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Massive Quartz input enhancements from Darrell Walisser. His email: Enclosed is a patch that addresses the following: --Various minor cleanups. Removed dead/obsolete code, made some style cleanups --Mouse Events Now keep track of what button(s) were pressed so we know when to send the mouse up event. This fixes the case where the mouse is dragged outside of the game window and released (in which case we want to send the mouse up event even though the mouse is outside the game window). --Input Grabbing Here is my take on the grabbing situation, which is the basis for the new implementation. There are 3 grab states, ungrabbed (UG), visible (VG), and invisible (IG). Both VG and IG keep the mouse constrained to the window and produce relative motion events. In VG the cursor is visible (duh), in IG it is not. In VG, absolute motion events also work. There are 6 actions that can affect grabbing: 1. Set Fullscreen/Window (F/W). In fullscreen, a visible grab should do nothing. However, a fullscreen visible grab can be treated just like a windowed visible grab, which is what I have done to help simplify things. 2. Cursor hide/show (H/S). If the cursor is hidden when grabbing, the grab is an invisible grab. If the cursor is visible, the grab should just constrain the mouse to the window. 3. Input grab/ungrab(G/U). If grabbed, the cursor should be confined to the window as should the keyboard input. On Mac OS X, the keyboard input is implicitly grabbed by confining the cursor, except for command-tab which can switch away from the application. Should the window come to the foreground if the application is deactivated and grab input is called? This isn't necessary in this implementation because the grab state will be asserted upon activation. Using my notation, these are all the cases that need to be handled (state + action = new state). UG+U = UG UG+G = VG or IG, if cursor is visible or not UG+H = UG UG+S = UG VG+U = UG VG+G = VG VG+H = IG VG+S = VG IG+U = UG IG+G = IG IG+H = IG IG+S = VG The cases that result in the same state can be ignored in the code, which cuts it down to just 5 cases. Another issue is what happens when the app loses/gains input focus from deactivate/activate or iconify/deiconify. I think that if input focus is ever lost (outside of SDL's control), the grab state should be suspended and the cursor should become visible and active again. When regained, the cursor should reappear in its original location and/or grab state. This way, when reactivating the cursor is still in the same position as before so apps shouldn't get confused when the next motion event comes in. This is what I've done in this patch.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 27 Dec 2002 20:52:41 +0000
parents f6ffac90895c
children b8d311d90021
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    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
    slouken@libsdl.org
*/

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

/* General keyboard handling code for SDL */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_events.h"
#include "SDL_timer.h"
#include "SDL_events_c.h"
#include "SDL_sysevents.h"


/* Global keystate information */
static Uint8  SDL_KeyState[SDLK_LAST];
static SDLMod SDL_ModState;
int SDL_TranslateUNICODE = 0;

static char *keynames[SDLK_LAST];	/* Array of keycode names */

/*
 * jk 991215 - added
 */
struct {
	int firsttime;    /* if we check against the delay or repeat value */
	int delay;        /* the delay before we start repeating */
	int interval;     /* the delay between key repeat events */
	Uint32 timestamp; /* the time the first keydown event occurred */

	SDL_Event evt;    /* the event we are supposed to repeat */
} SDL_KeyRepeat;

/* Public functions */
int SDL_KeyboardInit(void)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;
	Uint16 i;

	/* Set default mode of UNICODE translation */
	SDL_EnableUNICODE(DEFAULT_UNICODE_TRANSLATION);

	/* Initialize the tables */
	SDL_ModState = KMOD_NONE;
	for ( i=0; i<SDL_TABLESIZE(keynames); ++i )
		keynames[i] = NULL;
	for ( i=0; i<SDL_TABLESIZE(SDL_KeyState); ++i )
		SDL_KeyState[i] = SDL_RELEASED;
	video->InitOSKeymap(this);

	SDL_EnableKeyRepeat(0, 0);

