/* * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org) * * 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 "EventHandler.h" #include "CachedImage.h" #include "ChromeClient.h" #include "Cursor.h" #include "Document.h" #include "DragController.h" #include "Editor.h" #include "EventNames.h" #include "FloatPoint.h" #include "FocusController.h" #include "Frame.h" #include "FrameLoader.h" #include "FrameTree.h" #include "FrameView.h" #include "HitTestRequest.h" #include "HitTestResult.h" #include "HTMLFrameSetElement.h" #include "HTMLFrameElementBase.h" #include "HTMLInputElement.h" #include "HTMLNames.h" #include "Image.h" #include "KeyboardEvent.h" #include "MouseEvent.h" #include "MouseEventWithHitTestResults.h" #include "Page.h" #include "PlatformKeyboardEvent.h" #include "PlatformScrollBar.h" #include "PlatformWheelEvent.h" #include "RenderWidget.h" #include "SelectionController.h" #include "Settings.h" #include "TextEvent.h" #if ENABLE(SVG) #include "SVGCursorElement.h" #include "SVGDocument.h" #include "SVGLength.h" #include "SVGNames.h" #endif namespace WebCore { using namespace EventNames; using namespace HTMLNames; // The link drag hysteresis is much larger than the others because there // needs to be enough space to cancel the link press without starting a link drag, // and because dragging links is rare. const int LinkDragHysteresis = 40; const int ImageDragHysteresis = 5; const int TextDragHysteresis = 3; const int GeneralDragHysteresis = 3; const double TextDragDelay = 0.15; // Match key code of composition keydown event on windows. // IE sends VK_PROCESSKEY which has value 229; const int CompositionEventKeyCode = 229; #if ENABLE(SVG) using namespace SVGNames; #endif const double autoscrollInterval = 0.1; static Frame* subframeForTargetNode(Node* node); EventHandler::EventHandler(Frame* frame) : m_frame(frame) , m_mousePressed(false) , m_mouseDownMayStartSelect(false) , m_mouseDownMayStartDrag(false) , m_mouseDownWasSingleClickInSelection(false) , m_beganSelectingText(false) , m_hoverTimer(this, &EventHandler::hoverTimerFired) , m_autoscrollTimer(this, &EventHandler::autoscrollTimerFired) , m_autoscrollRenderer(0) , m_mouseDownMayStartAutoscroll(false) , m_mouseDownWasInSubframe(false) #if ENABLE(SVG) , m_svgPan(false) #endif , m_resizeLayer(0) , m_capturingMouseEventsNode(0) , m_clickCount(0) , m_mouseDownTimestamp(0) #if PLATFORM(MAC) , m_mouseDownView(nil) , m_sendingEventToSubview(false) , m_activationEventNumber(0) #endif { } EventHandler::~EventHandler() { } EventHandler::EventHandlerDragState& EventHandler::dragState() { static EventHandlerDragState state; return state; } void EventHandler::clear() { m_hoverTimer.stop(); m_resizeLayer = 0; m_nodeUnderMouse = 0; m_lastNodeUnderMouse = 0; m_lastMouseMoveEventSubframe = 0; m_lastScrollbarUnderMouse = 0; m_clickCount = 0; m_clickNode = 0; m_frameSetBeingResized = 0; m_dragTarget = 0; m_currentMousePosition = IntPoint(); m_mousePressNode = 0; m_mousePressed = false; m_capturingMouseEventsNode = 0; } void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result) { Node* innerNode = result.targetNode(); Selection newSelection; if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect && innerNode->renderer()->shouldSelect()) { VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint())); if (pos.isNotNull()) { newSelection = Selection(pos); newSelection.expandUsingGranularity(WordGranularity); } if (newSelection.isRange()) { m_frame->setSelectionGranularity(WordGranularity); m_beganSelectingText = true; } if (m_frame->shouldChangeSelection(newSelection)) m_frame->selectionController()->setSelection(newSelection); } } bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event) { if (event.event().button() != LeftButton) return false; if (m_frame->selectionController()->isRange()) // A double-click when range is already selected // should not change the selection. So, do not call // selectClosestWordFromMouseEvent, but do set // m_beganSelectingText to prevent handleMouseReleaseEvent // from setting caret selection. m_beganSelectingText = true; else selectClosestWordFromMouseEvent(event); return true; } bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event) { if (event.event().button() != LeftButton) return false; Node* innerNode = event.targetNode(); if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect && innerNode->renderer()->shouldSelect())) return false; Selection newSelection; VisiblePosition pos(innerNode->renderer()->positionForPoint(event.localPoint())); if (pos.isNotNull()) { newSelection = Selection(pos); newSelection.expandUsingGranularity(ParagraphGranularity); } if (newSelection.isRange()) { m_frame->setSelectionGranularity(ParagraphGranularity); m_beganSelectingText = true; } if (m_frame->shouldChangeSelection(newSelection)) m_frame->selectionController()->setSelection(newSelection); return true; } bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event) { if (event.event().button() != LeftButton) return false; Node* innerNode = event.targetNode(); if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect && innerNode->renderer()->shouldSelect())) return false; // Extend the selection if the Shift key is down, unless the click is in a link. bool extendSelection = event.event().shiftKey() && !event.isOverLink(); // Don't restart the selection when the mouse is pressed on an // existing selection so we can allow for text dragging. IntPoint vPoint = m_frame->view()->windowToContents(event.event().pos()); if (!extendSelection && m_frame->selectionController()->contains(vPoint)) { m_mouseDownWasSingleClickInSelection = true; return false; } VisiblePosition visiblePos(innerNode->renderer()->positionForPoint(event.localPoint())); if (visiblePos.isNull()) visiblePos = VisiblePosition(innerNode, innerNode->caretMinOffset(), DOWNSTREAM); Position pos = visiblePos.deepEquivalent(); Selection newSelection = m_frame->selectionController()->selection(); if (extendSelection && newSelection.isCaretOrRange()) { m_frame->selectionController()->setLastChangeWasHorizontalExtension(false); // See REGRESSION (Mail): shift-click deselects when selection // was created right-to-left Position start = newSelection.start(); Position end = newSelection.end(); short before = Range::compareBoundaryPoints(pos.node(), pos.offset(), start.node(), start.offset()); if (before <= 0) newSelection = Selection(pos, end); else newSelection = Selection(start, pos); if (m_frame->selectionGranularity() != CharacterGranularity) newSelection.expandUsingGranularity(m_frame->selectionGranularity()); m_beganSelectingText = true; } else { newSelection = Selection(visiblePos); m_frame->setSelectionGranularity(CharacterGranularity); } if (m_frame->shouldChangeSelection(newSelection)) m_frame->selectionController()->setSelection(newSelection); return true; } bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event) { bool singleClick = event.event().clickCount() <= 1; // If we got the event back, that must mean it wasn't prevented, // so it's allowed to start a drag or selection. m_mouseDownMayStartSelect = canMouseDownStartSelect(event.targetNode()); // Careful that the drag starting logic stays in sync with eventMayStartDrag() m_mouseDownMayStartDrag = singleClick; m_mouseDownWasSingleClickInSelection = false; if (passWidgetMouseDownEventToWidget(event)) return true; #if ENABLE(SVG) if (m_frame->document()->isSVGDocument() && static_cast(m_frame->document())->zoomAndPanEnabled()) { if (event.event().shiftKey() && singleClick) { m_svgPan = true; static_cast(m_frame->document())->startPan(event.event().pos()); return true; } } #endif // We don't do this at the start of mouse down handling, // because we don't want to do it until we know we didn't hit a widget. if (singleClick) focusDocumentView(); Node* innerNode = event.targetNode(); m_mousePressNode = innerNode; m_dragStartPos = event.event().pos(); bool swallowEvent = false; if (event.event().button() == LeftButton || event.event().button() == MiddleButton) { m_frame->selectionController()->setCaretBlinkingSuspended(true); m_mousePressed = true; m_beganSelectingText = false; if (event.event().clickCount() == 2) swallowEvent = handleMousePressEventDoubleClick(event); else if (event.event().clickCount() >= 3) swallowEvent = handleMousePressEventTripleClick(event); else swallowEvent = handleMousePressEventSingleClick(event); } m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect || (m_mousePressNode && m_mousePressNode->renderer() && m_mousePressNode->renderer()->shouldAutoscroll()); return swallowEvent; } bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event) { if (handleDrag(event)) return true; if (!m_mousePressed) return false; Node* targetNode = event.targetNode(); if (event.event().button() != LeftButton || !targetNode || !targetNode->renderer()) return false; #if PLATFORM(MAC) // FIXME: Why does this assertion fire on other platforms? ASSERT(m_mouseDownMayStartSelect || m_mouseDownMayStartAutoscroll); #endif m_mouseDownMayStartDrag = false; if (m_mouseDownMayStartAutoscroll) { // If the selection is contained in a layer that can scroll, that layer should handle the autoscroll // Otherwise, let the bridge handle it so the view can scroll itself. RenderObject* renderer = targetNode->renderer(); while (renderer && !renderer->shouldAutoscroll()) renderer = renderer->parent(); if (renderer) handleAutoscroll(renderer); } updateSelectionForMouseDrag(targetNode, event.localPoint()); return true; } bool EventHandler::eventMayStartDrag(const PlatformMouseEvent& event) const { // This is a pre-flight check of whether the event might lead to a drag being started. Be careful // that its logic needs to stay in sync with handleMouseMoveEvent() and the way we setMouseDownMayStartDrag // in handleMousePressEvent if (!m_frame->renderer() || !m_frame->renderer()->hasLayer() || event.button() != LeftButton || event.clickCount() != 1) return false; bool DHTMLFlag; bool UAFlag; allowDHTMLDrag(DHTMLFlag, UAFlag); if (!DHTMLFlag && !UAFlag) return false; HitTestRequest request(true, false); HitTestResult result(event.pos()); m_frame->renderer()->layer()->hitTest(request, result); bool srcIsDHTML; return result.innerNode() && result.innerNode()->renderer()->draggableNode(DHTMLFlag, UAFlag, event.x(), event.y(), srcIsDHTML); } void EventHandler::updateSelectionForMouseDrag() { FrameView* view = m_frame->view(); if (!view) return; RenderObject* renderer = m_frame->renderer(); if (!renderer) return; RenderLayer* layer = renderer->layer(); if (!layer) return; HitTestResult result(view->windowToContents(m_currentMousePosition)); layer->hitTest(HitTestRequest(true, true, true), result); updateSelectionForMouseDrag(result.innerNode(), result.localPoint()); } void EventHandler::updateSelectionForMouseDrag(Node* targetNode, const IntPoint& localPoint) { if (!m_mouseDownMayStartSelect) return; if (!targetNode) return; RenderObject* targetRenderer = targetNode->renderer(); if (!targetRenderer) return; if (!targetRenderer->shouldSelect()) return; VisiblePosition targetPosition(targetRenderer->positionForPoint(localPoint)); // Don't modify the selection if we're not on a node. if (targetPosition.isNull()) return; // Restart the selection if this is the first mouse move. This work is usually // done in handleMousePressEvent, but not if the mouse press was on an existing selection. Selection newSelection = m_frame->selectionController()->selection(); #if ENABLE(SVG) // Special case to limit selection to the containing block for SVG text. // FIXME: Isn't there a better non-SVG-specific way to do this? if (Node* selectionBaseNode = newSelection.base().node()) if (RenderObject* selectionBaseRenderer = selectionBaseNode->renderer()) if (selectionBaseRenderer->isSVGText()) if (targetNode->renderer()->containingBlock() != selectionBaseRenderer->containingBlock()) return; #endif if (!m_beganSelectingText) { m_beganSelectingText = true; newSelection = Selection(targetPosition); } newSelection.setExtent(targetPosition); if (m_frame->selectionGranularity() != CharacterGranularity) newSelection.expandUsingGranularity(m_frame->selectionGranularity()); if (m_frame->shouldChangeSelection(newSelection)) { m_frame->selectionController()->setLastChangeWasHorizontalExtension(false); m_frame->selectionController()->setSelection(newSelection); } } bool EventHandler::handleMouseUp(const MouseEventWithHitTestResults& event) { if (eventLoopHandleMouseUp(event)) return true; // If this was the first click in the window, we don't even want to clear the selection. // This case occurs when the user clicks on a draggable element, since we have to process // the mouse down and drag events to see if we might start a drag. For other first clicks // in a window, we just don't acceptFirstMouse, and the whole down-drag-up sequence gets // ignored upstream of this layer. return eventActivatedView(event.event()); } bool EventHandler::handleMouseReleaseEvent(const MouseEventWithHitTestResults& event) { stopAutoscrollTimer(); if (handleMouseUp(event)) return true; // Used to prevent mouseMoveEvent from initiating a drag before // the mouse is pressed again. m_frame->selectionController()->setCaretBlinkingSuspended(false); m_mousePressed = false; m_mouseDownMayStartDrag = false; m_mouseDownMayStartSelect = false; m_mouseDownMayStartAutoscroll = false; m_mouseDownWasInSubframe = false; bool handled = false; // Clear the selection if the mouse didn't move after the last mouse press. // We do this so when clicking on the selection, the selection goes away. // However, if we are editing, place the caret. if (m_mouseDownWasSingleClickInSelection && !m_beganSelectingText && m_dragStartPos == event.event().pos() && m_frame->selectionController()->isRange()) { Selection newSelection; Node *node = event.targetNode(); if (node && node->isContentEditable() && node->renderer()) { VisiblePosition pos = node->renderer()->positionForPoint(event.localPoint()); newSelection = Selection(pos); } if (m_frame->shouldChangeSelection(newSelection)) m_frame->selectionController()->setSelection(newSelection); handled = true; } m_frame->notifyRendererOfSelectionChange(true); m_frame->selectionController()->selectFrameElementInParentIfFullySelected(); return handled; } void EventHandler::handleAutoscroll(RenderObject* renderer) { if (m_autoscrollTimer.isActive()) return; setAutoscrollRenderer(renderer); startAutoscrollTimer(); } void EventHandler::autoscrollTimerFired(Timer*) { if (!m_mousePressed) { stopAutoscrollTimer(); return; } if (RenderObject* r = autoscrollRenderer()) r->autoscroll(); } RenderObject* EventHandler::autoscrollRenderer() const { return m_autoscrollRenderer; } void EventHandler::setAutoscrollRenderer(RenderObject* renderer) { m_autoscrollRenderer = renderer; } void EventHandler::allowDHTMLDrag(bool& flagDHTML, bool& flagUA) const { if (!m_frame || !m_frame->document()) { flagDHTML = false; flagUA = false; } unsigned mask = m_frame->page()->dragController()->delegateDragSourceAction(m_frame->view()->contentsToWindow(m_mouseDownPos)); flagDHTML = (mask & DragSourceActionDHTML) != DragSourceActionNone; flagUA = ((mask & DragSourceActionImage) || (mask & DragSourceActionLink) || (mask & DragSourceActionSelection)); } HitTestResult EventHandler::hitTestResultAtPoint(const IntPoint& point, bool allowShadowContent) { HitTestResult result(point); if (!m_frame->renderer()) return result; m_frame->renderer()->layer()->hitTest(HitTestRequest(true, true), result); IntPoint widgetPoint(point); while (true) { Node* n = result.innerNode(); if (!n || !n->renderer() || !n->renderer()->isWidget()) break; Widget* widget = static_cast(n->renderer())->widget(); if (!widget || !widget->isFrameView()) break; Frame* frame = static_cast(n)->contentFrame(); if (!frame || !frame->renderer()) break; int absX, absY; n->renderer()->absolutePosition(absX, absY, true); FrameView* view = static_cast(widget); widgetPoint.move(view->contentsX() - absX, view->contentsY() - absY); HitTestResult widgetHitTestResult(widgetPoint); frame->renderer()->layer()->hitTest(HitTestRequest(true, true), widgetHitTestResult); result = widgetHitTestResult; } if (!allowShadowContent) result.setToNonShadowAncestor(); return result; } void EventHandler::startAutoscrollTimer() { m_autoscrollTimer.startRepeating(autoscrollInterval); } void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed) { if (m_mouseDownWasInSubframe) { if (Frame* subframe = subframeForTargetNode(m_mousePressNode.get())) subframe->eventHandler()->stopAutoscrollTimer(rendererIsBeingDestroyed); return; } if (!rendererIsBeingDestroyed && autoscrollRenderer()) autoscrollRenderer()->stopAutoscroll(); setAutoscrollRenderer(0); m_autoscrollTimer.stop(); } Node* EventHandler::mousePressNode() const { return m_mousePressNode.get(); } void EventHandler::setMousePressNode(PassRefPtr node) { m_mousePressNode = node; } bool EventHandler::scrollOverflow(ScrollDirection direction, ScrollGranularity granularity) { if (!m_frame->document()) return false; Node* node = m_frame->document()->focusedNode(); if (!node) node = m_mousePressNode.get(); if (node) { RenderObject *r = node->renderer(); if (r && !r->isListBox()) return r->scroll(direction, granularity); } return false; } IntPoint EventHandler::currentMousePosition() const { return m_currentMousePosition; } Frame* subframeForTargetNode(Node* node) { if (!node) return 0; RenderObject* renderer = node->renderer(); if (!renderer || !renderer->isWidget()) return 0; Widget* widget = static_cast(renderer)->widget(); if (!widget || !widget->isFrameView()) return 0; return static_cast(widget)->frame(); } static bool isSubmitImage(Node* node) { return node && node->hasTagName(inputTag) && static_cast(node)->inputType() == HTMLInputElement::IMAGE; } // Returns true if the node's editable block is not current focused for editing static bool nodeIsNotBeingEdited(Node* node, Frame* frame) { return frame->selectionController()->rootEditableElement() != node->rootEditableElement(); } Cursor EventHandler::selectCursor(const MouseEventWithHitTestResults& event, PlatformScrollbar* scrollbar) { // During selection, use an I-beam no matter what we're over. // If you're capturing mouse events for a particular node, don't treat this as a selection. if (m_mousePressed && m_mouseDownMayStartSelect && m_frame->selectionController()->isCaretOrRange() && !m_capturingMouseEventsNode) return iBeamCursor(); Node* node = event.targetNode(); RenderObject* renderer = node ? node->renderer() : 0; RenderStyle* style = renderer ? renderer->style() : 0; if (style && style->cursors()) { const CursorList* cursors = style->cursors(); for (unsigned i = 0; i < cursors->size(); ++i) { CachedImage* cimage = (*cursors)[i].cursorImage; IntPoint hotSpot = (*cursors)[i].hotSpot; #if ENABLE(SVG) if (!cimage) { Element* e = node->document()->getElementById((*cursors)[i].cursorFragmentId); if (e && e->hasTagName(cursorTag)) { hotSpot.setX(int(static_cast(e)->x().value())); hotSpot.setY(int(static_cast(e)->y().value())); cimage = static_cast(e)->cachedImage(); } } #endif if (!cimage) continue; if (cimage->image()->isNull()) break; if (!cimage->errorOccurred()) return Cursor(cimage->image(), hotSpot); } } switch (style ? style->cursor() : CURSOR_AUTO) { case CURSOR_AUTO: { bool editable = (node && node->isContentEditable()); bool editableLinkEnabled = false; // If the link is editable, then we need to check the settings to see whether or not the link should be followed if (editable) { ASSERT(m_frame->settings()); switch(m_frame->settings()->editableLinkBehavior()) { default: case EditableLinkDefaultBehavior: case EditableLinkAlwaysLive: editableLinkEnabled = true; break; case EditableLinkNeverLive: editableLinkEnabled = false; break; case EditableLinkLiveWhenNotFocused: editableLinkEnabled = nodeIsNotBeingEdited(node, m_frame) || event.event().shiftKey(); break; case EditableLinkOnlyLiveWithShiftKey: editableLinkEnabled = event.event().shiftKey(); break; } } if ((event.isOverLink() || isSubmitImage(node)) && (!editable || editableLinkEnabled)) return handCursor(); RenderLayer* layer = renderer ? renderer->enclosingLayer() : 0; bool inResizer = false; if (m_frame->view() && layer && layer->isPointInResizeControl(m_frame->view()->windowToContents(event.event().pos()))) inResizer = true; if ((editable || (renderer && renderer->isText() && renderer->canSelect())) && !inResizer && !scrollbar) return iBeamCursor(); return pointerCursor(); } case CURSOR_CROSS: return crossCursor(); case CURSOR_POINTER: return handCursor(); case CURSOR_MOVE: return moveCursor(); case CURSOR_ALL_SCROLL: return moveCursor(); case CURSOR_E_RESIZE: return eastResizeCursor(); case CURSOR_W_RESIZE: return westResizeCursor(); case CURSOR_N_RESIZE: return northResizeCursor(); case CURSOR_S_RESIZE: return southResizeCursor(); case CURSOR_NE_RESIZE: return northEastResizeCursor(); case CURSOR_SW_RESIZE: return southWestResizeCursor(); case CURSOR_NW_RESIZE: return northWestResizeCursor(); case CURSOR_SE_RESIZE: return southEastResizeCursor(); case CURSOR_NS_RESIZE: return northSouthResizeCursor(); case CURSOR_EW_RESIZE: return eastWestResizeCursor(); case CURSOR_NESW_RESIZE: return northEastSouthWestResizeCursor(); case CURSOR_NWSE_RESIZE: return northWestSouthEastResizeCursor(); case CURSOR_COL_RESIZE: return columnResizeCursor(); case CURSOR_ROW_RESIZE: return rowResizeCursor(); case CURSOR_TEXT: return iBeamCursor(); case CURSOR_WAIT: return waitCursor(); case CURSOR_HELP: return helpCursor(); case CURSOR_VERTICAL_TEXT: return verticalTextCursor(); case CURSOR_CELL: return cellCursor(); case CURSOR_CONTEXT_MENU: return contextMenuCursor(); case CURSOR_PROGRESS: return progressCursor(); case CURSOR_NO_DROP: return noDropCursor(); case CURSOR_ALIAS: return aliasCursor(); case CURSOR_COPY: return copyCursor(); case CURSOR_NONE: return noneCursor(); case CURSOR_NOT_ALLOWED: return notAllowedCursor(); case CURSOR_DEFAULT: return pointerCursor(); case CURSOR_WEBKIT_ZOOM_IN: return zoomInCursor(); case CURSOR_WEBKIT_ZOOM_OUT: return zoomOutCursor(); } return pointerCursor(); } bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent) { if (!m_frame->document()) return false; RefPtr protector(m_frame->view()); m_mousePressed = true; m_currentMousePosition = mouseEvent.pos(); m_mouseDownTimestamp = mouseEvent.timestamp(); m_mouseDownMayStartDrag = false; m_mouseDownMayStartSelect = false; m_mouseDownMayStartAutoscroll = false; m_mouseDownPos = m_frame->view()->windowToContents(mouseEvent.pos()); m_mouseDownWasInSubframe = false; MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, true), mouseEvent); if (!mev.targetNode()) { invalidateClick(); return false; } m_mousePressNode = mev.targetNode(); Frame* subframe = subframeForTargetNode(mev.targetNode()); if (subframe && passMousePressEventToSubframe(mev, subframe)) { // Start capturing future events for this frame. We only do this if we didn't clear // the m_mousePressed flag, which may happen if an AppKit widget entered a modal event loop. if (m_mousePressed) m_capturingMouseEventsNode = mev.targetNode(); invalidateClick(); return true; } m_clickCount = mouseEvent.clickCount(); m_clickNode = mev.targetNode(); RenderLayer* layer = m_clickNode->renderer() ? m_clickNode->renderer()->enclosingLayer() : 0; IntPoint p = m_frame->view()->windowToContents(mouseEvent.pos()); if (layer && layer->isPointInResizeControl(p)) { layer->setInResizeMode(true); m_resizeLayer = layer; m_offsetFromResizeCorner = layer->offsetFromResizeCorner(p); invalidateClick(); return true; } bool swallowEvent = dispatchMouseEvent(mousedownEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true); // If the hit testing originally determined the event was in a scrollbar, refetch the MouseEventWithHitTestResults // in case the scrollbar widget was destroyed when the mouse event was handled. if (mev.scrollbar()) mev = prepareMouseEvent(HitTestRequest(true, true), mouseEvent); if (swallowEvent) { // scrollbars should get events anyway, even disabled controls might be scrollable if (mev.scrollbar()) passMousePressEventToScrollbar(mev, mev.scrollbar()); } else { // Refetch the event target node if it currently is the shadow node inside an element. // If a mouse event handler changes the input element type to one that has a widget associated, // we'd like to EventHandler::handleMousePressEvent to pass the event to the widget and thus the // event target node can't still be the shadow node. if (mev.targetNode()->isShadowNode() && mev.targetNode()->shadowParentNode()->hasTagName(inputTag)) mev = prepareMouseEvent(HitTestRequest(true, true), mouseEvent); PlatformScrollbar* scrollbar = m_frame->view()->scrollbarUnderMouse(mouseEvent); if (!scrollbar) scrollbar = mev.scrollbar(); if (scrollbar && passMousePressEventToScrollbar(mev, scrollbar)) swallowEvent = true; else swallowEvent = handleMousePressEvent(mev); } return swallowEvent; } // This method only exists for platforms that don't know how to deliver bool EventHandler::handleMouseDoubleClickEvent(const PlatformMouseEvent& mouseEvent) { if (!m_frame->document()) return false; RefPtr protector(m_frame->view()); // We get this instead of a second mouse-up m_mousePressed = false; m_currentMousePosition = mouseEvent.pos(); MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, true), mouseEvent); Frame* subframe = subframeForTargetNode(mev.targetNode()); if (subframe && passMousePressEventToSubframe(mev, subframe)) { m_capturingMouseEventsNode = 0; return true; } m_clickCount = mouseEvent.clickCount(); bool swallowMouseUpEvent = dispatchMouseEvent(mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false); bool swallowClickEvent = false; // Don't ever dispatch click events for right clicks if (mouseEvent.button() != RightButton && mev.targetNode() == m_clickNode) swallowClickEvent = dispatchMouseEvent(clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true); bool swallowMouseReleaseEvent = false; if (!swallowMouseUpEvent) swallowMouseReleaseEvent = handleMouseReleaseEvent(mev); invalidateClick(); return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent; } bool EventHandler::mouseMoved(const PlatformMouseEvent& event) { HitTestResult hoveredNode = HitTestResult(IntPoint()); bool result = handleMouseMoveEvent(event, &hoveredNode); Page* page = m_frame->page(); if (!page) return result; hoveredNode.setToNonShadowAncestor(); page->chrome()->mouseDidMoveOverElement(hoveredNode, event.modifierFlags()); page->chrome()->setToolTip(hoveredNode); return result; } bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& mouseEvent, HitTestResult* hoveredNode) { // in Radar 3703768 