author Sam Lantinga <>
Sun, 18 Jul 2004 22:57:40 +0000
changeset 911 04a403e4ccf5
parent 769 b8d311d90021
child 1312 c9b51268668f
permissions -rw-r--r--
Date: Mon, 3 May 2004 03:15:01 +0100 From: David Symmonds Subject: SDL Typedef Structs Hi, Thanks for the SDL libraries, I have been using them for about a year now and they are really brilliant. One thing that I have just found whilst using them through C++ (and needing forward declarations) is that when you typedef structs you sometimes use typedef struct Name { ... }Name; e.g. SDL_Surface and other times use typedef struct { ... }Name; e.g. SDL_Rect The first type works fine, when I define a header file I can just put 'struct Name;' at the top and use the Name throughout. However, the second type is harder to use in a header, and I haven't found a way yet, other than to include 'SDL.h' in the header file (undesirable). Would there be any harm in changing the definition of SDL_Rect and such like to the second form?

    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library 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 library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

static char rcsid =
 "@(#) $Id$";

/* Include file for SDL keyboard event handling */

#ifndef _SDL_keyboard_h
#define _SDL_keyboard_h

#include "SDL_types.h"
#include "SDL_keysym.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {

/* Keysym structure
   - The scancode is hardware dependent, and should not be used by general
     applications.  If no hardware scancode is available, it will be 0.

   - The 'unicode' translated character is only available when character
     translation is enabled by the SDL_EnableUNICODE() API.  If non-zero,
     this is a UNICODE character corresponding to the keypress.  If the
     high 9 bits of the character are 0, then this maps to the equivalent
     ASCII character:
	char ch;
	if ( (keysym.unicode & 0xFF80) == 0 ) {
		ch = keysym.unicode & 0x7F;
	} else {
		An international character..
typedef struct SDL_keysym {
	Uint8 scancode;			/* hardware specific scancode */
	SDLKey sym;			/* SDL virtual keysym */
	SDLMod mod;			/* current key modifiers */
	Uint16 unicode;			/* translated character */
} SDL_keysym;

/* This is the mask which refers to all hotkey bindings */

/* Function prototypes */
 * Enable/Disable UNICODE translation of keyboard input.
 * This translation has some overhead, so translation defaults off.
 * If 'enable' is 1, translation is enabled.
 * If 'enable' is 0, translation is disabled.
 * If 'enable' is -1, the translation state is not changed.
 * It returns the previous state of keyboard translation.
extern DECLSPEC int SDLCALL SDL_EnableUNICODE(int enable);

 * Enable/Disable keyboard repeat.  Keyboard repeat defaults to off.
 * 'delay' is the initial delay in ms between the time when a key is
 * pressed, and keyboard repeat begins.
 * 'interval' is the time in ms between keyboard repeat events.
 * If 'delay' is set to 0, keyboard repeat is disabled.
extern DECLSPEC int SDLCALL SDL_EnableKeyRepeat(int delay, int interval);

 * Get a snapshot of the current state of the keyboard.
 * Returns an array of keystates, indexed by the SDLK_* syms.
 * Used:
 * 	Uint8 *keystate = SDL_GetKeyState(NULL);
 *	if ( keystate[SDLK_RETURN] ) ... <RETURN> is pressed.
extern DECLSPEC Uint8 * SDLCALL SDL_GetKeyState(int *numkeys);

 * Get the current key modifier state
extern DECLSPEC SDLMod SDLCALL SDL_GetModState(void);

 * Set the current key modifier state
 * This does not change the keyboard state, only the key modifier flags.
extern DECLSPEC void SDLCALL SDL_SetModState(SDLMod modstate);

 * Get the name of an SDL virtual keysym
extern DECLSPEC char * SDLCALL SDL_GetKeyName(SDLKey key);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
#include "close_code.h"

#endif /* _SDL_keyboard_h */