--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/page/DragController.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,834 @@
+/*
+ * 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 "CSSStyleDeclaration.h"
+#include "Clipboard.h"
+#include "ClipboardAccessPolicy.h"
+#include "DocLoader.h"
+#include "Document.h"
+#include "DocumentFragment.h"
+#include "DragActions.h"
+#include "DragClient.h"
+#include "DragData.h"
+#include "Editor.h"
+#include "EditorClient.h"
+#include "Element.h"
+#include "EventHandler.h"
+#include "FloatRect.h"
+#include "Frame.h"
+#include "FrameLoader.h"
+#include "FrameView.h"
+#include "HTMLAnchorElement.h"
+#include "HTMLInputElement.h"
+#include "HTMLNames.h"
+#include "HitTestRequest.h"
+#include "HitTestResult.h"
+#include "Image.h"
+#include "MoveSelectionCommand.h"
+#include "Node.h"
+#include "Page.h"
+#include "PlatformKeyboardEvent.h"
+#include "RenderFileUploadControl.h"
+#include "RenderImage.h"
+#include "RenderLayer.h"
+#include "RenderView.h"
+#include "ReplaceSelectionCommand.h"
+#include "ResourceRequest.h"
+#include "SelectionController.h"
+#include "Settings.h"
+#include "Text.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;
+ PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
+ return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(),
+ LeftButton, MouseEventMoved, 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_dragDestinationAction(DragDestinationActionNone)
+ , m_dragSourceAction(DragSourceActionNone)
+ , m_didInitiateDrag(false)
+ , m_isHandlingDrag(false)
+ , m_sourceDragOperation(DragOperationNone)
+{
+}
+
+DragController::~DragController()
+{
+ m_client->dragControllerDestroyed();
+}
+
+static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragData, 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(document))
+ return fragment;
+
+ if (dragData->containsURL(DragData::DoNotConvertFilenames)) {
+ String title;
+ String url = dragData->asURL(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();
+ if (title.isEmpty())
+ title = url;
+ }
+ RefPtr<Node> anchorText = document->createTextNode(title);
+ ExceptionCode ec;
+ anchor->appendChild(anchorText, ec);
+ RefPtr<DocumentFragment> fragment = document->createDocumentFragment();
+ fragment->appendChild(anchor, ec);
+ return fragment.get();
+ }
+ }
+ }
+ if (allowPlainText && dragData->containsPlainText()) {
+ chosePlainText = true;
+ return createFragmentFromText(context.get(), dragData->asPlainText()).get();
+ }
+
+ return 0;
+}
+
+bool DragController::dragIsMove(SelectionController* selection)
+{
+ return m_documentUnderMouse == m_dragInitiator && selection->isContentEditable() && !isCopyKeyDown();
+}
+
+// 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();
+}
+
+DragOperation 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 = dragData->createClipboard(policy);
+ clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
+ mainFrame->eventHandler()->cancelDragAndDrop(createMouseEvent(dragData), clipboard.get());
+ clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security
+ }
+ mouseMovedIntoDocument(0);
+}
+
+DragOperation DragController::dragUpdated(DragData* dragData)
+{
+ return dragEnteredOrUpdated(dragData);
+}
+
+bool DragController::performDrag(DragData* dragData)
+{
+ ASSERT(dragData);
+ m_documentUnderMouse = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
+ if (m_isHandlingDrag) {
+ ASSERT(m_dragDestinationAction & DragDestinationActionDHTML);
+ m_client->willPerformDragDestinationAction(DragDestinationActionDHTML, dragData);
+ RefPtr<Frame> mainFrame = m_page->mainFrame();
+ if (mainFrame->view()) {
+ // Sending an event can result in the destruction of the view and part.
+ RefPtr<Clipboard> clipboard = dragData->createClipboard(ClipboardReadable);
+ clipboard->setSourceOperation(dragData->draggingSourceOperationMask());
+ mainFrame->eventHandler()->performDragAndDrop(createMouseEvent(dragData), clipboard.get());
+ clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security
+ }
+ 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()), false);
+ 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;
+}
+
+DragOperation 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 DragOperationNone;
+ }
+
+ DragOperation operation = DragOperationNone;
+ bool handledByDocument = tryDocumentDrag(dragData, m_dragDestinationAction, operation);
+ if (!handledByDocument && (m_dragDestinationAction & DragDestinationActionLoad))
+ return operationForLoad(dragData);
+ return operation;
+}
+
+static HTMLInputElement* asFileInput(Node* node)
+{
+ ASSERT(node);
+
+ // The button for a FILE input is a sub element with no set input type
+ // In order to get around this problem we assume any non-FILE input element
+ // is this internal button, and try querying the shadow parent node.
