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      1 /*
      2  * Copyright (C) 2010 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/history/BackForwardController.h"
     28 
     29 #include "core/history/BackForwardClient.h"
     30 #include "core/history/HistoryItem.h"
     31 #include "core/page/Page.h"
     32 
     33 namespace WebCore {
     34 
     35 BackForwardController::BackForwardController(Page* page, BackForwardClient* client)
     36     : m_page(page)
     37     , m_client(client)
     38 {
     39     ASSERT(m_client);
     40 }
     41 
     42 BackForwardController::~BackForwardController()
     43 {
     44 }
     45 
     46 PassOwnPtr<BackForwardController> BackForwardController::create(Page* page, BackForwardClient* client)
     47 {
     48     return adoptPtr(new BackForwardController(page, client));
     49 }
     50 
     51 void BackForwardController::goBackOrForward(int distance)
     52 {
     53     if (distance == 0)
     54         return;
     55 
     56     HistoryItem* item = itemAtIndex(distance);
     57     if (!item) {
     58         if (distance > 0) {
     59             if (forwardCount())
     60                 item = itemAtIndex(forwardCount());
     61         } else {
     62             if (backCount())
     63                 item = itemAtIndex(-backCount());
     64         }
     65     }
     66 
     67     if (!item)
     68         return;
     69 
     70     m_page->goToItem(item);
     71 }
     72 
     73 bool BackForwardController::goBack()
     74 {
     75     HistoryItem* item = backItem();
     76 
     77     if (item) {
     78         m_page->goToItem(item);
     79         return true;
     80     }
     81     return false;
     82 }
     83 
     84 bool BackForwardController::goForward()
     85 {
     86     HistoryItem* item = forwardItem();
     87 
     88     if (item) {
     89         m_page->goToItem(item);
     90         return true;
     91     }
     92     return false;
     93 }
     94 
     95 void BackForwardController::addItem(PassRefPtr<HistoryItem> item)
     96 {
     97     m_client->addItem(item);
     98 }
     99 
    100 void BackForwardController::setCurrentItem(HistoryItem* item)
    101 {
    102     m_client->goToItem(item);
    103 }
    104 
    105 int BackForwardController::count() const
    106 {
    107     return backCount() + 1 + forwardCount();
    108 }
    109 
    110 int BackForwardController::backCount() const
    111 {
    112     return m_client->backListCount();
    113 }
    114 
    115 int BackForwardController::forwardCount() const
    116 {
    117     return m_client->forwardListCount();
    118 }
    119 
    120 HistoryItem* BackForwardController::itemAtIndex(int i)
    121 {
    122     return m_client->itemAtIndex(i);
    123 }
    124 
    125 bool BackForwardController::isActive()
    126 {
    127     return m_client->isActive();
    128 }
    129 
    130 void BackForwardController::close()
    131 {
    132     m_client->close();
    133 }
    134 
    135 } // namespace WebCore
    136