void AutoscrollController::autoscrollTimerFired(Timer<AutoscrollController>&)
{
if (!m_autoscrollRenderer) {
stopAutoscrollTimer();
return;
}
Frame& frame = m_autoscrollRenderer->frame();
switch (m_autoscrollType) {
case AutoscrollForDragAndDrop:
if (WTF::currentTime() - m_dragAndDropAutoscrollStartTime > autoscrollDelay)
m_autoscrollRenderer->autoscroll(m_dragAndDropAutoscrollReferencePosition);
break;
case AutoscrollForSelection: {
if (!frame.eventHandler().mousePressed()) {
stopAutoscrollTimer();
return;
}
#if ENABLE(DRAG_SUPPORT)
frame.eventHandler().updateSelectionForMouseDrag();
#endif
m_autoscrollRenderer->autoscroll(frame.eventHandler().lastKnownMousePosition());
break;
}
case NoAutoscroll:
break;
#if ENABLE(PAN_SCROLLING)
case AutoscrollForPanCanStop:
case AutoscrollForPan:
// we verify that the main frame hasn't received the order to stop the panScroll
if (Frame* mainFrame = getMainFrame(&frame)) {
if (!mainFrame->eventHandler().panScrollInProgress()) {
stopAutoscrollTimer();
return;
}
}
if (FrameView* view = frame.view())
updatePanScrollState(view, frame.eventHandler().lastKnownMousePosition());
m_autoscrollRenderer->panScroll(m_panScrollStartPos);
break;
#endif
}
}
void AutoscrollController::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
{
switch (m_autoscrollType) {
case AutoscrollForPan:
if (mouseEvent.button() == MiddleButton)
m_autoscrollType = AutoscrollForPanCanStop;
break;
case AutoscrollForPanCanStop:
stopAutoscrollTimer();
break;
}
}
void AutoscrollController::updateDragAndDrop(Node* dropTargetNode, const IntPoint& eventPosition, double eventTime)
{
if (!dropTargetNode) {
stopAutoscrollTimer();
return;
}
RenderBox* scrollable = RenderBox::findAutoscrollable(dropTargetNode->renderer());
if (!scrollable) {
stopAutoscrollTimer();
return;
}
Frame& frame = scrollable->frame();
Page* page = frame.page();
if (!page || !page->settings().autoscrollForDragAndDropEnabled()) {
stopAutoscrollTimer();
return;
}
IntSize offset = scrollable->calculateAutoscrollDirection(eventPosition);
if (offset.isZero()) {
stopAutoscrollTimer();
return;
}
m_dragAndDropAutoscrollReferencePosition = eventPosition + offset;
if (m_autoscrollType == NoAutoscroll) {
m_autoscrollType = AutoscrollForDragAndDrop;
m_autoscrollRenderer = scrollable;
m_dragAndDropAutoscrollStartTime = eventTime;
startAutoscrollTimer();
} else if (m_autoscrollRenderer != scrollable) {
m_dragAndDropAutoscrollStartTime = eventTime;
m_autoscrollRenderer = scrollable;
}
}
void AutoscrollController::autoscrollTimerFired(Timer<AutoscrollController>*)
{
if (!m_autoscrollRenderer) {
stopAutoscrollTimer();
return;
}
EventHandler* eventHandler = m_autoscrollRenderer->frame()->eventHandler();
switch (m_autoscrollType) {
case AutoscrollForDragAndDrop:
if (WTF::currentTime() - m_dragAndDropAutoscrollStartTime > autoscrollDelay)
m_autoscrollRenderer->autoscroll(m_dragAndDropAutoscrollReferencePosition);
break;
case AutoscrollForSelection:
if (!eventHandler->mousePressed()) {
stopAutoscrollTimer();
return;
}
eventHandler->updateSelectionForMouseDrag();
m_autoscrollRenderer->autoscroll(eventHandler->lastKnownMousePosition());
break;
case NoAutoscroll:
break;
#if ENABLE(PAN_SCROLLING)
case AutoscrollForPanCanStop:
case AutoscrollForPan:
if (!panScrollInProgress()) {
stopAutoscrollTimer();
return;
}
if (FrameView* view = m_autoscrollRenderer->frame()->view())
updatePanScrollState(view, eventHandler->lastKnownMousePosition());
m_autoscrollRenderer->panScroll(m_panScrollStartPos);
break;
#endif
}
}
void AutoscrollController::handleMouseReleaseForPanScrolling(Frame* frame, const PlatformMouseEvent& mouseEvent)
{
Page* page = frame->page();
if (!page || page->mainFrame() != frame)
return;
switch (m_autoscrollType) {
case AutoscrollForPan:
if (mouseEvent.button() == MiddleButton)
m_autoscrollType = AutoscrollForPanCanStop;
break;
case AutoscrollForPanCanStop:
stopAutoscrollTimer();
break;
}
}