	/* Fill in the blanks in keynames */
	keynames[SDLK_BACKSPACE] = "backspace";
	keynames[SDLK_TAB] = "tab";
	keynames[SDLK_CLEAR] = "clear";
	keynames[SDLK_RETURN] = "return";
	keynames[SDLK_PAUSE] = "pause";
	keynames[SDLK_ESCAPE] = "escape";
	keynames[SDLK_SPACE] = "space";
	keynames[SDLK_EXCLAIM]  = "!";
	keynames[SDLK_QUOTEDBL]  = "\"";
	keynames[SDLK_HASH]  = "#";
	keynames[SDLK_DOLLAR]  = "$";
	keynames[SDLK_AMPERSAND]  = "&";
	keynames[SDLK_QUOTE] = "'";
	keynames[SDLK_LEFTPAREN] = "(";
	keynames[SDLK_RIGHTPAREN] = ")";
	keynames[SDLK_ASTERISK] = "*";
	keynames[SDLK_PLUS] = "+";
	keynames[SDLK_COMMA] = ",";
	keynames[SDLK_MINUS] = "-";
	keynames[SDLK_PERIOD] = ".";
	keynames[SDLK_SLASH] = "/";
	keynames[SDLK_0] = "0";
	keynames[SDLK_1] = "1";
	keynames[SDLK_2] = "2";
	keynames[SDLK_3] = "3";
	keynames[SDLK_4] = "4";
	keynames[SDLK_5] = "5";
	keynames[SDLK_6] = "6";
	keynames[SDLK_7] = "7";
	keynames[SDLK_8] = "8";
	keynames[SDLK_9] = "9";
	keynames[SDLK_COLON] = ":";
	keynames[SDLK_SEMICOLON] = ";";
	keynames[SDLK_LESS] = "<";
	keynames[SDLK_EQUALS] = "=";
	keynames[SDLK_GREATER] = ">";
	keynames[SDLK_QUESTION] = "?";
	keynames[SDLK_AT] = "@";
	keynames[SDLK_LEFTBRACKET] = "[";
	keynames[SDLK_BACKSLASH] = "\\";
	keynames[SDLK_RIGHTBRACKET] = "]";
	keynames[SDLK_CARET] = "^";
	keynames[SDLK_UNDERSCORE] = "_";
	keynames[SDLK_BACKQUOTE] = "`";
	keynames[SDLK_a] = "a";
	keynames[SDLK_b] = "b";
	keynames[SDLK_c] = "c";
	keynames[SDLK_d] = "d";
	keynames[SDLK_e] = "e";
	keynames[SDLK_f] = "f";
	keynames[SDLK_g] = "g";
	keynames[SDLK_h] = "h";
	keynames[SDLK_i] = "i";
	keynames[SDLK_j] = "j";
	keynames[SDLK_k] = "k";
	keynames[SDLK_l] = "l";
	keynames[SDLK_m] = "m";
	keynames[SDLK_n] = "n";
	keynames[SDLK_o] = "o";
	keynames[SDLK_p] = "p";
	keynames[SDLK_q] = "q";
	keynames[SDLK_r] = "r";
	keynames[SDLK_s] = "s";
	keynames[SDLK_t] = "t";
	keynames[SDLK_u] = "u";
	keynames[SDLK_v] = "v";
	keynames[SDLK_w] = "w";
	keynames[SDLK_x] = "x";
	keynames[SDLK_y] = "y";
	keynames[SDLK_z] = "z";
	keynames[SDLK_DELETE] = "delete";

