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Diffstat (limited to 'Source/WebCore/page/DragController.cpp')
| -rw-r--r-- | Source/WebCore/page/DragController.cpp | 852 |
1 files changed, 852 insertions, 0 deletions
diff --git a/Source/WebCore/page/DragController.cpp b/Source/WebCore/page/DragController.cpp new file mode 100644 index 0000000..d0e9a8c --- /dev/null +++ b/Source/WebCore/page/DragController.cpp @@ -0,0 +1,852 @@ +/* + * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" +#include "DragController.h" + +#if ENABLE(DRAG_SUPPORT) +#include "CSSStyleDeclaration.h" +#include "Clipboard.h" +#include "ClipboardAccessPolicy.h" +#include "CachedResourceLoader.h" +#include "Document.h" +#include "DocumentFragment.h" +#include "DragActions.h" +#include "DragClient.h" +#include "DragData.h" +#include "Editor.h" +#include "EditorClient.h" +#include "Element.h" +#include "EventHandler.h" +#include "FloatRect.h" +#include "Frame.h" +#include "FrameLoader.h" +#include "FrameView.h" +#include "HTMLAnchorElement.h" +#include "HTMLInputElement.h" +#include "HTMLNames.h" +#include "HitTestRequest.h" +#include "HitTestResult.h" +#include "Image.h" +#include "MoveSelectionCommand.h" +#include "Node.h" +#include "Page.h" +#include "PlatformKeyboardEvent.h" +#include "RenderFileUploadControl.h" +#include "RenderImage.h" +#include "RenderLayer.h" +#include "RenderView.h" +#include "ReplaceSelectionCommand.h" +#include "ResourceRequest.h" +#include "SelectionController.h" +#include "Settings.h" +#include "Text.h" +#include "TextEvent.h" +#include "htmlediting.h" +#include "markup.h" +#include <wtf/CurrentTime.h> +#include <wtf/RefPtr.h> + +namespace WebCore { + +static PlatformMouseEvent createMouseEvent(DragData* dragData) +{ + bool shiftKey, ctrlKey, altKey, metaKey; + shiftKey = ctrlKey = altKey = metaKey = false; + PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey); + return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(), + LeftButton, MouseEventMoved, 0, shiftKey, ctrlKey, altKey, + metaKey, currentTime()); +} + +DragController::DragController(Page* page, DragClient* client) + : m_page(page) + , m_client(client) + , m_documentUnderMouse(0) + , m_dragInitiator(0) + , m_dragDestinationAction(DragDestinationActionNone) + , m_dragSourceAction(DragSourceActionNone) + , m_didInitiateDrag(false) + , m_isHandlingDrag(false) + , m_sourceDragOperation(DragOperationNone) +{ +} + +DragController::~DragController() +{ + m_client->dragControllerDestroyed(); +} + +static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragData, RefPtr<Range> context, + bool allowPlainText, bool& chosePlainText) +{ + ASSERT(dragData); + chosePlainText = false; + + Document* document = context->ownerDocument(); + ASSERT(document); + if (document && dragData->containsCompatibleContent()) { + if (PassRefPtr<DocumentFragment> fragment = dragData->asFragment(document)) + return fragment; + + if (dragData->containsURL(DragData::DoNotConvertFilenames)) { + String title; + String url = dragData->asURL(DragData::DoNotConvertFilenames, &title); + if (!url.isEmpty()) { + RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(document); + anchor->setHref(url); + if (title.isEmpty()) { + // Try the plain text first because the url might be normalized or escaped. + if (dragData->containsPlainText()) + title = dragData->asPlainText(); + if (title.isEmpty()) + title = url; + } + RefPtr<Node> anchorText = document->createTextNode(title); + ExceptionCode ec; + anchor->appendChild(anchorText, ec); + RefPtr<DocumentFragment> fragment = document->createDocumentFragment(); + fragment->appendChild(anchor, ec); + return fragment.get(); + } + } + } + if (allowPlainText && dragData->containsPlainText()) { + chosePlainText = true; + return createFragmentFromText(context.get(), dragData->asPlainText()).get(); + } + + return 