sdl_sysevents.c

Simple DirectMedia Layer - Simple DirectMedia Layer 是一个跨平台的多媒体库设计用来提供快速图形framebuffer和音频驱动。应用MPEG为软件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999  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
    [e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_sysevents.c,v 1.22 2002/08/20 05:59:31 slouken Exp $";
#endif

#include <stdlib.h>
#include <stdio.h>
#include <windows.h>

#include "SDL_getenv.h"
#include "SDL_events.h"
#include "SDL_video.h"
#include "SDL_error.h"
#include "SDL_syswm.h"
#include "SDL_sysevents.h"
#include "SDL_events_c.h"
#include "SDL_sysvideo.h"
#include "SDL_lowvideo.h"
#include "SDL_syswm_c.h"
#include "SDL_main.h"

#ifdef WMMSG_DEBUG
#include "wmmsg.h"
#endif

#ifdef _WIN32_WCE
#define NO_GETKEYBOARDSTATE
#define NO_CHANGEDISPLAYSETTINGS
#endif

/* The window we use for everything... */
#ifdef _WIN32_WCE
LPWSTR SDL_Appname = NULL;
#else
LPSTR SDL_Appname = NULL;
#endif
HINSTANCE SDL_Instance = NULL;
HWND SDL_Window = NULL;
RECT SDL_bounds = {0, 0, 0, 0};
int SDL_resizing = 0;
int mouse_relative = 0;
int posted = 0;
#ifndef NO_CHANGEDISPLAYSETTINGS
DEVMODE SDL_fullscreen_mode;
#endif
WORD *gamma_saved = NULL;


/* Functions called by the message processing function */
LONG
(*HandleMessage)(_THIS, HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)=NULL;
void (*WIN_RealizePalette)(_THIS);
void (*WIN_PaletteChanged)(_THIS, HWND window);
void (*WIN_WinPAINT)(_THIS, HDC hdc);
extern void DIB_SwapGamma(_THIS);

static void SDL_RestoreGameMode(void)
{
#ifndef NO_CHANGEDISPLAYSETTINGS
	ShowWindow(SDL_Window, SW_RESTORE);
	ChangeDisplaySettings(&SDL_fullscreen_mode, CDS_FULLSCREEN);
#endif
}
static void SDL_RestoreDesktopMode(void)
{
#ifndef NO_CHANGEDISPLAYSETTINGS
	ShowWindow(SDL_Window, SW_MINIMIZE);
	ChangeDisplaySettings(NULL, 0);
#endif
}

#ifdef WM_MOUSELEAVE
/* 
   Special code to handle mouse leave events - this sucks...
   http://support.microsoft.com/support/kb/articles/q183/1/07.asp

   TrackMouseEvent() is only available on Win98 and WinNT.
   _TrackMouseEvent() is available on Win95, but isn't yet in the mingw32
   development environment, and only works on systems that have had IE 3.0
   or newer installed on them (which is not the case with the base Win95).
   Therefore, we implement our own version of _TrackMouseEvent() which
   uses our own implementation if TrackMouseEvent() is not available.
*/
static BOOL (WINAPI *_TrackMouseEvent)(TRACKMOUSEEVENT *ptme) = NULL;

static VOID CALLBACK
TrackMouseTimerProc(HWND hWnd, UINT uMsg, UINT idEvent, DWORD dwTime)
{
	RECT rect;
	POINT pt;

	GetClientRect(hWnd, &rect);
	MapWindowPoints(hWnd, NULL, (LPPOINT)&rect, 2);
	GetCursorPos(&pt);
	if ( !PtInRect(&rect, pt) || (WindowFromPoint(pt) != hWnd) ) {
		if ( !KillTimer(hWnd, idEvent) ) {
			/* Error killing the timer! */
		}
		PostMessage(hWnd, WM_MOUSELEAVE, 0, 0);
	}
}
static BOOL WINAPI WIN_TrackMouseEvent(TRACKMOUSEEVENT *ptme)
{
	if ( ptme->dwFlags == TME_LEAVE ) {
		return SetTimer(ptme->hwndTrack, ptme->dwFlags, 100,
		                (TIMERPROC)TrackMouseTimerProc);
	}
	return FALSE;
}
#endif /* WM_MOUSELEAVE */

/* Function to retrieve the current keyboard modifiers */
static void WIN_GetKeyboardState(void)
{
#ifndef NO_GETKEYBOARDSTATE
	SDLMod state;
	BYTE keyboard[256];
	Uint8 *kstate = SDL_GetKeyState(NULL);

	state = KMOD_NONE;
	if ( GetKeyboardState(keyboard) ) {
		if ( keyboard[VK_LSHIFT] & 0x80) {
			state |= KMOD_LSHIFT;
		}
		if ( keyboard[VK_RSHIFT] & 0x80) {
			state |= KMOD_RSHIFT;
		}
		if ( keyboard[VK_LCONTROL] & 0x80) {
			state |= KMOD_LCTRL;
		}
		if ( keyboard[VK_RCONTROL] & 0x80) {
			state |= KMOD_RCTRL;
		}
		if ( keyboard[VK_LMENU] & 0x80) {
			state |= KMOD_LALT;
		}
		if ( keyboard[VK_RMENU] & 0x80) {
			state |= KMOD_RALT;
		}
		if ( keyboard[VK_NUMLOCK] & 0x01) {
			state |= KMOD_NUM;
			kstate[SDLK_NUMLOCK] = SDL_PRESSED;
		}
		if ( keyboard[VK_CAPITAL] & 0x01) {
			state |= KMOD_CAPS;
			kstate[SDLK_CAPSLOCK] = SDL_PRESSED;
		}
	}
	SDL_SetModState(state);
#endif /* !NO_GETKEYBOARDSTATE */
}

