| /* |
| * Copyright (C) 2007, 2009, 2010, 2013 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "DragController.h" |
| |
| #if ENABLE(DRAG_SUPPORT) |
| |
| #include "CachedImage.h" |
| #include "Clipboard.h" |
| #include "ClipboardAccessPolicy.h" |
| #include "CachedResourceLoader.h" |
| #include "Document.h" |
| #include "DocumentFragment.h" |
| #include "DragActions.h" |
| #include "DragClient.h" |
| #include "DragData.h" |
| #include "DragSession.h" |
| #include "DragState.h" |
| #include "Editor.h" |
| #include "EditorClient.h" |
| #include "Element.h" |
| #include "EventHandler.h" |
| #include "ExceptionCodePlaceholder.h" |
| #include "FloatRect.h" |
| #include "FrameLoadRequest.h" |
| #include "FrameLoader.h" |
| #include "FrameSelection.h" |
| #include "FrameView.h" |
| #include "HTMLAnchorElement.h" |
| #include "HTMLImageElement.h" |
| #include "HTMLInputElement.h" |
| #include "HTMLNames.h" |
| #include "HTMLPlugInElement.h" |
| #include "HitTestRequest.h" |
| #include "HitTestResult.h" |
| #include "Image.h" |
| #include "ImageOrientation.h" |
| #include "MainFrame.h" |
| #include "MoveSelectionCommand.h" |
| #include "Page.h" |
| #include "Pasteboard.h" |
| #include "PlatformKeyboardEvent.h" |
| #include "PluginDocument.h" |
| #include "PluginViewBase.h" |
| #include "RenderFileUploadControl.h" |
| #include "RenderImage.h" |
| #include "RenderView.h" |
| #include "ReplaceSelectionCommand.h" |
| #include "ResourceRequest.h" |
| #include "SecurityOrigin.h" |
| #include "Settings.h" |
| #include "ShadowRoot.h" |
| #include "StylePropertySet.h" |
| #include "Text.h" |
| #include "TextEvent.h" |
| #include "htmlediting.h" |
| #include "markup.h" |
| #include <wtf/CurrentTime.h> |
| #include <wtf/RefPtr.h> |
| |
| namespace WebCore { |
| |
| static PlatformMouseEvent createMouseEvent(DragData& dragData) |
| { |
| bool shiftKey, ctrlKey, altKey, metaKey; |
| shiftKey = ctrlKey = altKey = metaKey = false; |
| int keyState = dragData.modifierKeyState(); |
| shiftKey = static_cast<bool>(keyState & PlatformEvent::ShiftKey); |
| ctrlKey = static_cast<bool>(keyState & PlatformEvent::CtrlKey); |
| altKey = static_cast<bool>(keyState & PlatformEvent::AltKey); |
| metaKey = static_cast<bool>(keyState & PlatformEvent::MetaKey); |
| |
| return PlatformMouseEvent(dragData.clientPosition(), dragData.globalPosition(), |
| LeftButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey, |
| metaKey, currentTime()); |
| } |
| |
| DragController::DragController(Page& page, DragClient& client) |
| : m_page(page) |
| , m_client(client) |
| , m_documentUnderMouse(0) |
| , m_dragInitiator(0) |
| , m_fileInputElementUnderMouse(0) |
| , m_documentIsHandlingDrag(false) |
| , m_dragDestinationAction(DragDestinationActionNone) |
| , m_dragSourceAction(DragSourceActionNone) |
| , m_didInitiateDrag(false) |
| , m_sourceDragOperation(DragOperationNone) |
| { |
| } |
| |
| DragController::~DragController() |
| { |
| m_client.dragControllerDestroyed(); |
| } |
| |
| static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData& dragData, Frame* frame, Range& context, bool allowPlainText, bool& chosePlainText) |
| { |
| chosePlainText = false; |
| |
| Document& document = context.ownerDocument(); |
| if (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, dragData.asPlainText(frame)).get(); |
| } |
| |
| return 0; |
| } |
| |
| bool DragController::dragIsMove(FrameSelection& selection, DragData& dragData) |
| { |
| return m_documentUnderMouse == m_dragInitiator && selection.isContentEditable() && selection.isRange() && !isCopyKeyDown(dragData); |
| } |
| |
| // FIXME: This method is poorly named. We're just clearing the selection from the document this drag is exiting. |
| void DragController::cancelDrag() |
| { |
| m_page.dragCaretController().clear(); |
| } |
| |
| void DragController::dragEnded() |
| { |
| m_dragInitiator = 0; |
| m_didInitiateDrag = false; |
| m_page.dragCaretController().clear(); |
| |
| m_client.dragEnded(); |
| } |
| |
