Introduce WebFrameWidget to Blink

Source/web/WebFrameWidgetImpl.cpp

+/*
+ * Copyright (C) 2014 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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 "web/WebFrameWidgetImpl.h"
+
+#include "core/editing/Editor.h"
+#include "core/editing/FrameSelection.h"
+#include "core/editing/InputMethodController.h"
+#include "core/editing/PlainTextRange.h"
+#include "core/frame/FrameHost.h"
+#include "core/frame/FrameView.h"
+#include "core/frame/RemoteFrame.h"
+#include "core/frame/Settings.h"
+#include "core/page/EventHandler.h"
+#include "core/page/FocusController.h"
+#include "core/page/Page.h"
+#include "core/rendering/HitTestResult.h"
+#include "core/rendering/RenderView.h"
+#include "core/rendering/compositing/RenderLayerCompositor.h"
+#include "platform/KeyboardCodes.h"
+#include "platform/NotImplemented.h"
+#include "platform/TraceEvent.h"
+#include "public/web/WebAXObject.h"
+#include "public/web/WebActiveWheelFlingParameters.h"
+#include "public/web/WebAutofillClient.h"
+#include "public/web/WebBeginFrameArgs.h"
+#include "public/web/WebFrameClient.h"
+#include "public/web/WebHitTestResult.h"
+#include "public/web/WebInputElement.h"
+#include "public/web/WebMediaPlayerAction.h"
+#include "public/web/WebNode.h"
+#include "public/web/WebPlugin.h"
+#include "public/web/WebPluginAction.h"
+#include "public/web/WebRange.h"
+#include "public/web/WebTextInputInfo.h"
+#include "public/web/WebViewClient.h"
+#include "public/web/WebWindowFeatures.h"
+#include "web/CompositionUnderlineVectorBuilder.h"
+#include "web/ContextFeaturesClientImpl.h"
+#include "web/DatabaseClientImpl.h"
+#include "web/FullscreenController.h"
+#include "web/GraphicsLayerFactoryChromium.h"
+#include "web/LinkHighlight.h"
+#include "web/NavigatorContentUtilsClientImpl.h"
+#include "web/PrerendererClientImpl.h"
+#include "web/SpeechRecognitionClientProxy.h"
+#include "web/StorageQuotaClientImpl.h"
+#include "web/ValidationMessageClientImpl.h"
+#include "web/ViewportAnchor.h"
+#include "web/WebDevToolsAgentImpl.h"
+#include "web/WebDevToolsAgentPrivate.h"
+#include "web/WebInputEventConversion.h"
+#include "web/WebLocalFrameImpl.h"
+#include "web/WebPluginContainerImpl.h"
+#include "web/WebRemoteFrameImpl.h"
+#include "web/WebSettingsImpl.h"
+#include "web/WebViewImpl.h"
+#include "web/WorkerGlobalScopeProxyProviderImpl.h"
+#include "web/painting/ContinuousPainter.h"
+#include "wtf/CurrentTime.h"
+#include "wtf/RefPtr.h"
+#include "wtf/TemporaryChange.h"
+
+namespace blink {
+
+// WebFrameWidget ----------------------------------------------------------------
+
+WebFrameWidget* WebFrameWidget::create(WebWidgetClient* client, WebView* webView)
+{
+    // Pass the WebFrameWidget's self-reference to the caller.
+    return WebFrameWidgetImpl::create(client, webView);
+}
+
+WebFrameWidgetImpl* WebFrameWidgetImpl::create(WebWidgetClient* client, WebView* webView)
+{
+    // Pass the WebFrameWidgetImpl's self-reference to the caller.
+    return adoptRef(new WebFrameWidgetImpl(client, webView)).leakRef();
+}
+
+void WebFrameWidgetImpl::setLocalRoot(WebLocalFrame* frame)
+{
+    m_localRoot = toWebLocalFrameImpl(frame);
+    m_localRoot->setFrameWidget(this);
+}
+
+WebFrameWidgetImpl::WebFrameWidgetImpl(WebWidgetClient* client, WebView* webView)
+    : m_client(client)
+    , m_localRoot(nullptr)
+    , m_layerTreeView(nullptr)
+    , m_rootLayer(nullptr)
+    , m_rootGraphicsLayer(nullptr)
+    , m_isAcceleratedCompositingActive(false)
+    , m_layerTreeViewClosed(false)
+    , m_page(toWebViewImpl(webView)->page())
+    , m_webView(toWebViewImpl(webView))
+    , m_suppressNextKeypressEvent(false)
+    , m_ignoreInputEvents(false)
+{
+    initializeLayerTreeView();
+}
+
+WebFrameWidgetImpl::~WebFrameWidgetImpl()
+{
+}
+
+// WebWidget ------------------------------------------------------------------
+
+void WebFrameWidgetImpl::close()
+{
+    // Reset the delegate to prevent notifications being sent as we're being
+    // deleted.
