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/*
* Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
*
* 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"
#if ENABLE(DRAG_SUPPORT)
#include "CachedImage.h"
#include "Clipboard.h"
#include "ClipboardAccessPolicy.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "DocumentFragment.h"
#include "DragActions.h"
#include "DragClient.h"
#include "DragData.h"
#include "DragSession.h"
#include "DragState.h"
#include "Editor.h"
#include "EditorClient.h"
#include "Element.h"
#include "EventHandler.h"
#include "ExceptionCodePlaceholder.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameLoadRequest.h"
#include "FrameLoader.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "HTMLAnchorElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HTMLPlugInElement.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "Image.h"
#include "ImageOrientation.h"
#include "MoveSelectionCommand.h"
#include "Node.h"
#include "Page.h"
#include "PlatformKeyboardEvent.h"
#include "PluginDocument.h"
#include "PluginViewBase.h"
#include "RenderFileUploadControl.h"
#include "RenderImage.h"
#include "RenderView.h"
#include "ReplaceSelectionCommand.h"
#include "ResourceRequest.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "StylePropertySet.h"
#include "Text.h"
#include "TextEvent.h"
#include "htmlediting.h"
#include "markup.h"
#include <wtf/CurrentTime.h>
#include <wtf/RefPtr.h>
namespace WebCore {
static PlatformMouseEvent createMouseEvent(DragData* dragData)
{
bool shiftKey, ctrlKey, altKey, metaKey;
shiftKey = ctrlKey = altKey = metaKey = false;
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);
return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(),
LeftButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey,
metaKey, currentTime());
}
DragController::DragController(Page* page, DragClient* client)
: m_page(page)
, m_client(client)
, m_documentUnderMouse(0)
, m_dragInitiator(0)
, m_fileInputElementUnderMouse(0)
, m_documentIsHandlingDrag(false)
, m_dragDestinationAction(DragDestinationActionNone)
, m_dragSourceAction(DragSourceActionNone)
, m_didInitiateDrag(false)
, m_sourceDragOperation(DragOperationNone)
{
ASSERT(m_client);
}
DragController::~DragController()
{
m_client->dragControllerDestroyed();
}
PassOwnPtr<DragController> DragController::create(Page* page, DragClient* client)
{
return adoptPtr(new DragController(page, client));
}
static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragData, Frame* frame, RefPtr<Range> context,
bool allowPlainText, bool& chosePlainText)
{
ASSERT(dragData);
chosePlainText = false;
Document* document = context->ownerDocument();
ASSERT(document);
if (document && dragData->containsCompatibleContent()) {
if (PassRefPtr<DocumentFragment> fragment = dragData->asFragment(frame, context, allowPlainText, chosePlainText))
return fragment;
if (dragData->containsURL(frame, DragData::DoNotConvertFilenames)) {
String title;
String url = dragData->asURL(frame, DragData::DoNotConvertFilenames, &title);
if (!url.isEmpty()) {
RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(document);
anchor->setHref(url);
if (title.isEmpty()) {
// Try the plain text first because the url might be normalized or escaped.
if (dragData->containsPlainText())
title = dragData->asPlainText(frame);
if (title.isEmpty())
title = url;
}
RefPtr<Node> anchorText = document->createTextNode(title);
anchor->appendChild(anchorText, IGNORE_EXCEPTION);
RefPtr<DocumentFragment> fragment = document->createDocumentFragment();
fragment->appendChild(anchor, IGNORE_EXCEPTION);
return fragment.get();
}
}
}
if (allowPlainText && dragData->containsPlainText()) {
chosePlainText = true;
return createFragmentFromText(context.get(), dragData->asPlainText(frame)).get();
}
return 0;
}
bool DragController::dragIsMove(FrameSelection* selection, DragData* dragData)
{
return m_documentUnderMouse == m_dragInitiator && selection->isContentEditable() && selection->isRange() && !isCopyKeyDown(dragData);
}
// FIXME: This method is poorly named. We're just clearing the selection from the document this drag is exiting.
