MoveEvent* TouchDevice::ReadSingleTouchEvent(int touch_device)
{
MoveEvent moveEvent;
TOUCH_DEVICE_STATUS tds = DEVICE_TOUCH_NONE;;
int x, y;
read(touch_device, &tds, sizeof(tds));
read(touch_device, &x, sizeof(x));
read(touch_device, &y, sizeof(y));
switch (tds)
{
case DEVICE_TOUCH_START:
moveEvent.m_action = MoveEvent::ACTION_DOWN;
break;
case DEVICE_TOUCH_END:
moveEvent.m_action = MoveEvent::ACTION_UP;
break;
case DEVICE_TOUCH_UPDATE:
moveEvent.m_action = MoveEvent::ACTION_MOVE;
break;
case DEVICE_TOUCH_NONE:
case DEVICE_TOUCH_POINTER_DOWN:
case DEVICE_TOUCH_POINTER_UP:
default:
break;
}
x = GetScreenHorizonPostion(x);
y = GetScreenVerticalPostion(y);
moveEvent.m_x[0] = x;
moveEvent.m_y[0] = y;
moveEvent.m_pointerId[0] = 0;
moveEvent.m_pointerCount = 1;
moveEvent.m_eventTime = SystemUtil::GetUpdateTimeInMs();
return moveEvent.Clone();
}
//maybe just update one of x/y
MoveEvent* TouchDevice::ReadSingleTouchEvent(int _touch_device)
{
struct input_event iebuf;
MoveEvent moveEvent;
int moveAction = MoveEvent::ACTION_MASK;
int curActionIndex = -1;
int curIndex = -1;
static int s_oldX[2] = {-1, -1};
static int s_oldY[2] = {-1, -1};
static int index2Slots[2] ={-1, -1};
static int64_t downTime = -1;
int readCount = 0;
for (;;)
{
if (read(_touch_device, &iebuf, sizeof(iebuf)) >0 )
{
if (EV_ABS == iebuf.type)
{
++readCount;
}
DebugPrintf(DLC_GESTURE, "type: %d, code: %d, value: %d", iebuf.type, iebuf.code, iebuf.value);
if (iebuf.type == EV_ABS && iebuf.code == ABS_MT_SLOT)
{
s_curSlotId = iebuf.value;
continue;
}
if (iebuf.type == EV_ABS && iebuf.code == ABS_MT_TRACKING_ID && iebuf.value >=0)
{
++curIndex;
index2Slots[curIndex] = s_curSlotId;
++s_curPointerCount;
if (1 == s_curPointerCount)
{
moveAction = MoveEvent::ACTION_DOWN;
downTime = SystemUtil::GetUpdateTimeInMs();
}
else if (2 == s_curPointerCount)
{
moveAction = MoveEvent::ACTION_POINTER_DOWN;
}
curActionIndex = curIndex;
}
if (iebuf.type == EV_ABS && iebuf.code == ABS_MT_TRACKING_ID && iebuf.value ==-1)
{
++curIndex;
index2Slots[curIndex] = s_curSlotId;
--s_curPointerCount;
curActionIndex = curIndex;
if (1 == s_curPointerCount)
{
moveAction = MoveEvent::ACTION_POINTER_UP;
// sometimes we get two ABS_MT_TRACKING_ID in one loop
// and must break it in two
break;
}
else if (0 == s_curPointerCount)
{
moveAction = MoveEvent::ACTION_UP;
}
}
if (iebuf.type == EV_ABS && iebuf.code == ABS_MT_POSITION_X)
{
if (-1 == curIndex || s_curSlotId != index2Slots[curIndex])
{
++curIndex;
index2Slots[curIndex] = s_curSlotId;
}
if (-1 == curActionIndex)
{
curActionIndex = curIndex;
}
s_oldX[s_curSlotId] = GetScreenHorizonPostion(iebuf.value);
if (MoveEvent::ACTION_MASK == moveAction)
{
moveAction = MoveEvent::ACTION_MOVE;
}
}
if (iebuf.type == EV_ABS && iebuf.code == ABS_MT_POSITION_Y)
{
if (-1 == curIndex || s_curSlotId != index2Slots[curIndex])
{
++curIndex;
index2Slots[curIndex] = s_curSlotId;
}
if (-1 == curActionIndex)
{
curActionIndex = curIndex;
}
s_oldY[s_curSlotId] = GetScreenVerticalPostion(iebuf.value);
if (MoveEvent::ACTION_MASK == moveAction)
{
moveAction = MoveEvent::ACTION_MOVE;
}
if (MoveEvent::ACTION_DOWN == moveAction)
{
// 有可能action_down后还有一个action_pointer_down
// 需要拆成两个move event
break;
}
}
if (iebuf.type == EV_SYN && iebuf.code == SYN_REPORT && iebuf.value ==0)
{
break;
}
}
else
{
break;
}
}
// previous read bread before read (0, 0, 0)
// currently only read (0, 0, 0)
if (0 == readCount)
{
return NULL;
}
moveEvent.m_pointerCount = curIndex + 1;
moveEvent.m_action = moveAction;
moveEvent.m_downTime = downTime;
for (int i = 0; i < moveEvent.m_pointerCount; ++i)
{
moveEvent.m_x[i] = s_oldX[index2Slots[i]];
moveEvent.m_y[i] = s_oldY[index2Slots[i]];
moveEvent.m_pointerId[i] = index2Slots[i];
}
// 1. currently there're two fingers on touch screen
// but only one finger position information is reported in this loop
// 2. previously there're two fingers on toush screen
// but only one finger up information is reported in this loop
// adding another's information
if (2 == s_curPointerCount && 0 == curIndex
|| (MoveEvent::ACTION_POINTER_UP == moveAction && 0 == curIndex))
{
int anotherSlot = 1 - index2Slots[0];
moveEvent.m_x[1] = s_oldX[anotherSlot];
moveEvent.m_y[1] = s_oldY[anotherSlot];
moveEvent.m_pointerId[1] = anotherSlot;
moveEvent.m_pointerCount = 2;
}
moveEvent.m_actionIndex = curActionIndex;
moveEvent.m_eventTime = SystemUtil::GetUpdateTimeInMs();
for (int i = 0; i < 2; ++i)
{
DebugPrintf(DLC_GESTURE, "Slot %d: (%d, %d)", i, s_oldX[i], s_oldY[i]);
}
DebugPrintf(DLC_GESTURE, "Read move event %d: (%d, %d), pointer count: %d, action index: %d",
moveEvent.GetActionMasked(),
moveEvent.GetX(),
moveEvent.GetY(),
moveEvent.GetPointerCount(),
moveEvent.GetActionIndex());
return moveEvent.Clone();
}
