KDE 3.5 API Reference kviewshell
history.cpp
Go to the documentation of this file.00001 // history.cpp 00002 // 00003 // (C) 2001 Stefan Kebekus 00004 // Distributed under the GPL 00005 00006 #include <config.h> 00007 00008 #include <kdebug.h> 00009 00010 #include "history.h" 00011 00012 HistoryItem::HistoryItem(Q_UINT32 p, Q_UINT32 y) 00013 : page(p), ypos(y) 00014 { 00015 } 00016 00017 bool HistoryItem::operator== (const HistoryItem& item) const 00018 { 00019 return page == item.page && ypos == item.ypos; 00020 } 00021 00022 History::History() 00023 { 00024 } 00025 00026 void History::add(Q_UINT32 page, Q_UINT32 ypos) 00027 { 00028 HistoryItem item(page, ypos); 00029 00030 if (historyList.empty()) 00031 { 00032 currentItem = historyList.append(item); 00033 } 00034 else 00035 { 00036 // Don't add the same item several times in a row 00037 if (item == *currentItem) 00038 return; 00039 00040 currentItem++; 00041 if (currentItem == historyList.end()) 00042 { 00043 currentItem = historyList.append(item); 00044 } 00045 else 00046 { 00047 currentItem = historyList.insert(currentItem, item); 00048 } 00049 // Delete items starting after currentItem to the end of the list. 00050 QValueList<HistoryItem>::iterator deleteItemsStart = currentItem; 00051 deleteItemsStart++; 00052 historyList.erase(deleteItemsStart, historyList.end()); 00053 00054 if (historyList.size() > HISTORYLENGTH) 00055 historyList.pop_front(); 00056 } 00057 emit backItem(currentItem != historyList.begin()); 00058 emit forwardItem(false); 00059 } 00060 00061 HistoryItem* History::forward() 00062 { 00063 if (historyList.empty() || currentItem == historyList.fromLast()) 00064 return 0; 00065 00066 currentItem++; 00067 emit backItem(true); 00068 emit forwardItem(currentItem != historyList.fromLast()); 00069 return &(*currentItem); 00070 } 00071 00072 HistoryItem* History::back() 00073 { 00074 if (historyList.empty() || currentItem == historyList.begin()) 00075 return 0; 00076 00077 currentItem--; 00078 emit backItem(currentItem != historyList.begin()); 00079 emit forwardItem(true); 00080 return &(*currentItem); 00081 } 00082 00083 void History::clear() 00084 { 00085 historyList.clear(); 00086 currentItem = historyList.begin(); 00087 emit backItem(false); 00088 emit forwardItem(false); 00089 } 00090 00091 #include "history.moc"
