void AutoscrollController::updateDragAndDrop(Node* dropTargetNode,
const IntPoint& eventPosition,
double eventTime) {
if (!dropTargetNode || !dropTargetNode->layoutObject()) {
stopAutoscroll();
return;
}
if (m_autoscrollLayoutObject &&
m_autoscrollLayoutObject->frame() !=
dropTargetNode->layoutObject()->frame())
return;
dropTargetNode->layoutObject()
->frameView()
->updateAllLifecyclePhasesExceptPaint();
LayoutBox* scrollable =
LayoutBox::findAutoscrollable(dropTargetNode->layoutObject());
if (!scrollable) {
stopAutoscroll();
return;
}
Page* page = scrollable->frame() ? scrollable->frame()->page() : nullptr;
if (!page) {
stopAutoscroll();
return;
}
IntSize offset = scrollable->calculateAutoscrollDirection(eventPosition);
if (offset.isZero()) {
stopAutoscroll();
return;
}
m_dragAndDropAutoscrollReferencePosition = eventPosition + offset;
if (m_autoscrollType == NoAutoscroll) {
m_autoscrollType = AutoscrollForDragAndDrop;
m_autoscrollLayoutObject = scrollable;
m_dragAndDropAutoscrollStartTime = eventTime;
UseCounter::count(m_page->mainFrame(), UseCounter::DragAndDropScrollStart);
startAutoscroll();
} else if (m_autoscrollLayoutObject != scrollable) {
m_dragAndDropAutoscrollStartTime = eventTime;
m_autoscrollLayoutObject = scrollable;
}
}
void AutoscrollController::updateDragAndDrop(Node* dropTargetNode, const IntPoint& eventPosition, double eventTime)
{
if (!dropTargetNode || !dropTargetNode->renderer()) {
stopAutoscroll();
return;
}
if (m_autoscrollRenderer && m_autoscrollRenderer->frame() != dropTargetNode->renderer()->frame())
return;
RenderBox* scrollable = RenderBox::findAutoscrollable(dropTargetNode->renderer());
if (!scrollable) {
stopAutoscroll();
return;
}
Page* page = scrollable->frame() ? scrollable->frame()->page() : 0;
if (!page) {
stopAutoscroll();
return;
}
IntSize offset = scrollable->calculateAutoscrollDirection(eventPosition);
if (offset.isZero()) {
stopAutoscroll();
return;
}
m_dragAndDropAutoscrollReferencePosition = eventPosition + offset;
if (m_autoscrollType == NoAutoscroll) {
m_autoscrollType = AutoscrollForDragAndDrop;
m_autoscrollRenderer = scrollable;
m_dragAndDropAutoscrollStartTime = eventTime;
startAutoscroll();
} else if (m_autoscrollRenderer != scrollable) {
m_dragAndDropAutoscrollStartTime = eventTime;
m_autoscrollRenderer = scrollable;
}
}
// FIXME: This would get get better animation fidelity if it used the monotonicFrameBeginTime instead
// of WTF::currentTime().
