| /* |
| * 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 "core/page/DragController.h" |
| |
| #include "bindings/core/v8/ExceptionStatePlaceholder.h" |
| #include "core/HTMLNames.h" |
| #include "core/InputTypeNames.h" |
| #include "core/clipboard/DataObject.h" |
| #include "core/clipboard/DataTransfer.h" |
| #include "core/clipboard/DataTransferAccessPolicy.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/shadow/ShadowRoot.h" |
| #include "core/editing/DragCaretController.h" |
| #include "core/editing/EditingUtilities.h" |
| #include "core/editing/Editor.h" |
| #include "core/editing/FrameSelection.h" |
| #include "core/editing/serializers/Serialization.h" |
| #include "core/events/TextEvent.h" |
| #include "core/fetch/ImageResource.h" |
| #include "core/fetch/ResourceFetcher.h" |
| #include "core/frame/FrameHost.h" |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/frame/Settings.h" |
| #include "core/html/HTMLAnchorElement.h" |
| #include "core/html/HTMLFormElement.h" |
| #include "core/html/HTMLInputElement.h" |
| #include "core/html/HTMLPlugInElement.h" |
| #include "core/input/EventHandler.h" |
| #include "core/layout/HitTestRequest.h" |
| #include "core/layout/HitTestResult.h" |
| #include "core/layout/LayoutImage.h" |
| #include "core/layout/LayoutTheme.h" |
| #include "core/layout/api/LayoutViewItem.h" |
| #include "core/loader/FrameLoadRequest.h" |
| #include "core/loader/FrameLoader.h" |
| #include "core/page/ChromeClient.h" |
| #include "core/page/DragData.h" |
| #include "core/page/DragSession.h" |
| #include "core/page/DragState.h" |
| #include "core/page/Page.h" |
| #include "platform/DragImage.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/geometry/IntSize.h" |
| #include "platform/graphics/BitmapImage.h" |
| #include "platform/graphics/Image.h" |
| #include "platform/graphics/ImageOrientation.h" |
| #include "platform/network/ResourceRequest.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| #include "public/platform/WebCommon.h" |
| #include "public/platform/WebDragData.h" |
| #include "public/platform/WebDragOperation.h" |
| #include "public/platform/WebImage.h" |
| #include "public/platform/WebPoint.h" |
| #include "public/platform/WebScreenInfo.h" |
| #include "wtf/Assertions.h" |
| #include "wtf/CurrentTime.h" |
| #include "wtf/OwnPtr.h" |
| #include "wtf/PassOwnPtr.h" |
| #include "wtf/RefPtr.h" |
| |
| #if OS(WIN) |
| #include <windows.h> |
| #endif |
| |
| namespace blink { |
| |
| 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; |
| |
| #if ENABLE(ASSERT) |
| 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; |
| } |
| #endif |
| |
| static PlatformMouseEvent createMouseEvent(DragData* dragData) |
| { |
| return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(), |
| LeftButton, PlatformEvent::MouseMoved, 0, |
| static_cast<PlatformEvent::Modifiers>(dragData->modifiers()), |
| PlatformMouseEvent::RealOrIndistinguishable, monotonicallyIncreasingTime()); |
| } |
| |
| static DataTransfer* createDraggingDataTransfer(DataTransferAccessPolicy policy, DragData* dragData) |
| { |
| return DataTransfer::create(DataTransfer::DragAndDrop, policy, dragData->platformData()); |
| } |
| |
| DragController::DragController(Page* page) |
| : m_page(page) |
| , m_documentUnderMouse(nullptr) |
| , m_dragInitiator(nullptr) |
| , m_fileInputElementUnderMouse(nullptr) |
| , m_documentIsHandlingDrag(false) |
| , m_dragDestinationAction(DragDestinationActionNone) |
| , m_didInitiateDrag(false) |
| { |
| } |
| |
| DragController* DragController::create(Page* page) |
| { |
| return new DragController(page); |
