eventhandler.cpp

来自「linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自Web」· C++ 代码 · 共 1,735 行 · 第 1/5 页

    
    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, bool ignoreClipping)
{
    HitTestResult result(point);
    if (!m_frame->contentRenderer())
        return result;
    int hitType = HitTestRequest::ReadOnly | HitTestRequest::Active;
    if (ignoreClipping)
        hitType |= HitTestRequest::IgnoreClipping;
    m_frame->contentRenderer()->layer()->hitTest(HitTestRequest(hitType), result);

    while (true) {
        Node* n = result.innerNode();
        if (!result.isOverWidget() || !n || !n->renderer() || !n->renderer()->isWidget())
            break;
        RenderWidget* renderWidget = static_cast<RenderWidget*>(n->renderer());
        Widget* widget = renderWidget->widget();
        if (!widget || !widget->isFrameView())
            break;
        Frame* frame = static_cast<HTMLFrameElementBase*>(n)->contentFrame();
        if (!frame || !frame->contentRenderer())
            break;
        FrameView* view = static_cast<FrameView*>(widget);
        IntPoint widgetPoint(result.localPoint().x() + view->scrollX() - renderWidget->borderLeft() - renderWidget->paddingLeft(), 
            result.localPoint().y() + view->scrollY() - renderWidget->borderTop() - renderWidget->paddingTop());
        HitTestResult widgetHitTestResult(widgetPoint);
        frame->contentRenderer()->layer()->hitTest(HitTestRequest(hitType), widgetHitTestResult);
        result = widgetHitTestResult;
    }
    
    // If our HitTestResult is not visible, then we started hit testing too far down the frame chain. 
    // Another hit test at the main frame level should get us the correct visible result.
    Frame* resultFrame = result.innerNonSharedNode() ? result.innerNonSharedNode()->document()->frame() : 0;
    Frame* mainFrame = m_frame->page()->mainFrame();
    if (m_frame != mainFrame && resultFrame && resultFrame != mainFrame && !resultFrame->editor()->insideVisibleArea(result.point())) {
        IntPoint windowPoint = resultFrame->view()->contentsToWindow(result.point());
        IntPoint mainFramePoint = mainFrame->view()->windowToContents(windowPoint);
        result = mainFrame->eventHandler()->hitTestResultAtPoint(mainFramePoint, allowShadowContent, ignoreClipping);
    }

    if (!allowShadowContent)
        result.setToNonShadowAncestor();

    return result;
}


void EventHandler::startAutoscrollTimer()
{
    m_autoscrollTimer.startRepeating(autoscrollInterval);
}

void EventHandler::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
{
    if (m_autoscrollInProgress) {
        if (m_mouseDownWasInSubframe) {
            if (Frame* subframe = subframeForTargetNode(m_mousePressNode.get()))
                subframe->eventHandler()->stopAutoscrollTimer(rendererIsBeingDestroyed);
            return;
        }
    }

    if (autoscrollRenderer()) {
        if (!rendererIsBeingDestroyed && (m_autoscrollInProgress || m_panScrollInProgress))
            toRenderBox(autoscrollRenderer())->stopAutoscroll();
#if ENABLE(PAN_SCROLLING)
        if (m_panScrollInProgress) {
            m_frame->view()->removePanScrollIcon();
            m_frame->view()->setCursor(pointerCursor());
        }
#endif

        setAutoscrollRenderer(0);
    }

    m_autoscrollTimer.stop();

    m_panScrollInProgress = false;
    // If we're not in the top frame we notify it that we are not using the panScroll anymore
    if (m_frame->page() && m_frame != m_frame->page()->mainFrame())
            m_frame->page()->mainFrame()->eventHandler()->setPanScrollInProgress(false);
    m_autoscrollInProgress = false;
}

