/* SLV2
 * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
 * Author: Lars Luthman
 *  
 * This library 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 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __SLV2_PLUGINGUIINSTANCE_H__
#define __SLV2_PLUGINGUIINSTANCE_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <assert.h>
#include <slv2/lv2-gtk2gui.h>
#include <slv2/plugin.h>

/** \defgroup lib Plugin GUI library access
 *
 * An SLV2GUIInstance is an instantiated GUI for a SLV2Plugin. GUI instances
 * are loaded from dynamically loaded libraries.  These functions interact 
 * with the GUI code in the binary library only, they do not read data files
 * in any way.
 * 
 * @{
 */


typedef struct _SLV2GUIInstanceImpl* SLV2GUIInstanceImpl;

  
struct _GtkWidget;


/** Instance of a plugin GUI.
 *
 * All details are in hidden in the pimpl member to avoid making the
 * implementation a part of the ABI.
 */
typedef struct _SLV2GUIInstance {
	SLV2GUIInstanceImpl pimpl; ///< Private implementation
}* SLV2GUIInstance;



/** Instantiate a plugin GUI.
 *
 * The returned object represents shared library objects loaded into memory,
 * it must be cleaned up with slv2_gui_instance_free when no longer
 * needed.
 * 
 * \a plugin is not modified or directly referenced by the returned object
 * (instances store only a copy of the plugin's URI).
 * 
 * \a host_features NULL-terminated array of features the host supports.
 * NULL may be passed if the host supports no additional features (unlike
 * the LV2 specification - SLV2 takes care of it).
 *
 * \return NULL if instantiation failed.
 */
SLV2GUIInstance
slv2_plugin_gtk2_gui_instantiate(SLV2Plugin                 plugin,
                                 SLV2Value                  gui,
                                 LV2UI_Set_Control_Function control_function,
                                 LV2UI_Controller           controller,
                                 const LV2_Host_Feature**   host_features);


/** Free a plugin GUI instance.
 *
 * \a instance is invalid after this call.
 */
void
slv2_gtk2_gui_instance_free(SLV2GUIInstance instance);


/** Get the GTK+ 2.0 widget for the GUI instance.
 */
struct _GtkWidget*
slv2_gtk2_gui_instance_get_widget(SLV2GUIInstance instance);


/** Get the LV2UI_Descriptor of the plugin GUI instance.
 *
 * Normally hosts should not need to access the LV2UI_Descriptor directly,
 * use the slv2_gui_instance_* functions.
 *
 * The returned descriptor is shared and must not be deleted.
 */
const LV2UI_Descriptor*
slv2_gtk2_gui_instance_get_descriptor(SLV2GUIInstance instance);


/** Get the LV2UI_Handle of the plugin GUI instance.
 *
 * Normally hosts should not need to access the LV2UI_Handle directly,
 * use the slv2_gui_instance_* functions.
 * 
 * The returned handle is shared and must not be deleted.
 */
LV2_Handle
slv2_gtk2_gui_instance_get_handle(SLV2GUIInstance instance);


/** @} */

#ifdef __cplusplus
}
#endif


#endif /* __SLV2_PLUGINGUIINSTANCE_H__ */