	keynames[SDLK_WORLD_0] = "world 0";
	keynames[SDLK_WORLD_1] = "world 1";
	keynames[SDLK_WORLD_2] = "world 2";
	keynames[SDLK_WORLD_3] = "world 3";
	keynames[SDLK_WORLD_4] = "world 4";
	keynames[SDLK_WORLD_5] = "world 5";
	keynames[SDLK_WORLD_6] = "world 6";
	keynames[SDLK_WORLD_7] = "world 7";
	keynames[SDLK_WORLD_8] = "world 8";
	keynames[SDLK_WORLD_9] = "world 9";
	keynames[SDLK_WORLD_10] = "world 10";
	keynames[SDLK_WORLD_11] = "world 11";
	keynames[SDLK_WORLD_12] = "world 12";
	keynames[SDLK_WORLD_13] = "world 13";
	keynames[SDLK_WORLD_14] = "world 14";
	keynames[SDLK_WORLD_15] = "world 15";
	keynames[SDLK_WORLD_16] = "world 16";
	keynames[SDLK_WORLD_17] = "world 17";
	keynames[SDLK_WORLD_18] = "world 18";
	keynames[SDLK_WORLD_19] = "world 19";
	keynames[SDLK_WORLD_20] = "world 20";
	keynames[SDLK_WORLD_21] = "world 21";
	keynames[SDLK_WORLD_22] = "world 22";
	keynames[SDLK_WORLD_23] = "world 23";
	keynames[SDLK_WORLD_24] = "world 24";
	keynames[SDLK_WORLD_25] = "world 25";
	keynames[SDLK_WORLD_26] = "world 26";
	keynames[SDLK_WORLD_27] = "world 27";
	keynames[SDLK_WORLD_28] = "world 28";
	keynames[SDLK_WORLD_29] = "world 29";
	keynames[SDLK_WORLD_30] = "world 30";
	keynames[SDLK_WORLD_31] = "world 31";
	keynames[SDLK_WORLD_32] = "world 32";
	keynames[SDLK_WORLD_33] = "world 33";
	keynames[SDLK_WORLD_34] = "world 34";
	keynames[SDLK_WORLD_35] = "world 35";
	keynames[SDLK_WORLD_36] = "world 36";
	keynames[SDLK_WORLD_37] = "world 37";
	keynames[SDLK_WORLD_38] = "world 38";
	keynames[SDLK_WORLD_39] = "world 39";
	keynames[SDLK_WORLD_40] = "world 40";
	keynames[SDLK_WORLD_41] = "world 41";
	keynames[SDLK_WORLD_42] = "world 42";
	keynames[SDLK_WORLD_43] = "world 43";
	keynames[SDLK_WORLD_44] = "world 44";
	keynames[SDLK_WORLD_45] = "world 45";
	keynames[SDLK_WORLD_46] = "world 46";
	keynames[SDLK_WORLD_47] = "world 47";
	keynames[SDLK_WORLD_48] = "world 48";
	keynames[SDLK_WORLD_49] = "world 49";
	keynames[SDLK_WORLD_50] = "world 50";
	keynames[SDLK_WORLD_51] = "world 51";
	keynames[SDLK_WORLD_52] = "world 52";
	keynames[SDLK_WORLD_53] = "world 53";
	keynames[SDLK_WORLD_54] = "world 54";
	keynames[SDLK_WORLD_55] = "world 55";
	keynames[SDLK_WORLD_56] = "world 56";
	keynames[SDLK_WORLD_57] = "world 57";
	keynames[SDLK_WORLD_58] = "world 58";
	keynames[SDLK_WORLD_59] = "world 59";
	keynames[SDLK_WORLD_60] = "world 60";
	keynames[SDLK_WORLD_61] = "world 61";
	keynames[SDLK_WORLD_62] = "world 62";
	keynames[SDLK_WORLD_63] = "world 63";
	keynames[SDLK_WORLD_64] = "world 64";
	keynames[SDLK_WORLD_65] = "world 65";
	keynames[SDLK_WORLD_66] = "world 66";
	keynames[SDLK_WORLD_67] = "world 67";
	keynames[SDLK_WORLD_68] = "world 68";
	keynames[SDLK_WORLD_69] = "world 69";
	keynames[SDLK_WORLD_70] = "world 70";
	keynames[SDLK_WORLD_71] = "world 71";
	keynames[SDLK_WORLD_72] = "world 72";
	keynames[SDLK_WORLD_73] = "world 73";
	keynames[SDLK_WORLD_74] = "world 74";
	keynames[SDLK_WORLD_75] = "world 75";
	keynames[SDLK_WORLD_76] = "world 76";
	keynames[SDLK_WORLD_77] = "world 77";
	keynames[SDLK_WORLD_78] = "world 78";
	keynames[SDLK_WORLD_79] = "world 79";
	keynames[SDLK_WORLD_80] = "world 80";
	keynames[SDLK_WORLD_81] = "world 81";
	keynames[SDLK_WORLD_82] = "world 82";
	keynames[SDLK_WORLD_83] = "world 83";
	keynames[SDLK_WORLD_84] = "world 84";
	keynames[SDLK_WORLD_85] = "world 85";
	keynames[SDLK_WORLD_86] = "world 86";
	keynames[SDLK_WORLD_87] = "world 87";
	keynames[SDLK_WORLD_88] = "world 88";
	keynames[SDLK_WORLD_89] = "world 89";
	keynames[SDLK_WORLD_90] = "world 90";
	keynames[SDLK_WORLD_91] = "world 91";
	keynames[SDLK_WORLD_92] = "world 92";
	keynames[SDLK_WORLD_93] = "world 93";
	keynames[SDLK_WORLD_94] = "world 94";
	keynames[SDLK_WORLD_95] = "world 95";