| DragSession DragController::dragEntered(DragData& dragData) |
| { |
| return dragEnteredOrUpdated(dragData); |
| } |
| |
| void DragController::dragExited(DragData& dragData) |
| { |
| if (RefPtr<FrameView> v = m_page.mainFrame().view()) { |
| ClipboardAccessPolicy policy = (!m_documentUnderMouse || m_documentUnderMouse->securityOrigin()->isLocal()) ? ClipboardReadable : ClipboardTypesReadable; |
| RefPtr<Clipboard> clipboard = Clipboard::createForDragAndDrop(policy, dragData); |
| clipboard->setSourceOperation(dragData.draggingSourceOperationMask()); |
| m_page.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) |
| { |
| m_documentUnderMouse = m_page.mainFrame().documentAtPoint(dragData.clientPosition()); |
| if ((m_dragDestinationAction & DragDestinationActionDHTML) && m_documentIsHandlingDrag) { |
| m_client.willPerformDragDestinationAction(DragDestinationActionDHTML, dragData); |
| Ref<MainFrame> 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::createForDragAndDrop(ClipboardReadable, dragData); |
| clipboard->setSourceOperation(dragData.draggingSourceOperationMask()); |
| preventedDefault = mainFrame->eventHandler().performDragAndDrop(createMouseEvent(dragData), clipboard.get()); |
| clipboard->setAccessPolicy(ClipboardNumb); // Invalidate clipboard here for security |
| } |
| if (preventedDefault) { |
| m_documentUnderMouse = 0; |
| return true; |
| } |
| } |
| |
| if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) { |
| m_documentUnderMouse = 0; |
| return true; |
| } |
| |
| m_documentUnderMouse = 0; |
| |
| if (operationForLoad(dragData) == DragOperationNone) |
| return false; |
| |
| m_client.willPerformDragDestinationAction(DragDestinationActionLoad, dragData); |
| m_page.mainFrame().loader().load(FrameLoadRequest(&m_page.mainFrame(), ResourceRequest(dragData.asURL(&m_page.mainFrame())))); |
| return true; |
| } |
| |
| void DragController::mouseMovedIntoDocument(Document* newDocument) |
| { |
| if (m_documentUnderMouse == newDocument) |
| return; |
| |
| // If we were over another document clear the selection |
| if (m_documentUnderMouse) |
| cancelDrag(); |
| m_documentUnderMouse = newDocument; |
| } |
| |
| DragSession DragController::dragEnteredOrUpdated(DragData& dragData) |
| { |
| mouseMovedIntoDocument(m_page.mainFrame().documentAtPoint(dragData.clientPosition())); |
| |
| m_dragDestinationAction = m_client.actionMaskForDrag(dragData); |
| if (m_dragDestinationAction == DragDestinationActionNone) { |
| cancelDrag(); // FIXME: Why not call mouseMovedIntoDocument(0)? |
| return DragSession(); |
| } |
| |
| DragSession dragSession; |
| m_documentIsHandlingDrag = tryDocumentDrag(dragData, m_dragDestinationAction, dragSession); |
| if (!m_documentIsHandlingDrag && (m_dragDestinationAction & DragDestinationActionLoad)) |
| dragSession.operation = operationForLoad(dragData); |
| return dragSession; |
| } |
| |
| static HTMLInputElement* asFileInput(Node* node) |
| { |
| ASSERT(node); |
| |
| HTMLInputElement* inputElement = node->toInputElement(); |
| |
| // If this is a button inside of the a file input, move up to the file input. |
| if (inputElement && inputElement->isTextButton() && inputElement->treeScope().rootNode()->isShadowRoot()) |
| inputElement = toShadowRoot(inputElement->treeScope().rootNode())->hostElement()->toInputElement(); |
| |
| return inputElement && inputElement->isFileUpload() ? inputElement : 0; |
| } |
| |
| // This can return null if an empty document is loaded. |
| static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p) |
| { |
| Frame* frame = documentUnderMouse->frame(); |
| float zoomFactor = frame ? frame->pageZoomFactor() : 1; |
| LayoutPoint point = roundedLayoutPoint(FloatPoint(p.x() * zoomFactor, p.y() * zoomFactor)); |
| |
| HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::DisallowShadowContent); |
| HitTestResult result(point); |
| documentUnderMouse->renderView()->hitTest(request, result); |
| |
| Node* n = result.innerNode(); |
| while (n && !n->isElementNode()) |
