private void updateCellValue(Cell c, string name)
{
string content = c.getContent(); //get content of cell
string preValue = c.getValue(); //get current value of cell
c.setPreValue(value); //set previous value of cell to current value
int rowIndex = getRowIndexByName(name); //get row index of cell
int columnIndex = getColumnIndexByName(name); //get column index of cell
List <string> list = new List <string>();
if (content != null && content != "")
{
expTree = new ExpTree(content.Substring(1));
list = expTree.parseVariables(content.Substring(1)); //get list of variables
string n = getCellName(rowIndex, columnIndex); //get name of current cell
//addDependencies(n, list); //add to dependencies dictionary
string val;
foreach (string var in list)
{
val = getCellByName(var).getValue(); //get numerical value of cell
expTree.addToDictionary(var, val); //add variable name and value to expression tree dictionary
}
if (expTree.getDictionarySize() > 0) //variables exist in the tree
{
expTree.resetTree(content.Substring(1)); //put variable values in tree
}
string value = expTree.Eval().ToString(); //get value of expression and convert it to string
spreadsheet[rowIndex, columnIndex].setValue(value, true); //set value of cell to new value
}
else
{
spreadsheet[rowIndex, columnIndex].setValue("", true);
}
rowChanged = rowIndex; //save the row number that was changed
columnChanged = columnIndex; //save the column number that was changed
OnPropertyChanged("content"); //fire property changed event to update UI
}
private void CellPropertyChanged(object sender, PropertyChangedEventArgs e) //cell property changed event
{
int rowIndex = 0, columnIndex = 0;
bool found = false;
//determine which cell threw the event
for (int i = 0; i < rowCount; i++)
{
for (int j = 0; j < columnCount; j++)
{
if (sender.Equals(spreadsheet[i, j])) //check if current cell is the one that sent the event
{
found = true;
rowIndex = i; //save row index of sender
columnIndex = j; //save column index of sender
break; //break out of loop
}
}
}
if ("content" == e.PropertyName)
{
if (found == true) //only proceed if sender was identified
{
bool error = false;
string content = spreadsheet[rowIndex, columnIndex].getContent(); //get content string
if (content != null && content != "")
{
if (content.StartsWith("=")) //value needs to be updated
{
List <string> list = new List <string>();
expTree = new ExpTree(content.Substring(1));
list = expTree.parseVariables(content.Substring(1)); //get list of variables
if (checkVariablesExist(list)) //only execute following code if all variables exist in the spreadsheet
{
if (checkSelfReference(list, rowIndex, columnIndex)) //only execute following code if there aren't any self references in the formula
{
visited.Add(getCell(rowIndex, columnIndex)); //add starting cell to visited hash set
string n = getCellName(rowIndex, columnIndex); //get name of current cell
removeDependencies(n); //remove old dependencies before adding new ones
addDependencies(n, list); //add to dependencies dictionary
if (checkCircularReference(getCellName(rowIndex, columnIndex))) //only execute following code if there aren't any circular references in the formula
{
string val;
foreach (string var in list)
{
val = getCellByName(var).getValue(); //get numerical value of cell
expTree.addToDictionary(var, val); //add variable name and value to expression tree dictionary
}
if (expTree.getDictionarySize() > 0) //variables exist in the tree
{
expTree.resetTree(content.Substring(1)); //put variable values in tree
}
string value = expTree.Eval().ToString(); //get value of expression and convert it to string
spreadsheet[rowIndex, columnIndex].setValue(value, false); //set value of cell to new value
}
else //expression in cell contained a circular reference
{
spreadsheet[rowIndex, columnIndex].setValue("!(circular reference)", false); //set value of cell to error message
error = true;
//visited.Clear(); //clear visited hash set for the next expression
}
}
else //expression in cell contained a self reference
{
spreadsheet[rowIndex, columnIndex].setValue("!(self reference)", false); //set value of cell to error message
error = true;
}
}
else //expression in cell contained an invalid cell name
{
spreadsheet[rowIndex, columnIndex].setValue("!(bad reference)", false); //set value of cell to error message
error = true;
}
}
else //value is the same as content
{
string n = getCellName(rowIndex, columnIndex); //get cell name
removeDependencies(n); //remove dependencies since cell is now just a constant value and doesn't reference any cells
spreadsheet[rowIndex, columnIndex].setValue(content, false); //set value of cell to content of cell
}
}
else
{
spreadsheet[rowIndex, columnIndex].setValue("", false);
}
bool success = false;
string name = getCellName(rowIndex, columnIndex); //get name of current cell
if (error == false) //only update dependencies if there is not an error
{
//visited.Add(getCellByName(name)); //add starting cell to visited hash set
success = updateDependencies(name); //update dependencies of current cell, returns false if there is a circular dependency
//if(success == false) //there was a circular dependency in the expression
//{
// spreadsheet[rowIndex, columnIndex].setValue("!(circular reference)", false); //set value of cell to error message
// setPreValues(getCellByName(name)); //make sure values of dependent cells don't change
//}
}
visited.Clear(); //clear hash set for next expression
rowChanged = rowIndex; //save the row number that was changed
columnChanged = columnIndex; //save the column number that was changed
OnPropertyChanged("content"); //fire PropertyChanged event
}
}
else if ("value" == e.PropertyName)
{
rowChanged = rowIndex;
columnChanged = columnIndex;
OnPropertyChanged("content"); //fire PropertyChanged event
}
else if ("BGColor" == e.PropertyName)
{
rowChanged = rowIndex;
columnChanged = columnIndex;
OnPropertyChanged("BGColor"); //fire PropertyChanged event
}
}