view src/events/SDL_mouse.c @ 1348:40d0975c1769

Date: Mon, 6 Feb 2006 11:41:04 -0500 From: "mystml@adinet.com.uy" Subject: [SDL] ALT-F4 using DirectX My game isn't getting SDL_QUIT when I press ALT-F4 using the DirectX driver; it does get SDL_QUIT when I press the red X in the window. I tracked this down to DX5_HandleMessage() in SDL_dx5events.c; WM_SYSKEYDOWN is being trapped and ignored which causes Windows not to post a WM_CLOSE, hence no SDL_QUIT is being generated. The relevant code is this : /* The keyboard is handled via DirectInput */ case WM_SYSKEYUP: case WM_SYSKEYDOWN: case WM_KEYUP: case WM_KEYDOWN: { /* Ignore windows keyboard messages */; } return(0); If I comment the WM_SYSKEYDOWN case, it falls through DefWindowProc() and ALT-F4 starts working again. I'm not sure about the best way to fix this. One option is handling ALT-F4 as a particular case somehow, but doesn't sound good. Another option would be to handle WM_SYSKEYDOWN separately and breaking instead of returning 0, so processing falls through and goes to DefWindowProc which does The Right Thing (TM). This seems to be the minimal change that makes ALT-F4 work and normal keyboard input continues to work. Does this sound reasonable? Am I overlooking anything? Do I submit a patch? --Gabriel
author Sam Lantinga <slouken@libsdl.org>
date Wed, 08 Feb 2006 17:19:43 +0000
parents 3692456e7b0f
children c71e05b4dc2e
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/* General mouse handling code for SDL */

#include "SDL_events.h"
#include "SDL_string.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 = -1;
static Sint16 SDL_MouseY = -1;
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 = -1;
	SDL_MouseY = -1;
	SDL_DeltaX = 0;
	SDL_DeltaY = 0;
	SDL_ButtonState = 0;

	/* That's it! */
	return(0);
}
void SDL_MouseQuit(void)
{
}

/* We lost the mouse, so post button up messages for all pressed buttons */
void SDL_ResetMouse(void)
{
	Uint8 i;
	for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) {
		if ( SDL_ButtonState & SDL_BUTTON(i) ) {
			SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0);
		}
	}
}

Uint8 SDL_GetMouseState (int *x, int *y)
{
	if ( x ) {
		if ( SDL_MouseX < 0 ) {
			*x = 0;
		} else {
			*x = SDL_MouseX;
		}
	}
	if ( y ) {
		if ( SDL_MouseY < 0 ) {
			*y = 0;
		} else {
			*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 && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) {
		Xrel = X-SDL_MouseX;
		Yrel = Y-SDL_MouseY;
	}

	/* Drop events that don't change state */
	if ( ! Xrel && ! Yrel ) {
#if 0
printf("Mouse event didn't change state - dropped!\n");
#endif
		return(0);
	}

	/* 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;
		SDL_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;

	SDL_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);
}