Event handlers for TextChanged and other events for individual cells

[Andre Slenko]

How do you attach an event handler to catch TextChanged event for default cells (TextBox) or SelectedIndexChanged event for ComboBoxes? If you use a cell template, where do you specify an event handler for a particular control in that template, so that when you catch it, you can get a reference to a cell object itself (GridStyleInfo)?

[Clay Burch]

Here is a zip file that has two samples.

One shows how to use the TextChanged event for TextBoxes and Comboboxes and get at the underlying style information.

The second one is a hyperlink sample that shows how you can use the CurrentCellMoved event to get at the information in a DataTemplate cell.



TwoSamples_8c2a7c9b.zip

[Andre Slenko]

Thank you for the samples!
How can I attach a ContentMenu to a textbox (default cell style)?

[Andre Slenko]

Another question: in the CurrentCellChanging event handler, how can I get the entered cell value. If I type "A", the event fires but style.CellValue is always "" and CurrentCell.Renderer.ControlValue is also "". How can I cancel the user input if user types an invalid value into a textbox?
I am trying to create a text cell (TextBox) that accepts only certain predefined values ("Yes", "No", "Maybe").

[Andre Slenko]

Another question: in the CurrentCellChanging event handler, how can I get the entered cell value. If I type "A", the event fires but style.CellValue is always "" and CurrentCell.Renderer.ControlValue is also "". How can I cancel the user input if user types an invalid value into a textbox?
I am trying to create a text cell (TextBox) that accepts only certain predefined values ("Yes", "No", "Maybe").

[Clay Burch]

Here is the code from one of the samples posted here yesterday.

  void grid_CurrentCellChanged(object sender, Syncfusion.Windows.ComponentModel.SyncfusionRoutedEventArgs args)
        {
            GridControl g = sender as GridControl;
            if (g != null)
            {
                GridCurrentCell cc = g.CurrentCell;
                GridStyleInfo style = g.Model[cc.RowIndex, cc.ColumnIndex];
                switch (style.CellType)
                {
                    case "TextBox":
                        this.Title = string.Format("Text Changed[{0},{1}]  newValue={2}", cc.RowIndex, cc.ColumnIndex, cc.Renderer.ControlValue);
                        break;
                    case "ComboBox":
                        this.Title = string.Format("Combo Changed[{0},{1}]  newValue={2}", cc.RowIndex, cc.ColumnIndex, cc.Renderer.ControlValue);
                        break;
                    case "DropDownList":
                        this.Title = string.Format("DropDownList Changed[{0},{1}]  newValue={2}", cc.RowIndex, cc.ColumnIndex, cc.Renderer.ControlValue);
                        break;
                    default:
                        break;
                }
            }
        }

The cc.Renderer.ControlValue gives the changed value.

If you want to cancel keystrokes, then you can try using the grid.PreviewKeyDown event.

        void grid_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            GridControl g = sender as GridControl;
            if (g != null)
            {
                GridCurrentCell cc = g.CurrentCell;
                string currentText = cc.Renderer.ControlText;
                Key newKey = e.Key;
                if (YouWantToCancel())
                {
                    e.Handled = true;
                }
            }
        }