bool DragController::performDrag(DragData* dragData)
{
ASSERT(dragData);
m_documentUnderMouse = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
if (m_dragDestinationAction & DragDestinationActionDHTML) {
m_client->willPerformDragDestinationAction(DragDestinationActionDHTML, dragData);
RefPtr<Frame> mainFrame = m_page->mainFrame();
bool preventedDefault = false;
if (mainFrame->view()) {
// Sending an event can result in the destruction of the view and part.
RefPtr<Clipboard> clipboard = Clipboard::create(ClipboardReadable, dragData, mainFrame.get());
clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
preventedDefault = mainFrame->eventHandler()->performDragAndDrop(createMouseEvent(dragData), clipboard.get());
clipboard->setAccessPolicy(ClipboardNumb); // Invalidate clipboard here for security
}
if (preventedDefault) {
m_documentUnderMouse = 0;
return true;
}
}
if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) {
m_documentUnderMouse = 0;
return true;
}
m_documentUnderMouse = 0;
if (operationForLoad(dragData) == DragOperationNone)
return false;
m_client->willPerformDragDestinationAction(DragDestinationActionLoad, dragData);
m_page->mainFrame()->loader()->load(ResourceRequest(dragData->asURL(m_page->mainFrame())), false);
return true;
}
DragOperation DragController::dragEnteredOrUpdated(DragData* dragData)
{
ASSERT(dragData);
IntPoint windowPoint = dragData->clientPosition();
Document* newDraggingDoc = 0;
if (Frame* frame = m_page->mainFrame())
newDraggingDoc = frame->documentAtPoint(windowPoint);
if (m_document != newDraggingDoc) {
if (m_document)
cancelDrag();
m_document = newDraggingDoc;
}
m_dragDestinationAction = m_client->actionMaskForDrag(dragData);
DragOperation operation = DragOperationNone;
if (m_dragDestinationAction == DragDestinationActionNone)
cancelDrag();
else {
operation = tryDocumentDrag(dragData, m_dragDestinationAction);
if (operation == DragOperationNone && (m_dragDestinationAction & DragDestinationActionLoad))
return operationForLoad(dragData);
}
return operation;
}
DragSession DragController::dragEnteredOrUpdated(DragData* dragData)
{
ASSERT(dragData);
ASSERT(m_page->mainFrame()); // It is not possible in Mac WebKit to have a Page without a mainFrame()
mouseMovedIntoDocument(m_page->mainFrame()->documentAtPoint(dragData->clientPosition()));
m_dragDestinationAction = m_client->actionMaskForDrag(dragData);
if (m_dragDestinationAction == DragDestinationActionNone) {
cancelDrag(); // FIXME: Why not call mouseMovedIntoDocument(0)?
return DragSession();
}
DragSession dragSession;
bool handledByDocument = tryDocumentDrag(dragData, m_dragDestinationAction, dragSession);
if (!handledByDocument && (m_dragDestinationAction & DragDestinationActionLoad))
dragSession.operation = operationForLoad(dragData);
return dragSession;
}