public override void OnApplyTemplate()
{
base.OnApplyTemplate();
// ensure that the custom inactive style is applied
if (FilterButtonInactiveStyle != null)
{
List <FrameworkElement> columnHeaders = UIHelpers.FindElementsOfType(this, typeof(GridViewColumnHeader));
foreach (FrameworkElement columnHeader in columnHeaders)
{
Button button = (Button)UIHelpers.FindElementOfType(columnHeader, typeof(Button));
if (button != null)
{
button.Style = FilterButtonInactiveStyle;
}
}
}
}
/// <summary>
/// Handles the ShowFilter command to populate the filter list and display the popup
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ShowFilterCommand(object sender, ExecutedRoutedEventArgs e)
{
Button button = e.OriginalSource as Button;
if (button != null)
{
// navigate up to the header
GridViewColumnHeader header = (GridViewColumnHeader)UIHelpers.FindElementOfTypeUp(button, typeof(GridViewColumnHeader));
// then down to the popup
Popup popup = (Popup)UIHelpers.FindElementOfType(header, typeof(Popup));
if (popup != null)
{
// find the property name that we are filtering
SortableGridViewColumn column = (SortableGridViewColumn)header.Column;
String propertyName = column.SortPropertyName;
// clear the previous filter
if (filterList == null)
{
filterList = new ArrayList();
}
filterList.Clear();
// if this property is currently being filtered, provide an option to clear the filter.
if (IsPropertyFiltered(propertyName))
{
filterList.Add(new FilterItem("Clear"));
}
else
{
bool containsNull = false;
//PropertyDescriptor filterPropDesc = TypeDescriptor.GetProperties(typeof(Airport))[propertyName];
// iterate over all the objects in the list
foreach (Object item in Items)
{
object value = getPropertyValue(item, propertyName);
if (value != null)
{
FilterItem filterItem = new FilterItem(value as IComparable);
Boolean contains = filterList.Cast <FilterItem>().ToList().Exists(i => i.Item.ToString() == filterItem.Item.ToString());
if (!filterList.Contains(filterItem) && !contains)
{
filterList.Add(filterItem);
}
}
else
{
containsNull = true;
}
}
filterList.Sort();
if (containsNull)
{
filterList.Add(new FilterItem(null));
}
}
// open the popup to display this list
popup.DataContext = filterList;
CollectionViewSource.GetDefaultView(filterList).Refresh();
popup.IsOpen = true;
// connect to the selection change event
ListView listView = UIHelpers.FindChild <ListView>(popup.Child, "filterList");
//listView.SelectionChanged += SelectionChangedHandler;
Button btnOk = UIHelpers.FindChild <Button>(popup.Child, "btnOk");
btnOk.Click += btnOk_Click;
Button btnCancel = UIHelpers.FindChild <Button>(popup.Child, "btnCancel");
btnCancel.Click += btnCancel_Click;
}
}
}