/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997, 1998, 1999, 2000, 2001 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

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* General mouse handling code for SDL */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL_events.h"

#include "SDL_events_c.h"

#include "SDL_cursor_c.h"

#include "SDL_sysvideo.h"

/* These are static for our mouse handling code */

static Sint16 SDL_MouseX = 0;

static Sint16 SDL_MouseY = 0;

static Sint16 SDL_DeltaX = 0;

static Sint16 SDL_DeltaY = 0;

static Uint8 SDL_ButtonState = 0;

/* Public functions */

int SDL_MouseInit(void)

{

/* The mouse is at (0,0) */

SDL_MouseX = 0;

SDL_MouseY = 0;

SDL_DeltaX = 0;

SDL_DeltaY = 0;

SDL_ButtonState = 0;

/* That's it! */

return(0);

}

Uint8 SDL_GetMouseState (int *x, int *y)

{

if ( x )

*x = SDL_MouseX;

if ( y )

*y = SDL_MouseY;

return(SDL_ButtonState);

}

Uint8 SDL_GetRelativeMouseState (int *x, int *y)

{

if ( x )

*x = SDL_DeltaX;

if ( y )

*y = SDL_DeltaY;

SDL_DeltaX = 0;

SDL_DeltaY = 0;

return(SDL_ButtonState);

}

static void ClipOffset(Sint16 *x, Sint16 *y)

{

/* This clips absolute mouse coordinates when the apparent

display surface is smaller than the real display surface.

*/

if ( SDL_VideoSurface->offset ) {

*y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch;

*x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/

SDL_VideoSurface->format->BytesPerPixel;

}

}

/* These are global for SDL_eventloop.c */

int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y)

{

int posted;

Uint16 X, Y;

Sint16 Xrel;

Sint16 Yrel;

/* Don't handle mouse motion if there's no cursor surface */

if ( SDL_VideoSurface == NULL ) {

return(0);

}

/* Default buttonstate is the current one */

if ( ! buttonstate ) {

buttonstate = SDL_ButtonState;

}

Xrel = x;

Yrel = y;

if ( relative ) {

/* Push the cursor around */

x = (SDL_MouseX+x);

y = (SDL_MouseY+y);

} else {

/* Do we need to clip {x,y} ? */

ClipOffset(&x, &y);

}

/* Mouse coordinates range from 0 - width-1 and 0 - height-1 */

if ( x < 0 )

X = 0;

else

if ( x >= SDL_VideoSurface->w )

X = SDL_VideoSurface->w-1;

else

X = (Uint16)x;

if ( y < 0 )

Y = 0;

else

if ( y >= SDL_VideoSurface->h )

Y = SDL_VideoSurface->h-1;

else

Y = (Uint16)y;

/* If not relative mode, generate relative motion from clamped X/Y.

This prevents lots of extraneous large delta relative motion when

the screen is windowed mode and the mouse is outside the window.

*/

if ( ! relative ) {

Xrel = X-SDL_MouseX;

Yrel = Y-SDL_MouseY;

}

/* Update internal mouse state */

SDL_ButtonState = buttonstate;

SDL_MouseX = X;

SDL_MouseY = Y;

SDL_DeltaX += Xrel;

SDL_DeltaY += Yrel;

SDL_MoveCursor(SDL_MouseX, SDL_MouseY);

/* Post the event, if desired */

posted = 0;

if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) {

SDL_Event event;

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

event.type = SDL_MOUSEMOTION;

event.motion.state = buttonstate;

event.motion.x = X;

event.motion.y = Y;

event.motion.xrel = Xrel;

event.motion.yrel = Yrel;

if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {

posted = 1;

SDL_PushEvent(&event);

}

}

return(posted);

}

int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y)

{

SDL_Event event;

int posted;

int move_mouse;

Uint8 buttonstate;

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

/* Check parameters */

if ( x || y ) {

ClipOffset(&x, &y);

move_mouse = 1;

/* Mouse coordinates range from 0 - width-1 and 0 - height-1 */

if ( x < 0 )

x = 0;

else

if ( x >= SDL_VideoSurface->w )

x = SDL_VideoSurface->w-1;

if ( y < 0 )

y = 0;

else

if ( y >= SDL_VideoSurface->h )

y = SDL_VideoSurface->h-1;

} else {

move_mouse = 0;

}

if ( ! x )

x = SDL_MouseX;

if ( ! y )

y = SDL_MouseY;

/* Figure out which event to perform */

buttonstate = SDL_ButtonState;

switch ( state ) {

case SDL_PRESSED:

event.type = SDL_MOUSEBUTTONDOWN;

buttonstate |= SDL_BUTTON(button);

break;

case SDL_RELEASED:

event.type = SDL_MOUSEBUTTONUP;

buttonstate &= ~SDL_BUTTON(button);

break;

default:

/* Invalid state -- bail */

return(0);

}

/* Update internal mouse state */

SDL_ButtonState = buttonstate;

if ( move_mouse ) {

SDL_MouseX = x;

SDL_MouseY = y;

SDL_MoveCursor(SDL_MouseX, SDL_MouseY);

}

/* Post the event, if desired */

posted = 0;

if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {

event.button.state = state;

event.button.button = button;

event.button.x = x;

event.button.y = y;

if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {

posted = 1;

SDL_PushEvent(&event);

}

}

return(posted);

}