DragController.cpp 39.8 KB
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/*
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 * Copyright (C) 2007, 2009, 2010, 2013 Apple Inc. All rights reserved.
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "DragController.h"

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#if ENABLE(DRAG_SUPPORT)
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#include "CachedImage.h"
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#include "Clipboard.h"
#include "ClipboardAccessPolicy.h"
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#include "CachedResourceLoader.h"
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#include "Document.h"
#include "DocumentFragment.h"
#include "DragActions.h"
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#include "DragClient.h"
#include "DragData.h"
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#include "DragSession.h"
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#include "DragState.h"
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#include "Editor.h"
#include "EditorClient.h"
#include "Element.h"
#include "EventHandler.h"
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#include "ExceptionCodePlaceholder.h"
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#include "FloatRect.h"
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#include "Frame.h"
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#include "FrameLoadRequest.h"
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#include "FrameLoader.h"
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#include "FrameSelection.h"
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#include "FrameView.h"
#include "HTMLAnchorElement.h"
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#include "HTMLImageElement.h"
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#include "HTMLInputElement.h"
#include "HTMLNames.h"
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#include "HTMLPlugInElement.h"
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#include "HitTestRequest.h"
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#include "HitTestResult.h"
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#include "Image.h"
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#include "ImageOrientation.h"
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#include "MoveSelectionCommand.h"
#include "Page.h"
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#include "Pasteboard.h"
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#include "PlatformKeyboardEvent.h"
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#include "PluginDocument.h"
#include "PluginViewBase.h"
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#include "RenderFileUploadControl.h"
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#include "RenderImage.h"
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#include "RenderView.h"
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#include "ReplaceSelectionCommand.h"
#include "ResourceRequest.h"
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#include "SecurityOrigin.h"
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#include "Settings.h"
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#include "ShadowRoot.h"
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#include "StylePropertySet.h"
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#include "Text.h"
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#include "TextEvent.h"
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#include "htmlediting.h"
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#include "markup.h"
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#include <wtf/CurrentTime.h>
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#include <wtf/RefPtr.h>
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namespace WebCore {

static PlatformMouseEvent createMouseEvent(DragData* dragData)
{
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    bool shiftKey, ctrlKey, altKey, metaKey;
    shiftKey = ctrlKey = altKey = metaKey = false;
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    int keyState = dragData->modifierKeyState();
    shiftKey = static_cast<bool>(keyState & PlatformEvent::ShiftKey);
    ctrlKey = static_cast<bool>(keyState & PlatformEvent::CtrlKey);
    altKey = static_cast<bool>(keyState & PlatformEvent::AltKey);
    metaKey = static_cast<bool>(keyState & PlatformEvent::MetaKey);

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    return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(),
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                              LeftButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey,
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                              metaKey, currentTime());
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}
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DragController::DragController(Page* page, DragClient* client)
    : m_page(page)
    , m_client(client)
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    , m_documentUnderMouse(0)
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    , m_dragInitiator(0)
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    , m_fileInputElementUnderMouse(0)
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    , m_documentIsHandlingDrag(false)
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    , m_dragDestinationAction(DragDestinationActionNone)
    , m_dragSourceAction(DragSourceActionNone)
    , m_didInitiateDrag(false)
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    , m_sourceDragOperation(DragOperationNone)
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{
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    ASSERT(m_client);
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}
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DragController::~DragController()
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{
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    m_client->dragControllerDestroyed();
}
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PassOwnPtr<DragController> DragController::create(Page* page, DragClient* client)
{
    return adoptPtr(new DragController(page, client));
}

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static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragData, Frame* frame, PassRefPtr<Range> context, bool allowPlainText, bool& chosePlainText)
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{
    ASSERT(dragData);
    chosePlainText = false;

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    Document& document = context->ownerDocument();
    if (dragData->containsCompatibleContent()) {
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        if (PassRefPtr<DocumentFragment> fragment = dragData->asFragment(frame, context, allowPlainText, chosePlainText))
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            return fragment;