	keynames[SDLK_KP0] = "[0]";
	keynames[SDLK_KP1] = "[1]";
	keynames[SDLK_KP2] = "[2]";
	keynames[SDLK_KP3] = "[3]";
	keynames[SDLK_KP4] = "[4]";
	keynames[SDLK_KP5] = "[5]";
	keynames[SDLK_KP6] = "[6]";
	keynames[SDLK_KP7] = "[7]";
	keynames[SDLK_KP8] = "[8]";
	keynames[SDLK_KP9] = "[9]";
	keynames[SDLK_KP_PERIOD] = "[.]";
	keynames[SDLK_KP_DIVIDE] = "[/]";
	keynames[SDLK_KP_MULTIPLY] = "[*]";
	keynames[SDLK_KP_MINUS] = "[-]";
	keynames[SDLK_KP_PLUS] = "[+]";
	keynames[SDLK_KP_ENTER] = "enter";
	keynames[SDLK_KP_EQUALS] = "equals";

	keynames[SDLK_UP] = "up";
	keynames[SDLK_DOWN] = "down";
	keynames[SDLK_RIGHT] = "right";
	keynames[SDLK_LEFT] = "left";
	keynames[SDLK_DOWN] = "down";
	keynames[SDLK_INSERT] = "insert";
	keynames[SDLK_HOME] = "home";
	keynames[SDLK_END] = "end";
	keynames[SDLK_PAGEUP] = "page up";
	keynames[SDLK_PAGEDOWN] = "page down";

	keynames[SDLK_F1] = "f1";
	keynames[SDLK_F2] = "f2";
	keynames[SDLK_F3] = "f3";
	keynames[SDLK_F4] = "f4";
	keynames[SDLK_F5] = "f5";
	keynames[SDLK_F6] = "f6";
	keynames[SDLK_F7] = "f7";
	keynames[SDLK_F8] = "f8";
	keynames[SDLK_F9] = "f9";
	keynames[SDLK_F10] = "f10";
	keynames[SDLK_F11] = "f11";
	keynames[SDLK_F12] = "f12";
	keynames[SDLK_F13] = "f13";
	keynames[SDLK_F14] = "f14";
	keynames[SDLK_F15] = "f15";

	keynames[SDLK_NUMLOCK] = "numlock";
	keynames[SDLK_CAPSLOCK] = "caps lock";
	keynames[SDLK_SCROLLOCK] = "scroll lock";
	keynames[SDLK_RSHIFT] = "right shift";
	keynames[SDLK_LSHIFT] = "left shift";
	keynames[SDLK_RCTRL] = "right ctrl";
	keynames[SDLK_LCTRL] = "left ctrl";
	keynames[SDLK_RALT] = "right alt";
	keynames[SDLK_LALT] = "left alt";
	keynames[SDLK_RMETA] = "right meta";
	keynames[SDLK_LMETA] = "left meta";
	keynames[SDLK_LSUPER] = "left super";	/* "Windows" keys */
	keynames[SDLK_RSUPER] = "right super";	
	keynames[SDLK_MODE] = "alt gr";
	keynames[SDLK_COMPOSE] = "compose";

