/// <summary>
/// 将SelectedItem滚动为第一行
/// </summary>
/// <param name="dataGrid">目标DagaGrid</param>
/// <param name="selectedItem">选中项</param>
public static void SetSelectedItemFirstRow(object dataGrid, object selectedItem)
{
//若目标datagrid为空，抛出异常
if (dataGrid == null)
{
throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
}
//获取目标DataGrid，为空则抛出异常
System.Windows.Controls.DataGrid dg = dataGrid as System.Windows.Controls.DataGrid;
if (dg == null)
{
throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
}
//数据源为空则返回
if (dg.Items == null || dg.Items.Count < 1)
{
return;
}
//首先滚动为末行
dg.SelectedItem = dg.Items[dg.Items.Count - 1];
dg.CurrentColumn = dg.Columns[0];
dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn);
//获取焦点，滚动为目标行
dg.Focus();
dg.SelectedItem = selectedItem;
dg.CurrentColumn = dg.Columns[0];
dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn);
}
public static System.Windows.Controls.DataGridCell GetCell(System.Windows.Controls.DataGrid dataGrid, System.Windows.Controls.DataGridRow rowContainer, int column)
{
if (rowContainer != null)
{
System.Windows.Controls.Primitives.DataGridCellsPresenter presenter = FindVisualChild <System.Windows.Controls.Primitives.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 <System.Windows.Controls.Primitives.DataGridCellsPresenter>(rowContainer);
}
if (presenter != null)
{
System.Windows.Controls.DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as System.Windows.Controls.DataGridCell;
if (cell == null)
{
/* bring the column into view
* in case it has been virtualized away */
dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as System.Windows.Controls.DataGridCell;
}
return(cell);
}
}
return(null);
}
public static void SelectRowByIndex(System.Windows.Controls.DataGrid dataGrid, int rowIndex)
{
if (!dataGrid.SelectionUnit.Equals(System.Windows.Controls.DataGridSelectionUnit.FullRow))
{
throw new ArgumentException("The SelectionUnit of the DataGrid must be set to FullRow.");
}
if (rowIndex < 0 || rowIndex > (dataGrid.Items.Count - 1))
{
throw new ArgumentException(string.Format("{0} is an invalid row index.", rowIndex));
}
dataGrid.SelectedItems.Clear();
/* set the SelectedItem property */
object item = dataGrid.Items[rowIndex]; // = Product X
dataGrid.SelectedItem = item;
System.Windows.Controls.DataGridRow row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as System.Windows.Controls.DataGridRow;
if (row == null)
{
/* bring the data item (Product object) into view
* in case it has been virtualized away */
dataGrid.ScrollIntoView(item);
row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as System.Windows.Controls.DataGridRow;
}
//TODO: Retrieve and focus a DataGridCell object
}
public static void SelectDataGridItem(System.Windows.Controls.DataGrid dataGrid,
int index)
{
if (0 <= index && index < dataGrid.Items.Count)
{
object item = dataGrid.Items[index];
dataGrid.CurrentItem = item;
dataGrid.SelectedItem = item;
dataGrid.ScrollIntoView(item);
}
else
{
dataGrid.CurrentItem = null;
dataGrid.SelectedItem = null;
}
}
public static void SelectCellsByIndexes(System.Windows.Controls.DataGrid dataGrid, IList <KeyValuePair <int, int> > cellIndexes)
{
if (!dataGrid.SelectionUnit.Equals(System.Windows.Controls.DataGridSelectionUnit.Cell))
{
throw new ArgumentException("The SelectionUnit of the DataGrid must be set to Cell.");
}
if (!dataGrid.SelectionMode.Equals(System.Windows.Controls.DataGridSelectionMode.Extended))
{
throw new ArgumentException("The SelectionMode of the DataGrid must be set to Extended.");
}
dataGrid.SelectedCells.Clear();
foreach (KeyValuePair <int, int> cellIndex in cellIndexes)
{
int rowIndex = cellIndex.Key;
int columnIndex = cellIndex.Value;
if (rowIndex < 0 || rowIndex > (dataGrid.Items.Count - 1))
{
throw new ArgumentException(string.Format("{0} is an invalid row index.", rowIndex));
}
if (columnIndex < 0 || columnIndex > (dataGrid.Columns.Count - 1))
{
throw new ArgumentException(string.Format("{0} is an invalid column index.", columnIndex));
}
object item = dataGrid.Items[rowIndex]; //= Product X
System.Windows.Controls.DataGridRow row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as System.Windows.Controls.DataGridRow;
if (row == null)
{
dataGrid.ScrollIntoView(item);
row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as System.Windows.Controls.DataGridRow;
}
if (row != null)
{
System.Windows.Controls.DataGridCell cell = GetCell(dataGrid, row, columnIndex);
if (cell != null)
{
System.Windows.Controls.DataGridCellInfo dataGridCellInfo = new System.Windows.Controls.DataGridCellInfo(cell);
dataGrid.SelectedCells.Add(dataGridCellInfo);
cell.Focus();
}
}
}
}
public void AddTask(System.Windows.Controls.DataGrid tasksGrid)
{
//GetTimeRemaining()
SelectedTask = InternalAddTask(String.Format("Task {0}", tasks.Count + 1), ColorInfo.GetRandomColor(), new TimeInfoViewModel());
if (tasksGrid != null)
{
tasksGrid.ScrollIntoView(selectedTask);
var cellInfo = new System.Windows.Controls.DataGridCellInfo(selectedTask, tasksGrid.Columns[1]);
int row = tasksGrid.Items.IndexOf(selectedTask);
tasksGrid.CurrentCell = cellInfo;
var cell = tasksGrid.GetCell(row, 1);
if (cell != null)
{
cell.Focus();
}
tasksGrid.BeginEdit();
}
NotifyOfPropertyChange(() => CanAddTask);
NotifyOfPropertyChange(() => CanStartTasks);
NotifyOfPropertyChange(() => CanAddTasks);
CalculateValidationErrors();
}
