package org.jboss.errai.ui.cordova.events.touch.longtap;
import java.util.ArrayList;
import java.util.List;
import org.jboss.errai.ui.cordova.events.touch.AbstractRecognizer;
import org.jboss.errai.ui.cordova.events.touch.GwtTimerExecutor;
import org.jboss.errai.ui.cordova.events.touch.TimerExecutor;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.dom.client.Touch;
import com.google.gwt.event.dom.client.TouchCancelEvent;
import com.google.gwt.event.dom.client.TouchEndEvent;
import com.google.gwt.event.dom.client.TouchMoveEvent;
import com.google.gwt.event.dom.client.TouchStartEvent;
import com.google.gwt.event.shared.HasHandlers;
import org.jboss.errai.ui.cordova.events.touch.TouchPoint;
/**
* @author edewit@redhat.com
*/
public class LongTapRecognizer extends AbstractRecognizer {
public static final int DEFAULT_WAIT_TIME_IN_MS = 1500;
public static final int DEFAULT_MAX_DISTANCE = 15;
private final HasHandlers source;
private State state = State.READY;
private TimerExecutor timerExecutor;
private final int numberOfFingers;
private List<TouchPoint> startPositions;
private int touchCount;
public LongTapRecognizer(HasHandlers source) {
this(source, new GwtTimerExecutor(), 1);
}
public LongTapRecognizer(HasHandlers source, int numberOfFingers) {
this(source, new GwtTimerExecutor(), numberOfFingers);
}
protected LongTapRecognizer(HasHandlers source, TimerExecutor timerExecutor,
int numberOfFingers) {
this.source = source;
this.timerExecutor = timerExecutor;
this.numberOfFingers = numberOfFingers;
this.startPositions = new ArrayList<TouchPoint>();
}
@Override
public void onTouchStart(final TouchStartEvent event) {
JsArray<Touch> touches = event.getTouches();
touchCount++;
switch (state) {
case INVALID:
break;
case READY:
startPositions.add(new TouchPoint(touches.get(touchCount - 1)));
state = State.FINGERS_DOWN;
break;
case FINGERS_DOWN:
startPositions.add(new TouchPoint(touches.get(touchCount - 1)));
break;
case FINGERS_UP:
default:
state = State.INVALID;
break;
}
if (touchCount == numberOfFingers) {
state = State.WAITING;
timerExecutor.execute(new TimerExecutor.CodeToRun() {
@Override
public void onExecution() {
if (state != State.WAITING) {
// something else happened forget it
return;
}
source.fireEvent(new LongTapEvent(source, numberOfFingers,
DEFAULT_WAIT_TIME_IN_MS, startPositions));
reset();
}
}, DEFAULT_WAIT_TIME_IN_MS);
}
if (touchCount > numberOfFingers) {
state = State.INVALID;
}
}
@Override
public void onTouchMove(TouchMoveEvent event) {
switch (state) {
case WAITING:
case FINGERS_DOWN:
case FINGERS_UP:
// compare positions
JsArray<Touch> currentTouches = event.getTouches();
for (int i = 0; i < currentTouches.length(); i++) {
Touch currentTouch = currentTouches.get(i);
for (TouchPoint startTouch : startPositions) {
if (currentTouch.getIdentifier() == startTouch.getId()) {
if (Math.abs(currentTouch.getPageX() - startTouch.getX()) > DEFAULT_MAX_DISTANCE
|| Math.abs(currentTouch.getPageY() - startTouch.getY()) > DEFAULT_MAX_DISTANCE) {
state = State.INVALID;
break;
}
}
if (state == State.INVALID) {
break;
}
}
}
break;
default:
state = State.INVALID;
break;
}
}
@Override
public void onTouchEnd(TouchEndEvent event) {
int currentTouches = event.getTouches().length();
switch (state) {
case WAITING:
state = State.INVALID;
break;
case FINGERS_DOWN:
state = State.FINGERS_UP;
break;
case FINGERS_UP:
// are we ready?
if (currentTouches == 0 && touchCount == numberOfFingers) {
// fire and reset
reset();
}
break;
case INVALID:
default:
if (currentTouches == 0)
reset();
break;
}
}
@Override
public void onTouchCancel(TouchCancelEvent event) {
state = State.INVALID;
int currentTouches = event.getTouches().length();
if (currentTouches == 0)
reset();
}
protected void reset() {
state = State.READY;
touchCount = 0;
}
}