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92 lines
1.8 KiB
92 lines
1.8 KiB
// history.cpp
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//
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// (C) 2001 Stefan Kebekus
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// Distributed under the GPL
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#include <config.h>
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#include <kdebug.h>
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#include "history.h"
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HistoryItem::HistoryItem(TQ_UINT32 p, TQ_UINT32 y)
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: page(p), ypos(y)
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{
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}
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bool HistoryItem::operator== (const HistoryItem& item) const
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{
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return page == item.page && ypos == item.ypos;
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}
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History::History()
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{
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}
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void History::add(TQ_UINT32 page, TQ_UINT32 ypos)
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{
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HistoryItem item(page, ypos);
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if (historyList.empty())
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{
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currentItem = historyList.append(item);
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}
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else
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{
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// Don't add the same item several times in a row
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if (item == *currentItem)
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return;
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currentItem++;
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if (currentItem == historyList.end())
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{
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currentItem = historyList.append(item);
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}
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else
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{
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currentItem = historyList.insert(currentItem, item);
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}
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// Delete items starting after currentItem to the end of the list.
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TQValueList<HistoryItem>::iterator deleteItemsStart = currentItem;
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deleteItemsStart++;
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historyList.erase(deleteItemsStart, historyList.end());
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if (historyList.size() > HISTORYLENGTH)
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historyList.pop_front();
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}
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emit backItem(currentItem != historyList.begin());
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emit forwardItem(false);
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}
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HistoryItem* History::forward()
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{
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if (historyList.empty() || currentItem == historyList.fromLast())
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return 0;
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currentItem++;
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emit backItem(true);
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emit forwardItem(currentItem != historyList.fromLast());
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return &(*currentItem);
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}
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HistoryItem* History::back()
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{
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if (historyList.empty() || currentItem == historyList.begin())
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return 0;
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currentItem--;
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emit backItem(currentItem != historyList.begin());
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emit forwardItem(true);
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return &(*currentItem);
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}
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void History::clear()
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{
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historyList.clear();
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currentItem = historyList.begin();
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emit backItem(false);
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emit forwardItem(false);
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}
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#include "history.moc"
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