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      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 "BackForwardListChromium.h"
     33 
     34 #include "HistoryItem.h"
     35 #include "WebViewClient.h"
     36 #include "WebViewImpl.h"
     37 #include <wtf/text/StringConcatenate.h>
     38 
     39 using namespace WebCore;
     40 
     41 namespace WebKit {
     42 
     43 const char backForwardNavigationScheme[] = "chrome-back-forward";
     44 
     45 PassRefPtr<BackForwardListChromium> BackForwardListChromium::create(WebViewImpl* webView)
     46 {
     47     return adoptRef(new BackForwardListChromium(webView));
     48 }
     49 
     50 BackForwardListChromium::BackForwardListChromium(WebViewImpl* webView)
     51     : m_webView(webView)
     52 {
     53 }
     54 
     55 BackForwardListChromium::~BackForwardListChromium()
     56 {
     57 }
     58 
     59 void BackForwardListChromium::addItem(PassRefPtr<HistoryItem> item)
     60 {
     61     m_currentItem = item;
     62 
     63     // If WebCore adds a new HistoryItem, it means this is a new navigation (ie,
     64     // not a reload or back/forward).
     65     m_webView->observeNewNavigation();
     66 
     67     if (m_webView->client())
     68         m_webView->client()->didAddHistoryItem();
     69 }
     70 
     71 void BackForwardListChromium::goToItem(HistoryItem* item)
     72 {
     73     m_currentItem = item;
     74 
     75     if (m_pendingHistoryItem == item)
     76         m_pendingHistoryItem = 0;
     77 }
     78 
     79 HistoryItem* BackForwardListChromium::itemAtIndex(int index)
     80 {
     81     if (!m_webView->client())
     82         return 0;
     83 
     84     if (!index)
     85         return m_currentItem.get();
     86 
     87     if (index > forwardListCount() || -index > backListCount())
     88         return 0;
     89 
     90     // Since we don't keep the entire back/forward list, we have no way to
     91     // properly implement this method.  We return a dummy entry instead that we
     92     // intercept in our FrameLoaderClient implementation in case WebCore asks
     93     // to navigate to this HistoryItem.
     94 
     95     // FIXME: We should change WebCore to handle history.{back,forward,go}
     96     // differently.  It should perhaps just ask the FrameLoaderClient to
     97     // perform those navigations.
     98 
     99     String urlString = makeString(backForwardNavigationScheme, "://go/", String::number(index));
    100     m_pendingHistoryItem = HistoryItem::create(urlString, String(), 0);
    101     return m_pendingHistoryItem.get();
    102 }
    103 
    104 int BackForwardListChromium::backListCount()
    105 {
    106     if (!m_webView->client())
    107         return 0;
    108 
    109     return m_webView->client()->historyBackListCount();
    110 }
    111 
    112 int BackForwardListChromium::forwardListCount()
    113 {
    114     if (!m_webView->client())
    115         return 0;
    116 
    117     return m_webView->client()->historyForwardListCount();
    118 }
    119 
    120 bool BackForwardListChromium::isActive()
    121 {
    122     return m_webView->client();
    123 }
    124 
    125 void BackForwardListChromium::close()
    126 {
    127     m_currentItem = 0;
    128     m_pendingHistoryItem = 0;
    129 }
    130 
    131 } // namespace WebKit
    132