| } |
| |
| static DocumentFragment* documentFragmentFromDragData(DragData* dragData, LocalFrame* frame, Range* context, bool allowPlainText, bool& chosePlainText) |
| { |
| ASSERT(dragData); |
| chosePlainText = false; |
| |
| Document& document = context->ownerDocument(); |
| if (dragData->containsCompatibleContent()) { |
| if (DocumentFragment* fragment = dragData->asFragment(frame)) |
| return fragment; |
| |
| if (dragData->containsURL(DragData::DoNotConvertFilenames)) { |
| String title; |
| String url = dragData->asURL(DragData::DoNotConvertFilenames, &title); |
| if (!url.isEmpty()) { |
| HTMLAnchorElement* anchor = HTMLAnchorElement::create(document); |
| anchor->setHref(AtomicString(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; |
| } |
| Node* anchorText = document.createTextNode(title); |
| anchor->appendChild(anchorText); |
| DocumentFragment* fragment = document.createDocumentFragment(); |
| fragment->appendChild(anchor); |
| return fragment; |
| } |
| } |
| } |
| if (allowPlainText && dragData->containsPlainText()) { |
| chosePlainText = true; |
| return createFragmentFromText(EphemeralRange(context), dragData->asPlainText()); |
| } |
| |
| return nullptr; |
| } |
| |
| 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 = nullptr; |
| m_didInitiateDrag = false; |
| m_page->dragCaretController().clear(); |
| } |
| |
| DragSession DragController::dragEntered(DragData* dragData) |
| { |
| return dragEnteredOrUpdated(dragData); |
| } |
| |
| void DragController::dragExited(DragData* dragData) |
| { |
| ASSERT(dragData); |
| LocalFrame* mainFrame = m_page->deprecatedLocalMainFrame(); |
| |
| FrameView* frameView(mainFrame->view()); |
| if (frameView) { |
| DataTransferAccessPolicy policy = (!m_documentUnderMouse || m_documentUnderMouse->getSecurityOrigin()->isLocal()) ? DataTransferReadable : DataTransferTypesReadable; |
| DataTransfer* dataTransfer = createDraggingDataTransfer(policy, dragData); |
| dataTransfer->setSourceOperation(dragData->draggingSourceOperationMask()); |
| mainFrame->eventHandler().cancelDragAndDrop(createMouseEvent(dragData), dataTransfer); |
| dataTransfer->setAccessPolicy(DataTransferNumb); // invalidate clipboard here for security |
| } |
| mouseMovedIntoDocument(nullptr); |
| if (m_fileInputElementUnderMouse) |
| m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false); |
| m_fileInputElementUnderMouse = nullptr; |
| } |
| |
| DragSession DragController::dragUpdated(DragData* dragData) |
| { |
| return dragEnteredOrUpdated(dragData); |
| } |
| |
| bool DragController::performDrag(DragData* dragData) |
| { |
| ASSERT(dragData); |
| m_documentUnderMouse = m_page->deprecatedLocalMainFrame()->documentAtPoint(dragData->clientPosition()); |
| if ((m_dragDestinationAction & DragDestinationActionDHTML) && m_documentIsHandlingDrag) { |
| LocalFrame* mainFrame = m_page->deprecatedLocalMainFrame(); |
| bool preventedDefault = false; |
| if (mainFrame->view()) { |
| // Sending an event can result in the destruction of the view and part. |
| DataTransfer* dataTransfer = createDraggingDataTransfer(DataTransferReadable, dragData); |
| dataTransfer->setSourceOperation(dragData->draggingSourceOperationMask()); |
| EventHandler& eventHandler = mainFrame->eventHandler(); |
| preventedDefault = eventHandler.performDragAndDrop(createMouseEvent(dragData), dataTransfer) != WebInputEventResult::NotHandled; |
| if (!preventedDefault) { |
| // When drop target is plugin element and it can process drag, we |
| // should prevent default behavior. |
| const IntPoint point = mainFrame->view()->rootFrameToContents(dragData->clientPosition()); |