| n = n->parentNode(); |
| if (n) |
| n = n->deprecatedShadowAncestorNode(); |
| |
| return toElement(n); |
| } |
| |
| bool DragController::tryDocumentDrag(DragData& dragData, DragDestinationAction actionMask, DragSession& dragSession) |
| { |
| if (!m_documentUnderMouse) |
| return false; |
| |
| if (m_dragInitiator && !m_documentUnderMouse->securityOrigin()->canReceiveDragData(m_dragInitiator->securityOrigin())) |
| return false; |
| |
| bool isHandlingDrag = false; |
| if (actionMask & DragDestinationActionDHTML) { |
| isHandlingDrag = tryDHTMLDrag(dragData, dragSession.operation); |
| // Do not continue if m_documentUnderMouse has been reset by tryDHTMLDrag. |
| // tryDHTMLDrag fires dragenter event. The event listener that listens |
| // to this event may create a nested message loop (open a modal dialog), |
| // which could process dragleave event and reset m_documentUnderMouse in |
| // dragExited. |
| if (!m_documentUnderMouse) |
| return false; |
| } |
| |
| // It's unclear why this check is after tryDHTMLDrag. |
| // We send drag events in tryDHTMLDrag and that may be the reason. |
| RefPtr<FrameView> frameView = m_documentUnderMouse->view(); |
| if (!frameView) |
| return false; |
| |
| if (isHandlingDrag) { |
| m_page.dragCaretController().clear(); |
| return true; |
| } |
| |
| if ((actionMask & DragDestinationActionEdit) && canProcessDrag(dragData)) { |
| if (dragData.containsColor()) { |
| dragSession.operation = DragOperationGeneric; |
| return true; |
| } |
| |
| IntPoint point = frameView->windowToContents(dragData.clientPosition()); |
| Element* element = elementUnderMouse(m_documentUnderMouse.get(), point); |
| if (!element) |
| return false; |
| |
| HTMLInputElement* elementAsFileInput = asFileInput(element); |
| if (m_fileInputElementUnderMouse != elementAsFileInput) { |
| if (m_fileInputElementUnderMouse) |
| m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false); |
| m_fileInputElementUnderMouse = elementAsFileInput; |
| } |
| |
| if (!m_fileInputElementUnderMouse) |
| m_page.dragCaretController().setCaretPosition(m_documentUnderMouse->frame()->visiblePositionForPoint(point)); |
| |
| Frame* innerFrame = element->document().frame(); |
| dragSession.operation = dragIsMove(innerFrame->selection(), dragData) ? DragOperationMove : DragOperationCopy; |
| dragSession.mouseIsOverFileInput = m_fileInputElementUnderMouse; |
| dragSession.numberOfItemsToBeAccepted = 0; |
| |
| unsigned numberOfFiles = dragData.numberOfFiles(); |
| if (m_fileInputElementUnderMouse) { |
| if (m_fileInputElementUnderMouse->isDisabledFormControl()) |
| dragSession.numberOfItemsToBeAccepted = 0; |
| else if (m_fileInputElementUnderMouse->multiple()) |
| dragSession.numberOfItemsToBeAccepted = numberOfFiles; |
| else if (numberOfFiles > 1) |
| dragSession.numberOfItemsToBeAccepted = 0; |
| else |
| dragSession.numberOfItemsToBeAccepted = 1; |
| |
| if (!dragSession.numberOfItemsToBeAccepted) |
| dragSession.operation = DragOperationNone; |
| m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(dragSession.numberOfItemsToBeAccepted); |
| } else { |
| // We are not over a file input element. The dragged item(s) will only |
| // be loaded into the view the number of dragged items is 1. |
| dragSession.numberOfItemsToBeAccepted = numberOfFiles != 1 ? 0 : 1; |
| } |
| |
| return true; |
| } |
| |
| // We are not over an editable region. Make sure we're clearing any prior drag cursor. |
| m_page.dragCaretController().clear(); |
| if (m_fileInputElementUnderMouse) |
| m_fileInputElementUnderMouse->setCanReceiveDroppedFiles(false); |
| m_fileInputElementUnderMouse = 0; |
| return false; |
| } |
| |
| DragSourceAction DragController::delegateDragSourceAction(const IntPoint& rootViewPoint) |
| { |
| m_dragSourceAction = m_client.dragSourceActionMaskForPoint(rootViewPoint); |
| return m_dragSourceAction; |
| } |
| |
| DragOperation DragController::operationForLoad(DragData& dragData) |
| { |
| Document* doc = m_page.mainFrame().documentAtPoint(dragData.clientPosition()); |