+    m_client = 0;
+
+    deref(); // Balances ref() acquired in WebFrameWidget::create
+}
+
+WebSize WebFrameWidgetImpl::size()
+{
+    return m_size;
+}
+
+void WebFrameWidgetImpl::willStartLiveResize()
+{
+    if (m_localRoot->frameView())
+        m_localRoot->frameView()->willStartLiveResize();
+
+    LocalFrame* frame = m_localRoot->frame();
+    WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
+    if (pluginContainer)
+        pluginContainer->willStartLiveResize();
+}
+
+void WebFrameWidgetImpl::resize(const WebSize& newSize)
+{
+    if (m_size == newSize)
+        return;
+
+    FrameView* view = m_localRoot->frameView();
+    if (!view)
+        return;
+
+    m_size = newSize;
+
+    updateMainFrameLayoutSize();
+
+    view->resize(m_size);
+
+    // FIXME: In WebViewImpl this layout was a precursor to setting the minimum scale limit.
+    // It is not clear if this is necessary for frame-level widget resize.
+    if (view->needsLayout())
+        view->layout();
+
+    // FIXME: Investigate whether this is needed; comment from eseidel suggests that this function
+    // is flawed.
+    sendResizeEventAndRepaint();
+}
+
+void WebFrameWidgetImpl::sendResizeEventAndRepaint()
+{
+    // FIXME: This is wrong. The FrameView is responsible sending a resizeEvent
+    // as part of layout. Layout is also responsible for sending invalidations
+    // to the embedder. This method and all callers may be wrong. -- eseidel.
+    if (m_localRoot->frameView()) {
+        // Enqueues the resize event.
+        m_localRoot->frame()->document()->enqueueResizeEvent();
+    }
+
+    if (m_client) {
+        if (isAcceleratedCompositingActive()) {
+            updateLayerTreeViewport();
+        } else {
+            WebRect damagedRect(0, 0, m_size.width, m_size.height);
+            m_client->didInvalidateRect(damagedRect);
+        }
+    }
+}
+
+void WebFrameWidgetImpl::resizePinchViewport(const WebSize& newSize)
+{
+    // TODO: Implement pinch viewport for out-of-process iframes.
+}
+
+void WebFrameWidgetImpl::updateMainFrameLayoutSize()
+{
+    if (!m_localRoot)
+        return;
+
+    RefPtr<FrameView> view = m_localRoot->frameView();
+    if (!view)
+        return;
+
+    WebSize layoutSize = m_size;
+
+    view->setLayoutSize(layoutSize);
+}
+
+void WebFrameWidgetImpl::willEndLiveResize()
+{
+    if (m_localRoot->frameView())
+        m_localRoot->frameView()->willEndLiveResize();
+
+    LocalFrame* frame = m_localRoot->frame();
+    WebPluginContainerImpl* pluginContainer = WebLocalFrameImpl::pluginContainerFromFrame(frame);
+    if (pluginContainer)
+        pluginContainer->willEndLiveResize();
+}
+
+void WebFrameWidgetImpl::willEnterFullScreen()
+{
+    // FIXME: Implement full screen for out-of-process iframes.
+}
+
+void WebFrameWidgetImpl::didEnterFullScreen()
+{
+    // FIXME: Implement full screen for out-of-process iframes.
+}
+
+void WebFrameWidgetImpl::willExitFullScreen()
+{
+    // FIXME: Implement full screen for out-of-process iframes.
+}
+
+void WebFrameWidgetImpl::didExitFullScreen()
+{
+    // FIXME: Implement full screen for out-of-process iframes.
+}
+
+void WebFrameWidgetImpl::beginFrame(const WebBeginFrameArgs& frameTime)
+{
+    TRACE_EVENT0("blink", "WebFrameWidgetImpl::beginFrame");
+
+    WebBeginFrameArgs validFrameTime(frameTime);
+    if (!validFrameTime.lastFrameTimeMonotonic)
+        validFrameTime.lastFrameTimeMonotonic = monotonicallyIncreasingTime();
+
+    PageWidgetDelegate::animate(*m_page, validFrameTime.lastFrameTimeMonotonic, *m_localRoot->frame());
+}
+
+void WebFrameWidgetImpl::layout()
+{
+    TRACE_EVENT0("blink", "WebFrameWidgetImpl::layout");
+    if (!m_localRoot)
+        return;
+
+    PageWidgetDelegate::layout(*m_page, *m_localRoot->frame());
+    updateLayerTreeBackgroundColor();
+}
+
+void WebFrameWidgetImpl::paint(WebCanvas* canvas, const WebRect& rect)
+{
+    // Out-of-process iframes require compositing.
+    ASSERT_NOT_REACHED();
+}
+
+
+void WebFrameWidgetImpl::updateLayerTreeViewport()
+{
+    if (!page() || !m_layerTreeView)
+        return;
+
+    // FIXME: We need access to page scale information from the WebView.