	keynames[SDLK_HELP] = "help";
	keynames[SDLK_PRINT] = "print screen";
	keynames[SDLK_SYSREQ] = "sys req";
	keynames[SDLK_BREAK] = "break";
	keynames[SDLK_MENU] = "menu";
	keynames[SDLK_POWER] = "power";
	keynames[SDLK_EURO] = "euro";
	keynames[SDLK_UNDO] = "undo";

	/* Done.  Whew. */
	return(0);
}

/* We lost the keyboard, so post key up messages for all pressed keys */
void SDL_ResetKeyboard(void)
{
	SDL_keysym keysym;
	SDLKey key;

	memset(&keysym, 0, (sizeof keysym));
	for ( key=SDLK_FIRST; key<SDLK_LAST; ++key ) {
		if ( SDL_KeyState[key] == SDL_PRESSED ) {
			keysym.sym = key;
			SDL_PrivateKeyboard(SDL_RELEASED, &keysym);
		}
	}
	SDL_KeyRepeat.timestamp = 0;
}

int SDL_EnableUNICODE(int enable)
{
	int old_mode;

	old_mode = SDL_TranslateUNICODE;
	if ( enable >= 0 ) {
		SDL_TranslateUNICODE = enable;
	}
	return(old_mode);
}

Uint8 * SDL_GetKeyState (int *numkeys)
{
	if ( numkeys != (int *)0 )
		*numkeys = SDLK_LAST;
	return(SDL_KeyState);
}
SDLMod SDL_GetModState (void)
{
	return(SDL_ModState);
}
void SDL_SetModState (SDLMod modstate)
{
	SDL_ModState = modstate;
}

char *SDL_GetKeyName(SDLKey key)
{
	char *keyname;

	keyname = NULL;
	if ( key < SDLK_LAST ) {
		keyname = keynames[key];
	}
	if ( keyname == NULL ) {
		keyname = "unknown key";
	}
	return(keyname);
}

/* These are global for SDL_eventloop.c */
int SDL_PrivateKeyboard(Uint8 state, SDL_keysym *keysym)
{
	SDL_Event event;
	int posted, repeatable;
	Uint16 modstate;

	memset(&event, 0, sizeof(event));

#if 0
printf("The '%s' key has been %s\n", SDL_GetKeyName(keysym->sym), 
				state == SDL_PRESSED ? "pressed" : "released");
#endif
	/* Set up the keysym */
	modstate = (Uint16)SDL_ModState;

	repeatable = 0;

