59 lines
1,006 B
C
59 lines
1,006 B
C
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#ifndef HISTORY_H
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#define HISTORY_H
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#include <QList>
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template <typename T>
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class History {
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public:
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History() { }
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T back() {
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if (head > 0) {
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return history.at(--head);
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}
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return NULL;
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}
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T next() {
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if (head + 1 < history.length()) {
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return history.at(++head);
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}
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return NULL;
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}
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void push(T commit) {
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while (head + 1 < history.length()) {
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T item = history.last();
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history.removeLast();
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delete item;
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}
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if (saved > head) {
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saved = -1;
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}
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history.append(commit);
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head++;
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}
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T current() {
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if (head < 0 || history.length() == 0) {
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return NULL;
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}
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return history.at(head);
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}
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void save() {
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saved = head;
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}
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bool isSaved() {
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return saved == head;
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}
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private:
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QList<T> history;
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int head = -1;
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int saved = -1;
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};
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#endif // HISTORY_H
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