/* The main Win32 event handler
DJM: This is no longer static as (DX5/DIB)_CreateWindow needs it
*/
LONG CALLBACK WinMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	SDL_VideoDevice *this = current_video;
	static int mouse_pressed = 0;
	static int in_window = 0;
#ifdef WMMSG_DEBUG
	fprintf(stderr, "Received windows message:  ");
	if ( msg > MAX_WMMSG ) {
		fprintf(stderr, "%d", msg);
	} else {
		fprintf(stderr, "%s", wmtab[msg]);
	}
	fprintf(stderr, " -- 0x%X, 0x%X\n", wParam, lParam);
#endif
	switch (msg) {

		case WM_ACTIVATE: {
			SDL_VideoDevice *this = current_video;
			BOOL minimized;
			Uint8 appstate;

			minimized = HIWORD(wParam);
			if ( !minimized && (LOWORD(wParam) != WA_INACTIVE) ) {
				/* Gain the following states */
				appstate = SDL_APPACTIVE|SDL_APPINPUTFOCUS;
				if ( this->input_grab != SDL_GRAB_OFF ) {
					WIN_GrabInput(this, SDL_GRAB_ON);
				}
				if ( !(SDL_GetAppState()&SDL_APPINPUTFOCUS) ) {
					if ( ! DDRAW_FULLSCREEN() ) {
						DIB_SwapGamma(this);
					}
					if ( WINDIB_FULLSCREEN() ) {
						SDL_RestoreGameMode();
					}
				}
				posted = SDL_PrivateAppActive(1, appstate);
				WIN_GetKeyboardState();
			} else {
				/* Lose the following states */
				appstate = SDL_APPINPUTFOCUS;
				if ( minimized ) {
					appstate |= SDL_APPACTIVE;
				}
				if ( this->input_grab != SDL_GRAB_OFF ) {
					WIN_GrabInput(this, SDL_GRAB_OFF);
				}
				if ( SDL_GetAppState() & SDL_APPINPUTFOCUS ) {
					if ( ! DDRAW_FULLSCREEN() ) {
						DIB_SwapGamma(this);
					}
					if ( WINDIB_FULLSCREEN() ) {
						SDL_RestoreDesktopMode();
					}
				}
				posted = SDL_PrivateAppActive(0, appstate);
			}
			return(0);
		}
		break;

		case WM_MOUSEMOVE: {
			
			/* Mouse is handled by DirectInput when fullscreen */
			if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {
				Sint16 x, y;

				/* mouse has entered the window */
				if ( ! in_window ) {
#ifdef WM_MOUSELEAVE
					TRACKMOUSEEVENT tme;

					tme.cbSize = sizeof(tme);
					tme.dwFlags = TME_LEAVE;
					tme.hwndTrack = SDL_Window;
					_TrackMouseEvent(&tme);
#endif /* WM_MOUSELEAVE */
					in_window = TRUE;

					posted = SDL_PrivateAppActive(1, SDL_APPMOUSEFOCUS);
				}

				/* mouse has moved within the window */
				x = LOWORD(lParam);
				y = HIWORD(lParam);
				if ( mouse_relative ) {
					POINT center;
					center.x = (SDL_VideoSurface->w/2);
					center.y = (SDL_VideoSurface->h/2);
					x -= (Sint16)center.x;
					y -= (Sint16)center.y;
					if ( x || y ) {
						ClientToScreen(SDL_Window, &center);
						SetCursorPos(center.x, center.y);
						posted = SDL_PrivateMouseMotion(0, 1, x, y);
					}
				} else {
					posted = SDL_PrivateMouseMotion(0, 0, x, y);
				}
			}
		}
		return(0);

#ifdef WM_MOUSELEAVE
		case WM_MOUSELEAVE: {

			/* Mouse is handled by DirectInput when fullscreen */
			if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {
				/* mouse has left the window */
				/* or */
				/* Elvis has left the building! */
				in_window = FALSE;
				posted = SDL_PrivateAppActive(0, SDL_APPMOUSEFOCUS);
			}
		}
		return(0);
#endif /* WM_MOUSELEAVE */

		case WM_LBUTTONDOWN:
		case WM_LBUTTONUP:
		case WM_MBUTTONDOWN:
		case WM_MBUTTONUP:
		case WM_RBUTTONDOWN:
		case WM_RBUTTONUP: {
			/* Mouse is handled by DirectInput when fullscreen */
			if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {
				Sint16 x, y;
				Uint8 button, state;

				/* DJM:
				   We want the SDL window to take focus so that
				   it acts like a normal windows "component"
				   (e.g. gains keyboard focus on a mouse click).
				 */
				SetFocus(SDL_Window);

				/* Figure out which button to use */
				switch (msg) {
					case WM_LBUTTONDOWN:
						button = SDL_BUTTON_LEFT;
						state = SDL_PRESSED;