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SDL_touch.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2010 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 touch handling code for SDL */
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "../video/SDL_sysvideo.h"
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#include <stdio.h>
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static int SDL_num_touch = 0;
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static SDL_Touch **SDL_touchPads = NULL;
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/* Public functions */
int
SDL_TouchInit(void)
{
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return (0);
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}
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SDL_Touch *
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SDL_GetTouch(int id)
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{
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int index = SDL_GetTouchIndexId(id);
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if (index < 0 || index >= SDL_num_touch) {
return NULL;
}
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return SDL_touchPads[index];
}
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SDL_Touch *
SDL_GetTouchIndex(int index)
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{
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if (index < 0 || index >= SDL_num_touch) {
return NULL;
}
return SDL_touchPads[index];
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}
int
SDL_GetFingerIndexId(SDL_Touch* touch,int fingerid)
{
int i;
for(i = 0;i < touch->num_fingers;i++)
if(touch->fingers[i]->id == fingerid)
return i;
return -1;
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}
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SDL_Finger *
SDL_GetFinger(SDL_Touch* touch,int id)
{
int index = SDL_GetFingerIndexId(touch,id);
if(index < 0 || index >= touch->num_fingers)
return NULL;
return touch->fingers[index];
}
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int
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SDL_GetTouchIndexId(int id)
{
int index;
SDL_Touch *touch;
for (index = 0; index < SDL_num_touch; ++index) {
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touch = SDL_touchPads[index];
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if (touch->id == id) {
return index;
}
}
return -1;
}
int
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SDL_AddTouch(const SDL_Touch * touch, char *name)
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{
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SDL_Touch **touchPads;
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int index,length;
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if (SDL_GetTouchIndexId(touch->id) != -1) {
SDL_SetError("Touch ID already in use");
}
/* Add the touch to the list of touch */
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touchPads = (SDL_Touch **) SDL_realloc(SDL_touchPads,
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(SDL_num_touch + 1) * sizeof(*touch));
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if (!touchPads) {
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SDL_OutOfMemory();
return -1;
}
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SDL_touchPads = touchPads;
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index = SDL_num_touch++;
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SDL_touchPads[index] = (SDL_Touch *) SDL_malloc(sizeof(*SDL_touchPads[index]));
if (!SDL_touchPads[index]) {
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SDL_OutOfMemory();
return -1;
}
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*SDL_touchPads[index] = *touch;
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/* we're setting the touch properties */
length = 0;
length = SDL_strlen(name);
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SDL_touchPads[index]->focus = 0;
SDL_touchPads[index]->name = SDL_malloc((length + 2) * sizeof(char));
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SDL_strlcpy(SDL_touchPads[index]->name, name, length + 1);
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SDL_touchPads[index]->num_fingers = 0;
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SDL_touchPads[index]->max_fingers = 1;
SDL_touchPads[index]->fingers = (SDL_Finger **) SDL_malloc(sizeof(SDL_Finger*));
SDL_touchPads[index]->fingers[0] = NULL;
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SDL_touchPads[index]->buttonstate = 0;
SDL_touchPads[index]->relative_mode = SDL_FALSE;
SDL_touchPads[index]->flush_motion = SDL_FALSE;
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//Do I want this here? Probably
SDL_GestureAddTouch(SDL_touchPads[index]);
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return index;
}
void
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SDL_DelTouch(int id)
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{
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int index = SDL_GetTouchIndexId(id);
SDL_Touch *touch = SDL_GetTouch(id);
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if (!touch) {
return;
}
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SDL_free(touch->name);
if (touch->FreeTouch) {
touch->FreeTouch(touch);
}
SDL_free(touch);
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SDL_num_touch--;
SDL_touchPads[index] = SDL_touchPads[SDL_num_touch];
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}
void
SDL_TouchQuit(void)
{
int i;
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for (i = SDL_num_touch-1; i > 0 ; --i) {
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SDL_DelTouch(i);
}
SDL_num_touch = 0;
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if (SDL_touchPads) {
SDL_free(SDL_touchPads);
SDL_touchPads = NULL;
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}
}
int
SDL_GetNumTouch(void)
{
return SDL_num_touch;
}
SDL_Window *
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SDL_GetTouchFocusWindow(int id)
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{
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SDL_Touch *touch = SDL_GetTouch(id);
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if (!touch) {
return 0;
}
return touch->focus;
}
void
SDL_SetTouchFocus(int id, SDL_Window * window)
{
int index = SDL_GetTouchIndexId(id);
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SDL_Touch *touch = SDL_GetTouch(id);
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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) {
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check = SDL_touchPads[i];
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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) {
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check = SDL_touchPads[i];
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if (check && check->focus == touch->focus) {
focus = SDL_TRUE;
break;
}
}
}
if (!focus) {
SDL_SendWindowEvent(touch->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
}
}
}
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int
SDL_AddFinger(SDL_Touch* touch,SDL_Finger* finger)
{
int index;
SDL_Finger **fingers;
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//printf("Adding Finger...\n");
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if (SDL_GetFingerIndexId(touch,finger->id) != -1) {
SDL_SetError("Finger ID already in use");
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}
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/* Add the touch to the list of touch */
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if(touch->num_fingers >= touch->max_fingers){
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//printf("Making room for it!\n");
fingers = (SDL_Finger **) SDL_realloc(touch->fingers,
(touch->num_fingers + 1) * sizeof(SDL_Finger *));