void DragController::cancelDrag()
{
m_page->dragCaretController()->clear();
}
void DragController::dragEnded()
{
m_dragInitiator = 0;
m_didInitiateDrag = false;
m_page->dragCaretController()->clear();
m_client->dragEnded();
}
DragSession DragController::dragEntered(DragData* dragData)
{
return dragEnteredOrUpdated(dragData);
}
void DragController::dragExited(DragData* dragData)
{
ASSERT(dragData);
Frame* mainFrame = m_page->mainFrame();
if (RefPtr<FrameView> v = mainFrame->view()) {
ClipboardAccessPolicy policy = (!m_documentUnderMouse || m_documentUnderMouse->securityOrigin()->isLocal()) ? ClipboardReadable : ClipboardTypesReadable;
RefPtr<Clipboard> clipboard = Clipboard::create(policy, dragData, mainFrame);
clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
mainFrame->eventHandler()->cancelDragAndDrop(createMouseEvent(dragData), clipboard.get());
clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security
}
mouseMovedIntoDocument(0);
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = 0;
}
DragSession DragController::dragUpdated(DragData* dragData)
{
return dragEnteredOrUpdated(dragData);
}
bool DragController::performDrag(DragData* dragData)
{
ASSERT(dragData);
m_documentUnderMouse = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
if ((m_dragDestinationAction & DragDestinationActionDHTML) && m_documentIsHandlingDrag) {
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(FrameLoadRequest(m_page->mainFrame(), ResourceRequest(dragData->asURL(m_page->mainFrame()))));
return true;
}
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;
}
DragSession DragController::dragEnteredOrUpdated(DragData* dragData)
{
ASSERT(dragData);
ASSERT(m_page->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;
m_documentIsHandlingDrag = tryDocumentDrag(dragData, m_dragDestinationAction, dragSession);
if (!m_documentIsHandlingDrag && (m_dragDestinationAction & DragDestinationActionLoad))
dragSession.operation = operationForLoad(dragData);
return dragSession;
}
static HTMLInputElement* asFileInput(Node* node)
{
ASSERT(node);
HTMLInputElement* inputElement = node->toInputElement();
// If this is a button inside of the a file input, move up to the file input.
if (inputElement && inputElement->isTextButton() && inputElement->treeScope()->rootNode()->isShadowRoot())
inputElement = toShadowRoot(inputElement->treeScope()->rootNode())->host()->toInputElement();
return inputElement && inputElement->isFileUpload() ? inputElement : 0;
}
// This can return null if an empty document is loaded.
static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p)
{
Frame* frame = documentUnderMouse->frame();
float zoomFactor = frame ? frame->pageZoomFactor() : 1;
LayoutPoint point = roundedLayoutPoint(FloatPoint(p.x() * zoomFactor, p.y() * zoomFactor));
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent);
HitTestResult result(point);
documentUnderMouse->renderView()->hitTest(request, result);
Node* n = result.innerNode();
while (n && !n->isElementNode())
n = n->parentNode();
if (n)
n = n->deprecatedShadowAncestorNode();
return toElement(n);
}
bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragSession& dragSession)
{
ASSERT(dragData);
if (!m_documentUnderMouse)
return false;
if (m_dragInitiator && !m_documentUnderMouse->securityOrigin()->canReceiveDragData(m_dragInitiator->securityOrigin()))
return false;
bool isHandlingDrag = false;
if (actionMask & DragDestinationActionDHTML) {
isHandlingDrag = tryDHTMLDrag(dragData, dragSession.operation);
// 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)
return false;
}
// It's unclear why this check is after tryDHTMLDrag.
// We send drag events in tryDHTMLDrag and that may be the reason.
