I'm making a DataGridView with a series of Checkboxes in it with
the same labels horizontally and vertically.
Any labels that are
the same,
the checkboxes will be inactive, and I only want one of
the two "checks" for each combination to be valid.
The following screenshot shows what I have:
Anything that's checked on
the lower half, I want UN-checked on
the upper. So if [quux, spam] (or [7, 8] for zero-based co-ordinates) is checked, I want [spam, quux] ([8, 7]) un-checked. What I have so far is
the following:
dgvSysGrid.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders;
dgvSysGrid.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
string[] allsysNames = { "heya", "there", "lots", "of", "names", "foo", "bar", "quux", "spam", "eggs", "bacon" };
// Add a column for each entry, and a row for each entry, and mark
the "diagonals" as readonly
for (int i = 0; i < allsysNames.Length; i++)
{
dgvSysGrid.Columns.Add(new DataGridViewCheckBoxColumn(false));
dgvSysGrid.Columns[i].HeaderText = allsysNames[i];
dgvSysGrid.Rows.Add();
dgvSysGrid.Rows[i].HeaderCell.Value = allsysNames[i];
// Mark all of
the "diagonals" as unable to change
DataGridViewCell curDiagonal = dgvSysGrid[i, i];
curDiagonal.ReadOnly = true;
curDiagonal.Style.BackColor = Color.Black;
curDiagonal.Style.ForeColor = Color.Black;
}
// Hook up
the event handler so that we can change
the "corresponding" checkboxes as needed
//dgvSysGrid.CurrentCellDirtyStateChanged += new EventHandler(dgvSysGrid_CurrentCellDirtyStateChanged);
dgvSysGrid.CellValueChanged += new DataGridViewCellEventHandler(dgvSysGrid_CellValueChanged);
}
void dgvSysGrid_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
Point cur = new Point(e.ColumnIndex, e.RowIndex);
// Change
the diagonal checkbox to
the opposite state
DataGridViewCheckBoxCell curCell = (DataGridViewCheckBoxCell)dgvSysGrid[cur.X, cur.Y];
DataGridViewCheckBoxCell diagCell = (DataGridViewCheckBoxCell)dgvSysGrid[cur.Y, cur.X];
if ((bool)(curCell.Value) == true)
{
diagCell.Value = false;
}
else
{
diagCell.Value = true;
}
}
/// <summary>
/// Change
the corresponding checkbox to
the opposite state of
the current one
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void dgvSysGrid_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
Point cur = dgvSysGrid.CurrentCellAddress;
// Change
the diagonal checkbox to
the opposite state
DataGridViewCheckBoxCell curCell = (DataGridViewCheckBoxCell)dgvSysGrid[cur.X, cur.Y];
DataGridViewCheckBoxCell diagCell = (DataGridViewCheckBoxCell)dgvSysGrid[cur.Y, cur.X];
if ((bool)(curCell.Value) == true)
{
diagCell.Value = false;
}
else
{
diagCell.Value = true;
}
}
The problem comes is that
the cell value changed always seems to be "one behind" where you actually click if I use
the CellValueChanged event, and I'm not sure how to get
the current cell if I'm in
the "dirty" state as curCell comes in as a null (suggesting
the current cell address is wrong somehow, but I didn't try and get that value out) meaning that path isn't working at all.
Basically, how do I get
the "right" address with
the right boolean value so that my flipping algorithm will work?