+    m_layerTreeView->setPageScaleFactorAndLimits(1, 1, 1);
+}
+
+void WebFrameWidgetImpl::updateLayerTreeBackgroundColor()
+{
+    if (!m_layerTreeView)
+        return;
+
+    m_layerTreeView->setBackgroundColor(alphaChannel(m_webView->backgroundColorOverride()) ? m_webView->backgroundColorOverride() : m_webView->backgroundColor());
+}
+
+void WebFrameWidgetImpl::updateLayerTreeDeviceScaleFactor()
+{
+    ASSERT(page());
+    ASSERT(m_layerTreeView);
+
+    float deviceScaleFactor = page()->deviceScaleFactor();
+    m_layerTreeView->setDeviceScaleFactor(deviceScaleFactor);
+}
+
+bool WebFrameWidgetImpl::isTransparent() const
+{
+    // FIXME: This might need to proxy to the WebView's isTransparent().
+    return false;
+}
+
+void WebFrameWidgetImpl::compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback* callback)
+{
+    m_layerTreeView->compositeAndReadbackAsync(callback);
+}
+
+bool WebFrameWidgetImpl::isTrackingRepaints() const
+{
+    return m_localRoot->frameView()->isTrackingPaintInvalidations();
+}
+
+void WebFrameWidgetImpl::themeChanged()
+{
+    FrameView* view = m_localRoot->frameView();
+
+    WebRect damagedRect(0, 0, m_size.width, m_size.height);
+    view->invalidateRect(damagedRect);
+}
+
+const WebInputEvent* WebFrameWidgetImpl::m_currentInputEvent = 0;
+
+// FIXME: autogenerate this kind of code, and use it throughout Blink rather than
+// the one-offs for subsets of these values.
+static String inputTypeToName(WebInputEvent::Type type)
+{
+    switch (type) {
+    case WebInputEvent::MouseDown:
+        return EventTypeNames::mousedown;
+    case WebInputEvent::MouseUp:
+        return EventTypeNames::mouseup;
+    case WebInputEvent::MouseMove:
+        return EventTypeNames::mousemove;
+    case WebInputEvent::MouseEnter:
+        return EventTypeNames::mouseenter;
+    case WebInputEvent::MouseLeave:
+        return EventTypeNames::mouseleave;
+    case WebInputEvent::ContextMenu:
+        return EventTypeNames::contextmenu;
+    case WebInputEvent::MouseWheel:
+        return EventTypeNames::mousewheel;
+    case WebInputEvent::KeyDown:
+        return EventTypeNames::keydown;
+    case WebInputEvent::KeyUp:
+        return EventTypeNames::keyup;
+    case WebInputEvent::GestureScrollBegin:
+        return EventTypeNames::gesturescrollstart;
+    case WebInputEvent::GestureScrollEnd:
+        return EventTypeNames::gesturescrollend;
+    case WebInputEvent::GestureScrollUpdate:
+        return EventTypeNames::gesturescrollupdate;
+    case WebInputEvent::GestureTapDown:
+        return EventTypeNames::gesturetapdown;
+    case WebInputEvent::GestureShowPress:
+        return EventTypeNames::gestureshowpress;
+    case WebInputEvent::GestureTap:
+        return EventTypeNames::gesturetap;
+    case WebInputEvent::GestureTapUnconfirmed:
+        return EventTypeNames::gesturetapunconfirmed;
+    case WebInputEvent::TouchStart:
+        return EventTypeNames::touchstart;
+    case WebInputEvent::TouchMove:
+        return EventTypeNames::touchmove;
+    case WebInputEvent::TouchEnd:
+        return EventTypeNames::touchend;
+    case WebInputEvent::TouchCancel:
+        return EventTypeNames::touchcancel;
+    default:
+        return String("unknown");
+    }
+}
+
+bool WebFrameWidgetImpl::handleInputEvent(const WebInputEvent& inputEvent)
+{
+
+    TRACE_EVENT1("input", "WebFrameWidgetImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type).ascii());
+
+    // Report the event to be NOT processed by WebKit, so that the browser can handle it appropriately.
+    if (m_ignoreInputEvents)
+        return false;
+
+    TemporaryChange<const WebInputEvent*> currentEventChange(m_currentInputEvent, &inputEvent);
+
+    if (m_mouseCaptureNode && WebInputEvent::isMouseEventType(inputEvent.type)) {
+        TRACE_EVENT1("input", "captured mouse event", "type", inputEvent.type);
+        // Save m_mouseCaptureNode since mouseCaptureLost() will clear it.
+        RefPtrWillBeRawPtr<Node> node = m_mouseCaptureNode;
+
+        // Not all platforms call mouseCaptureLost() directly.
