void QtViewportInteractionEngine::wheelEvent(QWheelEvent* ev)
{
if (scrollAnimationActive() || scaleAnimationActive() || pinchGestureActive())
return; // Ignore.
// A normal scroll-tick should have a delta of 120 (1/8) degrees. Convert this to
// local standard scroll step of 3 lines of 20 pixels.
static const int cDefaultQtScrollStep = 20;
static const int wheelScrollLines = 3;
const int wheelTick = wheelScrollLines * cDefaultQtScrollStep;
int pixelDelta = ev->delta() * (wheelTick / 120.f);
QPointF newPosition = m_viewport->contentPos();
if (ev->orientation() == Qt::Horizontal)
newPosition.rx() -= pixelDelta;
else
newPosition.ry() -= pixelDelta;
QRectF endPosRange = computePosRangeForItemAtScale(m_content->contentsScale());
QPointF currentPosition = m_viewport->contentPos();
newPosition = boundPosition(endPosRange.topLeft(), newPosition, endPosRange.bottomRight());
m_viewport->setContentPos(newPosition);
emit contentViewportChanged(currentPosition - newPosition);
}
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);
}
void QtViewportInteractionEngine::zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea)
{
if (!targetArea.isValid())
return;
if (scrollAnimationActive() || scaleAnimationActive())
return;
const int margin = 10; // We want at least a little bit or margin.
QRectF endArea = itemRectFromCSS(targetArea.adjusted(-margin, -margin, margin, margin));
const QRectF viewportRect = m_viewport->boundingRect();
qreal targetCSSScale = cssScaleFromItem(viewportRect.size().width() / endArea.size().width());
qreal endItemScale = itemScaleFromCSS(innerBoundedCSSScale(qMin(targetCSSScale, qreal(2.5))));
// We want to end up with the target area filling the whole width of the viewport (if possible),
// and centralized vertically where the user requested zoom. Thus our hotspot is the center of
// the targetArea x-wise and the requested zoom position, y-wise.
const QPointF hotspot = QPointF(endArea.center().x(), touchPoint.y() * m_constraints.devicePixelRatio);
const QPointF viewportHotspot = viewportRect.center();
QPointF endPosition = hotspot * endItemScale - viewportHotspot;
QRectF endPosRange = computePosRangeForItemAtScale(endItemScale);
endPosition = boundPosition(endPosRange.topLeft(), endPosition, endPosRange.bottomRight());
QRectF endVisibleContentRect(endPosition / endItemScale, viewportRect.size() / endItemScale);
animateItemRectVisible(endVisibleContentRect);
}
void QtViewportInteractionEngine::wheelEvent(QWheelEvent* ev)
{
if (scrollAnimationActive() || scaleAnimationActive() || pinchGestureActive())
return; // Ignore.
int delta = ev->delta();
// A delta that is not mod 120 indicates a device that is sending
// fine-resolution scroll events, so use the delta as number of wheel ticks
// and number of pixels to scroll. See also webkit.org/b/29601
bool fullTick = !(delta % 120);
static const int cDefaultQtScrollStep = 20;
static const int wheelScrollLines = 3;
int scrollLines = (fullTick) ? wheelScrollLines * cDefaultQtScrollStep : 1;
delta = (fullTick) ? delta / 120.0f : delta;
delta *= scrollLines;
QPointF newPosition = m_viewport->contentPos();
if (ev->orientation() == Qt::Horizontal)
newPosition.rx() += delta;
else
newPosition.ry() += delta;
QRectF endPosRange = computePosRangeForItemAtScale(m_content->contentsScale());
QPointF currentPosition = m_viewport->contentPos();
newPosition = boundPosition(endPosRange.topLeft(), newPosition, endPosRange.bottomRight());
m_viewport->setContentPos(newPosition);
emit contentViewportChanged(currentPosition - newPosition);
}
void QtViewportHandler::scaleAnimationValueChanged(QVariant value)
{
// Resetting the end value, the easing curve or the duration of the scale animation
// triggers a recalculation of the animation interval. This might change the current
// value of the animated property.
