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gestures: prevent deciding on a direction too eary

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Doing that breaks when the input device has a very high resolution, which
is the case with touchscreens for example. The minimum delta of 5 is an
arbitrarily chosen value that can be changed if needed
This commit is contained in:
Xaver Hugl 2022-04-02 03:53:16 +02:00
parent cba443dbe3
commit a4919786c6
1 changed files with 12 additions and 14 deletions
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26
src/gestures.cpp
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@ -199,30 +199,28 @@ void GestureRecognizer::updateSwipeGesture(const QSizeF &delta)
m_currentDelta += delta;
SwipeGesture::Direction direction; // Overall direction
Axis swipeAxis;
// Pick an axis for gestures so horizontal ones don't change to vertical ones without lifting fingers
if (m_currentSwipeAxis == Axis::None) {
if (std::abs(m_currentDelta.width()) >= std::abs(m_currentDelta.height())) {
// horizontal
swipeAxis = Axis::Horizontal;
direction = m_currentDelta.width() < 0 ? SwipeGesture::Direction::Left : SwipeGesture::Direction::Right;
} else if (std::abs(m_currentDelta.width()) < std::abs(m_currentDelta.height())) {
// vertical
} else {
swipeAxis = Axis::Vertical;
direction = m_currentDelta.height() < 0 ? SwipeGesture::Direction::Up : SwipeGesture::Direction::Down;
}
switch (direction) {
case SwipeGesture::Direction::Up:
case SwipeGesture::Direction::Down:
m_currentSwipeAxis = Axis::Vertical;
break;
case SwipeGesture::Direction::Left:
case SwipeGesture::Direction::Right:
m_currentSwipeAxis = Axis::Horizontal;
break;
if (std::abs(m_currentDelta.width()) >= 5 || std::abs(m_currentDelta.height()) >= 5) {
// only lock in a direction if the delta is big enough
// to prevent accidentally choosing the wrong direction
m_currentSwipeAxis = swipeAxis;
}
} else {
swipeAxis = m_currentSwipeAxis;
}
// Find the current swipe direction
switch (m_currentSwipeAxis) {
switch (swipeAxis) {
case Axis::Vertical:
direction = m_currentDelta.height() < 0 ? SwipeGesture::Direction::Up : SwipeGesture::Direction::Down;
break;
@ -230,7 +228,7 @@ void GestureRecognizer::updateSwipeGesture(const QSizeF &delta)
direction = m_currentDelta.width() < 0 ? SwipeGesture::Direction::Left : SwipeGesture::Direction::Right;
break;
default:
return;
Q_UNREACHABLE();
}
// Eliminate wrong gestures (takes two iterations)