0; +} + +bool DragController::dragIsMove(SelectionController* selection) +{ + return m_documentUnderMouse == m_dragInitiator && selection->isContentEditable() && !isCopyKeyDown(); +} + +// FIXME: This method is poorly named. We're just clearing the selection from the document this drag is exiting. +void DragController::cancelDrag() +{ + m_page->dragCaretController()->clear(); +} + +void DragController::dragEnded() +{ + m_dragInitiator = 0; + m_didInitiateDrag = false; + m_page->dragCaretController()->clear(); +} + +DragOperation DragController::dragEntered(DragData* dragData) +{ + return dragEnteredOrUpdated(dragData); +} + +void DragController::dragExited(DragData* dragData) +{ + ASSERT(dragData); + Frame* mainFrame = m_page->mainFrame(); + + if (RefPtr<FrameView> v = mainFrame->view()) { + ClipboardAccessPolicy policy = (!m_documentUnderMouse || m_documentUnderMouse->securityOrigin()->isLocal()) ? ClipboardReadable : ClipboardTypesReadable; + RefPtr<Clipboard> clipboard = Clipboard::create(policy, dragData, mainFrame); + clipboard->setSourceOperation(dragData->draggingSourceOperationMask()); + mainFrame->eventHandler()->cancelDragAndDrop(createMouseEvent(dragData), clipboard.get()); + clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security + } + mouseMovedIntoDocument(0); +} + +DragOperation DragController::dragUpdated(DragData* dragData) +{ + return dragEnteredOrUpdated(dragData); +} + +bool DragController::performDrag(DragData* dragData) +{ + ASSERT(dragData); + m_documentUnderMouse = m_page->mainFrame()->documentAtPoint(dragData->clientPosition()); + if (m_isHandlingDrag) { + ASSERT(m_dragDestinationAction & DragDestinationActionDHTML); + m_client->willPerformDragDestinationAction(DragDestinationActionDHTML, dragData); + RefPtr<Frame> mainFrame = m_page->mainFrame(); + if (mainFrame->view()) { + // Sending an event can result in the destruction of the view and part. + RefPtr<Clipboard> clipboard = Clipboard::create(ClipboardReadable, dragData, mainFrame.get()); + clipboard->setSourceOperation(dragData->draggingSourceOperationMask()); + mainFrame->eventHandler()->performDragAndDrop(createMouseEvent(dragData), clipboard.get()); + clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security + } + m_documentUnderMouse = 0; + return true; + } + + if ((m_dragDestinationAction & DragDestinationActionEdit) && concludeEditDrag(dragData)) { + m_documentUnderMouse = 0; + return true; + } + + m_documentUnderMouse = 0; + + if (operationForLoad(dragData) == DragOperationNone) + return false; + + m_client->willPerformDragDestinationAction(DragDestinationActionLoad, dragData); + m_page->mainFrame()->loader()->load(ResourceRequest(dragData->asURL()), false); + return true; +} + +void DragController::mouseMovedIntoDocument(Document* newDocument) +{ + if (m_documentUnderMouse == newDocument) + return; + + // If we were over another document clear the selection + if (m_documentUnderMouse) + cancelDrag(); + m_documentUnderMouse = newDocument; +} + +DragOperation DragController::dragEnteredOrUpdated(DragData* dragData) +{ + ASSERT(dragData); + ASSERT(m_page->mainFrame()); // It is not possible in Mac WebKit to have a Page without a mainFrame() + mouseMovedIntoDocument(m_page->mainFrame()->documentAtPoint(dragData->clientPosition())); + + m_dragDestinationAction = m_client->actionMaskForDrag(dragData); + if (m_dragDestinationAction == DragDestinationActionNone) { + cancelDrag(); // FIXME: Why not call mouseMovedIntoDocument(0)? + return DragOperationNone; + } + + DragOperation operation = DragOperationNone; + bool handledByDocument = tryDocumentDrag(dragData, m_dragDestinationAction, operation); + if (!handledByDocument && (m_dragDestinationAction & DragDestinationActionLoad)) + return operationForLoad(dragData); + return operation; +} + +static