bool QtViewportInteractionEngine::ensureContentWithinViewportBoundary(bool immediate)
{
ASSERT(m_suspendCount);
if (scrollAnimationActive() || scaleAnimationActive())
return false;
qreal endItemScale = itemScaleFromCSS(innerBoundedCSSScale(currentCSSScale()));
const QRectF viewportRect = m_viewport->boundingRect();
QPointF viewportHotspot = viewportRect.center();
QPointF endPosition = m_viewport->mapToWebContent(viewportHotspot) * endItemScale - viewportHotspot;
QRectF endPosRange = computePosRangeForItemAtScale(endItemScale);
endPosition = boundPosition(endPosRange.topLeft(), endPosition, endPosRange.bottomRight());
QRectF endVisibleContentRect(endPosition / endItemScale, viewportRect.size() / endItemScale);
if (immediate) {
setItemRectVisible(endVisibleContentRect);
return true;
}
return !animateItemRectVisible(endVisibleContentRect);
}
/*
* This is called for all changes of item scale, width or height.
* This is called when interacting, ie. during for instance pinch-zooming.
*
* FIXME: This is currently called twice if you concurrently change width and height.
*/
void QtViewportInteractionEngine::itemSizeChanged()
{
if (m_suspendCount)
return;
setItemRectVisible(nearestValidBounds());
}
void QtViewportInteractionEngine::animateItemRectVisible(const QRectF& itemRect)
{
ASSERT(m_scaleAnimation->state() == QAbstractAnimation::Stopped);
ASSERT(!scrollAnimationActive());
if (scrollAnimationActive())
return;
QRectF currentItemRectVisible = m_viewport->mapRectToWebContent(m_viewport->boundingRect());
if (itemRect == currentItemRectVisible)
return;
// FIXME: Investigate why that animation doesn't run when we are unfocused.
if (!m_viewport->isVisible() || !m_viewport->hasFocus()) {
// Apply the end result immediately when we are non-visible.
setItemRectVisible(itemRect);
return;
}
QEasingCurve easingCurve;
easingCurve.setCustomType(physicalOvershoot);
m_scaleAnimation->setDuration(kScaleAnimationDurationMillis);
m_scaleAnimation->setEasingCurve(easingCurve);
m_scaleAnimation->setStartValue(currentItemRectVisible);
m_scaleAnimation->setEndValue(itemRect);
m_scaleAnimation->start();
}
void QtViewportInteractionEngine::cancelScrollAnimation()
{
if (!scrollAnimationActive())
return;
// 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();
setItemRectVisible(nearestValidBounds());
}
void QtViewportInteractionEngine::pagePositionRequest(const QPoint& pagePosition)
{
// Ignore the request if suspended. Can only happen due to delay in event delivery.
if (m_suspendCount)
return;
qreal endItemScale = m_content->contentsScale(); // Stay at same scale.
QRectF endPosRange = computePosRangeForItemAtScale(endItemScale);
QPointF endPosition = boundPosition(endPosRange.topLeft(), pagePosition * endItemScale, endPosRange.bottomRight());
QRectF endVisibleContentRect(endPosition / endItemScale, m_viewport->boundingRect().size() / endItemScale);
setItemRectVisible(endVisibleContentRect);
}
bool QtViewportInteractionEngine::animateItemRectVisible(const QRectF& itemRect)
{
QRectF currentItemRectVisible = m_viewport->mapRectToWebContent(m_viewport->boundingRect());
if (itemRect == currentItemRectVisible)
return false;
// FIXME: Investigate why that animation doesn't run when we are unfocused.
if (!m_viewport->isVisible() || !m_viewport->hasFocus()) {
// Apply the end result immediately when we are non-visible.
setItemRectVisible(itemRect);
return true;
}
m_scaleAnimation->setDuration(kScaleAnimationDurationMillis);
m_scaleAnimation->setEasingCurve(QEasingCurve::OutCubic);
m_scaleAnimation->setStartValue(currentItemRectVisible);
m_scaleAnimation->setEndValue(itemRect);
m_scaleAnimation->start();
return true;
}