| const HitTestResult result = eventHandler.hitTestResultAtPoint(point); |
| preventedDefault |= isHTMLPlugInElement(*result.innerNode()) && toHTMLPlugInElement(result.innerNode())->canProcessDrag(); |
| } |
| dataTransfer->setAccessPolicy(DataTransferNumb); // Invalidate clipboard here for security |
| } |
| if (preventedDefault) { |
| m_documentUnderMouse = nullptr; |
| cancelDrag(); |
| return true; |
| } |
| } |
| |
| if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) { |
| m_documentUnderMouse = nullptr; |
| return true; |
| } |
| |
| m_documentUnderMouse = nullptr; |
| |
| if (operationForLoad(dragData) == DragOperationNone) |
| return false; |
| |
| if (m_page->settings().navigateOnDragDrop()) |
| m_page->deprecatedLocalMainFrame()->loader().load(FrameLoadRequest(nullptr, ResourceRequest(dragData->asURL()))); |
| 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->deprecatedLocalMainFrame()->documentAtPoint(dragData->clientPosition())); |
| |
| // TODO(esprehn): Replace acceptsLoadDrops with a Setting used in core. |
| m_dragDestinationAction = m_page->chromeClient().acceptsLoadDrops() |
| ? DragDestinationActionAny |
| : static_cast<DragDestinationAction>(DragDestinationActionDHTML | DragDestinationActionEdit); |
| 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); |
| for (; node; node = node->shadowHost()) { |
| if (isHTMLInputElement(*node) && toHTMLInputElement(node)->type() == InputTypeNames::file) |
| return toHTMLInputElement(node); |
| } |
| return nullptr; |
| } |
| |
| // This can return null if an empty document is loaded. |
| static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& point) |
| { |
| HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active); |
| HitTestResult result(request, point); |
| documentUnderMouse->layoutViewItem().hitTest(result); |
| |
| Node* n = result.innerNode(); |
| while (n && !n->isElementNode()) |
| n = n->parentOrShadowHostNode(); |
| if (n && n->isInShadowTree()) |
| n = n->shadowHost(); |
| |
| return toElement(n); |
| } |
| |
| bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragSession& dragSession) |
| { |
| ASSERT(dragData); |
| |
| if (!m_documentUnderMouse) |
| return false; |
| |
| if (m_dragInitiator && !m_documentUnderMouse->getSecurityOrigin()->canAccess(m_dragInitiator->getSecurityOrigin())) |
| 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. |
| 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->rootFrameToContents(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()->positionForPoint(point)); |
| |
| LocalFrame* innerFrame = element->document().frame(); |
| dragSession.operation = dragIsMove(innerFrame->selection(), dragData) ? DragOperationMove : DragOperationCopy; |
| dragSession.mouseIsOverFileInput = m_fileInputElementUnderMouse; |
| dragSession.numberOfItemsToBeAccepted = 0; |
| |
| Vector<String> paths; |
| dragData->asFilePaths(paths); |
| const unsigned numberOfFiles = paths.size(); |
| if (m_fileInputElementUnderMouse) { |
| if (m_fileInputElementUnderMouse->isDisabledFormControl()) |
| dragSession.numberOfItemsToBeAccepted = 0; |
| else if (m_fileInputElementUnderMouse->multiple()) |
| dragSession.numberOfItemsToBeAccepted = numberOfFiles; |
| else if (numberOfFiles == 1) |
| dragSession.numberOfItemsToBeAccepted = 1; |
| else |
| dragSession.numberOfItemsToBeAccepted = 0; |
| |
| 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 = nullptr; |
| return false; |
| } |
| |
| DragOperation DragController::operationForLoad(DragData* dragData) |
| { |
| ASSERT(dragData); |