HTMLInputElement* asFileInput(Node* node) +{ + ASSERT(node); + + // The button for a FILE input is a sub element with no set input type + // In order to get around this problem we assume any non-FILE input element + // is this internal button, and try querying the shadow parent node. + if (node->hasTagName(HTMLNames::inputTag) && node->isShadowRoot() && !static_cast<HTMLInputElement*>(node)->isFileUpload()) + node = node->shadowHost(); + + if (!node || !node->hasTagName(HTMLNames::inputTag)) + return 0; + + HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(node); + if (!inputElement->isFileUpload()) + return 0; + + return inputElement; +} + +// This can return null if an empty document is loaded. +static Element* elementUnderMouse(Document* documentUnderMouse, const IntPoint& p) +{ + Frame* frame = documentUnderMouse->frame(); + float zoomFactor = frame ? frame->pageZoomFactor() : 1; + IntPoint point = roundedIntPoint(FloatPoint(p.x() * zoomFactor, p.y() * zoomFactor)); + + HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active); + HitTestResult result(point); + documentUnderMouse->renderView()->layer()->hitTest(request, result); + + Node* n = result.innerNode(); + while (n && !n->isElementNode()) + n = n->parentNode(); + if (n) + n = n->shadowAncestorNode(); + + return static_cast<Element*>(n); +} + +bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction actionMask, DragOperation& operation) +{ + ASSERT(dragData); + + if (!m_documentUnderMouse) + return false; + + if (m_dragInitiator && !m_documentUnderMouse->securityOrigin()->canReceiveDragData(m_dragInitiator->securityOrigin())) + return false; + + m_isHandlingDrag = false; + if (actionMask & DragDestinationActionDHTML) { + m_isHandlingDrag = tryDHTMLDrag(dragData, operation); + // Do not continue if m_documentUnderMouse has been reset by tryDHTMLDrag. + // tryDHTMLDrag fires dragenter event. The event listener that listens + // to this event may create a nested message loop (open a modal dialog), + // which could process dragleave event and reset m_documentUnderMouse in + // dragExited. + if (!m_documentUnderMouse) + return false; + } + + // It's unclear why this check is after tryDHTMLDrag. + // We send drag events in tryDHTMLDrag and that may be the reason. + RefPtr<FrameView> frameView = m_documentUnderMouse->view(); + if (!frameView) + return false; + + if (m_isHandlingDrag) { + m_page->dragCaretController()->clear(); + return true; + } else if ((actionMask & DragDestinationActionEdit) && canProcessDrag(dragData)) { + if (dragData->containsColor()) { + operation = DragOperationGeneric; + return true; + } + + IntPoint point = frameView->windowToContents(dragData->clientPosition()); + Element* element = elementUnderMouse(m_documentUnderMouse.get(), point); + if (!element) + return false; + if (!asFileInput(element)) { + VisibleSelection dragCaret = m_documentUnderMouse->frame()->visiblePositionForPoint(point); + m_page->dragCaretController()->setSelection(dragCaret); + } + + Frame* innerFrame = element->document()->frame(); + operation = dragIsMove(innerFrame->selection()) ? DragOperationMove : DragOperationCopy; + return true; + } + // If we're not over an editable region, make sure we're clearing any prior drag cursor. + m_page->dragCaretController()->clear(); + return false; +} + +DragSourceAction DragController::delegateDragSourceAction(const IntPoint& windowPoint) +{ + m_dragSourceAction = m_client->dragSourceActionMaskForPoint(windowPoint); + return m_dragSourceAction; +} + +DragOperation DragController::operationForLoad(DragData* dragData) +{ + ASSERT(dragData); + Document* doc = m_page->mainFrame()->documentAtPoint(dragData->clientPosition()); + if (doc && (m_didInitiateDrag || doc->isPluginDocument() || (doc->frame() && doc->frame()->editor()->clientIsEditable()))) + return DragOperationNone; + return