com.sun.glass.ui.monocle.LinuxStatefulMultiTouchProcessor Maven / Gradle / Ivy
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.glass.ui.monocle;
import java.util.HashMap;
import java.util.Map;
/**
* This multitouch processor works with drivers that send tracking IDs.
*/
class LinuxStatefulMultiTouchProcessor extends LinuxTouchProcessor {
private static final int ID_UNASSIGNED = -1;
private static final int COORD_UNDEFINED = Integer.MIN_VALUE;
private int currentID = ID_UNASSIGNED;
private int currentSlot = 0;
private final Map slotToIDMap = new HashMap<>();
LinuxStatefulMultiTouchProcessor(LinuxInputDevice device) {
super(device);
pipeline.addFilter(new LookaheadTouchFilter(false));
}
@Override
public void processEvents(LinuxInputDevice device) {
LinuxEventBuffer buffer = device.getBuffer();
int x = COORD_UNDEFINED;
int y = COORD_UNDEFINED;
// Some devices send EV_KEY BTN_TOUCH 0 to notify that all
// touch points are released.
boolean allPointsReleased = false;
while (buffer.hasNextEvent()) {
switch (buffer.getEventType()) {
case LinuxInput.EV_ABS: {
int value = transform.getValue(buffer);
switch (transform.getAxis(buffer)) {
case LinuxInput.ABS_MT_SLOT:
// If we received coordinates already, assign them
// to the current slot.
if (currentID != ID_UNASSIGNED
&& (x != COORD_UNDEFINED || y != COORD_UNDEFINED)) {
updatePoint(x, y);
x = y = COORD_UNDEFINED;
}
// We expect ABS_MT_SLOT and ABS_MT_TRACKING_ID
// to precede the coordinates they describe
currentSlot = value;
currentID = slotToIDMap.getOrDefault(currentSlot,
ID_UNASSIGNED);
break;
case LinuxInput.ABS_MT_TRACKING_ID:
if (value == ID_UNASSIGNED && currentID != ID_UNASSIGNED) {
state.removePointForID(currentID);
}
currentID = value;
if (currentID == ID_UNASSIGNED) {
slotToIDMap.remove(currentSlot);
} else {
slotToIDMap.put(currentSlot, currentID);
}
break;
case LinuxInput.ABS_X:
case LinuxInput.ABS_MT_POSITION_X:
if (x == COORD_UNDEFINED) {
x = value;
}
break;
case LinuxInput.ABS_Y:
case LinuxInput.ABS_MT_POSITION_Y:
if (y == COORD_UNDEFINED) {
y = value;
}
break;
}
break;
}
case LinuxInput.EV_KEY:
switch (buffer.getEventCode()) {
case LinuxInput.BTN_TOUCH:
if (buffer.getEventValue() == 0) {
allPointsReleased = true;
}
break;
}
break;
case LinuxInput.EV_SYN:
switch (buffer.getEventCode()) {
case LinuxInput.SYN_MT_REPORT: {
if (currentID != ID_UNASSIGNED) {
if (x == COORD_UNDEFINED
&& y == COORD_UNDEFINED) {
state.removePointForID(currentID);
currentID = ID_UNASSIGNED;
} else {
updatePoint(x, y);
}
}
x = y = COORD_UNDEFINED;
break;
}
case LinuxInput.SYN_REPORT:
if ((x != COORD_UNDEFINED || y != COORD_UNDEFINED)
&& currentID != ID_UNASSIGNED) {
// we received coordinates,
// but no SYN_MT_REPORT event. Assign these
// coordinates to the current ID.
updatePoint(x, y);
} else if (allPointsReleased) {
state.clear();
}
pipeline.pushState(state);
x = y = COORD_UNDEFINED;
allPointsReleased = false;
break;
default: // ignore
}
break;
}
buffer.nextEvent();
}
pipeline.flush();
}
private void updatePoint(int x, int y) {
TouchState.Point p = state
.getPointForID(currentID);
if (p == null) {
p = new TouchState.Point();
p.id = currentID;
p = state.addPoint(p);
}
if (x != COORD_UNDEFINED) {
p.x = x;
}
if (y != COORD_UNDEFINED) {
p.y = y;
}
}
}