| /* |
| * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Google Inc. |
| * |
| * 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 "core/page/DragController.h" |
| |
| #include "HTMLNames.h" |
| #include "bindings/v8/ExceptionStatePlaceholder.h" |
| #include "core/dom/Clipboard.h" |
| #include "core/dom/ClipboardAccessPolicy.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/DocumentFragment.h" |
| #include "core/dom/Element.h" |
| #include "core/dom/Node.h" |
| #include "core/dom/Text.h" |
| #include "core/dom/TextEvent.h" |
| #include "core/dom/shadow/ShadowRoot.h" |
| #include "core/editing/Editor.h" |
| #include "core/editing/FrameSelection.h" |
| #include "core/editing/MoveSelectionCommand.h" |
| #include "core/editing/ReplaceSelectionCommand.h" |
| #include "core/editing/htmlediting.h" |
| #include "core/editing/markup.h" |
| #include "core/html/HTMLAnchorElement.h" |
| #include "core/html/HTMLFormElement.h" |
| #include "core/html/HTMLInputElement.h" |
| #include "core/html/HTMLPlugInElement.h" |
| #include "core/loader/FrameLoadRequest.h" |
| #include "core/loader/FrameLoader.h" |
| #include "core/loader/cache/ImageResource.h" |
| #include "core/loader/cache/ResourceFetcher.h" |
| #include "core/page/DragActions.h" |
| #include "core/page/DragClient.h" |
| #include "core/page/DragSession.h" |
| #include "core/page/DragState.h" |
| #include "core/page/EventHandler.h" |
| #include "core/page/Frame.h" |
| #include "core/page/FrameView.h" |
| #include "core/page/Page.h" |
| #include "core/page/Settings.h" |
| #include "core/platform/DragData.h" |
| #include "core/platform/DragImage.h" |
| #include "core/platform/graphics/FloatRect.h" |
| #include "core/platform/graphics/Image.h" |
| #include "core/platform/graphics/ImageOrientation.h" |
| #include "core/platform/network/ResourceRequest.h" |
| #include "core/rendering/HitTestRequest.h" |
| #include "core/rendering/HitTestResult.h" |
| #include "core/rendering/RenderImage.h" |
| #include "core/rendering/RenderTheme.h" |
| #include "core/rendering/RenderView.h" |
| #include "weborigin/SecurityOrigin.h" |
| #include "wtf/CurrentTime.h" |
| #include "wtf/OwnPtr.h" |
| #include "wtf/PassOwnPtr.h" |
| #include "wtf/RefPtr.h" |
| |
| #if OS(WINDOWS) |
| #include <windows.h> |
| #endif |
| |
| namespace WebCore { |
| |
| const int DragController::DragIconRightInset = 7; |
| const int DragController::DragIconBottomInset = 3; |
| |
| static const int MaxOriginalImageArea = 1500 * 1500; |
| static const int LinkDragBorderInset = 2; |
| static const float DragImageAlpha = 0.75f; |
| |
| static bool dragTypeIsValid(DragSourceAction action) |
| { |
| switch (action) { |
| case DragSourceActionDHTML: |
| case DragSourceActionImage: |
| case DragSourceActionLink: |
| case DragSourceActionSelection: |
| return true; |
| case DragSourceActionNone: |
| return false; |
| } |
| // Make sure MSVC doesn't complain that not all control paths return a value. |
| return false; |
| } |
| |
| 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_didInitiateDrag(false) |
| { |
| ASSERT(m_client); |
| } |
| |
| DragController::~DragController() |
| { |
| } |
| |
| 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(); |
| } |
| |
| 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) { |
| 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_page->mainFrame()->loader()->load(FrameLoadRequest(0, 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); |
| |
| if (!node->hasTagName(HTMLNames::inputTag)) |
| return 0; |
| HTMLInputElement* inputElement = toHTMLInputElement(node); |
| // If this is a button inside of the a file input, move up to the file input. |
| if (inputElement->isTextButton() && inputElement->treeScope()->rootNode()->isShadowRoot()) { |
| Element* host = toShadowRoot(inputElement->treeScope()->rootNode())->host(); |
| if (!host->hasTagName(HTMLNames::inputTag)) |
| return 0; |
| inputElement = toHTMLInputElement(host); |
| } |
| |
| return 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)) { |
| 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; |
| } |
| |
| 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().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->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->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; |
| ResourceFetcher* fetcher = range->ownerDocument()->fetcher(); |
| ResourceCacheValidationSuppressor validationSuppressor(fetcher); |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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); |
