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As an example of a more cell-oriented application, the download code includes an application called SimpleSpread This application mimics a simple spreadsheet and lets you do summations of the numeric values in a cell It uses a combination of selection mode and some event handling to give you a similar selection experience to most spreadsheetsspecifically, it acts like a combination of RowHeaderSelect and ColumnHeaderSelect, even though you can't achieve that through theSelectionMode property alone The
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SimpleSpread sample application is shown in Figure 610
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Figure 610 SimpleSpread Sample Application
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As you can see, the application lets you enter numbers into the cells; then you can select a sequence of cells and press the Sum button in the tool strip control at the top to get it to calculate the sum and place that in the next cell to the right or below the sequence of selections As Figure 610 shows, this application even supports selecting rectangular groups of cells, and it will compute the summation in both the row and column directions The logic is nowhere near complete to handle all combinations of selections and cell contents, but it gives you a good idea of how to set something like this up To code this up (as shown in Listing 66), I had to do a few things that are different from your average DataGridView application As I mentioned, I wanted to support a spreadsheet-like selection model, where you can select individual cells, but that selecting a column or row header would select the entire column or row, respectively To do this, I set the SelectionMode for the grid to RowHeaderSelect, turned off sorting for all the columns as I created them and added them to the grid, and then handled the ColumnHeaderMouseClick event to manually select all the cells in a column when the user clicks on a column header
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Listing 66 Spreadsheet-Oriented Grid Column Selection Support
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public partial class SimpleSpreadForm : Form { public SimpleSpreadForm() { InitializeComponent(); m_GridSelectionMode = DataGridViewSelectionModeRowHeaderSelect; }
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private void OnFormLoad(object sender, EventArgs e) { int start = (int)'A'; for (int i = 0; i < 26; i++) { string colName = ((char)(i + start))ToString(); int index = m_GridColumnsAdd(colName, colName); m_GridColumns[i]SortMode = DataGridViewColumnSortModeNotSortable; m_GridColumns[i]Width = 75; } for (int i = 0; i < 50; i++) { m_GridRowsAdd(); } } private void OnColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e) { m_GridClearSelection(); foreach (DataGridViewRow row in m_GridRows) { rowCells[eColumnIndex]Selected = true; } } }
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In this case, I just programmatically added some rows and columns to the grid, set the column headers to be the letters of the alphabet, and turned off sorting on the column by setting the SortMode property to NotSortable If you were going to support very large spreadsheets, you might need to maintain an in-memory sparse array, and only render the cells as you need them (which you could do with virtual mode) to avoid the overhead of maintaining a large number of cells, their contents, and their selections if the grid will be sparsely populated To get the row numbers to display in the row headers, I handled the RowAdded event and set the header cell value in that handler: private void OnRowAdded(object sender, DataGridViewRowsAddedEventArgs e) { m_GridRows[eRowIndex]HeaderCellValue = eRowIndexToString(); }
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Another selection mode you might want to support is to have hot cells, meaning that the selection of cells changes as you move the mouse around the grid without having to click To do this, you could just handle the CellMouseEnter and CellMouseLeave events, selecting and deselecting the cell under the mouse in those handlers, respectively
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