eventhandlerchromium.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 159 行

/*
 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Google Inc.
 *
 * 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 "ChromiumDataObject.h"
#include "ClipboardChromium.h"
#include "Cursor.h"
#include "FloatPoint.h"
#include "FocusController.h"
#include "FrameView.h"
#include "Frame.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "MouseEventWithHitTestResults.h"
#include "NotImplemented.h"
#include "Page.h"
#include "PlatformKeyboardEvent.h"
#include "PlatformWheelEvent.h"
#include "RenderWidget.h"
#include "SelectionController.h"

namespace WebCore {

#if PLATFORM(DARWIN)
const double EventHandler::TextDragDelay = 0.15;
#else
const double EventHandler::TextDragDelay = 0.0;
#endif

bool EventHandler::passMousePressEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
    // If we're clicking into a frame that is selected, the frame will appear
    // greyed out even though we're clicking on the selection.  This looks
    // really strange (having the whole frame be greyed out), so we deselect the
    // selection.
    IntPoint p = m_frame->view()->windowToContents(mev.event().pos());
    if (m_frame->selection()->contains(p)) {
        VisiblePosition visiblePos(
            mev.targetNode()->renderer()->positionForPoint(mev.localPoint()));
        VisibleSelection newSelection(visiblePos);
        if (m_frame->shouldChangeSelection(newSelection))
            m_frame->selection()->setSelection(newSelection);
    }

    subframe->eventHandler()->handleMousePressEvent(mev.event());
    return true;
}

bool EventHandler::passMouseMoveEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe, HitTestResult* hoveredNode)
{
    if (m_mouseDownMayStartDrag && !m_mouseDownWasInSubframe)
        return false;
    subframe->eventHandler()->handleMouseMoveEvent(mev.event(), hoveredNode);
    return true;
}

bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
    subframe->eventHandler()->handleMouseReleaseEvent(mev.event());
    return true;
}

bool EventHandler::passWheelEventToWidget(PlatformWheelEvent& wheelEvent, Widget* widget)
{
    // We can sometimes get a null widget!  EventHandlerMac handles a null
    // widget by returning false, so we do the same.
    if (!widget)
        return false;

    // If not a FrameView, then probably a plugin widget.  Those will receive
    // the event via an EventTargetNode dispatch when this returns false.
    if (!widget->isFrameView())
        return false;

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

bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)
{
    // Figure out which view to send the event to.
    if (!event.targetNode() || !event.targetNode()->renderer() || !event.targetNode()->renderer()->isWidget())
        return false;

    return passMouseDownEventToWidget(static_cast<RenderWidget*>(event.targetNode()->renderer())->widget());
}

bool EventHandler::passMouseDownEventToWidget(Widget* widget)
{
    notImplemented();
    return false;
}

bool EventHandler::tabsToAllControls(KeyboardEvent*) const
{
    return true;
}

bool EventHandler::eventActivatedView(const PlatformMouseEvent& event) const
{
    // FIXME: EventHandlerWin.cpp does the following:
    // return event.activatedWebView();
    return false;
}

PassRefPtr<Clipboard> EventHandler::createDraggingClipboard() const
{
    RefPtr<ChromiumDataObject> dataObject = ChromiumDataObject::create();
    return ClipboardChromium::create(true, dataObject.get(), ClipboardWritable);
}

void EventHandler::focusDocumentView()
{
    Page* page = m_frame->page();
    if (!page)
        return;
    page->focusController()->setFocusedFrame(m_frame);
}

bool EventHandler::passWidgetMouseDownEventToWidget(RenderWidget* renderWidget)
{
    return passMouseDownEventToWidget(renderWidget->widget());
}

unsigned EventHandler::accessKeyModifiers()
{
#if PLATFORM(DARWIN)
    return PlatformKeyboardEvent::CtrlKey | PlatformKeyboardEvent::AltKey;
#else
    return PlatformKeyboardEvent::AltKey;
#endif
}

} // namespace WebCore