+        if (inputEvent.type == WebInputEvent::MouseUp)
+            mouseCaptureLost();
+
+        OwnPtr<UserGestureIndicator> gestureIndicator;
+
+        AtomicString eventType;
+        switch (inputEvent.type) {
+        case WebInputEvent::MouseMove:
+            eventType = EventTypeNames::mousemove;
+            break;
+        case WebInputEvent::MouseLeave:
+            eventType = EventTypeNames::mouseout;
+            break;
+        case WebInputEvent::MouseDown:
+            eventType = EventTypeNames::mousedown;
+            gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingNewUserGesture));
+            m_mouseCaptureGestureToken = gestureIndicator->currentToken();
+            break;
+        case WebInputEvent::MouseUp:
+            eventType = EventTypeNames::mouseup;
+            gestureIndicator = adoptPtr(new UserGestureIndicator(m_mouseCaptureGestureToken.release()));
+            break;
+        default:
+            ASSERT_NOT_REACHED();
+        }
+
+        node->dispatchMouseEvent(
+            PlatformMouseEventBuilder(m_localRoot->frameView(), static_cast<const WebMouseEvent&>(inputEvent)),
+            eventType, static_cast<const WebMouseEvent&>(inputEvent).clickCount);
+        return true;
+    }
+
+    return PageWidgetDelegate::handleInputEvent(*this, inputEvent, m_localRoot->frame());
+}
+
+void WebFrameWidgetImpl::setCursorVisibilityState(bool isVisible)
+{
+    if (m_page)

[dcheng, 2014/12/16 20:13:06]

Why might page be null here and not elsewhere? Do we, in fact, need to clear
page at some point?

[kenrb, 2014/12/16 22:04:12]

I reproduced the checks in WebViewImpl, even though the expectations might be a
bit different. It seems the most conservative approach and without adequate test
coverage it is hard to tell where bugs will come from.

[dcheng, 2014/12/16 23:20:20]

Well, we don't currently ever null out the page. So it seems like these checks
don't do anything. For the sake of making this review simpler, we can just FIXME
the m_page/m_webView members for now and mention that we need to think more
about WebFrameWidget shutdown, and handle it in a followup patch.

[kenrb, 2014/12/17 14:52:31]

Sounds good.

+        m_page->setIsCursorVisible(isVisible);
+}
+
+void WebFrameWidgetImpl::hasTouchEventHandlers(bool hasTouchHandlers)
+{
+    if (m_client)
+        m_client->hasTouchEventHandlers(hasTouchHandlers);
+}
+
+bool WebFrameWidgetImpl::hasTouchEventHandlersAt(const WebPoint& point)
+{
+    // FIXME: Implement this. Note that the point must be divided by pageScaleFactor.
+    return true;
+}
+
+void WebFrameWidgetImpl::scheduleAnimation()
+{
+    if (m_layerTreeView) {
+        m_layerTreeView->setNeedsAnimate();
+        return;
+    }
+    if (m_client)
+        m_client->scheduleAnimation();
+}
+
+void WebFrameWidgetImpl::applyViewportDeltas(
+    const WebSize& pinchViewportDelta,
+    const WebSize& mainFrameDelta,
+    float pageScaleDelta,
+    float topControlsDelta)
+{
+    // FIXME: To be implemented.
+}
+
+void WebFrameWidgetImpl::applyViewportDeltas(const WebSize& scrollDelta, float pageScaleDelta, float topControlsDelta)
+{
+    // FIXME: To be implemented.
+}
+
+void WebFrameWidgetImpl::mouseCaptureLost()
+{
+    TRACE_EVENT_ASYNC_END0("input", "capturing mouse", this);
+    m_mouseCaptureNode = nullptr;
+}
+
+void WebFrameWidgetImpl::setFocus(bool enable)
+{
+    m_page->focusController().setFocused(enable);
+    if (enable) {
+        m_page->focusController().setActive(true);
+        RefPtr<Frame> focusedFrame = m_page->focusController().focusedFrame();
+        if (focusedFrame && focusedFrame->isLocalFrame()) {
+            LocalFrame* localFrame = toLocalFrame(focusedFrame.get());
+            Element* element = localFrame->document()->focusedElement();
+            if (element && localFrame->selection().selection().isNone()) {
+                // If the selection was cleared while the WebView was not
+                // focused, then the focus element shows with a focus ring but
+                // no caret and does respond to keyboard inputs.
+                if (element->isTextFormControl()) {
+                    element->updateFocusAppearance(true);
+                } else if (element->isContentEditable()) {
+                    // updateFocusAppearance() selects all the text of
+                    // contentseditable DIVs. So we set the selection explicitly
+                    // instead. Note that this has the side effect of moving the
+                    // caret back to the beginning of the text.
+                    Position position(element, 0, Position::PositionIsOffsetInAnchor);
+                    localFrame->selection().setSelection(VisibleSelection(position, SEL_DEFAULT_AFFINITY));
+                }
+            }
+        }
+    }
+}
+
+bool WebFrameWidgetImpl::setComposition(
+    const WebString& text,
+    const WebVector<WebCompositionUnderline>& underlines,
+    int selectionStart,
+    int selectionEnd)
+{
+    // FIXME: To be implemented.