we saw frequent crashes apparently due to the // part being null here, which seems impossible, so check for nil // but also assert so that we can try to figure this out in debug // builds, if it happens. ASSERT(m_frame); if (!m_frame || !m_frame->document()) return false; RefPtr protector(m_frame->view()); m_currentMousePosition = mouseEvent.pos(); if (m_hoverTimer.isActive()) m_hoverTimer.stop(); #if ENABLE(SVG) if (m_svgPan) { static_cast(m_frame->document())->updatePan(m_currentMousePosition); return true; } #endif if (m_frameSetBeingResized) return dispatchMouseEvent(mousemoveEvent, m_frameSetBeingResized.get(), false, 0, mouseEvent, false); // Send events right to a scrollbar if the mouse is pressed. if (m_lastScrollbarUnderMouse && m_mousePressed) return m_lastScrollbarUnderMouse->handleMouseMoveEvent(mouseEvent); // Treat mouse move events while the mouse is pressed as "read-only" in prepareMouseEvent // if we are allowed to select. // This means that :hover and :active freeze in the state they were in when the mouse // was pressed, rather than updating for nodes the mouse moves over as you hold the mouse down. HitTestRequest request(m_mousePressed && m_mouseDownMayStartSelect, m_mousePressed, true); MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent); if (hoveredNode) *hoveredNode = mev.hitTestResult(); PlatformScrollbar* scrollbar = 0; if (m_resizeLayer && m_resizeLayer->inResizeMode()) m_resizeLayer->resize(mouseEvent, m_offsetFromResizeCorner); else { if (m_frame->view()) scrollbar = m_frame->view()->scrollbarUnderMouse(mouseEvent); if (!scrollbar) scrollbar = mev.scrollbar(); if (m_lastScrollbarUnderMouse != scrollbar) { // Send mouse exited to the old scrollbar. if (m_lastScrollbarUnderMouse) m_lastScrollbarUnderMouse->handleMouseOutEvent(mouseEvent); m_lastScrollbarUnderMouse = scrollbar; } } bool swallowEvent = false; Node* targetNode = m_capturingMouseEventsNode ? m_capturingMouseEventsNode.get() : mev.targetNode(); RefPtr newSubframe = subframeForTargetNode(targetNode); // We want mouseouts to happen first, from the inside out. First send a move event to the last subframe so that it will fire mouseouts. if (m_lastMouseMoveEventSubframe && m_lastMouseMoveEventSubframe->tree()->isDescendantOf(m_frame) && m_lastMouseMoveEventSubframe != newSubframe) passMouseMoveEventToSubframe(mev, m_lastMouseMoveEventSubframe.get()); if (newSubframe) { // Update over/out state before passing the event to the subframe. updateMouseEventTargetNode(mev.targetNode(), mouseEvent, true); swallowEvent |= passMouseMoveEventToSubframe(mev, newSubframe.get(), hoveredNode); } else { if (scrollbar && !m_mousePressed) scrollbar->handleMouseMoveEvent(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering. if ((!m_resizeLayer || !m_resizeLayer->inResizeMode()) && m_frame->view()) m_frame->view()->setCursor(selectCursor(mev, scrollbar)); } m_lastMouseMoveEventSubframe = newSubframe; if (swallowEvent) return true; swallowEvent = dispatchMouseEvent(mousemoveEvent, mev.targetNode(), false, 0, mouseEvent, true); if (!swallowEvent) swallowEvent = handleMouseDraggedEvent(mev); return swallowEvent; } void EventHandler::invalidateClick() { m_clickCount = 0; m_clickNode = 0; } bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent) { if (!m_frame->document()) return false; RefPtr protector(m_frame->view()); m_mousePressed = false; m_currentMousePosition = mouseEvent.pos(); #if ENABLE(SVG) if (m_svgPan) { m_svgPan = false; return true; } #endif if (m_frameSetBeingResized) return dispatchMouseEvent(mouseupEvent, m_frameSetBeingResized.get(), true, m_clickCount, mouseEvent, false); if (m_lastScrollbarUnderMouse) { invalidateClick(); return m_lastScrollbarUnderMouse->handleMouseReleaseEvent(mouseEvent); } MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(false, false, false, true), mouseEvent); Node* targetNode = m_capturingMouseEventsNode.get() ? m_capturingMouseEventsNode.get() : mev.targetNode(); Frame* subframe = subframeForTargetNode(targetNode); if (subframe && passMouseReleaseEventToSubframe(mev, subframe)) { m_capturingMouseEventsNode = 0; return true; } bool swallowMouseUpEvent = dispatchMouseEvent(mouseupEvent, mev.targetNode(), true, m_clickCount, mouseEvent, false); // Don't ever dispatch click events for right clicks bool swallowClickEvent = false; if (m_clickCount > 0 && mouseEvent.button() != RightButton && mev.targetNode() == m_clickNode) swallowClickEvent = dispatchMouseEvent(clickEvent, mev.targetNode(), true, m_clickCount, mouseEvent, true); if (m_resizeLayer) { m_resizeLayer->setInResizeMode(false); m_resizeLayer = 0; } bool swallowMouseReleaseEvent = false; if (!swallowMouseUpEvent) swallowMouseReleaseEvent = handleMouseReleaseEvent(mev); invalidateClick(); return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent; } bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTarget, const PlatformMouseEvent& event, Clipboard* clipboard) { IntPoint contentsPos = m_frame->view()->windowToContents(event.pos()); RefPtr me = new MouseEvent(eventType, true, true, m_frame->document()->defaultView(), 0, event.globalX(), event.globalY(), contentsPos.x(), contentsPos.y(), event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), 0, 0, clipboard); ExceptionCode ec = 0; EventTargetNodeCast(dragTarget)->dispatchEvent(me.get(), ec, true); return me->defaultPrevented(); } bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard) { bool accept = false; if (!m_frame->document()) return false; if (!m_frame->view()) return false; MouseEventWithHitTestResults mev = prepareMouseEvent(HitTestRequest(true, false), event); // Drag events should never go to text nodes (following IE, and proper mouseover/out dispatch) Node* newTarget = mev.targetNode(); if (newTarget && newTarget->isTextNode()) newTarget = newTarget->parentNode(); if (newTarget) newTarget = newTarget->shadowAncestorNode(); if (m_dragTarget != newTarget) { // FIXME: this ordering was explicitly chosen to match WinIE. However, // it is sometimes incorrect when dragging within subframes, as seen with // LayoutTests/fast/events/drag-in-frames.html. if (newTarget) if (newTarget->hasTagName(frameTag) || newTarget->hasTagName(iframeTag)) accept = static_cast(newTarget)->contentFrame()->eventHandler()->updateDragAndDrop(event, clipboard); else accept = dispatchDragEvent(dragenterEvent, newTarget, event, clipboard); if (m_dragTarget) { Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag)) ? static_cast(m_dragTarget.get())->contentFrame() : 0; if (frame) accept = frame->eventHandler()->updateDragAndDrop(event, clipboard); else dispatchDragEvent(dragleaveEvent, m_dragTarget.get(), event, clipboard); } } else { if (newTarget) if (newTarget->hasTagName(frameTag) || newTarget->hasTagName(iframeTag)) accept = static_cast(newTarget)->contentFrame()->eventHandler()->updateDragAndDrop(event, clipboard); else accept = dispatchDragEvent(dragoverEvent, newTarget, event, clipboard); } m_dragTarget = newTarget; return accept; } void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard) { if (m_dragTarget) { Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag)) ? static_cast(m_dragTarget.get())->contentFrame() : 0; if (frame) frame->eventHandler()->cancelDragAndDrop(event, clipboard); else dispatchDragEvent(dragleaveEvent, m_dragTarget.get(), event, clipboard); } m_dragTarget = 0; } bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard) { bool accept = false; if (m_dragTarget) { Frame* frame = (m_dragTarget->hasTagName(frameTag) || m_dragTarget->hasTagName(iframeTag)) ? static_cast(m_dragTarget.get())->contentFrame() : 0; if (frame) accept = frame->eventHandler()->performDragAndDrop(event, clipboard); else accept = dispatchDragEvent(dropEvent, m_dragTarget.get(), event, clipboard); } m_dragTarget = 0; return accept; } Node* EventHandler::nodeUnderMouse() const { return m_nodeUnderMouse.get(); } void EventHandler::setCapturingMouseEventsNode(PassRefPtr n) { m_capturingMouseEventsNode = n; } MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev) { ASSERT(m_frame); ASSERT(m_frame->document()); IntPoint documentPoint = m_frame->view()->windowToContents(mev.pos()); return m_frame->document()->prepareMouseEvent(request, documentPoint, mev); } void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& mouseEvent, bool fireMouseOverOut) { Node* result = targetNode; // If we're capturing, we always go right to that node. if (m_capturingMouseEventsNode) result = m_capturingMouseEventsNode.get(); // If the target node is a text node, dispatch on the parent node - rdar://4196646 if (result && result->isTextNode()) result = result->parentNode(); if (result) result = result->shadowAncestorNode(); m_nodeUnderMouse = result; // Fire mouseout/mouseover if the mouse has shifted to a different node. if (fireMouseOverOut) { if (m_lastNodeUnderMouse && m_lastNodeUnderMouse->document() != m_frame->document()) { m_lastNodeUnderMouse = 0; m_lastScrollbarUnderMouse = 0; } if (m_lastNodeUnderMouse != m_nodeUnderMouse) { // send mouseout event to the old node if (m_lastNodeUnderMouse) EventTargetNodeCast(m_lastNodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, mouseoutEvent, 0, m_nodeUnderMouse.get()); // send mouseover event to the new node if (m_nodeUnderMouse) EventTargetNodeCast(m_nodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, mouseoverEvent, 0, m_lastNodeUnderMouse.get()); } m_lastNodeUnderMouse = m_nodeUnderMouse; } } bool EventHandler::dispatchMouseEvent(const AtomicString& eventType, Node* targetNode, bool cancelable, int clickCount, const PlatformMouseEvent& mouseEvent, bool setUnder) { updateMouseEventTargetNode(targetNode, mouseEvent, setUnder); bool swallowEvent = false; if (m_nodeUnderMouse) swallowEvent = EventTargetNodeCast(m_nodeUnderMouse.get())->dispatchMouseEvent(mouseEvent, eventType, clickCount); if (!swallowEvent && eventType == mousedownEvent) { // Blur current focus node when a link/button is clicked; this // is expected by some sites that rely on onChange handlers running // from form fields before the button click is processed. Node* node = m_nodeUnderMouse.get(); RenderObject* renderer = node ? node->renderer() : 0; // Walk up the render tree to search for a node to focus. // Walking up the DOM tree wouldn't work for shadow trees, like those behind the engine-based text fields. while (renderer) { node = renderer->element(); if (node && node->isFocusable()) { // To fix Can't drag selected ToDo, we don't focus a // node on mouse down if it's selected and inside a focused node. It will be // focused if the user does a mouseup over it, however, because the mouseup // will set a selection inside it, which will call setFocuseNodeIfNeeded. ExceptionCode ec = 0; Node* n = node->isShadowNode() ? node->shadowParentNode() : node; if (m_frame->selectionController()->isRange() && m_frame->selectionController()->toRange()->compareNode(n, ec) == Range::NODE_INSIDE && n->isDescendantOf(m_frame->document()->focusedNode())) return false; break; } renderer = renderer->parent(); } // If focus shift is blocked, we eat the event. Note we should never clear swallowEvent // if the page already set it (e.g., by canceling default behavior). if (node && node->isMouseFocusable()) { if (!m_frame->page()->focusController()->setFocusedNode(node, m_frame)) swallowEvent = true; } else if (!node || !node->focused()) { if (!m_frame->page()->focusController()->setFocusedNode(0, m_frame)) swallowEvent = true; } } return swallowEvent; } bool EventHandler::handleWheelEvent(PlatformWheelEvent& e) { Document* doc = m_frame->document(); if (!doc) return false; RenderObject* docRenderer = doc->renderer(); if (!docRenderer) return false; IntPoint vPoint = m_frame->view()->windowToContents(e.pos()); HitTestRequest request(true, false); HitTestResult result(vPoint); doc->renderer()->layer()->hitTest(request, result); Node* node = result.innerNode(); if (node) { // Figure out which view to send the event to. RenderObject* target = node->renderer(); if (target && target->isWidget() && passWheelEventToWidget(e, static_cast(target)->widget())) { e.accept(); return true; } node = node->shadowAncestorNode(); EventTargetNodeCast(node)->dispatchWheelEvent(e); if (e.isAccepted()) return true; if (node->renderer()) { // Just break up into two scrolls if we need to. Diagonal movement on // a MacBook pro is an example of a 2-dimensional mouse wheel event (where both deltaX and deltaY can be set). float deltaX = e.isContinuous() ? e.continuousDeltaX() : e.deltaX(); float deltaY = e.isContinuous() ? e.continuousDeltaY() : e.deltaY(); if (deltaX && node->renderer()->scroll(deltaX < 0 ? ScrollRight : ScrollLeft, e.isContinuous() ? ScrollByPixel : ScrollByLine, deltaX < 0 ? -deltaX : deltaX)) e.accept(); if (deltaY && node->renderer()->scroll(deltaY < 0 ? ScrollDown : ScrollUp, e.isContinuous() ? ScrollByPixel : ScrollByLine, deltaY < 0 ? -deltaY : deltaY)) e.accept(); } } if (!e.isAccepted()) m_frame->view()->wheelEvent(e); return e.isAccepted(); } bool EventHandler::sendContextMenuEvent(const PlatformMouseEvent& event) { Document* doc = m_frame->document(); FrameView* v = m_frame->view(); if (!doc || !v) return false; bool swallowEvent; IntPoint viewportPos = v->windowToContents(event.pos()); MouseEventWithHitTestResults mev = doc->prepareMouseEvent(HitTestRequest(false, true), viewportPos, event); if (!m_frame->selectionController()->contains(viewportPos) && // FIXME: In the editable case, word selection sometimes selects content that isn't underneath the mouse. // If the selection is non-editable, we do word selection to make it easier to use the contextual menu items // available for text selections. But only if we're above text. (m_frame->selectionController()->isContentEditable() || mev.targetNode() && mev.targetNode()->isTextNode())) { m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection selectClosestWordFromMouseEvent(mev); } swallowEvent = dispatchMouseEvent(contextmenuEvent, mev.targetNode(), true, 0, event, true); return swallowEvent; } void EventHandler::scheduleHoverStateUpdate() { if (!m_hoverTimer.isActive()) m_hoverTimer.startOneShot(0); } bool EventHandler::canMouseDownStartSelect(Node* node) { if (!node || !node->renderer()) return true; // Check to see if -webkit-user-select has been set to none if (!node->renderer()->canSelect()) return false; // Some controls and images can't start a select on a mouse down. for (RenderObject* curr = node->renderer(); curr; curr = curr->parent()) if (curr->style()->userSelect() == SELECT_IGNORE) return false; return true; } void EventHandler::setResizingFrameSet(HTMLFrameSetElement* frameSet) { m_frameSetBeingResized = frameSet; } void EventHandler::hoverTimerFired(Timer*) { m_hoverTimer.stop(); ASSERT(m_frame); ASSERT(m_frame->document()); if (RenderObject* renderer = m_frame->renderer()) { HitTestResult result(m_frame->view()->windowToContents(m_currentMousePosition)); renderer->layer()->hitTest(HitTestRequest(false, false, true), result); m_frame->document()->updateRendering(); } } static EventTargetNode* eventTargetNodeForDocument(Document* doc) { if (!doc) return 0; Node* node = doc->focusedNode(); if (!node) { if (doc->isHTMLDocument()) node = doc->body(); else node = doc->documentElement(); if (!node) return 0; } return EventTargetNodeCast(node); } bool EventHandler::keyEvent(const PlatformKeyboardEvent& initialKeyEvent) { // Check for cases where we are too early for events -- possible unmatched key up // from pressing return in the location bar. EventTargetNode* node = eventTargetNodeForDocument(m_frame->document()); if (!node) return false; if (initialKeyEvent.isKeyUp()) return !node->dispatchKeyEvent(initialKeyEvent); m_frame->loader()->resetMultipleFormSubmissionProtection(); // Prepare the keyPress in advance of the keyDown so we can fire the input method // in advance of keyDown PlatformKeyboardEvent keyPressEvent = initialKeyEvent; keyPressEvent.setIsAutoRepeat(true); RefPtr keypress = new KeyboardEvent(keyPressEvent, m_frame->document()->defaultView()); keypress->setTarget(node); // Run input method in advance of DOM event handling. This may result in the IM // modifying the page prior the keydown event, however this behaviour is necessary // in order to match IE m_frame->editor()->handleInputMethodKeypress(keypress.get()); bool handledByInputMethod = keypress->defaultHandled(); PlatformKeyboardEvent keyDownEvent = initialKeyEvent; if (handledByInputMethod) keyDownEvent.setWindowsKeyCode(CompositionEventKeyCode); // We always send keyDown and keyPress for all events, including autorepeat keys keyDownEvent.setIsAutoRepeat(false); bool result = !node->dispatchKeyEvent(keyDownEvent); // Focus may have change during the keyDown handling, so refetch node node = eventTargetNodeForDocument(m_frame->document()); if (!node) return result; if (keypress->defaultHandled()) return true; if (handledByInputMethod) return result; // If the default handling has been prevented on the keydown, we prevent it on // the keypress as well if (result) keypress->setDefaultHandled(); ExceptionCode ec; node->dispatchEvent(keypress, ec, true); return result || keypress->defaultHandled() || keypress->defaultPrevented(); } void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event) { if (event->type() == keypressEvent) { m_frame->editor()->handleKeypress(event); if (event->defaultHandled()) return; if (event->keyIdentifier() == "U+0009") defaultTabEventHandler(event, false); } } bool EventHandler::dragHysteresisExceeded(const FloatPoint& floatDragViewportLocation) const { IntPoint dragViewportLocation((int)floatDragViewportLocation.x(), (int)floatDragViewportLocation.y()); return dragHysteresisExceeded(dragViewportLocation); } bool EventHandler::dragHysteresisExceeded(const IntPoint& dragViewportLocation) const { IntPoint dragLocation = m_frame->view()->windowToContents(dragViewportLocation); IntSize delta = dragLocation - m_mouseDownPos; int threshold = GeneralDragHysteresis; if (dragState().m_dragSrcIsImage) threshold = ImageDragHysteresis; else if (dragState().m_dragSrcIsLink) threshold = LinkDragHysteresis; else if (dragState().m_dragSrcInSelection) threshold = TextDragHysteresis; return abs(delta.width()) >= threshold || abs(delta.height()) >= threshold; } void EventHandler::freeClipboard() { if (dragState().m_dragClipboard) dragState().m_dragClipboard->setAccessPolicy(ClipboardNumb); } bool EventHandler::shouldDragAutoNode(Node* node, const IntPoint& point) const { ASSERT(node); if (node->hasChildNodes() || !m_frame->view()) return false; return m_frame->page() && m_frame->page()->dragController()->mayStartDragAtEventLocation(m_frame, point); } void EventHandler::dragSourceMovedTo(const PlatformMouseEvent& event) { if (dragState().m_dragSrc && dragState().m_dragSrcMayBeDHTML) // for now we don't care if event handler cancels default behavior, since there is none dispatchDragSrcEvent(dragEvent, event); } void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event, DragOperation operation) { if (dragState().m_dragSrc && dragState().m_dragSrcMayBeDHTML) { dragState().m_dragClipboard->setDestinationOperation(operation); // for now we don't care if event handler cancels default behavior, since there is none dispatchDragSrcEvent(dragendEvent, event); } freeClipboard(); dragState().m_dragSrc = 0; } // returns if we should continue "default processing", i.e., whether eventhandler canceled bool EventHandler::dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent& event) { return !dispatchDragEvent(eventType, dragState().m_dragSrc.get(), event, dragState().m_dragClipboard.get()); } bool EventHandler::handleDrag(const MouseEventWithHitTestResults& event) { if (event.event().button() != LeftButton || event.event().eventType() != MouseEventMoved) { // If we allowed the other side of the bridge to handle a drag // last time, then m_mousePressed might still be set. So we // clear it now to make sure the next move after a drag // doesn't look like a