RefPtr<FrameView> frameView = m_documentUnderMouse->view();
if (!frameView)
return false;
if (isHandlingDrag) {
m_page->dragCaretController()->clear();
return true;
}
if ((actionMask & DragDestinationActionEdit) && canProcessDrag(dragData)) {
if (dragData->containsColor()) {
dragSession.operation = DragOperationGeneric;
return true;
}
IntPoint point = frameView->windowToContents(dragData->clientPosition());
Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
if (!element)
return false;
HTMLInputElement* elementAsFileInput = asFileInput(element);
if (m_fileInputElementUnderMouse != elementAsFileInput) {
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = elementAsFileInput;
}
if (!m_fileInputElementUnderMouse)
m_page->dragCaretController()->setCaretPosition(m_documentUnderMouse->frame()->visiblePositionForPoint(point));
Frame* innerFrame = element->document()->frame();
dragSession.operation = dragIsMove(innerFrame->selection(), dragData) ? DragOperationMove : DragOperationCopy;
dragSession.mouseIsOverFileInput = m_fileInputElementUnderMouse;
dragSession.numberOfItemsToBeAccepted = 0;
unsigned numberOfFiles = dragData->numberOfFiles();
if (m_fileInputElementUnderMouse) {
if (m_fileInputElementUnderMouse->isDisabledFormControl())
dragSession.numberOfItemsToBeAccepted = 0;
else if (m_fileInputElementUnderMouse->multiple())
dragSession.numberOfItemsToBeAccepted = numberOfFiles;
else if (numberOfFiles > 1)
dragSession.numberOfItemsToBeAccepted = 0;
else
dragSession.numberOfItemsToBeAccepted = 1;
if (!dragSession.numberOfItemsToBeAccepted)
dragSession.operation = DragOperationNone;
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(dragSession.numberOfItemsToBeAccepted);
} 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;
}
return true;
}
// We are not over an editable region. Make sure we're clearing any prior drag cursor.
m_page->dragCaretController()->clear();
if (m_fileInputElementUnderMouse)
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = 0;
return false;
}
DragSourceAction DragController::delegateDragSourceAction(const IntPoint& rootViewPoint)
{
m_dragSourceAction = m_client->dragSourceActionMaskForPoint(rootViewPoint);
return m_dragSourceAction;
}
DragOperation DragController::operationForLoad(DragData* dragData)
{
ASSERT(dragData);
Document* doc = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
bool pluginDocumentAcceptsDrags = false;
if (doc && doc->isPluginDocument()) {
const Widget* widget = toPluginDocument(doc)->pluginWidget();
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()))
return DragOperationNone;
return dragOperation(dragData);
}
static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, RefPtr<Range>& range, const IntPoint& point)
{
frame->selection()->setSelection(dragCaret);
if (frame->selection()->isNone()) {
dragCaret = frame->visiblePositionForPoint(point);
frame->selection()->setSelection(dragCaret);
range = dragCaret.toNormalizedRange();
}
return !frame->selection()->isNone() && frame->selection()->isContentEditable();
}
bool DragController::dispatchTextInputEventFor(Frame* innerFrame, DragData* dragData)
{
ASSERT(m_page->dragCaretController()->hasCaret());
String text = m_page->dragCaretController()->isContentRichlyEditable() ? "" : dragData->asPlainText(innerFrame);
Node* target = innerFrame->editor().findEventTargetFrom(m_page->dragCaretController()->caretPosition());
return target->dispatchEvent(TextEvent::createForDrop(innerFrame->document()->domWindow(), text), IGNORE_EXCEPTION);
}
bool DragController::concludeEditDrag(DragData* dragData)
{
ASSERT(dragData);
RefPtr<HTMLInputElement> fileInput = m_fileInputElementUnderMouse;
if (m_fileInputElementUnderMouse) {
m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false);
m_fileInputElementUnderMouse = 0;
}
if (!m_documentUnderMouse)
return false;
IntPoint point = m_documentUnderMouse->view()->windowToContents(dragData->clientPosition());
Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
if (!element)
return false;
RefPtr<Frame> innerFrame = element->ownerDocument()->frame();
ASSERT(innerFrame);
if (m_page->dragCaretController()->hasCaret() && !dispatchTextInputEventFor(innerFrame.get(), dragData))
return true;
if (dragData->containsColor()) {
Color color = dragData->asColor();
if (!color.isValid())
return false;
RefPtr<Range> innerRange = innerFrame->selection()->toNormalizedRange();
RefPtr<MutableStylePropertySet> style = MutableStylePropertySet::create();
style->setProperty(CSSPropertyColor, color.serialized(), false);
if (!innerFrame->editor().shouldApplyStyle(style.get(), innerRange.get()))
return false;
m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
innerFrame->editor().applyStyle(style.get(), EditActionSetColor);
return true;
}
