void GestureEventListener::SetState(GestureState aState)
{
mState = aState;
if (mState == GESTURE_NONE) {
mSpanChange = 0.0f;
mPreviousSpan = 0.0f;
} else if (mState == GESTURE_MULTI_TOUCH_DOWN) {
mPreviousSpan = GetCurrentSpan(mLastTouchInput);
}
}
nsEventStatus GestureEventListener::HandleInputTouchMove()
{
nsEventStatus rv = nsEventStatus_eIgnore;
switch (mState) {
case GESTURE_NONE:
// Ignore this input signal as the corresponding events get handled by APZC
break;
case GESTURE_LONG_TOUCH_DOWN:
if (MoveDistanceIsLarge()) {
// So that we don't fire a long-tap-up if the user moves around after a
// long-tap
SetState(GESTURE_NONE);
}
break;
case GESTURE_FIRST_SINGLE_TOUCH_DOWN:
case GESTURE_FIRST_SINGLE_TOUCH_MAX_TAP_DOWN:
case GESTURE_SECOND_SINGLE_TOUCH_DOWN: {
// If we move too much, bail out of the tap.
if (MoveDistanceIsLarge()) {
CancelLongTapTimeoutTask();
CancelMaxTapTimeoutTask();
SetState(GESTURE_NONE);
}
break;
}
case GESTURE_MULTI_TOUCH_DOWN: {
if (mLastTouchInput.mTouches.Length() < 2) {
NS_WARNING("Wrong input: less than 2 moving points in GESTURE_MULTI_TOUCH_DOWN state");
break;
}
float currentSpan = GetCurrentSpan(mLastTouchInput);
mSpanChange += fabsf(currentSpan - mPreviousSpan);
if (mSpanChange > PINCH_START_THRESHOLD) {
SetState(GESTURE_PINCH);
PinchGestureInput pinchEvent(PinchGestureInput::PINCHGESTURE_START,
mLastTouchInput.mTime,
mLastTouchInput.mTimeStamp,
GetCurrentFocus(mLastTouchInput),
currentSpan,
currentSpan,
mLastTouchInput.modifiers);
rv = mAsyncPanZoomController->HandleGestureEvent(pinchEvent);
} else {
// Prevent APZC::OnTouchMove from processing a move event when two
// touches are active
rv = nsEventStatus_eConsumeNoDefault;
}
mPreviousSpan = currentSpan;
break;
}
case GESTURE_PINCH: {
if (mLastTouchInput.mTouches.Length() < 2) {
NS_WARNING("Wrong input: less than 2 moving points in GESTURE_PINCH state");
// Prevent APZC::OnTouchMove() from handling this wrong input
rv = nsEventStatus_eConsumeNoDefault;
break;
}
float currentSpan = GetCurrentSpan(mLastTouchInput);
PinchGestureInput pinchEvent(PinchGestureInput::PINCHGESTURE_SCALE,
mLastTouchInput.mTime,
mLastTouchInput.mTimeStamp,
GetCurrentFocus(mLastTouchInput),
currentSpan,
mPreviousSpan,
mLastTouchInput.modifiers);
rv = mAsyncPanZoomController->HandleGestureEvent(pinchEvent);
mPreviousSpan = currentSpan;
break;
}
default:
NS_WARNING("Unhandled state upon touch move");
SetState(GESTURE_NONE);
break;
}
return rv;
}
nsEventStatus GestureEventListener::HandleInputTouchMove()
{
nsEventStatus rv = nsEventStatus_eIgnore;
switch (mState) {
case GESTURE_NONE:
case GESTURE_LONG_TOUCH_DOWN:
// Ignore this input signal as the corresponding events get handled by APZC
break;
case GESTURE_FIRST_SINGLE_TOUCH_DOWN:
case GESTURE_FIRST_SINGLE_TOUCH_MAX_TAP_DOWN:
case GESTURE_SECOND_SINGLE_TOUCH_DOWN: {
// If we move too much, bail out of the tap.
ScreenIntPoint delta = mLastTouchInput.mTouches[0].mScreenPoint - mTouchStartPosition;
if (NS_hypot(delta.x, delta.y) > AsyncPanZoomController::GetTouchStartTolerance()) {
CancelLongTapTimeoutTask();
CancelMaxTapTimeoutTask();
SetState(GESTURE_NONE);
}
break;
}
case GESTURE_MULTI_TOUCH_DOWN: {
if (mLastTouchInput.mTouches.Length() < 2) {
NS_WARNING("Wrong input: less than 2 moving points in GESTURE_MULTI_TOUCH_DOWN state");
break;
}
float currentSpan = GetCurrentSpan(mLastTouchInput);
mSpanChange += fabsf(currentSpan - mPreviousSpan);
if (mSpanChange > PINCH_START_THRESHOLD) {
SetState(GESTURE_PINCH);
PinchGestureInput pinchEvent(PinchGestureInput::PINCHGESTURE_START,
mLastTouchInput.mTime,
GetCurrentFocus(mLastTouchInput),
currentSpan,
currentSpan,
mLastTouchInput.modifiers);
mAsyncPanZoomController->HandleGestureEvent(pinchEvent);
}
rv = nsEventStatus_eConsumeNoDefault;
mPreviousSpan = currentSpan;
break;
}
case GESTURE_PINCH: {
if (mLastTouchInput.mTouches.Length() < 2) {
NS_WARNING("Wrong input: less than 2 moving points in GESTURE_PINCH state");
// Prevent APZC::OnTouchMove() from handling this wrong input
rv = nsEventStatus_eConsumeNoDefault;
break;
}
float currentSpan = GetCurrentSpan(mLastTouchInput);
PinchGestureInput pinchEvent(PinchGestureInput::PINCHGESTURE_SCALE,
mLastTouchInput.mTime,
GetCurrentFocus(mLastTouchInput),
currentSpan,
mPreviousSpan,
mLastTouchInput.modifiers);
mAsyncPanZoomController->HandleGestureEvent(pinchEvent);
rv = nsEventStatus_eConsumeNoDefault;
mPreviousSpan = currentSpan;
break;
}
default:
NS_WARNING("Unhandled state upon touch move");
SetState(GESTURE_NONE);
break;
}
return rv;
}