+    return false;
+}
+
+bool WebFrameWidgetImpl::confirmComposition()
+{
+    // FIXME: To be implemented.
+    return false;
+}
+
+bool WebFrameWidgetImpl::confirmComposition(ConfirmCompositionBehavior selectionBehavior)
+{
+    // FIXME: To be implemented.
+    return false;
+}
+
+bool WebFrameWidgetImpl::confirmComposition(const WebString& text)
+{
+    // FIXME: To be implemented.
+    return false;
+}
+
+bool WebFrameWidgetImpl::compositionRange(size_t* location, size_t* length)
+{
+    // FIXME: To be implemented.
+    return false;
+}
+
+WebTextInputInfo WebFrameWidgetImpl::textInputInfo()
+{
+    WebTextInputInfo info;
+    // FIXME: To be implemented.
+    return info;
+}
+
+WebColor WebFrameWidgetImpl::backgroundColor() const
+{
+    if (isTransparent())
+        return Color::transparent;
+    if (!m_localRoot->frameView())
+        return m_webView->backgroundColor();
+    FrameView* view = m_localRoot->frameView();
+    return view->documentBackgroundColor().rgb();
+}
+
+bool WebFrameWidgetImpl::selectionBounds(WebRect& anchor, WebRect& focus) const
+{
+    const Frame* frame = focusedCoreFrame();
+    if (!frame || !frame->isLocalFrame())
+        return false;
+
+    const LocalFrame* localFrame = toLocalFrame(frame);
+    if (!localFrame)
+        return false;
+    FrameSelection& selection = localFrame->selection();
+
+    if (selection.isCaret()) {
+        anchor = focus = selection.absoluteCaretBounds();
+    } else {
+        RefPtrWillBeRawPtr<Range> selectedRange = selection.toNormalizedRange();
+        if (!selectedRange)
+            return false;
+
+        RefPtrWillBeRawPtr<Range> range(Range::create(selectedRange->startContainer()->document(),
+            selectedRange->startContainer(),
+            selectedRange->startOffset(),
+            selectedRange->startContainer(),
+            selectedRange->startOffset()));
+        anchor = localFrame->editor().firstRectForRange(range.get());
+
+        range = Range::create(selectedRange->endContainer()->document(),
+            selectedRange->endContainer(),
+            selectedRange->endOffset(),
+            selectedRange->endContainer(),
+            selectedRange->endOffset());
+        focus = localFrame->editor().firstRectForRange(range.get());
+    }
+
+    IntRect scaledAnchor(localFrame->view()->contentsToWindow(anchor));
+    IntRect scaledFocus(localFrame->view()->contentsToWindow(focus));
+
+    anchor = scaledAnchor;
+    focus = scaledFocus;
+
+    if (!selection.selection().isBaseFirst())
+        std::swap(anchor, focus);
+    return true;
+}
+
+bool WebFrameWidgetImpl::selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const
+{
+    if (!focusedCoreFrame()->isLocalFrame())
+        return false;
+    const LocalFrame* frame = toLocalFrame(focusedCoreFrame());
+    if (!frame)
+        return false;
+    FrameSelection& selection = frame->selection();
+    if (!selection.toNormalizedRange())
+        return false;
+    start = toWebTextDirection(selection.start().primaryDirection());
+    end = toWebTextDirection(selection.end().primaryDirection());
+    return true;
+}
+
+bool WebFrameWidgetImpl::isSelectionAnchorFirst() const
+{
+    if (!focusedCoreFrame()->isLocalFrame())
+        return false;
+    if (const LocalFrame* frame = toLocalFrame(focusedCoreFrame()))
+        return frame->selection().selection().isBaseFirst();
+    return false;
+}
+
+bool WebFrameWidgetImpl::caretOrSelectionRange(size_t* location, size_t* length)
+{
+    if (!focusedCoreFrame()->isLocalFrame())
+        return false;
+    const LocalFrame* focused = toLocalFrame(focusedCoreFrame());
+    if (!focused)
+        return false;
+
+    PlainTextRange selectionOffsets = focused->inputMethodController().getSelectionOffsets();
+    if (selectionOffsets.isNull())
+        return false;
+
+    *location = selectionOffsets.start();
+    *length = selectionOffsets.length();
+    return true;
+}
+
+void WebFrameWidgetImpl::setTextDirection(WebTextDirection direction)
+{
+    // The Editor::setBaseWritingDirection() function checks if we can change
+    // the text direction of the selected node and updates its DOM "dir"
+    // attribute and its CSS "direction" property.
+    // So, we just call the function as Safari does.
