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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 "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
    137