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    16 ** GNU Lesser General Public License Usage

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    40 ****************************************************************************/

    41 

    42 #include "spreadsheetitem.h"

    43 

    44 SpreadSheetItem::SpreadSheetItem()

    45         : QTableWidgetItem(), isResolving(false)

    46 {

    47 }

    48 

    49 SpreadSheetItem::SpreadSheetItem(const QString &text)

    50         : QTableWidgetItem(text), isResolving(false)

    51 {

    52 }

    53 

    54 QTableWidgetItem *SpreadSheetItem::clone() const

    55 {

    56     SpreadSheetItem *item = new SpreadSheetItem();

    57     *item = *this;

    58     return item;

    59 }

    60 

    61 QVariant SpreadSheetItem::data(int role) const

    62 {

    63     if (role == Qt::EditRole || role == Qt::StatusTipRole)

    64         return formula();

    65 

    66     if (role == Qt::DisplayRole)

    67         return display();

    68 

    69     QString t = display().toString();

    70     bool isNumber = false;

    71     int number = t.toInt(&isNumber);

    72 

    73     if (role == Qt::TextColorRole) {

    74         if (!isNumber)

    75             return qVariantFromValue(QColor(Qt::black));

    76         else if (number < 0)

    77             return qVariantFromValue(QColor(Qt::red));

    78         return qVariantFromValue(QColor(Qt::blue));

    79     }

    80 

    81      if (role == Qt::TextAlignmentRole)

    82          if (!t.isEmpty() && (t.at(0).isNumber() || t.at(0) == '-'))

    83              return (int)(Qt::AlignRight | Qt::AlignVCenter);

    84 

    85      return QTableWidgetItem::data(role);

    86  }

    87 

    88 void SpreadSheetItem::setData(int role, const QVariant &value)

    89 {

    90     QTableWidgetItem::setData(role, value);

    91     if (tableWidget())

    92         tableWidget()->viewport()->update();

    93 }

    94 

    95 QVariant SpreadSheetItem::display() const

    96 {

    97     // avoid circular dependencies

    98     if (isResolving)

    99         return QVariant();

   100 

   101     isResolving = true;

   102     QVariant result = computeFormula(formula(), tableWidget(), this);

   103     isResolving = false;

   104     return result;

   105 }

   106 

   107 QVariant SpreadSheetItem::computeFormula(const QString &formula,

   108                                          const QTableWidget *widget,

   109                                          const QTableWidgetItem *self)

   110 {

   111     // check if the s tring is actually a formula or not

   112     QStringList list = formula.split(' ');

   113     if (list.isEmpty() || !widget)

   114         return formula; // it is a normal string

   115 

   116     QString op = list.value(0).toLower();

   117 

   118     int firstRow = -1;

   119     int firstCol = -1;

   120     int secondRow = -1;

   121     int secondCol = -1;

   122 

   123     if (list.count() > 1)

   124         decode_pos(list.value(1), &firstRow, &firstCol);

   125 

   126     if (list.count() > 2)

   127         decode_pos(list.value(2), &secondRow, &secondCol);

   128 

   129     const QTableWidgetItem *start = widget->item(firstRow, firstCol);

   130     const QTableWidgetItem *end = widget->item(secondRow, secondCol);

   131 

   132     int firstVal = start ? start->text().toInt() : 0;

   133     int secondVal = end ? end->text().toInt() : 0;

   134 

   135     QVariant result;

   136     if (op == "sum") {

   137         int sum = 0;

   138         for (int r = firstRow; r <= secondRow; ++r) {

   139             for (int c = firstCol; c <= secondCol; ++c) {

   140                 const QTableWidgetItem *tableItem = widget->item(r, c);

   141                 if (tableItem && tableItem != self)

   142                     sum += tableItem->text().toInt();

   143             }

   144         }

   145 

   146         result = sum;

   147     } else if (op == "+") {

   148         result = (firstVal + secondVal);

   149     } else if (op == "-") {

   150         result = (firstVal - secondVal);

   151     } else if (op == "*") {

   152         result = (firstVal * secondVal);

   153     } else if (op == "/") {

   154         if (secondVal == 0)

   155             result = QString("nan");

   156         else

   157             result = (firstVal / secondVal);

   158     } else if (op == "=") {

   159         if (start)

   160             result = start->text();

   161     } else {

   162         result = formula;

   163     }

   164 

   165     return result;

   166 }

   167