drag. m_mousePressed = false; return false; } if (eventLoopHandleMouseDragged(event)) return true; // Careful that the drag starting logic stays in sync with eventMayStartDrag() if (m_mouseDownMayStartDrag && !dragState().m_dragSrc) { allowDHTMLDrag(dragState().m_dragSrcMayBeDHTML, dragState().m_dragSrcMayBeUA); if (!dragState().m_dragSrcMayBeDHTML && !dragState().m_dragSrcMayBeUA) m_mouseDownMayStartDrag = false; // no element is draggable } if (m_mouseDownMayStartDrag && !dragState().m_dragSrc) { // try to find an element that wants to be dragged HitTestRequest request(true, false); HitTestResult result(m_mouseDownPos); m_frame->renderer()->layer()->hitTest(request, result); Node* node = result.innerNode(); if (node && node->renderer()) dragState().m_dragSrc = node->renderer()->draggableNode(dragState().m_dragSrcMayBeDHTML, dragState().m_dragSrcMayBeUA, m_mouseDownPos.x(), m_mouseDownPos.y(), dragState().m_dragSrcIsDHTML); else dragState().m_dragSrc = 0; if (!dragState().m_dragSrc) m_mouseDownMayStartDrag = false; // no element is draggable else { // remember some facts about this source, while we have a HitTestResult handy node = result.URLElement(); dragState().m_dragSrcIsLink = node && node->isLink(); node = result.innerNonSharedNode(); dragState().m_dragSrcIsImage = node && node->renderer() && node->renderer()->isImage(); dragState().m_dragSrcInSelection = m_frame->selectionController()->contains(m_mouseDownPos); } } // For drags starting in the selection, the user must wait between the mousedown and mousedrag, // or else we bail on the dragging stuff and allow selection to occur if (m_mouseDownMayStartDrag && !dragState().m_dragSrcIsImage && dragState().m_dragSrcInSelection && event.event().timestamp() - m_mouseDownTimestamp < TextDragDelay) { m_mouseDownMayStartDrag = false; dragState().m_dragSrc = 0; // ...but if this was the first click in the window, we don't even want to start selection if (eventActivatedView(event.event())) m_mouseDownMayStartSelect = false; } if (!m_mouseDownMayStartDrag) return !mouseDownMayStartSelect() && !m_mouseDownMayStartAutoscroll; // We are starting a text/image/url drag, so the cursor should be an arrow m_frame->view()->setCursor(pointerCursor()); if (!dragHysteresisExceeded(event.event().pos())) return true; // Once we're past the hysteresis point, we don't want to treat this gesture as a click invalidateClick(); DragOperation srcOp = DragOperationNone; freeClipboard(); // would only happen if we missed a dragEnd. Do it anyway, just // to make sure it gets numbified dragState().m_dragClipboard = createDraggingClipboard(); if (dragState().m_dragSrcMayBeDHTML) { // Check to see if the is a DOM based drag, if it is get the DOM specified drag // image and offset if (dragState().m_dragSrcIsDHTML) { int srcX, srcY; dragState().m_dragSrc->renderer()->absolutePosition(srcX, srcY); IntSize delta = m_mouseDownPos - IntPoint(srcX, srcY); dragState().m_dragClipboard->setDragImageElement(dragState().m_dragSrc.get(), IntPoint() + delta); } m_mouseDownMayStartDrag = dispatchDragSrcEvent(dragstartEvent, m_mouseDown) && !m_frame->selectionController()->isInPasswordField(); // Invalidate clipboard here against anymore pasteboard writing for security. The drag // image can still be changed as we drag, but not the pasteboard data. dragState().m_dragClipboard->setAccessPolicy(ClipboardImageWritable); if (m_mouseDownMayStartDrag) { // gather values from DHTML element, if it set any dragState().m_dragClipboard->sourceOperation(srcOp); // Yuck, dragSourceMovedTo() can be called as a result of kicking off the drag with // dragImage! Because of that dumb reentrancy, we may think we've not started the // drag when that happens. So we have to assume it's started before we kick it off. dragState().m_dragClipboard->setDragHasStarted(); } } if (m_mouseDownMayStartDrag) { DragController* dragController = m_frame->page() ? m_frame->page()->dragController() : 0; bool startedDrag = dragController && dragController->startDrag(m_frame, dragState().m_dragClipboard.get(), srcOp, event.event(), m_mouseDownPos, dragState().m_dragSrcIsDHTML); if (!startedDrag && dragState().m_dragSrcMayBeDHTML) { // Drag was canned at the last minute - we owe m_dragSrc a DRAGEND event dispatchDragSrcEvent(dragendEvent, event.event()); m_mouseDownMayStartDrag = false; } } if (!m_mouseDownMayStartDrag) { // something failed to start the drag, cleanup freeClipboard(); dragState().m_dragSrc = 0; } // No more default handling (like selection), whether we're past the hysteresis bounds or not return true; } bool EventHandler::handleTextInputEvent(const String& text, Event* underlyingEvent, bool isLineBreak, bool isBackTab) { if (!m_frame) return false; EventTarget* target; if (underlyingEvent) target = underlyingEvent->target(); else target = eventTargetNodeForDocument(m_frame->document()); if (!target) return false; RefPtr event = new TextEvent(m_frame->domWindow(), text); event->setUnderlyingEvent(underlyingEvent); event->setIsLineBreak(isLineBreak); event->setIsBackTab(isBackTab); ExceptionCode ec; return target->dispatchEvent(event.release(), ec, true); } #if !PLATFORM(MAC) && !PLATFORM(QT) bool EventHandler::invertSenseOfTabsToLinks(KeyboardEvent*) const { return false; } #endif bool EventHandler::tabsToLinks(KeyboardEvent* event) const { Page* page = m_frame->page(); if (!page) return false; if (page->chrome()->client()->tabsToLinks()) return !invertSenseOfTabsToLinks(event); return invertSenseOfTabsToLinks(event); } void EventHandler::defaultTextInputEventHandler(TextEvent* event) { String data = event->data(); if (data == "\t") { defaultTabEventHandler(event, event->isBackTab()); if (event->defaultHandled()) return; } if (data == "\n") { if (event->isLineBreak()) { if (m_frame->editor()->insertLineBreak()) event->setDefaultHandled(); } else { if (m_frame->editor()->insertParagraphSeparator()) event->setDefaultHandled(); } } else { if (m_frame->editor()->insertTextWithoutSendingTextEvent(data, false, event)) event->setDefaultHandled(); } } void EventHandler::defaultTabEventHandler(Event* event, bool isBackTab) { Page* page = m_frame->page(); // Tabs can be used in design mode editing. You can still move out with back tab. if (!page || !page->tabKeyCyclesThroughElements() || (m_frame->document()->inDesignMode() && !isBackTab)) return; FocusController* focus = page->focusController(); KeyboardEvent* keyboardEvent = findKeyboardEvent(event); bool handled; if (isBackTab) handled = focus->advanceFocus(FocusDirectionBackward, keyboardEvent); else handled = focus->advanceFocus(keyboardEvent); // get direction from keyboard event if (handled) event->setDefaultHandled(); } }