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());
if (fileInput->isDisabledFormControl())
return false;
return fileInput->receiveDroppedFiles(dragData);
}
if (!m_page->dragController()->canProcessDrag(dragData)) {
m_page->dragCaretController()->clear();
return false;
}
VisibleSelection dragCaret = m_page->dragCaretController()->caretPosition();
m_page->dragCaretController()->clear();
RefPtr<Range> range = dragCaret.toNormalizedRange();
RefPtr<Element> rootEditableElement = innerFrame->selection()->rootEditableElement();
// For range to be null a WebKit client must have done something bad while
// manually controlling drag behaviour
if (!range)
return false;
CachedResourceLoader* cachedResourceLoader = range->ownerDocument()->cachedResourceLoader();
ResourceCacheValidationSuppressor validationSuppressor(cachedResourceLoader);
if (dragIsMove(innerFrame->selection(), dragData) || dragCaret.isContentRichlyEditable()) {
bool chosePlainText = false;
RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, innerFrame.get(), range, true, chosePlainText);
if (!fragment || !innerFrame->editor().shouldInsertFragment(fragment, range, EditorInsertActionDropped)) {
return false;
}
m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
if (dragIsMove(innerFrame->selection(), dragData)) {
// NSTextView behavior is to always smart delete on moving a selection,
// but only to smart insert if the selection granularity is word granularity.
bool smartDelete = innerFrame->editor().smartInsertDeleteEnabled();
bool smartInsert = smartDelete && innerFrame->selection()->granularity() == WordGranularity && dragData->canSmartReplace();
applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete));
} else {
if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) {
ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting;
if (dragData->canSmartReplace())
options |= ReplaceSelectionCommand::SmartReplace;
if (chosePlainText)
options |= ReplaceSelectionCommand::MatchStyle;
applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), fragment, options));
}
}
} else {
String text = dragData->asPlainText(innerFrame.get());
if (text.isEmpty() || !innerFrame->editor().shouldInsertText(text, range.get(), EditorInsertActionDropped)) {
return false;
}
m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point))
applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), createFragmentFromText(range.get(), text), ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::MatchStyle | ReplaceSelectionCommand::PreventNesting));
}
if (rootEditableElement) {
if (Frame* frame = rootEditableElement->document()->frame())
frame->eventHandler()->updateDragStateAfterEditDragIfNeeded(rootEditableElement.get());
}
return true;
}
bool DragController::canProcessDrag(DragData* dragData)
{
ASSERT(dragData);
if (!dragData->containsCompatibleContent())
return false;
IntPoint point = m_page->mainFrame()->view()->windowToContents(dragData->clientPosition());
HitTestResult result = HitTestResult(point);
if (!m_page->mainFrame()->contentRenderer())
return false;
result = m_page->mainFrame()->eventHandler()->hitTestResultAtPoint(point, HitTestRequest::ReadOnly | HitTestRequest::Active);
if (!result.innerNonSharedNode())
return false;
if (dragData->containsFiles() && asFileInput(result.innerNonSharedNode()))
return true;
if (result.innerNonSharedNode()->isPluginElement()) {
HTMLPlugInElement* plugin = static_cast<HTMLPlugInElement*>(result.innerNonSharedNode());
if (!plugin->canProcessDrag() && !result.innerNonSharedNode()->rendererIsEditable())
return false;
} else if (!result.innerNonSharedNode()->rendererIsEditable())
return false;
if (m_didInitiateDrag && m_documentUnderMouse == m_dragInitiator && result.isSelected())
return false;
return true;
}
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;
}
bool DragController::tryDHTMLDrag(DragData* dragData, DragOperation& operation)
{
ASSERT(dragData);
ASSERT(m_documentUnderMouse);
RefPtr<Frame> mainFrame = m_page->mainFrame();
RefPtr<FrameView> viewProtector = mainFrame->view();
if (!viewProtector)
return false;
ClipboardAccessPolicy policy = m_documentUnderMouse->securityOrigin()->isLocal() ? ClipboardReadable : ClipboardTypesReadable;
RefPtr<Clipboard> clipboard = Clipboard::create(policy, dragData, mainFrame.get());
DragOperation srcOpMask = dragData->draggingSourceOperationMask();
clipboard->setSourceOperation(srcOpMask);
PlatformMouseEvent event = createMouseEvent(dragData);
if (!mainFrame->eventHandler()->updateDragAndDrop(event, clipboard.get())) {
clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security
return false;
}
operation = clipboard->destinationOperation();
if (clipboard->dropEffectIsUninitialized())
operation = defaultOperationForDrag(srcOpMask);