| |
| bool pluginDocumentAcceptsDrags = false; |
| |
| if (doc && doc->isPluginDocument()) { |
| const Widget* widget = toPluginDocument(doc)->pluginWidget(); |
| const PluginViewBase* pluginView = (widget && widget->isPluginViewBase()) ? toPluginViewBase(widget) : nullptr; |
| |
| if (pluginView) |
| pluginDocumentAcceptsDrags = pluginView->shouldAllowNavigationFromDrags(); |
| } |
| |
| if (doc && (m_didInitiateDrag || (doc->isPluginDocument() && !pluginDocumentAcceptsDrags) || doc->rendererIsEditable())) |
| return DragOperationNone; |
| return dragOperation(dragData); |
| } |
| |
| static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, RefPtr<Range>& range, const IntPoint& point) |
| { |
| frame->selection().setSelection(dragCaret); |
| if (frame->selection().isNone()) { |
| dragCaret = frame->visiblePositionForPoint(point); |
| frame->selection().setSelection(dragCaret); |
| range = dragCaret.toNormalizedRange(); |
| } |
| return !frame->selection().isNone() && frame->selection().isContentEditable(); |
| } |
| |
| bool DragController::dispatchTextInputEventFor(Frame* innerFrame, DragData& dragData) |
| { |
| ASSERT(m_page.dragCaretController().hasCaret()); |
| String text = m_page.dragCaretController().isContentRichlyEditable() ? emptyString() : dragData.asPlainText(innerFrame); |
| Node* target = innerFrame->editor().findEventTargetFrom(m_page.dragCaretController().caretPosition()); |
| return target->dispatchEvent(TextEvent::createForDrop(innerFrame->document()->domWindow(), text), IGNORE_EXCEPTION); |
| } |
| |
| bool DragController::concludeEditDrag(DragData& dragData) |
| { |
| 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->document().frame(); |
| ASSERT(innerFrame); |
| |
| if (m_page.dragCaretController().hasCaret() && !dispatchTextInputEventFor(innerFrame.get(), dragData)) |
| return true; |
| |
| if (dragData.containsColor()) { |
| Color color = dragData.asColor(); |
| if (!color.isValid()) |
| return false; |
| RefPtr<Range> innerRange = innerFrame->selection().toNormalizedRange(); |
| RefPtr<MutableStylePropertySet> style = MutableStylePropertySet::create(); |
| style->setProperty(CSSPropertyColor, color.serialized(), false); |
| if (!innerFrame->editor().shouldApplyStyle(style.get(), innerRange.get())) |
| return false; |
| m_client.willPerformDragDestinationAction(DragDestinationActionEdit, dragData); |
| innerFrame->editor().applyStyle(style.get(), EditActionSetColor); |
| return true; |
| } |
| |
| if (dragData.containsFiles() && fileInput) { |
| // fileInput should be the element we hit tested for, unless it was made |
| // display:none in a drop event handler. |
| ASSERT(fileInput == element || !fileInput->renderer()); |
| if (fileInput->isDisabledFormControl()) |
| return false; |
| |
| return fileInput->receiveDroppedFiles(dragData); |
| } |
| |
| if (!m_page.dragController().canProcessDrag(dragData)) { |
| m_page.dragCaretController().clear(); |
| return false; |
| } |
| |
| VisibleSelection dragCaret = m_page.dragCaretController().caretPosition(); |
| m_page.dragCaretController().clear(); |
| RefPtr<Range> range = dragCaret.toNormalizedRange(); |
| RefPtr<Element> rootEditableElement = innerFrame->selection().rootEditableElement(); |
| |
| // For range to be null a WebKit client must have done something bad while |
| // manually controlling drag behaviour |
| if (!range) |
| return false; |
| |
| CachedResourceLoader* cachedResourceLoader = range->ownerDocument().cachedResourceLoader(); |
| ResourceCacheValidationSuppressor validationSuppressor(cachedResourceLoader); |
| if (dragIsMove(innerFrame->selection(), dragData) || dragCaret.isContentRichlyEditable()) { |
| bool chosePlainText = false; |
| RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, innerFrame.get(), *range, true, chosePlainText); |
| if (!fragment || !innerFrame->editor().shouldInsertFragment(fragment, range, EditorInsertActionDropped)) { |
| return false; |
| } |
| |
| m_client.willPerformDragDestinationAction(DragDestinationActionEdit, dragData); |
