src/events/SDL_mouse.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 29 May 2006 04:04:35 +0000
branchSDL-1.3
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* General mouse handling code for SDL */
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#include "SDL_events.h"
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#include "SDL_events_c.h"
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#include "../video/SDL_cursor_c.h"
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#include "../video/SDL_sysvideo.h"
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/* These are static for our mouse handling code */
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static Sint16 SDL_MouseX = 0;
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static Sint16 SDL_MouseY = 0;
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static Sint16 SDL_DeltaX = 0;
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static Sint16 SDL_DeltaY = 0;
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static Uint8 SDL_ButtonState = 0;
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/* Public functions */
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int
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SDL_MouseInit(void)
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{
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    /* The mouse is at (0,0) */
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    SDL_MouseX = 0;
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    SDL_MouseY = 0;
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    SDL_DeltaX = 0;
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    SDL_DeltaY = 0;
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    SDL_ButtonState = 0;
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    /* That's it! */
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    return (0);
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}
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void
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SDL_MouseQuit(void)
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{
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}
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/* We lost the mouse, so post button up messages for all pressed buttons */
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void
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SDL_ResetMouse(void)
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{
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    Uint8 i;
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    for (i = 0; i < sizeof(SDL_ButtonState) * 8; ++i) {
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        if (SDL_ButtonState & SDL_BUTTON(i)) {
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            SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0);
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        }
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    }
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}
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Uint8
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SDL_GetMouseState(int *x, int *y)
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{
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    if (x) {
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        *x = SDL_MouseX;
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    }
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    if (y) {
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        *y = SDL_MouseY;
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    }
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    return (SDL_ButtonState);
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}
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Uint8
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SDL_GetRelativeMouseState(int *x, int *y)
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{
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    if (x)
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        *x = SDL_DeltaX;
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    if (y)
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        *y = SDL_DeltaY;
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    SDL_DeltaX = 0;
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    SDL_DeltaY = 0;
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    return (SDL_ButtonState);
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}
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static void
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ClipOffset(Sint16 * x, Sint16 * y)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    /* This clips absolute mouse coordinates when the apparent
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       display surface is smaller than the real display surface.
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     */
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    if (SDL_VideoSurface->offset) {
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        *y -= SDL_VideoSurface->offset / SDL_VideoSurface->pitch;
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        *x -= (SDL_VideoSurface->offset % SDL_VideoSurface->pitch) /
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            SDL_VideoSurface->format->BytesPerPixel;
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    }
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}
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/* These are global for SDL_eventloop.c */
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int
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SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    int posted;
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    Uint16 X, Y;
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    Sint16 Xrel;
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    Sint16 Yrel;
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    /* Don't handle mouse motion if there's no cursor surface */
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    if (SDL_VideoSurface == NULL) {
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        return (0);
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    }
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    /* Default buttonstate is the current one */
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    if (!buttonstate) {
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        buttonstate = SDL_ButtonState;
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    }
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    Xrel = x;
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    Yrel = y;
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    if (relative) {
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        /* Push the cursor around */
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        x = (SDL_MouseX + x);
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        y = (SDL_MouseY + y);
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    } else {
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        /* Do we need to clip {x,y} ? */
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        ClipOffset(&x, &y);
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    }
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    /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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    if (x < 0)
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        X = 0;
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    else if (x >= SDL_VideoSurface->w)
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        X = SDL_VideoSurface->w - 1;
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    else
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        X = (Uint16) x;
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    if (y < 0)
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        Y = 0;
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    else if (y >= SDL_VideoSurface->h)
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        Y = SDL_VideoSurface->h - 1;
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    else
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        Y = (Uint16) y;
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    /* If not relative mode, generate relative motion from clamped X/Y.
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       This prevents lots of extraneous large delta relative motion when
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       the screen is windowed mode and the mouse is outside the window.
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     */
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    if (!relative) {
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        Xrel = X - SDL_MouseX;
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        Yrel = Y - SDL_MouseY;
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    }
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    /* Drop events that don't change state */
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    if (!Xrel && !Yrel) {
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#if 0
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        printf("Mouse event didn't change state - dropped!\n");
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#endif
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        return (0);
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    }
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    /* Update internal mouse state */
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    SDL_ButtonState = buttonstate;
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    SDL_MouseX = X;
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    SDL_MouseY = Y;
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    SDL_DeltaX += Xrel;
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    SDL_DeltaY += Yrel;
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    SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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    /* Post the event, if desired */
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    posted = 0;
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    if (SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE) {
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        SDL_Event event;
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        SDL_memset(&event, 0, sizeof(event));
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        event.type = SDL_MOUSEMOTION;
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        event.motion.state = buttonstate;
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        event.motion.x = X;
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        event.motion.y = Y;
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        event.motion.xrel = Xrel;
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        event.motion.yrel = Yrel;
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        if ((SDL_EventOK == NULL) || (*SDL_EventOK) (&event)) {
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            posted = 1;
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            SDL_PushEvent(&event);
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        }
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   197
    }
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    return (posted);
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}
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int
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SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    SDL_Event event;
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   206
    int posted;
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    int move_mouse;
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    Uint8 buttonstate;
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    SDL_memset(&event, 0, sizeof(event));
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    /* Check parameters */
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    if (x || y) {
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        ClipOffset(&x, &y);
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        move_mouse = 1;
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        /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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        if (x < 0)
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            x = 0;
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        else if (x >= SDL_VideoSurface->w)
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            x = SDL_VideoSurface->w - 1;
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   221
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        if (y < 0)
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            y = 0;
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   224
        else if (y >= SDL_VideoSurface->h)
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            y = SDL_VideoSurface->h - 1;
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   226
    } else {
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        move_mouse = 0;
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   228
    }
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   229
    if (!x)
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        x = SDL_MouseX;
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   231
    if (!y)
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        y = SDL_MouseY;
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   234
    /* Figure out which event to perform */
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    buttonstate = SDL_ButtonState;
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   236
    switch (state) {
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   237
    case SDL_PRESSED:
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        event.type = SDL_MOUSEBUTTONDOWN;
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        buttonstate |= SDL_BUTTON(button);
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        break;
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   241
    case SDL_RELEASED:
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        event.type = SDL_MOUSEBUTTONUP;
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   243
        buttonstate &= ~SDL_BUTTON(button);
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        break;
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    default:
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        /* Invalid state -- bail */
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        return (0);
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    }
0
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    /* Update internal mouse state */
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    SDL_ButtonState = buttonstate;
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    if (move_mouse) {
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        SDL_MouseX = x;
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        SDL_MouseY = y;
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        SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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    }
0
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    /* Post the event, if desired */
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    posted = 0;
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    if (SDL_ProcessEvents[event.type] == SDL_ENABLE) {
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        event.button.state = state;
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        event.button.button = button;
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        event.button.x = x;
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        event.button.y = y;
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        if ((SDL_EventOK == NULL) || (*SDL_EventOK) (&event)) {
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            posted = 1;
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            SDL_PushEvent(&event);
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        }
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    }
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    return (posted);
0
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}
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/* vi: set ts=4 sw=4 expandtab: */