+    if (!focusedCoreFrame()->isLocalFrame())
+        return;
+    const LocalFrame* focused = toLocalFrame(focusedCoreFrame());
+    if (!focused)
+        return;
+
+    Editor& editor = focused->editor();
+    if (!editor.canEdit())
+        return;
+
+    switch (direction) {
+    case WebTextDirectionDefault:
+        editor.setBaseWritingDirection(NaturalWritingDirection);
+        break;
+
+    case WebTextDirectionLeftToRight:
+        editor.setBaseWritingDirection(LeftToRightWritingDirection);
+        break;
+
+    case WebTextDirectionRightToLeft:
+        editor.setBaseWritingDirection(RightToLeftWritingDirection);
+        break;
+
+    default:
+        notImplemented();
+        break;
+    }
+}
+
+bool WebFrameWidgetImpl::isAcceleratedCompositingActive() const
+{
+    return m_isAcceleratedCompositingActive;
+}
+
+void WebFrameWidgetImpl::willCloseLayerTreeView()
+{
+    setIsAcceleratedCompositingActive(false);
+    m_layerTreeView = 0;
+    m_layerTreeViewClosed = true;
+}
+
+void WebFrameWidgetImpl::didChangeWindowResizerRect()
+{
+    if (m_localRoot->frameView())
+        m_localRoot->frameView()->windowResizerRectChanged();
+}
+
+void WebFrameWidgetImpl::handleMouseLeave(LocalFrame& mainFrame, const WebMouseEvent& event)
+{
+    // FIXME: WebWidget doesn't have the method below.
+    // m_client->setMouseOverURL(WebURL());
+    PageWidgetEventHandler::handleMouseLeave(mainFrame, event);
+}
+
+void WebFrameWidgetImpl::handleMouseDown(LocalFrame& mainFrame, const WebMouseEvent& event)
+{
+    // Take capture on a mouse down on a plugin so we can send it mouse events.
+    // If the hit node is a plugin but a scrollbar is over it don't start mouse
+    // capture because it will interfere with the scrollbar receiving events.
+    IntPoint point(event.x, event.y);
+    if (event.button == WebMouseEvent::ButtonLeft) {
+        point = m_localRoot->frameView()->windowToContents(point);
+        HitTestResult result(m_localRoot->frame()->eventHandler().hitTestResultAtPoint(point));
+        result.setToShadowHostIfInUserAgentShadowRoot();
+        Node* hitNode = result.innerNonSharedNode();
+
+        if (!result.scrollbar() && hitNode && hitNode->renderer() && hitNode->renderer()->isEmbeddedObject()) {
+            m_mouseCaptureNode = hitNode;
+            TRACE_EVENT_ASYNC_BEGIN0("input", "capturing mouse", this);
+        }
+    }
+
+    PageWidgetEventHandler::handleMouseDown(mainFrame, event);
+
+    if (event.button == WebMouseEvent::ButtonLeft && m_mouseCaptureNode)
+        m_mouseCaptureGestureToken = mainFrame.eventHandler().takeLastMouseDownGestureToken();
+
+    // FIXME: Add context menu support.
+}
+
+void WebFrameWidgetImpl::handleMouseUp(LocalFrame& mainFrame, const WebMouseEvent& event)
+{
+    PageWidgetEventHandler::handleMouseUp(mainFrame, event);
+
+    // FIXME: Add context menu support (Windows).
+}
+
+bool WebFrameWidgetImpl::handleMouseWheel(LocalFrame& mainFrame, const WebMouseWheelEvent& event)
+{
+    return PageWidgetEventHandler::handleMouseWheel(mainFrame, event);
+}
+
+bool WebFrameWidgetImpl::handleGestureEvent(const WebGestureEvent& event)
+{
+    // FIXME: Add gesture support.
+    return false;
+}
+
+bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
+{
+    ASSERT((event.type == WebInputEvent::RawKeyDown)
+        || (event.type == WebInputEvent::KeyDown)
+        || (event.type == WebInputEvent::KeyUp));
+
+    // Please refer to the comments explaining the m_suppressNextKeypressEvent
+    // member.
+    // The m_suppressNextKeypressEvent is set if the KeyDown is handled by
+    // Webkit. A keyDown event is typically associated with a keyPress(char)
+    // event and a keyUp event. We reset this flag here as this is a new keyDown
+    // event.
+    m_suppressNextKeypressEvent = false;
+
+    RefPtr<Frame> focusedFrame = focusedCoreFrame();
+    if (focusedFrame && focusedFrame->isRemoteFrame()) {
+        WebRemoteFrameImpl* webFrame = WebRemoteFrameImpl::fromFrame(*toRemoteFrame(focusedFrame.get()));
+        webFrame->client()->forwardInputEvent(&event);
+        return true;
+    }
+
+    if (!focusedFrame || !focusedFrame->isLocalFrame())
+        return false;
+
+    RefPtr<LocalFrame> frame = toLocalFrame(focusedFrame.get());
+
+    PlatformKeyboardEventBuilder evt(event);
+
+    if (frame->eventHandler().keyEvent(evt)) {
+        if (WebInputEvent::RawKeyDown == event.type) {
+            // Suppress the next keypress event unless the focused node is a plug-in node.
+            // (Flash needs these keypress events to handle non-US keyboards.)