| |
| 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 (dragMode == DRAG_NONE) |
| continue; |
| if (renderer->isImage() |
| && src->settings() |
| && src->settings()->loadsImagesAutomatically()) { |
| state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionImage); |
| return node; |
| } |
| if (isHTMLAnchorElement(node) |
| && toHTMLAnchorElement(node)->isLiveLink()) { |
| state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionLink); |
| return node; |
| } |
| if (dragMode == DRAG_ELEMENT) { |
| state.m_dragType = static_cast<DragSourceAction>(state.m_dragType | DragSourceActionDHTML); |
| 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 ImageResource* getImageResource(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); |
| ImageResource* cachedImage = getImageResource(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); |
| } |
| |
| bool DragController::populateDragClipboard(Frame* src, const DragState& state, const IntPoint& dragOrigin) |
| { |
| ASSERT(dragTypeIsValid(state.m_dragType)); |
| ASSERT(src); |
| if (!src->view() || !src->contentRenderer()) |
| return false; |
| |
| HitTestResult hitTestResult = src->eventHandler()->hitTestResultAtPoint(dragOrigin, HitTestRequest::ReadOnly | HitTestRequest::Active); |
| // FIXME: Can this even happen? I guess it's possible, but should verify |
| // with a layout test. |
| 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; |
| } |
| const KURL& linkURL = hitTestResult.absoluteLinkURL(); |
| const KURL& imageURL = hitTestResult.absoluteImageURL(); |
| |
| Clipboard* clipboard = state.m_dragClipboard.get(); |
| Node* node = state.m_dragSrc.get(); |
| |
| if (state.m_dragType == DragSourceActionSelection) { |
| if (enclosingTextFormControl(src->selection()->start())) { |
| clipboard->writePlainText(src->selectedTextForClipboard()); |
| } else { |
| RefPtr<Range> selectionRange = src->selection()->toNormalizedRange(); |
| ASSERT(selectionRange); |
| |
| clipboard->writeRange(selectionRange.get(), src); |
| } |
| } else if (state.m_dragType == DragSourceActionImage) { |
| if (imageURL.isEmpty() || !node || !node->isElementNode()) |
| return false; |
| Element* element = toElement(node); |
| prepareClipboardForImageDrag(src, clipboard, element, linkURL, imageURL, hitTestResult.altDisplayString()); |
| } else if (state.m_dragType == DragSourceActionLink) { |
| if (linkURL.isEmpty()) |
| return false; |
| // 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); |
| } |
| // FIXME: For DHTML/draggable element drags, write element markup to clipboard. |
| return true; |
| } |
| |
| static IntPoint dragLocationForDHTMLDrag(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. |
| const int yOffset = -dragImageOffset.y(); |
| |
| if (isLinkImage) |
| return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset); |
| |
| return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset); |
| } |
| |
| static IntPoint dragLocationForSelectionDrag(Frame* sourceFrame) |
| { |
| IntRect draggingRect = enclosingIntRect(sourceFrame->selection()->bounds()); |
| int xpos = draggingRect.maxX(); |
| xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos; |
| int ypos = draggingRect.maxY(); |
| ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos; |
| return IntPoint(xpos, ypos); |
| } |
| |
| static const IntSize& maxDragImageSize() |
| { |
| #if OS(DARWIN) |
| // Match Safari's drag image size. |
| static const IntSize maxDragImageSize(400, 400); |
| #else |
| static const IntSize maxDragImageSize(200, 200); |
| #endif |
| return maxDragImageSize; |
| } |
| |
| static PassOwnPtr<DragImage> dragImageForImage(Element* element, Image* image, const IntPoint& dragOrigin, const IntRect& imageRect, IntPoint& dragLocation) |
| { |
| OwnPtr<DragImage> dragImage; |
| IntPoint origin; |
| |
| if (image->size().height() * image->size().width() <= MaxOriginalImageArea |
| && (dragImage = DragImage::create(image, element->renderer() ? element->renderer()->shouldRespectImageOrientation() : DoNotRespectImageOrientation))) { |
| IntSize originalSize = imageRect.size(); |
| origin = imageRect.location(); |
| |
| dragImage->fitToMaxSize(imageRect.size(), maxDragImageSize()); |
| dragImage->dissolveToFraction(DragImageAlpha); |
| IntSize newSize = dragImage->size(); |
| |
| // 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() - dragOrigin.x(); |
| dx *= scale; |
| origin.setX((int)(dx + 0.5)); |
| float dy = origin.y() - dragOrigin.y(); |
| dy *= scale; |
| origin.setY((int)(dy + 0.5)); |
