| /* |
| * 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 "CachedResourceLoader.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 "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; |
| 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, 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); |
| 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(frame)).get(); |
| } |
| |
| return 0; |
| } |
| |
| bool DragController::dragIsMove(SelectionController* selection, DragData* dragData) |
| { |
| return m_documentUnderMouse == m_dragInitiator && selection->isContentEditable() && !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(); |
| } |
| |
| 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 = 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); |
| } |
| |
| 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 = Clipboard::create(ClipboardReadable, dragData, mainFrame.get()); |
| 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(m_page->mainFrame())), 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->isShadowRoot() && !static_cast<HTMLInputElement*>(node)->isFileUpload()) |
| node = node->shadowHost(); |
| |
| if (!node || !node->hasTagName(HTMLNames::inputTag)) |
| return 0; |
| |
| HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node); |
| if (!inputElement->isFileUpload()) |
| return 0; |
| |
| return inputElement; |
| } |
| |
| // 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; |
| 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(); |
| |
| return static_cast<Element*>(n); |
| } |
| |
| bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragOperation& operation) |
| { |
| ASSERT(dragData); |
| |
| if (!m_documentUnderMouse) |
| return false; |
| |
| if (m_dragInitiator && !m_documentUnderMouse->securityOrigin()->canReceiveDragData(m_dragInitiator->securityOrigin())) |
| 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 (!element) |
| return false; |
| if (!asFileInput(element)) { |
| VisibleSelection dragCaret = m_documentUnderMouse->frame()->visiblePositionForPoint(point); |
| m_page->dragCaretController()->setSelection(dragCaret); |
| } |
| |
| Frame* innerFrame = element->document()->frame(); |
| operation = dragIsMove(innerFrame->selection(), dragData) ? 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->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()->isNone()); |
| VisibleSelection dragCaret(m_page->dragCaretController()->selection()); |
| String text = dragCaret.isContentRichlyEditable() ? "" : dragData->asPlainText(innerFrame); |
| Node* target = innerFrame->editor()->findEventTargetFrom(dragCaret); |
| ExceptionCode ec = 0; |
| return target->dispatchEvent(TextEvent::createForDrop(innerFrame->domWindow(), text), ec); |
| } |
| |
| 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); |
| if (!element) |
| return false; |
| Frame* innerFrame = element->ownerDocument()->frame(); |
| ASSERT(innerFrame); |
| |
| if (!m_page->dragCaretController()->isNone() && !dispatchTextInputEventFor(innerFrame, dragData)) |
| return true; |
| |
| if (dragData->containsColor()) { |
| Color color = dragData->asColor(); |
| if (!color.isValid()) |
| return false; |
| RefPtr<Range> innerRange = innerFrame->selection()->toNormalizedRange(); |
| RefPtr<CSSStyleDeclaration> style = m_documentUnderMouse->createCSSStyleDeclaration(); |
| ExceptionCode ec; |
| style->setProperty("color", color.serialized(), 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; |
| CachedResourceLoader* cachedResourceLoader = range->ownerDocument()->cachedResourceLoader(); |
| cachedResourceLoader->setAllowStaleResources(true); |
| if (dragIsMove(innerFrame->selection(), dragData) || dragCaret.isContentRichlyEditable()) { |
| bool chosePlainText = false; |
| RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, innerFrame, range, true, chosePlainText); |
| if (!fragment || !innerFrame->editor()->shouldInsertFragment(fragment, range, EditorInsertActionDropped)) { |
| cachedResourceLoader->setAllowStaleResources(false); |
| 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, 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); |
| if (text.isEmpty() || !innerFrame->editor()->shouldInsertText(text, range.get(), EditorInsertActionDropped)) { |
| cachedResourceLoader->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), ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::MatchStyle | ReplaceSelectionCommand::PreventNesting)); |
| } |
| cachedResourceLoader->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()->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; |
| } |
| |
| 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->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, 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 = 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().deprecatedNode())) |
| clipboard->writePlainText(src->editor()->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) |