Node* EventHandler::mousePressNode() const
{
    return m_mousePressNode.get();
}

void EventHandler::setMousePressNode(PassRefPtr<Node> node)
{
    m_mousePressNode = node;
}

bool EventHandler::scrollOverflow(ScrollDirection direction, ScrollGranularity granularity)
{
    Node* node = m_frame->document()->focusedNode();
    if (!node)
        node = m_mousePressNode.get();
    
    if (node) {
        RenderObject* r = node->renderer();
        if (r && !r->isListBox())
            return r->enclosingBox()->scroll(direction, granularity);
    }

    return false;
}

IntPoint EventHandler::currentMousePosition() const
{
    return m_currentMousePosition;
}

Frame* subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
{
    if (!hitTestResult.isOverWidget())
        return 0;
    return subframeForTargetNode(hitTestResult.targetNode());
}

Frame* subframeForTargetNode(Node* node)
{
    if (!node)
        return 0;

    RenderObject* renderer = node->renderer();
    if (!renderer || !renderer->isWidget())
        return 0;

    Widget* widget = static_cast<RenderWidget*>(renderer)->widget();
    if (!widget || !widget->isFrameView())
        return 0;

    return static_cast<FrameView*>(widget)->frame();
}

static bool isSubmitImage(Node* node)
{
    return node && node->hasTagName(inputTag)
        && static_cast<HTMLInputElement*>(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->selection()->rootEditableElement() != node->rootEditableElement();
}

Cursor EventHandler::selectCursor(const MouseEventWithHitTestResults& event, Scrollbar* 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->selection()->isCaretOrRange() && !m_capturingMouseEventsNode)
        return iBeamCursor();

    Node* node = event.targetNode();
    RenderObject* renderer = node ? node->renderer() : 0;
    RenderStyle* style = renderer ? renderer->style() : 0;

    if (renderer && renderer->isFrameSet()) {
        RenderFrameSet* fs = static_cast<RenderFrameSet*>(renderer);
        if (fs->canResizeRow(event.localPoint()))
            return rowResizeCursor();
        if (fs->canResizeColumn(event.localPoint()))
            return columnResizeCursor();
    }

    if (style && style->cursors()) {
        const CursorList* cursors = style->cursors();
        for (unsigned i = 0; i < cursors->size(); ++i) {
            CachedImage* cimage = (*cursors)[i].cursorImage.get();
            IntPoint hotSpot = (*cursors)[i].hotSpot;
            if (!cimage)
                continue;
            // Limit the size of cursors so that they cannot be used to cover UI elements in chrome.
            IntSize size = cimage->image()->size();
            if (size.width() > 128 || size.height() > 128)
                continue;
            // Do not let the hotspot be outside the bounds of the image. 
            if (hotSpot.x() < 0 || hotSpot.y() < 0 || hotSpot.x() > size.width() || hotSpot.y() > size.height())
                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() && node->canStartSelection())) && !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();
        case CURSOR_WEBKIT_GRAB:
            return grabCursor();
        case CURSOR_WEBKIT_GRABBING:
            return grabbingCursor();
    }
    return pointerCursor();
}

bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
{
    RefPtr<FrameView> protector(m_frame->view());

    m_mousePressed = true;
    m_capturesDragging = 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;

    HitTestRequest request(HitTestRequest::Active);
    MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);

    if (!mev.targetNode()) {
        invalidateClick();
        return false;
    }

    m_mousePressNode = mev.targetNode();

    InspectorController* inspector = m_frame->page()->inspectorController();
    if (inspector && inspector->enabled() && inspector->searchingForNodeInPage()) {
        inspector->handleMousePressOnNode(m_mousePressNode.get());
        invalidateClick();
        return true;
    }

    Frame* subframe = subframeForHitTestResult(mev);
    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.
        m_capturesDragging = subframe->eventHandler()->capturesDragging();
        if (m_mousePressed && m_capturesDragging)
            m_capturingMouseEventsNode = mev.targetNode();
        invalidateClick();
        return true;