| if (dragIsMove(innerFrame->selection(), dragData)) { |
| // NSTextView behavior is to always smart delete on moving a selection, |
| // but only to smart insert if the selection granularity is word granularity. |
| bool smartDelete = innerFrame->editor().smartInsertDeleteEnabled(); |
| bool smartInsert = smartDelete && innerFrame->selection().granularity() == WordGranularity && dragData.canSmartReplace(); |
| applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete)); |
| } else { |
| if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) { |
| ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting; |
| if (dragData.canSmartReplace()) |
| options |= ReplaceSelectionCommand::SmartReplace; |
| if (chosePlainText) |
| options |= ReplaceSelectionCommand::MatchStyle; |
| applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse, fragment, options)); |
| } |
| } |
| } else { |
| String text = dragData.asPlainText(innerFrame.get()); |
| if (text.isEmpty() || !innerFrame->editor().shouldInsertText(text, range.get(), EditorInsertActionDropped)) { |
| return false; |
| } |
| |
| m_client.willPerformDragDestinationAction(DragDestinationActionEdit, dragData); |
| if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) |
| applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse, createFragmentFromText(*range, 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) |
| { |
| if (!dragData.containsCompatibleContent()) |
| return false; |
| |
| IntPoint point = m_page.mainFrame().view()->windowToContents(dragData.clientPosition()); |
| HitTestResult result = HitTestResult(point); |
| if (!m_page.mainFrame().contentRenderer()) |
| return false; |
| |
| result = m_page.mainFrame().eventHandler().hitTestResultAtPoint(point, HitTestRequest::ReadOnly | HitTestRequest::Active); |
| |
| if (!result.innerNonSharedNode()) |
| return false; |
| |
| if (dragData.containsFiles() && asFileInput(result.innerNonSharedNode())) |
| return true; |
| |
| if (result.innerNonSharedNode()->isPluginElement()) { |
| if (!toHTMLPlugInElement(result.innerNonSharedNode())->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(m_documentUnderMouse); |
| Ref<MainFrame> 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::createForDragAndDrop(policy, dragData); |
| 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; |
| } |
| |
| Element* DragController::draggableElement(const Frame* sourceFrame, Element* startElement, const IntPoint& dragOrigin, DragState& state) const |
| { |
| state.type = (sourceFrame->selection().contains(dragOrigin)) ? DragSourceActionSelection : DragSourceActionNone; |
| if (!startElement) |
| return 0; |
| |
| for (auto renderer = startElement->renderer(); renderer; renderer = renderer->parent()) { |
| Element* element = renderer->nonPseudoElement(); |
| if (!element) { |
| // Anonymous render blocks don't correspond to actual DOM elements, so we skip over them |
| // for the purposes of finding a draggable element. |
| continue; |
| } |
| EUserDrag dragMode = renderer->style().userDrag(); |
| if ((m_dragSourceAction & DragSourceActionDHTML) && dragMode == DRAG_ELEMENT) { |
| state.type = static_cast<DragSourceAction>(state.type | DragSourceActionDHTML); |
| return element; |
| } |
| if (dragMode == DRAG_AUTO) { |
| if ((m_dragSourceAction & DragSourceActionImage) |
| && isHTMLImageElement(element) |
| && sourceFrame->settings().loadsImagesAutomatically()) { |
| state.type = static_cast<DragSourceAction>(state.type | DragSourceActionImage); |
| return element; |
| } |
| if ((m_dragSourceAction & DragSourceActionLink) |
| && isHTMLAnchorElement(element) |
| && toHTMLAnchorElement(element)->isLiveLink()) { |
| state.type = static_cast<DragSourceAction>(state.type | DragSourceActionLink); |
| return element; |
| } |
| } |
| } |
| |
| // We either have nothing to drag or we have a selection and we're not over a draggable element. |
| return (state.type & DragSourceActionSelection) ? startElement : 0; |
| } |
| |
