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/*****************************************************************************
*
* Most of this code comes from gAlan 0.2.0, copyright (C) 1999
* Tony Garnock-Jones, with modifications by Sean Bolton,
* copyright (C) 2004, and minor modifications by William Weston,
* copyright (C) 2007, Tomasz Moń, copyright (C) 2009-2011
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA.
*****************************************************************************/
#ifndef __GTK_KNOB_H__
#define __GTK_KNOB_H__
#include <gtk/gtk.h>
#ifdef __cplusplus
extern "C" {
#endif
#define GTK_KNOB(obj) G_TYPE_CHECK_INSTANCE_CAST(obj, gtk_knob_get_type(), GtkKnob)
#define GTK_KNOB_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, gtk_knob_get_type(), GtkKnobClass)
#define GTK_IS_KNOB(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, gtk_knob_get_type())
typedef struct _GtkKnob GtkKnob;
typedef struct _GtkKnobClass GtkKnobClass;
typedef struct _GtkKnobAnim GtkKnobAnim;
typedef enum
{
GTK_KNOB_UPDATE_CONTINUOUS,
GTK_KNOB_UPDATE_DISCONTINUOUS,
GTK_KNOB_UPDATE_DELAYED
} GtkKnobUpdateType;
/* better to make this an object and let widgets ref/deref it perhaps */
struct _GtkKnobAnim {
cairo_surface_t *image;
gint width; /* derived from image width */
gint height; /* derived from image height. */
gint frame_width; /* derived from pixbuf (width / height) or provided override for rectangular frames */
};
struct _GtkKnob {
GtkWidget widget;
GdkWindow *event_window;
/* update policy (GTK_UPDATE_[CONTINUOUS/DELAYED/DISCONTINUOUS]) */
guint policy : 2;
/* State of widget (to do with user interaction) */
guint8 state;
gint saved_x, saved_y;
/* ID of update timer, or 0 if none */
guint32 timer;
/* knob animation */
GtkKnobAnim *anim;
gint width, height;
/* Old values from adjustment stored so we know when something changes */
gdouble old_value;
gdouble old_lower;
gdouble old_upper;
/* The adjustment object that stores the data for this knob */
GtkAdjustment *adjustment;
};
struct _GtkKnobClass {
GtkWidgetClass parent_class;
};
extern GtkWidget *gtk_knob_new(GtkAdjustment *adjustment, GtkKnobAnim *anim);
extern GType gtk_knob_get_type(void);
extern GtkAdjustment *gtk_knob_get_adjustment(GtkKnob *knob);
extern void gtk_knob_set_update_policy(GtkKnob *knob, GtkKnobUpdateType policy);
extern void gtk_knob_set_adjustment(GtkKnob *knob, GtkAdjustment *adjustment);
GtkKnobAnim *gtk_knob_animation_new_from_inline();
void gtk_knob_set_animation (GtkKnob *knob, GtkKnobAnim *anim);
void gtk_knob_animation_free(GtkKnobAnim *anim);
#ifdef __cplusplus
}
#endif
#endif
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