+ if (node->hasTagName(HTMLNames::inputTag) && node->isShadowNode() && static_cast<HTMLInputElement*>(node)->inputType() != HTMLInputElement::FILE)
+ node = node->shadowParentNode();
+
+ if (!node || !node->hasTagName(HTMLNames::inputTag))
+ return 0;
+
+ HTMLInputElement* inputElem = static_cast<HTMLInputElement*>(node);
+ if (inputElem->inputType() == HTMLInputElement::FILE)
+ return inputElem;
+
+ return 0;
+}
+
+static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p)
+{
+ FrameView* view = documentUnderMouse->view();
+ float zoomFactor = view ? view->pageZoomFactor() : 1;
+ IntPoint point = roundedIntPoint(FloatPoint(p.x() * zoomFactor, p.y() * zoomFactor));
+
+ HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
+ HitTestResult result(point);
+ documentUnderMouse->renderView()->layer()->hitTest(request, result);
+
+ Node* n = result.innerNode();
+ while (n && !n->isElementNode())
+ n = n->parentNode();
+ if (n)
+ n = n->shadowAncestorNode();
+
+ ASSERT(n);
+ return static_cast<Element*>(n);
+}
+
+bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragOperation& operation)
+{
+ ASSERT(dragData);
+
+ if (!m_documentUnderMouse)
+ return false;
+
+ m_isHandlingDrag = false;
+ if (actionMask & DragDestinationActionDHTML) {
+ m_isHandlingDrag = tryDHTMLDrag(dragData, 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 (m_isHandlingDrag) {
+ m_page->dragCaretController()->clear();
+ return true;
+ } else if ((actionMask & DragDestinationActionEdit) && canProcessDrag(dragData)) {
+ if (dragData->containsColor()) {
+ operation = DragOperationGeneric;
+ return true;
+ }
+
+ IntPoint point = frameView->windowToContents(dragData->clientPosition());
+ Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
+ if (!asFileInput(element)) {
+ VisibleSelection dragCaret = m_documentUnderMouse->frame()->visiblePositionForPoint(point);
+ m_page->dragCaretController()->setSelection(dragCaret);
+ }
+
+ Frame* innerFrame = element->document()->frame();
+ operation = dragIsMove(innerFrame->selection()) ? DragOperationMove : DragOperationCopy;
+ return true;
+ }
+ // If we're not over an editable region, make sure we're clearing any prior drag cursor.
+ m_page->dragCaretController()->clear();
+ return false;
+}
+
+DragSourceAction DragController::delegateDragSourceAction(const IntPoint& windowPoint)
+{
+ m_dragSourceAction = m_client->dragSourceActionMaskForPoint(windowPoint);
+ return m_dragSourceAction;
+}
+
+DragOperation DragController::operationForLoad(DragData* dragData)
+{
+ ASSERT(dragData);
+ Document* doc = m_page->mainFrame()->documentAtPoint(dragData->clientPosition());
+ if (doc && (m_didInitiateDrag || doc->isPluginDocument() || (doc->frame() && doc->frame()->editor()->clientIsEditable())))
+ 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::concludeEditDrag(DragData* dragData)
+{
+ ASSERT(dragData);
+ ASSERT(!m_isHandlingDrag);
+
+ if (!m_documentUnderMouse)
+ return false;
+
+ IntPoint point = m_documentUnderMouse->view()->windowToContents(dragData->clientPosition());
+ Element* element = elementUnderMouse(m_documentUnderMouse.get(), point);
+ Frame* innerFrame = element->ownerDocument()->frame();
+ ASSERT(innerFrame);
+
+ if (dragData->containsColor()) {
+ Color color = dragData->asColor();
+ if (!color.isValid())
+ return false;
+ if (!innerFrame)
+ return false;
+ RefPtr<Range> innerRange = innerFrame->selection()->toNormalizedRange();
+ RefPtr<CSSStyleDeclaration> style = m_documentUnderMouse->createCSSStyleDeclaration();
+ ExceptionCode ec;
+ style->setProperty("color", color.name(), ec);
+ if (!innerFrame->editor()->shouldApplyStyle(style.get(), innerRange.get()))
+ return false;
+ m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
+ innerFrame->editor()->applyStyle(style.get(), EditActionSetColor);
+ return true;
+ }
+
+ if (!m_page->dragController()->canProcessDrag(dragData)) {
+ m_page->dragCaretController()->clear();
+ return false;
+ }
+
+ if (HTMLInputElement* fileInput = asFileInput(element)) {
+ if (fileInput->disabled())
+ return false;
+
+ if (!dragData->containsFiles())
+ return false;
+
+ Vector<String> filenames;
+ dragData->asFilenames(filenames);
+ if (filenames.isEmpty())
+ return false;
+
+ // Ugly. For security none of the APIs available to us can set the input value
+ // on file inputs. Even forcing a change in HTMLInputElement doesn't work as
+ // RenderFileUploadControl clears the file when doing updateFromElement().