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        if (dragData->containsURL(frame, DragData::DoNotConvertFilenames)) {
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            String title;
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            String url = dragData->asURL(frame, DragData::DoNotConvertFilenames, &title);
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            if (!url.isEmpty()) {
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                RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(&document);
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                anchor->setHref(url);
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                if (title.isEmpty()) {
                    // Try the plain text first because the url might be normalized or escaped.
                    if (dragData->containsPlainText())
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                        title = dragData->asPlainText(frame);
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                    if (title.isEmpty())
                        title = url;
                }
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                RefPtr<Node> anchorText = document.createTextNode(title);
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                anchor->appendChild(anchorText, IGNORE_EXCEPTION);
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                RefPtr<DocumentFragment> fragment = document.createDocumentFragment();
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                fragment->appendChild(anchor, IGNORE_EXCEPTION);
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                return fragment.get();
            }
        }
    }
    if (allowPlainText && dragData->containsPlainText()) {
        chosePlainText = true;
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        return createFragmentFromText(context.get(), dragData->asPlainText(frame)).get();
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    }
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    return 0;
}

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bool DragController::dragIsMove(FrameSelection& selection, DragData* dragData)
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{
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    return m_documentUnderMouse == m_dragInitiator && selection.isContentEditable() && selection.isRange() && !isCopyKeyDown(dragData);
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}

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// FIXME: This method is poorly named.  We're just clearing the selection from the document this drag is exiting.
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void DragController::cancelDrag()
{
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    m_page->dragCaretController().clear();
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}

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void DragController::dragEnded()
{
    m_dragInitiator = 0;
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    m_didInitiateDrag = false;
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    m_page->dragCaretController().clear();
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    m_client->dragEnded();
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}
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DragSession DragController::dragEntered(DragData* dragData)
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{
    return dragEnteredOrUpdated(dragData);
}
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void DragController::dragExited(DragData* dragData)
{
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    ASSERT(dragData);
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    if (RefPtr<FrameView> v = m_page->mainFrame().view()) {
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        ClipboardAccessPolicy policy = (!m_documentUnderMouse || m_documentUnderMouse->securityOrigin()->isLocal()) ? ClipboardReadable : ClipboardTypesReadable;
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        RefPtr<Clipboard> clipboard = Clipboard::createForDragAndDrop(policy, *dragData);
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        clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
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        m_page->mainFrame().eventHandler().cancelDragAndDrop(createMouseEvent(dragData), clipboard.get());
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        clipboard->setAccessPolicy(ClipboardNumb);    // invalidate clipboard here for security
    }
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    mouseMovedIntoDocument(0);
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    if (m_fileInputElementUnderMouse)
        m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
    m_fileInputElementUnderMouse = 0;
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}
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DragSession DragController::dragUpdated(DragData* dragData)
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{
    return dragEnteredOrUpdated(dragData);
}
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bool DragController::performDrag(DragData* dragData)
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{
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    ASSERT(dragData);
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    m_documentUnderMouse = m_page->mainFrame().documentAtPoint(dragData->clientPosition());
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    if ((m_dragDestinationAction & DragDestinationActionDHTML) && m_documentIsHandlingDrag) {
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        m_client->willPerformDragDestinationAction(DragDestinationActionDHTML, dragData);
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        RefPtr<Frame> mainFrame = &m_page->mainFrame();
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        bool preventedDefault = false;
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        if (mainFrame->view()) {
            // Sending an event can result in the destruction of the view and part.
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            RefPtr<Clipboard> clipboard = Clipboard::createForDragAndDrop(ClipboardReadable, *dragData);
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            clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
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            preventedDefault = mainFrame->eventHandler().performDragAndDrop(createMouseEvent(dragData), clipboard.get());
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            clipboard->setAccessPolicy(ClipboardNumb); // Invalidate clipboard here for security
        }
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        if (preventedDefault) {
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            m_documentUnderMouse = 0;
            return true;
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        }
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    }

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    if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) {
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        m_documentUnderMouse = 0;
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        return true;
    }
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    m_documentUnderMouse = 0;
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    if (operationForLoad(dragData) == DragOperationNone)
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        return false;
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    m_client->willPerformDragDestinationAction(DragDestinationActionLoad, dragData);
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    m_page->mainFrame().loader().load(FrameLoadRequest(&m_page->mainFrame(), ResourceRequest(dragData->asURL(&m_page->mainFrame()))));
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    return true;
}
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void DragController::mouseMovedIntoDocument(Document* newDocument)
{
    if (m_documentUnderMouse == newDocument)
        return;

