Hide Column / Column Chooser Events

[erwin]

Hi!

what's the best event to check if the user has interactively hidden a column or selected a column from the column chooser?

Regards
Erwin

[George]

Hi Erwin,

Thank you for contacting us.

You can detect whether a user has hidden a column using the context menu by subscribing to the corresponding RadMenuItem. You can also subscribe to the DoubleClick event of the hidden columns in order to be notified when a user is unhiding a column from the ColumnChooser:

this.grid.ContextMenuOpening += grid_ContextMenuOpening;

private void SubscribeForItemsInColumnChooser()
{
    foreach (var item in this.grid.ColumnChooser.ColumnChooserControl.ColumnChooserElement.ElementsHolder.Children)
    {
        ColumnChooserItem columnItem = item as ColumnChooserItem;
        if (columnItem != null)
        {
            columnItem.DoubleClick -=columnItem_DoubleClick;
            columnItem.DoubleClick +=columnItem_DoubleClick;
        }
    }
}

void columnItem_DoubleClick(object sender, EventArgs e)
{
    RadMessageBox.Show("User showing column");
}

void grid_ContextMenuOpening(object sender, ContextMenuOpeningEventArgs e)
{
    foreach (object item in e.ContextMenu.Items)
    {
        RadMenuItem menuItem = item as RadMenuItem;
        if (menuItem != null && menuItem.Text == "Hide Column")
        {
            menuItem.Click -= menuItem_Click;
            menuItem.Click += menuItem_Click;
        }
    }
}

void menuItem_Click(object sender, EventArgs e)
{
    RadMessageBox.Show("User Hiding Column");
    this.SubscribeForItemsInColumnChooser();
}

You can also use the PropertyChanged event of the columns:

foreach (GridViewColumn item in this.grid.Columns)
{
    item.PropertyChanged += item_PropertyChanged;
}

void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    if (e.PropertyName == "IsVisible")
    {
    }
}

I hope this helps.
 
Regards,
George
Telerik

[erwin]

Thanks, Mark.

I'ver implemented the Property Changed Event solution, works perfectly.

Regards
Erwin