else if (!(srcOpMask & operation)) {
// The element picked an operation which is not supported by the source
operation = DragOperationNone;
}
clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security
return true;
}
Node* DragController::draggableNode(const Frame* src, Node* startNode, const IntPoint& dragOrigin, DragState& state) const
{
state.m_dragType = (src->selection()->contains(dragOrigin)) ? DragSourceActionSelection : DragSourceActionNone;
for (const RenderObject* renderer = startNode->renderer(); renderer; renderer = renderer->parent()) {
Node* node = renderer->nonPseudoNode();
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;
if (!(state.m_dragType & DragSourceActionSelection) && node->isTextNode() && node->canStartSelection())
// 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()) {
EUserDrag dragMode = renderer->style()->userDrag();
if ((m_dragSourceAction & DragSourceActionDHTML) && dragMode == DRAG_ELEMENT) {
state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionDHTML);
return node;
}
if (dragMode == DRAG_AUTO) {
if ((m_dragSourceAction & DragSourceActionImage)
&& node->hasTagName(HTMLNames::imgTag)
&& src->settings()
&& src->settings()->loadsImagesAutomatically()) {
state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionImage);
return node;
}
if ((m_dragSourceAction & DragSourceActionLink)
&& node->hasTagName(HTMLNames::aTag)
&& static_cast<HTMLAnchorElement*>(node)->isLiveLink()) {
state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionLink);
return node;
}
}
}
}
// We either have nothing to drag or we have a selection and we're not over a draggable element.
return (state.m_dragType & DragSourceActionSelection) ? startNode : 0;
}
static CachedImage* getCachedImage(Element* element)
{
ASSERT(element);
RenderObject* renderer = element->renderer();
if (!renderer || !renderer->isImage())
return 0;
RenderImage* image = toRenderImage(renderer);
return image->cachedImage();
}
static Image* getImage(Element* element)
{
ASSERT(element);
CachedImage* cachedImage = getCachedImage(element);
// 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.
return (cachedImage && !cachedImage->errorOccurred()) ?
cachedImage->image() : 0;
}
static void prepareClipboardForImageDrag(Frame* source, Clipboard* clipboard, Element* node, const KURL& linkURL, const KURL& imageURL, const String& label)
{
if (node->isContentRichlyEditable()) {
RefPtr<Range> range = source->document()->createRange();
range->selectNode(node, ASSERT_NO_EXCEPTION);
source->selection()->setSelection(VisibleSelection(range.get(), DOWNSTREAM));
}
clipboard->declareAndWriteDragImage(node, !linkURL.isEmpty() ? linkURL : imageURL, label, source);
}
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.
#if PLATFORM(MAC)
// We add in the Y dimension because we are a flipped view, so adding moves the image down.
const int yOffset = dragImageOffset.y();
#else
const int yOffset = -dragImageOffset.y();
#endif
if (isLinkImage)
return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset);
return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset);
}
static IntPoint dragLocForSelectionDrag(Frame* src)
{
IntRect draggingRect = enclosingIntRect(src->selection()->bounds());
int xpos = draggingRect.maxX();
xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos;
int ypos = draggingRect.maxY();
#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);
}
bool DragController::startDrag(Frame* src, const DragState& state, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin)
{
ASSERT(src);
if (!src->view() || !src->contentRenderer())
return false;
HitTestResult hitTestResult = src->eventHandler()->hitTestResultAtPoint(dragOrigin, HitTestRequest::ReadOnly | HitTestRequest::Active);
if (!state.m_dragSrc->contains(hitTestResult.innerNode()))
// 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();
IntPoint mouseDraggedPoint = src->view()->windowToContents(dragEvent.position());
m_draggingImageURL = KURL();
m_sourceDragOperation = srcOp;
DragImageRef dragImage = 0;
IntPoint dragLoc(0, 0);
IntPoint dragImageOffset(0, 0);
Clipboard* clipboard = state.m_dragClipboard.get();
if (state.m_dragType == DragSourceActionDHTML)
dragImage = clipboard->createDragImage(dragImageOffset);
if (state.m_dragType == DragSourceActionSelection || !imageURL.isEmpty() || !linkURL.isEmpty())
// Selection, image, and link drags receive a default set of allowed drag operations that
// follows from:
// http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebHTMLView.mm?rev=48526#L3430
m_sourceDragOperation = static_cast<DragOperation>(m_sourceDragOperation | DragOperationGeneric | DragOperationCopy);
// We allow DHTML/JS to set the drag image, even if its a link, image or text we're dragging.