| Document* doc = m_page->deprecatedLocalMainFrame()->documentAtPoint(dragData->clientPosition()); |
| |
| if (doc && (m_didInitiateDrag || doc->isPluginDocument() || doc->hasEditableStyle())) |
| return DragOperationNone; |
| return dragOperation(dragData); |
| } |
| |
| static bool setSelectionToDragCaret(LocalFrame* frame, VisibleSelection& dragCaret, Range*& range, const IntPoint& point) |
| { |
| frame->selection().setSelection(dragCaret); |
| if (frame->selection().isNone()) { |
| dragCaret = VisibleSelection(frame->positionForPoint(point)); |
| frame->selection().setSelection(dragCaret); |
| range = createRange(dragCaret.toNormalizedEphemeralRange()); |
| } |
| return !frame->selection().isNone() && frame->selection().isContentEditable(); |
| } |
| |
| DispatchEventResult DragController::dispatchTextInputEventFor(LocalFrame* innerFrame, DragData* dragData) |
| { |
| ASSERT(m_page->dragCaretController().hasCaret()); |
| String text = m_page->dragCaretController().isContentRichlyEditable() ? "" : dragData->asPlainText(); |
| Element* target = innerFrame->editor().findEventTargetFrom(VisibleSelection(m_page->dragCaretController().caretPosition())); |
| return target->dispatchEvent(TextEvent::createForDrop(innerFrame->domWindow(), text)); |
| } |
| |
| bool DragController::concludeEditDrag(DragData* dragData) |
| { |
| ASSERT(dragData); |
| |
| HTMLInputElement* fileInput = m_fileInputElementUnderMouse; |
| if (m_fileInputElementUnderMouse) { |
| m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false); |
| m_fileInputElementUnderMouse = nullptr; |
| } |
| |
| if (!m_documentUnderMouse) |
| return false; |
| |
| IntPoint point = m_documentUnderMouse->view()->rootFrameToContents(dragData->clientPosition()); |
| Element* element = elementUnderMouse(m_documentUnderMouse.get(), point); |
| if (!element) |
| return false; |
| LocalFrame* innerFrame = element->ownerDocument()->frame(); |
| ASSERT(innerFrame); |
| |
| if (m_page->dragCaretController().hasCaret() && dispatchTextInputEventFor(innerFrame, dragData) != DispatchEventResult::NotCanceled) |
| 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->layoutObject()); |
| 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(); |
| Range* range = createRange(dragCaret.toNormalizedEphemeralRange()); |
| 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; |
| DocumentFragment* fragment = documentFragmentFromDragData(dragData, innerFrame, range, true, chosePlainText); |
| if (!fragment) |
| 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(); |
| innerFrame->editor().moveSelectionAfterDragging(fragment, dragCaret.base(), smartInsert, smartDelete); |
| } else { |
| if (setSelectionToDragCaret(innerFrame, dragCaret, range, point)) { |
| ASSERT(m_documentUnderMouse); |
| m_documentUnderMouse->frame()->editor().replaceSelectionAfterDragging(fragment, dragData->canSmartReplace(), chosePlainText); |
| } |
| } |
| } else { |
| String text = dragData->asPlainText(); |
| if (text.isEmpty()) |
| return false; |
| |
| if (setSelectionToDragCaret(innerFrame, dragCaret, range, point)) { |
| const bool canSmartReplace = false; |
| const bool chosePlainText = true; |
| ASSERT(m_documentUnderMouse); |
| m_documentUnderMouse->frame()->editor().replaceSelectionAfterDragging(createFragmentFromText(EphemeralRange(range), text), canSmartReplace, chosePlainText); |
| } |
| } |
| |
| if (rootEditableElement) { |
| if (LocalFrame* frame = rootEditableElement->document().frame()) |
| frame->eventHandler().updateDragStateAfterEditDragIfNeeded(rootEditableElement); |
| } |
| |
| return true; |
| } |
| |
| bool DragController::canProcessDrag(DragData* dragData) |