    // If we were over another document clear the selection
    if (m_documentUnderMouse)
        cancelDrag();
    m_documentUnderMouse = newDocument;
}

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DragSession DragController::dragEnteredOrUpdated(DragData* dragData)
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{
    ASSERT(dragData);
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    mouseMovedIntoDocument(m_page->mainFrame().documentAtPoint(dragData->clientPosition()));
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    m_dragDestinationAction = m_client->actionMaskForDrag(dragData);
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    if (m_dragDestinationAction == DragDestinationActionNone) {
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        cancelDrag(); // FIXME: Why not call mouseMovedIntoDocument(0)?
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        return DragSession();
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    }
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    DragSession dragSession;
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    m_documentIsHandlingDrag = tryDocumentDrag(dragData, m_dragDestinationAction, dragSession);
    if (!m_documentIsHandlingDrag && (m_dragDestinationAction & DragDestinationActionLoad))
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        dragSession.operation = operationForLoad(dragData);
    return dragSession;
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}
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static HTMLInputElement* asFileInput(Node* node)
{
    ASSERT(node);
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    HTMLInputElement* inputElement = node->toInputElement();
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    // If this is a button inside of the a file input, move up to the file input.
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    if (inputElement && inputElement->isTextButton() && inputElement->treeScope()->rootNode()->isShadowRoot())
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        inputElement = toShadowRoot(inputElement->treeScope()->rootNode())->hostElement()->toInputElement();
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    return inputElement && inputElement->isFileUpload() ? inputElement : 0;
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}
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// This can return null if an empty document is loaded.
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static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p)
{
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    Frame* frame = documentUnderMouse->frame();
    float zoomFactor = frame ? frame->pageZoomFactor() : 1;
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    LayoutPoint point = roundedLayoutPoint(FloatPoint(p.x() * zoomFactor, p.y() * zoomFactor));
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    HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
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    HitTestResult result(point);
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    documentUnderMouse->renderView()->hitTest(request, result);
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    Node* n = result.innerNode();
    while (n && !n->isElementNode())
        n = n->parentNode();
    if (n)
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        n = n->deprecatedShadowAncestorNode();
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    return toElement(n);
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}

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bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragSession& dragSession)
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{
    ASSERT(dragData);
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    if (!m_documentUnderMouse)
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        return false;
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    if (m_dragInitiator && !m_documentUnderMouse->securityOrigin()->canReceiveDragData(m_dragInitiator->securityOrigin()))
        return false;

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    bool isHandlingDrag = false;
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    if (actionMask & DragDestinationActionDHTML) {
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        isHandlingDrag = tryDHTMLDrag(dragData, dragSession.operation);
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        // Do not continue if m_documentUnderMouse has been reset by tryDHTMLDrag.
        // tryDHTMLDrag fires dragenter event. The event listener that listens
        // to this event may create a nested message loop (open a modal dialog),
        // which could process dragleave event and reset m_documentUnderMouse in
        // dragExited.
        if (!m_documentUnderMouse)
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            return false;
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    }
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    // It's unclear why this check is after tryDHTMLDrag.
    // We send drag events in tryDHTMLDrag and that may be the reason.
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    RefPtr<FrameView> frameView = m_documentUnderMouse->view();
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    if (!frameView)
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        return false;

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    if (isHandlingDrag) {
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        m_page->dragCaretController().clear();
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        return true;
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    }

    if ((actionMask & DragDestinationActionEdit) && canProcessDrag(dragData)) {
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        if (dragData->containsColor()) {
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            dragSession.operation = DragOperationGeneric;
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            return true;
        }
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        IntPoint point = frameView->windowToContents(dragData->clientPosition());
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        Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
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        if (!element)
            return false;
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        HTMLInputElement* elementAsFileInput = asFileInput(element);
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        if (m_fileInputElementUnderMouse != elementAsFileInput) {
            if (m_fileInputElementUnderMouse)
                m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
            m_fileInputElementUnderMouse = elementAsFileInput;
        }
        
