SDL_Touch *
SDL_GetTouch(SDL_TouchID id)
{
int index = SDL_GetTouchIndexId(id);
if (index < 0 || index >= SDL_num_touch) {
return NULL;
}
return SDL_touchPads[index];
}
int
SDL_AddTouch(const SDL_Touch * touch, char *name)
{
SDL_Touch **touchPads;
int index;
size_t length;
if (SDL_GetTouchIndexId(touch->id) != -1) {
SDL_SetError("Touch ID already in use");
}
/* Add the touch to the list of touch */
touchPads = (SDL_Touch **) SDL_realloc(SDL_touchPads,
(SDL_num_touch + 1) * sizeof(*touch));
if (!touchPads) {
SDL_OutOfMemory();
return -1;
}
SDL_touchPads = touchPads;
index = SDL_num_touch++;
SDL_touchPads[index] = (SDL_Touch *) SDL_malloc(sizeof(*SDL_touchPads[index]));
if (!SDL_touchPads[index]) {
SDL_OutOfMemory();
return -1;
}
SDL_memcpy(SDL_touchPads[index], touch, sizeof(*touch));
/* we're setting the touch properties */
length = 0;
length = SDL_strlen(name);
SDL_touchPads[index]->focus = 0;
SDL_touchPads[index]->name = SDL_malloc((length + 2) * sizeof(char));
SDL_strlcpy(SDL_touchPads[index]->name, name, length + 1);
SDL_touchPads[index]->num_fingers = 0;
SDL_touchPads[index]->max_fingers = 1;
SDL_touchPads[index]->fingers = (SDL_Finger **) SDL_malloc(sizeof(SDL_Finger*));
SDL_touchPads[index]->fingers[0] = NULL;
SDL_touchPads[index]->buttonstate = 0;
SDL_touchPads[index]->relative_mode = SDL_FALSE;
SDL_touchPads[index]->flush_motion = SDL_FALSE;
SDL_touchPads[index]->xres = (1<<(16-1));
SDL_touchPads[index]->yres = (1<<(16-1));
SDL_touchPads[index]->pressureres = (1<<(16-1));
//Do I want this here? Probably
SDL_GestureAddTouch(SDL_touchPads[index]);
return index;
}
void
SDL_SetTouchFocus(SDL_TouchID id, SDL_Window * window)
{
int index = SDL_GetTouchIndexId(id);
SDL_Touch *touch = SDL_GetTouch(id);
int i;
SDL_bool focus;
if (!touch || (touch->focus == window)) {
return;
}
/* See if the current window has lost focus */
if (touch->focus) {
focus = SDL_FALSE;
for (i = 0; i < SDL_num_touch; ++i) {
SDL_Touch *check;
if (i != index) {
check = SDL_touchPads[i];
if (check && check->focus == touch->focus) {
focus = SDL_TRUE;
break;
}
}
}
if (!focus) {
SDL_SendWindowEvent(touch->focus, SDL_WINDOWEVENT_LEAVE, 0, 0);
}
}
touch->focus = window;
if (touch->focus) {
focus = SDL_FALSE;
for (i = 0; i < SDL_num_touch; ++i) {
SDL_Touch *check;
if (i != index) {
check = SDL_touchPads[i];
if (check && check->focus == touch->focus) {
focus = SDL_TRUE;
break;
}
}
}
if (!focus) {
SDL_SendWindowEvent(touch->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
}
}
}
void
SDL_DelTouch(SDL_TouchID id)
{
int index = SDL_GetTouchIndexId(id);
SDL_Touch *touch = SDL_GetTouch(id);
if (!touch) {
return;
}
SDL_free(touch->name);
if (touch->FreeTouch) {
touch->FreeTouch(touch);
}
SDL_free(touch);
SDL_num_touch--;
SDL_touchPads[index] = SDL_touchPads[SDL_num_touch];
}
int
SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid, int relative,
float xin, float yin, float pressurein)
{
int index = SDL_GetTouchIndexId(id);
SDL_Touch *touch = SDL_GetTouch(id);
SDL_Finger *finger = SDL_GetFinger(touch,fingerid);
int posted;
Sint16 xrel, yrel;
float x_max = 0, y_max = 0;
Uint16 x;
Uint16 y;
Uint16 pressure;
if (!touch) {
return SDL_TouchNotFoundError(id);
}
//scale to Integer coordinates
x = (Uint16)((xin+touch->x_min)*(touch->xres)/(touch->native_xres));
y = (Uint16)((yin+touch->y_min)*(touch->yres)/(touch->native_yres));
pressure = (Uint16)((yin+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
if(touch->flush_motion) {
return 0;
}
if(finger == NULL || !finger->down) {
return SDL_SendFingerDown(id,fingerid,SDL_TRUE,xin,yin,pressurein);
} else {
/* the relative motion is calculated regarding the last position */
if (relative) {
xrel = x;
yrel = y;
x = (finger->last_x + x);
y = (finger->last_y + y);
} else {
if(xin < touch->x_min) x = finger->last_x; /*If movement is only in one axis,*/
if(yin < touch->y_min) y = finger->last_y; /*The other is marked as -1*/
if(pressurein < touch->pressure_min) pressure = finger->last_pressure;
xrel = x - finger->last_x;
yrel = y - finger->last_y;
//printf("xrel,yrel (%i,%i)\n",(int)xrel,(int)yrel);
}
/* Drop events that don't change state */
if (!xrel && !yrel) {
#if 0
printf("Touch event didn't change state - dropped!\n");
#endif
return 0;
}
/* Update internal touch coordinates */
finger->x = x;
finger->y = y;
/*Should scale to window? Normalize? Maintain Aspect?*/
//SDL_GetWindowSize(touch->focus, &x_max, &y_max);
/* make sure that the pointers find themselves inside the windows */
/* only check if touch->xmax is set ! */
/*
if (x_max && touch->x > x_max) {
touch->x = x_max;
} else if (touch->x < 0) {
touch->x = 0;
}
if (y_max && touch->y > y_max) {
touch->y = y_max;
} else if (touch->y < 0) {
touch->y = 0;
}
*/
finger->xdelta = xrel;
finger->ydelta = yrel;
finger->pressure = pressure;
/* Post the event, if desired */
posted = 0;
if (SDL_GetEventState(SDL_FINGERMOTION) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERMOTION;
event.tfinger.touchId = id;
event.tfinger.fingerId = fingerid;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = xrel;
event.tfinger.dy = yrel;
event.tfinger.pressure = pressure;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
posted = (SDL_PushEvent(&event) > 0);
}
finger->last_x = finger->x;
finger->last_y = finger->y;
finger->last_pressure = finger->pressure;
return posted;
}
}