/*
 *   GRacer
 *
 *   Copyright (C) 1999 Takashi Matsuda <matsu@users.sourceforge.net>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#ifndef __GRACER_WIDGETS_H__
#define __GRACER_WIDGETS_H__

#include <GL/gl.h>
#include <common/gr_memory.h>

#ifdef __cplusplus
extern "C" {
#endif
#if 0
}
#endif

enum {
  GR_GLUT_ROOT			= 0,
  GR_GLUT_ROOT_WIDGET,
  GR_GLUT_ROOT_GAME,

  GR_GLUT_WIDGET		= 0,
  GR_GLUT_WIDGET_LABEL,
  GR_GLUT_WIDGET_BUTTON,
  GR_GLUT_WIDGET_ENTRY,
};

enum {
  GR_STATE_NORMAL	= 0,
  GR_STATE_ACTIVE,
  GR_STATE_FOCUS,
  GR_STATE_GRAB,
  GR_STATE_DISABLE,

  GR_NUM_STATE,
};

enum {
  GR_CENTER		= 0,
  GR_TOP		= 1<<0,
  GR_BOTTOM		= 1<<1,
  GR_LEFT		= 1<<2,
  GR_RIGHT		= 1<<3,

  GR_VERTICAL_MASK	= (GR_TOP|GR_BOTTOM),
  GR_HORIZONTAL_MASK	= (GR_LEFT|GR_RIGHT),
};

typedef void* GlutObject;

typedef struct GlutRoot			GlutRoot;
typedef struct GlutWidget		GlutWidget;
typedef struct GlutLabel		GlutLabel;
typedef struct GlutButton		GlutButton;
typedef struct GlutEntry		GlutEntry;

typedef struct GlutFontInfo		GlutFontInfo;

struct GlutFontInfo {
  void *font;
  int height;
  int ascent;
  int descent;
  GLuint dl;
  int compiled[128];
};

typedef void (*GlutRootFreeFunc)	(GlutObject obj);
typedef void (*GlutRootDisplayFunc)	(GlutObject obj);
typedef void (*GlutRootReshapeFunc)	(GlutObject obj,
					 int width, int height);

struct GlutRoot {
  GrRef ref;
  int type;

  GLuint dl;
  int changed;

  GlutRootFreeFunc		free_func;
  GlutRootDisplayFunc		display_func;
  GlutRootReshapeFunc		reshape_func;
};

typedef void (*GlutWidgetKeyboardFunc)	(GlutObject obj,
					 unsigned char key, int x, int y);
typedef void (*GlutWidgetSpecialFunc)	(GlutObject obj,
					 int key, int x, int y);
typedef void (*GlutWidgetMouseFunc)	(GlutObject obj,
    					 int button, int state, int x, int y);

/* this is for internal use */
typedef void (*GlutWidgetCheckSize)	(GlutObject obj);

struct GlutWidget {
  GlutRoot core;

  int type;
  int x, y;
  int width, height;
  int anchor;

  int x0, y0, x1, y1;

  int focus;
  int active;

  void *font;
  GLfloat fg_color[GR_NUM_STATE][4];
  GLfloat bg_color[GR_NUM_STATE][4];

  GlutWidgetKeyboardFunc	keyboard_func;
  GlutWidgetSpecialFunc		special_func;
  GlutWidgetMouseFunc		mouse_func;

  GlutWidgetCheckSize		check_size;
};

typedef void (*GlutButtonInvokeFunc)	(GlutObject obj);

struct GlutLabel {
  GlutWidget core;

  int type;

  char *title;
  int length;
  int str_width;
  int justify;
};

struct GlutButton {
  GlutWidget core;

  int type;
  char *title;
  int length;
  int str_width;

  GlutButtonInvokeFunc	invoke_func;
};

typedef void (*GlutEntryInvokeFunc)	(GlutObject obj);
typedef void (*GlutEntryChangedFunc)	(GlutObject obj);

struct GlutEntry {
  GlutWidget core;

  int type;
  char text[1024];
  int length;
  int display_pos;
  int calet_pos;

  GlutEntryChangedFunc	invoke_func;
  GlutEntryChangedFunc	changed_func;
};


extern GrSList *glut_widgets;
extern GlutObject grab_widget;
extern GlutObject focus_widget;

extern int screen_width;
extern int screen_height;

GlutObject	glut_root_new			(void);
void		glut_root_init 			(GlutObject obj);
void		glut_root_destroy		(GlutObject obj);

GlutObject	glut_widget_new			(void);
void		glut_widget_init 		(GlutObject obj);
void		glut_widget_destroy 		(GlutObject obj);

void		glut_widget_set_position	(GlutObject obj,
    						 int x, int y, int anchor);
void		glut_widget_move		(GlutObject obj,
						 int dx, int dy);
void		glut_widget_set_size		(GlutObject obj,
    						 int width, int height);
void		glut_widget_set_font		(GlutObject obj, void *font);
void		glut_widget_set_focus		(GlutObject obj);
int		glut_widget_is_focusable	(GlutObject obj);

GlutObject	glut_label_new	 		(void);
void		glut_label_init	 		(GlutObject obj);
void		glut_label_destroy 		(GlutObject obj);

void		glut_label_set_text		(GlutObject obj, char *text);

void		glut_button_init 		(GlutObject obj);
void		glut_button_destroy 		(GlutObject obj);
GlutObject	glut_button_new 		(void);
void		glut_button_set_text		(GlutObject obj, char *text);
void		glut_button_invoke		(GlutObject obj);

void		glut_entry_init 		(GlutObject obj);
void		glut_entry_destroy 		(GlutObject obj);
GlutObject	glut_entry_new	 		(void);
void		glut_entry_set_text		(GlutObject obj, char *text);
void		glut_entry_invoke		(GlutObject obj);

void		glut_display_func		(void);
void		glut_reshape_func		(int width, int height);
void		glut_keyboard_func		(unsigned char key,
    						 int x, int y);
void		glut_special_func		(int key, int x, int y);
void		glut_mouse_func			(int button, int state,
    						 int x, int y);
void		glut_passive_motion_func	(int x, int y);

void		glut_append_object		(GlutObject obj);
void		glut_prepend_object		(GlutObject obj);
void		glut_insert_object		(GlutObject obj,
    						 GlutObject after);
void		glut_remove_object		(GlutObject obj);

GlutObject	glut_previous_object		(GlutObject);
GlutObject	glut_next_object		(GlutObject);
GlutObject	glut_last_object		(void);

GlutObject	glut_previous_focus_widget	(GlutObject);
GlutObject	glut_next_focus_widget		(GlutObject);

int		glut_bitmap_string_width	(void *font, char *string,
    						 int length);
GlutFontInfo*	glut_get_bitmap_font_info	(void *font);

void		glut_forget_all			(void);


#ifdef __cplusplus
}
#endif

#endif /* __GRACER_WIDGETS_H__ */