);
EelBackground * eel_background_new (void);
/* Calls to change a background. */
void eel_background_set_use_base (EelBackground *background,
gboolean use_base);
void eel_background_set_color (EelBackground *background,
const char *color_or_gradient);
void eel_background_set_image_uri (EelBackground *background,
const char *image_uri);
void eel_background_reset (EelBackground *background);
void eel_background_set_image_placement (EelBackground *background,
EelBackgroundImagePlacement placement);
/* Should be TRUE for desktop background */
void eel_background_set_desktop (EelBackground *background,
GtkWidget *widget,
gboolean is_desktop);
gboolean eel_background_is_desktop (EelBackground *background);
/* Calls to interrogate the current state of a background. */
char * eel_background_get_color (EelBackground *background);
char * eel_background_get_image_uri (EelBackground *background);
EelBackgroundImagePlacement eel_background_get_image_placement (EelBackground *background);
gboolean eel_background_is_dark (EelBackground *background);
gboolean eel_background_is_set (EelBackground *background);
/* Helper function for widgets using EelBackground */
void eel_background_expose (GtkWidget *widget,
GdkEventExpose *event);
/* Handles a dragged color being dropped on a widget to change the background color. */
void eel_background_receive_dropped_color (EelBackground *background,
GtkWidget *widget,
GdkDragAction action,
int drop_location_x,
int drop_location_y,
const GtkSelectionData *dropped_color);
/* Handles a special-case image name that means "reset to default background" too. */
void eel_background_receive_dropped_background_image (EelBackground *background,
GdkDragAction action,
const char *image_uri);
/* Gets or creates a background so that it's attached to a widget. */
EelBackground * eel_get_widget_background (GtkWidget *widget);
void eel_background_save_to_mateconf (EelBackground *background);
/* Set activity status of background. Inactive backgrounds are drawn in the theme's INSENSITIVE color. */
void eel_background_set_active (EelBackground *background,
gboolean is_active);
typedef struct EelBackgroundDetails EelBackgroundDetails;
struct EelBackground
{
GtkObject object;
EelBackgroundDetails *details;
};
struct EelBackgroundClass
{
GtkObjectClass parent_class;
/* This signal is emitted whenever the background settings are
* changed.
*/
void (* settings_changed) (EelBackground *);
/* This signal is emitted whenever the appearance of the
* background has changed, like when the background settings are
* altered or when an image is loaded.
*/
void (* appearance_changed) (EelBackground *);
/* This signal is emitted when image loading is over - whether it
* was successfully loaded or not.
*/
void (* image_loading_done) (EelBackground *background, gboolean successful_load);
/* This signal is emitted when the background is reset by receiving
the reset property from a drag
*/
void (* reset) (EelBackground *);
};
#endif /* EEL_BACKGROUND_H */
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