| static CachedImage* getCachedImage(Element& element) |
| { |
| RenderObject* renderer = element.renderer(); |
| if (!renderer || !renderer->isImage()) |
| return 0; |
| RenderImage* image = toRenderImage(renderer); |
| return image->cachedImage(); |
| } |
| |
| static Image* getImage(Element& element) |
| { |
| CachedImage* cachedImage = getCachedImage(element); |
| // Don't use cachedImage->imageForRenderer() here as that may return BitmapImages for cached SVG Images. |
| // Users of getImage() want access to the SVGImage, in order to figure out the filename extensions, |
| // which would be empty when asking the cached BitmapImages. |
| return (cachedImage && !cachedImage->errorOccurred()) ? |
| cachedImage->image() : 0; |
| } |
| |
| static void selectElement(Element& element) |
| { |
| RefPtr<Range> range = element.document().createRange(); |
| range->selectNode(&element); |
| element.document().frame()->selection().setSelection(VisibleSelection(range.get(), DOWNSTREAM)); |
| } |
| |
| static IntPoint dragLocForDHTMLDrag(const IntPoint& mouseDraggedPoint, const IntPoint& dragOrigin, const IntPoint& dragImageOffset, bool isLinkImage) |
| { |
| // dragImageOffset is the cursor position relative to the lower-left corner of the image. |
| #if PLATFORM(MAC) |
| // We add in the Y dimension because we are a flipped view, so adding moves the image down. |
| const int yOffset = dragImageOffset.y(); |
| #else |
| const int yOffset = -dragImageOffset.y(); |
| #endif |
| |
| if (isLinkImage) |
| return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset); |
| |
| return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset); |
| } |
| |
| static IntPoint dragLocForSelectionDrag(Frame& src) |
| { |
| IntRect draggingRect = enclosingIntRect(src.selection().bounds()); |
| int xpos = draggingRect.maxX(); |
| xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos; |
| int ypos = draggingRect.maxY(); |
| #if PLATFORM(MAC) |
| // Deal with flipped coordinates on Mac |
| ypos = draggingRect.y() > ypos ? draggingRect.y() : ypos; |
| #else |
| ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos; |
| #endif |
| return IntPoint(xpos, ypos); |
| } |
| |
| bool DragController::startDrag(Frame& src, const DragState& state, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin) |
| { |
| if (!src.view() || !src.contentRenderer()) |
| return false; |
| |
| HitTestResult hitTestResult = src.eventHandler().hitTestResultAtPoint(dragOrigin, HitTestRequest::ReadOnly | HitTestRequest::Active); |
| if (!state.source->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; |
| URL linkURL = hitTestResult.absoluteLinkURL(); |
| URL imageURL = hitTestResult.absoluteImageURL(); |
| |
| IntPoint mouseDraggedPoint = src.view()->windowToContents(dragEvent.position()); |
| |
| m_draggingImageURL = URL(); |
| m_sourceDragOperation = srcOp; |
| |
| DragImageRef dragImage = 0; |
| IntPoint dragLoc(0, 0); |
| IntPoint dragImageOffset(0, 0); |
| |
| ASSERT(state.clipboard); |
| |
| Clipboard& clipboard = *state.clipboard; |
| if (state.type == DragSourceActionDHTML) |
| dragImage = clipboard.createDragImage(dragImageOffset); |
| if (state.type == DragSourceActionSelection || !imageURL.isEmpty() || !linkURL.isEmpty()) |
| // Selection, image, and link drags receive a default set of allowed drag operations that |
| // follows from: |
| // http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebHTMLView.mm?rev=48526#L3430 |
| m_sourceDragOperation = static_cast<DragOperation>(m_sourceDragOperation | DragOperationGeneric | DragOperationCopy); |
| |
| // We allow DHTML/JS to set the drag image, even if its a link, image or text we're dragging. |
| // This is in the spirit of the IE API, which allows overriding of pasteboard data and DragOp. |
| if (dragImage) { |
| dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, !linkURL.isEmpty()); |
| m_dragOffset = dragImageOffset; |
| } |
| |
| bool startedDrag = true; // optimism - we almost always manage to start the drag |
| |