| { |
| ASSERT(dragData); |
| |
| if (!dragData->containsCompatibleContent()) |
| return false; |
| |
| IntPoint point = m_page->deprecatedLocalMainFrame()->view()->rootFrameToContents(dragData->clientPosition()); |
| if (m_page->deprecatedLocalMainFrame()->contentLayoutItem().isNull()) |
| return false; |
| |
| HitTestResult result = m_page->deprecatedLocalMainFrame()->eventHandler().hitTestResultAtPoint(point); |
| |
| if (!result.innerNode()) |
| return false; |
| |
| if (dragData->containsFiles() && asFileInput(result.innerNode())) |
| return true; |
| |
| if (isHTMLPlugInElement(*result.innerNode())) { |
| HTMLPlugInElement* plugin = toHTMLPlugInElement(result.innerNode()); |
| if (!plugin->canProcessDrag() && !result.innerNode()->hasEditableStyle()) |
| return false; |
| } else if (!result.innerNode()->hasEditableStyle()) { |
| 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); |
| LocalFrame* mainFrame = m_page->deprecatedLocalMainFrame(); |
| if (!mainFrame->view()) |
| return false; |
| |
| DataTransferAccessPolicy policy = m_documentUnderMouse->getSecurityOrigin()->isLocal() ? DataTransferReadable : DataTransferTypesReadable; |
| DataTransfer* dataTransfer = createDraggingDataTransfer(policy, dragData); |
| DragOperation srcOpMask = dragData->draggingSourceOperationMask(); |
| dataTransfer->setSourceOperation(srcOpMask); |
| |
| PlatformMouseEvent event = createMouseEvent(dragData); |
| if (mainFrame->eventHandler().updateDragAndDrop(event, dataTransfer) == WebInputEventResult::NotHandled) { |
| dataTransfer->setAccessPolicy(DataTransferNumb); // invalidate clipboard here for security |
| return false; |
| } |
| |
| operation = dataTransfer->destinationOperation(); |
| if (dataTransfer->dropEffectIsUninitialized()) { |
| operation = defaultOperationForDrag(srcOpMask); |
| } else if (!(srcOpMask & operation)) { |
| // The element picked an operation which is not supported by the source |
| operation = DragOperationNone; |
| } |
| |
| dataTransfer->setAccessPolicy(DataTransferNumb); // invalidate clipboard here for security |
| return true; |
| } |
| |
| Node* DragController::draggableNode(const LocalFrame* src, Node* startNode, const IntPoint& dragOrigin, SelectionDragPolicy selectionDragPolicy, DragSourceAction& dragType) const |
| { |
| if (src->selection().contains(dragOrigin)) { |
| dragType = DragSourceActionSelection; |
| if (selectionDragPolicy == ImmediateSelectionDragResolution) |
| return startNode; |
| } else { |
| dragType = DragSourceActionNone; |
| } |
| |
| Node* node = nullptr; |
| DragSourceAction candidateDragType = DragSourceActionNone; |
| for (const LayoutObject* layoutObject = startNode->layoutObject(); layoutObject; layoutObject = layoutObject->parent()) { |
| node = layoutObject->nonPseudoNode(); |
| if (!node) { |
| // Anonymous layout blocks don't correspond to actual DOM nodes, so we skip over them |
| // for the purposes of finding a draggable node. |
| continue; |
| } |
| if (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 nullptr; |
| } |
| if (node->isElementNode()) { |
| EUserDrag dragMode = layoutObject->style()->userDrag(); |
| if (dragMode == DRAG_NONE) |
| continue; |
| // Even if the image is part of a selection, we always only drag the image in this case. |
| if (layoutObject->isImage() |
| && src->settings() |
| && src->settings()->loadsImagesAutomatically()) { |
| dragType = DragSourceActionImage; |
| return node; |
| } |
| // Other draggable elements are considered unselectable. |
| if (isHTMLAnchorElement(*node) && toHTMLAnchorElement(node)->isLiveLink()) { |