+            Element* element = focusedElement();
+            if (!element || !element->renderer() || !element->renderer()->isEmbeddedObject())
+                m_suppressNextKeypressEvent = true;
+        }
+        return true;
+    }
+
+    return keyEventDefault(event);
+}
+
+bool WebFrameWidgetImpl::handleCharEvent(const WebKeyboardEvent& event)
+{
+    ASSERT(event.type == WebInputEvent::Char);
+
+    // Please refer to the comments explaining the m_suppressNextKeypressEvent
+    // member.  The m_suppressNextKeypressEvent is set if the KeyDown is
+    // handled by Webkit. A keyDown event is typically associated with a
+    // keyPress(char) event and a keyUp event. We reset this flag here as it
+    // only applies to the current keyPress event.
+    bool suppress = m_suppressNextKeypressEvent;
+    m_suppressNextKeypressEvent = false;
+
+    LocalFrame* frame = toLocalFrame(focusedCoreFrame());
+    if (!frame)
+        return suppress;
+
+    EventHandler& handler = frame->eventHandler();
+
+    PlatformKeyboardEventBuilder evt(event);
+    if (!evt.isCharacterKey())
+        return true;
+
+    // Accesskeys are triggered by char events and can't be suppressed.
+    if (handler.handleAccessKey(evt))
+        return true;
+
+    // Safari 3.1 does not pass off windows system key messages (WM_SYSCHAR) to
+    // the eventHandler::keyEvent. We mimic this behavior on all platforms since
+    // for now we are converting other platform's key events to windows key
+    // events.
+    if (evt.isSystemKey())
+        return false;
+
+    if (!suppress && !handler.keyEvent(evt))
+        return keyEventDefault(event);
+
+    return true;
+}
+
+
+bool WebFrameWidgetImpl::keyEventDefault(const WebKeyboardEvent& event)
+{
+    LocalFrame* frame = toLocalFrame(focusedCoreFrame());
+    if (!frame)
+        return false;
+
+    switch (event.type) {
+    case WebInputEvent::Char:
+        if (event.windowsKeyCode == VKEY_SPACE) {
+            int keyCode = ((event.modifiers & WebInputEvent::ShiftKey) ? VKEY_PRIOR : VKEY_NEXT);
+            return scrollViewWithKeyboard(keyCode, event.modifiers);
+        }
+        break;
+    case WebInputEvent::RawKeyDown:
+        if (event.modifiers == WebInputEvent::ControlKey) {
+            switch (event.windowsKeyCode) {
+#if !OS(MACOSX)
+            case 'A':
+                WebFrame::fromFrame(focusedCoreFrame())->executeCommand(WebString::fromUTF8("SelectAll"));
+                return true;
+            case VKEY_INSERT:
+            case 'C':
+                WebFrame::fromFrame(focusedCoreFrame())->executeCommand(WebString::fromUTF8("Copy"));
+                return true;
+#endif
+            // Match FF behavior in the sense that Ctrl+home/end are the only Ctrl
+            // key combinations which affect scrolling. Safari is buggy in the
+            // sense that it scrolls the page for all Ctrl+scrolling key
+            // combinations. For e.g. Ctrl+pgup/pgdn/up/down, etc.
+            case VKEY_HOME:
+            case VKEY_END:
+                break;
+            default:
+                return false;
+            }
+        }
+        if (!event.isSystemKey && !(event.modifiers & WebInputEvent::ShiftKey))
+            return scrollViewWithKeyboard(event.windowsKeyCode, event.modifiers);
+        break;
+    default:
+        break;
+    }
+    return false;
+}
+
+bool WebFrameWidgetImpl::scrollViewWithKeyboard(int keyCode, int modifiers)
+{
+    ScrollDirection scrollDirection;
+    ScrollGranularity scrollGranularity;
+#if OS(MACOSX)
+    // Control-Up/Down should be PageUp/Down on Mac.