| ASSERT(state.source); |
| Element& element = *state.source; |
| |
| Image* image = getImage(element); |
| if (state.type == DragSourceActionSelection) { |
| if (!clipboard.pasteboard().hasData()) { |
| // FIXME: This entire block is almost identical to the code in Editor::copy, and the code should be shared. |
| |
| RefPtr<Range> selectionRange = src.selection().toNormalizedRange(); |
| ASSERT(selectionRange); |
| |
| src.editor().willWriteSelectionToPasteboard(selectionRange.get()); |
| |
| if (enclosingTextFormControl(src.selection().start())) |
| clipboard.pasteboard().writePlainText(src.editor().selectedTextForClipboard(), Pasteboard::CannotSmartReplace); |
| else { |
| #if PLATFORM(MAC) || PLATFORM(EFL) |
| src.editor().writeSelectionToPasteboard(clipboard.pasteboard()); |
| #else |
| // FIXME: Convert all other platforms to match Mac and delete this. |
| clipboard.pasteboard().writeSelection(*selectionRange, src.editor().canSmartCopyOrDelete(), src, IncludeImageAltTextForClipboard); |
| #endif |
| } |
| |
| src.editor().didWriteSelectionToPasteboard(); |
| } |
| m_client.willPerformDragSourceAction(DragSourceActionSelection, dragOrigin, clipboard); |
| if (!dragImage) { |
| dragImage = dissolveDragImageToFraction(src.dragImageForSelection(), DragImageAlpha); |
| dragLoc = dragLocForSelectionDrag(src); |
| m_dragOffset = IntPoint(dragOrigin.x() - dragLoc.x(), dragOrigin.y() - dragLoc.y()); |
| } |
| doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); |
| } else if (!imageURL.isEmpty() && image && !image->isNull() && (m_dragSourceAction & DragSourceActionImage)) { |
| // We shouldn't be starting a drag for an image that can't provide an extension. |
| // This is an early detection for problems encountered later upon drop. |
| ASSERT(!image->filenameExtension().isEmpty()); |
| if (!clipboard.pasteboard().hasData()) { |
| m_draggingImageURL = imageURL; |
| if (element.isContentRichlyEditable()) |
| selectElement(element); |
| declareAndWriteDragImage(clipboard, element, !linkURL.isEmpty() ? linkURL : imageURL, hitTestResult.altDisplayString()); |
| } |
| |
| m_client.willPerformDragSourceAction(DragSourceActionImage, dragOrigin, clipboard); |
| |
| if (!dragImage) { |
| IntRect imageRect = hitTestResult.imageRect(); |
| imageRect.setLocation(m_page.mainFrame().view()->rootViewToContents(src.view()->contentsToRootView(imageRect.location()))); |
| doImageDrag(element, dragOrigin, hitTestResult.imageRect(), clipboard, src, m_dragOffset); |
| } else { |
| // DHTML defined drag image |
| doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); |
| } |
| } else if (!linkURL.isEmpty() && (m_dragSourceAction & DragSourceActionLink)) { |
| if (!clipboard.pasteboard().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. |
| src.editor().copyURL(linkURL, hitTestResult.textContent().simplifyWhiteSpace(), clipboard.pasteboard()); |
| |
| if (src.selection().isCaret() && src.selection().isContentEditable()) { |
| // a user can initiate a drag on a link without having any text |
| // selected. In this case, we should expand the selection to |
| // the enclosing anchor element |
| Position pos = src.selection().base(); |
| Node* node = enclosingAnchorElement(pos); |
| if (node) |
| src.selection().setSelection(VisibleSelection::selectionFromContentsOfNode(node)); |
| } |
| |
| m_client.willPerformDragSourceAction(DragSourceActionLink, dragOrigin, clipboard); |
| if (!dragImage) { |
| dragImage = createDragImageForLink(linkURL, hitTestResult.textContent(), src.settings().fontRenderingMode()); |
| IntSize size = dragImageSize(dragImage); |
| m_dragOffset = IntPoint(-size.width() / 2, -LinkDragBorderInset); |
| dragLoc = IntPoint(mouseDraggedPoint.x() + m_dragOffset.x(), mouseDraggedPoint.y() + m_dragOffset.y()); |
| } |
| doSystemDrag(dragImage, dragLoc, mouseDraggedPoint, clipboard, src, true); |
| } else if (state.type == DragSourceActionDHTML) { |
| if (dragImage) { |
| ASSERT(m_dragSourceAction & DragSourceActionDHTML); |