| candidateDragType = DragSourceActionLink; |
| break; |
| } |
| if (dragMode == DRAG_ELEMENT) { |
| candidateDragType = DragSourceActionDHTML; |
| break; |
| } |
| } |
| } |
| |
| if (candidateDragType == DragSourceActionNone) { |
| // Either: |
| // 1) Nothing under the cursor is considered draggable, so we bail out. |
| // 2) There was a selection under the cursor but selectionDragPolicy is set to |
| // DelayedSelectionDragResolution and no other draggable element could be found, so bail |
| // out and allow text selection to start at the cursor instead. |
| return nullptr; |
| } |
| |
| ASSERT(node); |
| if (dragType == DragSourceActionSelection) { |
| // Dragging unselectable elements in a selection has special behavior if selectionDragPolicy |
| // is DelayedSelectionDragResolution and this drag was flagged as a potential selection |
| // drag. In that case, don't allow selection and just drag the entire selection instead. |
| ASSERT(selectionDragPolicy == DelayedSelectionDragResolution); |
| node = startNode; |
| } else { |
| // If the cursor isn't over a selection, then just drag the node we found earlier. |
| ASSERT(dragType == DragSourceActionNone); |
| dragType = candidateDragType; |
| } |
| return node; |
| } |
| |
| static ImageResource* getImageResource(Element* element) |
| { |
| ASSERT(element); |
| LayoutObject* layoutObject = element->layoutObject(); |
| if (!layoutObject || !layoutObject->isImage()) |
| return nullptr; |
| LayoutImage* image = toLayoutImage(layoutObject); |
| return image->cachedImage(); |
| } |
| |
| static Image* getImage(Element* element) |
| { |
| ASSERT(element); |
| ImageResource* cachedImage = getImageResource(element); |
| return (cachedImage && !cachedImage->errorOccurred()) ? |
| cachedImage->getImage() : nullptr; |
| } |
| |
| static void prepareDataTransferForImageDrag(LocalFrame* source, DataTransfer* dataTransfer, Element* node, const KURL& linkURL, const KURL& imageURL, const String& label) |
| { |
| if (node->isContentRichlyEditable()) { |
| Range* range = source->document()->createRange(); |
| range->selectNode(node, ASSERT_NO_EXCEPTION); |
| source->selection().setSelection(VisibleSelection(EphemeralRange(range))); |
| } |
| dataTransfer->declareAndWriteDragImage(node, !linkURL.isEmpty() ? linkURL : imageURL, label); |
| } |
| |
| bool DragController::populateDragDataTransfer(LocalFrame* src, const DragState& state, const IntPoint& dragOrigin) |
| { |
| ASSERT(dragTypeIsValid(state.m_dragType)); |
| ASSERT(src); |
| if (!src->view() || src->contentLayoutItem().isNull()) |
| return false; |
| |
| HitTestResult hitTestResult = src->eventHandler().hitTestResultAtPoint(dragOrigin); |
| // FIXME: Can this even happen? I guess it's possible, but should verify |
| // with a layout test. |
| if (!state.m_dragSrc->isShadowIncludingInclusiveAncestorOf(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(); |
| |
| DataTransfer* dataTransfer = state.m_dragDataTransfer.get(); |
| Node* node = state.m_dragSrc.get(); |
| |
| if (state.m_dragType == DragSourceActionSelection) { |
| dataTransfer->writeSelection(src->selection()); |
| } else if (state.m_dragType == DragSourceActionImage) { |
| if (imageURL.isEmpty() || !node || !node->isElementNode()) |
| return false; |
| Element* element = toElement(node); |
| prepareDataTransferForImageDrag(src, dataTransfer, 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. |
| dataTransfer->writeURL(node, linkURL, hitTestResult.textContent().simplifyWhiteSpace()); |
| } |
| // 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(LocalFrame* 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(float deviceScaleFactor) |