        if (!m_fileInputElementUnderMouse)
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            m_page->dragCaretController().setCaretPosition(m_documentUnderMouse->frame()->visiblePositionForPoint(point));
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        Frame* innerFrame = element->document().frame();
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        dragSession.operation = dragIsMove(innerFrame->selection(), dragData) ? DragOperationMove : DragOperationCopy;
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        dragSession.mouseIsOverFileInput = m_fileInputElementUnderMouse;
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        dragSession.numberOfItemsToBeAccepted = 0;

        unsigned numberOfFiles = dragData->numberOfFiles();
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        if (m_fileInputElementUnderMouse) {
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            if (m_fileInputElementUnderMouse->isDisabledFormControl())
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                dragSession.numberOfItemsToBeAccepted = 0;
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            else if (m_fileInputElementUnderMouse->multiple())
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                dragSession.numberOfItemsToBeAccepted = numberOfFiles;
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            else if (numberOfFiles > 1)
                dragSession.numberOfItemsToBeAccepted = 0;
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            else
                dragSession.numberOfItemsToBeAccepted = 1;
            
            if (!dragSession.numberOfItemsToBeAccepted)
                dragSession.operation = DragOperationNone;
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            m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(dragSession.numberOfItemsToBeAccepted);
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        } else {
            // We are not over a file input element. The dragged item(s) will only
            // be loaded into the view the number of dragged items is 1.
            dragSession.numberOfItemsToBeAccepted = numberOfFiles != 1 ? 0 : 1;
        }
        
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        return true;
    }
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    // We are not over an editable region. Make sure we're clearing any prior drag cursor.
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    m_page->dragCaretController().clear();
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    if (m_fileInputElementUnderMouse)
        m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
    m_fileInputElementUnderMouse = 0;
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    return false;
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}
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DragSourceAction DragController::delegateDragSourceAction(const IntPoint& rootViewPoint)
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{
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    m_dragSourceAction = m_client->dragSourceActionMaskForPoint(rootViewPoint);
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    return m_dragSourceAction;
}
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DragOperation DragController::operationForLoad(DragData* dragData)
{
    ASSERT(dragData);
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    Document* doc = m_page->mainFrame().documentAtPoint(dragData->clientPosition());
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    bool pluginDocumentAcceptsDrags = false;

    if (doc && doc->isPluginDocument()) {
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        const Widget* widget = toPluginDocument(doc)->pluginWidget();
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        const PluginViewBase* pluginView = (widget && widget->isPluginViewBase()) ? static_cast<const PluginViewBase*>(widget) : 0;

        if (pluginView)
            pluginDocumentAcceptsDrags = pluginView->shouldAllowNavigationFromDrags();
    }

    if (doc && (m_didInitiateDrag || (doc->isPluginDocument() && !pluginDocumentAcceptsDrags) || doc->rendererIsEditable()))
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        return DragOperationNone;
    return dragOperation(dragData);
}

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static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, RefPtr<Range>& range, const IntPoint& point)
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{
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    frame->selection().setSelection(dragCaret);
    if (frame->selection().isNone()) {
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        dragCaret = frame->visiblePositionForPoint(point);
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        frame->selection().setSelection(dragCaret);
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        range = dragCaret.toNormalizedRange();
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    }
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    return !frame->selection().isNone() && frame->selection().isContentEditable();
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}

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bool DragController::dispatchTextInputEventFor(Frame* innerFrame, DragData* dragData)
{
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    ASSERT(m_page->dragCaretController().hasCaret());
    String text = m_page->dragCaretController().isContentRichlyEditable() ? "" : dragData->asPlainText(innerFrame);
    Node* target = innerFrame->editor().findEventTargetFrom(m_page->dragCaretController().caretPosition());
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    return target->dispatchEvent(TextEvent::createForDrop(innerFrame->document()->domWindow(), text), IGNORE_EXCEPTION);
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}

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bool DragController::concludeEditDrag(DragData* dragData)
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{
    ASSERT(dragData);
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    RefPtr<HTMLInputElement> fileInput = m_fileInputElementUnderMouse;
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    if (m_fileInputElementUnderMouse) {
        m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
        m_fileInputElementUnderMouse = 0;
    }