touch->max_fingers = touch->num_fingers+1;
if (!fingers) {
SDL_OutOfMemory();
return -1;
} else {
touch->max_fingers = touch->num_fingers+1;
touch->fingers = fingers;
}
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}
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index = touch->num_fingers;
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//printf("Max_Fingers: %i Index: %i\n",touch->max_fingers,index);
touch->fingers[index] = (SDL_Finger *) SDL_malloc(sizeof(SDL_Finger));
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if (!touch->fingers[index]) {
SDL_OutOfMemory();
return -1;
}
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*(touch->fingers[index]) = *finger;
touch->num_fingers++;
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return index;
}
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int
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SDL_DelFinger(SDL_Touch* touch,int fingerid)
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{
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int index = SDL_GetFingerIndexId(touch,fingerid);
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SDL_Finger* finger = SDL_GetFinger(touch,fingerid);
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if (!finger) {
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return -1;
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}
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SDL_free(finger);
touch->num_fingers--;
touch->fingers[index] = touch->fingers[touch->num_fingers];
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return 0;
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}
int
SDL_SendFingerDown(int id, int fingerid, SDL_bool down, int x, int y, int pressure)
{
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int posted;
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SDL_Touch* touch = SDL_GetTouch(id);
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if(!touch) {
return SDL_TouchNotFoundError(id);
}
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if(down) {
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SDL_Finger *finger = SDL_GetFinger(touch,fingerid);
if(finger == NULL) {
SDL_Finger nf;
nf.id = fingerid;
nf.x = x;
nf.y = y;
nf.pressure = pressure;
nf.xdelta = 0;
nf.ydelta = 0;
nf.last_x = x;
nf.last_y = y;
nf.last_pressure = pressure;
nf.down = SDL_FALSE;
SDL_AddFinger(touch,&nf);
finger = &nf;
}
else if(finger->down) return 0;
if(x < 0 || y < 0) return 0; //should defer if only a partial input
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posted = 0;
if (SDL_GetEventState(SDL_FINGERDOWN) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERDOWN;
event.tfinger.touchId = (Uint8) id;
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event.tfinger.x = x;
event.tfinger.y = y;
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event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
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event.tfinger.fingerId = fingerid;
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posted = (SDL_PushEvent(&event) > 0);
}
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if(posted) finger->down = SDL_TRUE;
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return posted;
}
else {
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if(SDL_DelFinger(touch,fingerid) < 0) return 0;
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posted = 0;
if (SDL_GetEventState(SDL_FINGERUP) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERUP;
event.tfinger.touchId = (Uint8) id;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
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event.tfinger.fingerId = fingerid;
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posted = (SDL_PushEvent(&event) > 0);
}
return posted;
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}
}
int
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SDL_SendTouchMotion(int id, int fingerid, int relative,
int x, int y, int pressure)
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{
int index = SDL_GetTouchIndexId(id);
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SDL_Touch *touch = SDL_GetTouch(id);
SDL_Finger *finger = SDL_GetFinger(touch,fingerid);
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int posted;
int xrel;
int yrel;
int x_max = 0, y_max = 0;
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if (!touch) {
return SDL_TouchNotFoundError(id);
}
if(touch->flush_motion) {
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return 0;
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}
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if(finger == NULL || !finger->down) {
return SDL_SendFingerDown(id,fingerid,SDL_TRUE,x,y,pressure);
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} else {
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/* 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(x < 0) x = finger->last_x; /*If movement is only in one axis,*/
if(y < 0) y = finger->last_y; /*The other is marked as -1*/
if(pressure < 0) pressure = finger->last_pressure;
xrel = x - finger->last_x;
yrel = y - finger->last_y;
}
/* Drop events that don't change state */
if (!xrel && !yrel) {
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#if 0
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printf("Touch 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 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 = (Uint8) id;
event.tfinger.fingerId = (Uint8) fingerid;
event.tfinger.x = x;
event.tfinger.y = y;
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;
}
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}
int
SDL_SendTouchButton(int id, Uint8 state, Uint8 button)
{
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SDL_Touch *touch = SDL_GetTouch(id);
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int posted;
Uint32 type;
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if (!touch) {
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return SDL_TouchNotFoundError(id);
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}
/* Figure out which event to perform */
switch (state) {
case SDL_PRESSED:
if (touch->buttonstate & SDL_BUTTON(button)) {
/* Ignore this event, no state change */
return 0;
}
type = SDL_TOUCHBUTTONDOWN;
touch->buttonstate |= SDL_BUTTON(button);
break;
case SDL_RELEASED:
if (!(touch->buttonstate & SDL_BUTTON(button))) {
/* Ignore this event, no state change */
return 0;
}
type = SDL_TOUCHBUTTONUP;
touch->buttonstate &= ~SDL_BUTTON(button);
break;
default:
/* Invalid state -- bail */
return 0;
}
/* Post the event, if desired */
posted = 0;
if (SDL_GetEventState(type) == SDL_ENABLE) {
SDL_Event event;
event.type = type;
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event.tbutton.touchId = (Uint8) touch->id;
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event.tbutton.state = state;
event.tbutton.button = button;
event.tbutton.windowID = touch->focus ? touch->focus->id : 0;
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posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
char *
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SDL_GetTouchName(int id)
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{
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SDL_Touch *touch = SDL_GetTouch(id);
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if (!touch) {
return NULL;
}
return touch->name;
}
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int SDL_TouchNotFoundError(int id) {
printf("ERROR: Cannot send touch on non-existent device with id: %i make sure SDL_AddTouch has been called\n",id);
printf("ERROR: There are %i touches installed with Id's:\n",SDL_num_touch);
int i;
for(i=0;i < SDL_num_touch;i++) {
printf("ERROR: %i\n",SDL_touchPads[i]->id);
}
return 0;
}
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/* vi: set ts=4 sw=4 expandtab: */