// Copyright Michael Martin, 2004.

/*
 *  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 LIBS_GRAPHICS_WIDGETS_H_
#define LIBS_GRAPHICS_WIDGETS_H_

#include "libs/gfxlib.h"

enum {
	WIDGET_EVENT_UP,
	WIDGET_EVENT_DOWN,
	WIDGET_EVENT_LEFT,
	WIDGET_EVENT_RIGHT,
	WIDGET_EVENT_SELECT,
	WIDGET_EVENT_CANCEL,
	WIDGET_EVENT_DELETE,
	NUM_WIDGET_EVENTS
};

typedef enum {
	WIDGET_TYPE_MENU_SCREEN,
	WIDGET_TYPE_CHOICE,
	WIDGET_TYPE_BUTTON,
	WIDGET_TYPE_LABEL,
	WIDGET_TYPE_SLIDER,
	WIDGET_TYPE_TEXTENTRY,
	WIDGET_TYPE_CONTROLENTRY,
	NUM_WIDGET_TYPES
} WIDGET_TYPE;

#define WIDGET_TEXTENTRY_WIDTH    50
#define WIDGET_CONTROLENTRY_WIDTH 16

typedef struct _widget {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
} WIDGET;

typedef struct _widget_menu_screen {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	const char *title;
	const char *subtitle;
	STAMP bgStamp;
	int num_children;
	struct _widget **child;
	int highlighted;
} WIDGET_MENU_SCREEN;

typedef struct {
	const char *optname;
	const char *tooltip[3];
} CHOICE_OPTION;

typedef struct _widget_choice {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	const char *category;
	int numopts;
	int maxcolumns;
	CHOICE_OPTION *options;
	int selected, highlighted;
	void (*onChange)(struct _widget_choice *self, int oldval);
} WIDGET_CHOICE;

typedef struct _widget_button {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	const char *name;
	const char *tooltip[3];
} WIDGET_BUTTON;

typedef struct _widget_label {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	int line_count;
	const char **lines;
} WIDGET_LABEL;

typedef struct _widget_slider {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	void (*draw_value)(struct _widget_slider *self, int x, int y);
	int min, max, step;
	int value;
	const char *category;
	const char *tooltip[3];
} WIDGET_SLIDER;

typedef enum {
	WTE_NORMAL = 0,
	WTE_EDITING,
	WTE_BLOCKCUR,

} WIDGET_TEXTENTRY_STATE;

typedef struct _widget_textentry {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	int (*handleEventSelect)(struct _widget_textentry *self);
			// handleEventSelect is an overridable callback event
			// called by the default handleEvent implementation
			// can be NULL, in which case SELECT is ignored
	void (*onChange)(struct _widget_textentry *self);
	const char *category;
	char value[WIDGET_TEXTENTRY_WIDTH];
	int maxlen;
	WIDGET_TEXTENTRY_STATE state;
	int cursor_pos;
} WIDGET_TEXTENTRY;

typedef struct _widget_controlentry {
	WIDGET_TYPE tag;
	struct _widget *parent;
	int (*handleEvent)(struct _widget *self, int event);
	int (*receiveFocus)(struct _widget *self, int event);
	void (*draw)(struct _widget *self, int x, int y);
	int (*height)(struct _widget *self);
	int (*width)(struct _widget *self);
	void (*onChange)(struct _widget_controlentry *self);
	void (*onDelete)(struct _widget_controlentry *self);
	const char *category;
	int controlindex;
	int highlighted;
	char controlname[2][WIDGET_CONTROLENTRY_WIDTH];
} WIDGET_CONTROLENTRY;

void DrawShadowedBox (RECT *r, Color bg, Color dark, Color medium);
void DrawLabelAsWindow (WIDGET_LABEL *label, RECT *windowRect);
void Widget_SetWindowColors (Color bg, Color dark, Color medium);
FONT Widget_SetFont (FONT newFont);


int Widget_Event (int event);

/* Methods for filling in widgets with */

int Widget_ReceiveFocusMenuScreen (WIDGET *_self, int event);
int Widget_ReceiveFocusChoice (WIDGET *_self, int event);
int Widget_ReceiveFocusSimple (WIDGET *_self, int event);
int Widget_ReceiveFocusSlider (WIDGET *_self, int event);
int Widget_ReceiveFocusControlEntry (WIDGET *_self, int event);
int Widget_ReceiveFocusRefuseFocus (WIDGET *_self, int event);

int Widget_HandleEventMenuScreen (WIDGET *_self, int event);
int Widget_HandleEventChoice (WIDGET *_self, int event);
int Widget_HandleEventSlider (WIDGET *_self, int event);
int Widget_HandleEventTextEntry (WIDGET *_self, int event);
int Widget_HandleEventControlEntry (WIDGET *_self, int event);
int Widget_HandleEventIgnoreAll (WIDGET *_self, int event);

int Widget_HeightChoice (WIDGET *_self);
int Widget_HeightFullScreen (WIDGET *_self);
int Widget_HeightOneLine (WIDGET *_self);
int Widget_HeightLabel (WIDGET *_self);

int Widget_WidthFullScreen (WIDGET *_self);

void Widget_DrawMenuScreen (WIDGET *_self, int x, int y);
void Widget_DrawChoice (WIDGET *_self, int x, int y);
void Widget_DrawButton (WIDGET *_self, int x, int y);
void Widget_DrawLabel (WIDGET *_self, int x, int y);
void Widget_DrawSlider (WIDGET *_self, int x, int y);
void Widget_DrawTextEntry (WIDGET *_self, int x, int y);
void Widget_DrawControlEntry (WIDGET *_self, int x, int y);

void Widget_Slider_DrawValue (WIDGET_SLIDER *self, int x, int y);

/* Other implementations will need these values */
extern WIDGET *widget_focus;

#endif /* LIBS_GRAPHICS_WIDGETS_H_ */