+    if (modifiers & WebMouseEvent::ControlKey) {
+        if (keyCode == VKEY_UP)
+            keyCode = VKEY_PRIOR;
+        else if (keyCode == VKEY_DOWN)
+            keyCode = VKEY_NEXT;
+    }
+#endif
+    if (!mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity))
+        return false;
+
+    if (LocalFrame* frame = toLocalFrame(focusedCoreFrame()))
+        return frame->eventHandler().bubblingScroll(scrollDirection, scrollGranularity);
+    return false;
+}
+
+bool WebFrameWidgetImpl::mapKeyCodeForScroll(
+    int keyCode,
+    ScrollDirection* scrollDirection,
+    ScrollGranularity* scrollGranularity)
+{
+    switch (keyCode) {
+    case VKEY_LEFT:
+        *scrollDirection = ScrollLeft;
+        *scrollGranularity = ScrollByLine;
+        break;
+    case VKEY_RIGHT:
+        *scrollDirection = ScrollRight;
+        *scrollGranularity = ScrollByLine;
+        break;
+    case VKEY_UP:
+        *scrollDirection = ScrollUp;
+        *scrollGranularity = ScrollByLine;
+        break;
+    case VKEY_DOWN:
+        *scrollDirection = ScrollDown;
+        *scrollGranularity = ScrollByLine;
+        break;
+    case VKEY_HOME:
+        *scrollDirection = ScrollUp;
+        *scrollGranularity = ScrollByDocument;
+        break;
+    case VKEY_END:
+        *scrollDirection = ScrollDown;
+        *scrollGranularity = ScrollByDocument;
+        break;
+    case VKEY_PRIOR: // page up
+        *scrollDirection = ScrollUp;
+        *scrollGranularity = ScrollByPage;
+        break;
+    case VKEY_NEXT: // page down
+        *scrollDirection = ScrollDown;
+        *scrollGranularity = ScrollByPage;
+        break;
+    default:
+        return false;
+    }
+
+    return true;
+}
+
+Frame* WebFrameWidgetImpl::focusedCoreFrame() const
+{
+    return m_page ? m_page->focusController().focusedOrMainFrame() : 0;
+}
+
+Element* WebFrameWidgetImpl::focusedElement() const
+{
+    Frame* frame = m_page->focusController().focusedFrame();
+    if (!frame || !frame->isLocalFrame())
+        return 0;
+
+    Document* document = toLocalFrame(frame)->document();
+    if (!document)
+        return 0;
+
+    return document->focusedElement();
+}
+
+void WebFrameWidgetImpl::initializeLayerTreeView()
+{
+    if (m_client) {
+        m_client->initializeLayerTreeView();
+        m_layerTreeView = m_client->layerTreeView();
+    }
+
+    m_page->settings().setAcceleratedCompositingEnabled(m_layerTreeView != 0);
+
+    // FIXME: only unittests, click to play, Android priting, and printing (for headers and footers)
+    // make this assert necessary. We should make them not hit this code and then delete allowsBrokenNullLayerTreeView.
+    ASSERT(m_layerTreeView || !m_client || m_client->allowsBrokenNullLayerTreeView());
+}
+
+void WebFrameWidgetImpl::setIsAcceleratedCompositingActive(bool active)
+{
+    // In the middle of shutting down; don't try to spin back up a compositor.
+    // FIXME: compositing startup/shutdown should be refactored so that it
+    // turns on explicitly rather than lazily, which causes this awkwardness.
+    if (m_layerTreeViewClosed)
+        return;
+
+    ASSERT(!active || m_layerTreeView);
+
+    if (m_isAcceleratedCompositingActive == active)
+        return;
+
+    if (!m_client)
+        return;
+
+    if (active) {
+        TRACE_EVENT0("blink", "WebViewImpl::setIsAcceleratedCompositingActive(true)");
+        m_layerTreeView->setRootLayer(*m_rootLayer);
+
+        bool visible = page()->visibilityState() == PageVisibilityStateVisible;
+        m_layerTreeView->setVisible(visible);
+        updateLayerTreeDeviceScaleFactor();
+        updateLayerTreeBackgroundColor();
+        m_layerTreeView->setHasTransparentBackground(isTransparent());
+        updateLayerTreeViewport();
+        m_isAcceleratedCompositingActive = true;
+    }
+    if (m_localRoot->frameView())
+        m_localRoot->frameView()->setClipsRepaints(!m_isAcceleratedCompositingActive);
+}
+
+RenderLayerCompositor* WebFrameWidgetImpl::compositor() const
+{
+    LocalFrame* frame = toLocalFrame(toCoreFrame(m_localRoot));
+    if (!frame || !frame->document() || !frame->document()->renderView())
+        return 0;
+
+    return frame->document()->renderView()->compositor();
+}
+
+void WebFrameWidgetImpl::suppressInvalidations(bool enable)
+{
+    if (m_client)
+        m_client->suppressCompositorScheduling(enable);
+}
+
+void WebFrameWidgetImpl::setRootGraphicsLayer(GraphicsLayer* layer)
+{
+    suppressInvalidations(true);
+
+    m_rootGraphicsLayer = layer;
+    m_rootLayer = layer ? layer->platformLayer() : 0;
+
+    setIsAcceleratedCompositingActive(layer != 0);
+
+    if (m_layerTreeView) {
+        if (m_rootLayer) {
+            m_layerTreeView->setRootLayer(*m_rootLayer);
+            // We register viewport layers here since there may not be a layer
+            // tree view prior to this point.
+            GraphicsLayer* rootScrollLayer = compositor()->scrollLayer();
+            ASSERT(rootScrollLayer);
+            WebLayer* pageScaleLayer = rootScrollLayer->parent() ? rootScrollLayer->parent()->platformLayer() : 0;
+            m_layerTreeView->registerViewportLayers(0, pageScaleLayer, rootScrollLayer->platformLayer(), 0);
+        } else {
+            m_layerTreeView->clearRootLayer();
+            m_layerTreeView->clearViewportLayers();
+        }
+    }
+
+    suppressInvalidations(false);
+}
+
+} // namespace blink