/// <summary>
/// Handles a change to the Column property.
/// </summary>
/// <param name="dependencyObject">The object that originated the event.</param>
/// <param name="dependencyPropertyChangedEventArgs">The property change event arguments.</param>
static void OnColumnPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// Extract the ColumnViewColumnHeader and the property from the generic event arguments.
ColumnViewColumnHeader columnViewColumnHeader = dependencyObject as ColumnViewColumnHeader;
ColumnViewColumn columnViewColumn = dependencyPropertyChangedEventArgs.NewValue as ColumnViewColumn;
// This will force the sorting properties to reflect the sort order of the underlying column.
columnViewColumnHeader.UpdateSortDirection();
// This will keep the header property 'HasFilters' reconciled to the same property in the column it represents.
columnViewColumnHeader.SetValue(ColumnViewColumnHeader.hasFiltersPropertyKey, columnViewColumnHeader.Column.HasFilters);
}
/// <summary>
/// Handles a change to the dependency properties.
/// </summary>
/// <param name="dependencyObject">The object that originated the event.</param>
/// <param name="dependencyPropertyChangedEventArgs">The event arguments.</param>
static void OnIsSelectedPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// The filter is closed when the selection is turned off. The selection is a property that combines the keystrokes and the mouse gestures into a single
// state the shows the menu header has been selected by the user for some operation. The visual cues for the header are driven by this property and so
// is the state of the filter drop down.
ColumnViewColumnHeader columnViewColumnHeader = dependencyObject as ColumnViewColumnHeader;
if ((Boolean)dependencyPropertyChangedEventArgs.OldValue)
{
if (columnViewColumnHeader.IsFilterOpen)
{
columnViewColumnHeader.SetValue(ColumnViewColumnHeader.IsFilterOpenProperty, false);
}
}
}