// Make sure we only act on animation value changes if the animation is active.
if (!scaleAnimationActive())
return;
setPageItemRectVisible(value.toRectF());
}
void QtViewportInteractionEngine::zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea)
{
if (!targetArea.isValid())
return;
if (scrollAnimationActive() || scaleAnimationActive())
return;
const int margin = 10; // We want at least a little bit of margin.
QRectF endArea = itemRectFromCSS(targetArea.adjusted(-margin, -margin, margin, margin));
const QRectF viewportRect = m_viewport->boundingRect();
qreal targetCSSScale = cssScaleFromItem(viewportRect.size().width() / endArea.size().width());
qreal endItemScale = itemScaleFromCSS(innerBoundedCSSScale(qMin(targetCSSScale, qreal(2.5))));
qreal currentScale = m_content->contentsScale();
// We want to end up with the target area filling the whole width of the viewport (if possible),
// and centralized vertically where the user requested zoom. Thus our hotspot is the center of
// the targetArea x-wise and the requested zoom position, y-wise.
const QPointF hotspot = QPointF(endArea.center().x(), touchPoint.y() * m_devicePixelRatio);
const QPointF viewportHotspot = viewportRect.center();
QPointF endPosition = hotspot * endItemScale - viewportHotspot;
QRectF endPosRange = computePosRangeForItemAtScale(endItemScale);
endPosition = boundPosition(endPosRange.topLeft(), endPosition, endPosRange.bottomRight());
QRectF endVisibleContentRect(endPosition / endItemScale, viewportRect.size() / endItemScale);
enum { ZoomIn, ZoomBack, ZoomOut, NoZoom } zoomAction = ZoomIn;
if (!m_scaleStack.isEmpty()) {
// Zoom back out if attempting to scale to the same current scale, or
// attempting to continue scaling out from the inner most level.
// Use fuzzy compare with a fixed error to be able to deal with largish differences due to pixel rounding.
if (fuzzyCompare(endItemScale, currentScale, 0.01)) {
// If moving the viewport would expose more of the targetRect and move at least 40 pixels, update position but do not scale out.
QRectF currentContentRect(m_viewport->contentPos() / currentScale, viewportRect.size() / currentScale);
QRectF targetIntersection = endVisibleContentRect.intersected(targetArea);
if (!currentContentRect.contains(targetIntersection) && (qAbs(endVisibleContentRect.top() - currentContentRect.top()) >= 40 || qAbs(endVisibleContentRect.left() - currentContentRect.left()) >= 40))
zoomAction = NoZoom;
else
zoomAction = ZoomBack;
} else if (fuzzyCompare(endItemScale, m_zoomOutScale, 0.01))
zoomAction = ZoomBack;
else if (endItemScale < currentScale)
zoomAction = ZoomOut;
}
switch (zoomAction) {
case ZoomIn:
m_scaleStack.append(ScaleStackItem(currentScale, m_viewport->contentPos().x()));
m_zoomOutScale = endItemScale;
break;
case ZoomBack: {
ScaleStackItem lastScale = m_scaleStack.takeLast();
endItemScale = lastScale.scale;
// Recalculate endPosition and bound it according to new scale.
endPosition.setY(hotspot.y() * endItemScale - viewportHotspot.y());
endPosition.setX(lastScale.xPosition);
endPosRange = computePosRangeForItemAtScale(endItemScale);
endPosition = boundPosition(endPosRange.topLeft(), endPosition, endPosRange.bottomRight());
endVisibleContentRect = QRectF(endPosition / endItemScale, viewportRect.size() / endItemScale);
break;
}
case ZoomOut:
// Unstack all scale-levels deeper than the new level, so a zoom-back won't end up zooming in.
while (!m_scaleStack.isEmpty() && m_scaleStack.last().scale >= endItemScale)
m_scaleStack.removeLast();
m_zoomOutScale = endItemScale;
break;
case NoZoom:
break;
}
animateItemRectVisible(endVisibleContentRect);
}