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    if (!m_documentUnderMouse)
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        return false;
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    IntPoint point = m_documentUnderMouse->view()->windowToContents(dragData->clientPosition());
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    Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
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    if (!element)
        return false;
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    RefPtr<Frame> innerFrame = element->document().frame();
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    ASSERT(innerFrame);
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    if (m_page->dragCaretController().hasCaret() && !dispatchTextInputEventFor(innerFrame.get(), dragData))
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        return true;

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    if (dragData->containsColor()) {
        Color color = dragData->asColor();
        if (!color.isValid())
            return false;
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        RefPtr<Range> innerRange = innerFrame->selection().toNormalizedRange();
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        RefPtr<MutableStylePropertySet> style = MutableStylePropertySet::create();
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        style->setProperty(CSSPropertyColor, color.serialized(), false);
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        if (!innerFrame->editor().shouldApplyStyle(style.get(), innerRange.get()))
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            return false;
        m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
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        innerFrame->editor().applyStyle(style.get(), EditActionSetColor);
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        return true;
    }
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    if (dragData->containsFiles() && fileInput) {
        // fileInput should be the element we hit tested for, unless it was made
        // display:none in a drop event handler.
        ASSERT(fileInput == element || !fileInput->renderer());
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        if (fileInput->isDisabledFormControl())
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            return false;
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        return fileInput->receiveDroppedFiles(dragData);
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    }
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    if (!m_page->dragController().canProcessDrag(dragData)) {
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        m_page->dragCaretController().clear();
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        return false;
    }

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    VisibleSelection dragCaret = m_page->dragCaretController().caretPosition();
    m_page->dragCaretController().clear();
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    RefPtr<Range> range = dragCaret.toNormalizedRange();
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    RefPtr<Element> rootEditableElement = innerFrame->selection().rootEditableElement();
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    // For range to be null a WebKit client must have done something bad while
    // manually controlling drag behaviour
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    if (!range)
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        return false;
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    CachedResourceLoader* cachedResourceLoader = range->ownerDocument().cachedResourceLoader();
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    ResourceCacheValidationSuppressor validationSuppressor(cachedResourceLoader);
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    if (dragIsMove(innerFrame->selection(), dragData) || dragCaret.isContentRichlyEditable()) {
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        bool chosePlainText = false;
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        RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, innerFrame.get(), range, true, chosePlainText);
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        if (!fragment || !innerFrame->editor().shouldInsertFragment(fragment, range, EditorInsertActionDropped)) {
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            return false;
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        }
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        m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
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        if (dragIsMove(innerFrame->selection(), dragData)) {
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            // NSTextView behavior is to always smart delete on moving a selection,
            // but only to smart insert if the selection granularity is word granularity.
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            bool smartDelete = innerFrame->editor().smartInsertDeleteEnabled();
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            bool smartInsert = smartDelete && innerFrame->selection().granularity() == WordGranularity && dragData->canSmartReplace();
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            applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete));
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        } else {
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            if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) {
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                ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting;
                if (dragData->canSmartReplace())
                    options |= ReplaceSelectionCommand::SmartReplace;
                if (chosePlainText)
                    options |= ReplaceSelectionCommand::MatchStyle;
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                applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse, fragment, options));
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            }
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        }
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    } else {
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        String text = dragData->asPlainText(innerFrame.get());
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        if (text.isEmpty() || !innerFrame->editor().shouldInsertText(text, range.get(), EditorInsertActionDropped)) {
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            return false;
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        }
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        m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
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        if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point))
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            applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse, createFragmentFromText(range.get(), text),  ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::MatchStyle | ReplaceSelectionCommand::PreventNesting));
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    }

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    if (rootEditableElement) {
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        if (Frame* frame = rootEditableElement->document().frame())
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            frame->eventHandler().updateDragStateAfterEditDragIfNeeded(rootEditableElement.get());
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    }

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    return true;
}
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bool DragController::canProcessDrag(DragData* dragData)
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{
    ASSERT(dragData);

    if (!dragData->containsCompatibleContent())
        return false;
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    IntPoint point = m_page->mainFrame().view()->windowToContents(dragData->clientPosition());
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    HitTestResult result = HitTestResult(point);
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    if (!m_page->mainFrame().contentRenderer())
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        return false;