| { |
| #if OS(MACOSX) |
| // Match Safari's drag image size. |
| static const IntSize maxDragImageSize(400, 400); |
| #else |
| static const IntSize maxDragImageSize(200, 200); |
| #endif |
| IntSize maxSizeInPixels = maxDragImageSize; |
| maxSizeInPixels.scale(deviceScaleFactor); |
| return maxSizeInPixels; |
| } |
| |
| static PassOwnPtr<DragImage> dragImageForImage(Element* element, Image* image, float deviceScaleFactor, const IntPoint& dragOrigin, const IntPoint& imageElementLocation, const IntSize& imageElementSizeInPixels, IntPoint& dragLocation) |
| { |
| OwnPtr<DragImage> dragImage; |
| IntPoint origin; |
| |
| InterpolationQuality interpolationQuality = element->ensureComputedStyle()->imageRendering() == ImageRenderingPixelated ? InterpolationNone : InterpolationHigh; |
| RespectImageOrientationEnum shouldRespectImageOrientation = LayoutObject::shouldRespectImageOrientation(element->layoutObject()); |
| ImageOrientation orientation; |
| |
| if (shouldRespectImageOrientation == RespectImageOrientation && image->isBitmapImage()) |
| orientation = toBitmapImage(image)->currentFrameOrientation(); |
| |
| IntSize imageSize = orientation.usesWidthAsHeight() ? image->size().transposedSize() : image->size(); |
| |
| FloatSize imageScale = DragImage::clampedImageScale(imageSize, imageElementSizeInPixels, maxDragImageSize(deviceScaleFactor)); |
| |
| if (imageSize.area() <= MaxOriginalImageArea |
| && (dragImage = DragImage::create(image, shouldRespectImageOrientation, |
| deviceScaleFactor, interpolationQuality, DragImageAlpha, imageScale))) { |
| IntSize originalSize = imageElementSizeInPixels; |
| origin = imageElementLocation; |
| |
| 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; |
| } |
| |
| static PassOwnPtr<DragImage> dragImageForLink(const KURL& linkURL, const String& linkText, float deviceScaleFactor, const IntPoint& mouseDraggedPoint, IntPoint& dragLoc) |
| { |
| FontDescription fontDescription; |
| LayoutTheme::theme().systemFont(blink::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; |
| } |
| |
| bool DragController::startDrag(LocalFrame* src, const DragState& state, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin) |
| { |
| ASSERT(dragTypeIsValid(state.m_dragType)); |
| ASSERT(src); |
| if (!src->view() || src->contentLayoutItem().isNull()) |
| return false; |
| |
| HitTestResult hitTestResult = src->eventHandler().hitTestResultAtPoint(dragOrigin); |
| if (!state.m_dragSrc->isShadowIncludingInclusiveAncestorOf(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()->rootFrameToContents(dragEvent.position()); |
| |
| IntPoint dragLocation; |
| IntPoint dragOffset; |
| |
| DataTransfer* dataTransfer = state.m_dragDataTransfer.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 = dataTransfer->createDragImage(dragOffset, src); |
| 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(DragImageAlpha); |
| dragLocation = dragLocationForSelectionDrag(src); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, dataTransfer, 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) { |
| const IntRect& imageRect = hitTestResult.imageRect(); |
| IntSize imageSizeInPixels = imageRect.size(); |
| // TODO(oshima): Remove this scaling and simply pass imageRect to dragImageForImage |
| // once all platforms are migrated to use zoom for dsf. |
| imageSizeInPixels.scale(src->host()->deviceScaleFactorDeprecated()); |
| |
| float screenDeviceScaleFactor = src->page()->chromeClient().screenInfo().deviceScaleFactor; |
| // Pass the selected image size in DIP becasue dragImageForImage clips the image in DIP. |
