I found this as well. I think browser implementation of these old single
touch events isn't great. I switched to using the multi touch versions.
Something like this:
private HashMap<Integer, Touch> touches;
private void handleScreenTouches(JsArray<Touch> newTouches, boolean
touchDown) {
// Update the touch collection
for (int i=0; i<newTouches.length(); i++) {
Touch touch = newTouches.get(i);
if (touch != null) {
if (touchDown) {
touches.put(touch.getIdentifier(), touch);
}
else {
touches.remove(touch.getIdentifier());
}
}
}
// Look through the remaining touches
for (Touch touch : touches.values()) {
...
}
}
drawingPaper.addDomHandler(event -> {
handleScreenTouches(event.getChangedTouches(), true);
}, TouchStartEvent.getType()));
drawingPaper.addDomHandler(event -> {
handleScreenTouches(event.getChangedTouches(), true);
}, TouchMoveEvent.getType()));
drawingPaper.addDomHandler(event -> {
handleScreenTouches(event.getChangedTouches(), false);
}, TouchEndEvent.getType()));
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