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    result = m_page->mainFrame().eventHandler().hitTestResultAtPoint(point, HitTestRequest::ReadOnly | HitTestRequest::Active);
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    if (!result.innerNonSharedNode())
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        return false;
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    if (dragData->containsFiles() && asFileInput(result.innerNonSharedNode()))
        return true;
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    if (result.innerNonSharedNode()->isPluginElement()) {
        HTMLPlugInElement* plugin = static_cast<HTMLPlugInElement*>(result.innerNonSharedNode());
        if (!plugin->canProcessDrag() && !result.innerNonSharedNode()->rendererIsEditable())
            return false;
    } else if (!result.innerNonSharedNode()->rendererIsEditable())
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        return false;
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    if (m_didInitiateDrag && m_documentUnderMouse == m_dragInitiator && result.isSelected())
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        return false;
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    return true;
}

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static DragOperation defaultOperationForDrag(DragOperation srcOpMask)
{
    // This is designed to match IE's operation fallback for the case where
    // the page calls preventDefault() in a drag event but doesn't set dropEffect.
    if (srcOpMask == DragOperationEvery)
        return DragOperationCopy;
    if (srcOpMask == DragOperationNone)
        return DragOperationNone;
    if (srcOpMask & DragOperationMove || srcOpMask & DragOperationGeneric)
        return DragOperationMove;
    if (srcOpMask & DragOperationCopy)
        return DragOperationCopy;
    if (srcOpMask & DragOperationLink)
        return DragOperationLink;
    
    // FIXME: Does IE really return "generic" even if no operations were allowed by the source?
    return DragOperationGeneric;
}

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bool DragController::tryDHTMLDrag(DragData* dragData, DragOperation& operation)
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{
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    ASSERT(dragData);
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    ASSERT(m_documentUnderMouse);
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    RefPtr<Frame> mainFrame = &m_page->mainFrame();
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    RefPtr<FrameView> viewProtector = mainFrame->view();
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    if (!viewProtector)
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        return false;

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    ClipboardAccessPolicy policy = m_documentUnderMouse->securityOrigin()->isLocal() ? ClipboardReadable : ClipboardTypesReadable;
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    RefPtr<Clipboard> clipboard = Clipboard::createForDragAndDrop(policy, *dragData);
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    DragOperation srcOpMask = dragData->draggingSourceOperationMask();
    clipboard->setSourceOperation(srcOpMask);
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    PlatformMouseEvent event = createMouseEvent(dragData);
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    if (!mainFrame->eventHandler().updateDragAndDrop(event, clipboard.get())) {
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        clipboard->setAccessPolicy(ClipboardNumb);    // invalidate clipboard here for security
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        return false;
    }

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    operation = clipboard->destinationOperation();
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    if (clipboard->dropEffectIsUninitialized())
        operation = defaultOperationForDrag(srcOpMask);
    else if (!(srcOpMask & operation)) {
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        // The element picked an operation which is not supported by the source
        operation = DragOperationNone;
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    }
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    clipboard->setAccessPolicy(ClipboardNumb);    // invalidate clipboard here for security
    return true;
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}

