/***************************************************************************                          event.c  -  description                             -------------------    begin                : Sat Sep 8 2001    copyright            : (C) 2001 by Michael Speck    email                : kulkanie@gmx.net ***************************************************************************//*************************************************************************** *                                                                         * *   This program is free software; you can redistribute it and/or modify  * *   it under the terms of the GNU General Public License as published by  * *   the Free Software Foundation; either version 2 of the License, or     * *   (at your option) any later version.                                   * *                                                                         * ***************************************************************************/#include "ltris.h"#include "event.h"extern Sdl sdl;extern SDL_Cursor *empty_cursor;extern SDL_Cursor *std_cursor;extern Config config;int keystate[SDLK_LAST];int buttonstate[BUTTON_COUNT];int rel_motion = 0; /* relative mouse motion? */int motion_x = 0, motion_y = 0; /* current position of mouse */int motion_rel_x = 0; /* position of mouse relative to old position */int motion = 0; /* motion occured? */int motion_button = 0; /* button pressed while moving */float motion_mod;/* interna */int intern_motion = 0; /* event_filter noted a motion so event_poll will set motion next time */int intern_motion_rel_x = 0;int intern_motion_x = 0, intern_motion_y = 0;int intern_motion_last_x, intern_motion_last_y = 0;int intern_motion_button = 0;int intern_block_motion = 0;/*====================================================================Event filter used to get motion x.====================================================================*/int event_filter( const SDL_Event *event ){    /* if this is a mousemotion event get the latest mouse position    and set motion and motion_x and drop this event */    /* event_poll does not return any motion events instead motion_x    is used directly */    if ( event->type == SDL_MOUSEMOTION ) {        if ( intern_block_motion ) return 0;        /* mouse warp to keep in window */        if ( !intern_motion ) {            intern_motion_last_x = intern_motion_x;            intern_motion_last_y = intern_motion_y;            intern_motion = 1;            intern_motion_rel_x = event->motion.xrel;        }        else            intern_motion_rel_x += event->motion.xrel;        intern_motion_x = event->motion.x;        intern_motion_y = event->motion.y;        intern_motion_button = event->motion.state;        return 0;    }    return 1;}/*====================================================================Reset event states====================================================================*/void event_reset(){    memset( &keystate, 0, sizeof( int ) * SDLK_LAST );    memset( &buttonstate, 0, sizeof( int ) * BUTTON_COUNT );    motion_mod = (float)(config.motion_mod) / 100;    intern_motion = motion = 0;}/*====================================================================Grab or release input. Hide cursor if events are kept in window.Use relative mouse motion and grab if config tells so.====================================================================*/void event_grab_input(){    /* if rel_motion is set the global rel_motion_x is updated by event_poll()    (internal value is always updated by event_filter()) */    rel_motion = config.rel_motion;    /* use empty cursor if fullscreen or grab is set */    if ( config.grab || sdl.screen->flags & SDL_FULLSCREEN ) SDL_SetCursor( empty_cursor );    /* grab input if grab activated or rel_motion is set as we have to grab the input    and hide the cursor if so */    if ( config.grab || rel_motion ) SDL_WM_GrabInput( SDL_GRAB_ON );    /* if rel_motion is set hide the cursor to get relative motion events even when    cursor hits the border (due to grab) */    if ( rel_motion ) SDL_ShowCursor( 0 );}void event_ungrab_input(){    /* show cursor, grab nothing */    SDL_WM_GrabInput( SDL_GRAB_OFF );    rel_motion = 0;    SDL_ShowCursor( 1 ); SDL_SetCursor( std_cursor );}/*====================================================================Poll next event and set key and mousestate.Return Value: True if event occured====================================================================*/int event_poll( SDL_Event *event ){    motion = 0;    /* check if motion occured: does not cause an event */    if ( intern_motion ) {        /* gather all motion events to one absolute/relative position until        event_poll is called next time */        intern_motion = 0;        /* if either absolute position is used or relative motion occured set motion flag        so paddle may move */        if ( !rel_motion || intern_motion_rel_x ) motion = 1;        /* absolute position */        motion_x = intern_motion_x;        motion_y = intern_motion_y;        /* button */        motion_button = intern_motion_button;        /* use motion modifier and invert if wanted */        if ( rel_motion && motion ) {            motion_rel_x = (int)( motion_mod * intern_motion_rel_x );            if ( config.invert ) motion_rel_x = -motion_rel_x;#ifdef MOUSE_WARP            /* reset mouse pointer as current solution does not work for            BeOS */            SDL_EventState( SDL_MOUSEMOTION, SDL_IGNORE );            SDL_WarpMouse(sdl.screen->w >> 1, sdl.screen->h >> 1);            SDL_EventState( SDL_MOUSEMOTION, SDL_ENABLE );#endif        }    }    /* check queued events */    if ( SDL_PollEvent( event ) ) {       if( event->key.keysym.sym >= SDLK_LAST )	   	return -1;		        switch ( event->type ) {            case SDL_QUIT: return 1;            case SDL_MOUSEBUTTONUP: buttonstate[event->button.button] = 0; return 1;            case SDL_MOUSEBUTTONDOWN: buttonstate[event->button.button] = 1; return 1;            case SDL_KEYUP: keystate[event->key.keysym.sym] = 0; return 1;            case SDL_KEYDOWN: keystate[event->key.keysym.sym] = 1; return 1;            default: return 1;        }    }    return 0;}/*====================================================================Block/unblock motion event====================================================================*/void event_block_motion( int block ){    intern_block_motion = block;}