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How can I cause the highlight to redraw when skipping cells in a custom DataGridView?

Posted on 2009-05-10
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Last Modified: 2013-12-17
I have created a custom DataGridView component, and one of the added features is the ability to skip readonly columns.  I have implemented this by overriding the SetCurrentCellAddressCore method.

It works perfectly, except that the cell in the readonly column is painted blue whilst the newly selected cell gets the highlight border...  

How can I cause the newly selected cell to be highlighted and the readonly cell not?
protected override bool SetCurrentCellAddressCore(int columnIndex, int rowIndex, bool setAnchorCellAddress, bool validateCurrentCell, bool throughMouseClick)
        {
 
            if (columnIndex > -1 && rowIndex > -1 && skipReadOnlyColumns && 
                this.Rows[rowIndex].Cells[columnIndex].ReadOnly && !throughMouseClick)
            {
                int newColumnIndex = columnIndex + 1;
                int newRowIndex = rowIndex;
                if (newColumnIndex == this.Columns.Count)
                {
                    newColumnIndex = 0;
                    if (newRowIndex < this.Rows.Count - 1)
                        newRowIndex++;
                }
 
                return base.SetCurrentCellAddressCore(newColumnIndex, newRowIndex, setAnchorCellAddress, validateCurrentCell, throughMouseClick);
            }
            else
                return base.SetCurrentCellAddressCore(columnIndex, rowIndex, setAnchorCellAddress, validateCurrentCell, throughMouseClick);
        }

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Question by:chrisbray
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chrisbray earned 0 total points
ID: 24347921
The answer is to call SetSelectedCellCore:

                // Remove selection from current cell
                SetSelectedCellCore(columnIndex, rowIndex, false);
                // Change selection to new cell
                SetSelectedCellCore(newColumnIndex, newRowIndex, true);

The entire override which now supports backwards as well as forwards tabbing and mouse selection and copying of skipped cells is below in case anyone needs it.

Chris Bray

        protected override bool SetCurrentCellAddressCore(int columnIndex, int rowIndex, bool setAnchorCellAddress, bool validateCurrentCell, bool throughMouseClick)
        {
 
            if (columnIndex > -1 && rowIndex > -1 && skipReadOnlyColumns && 
                this.Rows[rowIndex].Cells[columnIndex].ReadOnly && !throughMouseClick)
            {
                int newColumnIndex;
                int newRowIndex;
                bool movingForward = this.CurrentCell.ColumnIndex < columnIndex;
 
                if (movingForward)
                {
                    newColumnIndex = columnIndex + 1;
                    newRowIndex = rowIndex;
                    if (newColumnIndex == this.Columns.Count)
                    {
                        newColumnIndex = 0;
                        if (newRowIndex < this.Rows.Count - 1)
                            newRowIndex++;
                    }
                }
                else
                { 
                    newColumnIndex = columnIndex - 1;
                    newRowIndex = rowIndex;
                    if (newColumnIndex == Columns.Count -1)
                    {
                        newColumnIndex = 0;
                        if (newRowIndex > 0)
                            newRowIndex--;
                    }
                }
                
                // Remove selection from current cell
                SetSelectedCellCore(columnIndex, rowIndex, false);
                // Change selection to new cell
                SetSelectedCellCore(newColumnIndex, newRowIndex, true);
                
                return base.SetCurrentCellAddressCore(newColumnIndex, newRowIndex, setAnchorCellAddress, validateCurrentCell, throughMouseClick);
            }
            else
                return base.SetCurrentCellAddressCore(columnIndex, rowIndex, setAnchorCellAddress, validateCurrentCell, throughMouseClick);
        }

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