Решил поделиться своей реализацией функционала Отмена/Повтор для
приложения, использующего несколько QTableWidget-ов.
undoredotable.h
#ifndef UNDOREDOTABLE_H
#define UNDOREDOTABLE_H
#include <QVector>
#include <QString>
#include <QTableWidget>
class UndoRedoTable {
public:
UndoRedoTable(QTableWidget *);
virtual ~UndoRedoTable();
void saveState();
void undoTable();
void redoTable();
ptrdiff_t undoTableNumber() const;
ptrdiff_t redoTableNumber() const;
void freeMemory();
private:
QTableWidget *table;
QVector< QVector< QVector<QString> > > data;
ptrdiff_t position;
};
#endif /* UNDOREDOTABLE_H */
undoredotable.cpp
#include "undoredotable.h"
#include "tablewidgetfunctions.h"
#include <QVector>
#include <QString>
#include <QTableWidget>
UndoRedoTable::UndoRedoTable(QTableWidget *tbl) :
position(-1) {
table = tbl;
}
UndoRedoTable::~UndoRedoTable() {
}
void UndoRedoTable::saveState() {
if ( (data.count() - position) > 1 ) {
for ( ptrdiff_t i=(data.count()-1); i>position; i-- ) {
data.remove(i);
}
}
QVector<QString> row;
QVector< QVector<QString> > matrix;
for ( ptrdiff_t i=0; i<table->rowCount(); i++ ) {
for ( ptrdiff_t j=0; j<table->columnCount(); j++ ) {
row.push_back(table->item(i, j)->text());
}
matrix.push_back(row);
row.clear();
}
data.push_back(matrix);
matrix.clear();
position++;
}
void UndoRedoTable::undoTable() {
position--;
if ( table->rowCount() < data[position].count() ) {
addRows(table, data[position].count());
}
else if ( table->rowCount() > data[position].count() ) {
table->setRowCount(data[position].count());
}
for ( ptrdiff_t i=0; i<data[position].count(); i++ ) {
for ( ptrdiff_t j=0; j<data[position][i].count(); j++ ) {
table->item(i, j)->setText(data[position][i][j]);
}
}
}
void UndoRedoTable::redoTable() {
position++;
position++;
undoTable();
}
ptrdiff_t UndoRedoTable::undoTableNumber() const {
return position;
}
ptrdiff_t UndoRedoTable::redoTableNumber() const {
return data.count() - position - 1;
}
void UndoRedoTable::freeMemory() {
data.clear();
}