| // The coordinates of the locations are in Viewport coordinates, and they're converted in the Blink client. |
| // TODO(oshima): Currently, the dragged image on high DPI is scaled and can be blurry because of this. |
| // Consider to clip in the screen coordinates to use high resolution image on high DPI screens. |
| dragImage = dragImageForImage(element, image, screenDeviceScaleFactor, dragOrigin, imageRect.location(), imageSizeInPixels, dragLocation); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, dataTransfer, 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 |
| if (Node* node = enclosingAnchorElement(src->selection().base())) |
| src->selection().setSelection(VisibleSelection::selectionFromContentsOfNode(node)); |
| } |
| |
| if (!dragImage) { |
| ASSERT(src->page()); |
| float screenDeviceScaleFactor = src->page()->chromeClient().screenInfo().deviceScaleFactor; |
| dragImage = dragImageForLink(linkURL, hitTestResult.textContent(), screenDeviceScaleFactor, mouseDraggedPoint, dragLocation); |
| } |
| doSystemDrag(dragImage.get(), dragLocation, mouseDraggedPoint, dataTransfer, src, true); |
| } else if (state.m_dragType == DragSourceActionDHTML) { |
| doSystemDrag(dragImage.get(), dragLocation, dragOrigin, dataTransfer, src, false); |
| } else { |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // TODO(esprehn): forLink is dead code, what was it for? |
| void DragController::doSystemDrag(DragImage* image, const IntPoint& dragLocation, const IntPoint& eventPos, DataTransfer* dataTransfer, LocalFrame* frame, bool forLink) |
| { |
| // TODO(dcheng): Drag and drop is not yet supported for OOPI. |
| if (m_page->mainFrame()->isRemoteFrame()) |
| return; |
| m_didInitiateDrag = true; |
| m_dragInitiator = frame->document(); |
| |
| LocalFrame* mainFrame = m_page->deprecatedLocalMainFrame(); |
| FrameView* mainFrameView = mainFrame->view(); |
| IntPoint adjustedDragLocation = mainFrameView->rootFrameToContents(frame->view()->contentsToRootFrame(dragLocation)); |
| IntPoint adjustedEventPos = mainFrameView->rootFrameToContents(frame->view()->contentsToRootFrame(eventPos)); |
| WebDragData dragData = dataTransfer->dataObject()->toWebDragData(); |
| WebDragOperationsMask dragOperationMask = static_cast<WebDragOperationsMask>(dataTransfer->sourceOperation()); |
| IntSize offsetSize(adjustedEventPos - adjustedDragLocation); |
| WebPoint offsetPoint(offsetSize.width(), offsetSize.height()); |
| WebImage dragImage; |
| |
| if (image) { |
| float resolutionScale = image->resolutionScale(); |
| float deviceScaleFactor = m_page->chromeClient().screenInfo().deviceScaleFactor; |
| if (deviceScaleFactor != resolutionScale) { |
| DCHECK_GT(resolutionScale, 0); |
| float scale = deviceScaleFactor / resolutionScale; |
| image->scale(scale, scale); |
| } |
| dragImage = image->bitmap(); |
| } |
| |
| m_page->chromeClient().startDragging(frame, dragData, dragOperationMask, dragImage, offsetPoint); |
| } |
| |
| 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() && !m_didInitiateDrag ? DragOperationCopy : DragOperationNone; |
| } |
| |
| bool DragController::isCopyKeyDown(DragData* dragData) |
| { |
| int modifiers = dragData->modifiers(); |
| |
| #if OS(MACOSX) |
| return modifiers & PlatformEvent::AltKey; |
| #else |
| return modifiers & PlatformEvent::CtrlKey; |
| #endif |
| } |
| |
| DEFINE_TRACE(DragController) |
| { |
| visitor->trace(m_page); |
| visitor->trace(m_documentUnderMouse); |
| visitor->trace(m_dragInitiator); |
| visitor->trace(m_fileInputElementUnderMouse); |
| } |
| |
| } // namespace blink |