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Element* DragController::draggableElement(const Frame* sourceFrame, Element* startElement, const IntPoint& dragOrigin, DragState& state) const
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{
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    state.type = (sourceFrame->selection().contains(dragOrigin)) ? DragSourceActionSelection : DragSourceActionNone;
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    if (!startElement)
        return 0;
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    for (const RenderObject* renderer = startElement->renderer(); renderer; renderer = renderer->parent()) {
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        Node* node = renderer->nonPseudoNode();
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        if (!node)
            // Anonymous render blocks don't correspond to actual DOM nodes, so we skip over them
            // for the purposes of finding a draggable node.
            continue;
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        if (!(state.type & DragSourceActionSelection) && node->isTextNode() && node->canStartSelection())
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            // In this case we have a click in the unselected portion of text. If this text is
            // selectable, we want to start the selection process instead of looking for a parent
            // to try to drag.
            return 0;
        if (node->isElementNode()) {
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            EUserDrag dragMode = renderer->style()->userDrag();
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            if ((m_dragSourceAction & DragSourceActionDHTML) && dragMode == DRAG_ELEMENT) {
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                state.type = static_cast<DragSourceAction>(state.type | DragSourceActionDHTML);
                return toElement(node);
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            }
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            if (dragMode == DRAG_AUTO) {
                if ((m_dragSourceAction & DragSourceActionImage)
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                    && isHTMLImageElement(node)
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                    && sourceFrame->settings().loadsImagesAutomatically()) {
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                    state.type = static_cast<DragSourceAction>(state.type | DragSourceActionImage);
                    return toElement(node);
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                }
                if ((m_dragSourceAction & DragSourceActionLink)
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                    && isHTMLAnchorElement(node)
                    && toHTMLAnchorElement(node)->isLiveLink()) {
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                    state.type = static_cast<DragSourceAction>(state.type | DragSourceActionLink);
                    return toElement(node);
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                }
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            }
        }
    }
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    // We either have nothing to drag or we have a selection and we're not over a draggable element.
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    return (state.type & DragSourceActionSelection) ? startElement : 0;
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}
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static CachedImage* getCachedImage(Element* element)
{
    ASSERT(element);
    RenderObject* renderer = element->renderer();
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    if (!renderer || !renderer->isImage())
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        return 0;
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    RenderImage* image = toRenderImage(renderer);
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    return image->cachedImage();
}
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static Image* getImage(Element* element)
{
    ASSERT(element);
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    CachedImage* cachedImage = getCachedImage(element);
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    // Don't use cachedImage->imageForRenderer() here as that may return BitmapImages for cached SVG Images.
    // Users of getImage() want access to the SVGImage, in order to figure out the filename extensions,
    // which would be empty when asking the cached BitmapImages.
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    return (cachedImage && !cachedImage->errorOccurred()) ?
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        cachedImage->image() : 0;
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}
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static void selectElement(Element* element)
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{
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    RefPtr<Range> range = element->document().createRange();
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    range->selectNode(element);
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    element->document().frame()->selection().setSelection(VisibleSelection(range.get(), DOWNSTREAM));
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}
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static IntPoint dragLocForDHTMLDrag(const IntPoint& mouseDraggedPoint, const IntPoint& dragOrigin, const IntPoint& dragImageOffset, bool isLinkImage)
{
    // dragImageOffset is the cursor position relative to the lower-left corner of the image.
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#if PLATFORM(MAC)
    // We add in the Y dimension because we are a flipped view, so adding moves the image down.
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    const int yOffset = dragImageOffset.y();
#else
    const int yOffset = -dragImageOffset.y();
#endif
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    if (isLinkImage)
        return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset);
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    return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset);
}
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static IntPoint dragLocForSelectionDrag(Frame* src)
{
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    IntRect draggingRect = enclosingIntRect(src->selection().bounds());
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    int xpos = draggingRect.maxX();
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    xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos;
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    int ypos = draggingRect.maxY();
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#if PLATFORM(MAC)
    // Deal with flipped coordinates on Mac
    ypos = draggingRect.y() > ypos ? draggingRect.y() : ypos;
#else
    ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos;
#endif
    return IntPoint(xpos, ypos);
}
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bool DragController::startDrag(Frame* src, const DragState& state, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin)
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{
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    ASSERT(src);
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    if (!src->view() || !src->contentRenderer())
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        return false;
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    HitTestResult hitTestResult = src->eventHandler().hitTestResultAtPoint(dragOrigin, HitTestRequest::ReadOnly | HitTestRequest::Active);
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    if (!state.source->contains(hitTestResult.innerNode()))
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        // The original node being dragged isn't under the drag origin anymore... maybe it was
        // hidden or moved out from under the cursor. Regardless, we don't want to start a drag on
        // something that's not actually under the drag origin.
        return false;
    KURL linkURL = hitTestResult.absoluteLinkURL();
    KURL imageURL = hitTestResult.absoluteImageURL();
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    IntPoint mouseDraggedPoint = src->view()->windowToContents(dragEvent.position());
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    m_draggingImageURL = KURL();
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    m_sourceDragOperation = srcOp;
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    DragImageRef dragImage = 0;
    IntPoint dragLoc(0, 0);
    IntPoint dragImageOffset(0, 0);
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