	if ( state == SDL_PRESSED ) {
		keysym->mod = (SDLMod)modstate;
		switch (keysym->sym) {
			case SDLK_NUMLOCK:
				modstate ^= KMOD_NUM;
				if ( ! (modstate&KMOD_NUM) )
					state = SDL_RELEASED;
				keysym->mod = (SDLMod)modstate;
				break;
			case SDLK_CAPSLOCK:
				modstate ^= KMOD_CAPS;
				if ( ! (modstate&KMOD_CAPS) )
					state = SDL_RELEASED;
				keysym->mod = (SDLMod)modstate;
				break;
			case SDLK_LCTRL:
				modstate |= KMOD_LCTRL;
				break;
			case SDLK_RCTRL:
				modstate |= KMOD_RCTRL;
				break;
			case SDLK_LSHIFT:
				modstate |= KMOD_LSHIFT;
				break;
			case SDLK_RSHIFT:
				modstate |= KMOD_RSHIFT;
				break;
			case SDLK_LALT:
				modstate |= KMOD_LALT;
				break;
			case SDLK_RALT:
				modstate |= KMOD_RALT;
				break;
			case SDLK_LMETA:
				modstate |= KMOD_LMETA;
				break;
			case SDLK_RMETA:
				modstate |= KMOD_RMETA;
				break;
			case SDLK_MODE:
				modstate |= KMOD_MODE;
				break;
			default:
				repeatable = 1;
				break;
		}
	} else {
		switch (keysym->sym) {
			case SDLK_NUMLOCK:
			case SDLK_CAPSLOCK:
				/* Only send keydown events */
				return(0);
			case SDLK_LCTRL:
				modstate &= ~KMOD_LCTRL;
				break;
			case SDLK_RCTRL:
				modstate &= ~KMOD_RCTRL;
				break;
			case SDLK_LSHIFT:
				modstate &= ~KMOD_LSHIFT;
				break;
			case SDLK_RSHIFT:
				modstate &= ~KMOD_RSHIFT;
				break;
			case SDLK_LALT:
				modstate &= ~KMOD_LALT;
				break;
			case SDLK_RALT:
				modstate &= ~KMOD_RALT;
				break;
			case SDLK_LMETA:
				modstate &= ~KMOD_LMETA;
				break;
			case SDLK_RMETA:
				modstate &= ~KMOD_RMETA;
				break;
			case SDLK_MODE:
				modstate &= ~KMOD_MODE;
				break;
			default:
				break;
		}
		keysym->mod = (SDLMod)modstate;
	}

	/* Figure out what type of event this is */
	switch (state) {
		case SDL_PRESSED:
			event.type = SDL_KEYDOWN;
			break;
		case SDL_RELEASED:
			event.type = SDL_KEYUP;
			/*
			 * jk 991215 - Added
			 */
			if ( SDL_KeyRepeat.timestamp ) {
				SDL_KeyRepeat.timestamp = 0;
			}
			break;
		default:
			/* Invalid state -- bail */
			return(0);
	}

	/* Drop events that don't change state */
	if ( SDL_KeyState[keysym->sym] == state ) {
		return(0);
	}

	/* Update internal keyboard state */
	SDL_ModState = (SDLMod)modstate;
	SDL_KeyState[keysym->sym] = state;

	/* Post the event, if desired */
	posted = 0;
	if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
		event.key.state = state;
		event.key.keysym = *keysym;
		/*
		 * jk 991215 - Added
		 */
		if (repeatable && (SDL_KeyRepeat.delay != 0)) {
			SDL_KeyRepeat.evt = event;
			SDL_KeyRepeat.firsttime = 1;
			SDL_KeyRepeat.timestamp=SDL_GetTicks();
		}
		if ( (SDL_EventOK == NULL) || SDL_EventOK(&event) ) {
			posted = 1;
			SDL_PushEvent(&event);
		}
	}
	return(posted);
}

/*
 * jk 991215 - Added
 */
void SDL_CheckKeyRepeat(void)
{
	if ( SDL_KeyRepeat.timestamp ) {
		Uint32 now, interval;

		now = SDL_GetTicks();
		interval = (now - SDL_KeyRepeat.timestamp);
		if ( SDL_KeyRepeat.firsttime ) {
			if ( interval > (Uint32)SDL_KeyRepeat.delay ) {
				SDL_KeyRepeat.timestamp = now;
				SDL_KeyRepeat.firsttime = 0;
			}
		} else {
			if ( interval > (Uint32)SDL_KeyRepeat.interval ) {
				SDL_KeyRepeat.timestamp = now;
				if ( (SDL_EventOK == NULL) || SDL_EventOK(&SDL_KeyRepeat.evt) ) {
					SDL_PushEvent(&SDL_KeyRepeat.evt);
				}
			}
		}
	}
}

int SDL_EnableKeyRepeat(int delay, int interval)
{
	if ( (delay < 0) || (interval < 0) ) {
		SDL_SetError("keyboard repeat value less than zero");
		return(-1);
	}
	SDL_KeyRepeat.firsttime = 0;
	SDL_KeyRepeat.delay = delay;
	SDL_KeyRepeat.interval = interval;
	SDL_KeyRepeat.timestamp = 0;
	return(0);
}