dragOperation(dragData); +} + +static bool setSelectionToDragCaret(Frame* frame, VisibleSelection& dragCaret, RefPtr<Range>& range, const IntPoint& point) +{ + frame->selection()->setSelection(dragCaret); + if (frame->selection()->isNone()) { + dragCaret = frame->visiblePositionForPoint(point); + frame->selection()->setSelection(dragCaret); + range = dragCaret.toNormalizedRange(); + } + return !frame->selection()->isNone() && frame->selection()->isContentEditable(); +} + +bool DragController::dispatchTextInputEventFor(Frame* innerFrame, DragData* dragData) +{ + VisibleSelection dragCaret(m_page->dragCaretController()->selection()); + String text = dragCaret.isContentRichlyEditable() ? "" : dragData->asPlainText(); + Node* target = innerFrame->editor()->findEventTargetFrom(dragCaret); + ExceptionCode ec = 0; + return target->dispatchEvent(TextEvent::createForDrop(innerFrame->domWindow(), text), ec); +} + +bool DragController::concludeEditDrag(DragData* dragData) +{ + ASSERT(dragData); + ASSERT(!m_isHandlingDrag); + + if (!m_documentUnderMouse) + return false; + + IntPoint point = m_documentUnderMouse->view()->windowToContents(dragData->clientPosition()); + Element* element = elementUnderMouse(m_documentUnderMouse.get(), point); + if (!element) + return false; + Frame* innerFrame = element->ownerDocument()->frame(); + ASSERT(innerFrame); + + if (!dispatchTextInputEventFor(innerFrame, dragData)) + return true; + + if (dragData->containsColor()) { + Color color = dragData->asColor(); + if (!color.isValid()) + return false; + RefPtr<Range> innerRange = innerFrame->selection()->toNormalizedRange(); + RefPtr<CSSStyleDeclaration> style = m_documentUnderMouse->createCSSStyleDeclaration(); + ExceptionCode ec; + style->setProperty("color", color.name(), ec); + if (!innerFrame->editor()->shouldApplyStyle(style.get(), innerRange.get())) + return false; + m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData); + innerFrame->editor()->applyStyle(style.get(), EditActionSetColor); + return true; + } + + if (!m_page->dragController()->canProcessDrag(dragData)) { + m_page->dragCaretController()->clear(); + return false; + } + + if (HTMLInputElement* fileInput = asFileInput(element)) { + if (fileInput->disabled()) + return false; + + if (!dragData->containsFiles()) + return false; + + Vector<String> filenames; + dragData->asFilenames(filenames); + if (filenames.isEmpty()) + return false; + + // Ugly. For security none of the APIs available to us can set the input value + // on file inputs. Even forcing a change in HTMLInputElement doesn't work as + // RenderFileUploadControl clears the file when doing updateFromElement(). + RenderFileUploadControl* renderer = toRenderFileUploadControl(fileInput->renderer()); + if (!renderer) + return false; + + renderer->receiveDroppedFiles(filenames); + return true; + } + + VisibleSelection dragCaret(m_page->dragCaretController()->selection()); + m_page->dragCaretController()->clear(); + RefPtr<Range> range = dragCaret.toNormalizedRange(); + + // For range to be null a WebKit client must have done something bad while + // manually controlling drag behaviour + if (!range) + return false; + CachedResourceLoader* cachedResourceLoader = range->ownerDocument()->cachedResourceLoader(); + cachedResourceLoader->setAllowStaleResources(true); + if (dragIsMove(innerFrame->selection()) || dragCaret.isContentRichlyEditable()) { + bool chosePlainText = false; + RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, range, true, chosePlainText); + if (!fragment || !innerFrame->editor()->shouldInsertFragment(fragment, range, EditorInsertActionDropped)) { + cachedResourceLoader->setAllowStaleResources(false); + return false; + } + + m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData); + if (dragIsMove(innerFrame->selection())) { + // NSTextView