void AutoscrollController::animate(double)
{
if (!m_autoscrollLayoutObject) {
stopAutoscroll();
return;
}
EventHandler& eventHandler = m_autoscrollLayoutObject->frame()->eventHandler();
switch (m_autoscrollType) {
case AutoscrollForDragAndDrop:
if (WTF::currentTime() - m_dragAndDropAutoscrollStartTime > autoscrollDelay)
m_autoscrollLayoutObject->autoscroll(m_dragAndDropAutoscrollReferencePosition);
break;
case AutoscrollForSelection:
if (!eventHandler.mousePressed()) {
stopAutoscroll();
return;
}
eventHandler.updateSelectionForMouseDrag();
m_autoscrollLayoutObject->autoscroll(eventHandler.lastKnownMousePosition());
break;
case NoAutoscroll:
break;
#if OS(WIN)
case AutoscrollForPanCanStop:
case AutoscrollForPan:
if (!panScrollInProgress()) {
stopAutoscroll();
return;
}
if (FrameView* view = m_autoscrollLayoutObject->frame()->view())
updatePanScrollState(view, eventHandler.lastKnownMousePosition());
m_autoscrollLayoutObject->panScroll(m_panScrollStartPos);
break;
#endif
}
if (m_autoscrollType != NoAutoscroll && m_autoscrollLayoutObject)
m_page->chromeClient().scheduleAnimation(m_autoscrollLayoutObject->frame()->view());
}
void AutoscrollController::handleMouseReleaseForPanScrolling(LocalFrame* frame, const PlatformMouseEvent& mouseEvent)
{
if (!frame->isMainFrame())
return;
switch (m_autoscrollType) {
case AutoscrollForPan:
if (mouseEvent.button() == MiddleButton)
m_autoscrollType = AutoscrollForPanCanStop;
break;
case AutoscrollForPanCanStop:
stopAutoscroll();
break;
}
}
void AutoscrollController::handleMouseReleaseForMiddleClickAutoscroll(
LocalFrame* frame,
const PlatformMouseEvent& mouseEvent) {
DCHECK(RuntimeEnabledFeatures::middleClickAutoscrollEnabled());
if (!frame->isMainFrame())
return;
switch (m_autoscrollType) {
case AutoscrollForMiddleClick:
if (mouseEvent.pointerProperties().button ==
WebPointerProperties::Button::Middle)
m_autoscrollType = AutoscrollForMiddleClickCanStop;
break;
case AutoscrollForMiddleClickCanStop:
stopAutoscroll();
break;
case AutoscrollForDragAndDrop:
case AutoscrollForSelection:
case NoAutoscroll:
// Nothing to do.
break;
}
}
void AutoscrollController::animate(double) {
if (!m_autoscrollLayoutObject || !m_autoscrollLayoutObject->frame()) {
stopAutoscroll();
return;
}
EventHandler& eventHandler =
m_autoscrollLayoutObject->frame()->eventHandler();
IntSize offset = m_autoscrollLayoutObject->calculateAutoscrollDirection(
eventHandler.lastKnownMousePosition());
IntPoint selectionPoint = eventHandler.lastKnownMousePosition() + offset;
switch (m_autoscrollType) {
case AutoscrollForDragAndDrop:
if (WTF::monotonicallyIncreasingTime() -
m_dragAndDropAutoscrollStartTime >
autoscrollDelay)
m_autoscrollLayoutObject->autoscroll(
m_dragAndDropAutoscrollReferencePosition);
break;
case AutoscrollForSelection:
if (!eventHandler.mousePressed()) {
stopAutoscroll();
return;
}
eventHandler.updateSelectionForMouseDrag();
m_autoscrollLayoutObject->autoscroll(selectionPoint);
break;
case NoAutoscroll:
break;
case AutoscrollForMiddleClickCanStop:
case AutoscrollForMiddleClick:
DCHECK(RuntimeEnabledFeatures::middleClickAutoscrollEnabled());
if (!middleClickAutoscrollInProgress()) {
stopAutoscroll();
return;
}
if (FrameView* view = m_autoscrollLayoutObject->frame()->view())
updateMiddleClickAutoscrollState(view,
eventHandler.lastKnownMousePosition());
FloatSize delta = calculateAutoscrollDelta();
if (delta.isZero())
break;
ScrollResult result =
m_autoscrollLayoutObject->scroll(ScrollByPixel, delta);
LayoutObject* layoutObject = m_autoscrollLayoutObject;
while (!m_didLatchForMiddleClickAutoscroll && !result.didScroll()) {
if (layoutObject->node() && layoutObject->node()->isDocumentNode()) {
Element* owner = toDocument(layoutObject->node())->localOwner();
layoutObject = owner ? owner->layoutObject() : nullptr;
} else {
layoutObject = layoutObject->parent();
}
if (!layoutObject) {
break;
}
if (layoutObject && layoutObject->isBox() &&
toLayoutBox(layoutObject)->canBeScrolledAndHasScrollableArea())
result = toLayoutBox(layoutObject)->scroll(ScrollByPixel, delta);
}
if (result.didScroll()) {
m_didLatchForMiddleClickAutoscroll = true;
m_autoscrollLayoutObject = toLayoutBox(layoutObject);
}
break;
}
if (m_autoscrollType != NoAutoscroll && m_autoscrollLayoutObject)
m_page->chromeClient().scheduleAnimation(
m_autoscrollLayoutObject->frame()->view());
}