// This is in the spirit of the IE API, which allows overriding of pasteboard data and DragOp.
if (dragImage) {
dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, !linkURL.isEmpty());
m_dragOffset = dragImageOffset;
}
bool startedDrag = true; // optimism - we almost always manage to start the drag
Node* node = state.m_dragSrc.get();
Image* image = node->isElementNode() ? getImage(toElement(node)) : 0;
if (state.m_dragType == DragSourceActionSelection) {
if (!clipboard->hasData()) {
if (enclosingTextFormControl(src->selection()->start()))
clipboard->writePlainText(src->editor().selectedTextForClipboard());
else {
RefPtr<Range> selectionRange = src->selection()->toNormalizedRange();
ASSERT(selectionRange);
clipboard->writeRange(selectionRange.get(), src);
}
}
m_client->willPerformDragSourceAction(DragSourceActionSelection, dragOrigin, clipboard);
if (!dragImage) {
dragImage = dissolveDragImageToFraction(src->dragImageForSelection(), DragImageAlpha);
dragLoc = dragLocForSelectionDrag(src);
m_dragOffset = IntPoint(dragOrigin.x() - dragLoc.x(), dragOrigin.y() - dragLoc.y());
}
doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false);
} else if (!imageURL.isEmpty() && node && node->isElementNode() && image && !image->isNull()
&& (m_dragSourceAction & DragSourceActionImage)) {
// We shouldn't be starting a drag for an image that can't provide an extension.
// This is an early detection for problems encountered later upon drop.
ASSERT(!image->filenameExtension().isEmpty());
Element* element = toElement(node);
if (!clipboard->hasData()) {
m_draggingImageURL = imageURL;
prepareClipboardForImageDrag(src, clipboard, element, linkURL, imageURL, hitTestResult.altDisplayString());
}
m_client->willPerformDragSourceAction(DragSourceActionImage, dragOrigin, clipboard);
if (!dragImage) {
IntRect imageRect = hitTestResult.imageRect();
imageRect.setLocation(m_page->mainFrame()->view()->rootViewToContents(src->view()->contentsToRootView(imageRect.location())));
doImageDrag(element, dragOrigin, hitTestResult.imageRect(), clipboard, src, m_dragOffset);
} else
// DHTML defined drag image
doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false);
} else if (!linkURL.isEmpty() && (m_dragSourceAction & DragSourceActionLink)) {
if (!clipboard->hasData())
// Simplify whitespace so the title put on the clipboard resembles what the user sees
// on the web page. This includes replacing newlines with spaces.
clipboard->writeURL(linkURL, hitTestResult.textContent().simplifyWhiteSpace(), src);
if (src->selection()->isCaret() && src->selection()->isContentEditable()) {
// a user can initiate a drag on a link without having any text
// selected. In this case, we should expand the selection to
// the enclosing anchor element
Position pos = src->selection()->base();
Node* node = enclosingAnchorElement(pos);
if (node)
src->selection()->setSelection(VisibleSelection::selectionFromContentsOfNode(node));
}
m_client->willPerformDragSourceAction(DragSourceActionLink, dragOrigin, clipboard);
if (!dragImage) {
dragImage = createDragImageForLink(linkURL, hitTestResult.textContent(), src->settings() ? src->settings()->fontRenderingMode() : NormalRenderingMode);
IntSize size = dragImageSize(dragImage);
m_dragOffset = IntPoint(-size.width() / 2, -LinkDragBorderInset);
dragLoc = IntPoint(mouseDraggedPoint.x() + m_dragOffset.x(), mouseDraggedPoint.y() + m_dragOffset.y());
}
doSystemDrag(dragImage, dragLoc, mouseDraggedPoint, clipboard, src, true);
} else if (state.m_dragType == DragSourceActionDHTML) {
ASSERT(m_dragSourceAction & DragSourceActionDHTML);
m_client->willPerformDragSourceAction(DragSourceActionDHTML, dragOrigin, clipboard);
doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false);
} else {
// draggableNode() determined an image or link node was draggable, but it turns out the
// image or link had no URL, so there is nothing to drag.