| } |
| |
| dragLocation = dragOrigin + origin; |
| return dragImage.release(); |
| } |
| |
| static PassOwnPtr<DragImage> dragImageForLink(const KURL& linkURL, const String& linkText, float deviceScaleFactor, const IntPoint& mouseDraggedPoint, IntPoint& dragLoc) |
| { |
| FontDescription fontDescription; |
| RenderTheme::defaultTheme()->systemFont(WebCore::CSSValueNone, fontDescription); |
| OwnPtr<DragImage> dragImage = DragImage::create(linkURL, linkText, fontDescription, deviceScaleFactor); |
| |
| IntSize size = dragImage ? dragImage->size() : IntSize(); |
| IntPoint dragImageOffset(-size.width() / 2, -LinkDragBorderInset); |
| dragLoc = IntPoint(mouseDraggedPoint.x() + dragImageOffset.x(), mouseDraggedPoint.y() + dragImageOffset.y()); |
| |
| return dragImage.release(); |
| } |
| |
| bool DragController::startDrag(Frame* src, const DragState& state, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin) |
| { |
| ASSERT(dragTypeIsValid(state.m_dragType)); |
| ASSERT(src); |
| if (!src->view() || !src->contentRenderer()) |
| return false; |
| |
| HitTestResult hitTestResult = src->eventHandler()->hitTestResultAtPoint(dragOrigin); |
| 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; |
| const KURL& linkURL = hitTestResult.absoluteLinkURL(); |
| const KURL& imageURL = hitTestResult.absoluteImageURL(); |
| |
| IntPoint mouseDraggedPoint = src->view()->windowToContents(dragEvent.position()); |
| |
| IntPoint dragLocation; |
| IntPoint dragOffset; |
| |
| Clipboard* clipboard = state.m_dragClipboard.get(); |
| // 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. |
| OwnPtr<DragImage> dragImage = clipboard->createDragImage(dragOffset); |
| if (dragImage) { |
| dragLocation = dragLocationForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragOffset, !linkURL.isEmpty()); |
| } |
| |
| Node* node = state.m_dragSrc.get(); |
| if (state.m_dragType == DragSourceActionSelection) { |
| if (!dragImage) { |
| dragImage = src->dragImageForSelection(); |
| if (dragImage) |
| dragImage->dissolveToFraction(DragImageAlpha); |
| dragLocation = dragLocationForSelectionDrag(src); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, clipboard, src, false); |
| } else if (state.m_dragType == DragSourceActionImage) { |
| if (imageURL.isEmpty() || !node || !node->isElementNode()) |
| return false; |
| Element* element = toElement(node); |
| Image* image = getImage(element); |
| if (!image || image->isNull()) |
| return false; |
| // 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()); |
| if (!dragImage) { |
| dragImage = dragImageForImage(element, image, dragOrigin, hitTestResult.imageRect(), dragLocation); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, clipboard, src, false); |
| } else if (state.m_dragType == DragSourceActionLink) { |
| if (linkURL.isEmpty()) |
| return false; |
| 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)); |
| } |
| |
| if (!dragImage) { |
| ASSERT(src->page()); |
| float deviceScaleFactor = src->page()->deviceScaleFactor(); |
| dragImage = dragImageForLink(linkURL, hitTestResult.textContent(), deviceScaleFactor, mouseDraggedPoint, dragLocation); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, mouseDraggedPoint, clipboard, src, true); |
| } else if (state.m_dragType == DragSourceActionDHTML) { |
| if (!dragImage) |
| return false; |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, clipboard, src, false); |
| } else { |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void DragController::doSystemDrag(DragImage* image, const IntPoint& dragLocation, 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(dragLocation)), |
| 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(); |
| } |
| |
| DragOperation DragController::dragOperation(DragData* dragData) |
| { |
| // FIXME: To match the MacOS behaviour we should return DragOperationNone |
| // if we are a modal window, we are the drag source, or the window is an |
| // attached sheet If this can be determined from within WebCore |
| // operationForDrag can be pulled into WebCore itself |
| ASSERT(dragData); |
| return dragData->containsURL(0) && !m_didInitiateDrag ? DragOperationCopy : DragOperationNone; |
| } |
| |
| bool DragController::isCopyKeyDown(DragData*) |
| { |
| // FIXME: This should not be OS specific. Delegate to the embedder instead. |
| #if OS(WINDOWS) |
| return ::GetAsyncKeyState(VK_CONTROL); |
| #else |
| return false; |
| #endif |
| } |
| |
| void DragController::cleanupAfterSystemDrag() |
| { |
| } |
| |
| } // namespace WebCore |
| |
