private int getRailSlideOffset(TouchEvent event) {
int offset = event.getX() - lastX;
lastX = event.getX();
lastY = event.getY();
offset = adjustCalculatedOffsetToStayWithinBounds(offset);
return offset;
}
@Override
public void update(float portionOfSecond, List<TouchEvent> touchEvents) {
if (railState != RailState.LOCKED) {
if (railState == RailState.ADJUSTING) {
boolean doneAdjusting = true;
for (int i = 0; i < tilesToAdjust.length; i++) {
if (tilesToAdjust[i] && !letterTiles[i].progressTowardDesiredPosition(portionOfSecond)) {
doneAdjusting = false;
}
}
if (doneAdjusting) {
Arrays.fill(tilesToAdjust, false);
railState = targetRailStateAfterAdjustment;
}
}
if (railState == RailState.FLUNG) {
int offset = (int) (flingVelocity * portionOfSecond);
offset = adjustCalculatedOffsetToStayWithinBounds(offset);
updateTilesWithOffset(offset);
flingVelocity = flingVelocity * FLING_FRICTION;
if (flingVelocity < 5 && flingVelocity > -5) {
railState = RailState.RESTING;
}
}
timeSinceLastTouchEvent += portionOfSecond;
if (timeSinceLastTouchEvent > LONG_TOUCH_THRESHOLD
&& (railState == RailState.TOUCH_INITIATED || railState == RailState.SLIDING)) {
tryToPickUpLetter();
}
int lastTouchOffset = 0;
for (TouchEvent event : touchEvents) {
if (event.getType() == TouchEvent.TOUCH_DOWN
&& railState == RailState.RESTING
&& touchIsInsideRail(event)) {
railState = RailState.TOUCH_INITIATED;
lastX = event.getX();
lastY = event.getY();
timeSinceLastTouchEvent = 0;
}
if (event.getType() == TouchEvent.TOUCH_DRAGGED) {
if (railState == RailState.TOUCH_INITIATED || railState == RailState.SLIDING) {
if (railState != RailState.SLIDING) {
railState = RailState.SLIDING;
}
lastTouchOffset = getRailSlideOffset(event);
updateTilesWithOffset(lastTouchOffset);
}
// some devices register drags even if there is no change. Others don't register a drag
// without change
if (lastTouchOffset != 0) {
timeSinceLastTouchEvent = 0;
}
}
if (event.getType() == TouchEvent.TOUCH_UP) {
if (railState == RailState.SLIDING) {
// Generally an up is accompanied by a drag first. But what it if isn't?
if (lastTouchOffset == 0) {
lastTouchOffset = getRailSlideOffset(event);
}
if (lastTouchOffset != 0) {
railState = RailState.FLUNG;
updateTilesWithOffset(lastTouchOffset);
flingVelocity = lastTouchOffset / portionOfSecond;
} else {
railState = RailState.RESTING;
}
} else if (railState != RailState.LETTER_SELECTED && railState != RailState.ADJUSTING) {
railState = RailState.RESTING;
}
timeSinceLastTouchEvent = 0;
}
}
}
}
private boolean touchIsInsideRail(TouchEvent event) {
return event.getX() > sectionLeft
&& event.getX() < sectionLeft + sectionWidth
&& event.getY() > sectionTop + Assets.padding
&& event.getY() < sectionTop + sectionHeight - Assets.padding;
}