startedDrag = false;
}
if (dragImage)
deleteDragImage(dragImage);
return startedDrag;
}
void DragController::doImageDrag(Element* element, const IntPoint& dragOrigin, const IntRect& rect, Clipboard* clipboard, Frame* frame, IntPoint& dragImageOffset)
{
IntPoint mouseDownPoint = dragOrigin;
DragImageRef dragImage = 0;
IntPoint origin;
Image* image = getImage(element);
if (image && image->size().height() * image->size().width() <= MaxOriginalImageArea
&& (dragImage = createDragImageFromImage(image, element->renderer() ? element->renderer()->shouldRespectImageOrientation() : DoNotRespectImageOrientation))) {
IntSize originalSize = rect.size();
origin = rect.location();
dragImage = fitDragImageToMaxSize(dragImage, rect.size(), maxDragImageSize());
dragImage = dissolveDragImageToFraction(dragImage, DragImageAlpha);
IntSize newSize = dragImageSize(dragImage);
// Properly orient the drag image and orient it differently if it's smaller than the original
float scale = newSize.width() / (float)originalSize.width();
float dx = origin.x() - mouseDownPoint.x();
dx *= scale;
origin.setX((int)(dx + 0.5));
#if PLATFORM(MAC)
//Compensate for accursed flipped coordinates in cocoa
origin.setY(origin.y() + originalSize.height());
#endif
float dy = origin.y() - mouseDownPoint.y();
dy *= scale;
origin.setY((int)(dy + 0.5));
} else {
if (CachedImage* cachedImage = getCachedImage(element)) {
dragImage = createDragImageIconForCachedImageFilename(cachedImage->response().suggestedFilename());
if (dragImage)
origin = IntPoint(DragIconRightInset - dragImageSize(dragImage).width(), DragIconBottomInset);
}
}
dragImageOffset = mouseDownPoint + origin;
doSystemDrag(dragImage, dragImageOffset, dragOrigin, clipboard, frame, false);
deleteDragImage(dragImage);
}
void DragController::doSystemDrag(DragImageRef image, const IntPoint& dragLoc, const IntPoint& eventPos, Clipboard* clipboard, Frame* frame, bool forLink)
{
m_didInitiateDrag = true;
m_dragInitiator = frame->document();
// Protect this frame and view, as a load may occur mid drag and attempt to unload this frame
RefPtr<Frame> frameProtector = m_page->mainFrame();
RefPtr<FrameView> viewProtector = frameProtector->view();
m_client->startDrag(image, viewProtector->rootViewToContents(frame->view()->contentsToRootView(dragLoc)),
viewProtector->rootViewToContents(frame->view()->contentsToRootView(eventPos)), clipboard, frameProtector.get(), forLink);
// DragClient::startDrag can cause our Page to dispear, deallocating |this|.
if (!frameProtector->page())
return;
cleanupAfterSystemDrag();
}
// Manual drag caret manipulation
void DragController::placeDragCaret(const IntPoint& windowPoint)
{
mouseMovedIntoDocument(m_page->mainFrame()->documentAtPoint(windowPoint));
if (!m_documentUnderMouse)
return;
Frame* frame = m_documentUnderMouse->frame();
FrameView* frameView = frame->view();
if (!frameView)
return;
IntPoint framePoint = frameView->windowToContents(windowPoint);
m_page->dragCaretController()->setCaretPosition(frame->visiblePositionForPoint(framePoint));
}
} // namespace WebCore
#endif // ENABLE(DRAG_SUPPORT)