behavior is to always smart delete on moving a selection, + // but only to smart insert if the selection granularity is word granularity. + bool smartDelete = innerFrame->editor()->smartInsertDeleteEnabled(); + bool smartInsert = smartDelete && innerFrame->selection()->granularity() == WordGranularity && dragData->canSmartReplace(); + applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete)); + } else { + if (setSelectionToDragCaret(innerFrame, dragCaret, range, point)) + applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), fragment, true, dragData->canSmartReplace(), chosePlainText)); + } + } else { + String text = dragData->asPlainText(); + if (text.isEmpty() || !innerFrame->editor()->shouldInsertText(text, range.get(), EditorInsertActionDropped)) { + cachedResourceLoader->setAllowStaleResources(false); + return false; + } + + m_client->willPerformDragDestinationAction(DragDestinationActionEdit, dragData); + if (setSelectionToDragCaret(innerFrame, dragCaret, range, point)) + applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), createFragmentFromText(range.get(), text), true, false, true)); + } + cachedResourceLoader->setAllowStaleResources(false); + + return true; +} + +bool DragController::canProcessDrag(DragData* dragData) +{ + ASSERT(dragData); + + if (!dragData->containsCompatibleContent()) + return false; + + IntPoint point = m_page->mainFrame()->view()->windowToContents(dragData->clientPosition()); + HitTestResult result = HitTestResult(point); + if (!m_page->mainFrame()->contentRenderer()) + return false; + + result = m_page->mainFrame()->eventHandler()->hitTestResultAtPoint(point, true); + + if (!result.innerNonSharedNode()) + return false; + + if (dragData->containsFiles() && asFileInput(result.innerNonSharedNode())) + return true; + + if (!result.innerNonSharedNode()->isContentEditable()) + return false; + + if (m_didInitiateDrag && m_documentUnderMouse == m_dragInitiator && result.isSelected()) + return false; + + return true; +} + +static DragOperation defaultOperationForDrag(DragOperation srcOpMask) +{ + // This is designed to match IE's operation fallback for the case where + // the page calls preventDefault() in a drag event but doesn't set dropEffect. + if (srcOpMask == DragOperationEvery) + return DragOperationCopy; + if (srcOpMask == DragOperationNone) + return DragOperationNone; + if (srcOpMask & DragOperationMove || srcOpMask & DragOperationGeneric) + return DragOperationMove; + if (srcOpMask & DragOperationCopy) + return DragOperationCopy; + if (srcOpMask & DragOperationLink) + return DragOperationLink; + + // FIXME: Does IE really return "generic" even if no operations were allowed by the source? + return DragOperationGeneric; +} + +bool DragController::tryDHTMLDrag(DragData* dragData, DragOperation& operation) +{ + ASSERT(dragData); + ASSERT(m_documentUnderMouse); + RefPtr<Frame> mainFrame = m_page->mainFrame(); + RefPtr<FrameView> viewProtector = mainFrame->view(); + if (!viewProtector) + return false; + + ClipboardAccessPolicy policy = m_documentUnderMouse->securityOrigin()->isLocal() ? ClipboardReadable : ClipboardTypesReadable; + RefPtr<Clipboard> clipboard = Clipboard::create(policy, dragData, mainFrame.get()); + DragOperation srcOpMask = dragData->draggingSourceOperationMask(); + clipboard->setSourceOperation(srcOpMask); + + PlatformMouseEvent event = createMouseEvent(dragData); + if (!mainFrame->eventHandler()->updateDragAndDrop(event, clipboard.get())) { + clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security + return false; + } + + operation = clipboard->destinationOperation(); + if (clipboard->dropEffectIsUninitialized()) + operation = defaultOperationForDrag(srcOpMask); + else if (!