/*
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
*/
#include "SDL_config.h"
/* General mouse handling code for SDL */
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "../video/SDL_cursor_c.h"
#include "../video/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);
}
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) {
*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)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
/* 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)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
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;
}
/* 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_VideoDevice *_this = SDL_GetVideoDevice();
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);
}
/* vi: set ts=4 sw=4 expandtab: */