RadGridView - ToolTip for Dynamically Created Column

[Jon]

Hi - 

I have a RadGridView that populates dynamically based on columns present in an Excel spread-sheet. I'm able to create the columns but not having luck getting the ToolTip to display. 

Thanks in advance - Jon

Here is my code snippet: 

               foreach (DataColumn column in dt.Columns)
                {
                    Telerik.Windows.Controls.GridViewDataColumn gridviewDataColumn = new Telerik.Windows.Controls.GridViewDataColumn
                    {
                        Header = column.ColumnName,
                        Name = column.ColumnName,
                        DataMemberBinding = new System.Windows.Data.Binding(column.ColumnName),
                        // Tooltip = ??? 
                    };

                    dtg_PreviewMapGrid.Columns.Add(gridviewDataColumn);
                }
                dtg_PreviewMapGrid.ItemsSource = dt;

 

[Dinko | Tech Support Engineer]

Hi Jon,

I am assuming that you want to set ToolTip to the cell. What I can suggest you is to subscribe to the MouseEnter and MouseLeave events of the GridViewCell. In the mouse enter event handler, you can set the value of the tooltip and its duration. In the MouseLeave event handler, I am unsubscribing from the events for performance purpose. You can subscribe to these events using EventManager and its RegisterClassHandler().

public MainWindow()
{
    InitializeComponent();
    EventManager.RegisterClassHandler(typeof(GridViewCell), GridViewCell.MouseEnterEvent, new RoutedEventHandler(OnMouseEnterEvent));
    EventManager.RegisterClassHandler(typeof(GridViewCell), GridViewCell.MouseLeaveEvent, new RoutedEventHandler(OnMouseLeaveEvent));
}

private void OnMouseLeaveEvent(object sender, RoutedEventArgs e)
{
    var cell = sender as GridViewCell;
    cell.MouseEnter -= OnMouseEnterEvent;
    cell.MouseLeave -= OnMouseLeaveEvent;
}

private void OnMouseEnterEvent(object sender, RoutedEventArgs e)
{
    var cell = sender as GridViewCell;
    cell.ToolTip = cell.Value;
    ToolTipService.SetShowDuration(cell, 2000);
}

Hope this information is helpful.

Regards,
Dinko
Progress Telerik

[Jon]

That was exactly what I needed! 

In case this will be helpful to someone else - in my case I have 6 grids total but only this one is dynamically created, so I needed this code to fire only for that grid. To filter out only the grid I wanted (named dtg_PreviewMapGrid), I used this code: 

            if (!((GridViewCell)sender).ParentOfType<RadGridView>().Name.Equals(dtg_PreviewMapGrid.Name))
            {
                return;
            }

I am using dtg_PreviewMapGrid.Name instead of "dtg_PreviewMapGrid" as the quoted string would cause a breaking change if someone ever changes the name of the grid.I always try and avoid quoted strings in code.  

Much thanks - Jon 

[Antti]

Here is a little more straight forward solution:

public MyWindow() {
    InitializeComponent();
    DataContext = this;
    MyDataGridView.AutoGeneratingColumn += DataGridView_AutoGeneratingColumn;
}

private void DataGridView_AutoGeneratingColumn(object sender, GridViewAutoGeneratingColumnEventArgs e) {
    if (e.Column.Header.ToString() == "Status") {
        var baseStyle = (Style)e.Column.FindResource("GridViewHeaderCellStyle");
        var style = new Style() { TargetType = typeof(GridViewHeaderCell), BasedOn = baseStyle };
        style.Setters.Add(
            new Setter() {
                Property = ToolTipService.ToolTipProperty,
                Value = "My tooltip"
            });
        e.Column.HeaderCellStyle = style;
     }
 }