public bool SetFocusOnSelectedRow(object selected, string columnHeader)
{
if ((this.ParentMenu != null && this.ParentMenu.IsOpen) ||
(this.ContextMenu != null && this.ContextMenu.IsOpen))
{
// fix bug where context menu disappears when you right click on a new item.
return(false);
}
// the focus this row so that user can continue using keyboard navigation
DataGridRow row = this.ItemContainerGenerator.ContainerFromItem(selected) as DataGridRow;
if (row != null)
{
int columnToFocus = GetColumnIndexByTemplateHeader(columnHeader);
if (columnToFocus < 0)
{
return(false);
}
DataGridCellInfo dgci = this.SelectedCells[columnToFocus];
if (dgci != null)
{
int rowIndex = row.GetIndex();
int colIndex = GetColIndex(dgci);
row.ApplyTemplate();
DataGridCell dgc = GetCell(rowIndex, colIndex);
if (dgc != null)
{
dgc.Focus();
return(true);
}
}
}
return(false);
}
private DataGridCell GetCell(DataGridRow rowContainer, int column)
{
if (rowContainer != null)
{
DataGridCellsPresenter presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
/* if the row has been virtualized away, call its ApplyTemplate() method
* to build its visual tree in order for the DataGridCellsPresenter
* and the DataGridCells to be created */
rowContainer.ApplyTemplate();
presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
}
if (presenter != null)
{
DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
if (cell == null)
{
/* bring the column into view
* in case it has been virtualized away */
ScrollIntoView(rowContainer, Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
}
return(null);
}
static DataGridCell GetCell(DataGrid dataGrid, DataGridRow row, int column)
{
if (dataGrid == null)
{
throw new ArgumentNullException(nameof(dataGrid));
}
if (row == null)
{
throw new ArgumentNullException(nameof(row));
}
if (column < 0)
{
throw new ArgumentOutOfRangeException(nameof(column));
}
DataGridCellsPresenter presenter = FindVisualChild <DataGridCellsPresenter>(row);
if (presenter == null)
{
row.ApplyTemplate();
presenter = FindVisualChild <DataGridCellsPresenter>(row);
}
if (presenter != null)
{
var cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
if (cell == null)
{
dataGrid.ScrollIntoView(row, dataGrid.Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
return(null);
}
public static void SetFocusOnNewCreatedColumn(DataGrid DataGrid, int rowIndex)
{
DataGrid.Focus();
DataGridRow rowContainer = DataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
if (rowContainer == null)
{
DataGrid.SelectedIndex = rowIndex;
DataGrid.ScrollIntoView(DataGrid.SelectedItem);
rowContainer = DataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
}
if (rowContainer != null)
{
rowContainer.ApplyTemplate();
DataGridCellsPresenter presenter = WpfTools.FindVisualChild <DataGridCellsPresenter>(rowContainer);
DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(0) as DataGridCell;
if (cell == null)
{
/* bring the column into view in case it has been virtualized away */
DataGrid.ScrollIntoView(rowContainer, DataGrid.Columns[0]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(0) as DataGridCell;
}
if (cell != null)
{
cell.Focus();
}
}
}
/// <summary>
/// Get the cell and its data for decision making
/// </summary>
public static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
{
if (rowContainer != null)
{
//get the childern of the visual presenter
DataGridCellsPresenter presenter = GetVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
rowContainer.ApplyTemplate();
presenter = GetVisualChild <DataGridCellsPresenter>(rowContainer);
}
if (presenter != null)
{
//get the findal cell object
DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
//if the cell object is null refresh grid and get the current cell object
if (cell == null)
{
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
dataGrid.UpdateLayout();
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
}
return(null);
}
public static DataGridCell GetCell(this DataGrid source, int row, int column)
{
DataGridRow rowContainer = GetRow(source, row);
if (rowContainer != null)
{
DataGridCellsPresenter presenter = GetVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
rowContainer.ApplyTemplate();
presenter = GetVisualChild <DataGridCellsPresenter>(rowContainer);
}
if (presenter == null)
{
return(null);
}
DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
if (cell == null)
{
source.ScrollIntoView(rowContainer, source.Columns[column]);
cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
}
return(cell);
}
return(null);
}
public bool SetFocusOnSelectedRow(object selected, string columnHeader)
{
// the focus this row so that user can continue using keyboard navigation
DataGridRow row = this.ItemContainerGenerator.ContainerFromItem(selected) as DataGridRow;
if (row != null)
{
int columnToFocus = GetColumnIndexByTemplateHeader(columnHeader);
if (columnToFocus < 0)
{
return(false);
}
DataGridCellInfo dgci = this.SelectedCells[columnToFocus];
if (dgci != null)
{
int rowIndex = row.GetIndex();
int colIndex = GetColIndex(dgci);
row.ApplyTemplate();
DataGridCell dgc = GetCell(rowIndex, colIndex);
if (dgc != null)
{
dgc.Focus();
return(true);
}
}
}
return(false);
}
private static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
{
var presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
// If the row has been virtualized away, call its ApplyTemplate() method
// to build its visual tree in order for the DataGridCellsPresenter
// and the DataGridCells to be created
rowContainer.ApplyTemplate();
presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
return(null);
}
}
if (presenter.ItemContainerGenerator.ContainerFromIndex(column) is not DataGridCell cell)
{
// Bring the column into view in case it has been virtualized away
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
public static DataGridCell GetCellByItem(DataGrid grid, object item, int column)
{
DataGridCell result = null;
if (item != null && grid != null)
{
DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(item);
if (row == null)
{
grid.UpdateLayout();
grid.SelectedItem = item;
grid.ScrollIntoView(item);
row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(item);
}
if (row != null)
{
DataGridCellsPresenter cellPresenter = UISearch.FindVisualChild <DataGridCellsPresenter>(row);
if (cellPresenter == null)
{
row.ApplyTemplate();
cellPresenter = UISearch.FindVisualChild <DataGridCellsPresenter>(row);
}
if (cellPresenter != null)
{
DataGridCell cell = cellPresenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
if (cell == null)
{
grid.ScrollIntoView(row, grid.Columns[0]);
cell = cellPresenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
if (cell != null)
{
result = cell;
}
}
}
}
return(result);
}
public static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
{
if (rowContainer != null)
{
DataGridCellsPresenter presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
if (presenter == null)
{
rowContainer.ApplyTemplate();
presenter = FindVisualChild <DataGridCellsPresenter>(rowContainer);
}
if (presenter != null)
{
DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
if (cell == null)
{
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
}
return(null);
}
/// <summary>
/// 指定した行、列のセルを取得
/// </summary>
/// <param name="grid">取得対象DataGrid</param>
/// <param name="row">行</param>
/// <param name="column">列番号</param>
/// <returns>セル</returns>
private static DataGridCell?GetCell(DataGrid grid, DataGridRow row, int column)
{
if (row != null)
{
var presenter = FindVisualChild <DataGridCellsPresenter>(row);
if (presenter == null)
{
row.ApplyTemplate();
presenter = FindVisualChild <DataGridCellsPresenter>(row);
}
if (presenter != null)
{
var cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
if (cell != null)
{
grid.ScrollIntoView(row, grid.Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
}
return(cell);
}
}
return(null);
}
