1 /*

     2  * Copyright (C) 2009 Google Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions are

     6  * met:

     7  *

     8  *     * Redistributions of source code must retain the above copyright

     9  * notice, this list of conditions and the following disclaimer.

    10  *     * Redistributions in binary form must reproduce the above

    11  * copyright notice, this list of conditions and the following disclaimer

    12  * in the documentation and/or other materials provided with the

    13  * distribution.

    14  *     * Neither the name of Google Inc. nor the names of its

    15  * contributors may be used to endorse or promote products derived from

    16  * this software without specific prior written permission.

    17  *

    18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #include "config.h"

    32 #include "BackForwardListClientImpl.h"

    33 

    34 #include "HistoryItem.h"

    35 #include "WebViewClient.h"

    36 #include "WebViewImpl.h"

    37 

    38 using namespace WebCore;

    39 

    40 namespace WebKit {

    41 

    42 const char backForwardNavigationScheme[] = "chrome-back-forward";

    43 

    44 BackForwardListClientImpl::BackForwardListClientImpl(WebViewImpl* webView)

    45     : m_webView(webView)

    46 {

    47 }

    48 

    49 BackForwardListClientImpl::~BackForwardListClientImpl()

    50 {

    51 }

    52 

    53 void BackForwardListClientImpl::setCurrentHistoryItem(HistoryItem* item)

    54 {

    55     m_previousItem = m_currentItem;

    56     m_currentItem = item;

    57 }

    58 

    59 HistoryItem* BackForwardListClientImpl::previousHistoryItem() const

    60 {

    61     return m_previousItem.get();

    62 }

    63 

    64 void BackForwardListClientImpl::addItem(PassRefPtr<HistoryItem> item)

    65 {

    66     m_previousItem = m_currentItem;

    67     m_currentItem = item;

    68 

    69     // If WebCore adds a new HistoryItem, it means this is a new navigation (ie,

    70     // not a reload or back/forward).

    71     m_webView->observeNewNavigation();

    72 

    73     if (m_webView->client())

    74         m_webView->client()->didAddHistoryItem();

    75 }

    76 

    77 void BackForwardListClientImpl::goToItem(HistoryItem* item)

    78 {

    79     m_previousItem = m_currentItem;

    80     m_currentItem = item;

    81 

    82     if (m_pendingHistoryItem == item)

    83         m_pendingHistoryItem = 0;

    84 }

    85 

    86 HistoryItem* BackForwardListClientImpl::currentItem()

    87 {

    88     return m_currentItem.get();

    89 }

    90 

    91 HistoryItem* BackForwardListClientImpl::itemAtIndex(int index)

    92 {

    93     if (!m_webView->client() || index > forwardListCount() || -index > backListCount())

    94         return 0;

    95 

    96     // Since we don't keep the entire back/forward list, we have no way to

    97     // properly implement this method.  We return a dummy entry instead that we

    98     // intercept in our FrameLoaderClient implementation in case WebCore asks

    99     // to navigate to this HistoryItem.

   100 

   101     // FIXME: We should change WebCore to handle history.{back,forward,go}

   102     // differently.  It should perhaps just ask the FrameLoaderClient to

   103     // perform those navigations.

   104 

   105     String url_string = String::format(

   106         "%s://go/%d", backForwardNavigationScheme, index);

   107 

   108     m_pendingHistoryItem =

   109         HistoryItem::create(url_string, String(), 0.0);

   110     return m_pendingHistoryItem.get();

   111 }

   112 

   113 int BackForwardListClientImpl::backListCount()

   114 {

   115     if (!m_webView->client())

   116         return 0;

   117 

   118     return m_webView->client()->historyBackListCount();

   119 }

   120 

   121 int BackForwardListClientImpl::forwardListCount()

   122 {

   123     if (!m_webView->client())

   124         return 0;

   125 

   126     return m_webView->client()->historyForwardListCount();

   127 }

   128 

   129 void BackForwardListClientImpl::close()

   130 {

   131     m_currentItem = 0;

   132     m_previousItem = 0;

   133     m_pendingHistoryItem = 0;

   134 }

   135 

   136 } // namespace WebKit