synchronized boolean handleTouchEvent(MotionEvent event, boolean isOnTouchEvent) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// remember page we started on...
lastPageIndex = getPageIndexFromAngle(accumulatedAngle);
lastPosition = orientationVertical ? event.getY() : event.getX();
return isOnTouchEvent;
case MotionEvent.ACTION_MOVE:
float delta =
orientationVertical ? (lastPosition - event.getY()) : (lastPosition - event.getX());
if (Math.abs(delta) > controller.getTouchSlop()) {
setState(STATE_TOUCH);
forward = delta > 0;
}
if (state == STATE_TOUCH) {
if (Math.abs(delta) > minMovement) // ignore small movements
forward = delta > 0;
controller.showFlipAnimation();
float angleDelta;
if (orientationVertical)
angleDelta = 180 * delta / controller.getContentHeight() * movementRate;
else angleDelta = 180 * delta / controller.getContentWidth() * movementRate;
if (Math.abs(angleDelta) > maxTouchMoveAngle) // prevent
// large
// delta
// when
// moving
// too fast
angleDelta = Math.signum(angleDelta) * maxTouchMoveAngle;
// do not flip more than one page with one touch...
if (Math.abs(getPageIndexFromAngle(accumulatedAngle + angleDelta) - lastPageIndex) <= 1) {
accumulatedAngle += angleDelta;
}
// Bounce the page for the first and the last page
if (frontCards.getIndex() == maxIndex - 1) { // the last page
if (accumulatedAngle > frontCards.getIndex() * 180 + maxTipAngle)
accumulatedAngle = frontCards.getIndex() * 180 + maxTipAngle;
} else if (accumulatedAngle < -maxTipAngle) accumulatedAngle = -maxTipAngle;
int anglePageIndex = getPageIndexFromAngle(accumulatedAngle);
if (accumulatedAngle >= 0) {
if (anglePageIndex != frontCards.getIndex()) {
if (anglePageIndex == frontCards.getIndex() - 1) { // moved
// to
// previous
// page
swapCards(); // frontCards becomes the backCards
frontCards.resetWithIndex(backCards.getIndex() - 1);
controller.flippedToView(anglePageIndex, false);
} else if (anglePageIndex == frontCards.getIndex() + 1) { // moved
// to
// next
// page
swapCards();
backCards.resetWithIndex(frontCards.getIndex() + 1);
controller.flippedToView(anglePageIndex, false);
} else
throw new RuntimeException(
String.format(
"Inconsistent states: anglePageIndex: %d, accumulatedAngle %.1f, frontCards %d, backCards %d",
anglePageIndex,
accumulatedAngle,
frontCards.getIndex(),
backCards.getIndex()));
}
}
lastPosition = orientationVertical ? event.getY() : event.getX();
controller.getSurfaceView().requestRender();
return true;
}
return isOnTouchEvent;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
if (state == STATE_TOUCH) {
if (accumulatedAngle < 0) forward = true;
else if (accumulatedAngle > frontCards.getIndex() * 180
&& frontCards.getIndex() == maxIndex - 1) forward = false;
setState(STATE_AUTO_ROTATE);
controller.getSurfaceView().requestRender();
}
return isOnTouchEvent;
}
return false;
}