+ RenderFileUploadControl* renderer = toRenderFileUploadControl(fileInput->renderer());
+ if (!renderer)
+ return false;
+
+ renderer->receiveDroppedFiles(filenames);
+ return true;
+ }
+
+ VisibleSelection dragCaret(m_page->dragCaretController()->selection());
+ m_page->dragCaretController()->clear();
+ RefPtr<Range> range = dragCaret.toNormalizedRange();
+
+ // For range to be null a WebKit client must have done something bad while
+ // manually controlling drag behaviour
+ if (!range)
+ return false;
+ DocLoader* loader = range->ownerDocument()->docLoader();
+ loader->setAllowStaleResources(true);
+ if (dragIsMove(innerFrame->selection()) || dragCaret.isContentRichlyEditable()) {
+ bool chosePlainText = false;
+ RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, range, true, chosePlainText);
+ if (!fragment || !innerFrame->editor()->shouldInsertFragment(fragment, range, EditorInsertActionDropped)) {
+ loader->setAllowStaleResources(false);
+ return false;
+ }
+
+ m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
+ if (dragIsMove(innerFrame->selection())) {
+ // 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->selectionGranularity() == WordGranularity && dragData->canSmartReplace();
+ applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete));
+ } else {
+ if (setSelectionToDragCaret(innerFrame, dragCaret, range, point))
+ applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), fragment, true, dragData->canSmartReplace(), chosePlainText));
+ }
+ } else {
+ String text = dragData->asPlainText();
+ if (text.isEmpty() || !innerFrame->editor()->shouldInsertText(text, range.get(), EditorInsertActionDropped)) {
+ loader->setAllowStaleResources(false);
+ return false;
+ }
+
+ m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData);
+ if (setSelectionToDragCaret(innerFrame, dragCaret, range, point))
+ applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), createFragmentFromText(range.get(), text), true, false, true));
+ }
+ loader->setAllowStaleResources(false);
+
+ 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, true);
+
+ if (!result.innerNonSharedNode())
+ return false;
+
+ if (dragData->containsFiles() && asFileInput(result.innerNonSharedNode()))
+ return true;
+
+ if (!result.innerNonSharedNode()->isContentEditable())
+ 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 = dragData->createClipboard(policy);
+ 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;
+}
+
+bool DragController::mayStartDragAtEventLocation(const Frame* frame, const IntPoint& framePos, Node* node)
+{
+ ASSERT(frame);
+ ASSERT(frame->settings());
+
+ if (!frame->view() || !frame->contentRenderer())
+ return false;
+
+ HitTestResult mouseDownTarget = HitTestResult(framePos);
+
+ mouseDownTarget = frame->eventHandler()->hitTestResultAtPoint(framePos, true);
+ if (node)
+ mouseDownTarget.setInnerNonSharedNode(node);
+
+ if (mouseDownTarget.image()
+ && !mouseDownTarget.absoluteImageURL().isEmpty()
+ && frame->settings()->loadsImagesAutomatically()
+ && m_dragSourceAction & DragSourceActionImage)
+ return true;
+
+ if (!mouseDownTarget.absoluteLinkURL().isEmpty()
+ && m_dragSourceAction & DragSourceActionLink
+ && mouseDownTarget.isLiveLink()
+ && mouseDownTarget.URLElement()->renderer() && mouseDownTarget.URLElement()->renderer()->style()->userDrag() != DRAG_NONE)
+ return true;
+
+ if (mouseDownTarget.isSelected()
+ && m_dragSourceAction & DragSourceActionSelection)
+ return true;
+
+ return false;
+}
+
+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);
+ return (cachedImage && !cachedImage->errorOccurred()) ?