| m_client.willPerformDragSourceAction(DragSourceActionDHTML, dragOrigin, clipboard); |
| doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); |
| } else |
| startedDrag = false; |
| } else { |
| // draggableElement() determined an image or link node was draggable, but it turns out the |
| // image or link had no URL, so there is nothing to drag. |
| startedDrag = false; |
| } |
| |
| if (dragImage) |
| deleteDragImage(dragImage); |
| return startedDrag; |
| } |
| |
| void DragController::doImageDrag(Element& element, const IntPoint& dragOrigin, const IntRect& rect, Clipboard& clipboard, Frame& frame, IntPoint& dragImageOffset) |
| { |
| IntPoint mouseDownPoint = dragOrigin; |
| DragImageRef dragImage = 0; |
| IntPoint origin; |
| |
| if (!element.renderer()) |
| return; |
| |
| ImageOrientationDescription orientationDescription(element.renderer()->shouldRespectImageOrientation()); |
| #if ENABLE(CSS_IMAGE_ORIENTATION) |
| orientationDescription.setImageOrientationEnum(element.renderer()->style().imageOrientation()); |
| #endif |
| |
| Image* image = getImage(element); |
| if (image && image->size().height() * image->size().width() <= MaxOriginalImageArea |
| && (dragImage = createDragImageFromImage(image, element.renderer() ? orientationDescription : ImageOrientationDescription()))) { |
| IntSize originalSize = rect.size(); |
| origin = rect.location(); |
| |
| dragImage = fitDragImageToMaxSize(dragImage, rect.size(), maxDragImageSize()); |
| dragImage = dissolveDragImageToFraction(dragImage, DragImageAlpha); |
| IntSize newSize = dragImageSize(dragImage); |
| |
| // Properly orient the drag image and orient it differently if it's smaller than the original |
| float scale = newSize.width() / (float)originalSize.width(); |
| float dx = origin.x() - mouseDownPoint.x(); |
| dx *= scale; |
| origin.setX((int)(dx + 0.5)); |
| #if PLATFORM(MAC) |
| //Compensate for accursed flipped coordinates in cocoa |
| origin.setY(origin.y() + originalSize.height()); |
| #endif |
| float dy = origin.y() - mouseDownPoint.y(); |
| dy *= scale; |
| origin.setY((int)(dy + 0.5)); |
| } else { |
| if (CachedImage* cachedImage = getCachedImage(element)) { |
| dragImage = createDragImageIconForCachedImageFilename(cachedImage->response().suggestedFilename()); |
| if (dragImage) |
| origin = IntPoint(DragIconRightInset - dragImageSize(dragImage).width(), DragIconBottomInset); |
| } |
| } |
| |
| dragImageOffset = mouseDownPoint + origin; |
| doSystemDrag(dragImage, dragImageOffset, dragOrigin, clipboard, frame, false); |
| |
| deleteDragImage(dragImage); |
| } |
| |
| void DragController::doSystemDrag(DragImageRef image, const IntPoint& dragLoc, const IntPoint& eventPos, Clipboard& clipboard, Frame& frame, bool forLink) |
| { |
| m_didInitiateDrag = true; |
| m_dragInitiator = frame.document(); |
| // Protect this frame and view, as a load may occur mid drag and attempt to unload this frame |
| Ref<MainFrame> frameProtector(m_page.mainFrame()); |
| RefPtr<FrameView> viewProtector = frameProtector->view(); |
| m_client.startDrag(image, viewProtector->rootViewToContents(frame.view()->contentsToRootView(dragLoc)), |
| viewProtector->rootViewToContents(frame.view()->contentsToRootView(eventPos)), clipboard, frameProtector.get(), forLink); |
| // DragClient::startDrag can cause our Page to dispear, deallocating |this|. |
| if (!frameProtector->page()) |
| return; |
| |
| cleanupAfterSystemDrag(); |
| } |
| |
| // Manual drag caret manipulation |
| void DragController::placeDragCaret(const IntPoint& windowPoint) |
| { |
| mouseMovedIntoDocument(m_page.mainFrame().documentAtPoint(windowPoint)); |
| if (!m_documentUnderMouse) |
| return; |
| Frame* frame = m_documentUnderMouse->frame(); |
| FrameView* frameView = frame->view(); |
| if (!frameView) |
| return; |
| IntPoint framePoint = frameView->windowToContents(windowPoint); |
| |
| m_page.dragCaretController().setCaretPosition(frame->visiblePositionForPoint(framePoint)); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(DRAG_SUPPORT) |