(srcOpMask & operation)) { + // The element picked an operation which is not supported by the source + operation = DragOperationNone; + } + + clipboard->setAccessPolicy(ClipboardNumb); // invalidate clipboard here for security + return true; +} + +bool DragController::mayStartDragAtEventLocation(const Frame* frame, const IntPoint& framePos, Node* node) +{ + ASSERT(frame); + ASSERT(frame->settings()); + + if (!frame->view() || !frame->contentRenderer()) + return false; + + HitTestResult mouseDownTarget = HitTestResult(framePos); + + mouseDownTarget = frame->eventHandler()->hitTestResultAtPoint(framePos, true); + if (node) + mouseDownTarget.setInnerNonSharedNode(node); + + if (mouseDownTarget.image() + && !mouseDownTarget.absoluteImageURL().isEmpty() + && frame->settings()->loadsImagesAutomatically() + && m_dragSourceAction & DragSourceActionImage) + return true; + + if (!mouseDownTarget.absoluteLinkURL().isEmpty() + && m_dragSourceAction & DragSourceActionLink + && mouseDownTarget.isLiveLink() + && mouseDownTarget.URLElement()->renderer() && mouseDownTarget.URLElement()->renderer()->style()->userDrag() != DRAG_NONE) + return true; + + if (mouseDownTarget.isSelected() + && m_dragSourceAction & DragSourceActionSelection) + return true; + + return false; +} + +static CachedImage* getCachedImage(Element* element) +{ + ASSERT(element); + RenderObject* renderer = element->renderer(); + if (!renderer || !renderer->isImage()) + return 0; + RenderImage* image = toRenderImage(renderer); + return image->cachedImage(); +} + +static Image* getImage(Element* element) +{ + ASSERT(element); + CachedImage* cachedImage = getCachedImage(element); + return (cachedImage && !cachedImage->errorOccurred()) ? + cachedImage->image() : 0; +} + +static void prepareClipboardForImageDrag(Frame* src, Clipboard* clipboard, Element* node, const KURL& linkURL, const KURL& imageURL, const String& label) +{ + RefPtr<Range> range = src->document()->createRange(); + ExceptionCode ec = 0; + range->selectNode(node, ec); + ASSERT(!ec); + src->selection()->setSelection(VisibleSelection(range.get(), DOWNSTREAM)); + clipboard->declareAndWriteDragImage(node, !linkURL.isEmpty() ? linkURL : imageURL, label, src); +} + +static IntPoint dragLocForDHTMLDrag(const IntPoint& mouseDraggedPoint, const IntPoint& dragOrigin, const IntPoint& dragImageOffset, bool isLinkImage) +{ + // dragImageOffset is the cursor position relative to the lower-left corner of the image. +#if PLATFORM(MAC) + // We add in the Y dimension because we are a flipped view, so adding moves the image down. + const int yOffset = dragImageOffset.y(); +#else + const int yOffset = -dragImageOffset.y(); +#endif + + if (isLinkImage) + return IntPoint(mouseDraggedPoint.x() - dragImageOffset.x(), mouseDraggedPoint.y() + yOffset); + + return IntPoint(dragOrigin.x() - dragImageOffset.x(), dragOrigin.y() + yOffset); +} + +static IntPoint dragLocForSelectionDrag(Frame* src) +{ + IntRect draggingRect = enclosingIntRect(src->selection()->bounds()); + int xpos = draggingRect.right(); + xpos = draggingRect.x() < xpos ? draggingRect.x() : xpos; + int ypos = draggingRect.bottom(); +#if PLATFORM(MAC) + // Deal with flipped coordinates on Mac + ypos = draggingRect.y() > ypos ? draggingRect.y() : ypos; +#else + ypos = draggingRect.y() < ypos ? draggingRect.y() : ypos; +#endif + return IntPoint(xpos, ypos); +} + +bool DragController::startDrag(Frame* src, Clipboard* clipboard, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin, bool isDHTMLDrag) +{ + ASSERT(src); + ASSERT(clipboard); + + if (!src->view() || !src->contentRenderer()) + return false; + + HitTestResult dragSource = HitTestResult(dragOrigin); + dragSource = src->eventHandler()->hitTestResultAtPoint(dragOrigin, true); + KURL linkURL = dragSource.absoluteLinkURL(); + KURL imageURL = dragSource.absoluteImageURL(); + bool isSelected = dragSource.isSelected(); + + IntPoint mouseDraggedPoint = src->view()->windowToContents(dragEvent.pos()); + + m_draggingImageURL = KURL(); + m_sourceDragOperation = srcOp; + + DragImageRef dragImage = 0; + IntPoint dragLoc(0, 0); + IntPoint dragImageOffset(0, 0); + + if (isDHTMLDrag) + dragImage = clipboard->createDragImage(dragImageOffset); + else { + // This drag operation is not a DHTML drag and may go outside the WebView. + // We provide a default set of allowed drag operations that follows from: + // http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebHTMLView.mm?rev=48526#L3430 + m_sourceDragOperation = (DragOperation)(DragOperationGeneric | DragOperationCopy); + } + + // We allow DHTML/JS to set the drag image, even if its a link, image or text we're dragging. + // This is in the spirit of the IE API, which allows overriding of pasteboard data and DragOp. + if (dragImage) { + dragLoc = dragLocForDHTMLDrag(mouseDraggedPoint, dragOrigin, dragImageOffset, !linkURL.isEmpty()); + m_dragOffset = dragImageOffset; + } + + bool startedDrag = true; // optimism - we almost always manage to start the drag + + Node* node = dragSource.innerNonSharedNode(); + + Image* image = getImage(static_cast<Element*>(node)); + if (!imageURL.isEmpty() && node && node->isElementNode() && image + && (m_dragSourceAction & DragSourceActionImage)) { + // We shouldn't be starting a drag for an image that can't provide an extension. + // This is an early detection for problems encountered later upon drop. + ASSERT(!image->filenameExtension().isEmpty()); + Element* element = static_cast<Element*>(node); + if (!clipboard->hasData()) { + m_draggingImageURL = imageURL; + prepareClipboardForImageDrag(src, clipboard, element, linkURL, imageURL, dragSource.altDisplayString()); + } + + m_client->willPerformDragSourceAction(DragSourceActionImage, dragOrigin, clipboard); + + if (!dragImage) { + IntRect imageRect = dragSource.imageRect(); + imageRect.setLocation(m_page->mainFrame()->view()->windowToContents(src->view()->contentsToWindow(imageRect.location()))); + doImageDrag(element, dragOrigin, dragSource.imageRect(), clipboard, src, m_dragOffset); + } else + // DHTML defined drag image + doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); + + } else if (!linkURL.isEmpty() && (m_dragSourceAction & DragSourceActionLink)) { + if (!clipboard->hasData()) + // Simplify whitespace so the title put on the clipboard resembles what the user sees + // on the web page. This includes replacing newlines with spaces. + clipboard->writeURL(linkURL, dragSource.textContent().simplifyWhiteSpace(), src); + + if (src->selection()->isCaret() && src->selection()->isContentEditable()) { + // a user can initiate a drag on a link without having any text + // selected. In this case, we should expand the selection to + // the enclosing anchor element + Position pos = src->selection()->base(); + Node* node = enclosingAnchorElement(pos); + if (node) + src->selection()->setSelection(VisibleSelection::selectionFromContentsOfNode(node)); + } + + m_client->willPerformDragSourceAction(DragSourceActionLink, dragOrigin, clipboard); + if (!dragImage) { + dragImage = m_client->createDragImageForLink(linkURL, dragSource.textContent(), src); + IntSize size = dragImageSize(dragImage); + m_dragOffset = IntPoint(-size.width() / 2, -LinkDragBorderInset); + dragLoc = IntPoint(mouseDraggedPoint.x() + m_dragOffset.x(), mouseDraggedPoint.y() + m_dragOffset.y()); + } + doSystemDrag(dragImage, dragLoc, mouseDraggedPoint, clipboard, src, true); + } else if (isSelected && (m_dragSourceAction & DragSourceActionSelection)) { + if (!clipboard->hasData()) { + if (isNodeInTextFormControl(src->selection()->start().node())) + clipboard->writePlainText(src->editor()->selectedText()); + else { + RefPtr<Range> selectionRange = src->selection()->toNormalizedRange(); + ASSERT(selectionRange); + + clipboard->writeRange(selectionRange.get(), src); + } + } + m_client->willPerformDragSourceAction(DragSourceActionSelection, dragOrigin, clipboard); + if (!dragImage) { + dragImage = createDragImageForSelection(src); + dragLoc = dragLocForSelectionDrag(src); + m_dragOffset = IntPoint((int)(dragOrigin.x() - dragLoc.x()), (int)(dragOrigin.y() - dragLoc.y())); + } + doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); + } else if (isDHTMLDrag) { + ASSERT(m_dragSourceAction & DragSourceActionDHTML); + m_client->willPerformDragSourceAction(DragSourceActionDHTML, dragOrigin, clipboard); + doSystemDrag(dragImage, dragLoc, dragOrigin, clipboard, src, false); + } else { + // Only way I know to get here is if to get here is if the original element clicked on in the mousedown is no longer + // under the mousedown point, so linkURL, imageURL and isSelected are all false/empty. + startedDrag = false; + } + + if (dragImage) + deleteDragImage(dragImage); + return startedDrag; +} + +void DragController::doImageDrag(Element* element, const IntPoint& dragOrigin, const IntRect& rect, Clipboard* clipboard, Frame* frame, IntPoint& dragImageOffset) +{ + IntPoint mouseDownPoint = dragOrigin; + DragImageRef dragImage; + IntPoint origin; + + Image* image = getImage(element); + if (image && image->size().height() * image->size().width() <= MaxOriginalImageArea + && (dragImage = createDragImageFromImage(image))) { + IntSize originalSize = rect.size(); + origin = rect.location(); + + dragImage = fitDragImageToMaxSize(dragImage, rect.size(), maxDragImageSize()); + dragImage = dissolveDragImageToFraction(dragImage, DragImageAlpha); + IntSize newSize = dragImageSize(dragImage); + + // Properly orient the drag image and orient it differently if it's smaller than the original + float scale = newSize.width() / (float)originalSize.width(); + float dx = origin.x() - mouseDownPoint.x(); + dx *= scale; + origin.setX((int)(dx + 0.5)); +#if PLATFORM(MAC) + //Compensate for accursed flipped coordinates in cocoa + origin.setY(origin.y() + originalSize.height()); +#endif + float dy = origin.y() - mouseDownPoint.y(); + dy *= scale; + origin.setY((int)(dy + 0.5)); + } else { + dragImage = createDragImageIconForCachedImage(getCachedImage(element)); + if (dragImage) + origin = IntPoint(DragIconRightInset - dragImageSize(dragImage).width(), DragIconBottomInset); + } + + dragImageOffset.setX(mouseDownPoint.x() + origin.x()); + dragImageOffset.setY(mouseDownPoint.y() + origin.y()); + doSystemDrag(dragImage, dragImageOffset, dragOrigin, clipboard, frame, false); + + deleteDragImage(dragImage); +} + +void DragController::doSystemDrag(DragImageRef image, const IntPoint& dragLoc, const IntPoint& eventPos, Clipboard* clipboard, Frame* frame, bool forLink) +{ + m_didInitiateDrag = true; + m_dragInitiator = frame->document(); + // Protect this frame and view, as a load may occur mid drag and attempt to unload this frame + RefPtr<Frame> frameProtector = m_page->mainFrame(); + RefPtr<FrameView> viewProtector = frameProtector->view(); + m_client->startDrag(image, viewProtector->windowToContents(frame->view()->contentsToWindow(dragLoc)), + viewProtector->windowToContents(frame->view()->contentsToWindow(eventPos)), clipboard, frameProtector.get(), forLink); + + cleanupAfterSystemDrag(); +} + +// Manual drag caret manipulation +void DragController::placeDragCaret(const IntPoint& windowPoint) +{ + mouseMovedIntoDocument(m_page->mainFrame()->documentAtPoint(windowPoint)); + if (!m_documentUnderMouse) + return; + Frame* frame = m_documentUnderMouse->frame(); + FrameView* frameView = frame->view(); + if (!frameView) + return; + IntPoint framePoint = frameView->windowToContents(windowPoint); + VisibleSelection dragCaret(frame->visiblePositionForPoint(framePoint)); + m_page->dragCaretController()->setSelection(dragCaret); +} + +} // namespace WebCore + +#endif // ENABLE(DRAG_SUPPORT) |