void QtViewportHandler::zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea)
{
// This can only happen as a result of a user interaction.
ASSERT(m_hadUserInteraction);
if (!targetArea.isValid())
return;
if (m_suspendCount)
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_viewportItem->boundingRect();
qreal targetCSSScale = viewportRect.size().width() / endArea.size().width();
qreal endCSSScale = innerBoundedCSSScale(qMin(targetCSSScale, qreal(2.5)));
qreal endItemScale = itemScaleFromCSS(endCSSScale);
qreal currentScale = m_pageItem->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(), itemCoordFromCSS(touchPoint.y()));
const QPointF viewportHotspot = viewportRect.center();
QPointF endPosition = hotspot * endCSSScale - viewportHotspot;
QRectF endPosRange = computePosRangeForPageItemAtScale(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_viewportItem->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_viewportItem->contentPos().x()));
m_zoomOutScale = endItemScale;
break;
case ZoomBack: {
ScaleStackItem lastScale = m_scaleStack.takeLast();
endItemScale = lastScale.scale;
endCSSScale = cssScaleFromItem(lastScale.scale);
// Recalculate endPosition and bound it according to new scale.
endPosition.setY(hotspot.y() * endCSSScale - viewportHotspot.y());
endPosition.setX(lastScale.xPosition);
endPosRange = computePosRangeForPageItemAtScale(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;
}
animatePageItemRectVisible(endVisibleContentRect);
}
void PageViewportControllerClientQt::zoomToAreaGestureEnded(const QPointF& touchPoint, const QRectF& targetArea)
{
// This can only happen as a result of a user interaction.
ASSERT(m_controller->hadUserInteraction());
if (!targetArea.isValid())
return;
if (m_scrollChange.inProgress() || m_scaleChange.inProgress())
return;
const float margin = 10; // We want at least a little bit of margin.
QRectF endArea = targetArea.adjusted(-margin, -margin, margin, margin);
const QRectF viewportRect = m_viewportItem->boundingRect();
qreal minViewportScale = qreal(2.5);
qreal targetScale = viewportRect.size().width() / endArea.size().width();
targetScale = m_controller->innerBoundedViewportScale(qMin(minViewportScale, targetScale));
qreal currentScale = m_pageItem->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());
const QPointF viewportHotspot = viewportRect.center();
QPointF endPosition = hotspot - viewportHotspot / targetScale;
endPosition = m_controller->clampViewportToContents(endPosition, targetScale);
QRectF endVisibleContentRect(endPosition, viewportRect.size() / targetScale);
enum { ZoomIn, ZoomBack, ZoomOut, NoZoom } zoomAction = ZoomIn;
// 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 (!m_scaleStack.isEmpty() && fuzzyCompare(targetScale, 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_viewportItem->mapRectToWebContent(viewportRect));
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(targetScale, m_zoomOutScale, 0.01))
zoomAction = ZoomBack;
else if (targetScale < currentScale)
zoomAction = ZoomOut;
switch (zoomAction) {
case ZoomIn:
m_scaleStack.append(ScaleStackItem(currentScale, m_viewportItem->contentPos().x() / currentScale));
m_zoomOutScale = targetScale;
break;
case ZoomBack: {
if (m_scaleStack.isEmpty()) {
targetScale = m_controller->minimumContentsScale();
endPosition.setY(hotspot.y() - viewportHotspot.y() / targetScale);
endPosition.setX(0);
m_zoomOutScale = 0;
} else {
ScaleStackItem lastScale = m_scaleStack.takeLast();
targetScale = lastScale.scale;
// Recalculate endPosition and clamp it according to the new scale.
endPosition.setY(hotspot.y() - viewportHotspot.y() / targetScale);
endPosition.setX(lastScale.xPosition);
}
endPosition = m_controller->clampViewportToContents(endPosition, targetScale);
endVisibleContentRect = QRectF(endPosition, viewportRect.size() / targetScale);
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 >= targetScale)
m_scaleStack.removeLast();
m_zoomOutScale = targetScale;
break;
case NoZoom:
break;
}
animateContentRectVisible(endVisibleContentRect);
}