+ cachedImage->image() : 0;
+}
+
+static void prepareClipboardForImageDrag(Frame* src, Clipboard* clipboard, Element* node, const KURL& linkURL, const KURL& imageURL, const String& label)
+{
+ RefPtr<Range> range = src->document()->createRange();
+ ExceptionCode ec = 0;
+ range->selectNode(node, ec);
+ ASSERT(!ec);
+ src->selection()->setSelection(VisibleSelection(range.get(), DOWNSTREAM));
+ clipboard->declareAndWriteDragImage(node, !linkURL.isEmpty() ? linkURL : imageURL, label, src);
+}
+
+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->selectionBounds());
+ int xpos = draggingRect.right();
+ xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos;
+ int ypos = draggingRect.bottom();
+#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, Clipboard* clipboard, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin, bool isDHTMLDrag)
+{
+ ASSERT(src);
+ ASSERT(clipboard);
+
+ if (!src->view() || !src->contentRenderer())
+ return false;
+
+ HitTestResult dragSource = HitTestResult(dragOrigin);
+ dragSource = src->eventHandler()->hitTestResultAtPoint(dragOrigin, true);
+ KURL linkURL = dragSource.absoluteLinkURL();
+ KURL imageURL = dragSource.absoluteImageURL();
+ bool isSelected = dragSource.isSelected();
+
+ IntPoint mouseDraggedPoint = src->view()->windowToContents(dragEvent.pos());
+
+ m_draggingImageURL = KURL();
+ m_sourceDragOperation = srcOp;
+
+ DragImageRef dragImage = 0;
+ IntPoint dragLoc(0, 0);
+ IntPoint dragImageOffset(0, 0);
+
+ if (isDHTMLDrag)
+ dragImage = clipboard->createDragImage(dragImageOffset);
+ else {
+ // This drag operation is not a DHTML drag and may go outside the WebView.
+ // We provide 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 = (DragOperation)(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 = dragSource.innerNonSharedNode();
+
+ Image* image = getImage(static_cast<Element*>(node));
+ if (!imageURL.isEmpty() && node && node->isElementNode() && image
+ && (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 = static_cast<Element*>(node);
+ if (!clipboard->hasData()) {
+ m_draggingImageURL = imageURL;
+ prepareClipboardForImageDrag(src, clipboard, element, linkURL, imageURL, dragSource.altDisplayString());
+ }
+
+ m_client->willPerformDragSourceAction(DragSourceActionImage, dragOrigin, clipboard);
+
+ if (!dragImage) {
+ IntRect imageRect = dragSource.imageRect();
+ imageRect.setLocation(m_page->mainFrame()->view()->windowToContents(src->view()->contentsToWindow(imageRect.location())));
+ doImageDrag(element, dragOrigin, dragSource.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, dragSource.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 = m_client->createDragImageForLink(linkURL, dragSource.textContent(), src);
+ 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 (isSelected && (m_dragSourceAction & DragSourceActionSelection)) {
+ if (!clipboard->hasData()) {
+ if (isNodeInTextFormControl(src->selection()->start().node()))
+ clipboard->writePlainText(src->selectedText());
+ else {
+ RefPtr<Range> selectionRange = src->selection()->toNormalizedRange();
+ ASSERT(selectionRange);
+
+ clipboard->writeRange(selectionRange.get(), src);
+ }
+ }
+ m_client->willPerformDragSourceAction(DragSourceActionSelection, dragOrigin, clipboard);
+ if (!dragImage) {
+ dragImage = createDragImageForSelection(src);
+ dragLoc = dragLocForSelectionDrag(src);
+ m_dragOffset = IntPoint((int)(dragOrigin.x() - dragLoc.x()), (int)(dragOrigin.y() - dragLoc.y()));
+ }
+ doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false);
+ } else if (isDHTMLDrag) {
+ ASSERT(m_dragSourceAction & DragSourceActionDHTML);
+ m_client->willPerformDragSourceAction(DragSourceActionDHTML, dragOrigin, clipboard);
+ doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false);
+ } else {
+ // Only way I know to get here is if to get here is if the original element clicked on in the mousedown is no longer
+ // under the mousedown point, so linkURL, imageURL and isSelected are all false/empty.
+ 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;
+ IntPoint origin;
+
+ Image* image = getImage(element);
+ if (image && image->size().height() * image->size().width() <= MaxOriginalImageArea
+ && (dragImage = createDragImageFromImage(image))) {
+ 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 {
+ dragImage = createDragImageIconForCachedImage(getCachedImage(element));
+ if (dragImage)
+ origin = IntPoint(DragIconRightInset - dragImageSize(dragImage).width(), DragIconBottomInset);
+ }
+
+ dragImageOffset.setX(mouseDownPoint.x() + origin.x());
+ dragImageOffset.setY(mouseDownPoint.y() + origin.y());
+ 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->windowToContents(frame->view()->contentsToWindow(dragLoc)),
+ viewProtector->windowToContents(frame->view()->contentsToWindow(eventPos)), clipboard, frameProtector.get(), forLink);
+
+ 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);
+ VisibleSelection dragCaret(frame->visiblePositionForPoint(framePoint));
+ m_page->dragCaretController()->setSelection(dragCaret);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(DRAG_SUPPORT)