WPF Datagrid: Programmatically editing a cell
I have a cell that needs its value to be set on it just being clicked. It is multibound to different properties.
Where am I supposed to do this? I have been trying to do it in the datagrid beginingedit handler like this (without much success). I am able to manually click twice(once to select cell and then to start edit) and the value gets set. But I want to do this programmatically...
private void MyDataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{
TextBlock t = e.EditingEventArgs.OriginalSource as TextBlock;
if (t == null) return;
t.Text = SimulatedEdit();
// All this below is just me trying different thing. Not sure what I need to be doing
e.EditingEventArgs.Handled = true;
MyDataGrid.CommitEdit();
MyDataGrid.UnselectAllCells();
}
This is how the columntemplate is setup
MultiBinding tempmb = new MultiBinding();
Binding tempXB = new Binding("X");
Binding temptYB = new Binding("Y");
tempmb.Bindings.Add(tempXB);
tempmb.Bindings.Add(temptYB);
tempmb.ConverterParameter = "ggrid";
tempmb.Converter = ne开发者_如何学运维w LabelDecider();
DataGridTemplateColumn dgtc = new DataGridTemplateColumn
{
Header = "blah", CanUserSort = false, CanUserReorder = false,
};
DataTemplate t = new DataTemplate();
FrameworkElementFactory f = new FrameworkElementFactory(typeof(TextBlock));
f.SetBinding(TextBlock.TextProperty, tempmb);
// Setup background color binding
MultiBinding colorb = new MultiBinding();
colorb.Bindings.Add(tempX);
colorb.Bindings.Add(tempY);
colorb.ConverterParameter = "color";
colorb.Converter = new LabelDecider();
f.SetBinding(TextBlock.BackgroundProperty, colorb);
t.VisualTree = f;
//Every columns Text and Background are using bindings
dgtc.CellTemplate = t;
//setup editing template
DataTemplate ced = new DataTemplate();
FrameworkElementFactory f2 = new FrameworkElementFactory(typeof(TextBox));
MultiBinding tempmb2 = new MultiBinding();
tempmb2.Bindings.Add(tempXB);
tempmb2.Bindings.Add(tempYB);
tempmb2.Mode = BindingMode.TwoWay;
tempmb2.ConverterParameter = "ggrid";
tempmb2.Converter = new LabelDecider(rDestination.Recievers[k]);
tempmb2.UpdateSourceTrigger = UpdateSourceTrigger.LostFocus;
f2.SetBinding(TextBox.TextProperty, tempmb2);
ced.VisualTree = f2;
dgtc.CellEditingTemplate = ced;
MyDataGrid.Columns.Add(dgtc);
not sure if I'm understanding your question correctly; it looks like you want to access and change the DataGridCell content programmatically. Pls check an example below; I've added a SelectedCellsChanged even hander to the datagrid, it should be triggered every time new cell(s) is selected; having the DataGridCellInfo object you can get access to the DataGridCell object and change its Content.
private void dataGrid1_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
foreach (DataGridCellInfo cellInfo in dataGrid1.SelectedCells)
{
// this changes the cell's content not the data item behind it
DataGridCell gridCell = TryToFindGridCell(dataGrid1, cellInfo);
if (gridCell!=null) gridCell.Content = "changed!!!";
}
}
static DataGridCell TryToFindGridCell(DataGrid grid, DataGridCellInfo cellInfo)
{
DataGridCell result = null;
DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(cellInfo.Item);
if (row!=null)
{
int columnIndex = grid.Columns.IndexOf(cellInfo.Column);
if (columnIndex>-1)
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
result = presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex) as DataGridCell;
}
}
return result;
}
static T GetVisualChild<T>(Visual parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null)
{
child = GetVisualChild<T>(v);
}
if (child != null)
{
break;
}
}
return child;
}
code of GetVisualChild is taken from here
hope it's going to help you, also you maight want to take a look at the BeginEdit of a specific Cell from code behind question on SO. I guess it can also give you some ideas
regards
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