void QtViewportInteractionEngine::itemSizeChanged()
{
// FIXME: This needs to be done smarter. What happens if it resizes when we were interacting?
if (m_suspendCount)
return;
ViewportUpdateDeferrer guard(this);
ensureContentWithinViewportBoundary(true);
}
void QtViewportInteractionEngine::cancelScrollAnimation()
{
ViewportUpdateDeferrer guard(this);
// If the pan gesture recognizer receives a touch begin event
// during an ongoing kinetic scroll animation of a previous
// pan gesture, the animation is stopped and the content is
// immediately positioned back to valid boundaries.
m_viewport->cancelFlick();
ensureContentWithinViewportBoundary(/*immediate*/ true);
}
void QtViewportInteractionEngine::pinchGestureEnded()
{
ASSERT(m_suspendCount);
if (!m_allowsUserScaling)
return;
m_pinchStartScale = -1;
// Clear the update deferrer now if we're in our final position and there won't be any animation to clear it later.
if (ensureContentWithinViewportBoundary())
m_scaleUpdateDeferrer.clear();
}
void QtViewportInteractionEngine::applyConstraints(const Constraints& constraints)
{
// We always have to apply the constrains even if they didn't change, as
// the initial scale might need to be applied.
ViewportUpdateDeferrer guard(this);
m_constraints = constraints;
if (!m_hadUserInteraction) {
qreal initialScale = innerBoundedCSSScale(m_constraints.initialScale);
m_content->setContentsScale(itemScaleFromCSS(initialScale));
}
// If the web app changes successively changes the viewport on purpose
// it wants to be in control and we should disable animations.
ensureContentWithinViewportBoundary(/* immediate */ true);
}
