History.cpp 4.48 KB
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/*
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 * Copyright (C) 2007 Apple Inc.  All rights reserved.
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 *
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */

#include "config.h"
#include "History.h"

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#include "BackForwardController.h"
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#include "Document.h"
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#include "ExceptionCode.h"
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#include "Frame.h"
#include "FrameLoader.h"
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#include "FrameLoaderClient.h"
#include "HistoryItem.h"
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#include "Page.h"
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#include "SecurityOrigin.h"
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#include "SerializedScriptValue.h"
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#include <wtf/MainThread.h>
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namespace WebCore {

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History::History(Frame* frame)
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    : DOMWindowProperty(frame)
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    , m_lastStateObjectRequested(0)
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{
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}
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unsigned History::length() const
{
    if (!m_frame)
        return 0;
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    if (!m_frame->page())
        return 0;
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    return m_frame->page()->backForward()->count();
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}

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SerializedScriptValue* History::state()
{
    m_lastStateObjectRequested = stateInternal();
    return m_lastStateObjectRequested;
}

SerializedScriptValue* History::stateInternal() const
{
    if (!m_frame)
        return 0;

    if (HistoryItem* historyItem = m_frame->loader()->history()->currentItem())
        return historyItem->stateObject();

    return 0;
}

bool History::stateChanged() const
{
    return m_lastStateObjectRequested != stateInternal();
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}

bool History::isSameAsCurrentState(SerializedScriptValue* state) const
{
    return state == stateInternal();
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}

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void History::back()
{
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    go(-1);
}

void History::back(ScriptExecutionContext* context)
{
    go(context, -1);
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}

void History::forward()
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{
    go(1);
}

void History::forward(ScriptExecutionContext* context)
{
    go(context, 1);
}

void History::go(int distance)
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{
    if (!m_frame)
        return;
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    m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
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}

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void History::go(ScriptExecutionContext* context, int distance)
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{
    if (!m_frame)
        return;
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    ASSERT(isMainThread());
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    Frame* activeFrame = static_cast<Document*>(context)->frame();
    if (!activeFrame)
        return;

    if (!activeFrame->loader()->shouldAllowNavigation(m_frame))
        return;

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    m_frame->navigationScheduler()->scheduleHistoryNavigation(distance);
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}

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KURL History::urlForState(const String& urlString)
{
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    KURL baseURL = m_frame->document()->baseURL();
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    if (urlString.isEmpty())
        return baseURL;
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    return KURL(baseURL, urlString);
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}

void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& title, const String& urlString, StateObjectType stateObjectType, ExceptionCode& ec)
{
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    if (!m_frame || !m_frame->page())
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        return;
    
    KURL fullURL = urlForState(urlString);
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    if (!fullURL.isValid() || !m_frame->document()->securityOrigin()->canRequest(fullURL)) {
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        ec = SECURITY_ERR;
        return;
    }

    if (stateObjectType == StateObjectPush)
        m_frame->loader()->history()->pushState(data, title, fullURL.string());
    else if (stateObjectType == StateObjectReplace)
        m_frame->loader()->history()->replaceState(data, title, fullURL.string());
            
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    if (!urlString.isEmpty())
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        m_frame->document()->updateURLForPushOrReplaceState(fullURL);
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    if (stateObjectType == StateObjectPush)
        m_frame->loader()->client()->dispatchDidPushStateWithinPage();
    else if (stateObjectType == StateObjectReplace)
        m_frame->loader()->client()->dispatchDidReplaceStateWithinPage();
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}

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} // namespace WebCore