/// <summary>
/// Find or create a grid cell.
/// cell.IsEditing is true on F2 and mouse click.
/// </summary>
/// <param name="cell"></param>
/// <param name="dataItem"></param>
/// <returns></returns>
protected override FrameworkElement GenerateElement(DataGridCell cell, object dataItem)
{
var content = new ContentControl();
IGridCellVM context = GridMappingCells.FindOrCreate(cell.Column.Header, dataItem);
var binding = new Binding()
{
Source = context
};
// cell edition mode ? on a textBox by F2 or mouse click
if (cell.IsEditing)
{
// only for text box (not for checkbox!)
if (context is GridCellValueVM)
{
content.ContentTemplate = CellEditingTemplate;
}
else
{
content.ContentTemplate = CellTemplate;
}
}
else
{
content.ContentTemplate = CellTemplate;
}
content.SetBinding(ContentControl.ContentProperty, binding);
return(content);
}
/// <summary>
/// refresh a cell, by the col and row.
/// (called because of a row relation: update the linked cell.
/// </summary>
/// <param name="columnVM"></param>
/// <param name="rowVM"></param>
public void RefreshCell(IGridColumnVM columnVM, IGridRowVM rowVM)
{
IGridCellVM value = this.Where(x => x.RowBinding == rowVM && x.ColumnBinding == columnVM).FirstOrDefault();
if (value == null)
{
return;
}
value.Refresh();
}
/// <summary>
/// Find or create the cell view model corresponding to the row and the column.
/// </summary>
/// <param name="columnBinding"></param>
/// <param name="rowBinding"></param>
/// <returns></returns>
public override IGridCellVM FindOrCreate(object columnBinding, object rowBinding)
{
// try to find it
IGridCellVM value = this.Where(x => x.RowBinding == rowBinding &&
x.ColumnBinding == columnBinding).FirstOrDefault();
if (value != null)
{
return(value);
}
// the value does not exists, create it
return(Create(columnBinding as IGridColumnVM, rowBinding as IGridRowVM));
}
//=====================================================================
#region Privates methods.
/// <summary>
/// Create a mapped value of a cell, between a col and a row.
/// </summary>
/// <param name="columnBinding"></param>
/// <param name="rowBinding"></param>
/// <returns></returns>
private IGridCellVM Create(IGridColumnVM columnBinding, IGridRowVM rowBinding)
{
// find the cell in the row, by the column
IGridCell cell = rowBinding.GridRow.FindCellByColumn(columnBinding.GridColumn);
if (cell == null)
{
throw new Exception("The cell is not found in the dataGrid!");
}
// create the cellVM, can be a value or a component (button, combobox,...)
IGridCellVM mapValue = _gridFactory.CreateCellVM(cell);
mapValue.ColumnBinding = columnBinding;
mapValue.RowBinding = rowBinding;
Add(mapValue);
return(mapValue);
}
