/// <summary>
/// Handles the button click on the cancel button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCancel_Click(object sender, RoutedEventArgs e)
{
Button btnCancel = (Button)sender;
ListView filterListView = (ListView)btnCancel.Tag;
Popup popup = (Popup)UIHelpers.FindElementOfTypeUp(filterListView, typeof(Popup));
popup.IsOpen = false;
}
/// <summary>
/// Handles the button click on the ok button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnOk_Click(object sender, RoutedEventArgs e)
{
Button btnOk = (Button)sender;
ListView filterListView = (ListView)btnOk.Tag;
// navigate up to the header to obtain the filter property name
GridViewColumnHeader header = (GridViewColumnHeader)UIHelpers.FindElementOfTypeUp(filterListView, typeof(GridViewColumnHeader));
SortableGridViewColumn column = (SortableGridViewColumn)header.Column;
String currentFilterProperty = column.SortPropertyName;
var items = new List <FilterItem>();
foreach (object o in filterListView.Items)
{
var item = (FilterItem)o;
if (item.IsChecked)
{
items.Add(item);
}
}
if (items.Exists(i => i.ItemView.Equals("Clear")))
{
if (currentFilters.ContainsKey(currentFilterProperty))
{
FilterStruct filter = (FilterStruct)currentFilters[currentFilterProperty];
filter.button.ContentTemplate = (DataTemplate)dictionary["filterButtonInactiveTemplate"];
if (FilterButtonInactiveStyle != null)
{
filter.button.Style = FilterButtonInactiveStyle;
}
currentFilters.Remove(currentFilterProperty);
}
ApplyCurrentFilters();
}
else
{
// find the button and apply the active style
Button button = (Button)UIHelpers.FindVisualElement(header, "filterButton");
button.ContentTemplate = (DataTemplate)dictionary["filterButtonActiveTemplate"];
if (FilterButtonActiveStyle != null)
{
button.Style = FilterButtonActiveStyle;
}
AddFilters(currentFilterProperty, items.ToArray(), button);
ApplyCurrentFilters();
}
// navigate up to the popup and close it
Popup popup = (Popup)UIHelpers.FindElementOfTypeUp(filterListView, typeof(Popup));
popup.IsOpen = false;
}
/// <summary>
/// Handles the selection change event from the filter popup
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SelectionChangedHandler(object sender, SelectionChangedEventArgs e)
{
// obtain the term to filter for
ListView filterListView = (ListView)sender;
FilterItem filterItem = (FilterItem)filterListView.SelectedItem;
// navigate up to the header to obtain the filter property name
GridViewColumnHeader header = (GridViewColumnHeader)UIHelpers.FindElementOfTypeUp(filterListView, typeof(GridViewColumnHeader));
SortableGridViewColumn column = (SortableGridViewColumn)header.Column;
String currentFilterProperty = column.SortPropertyName;
if (filterItem == null)
{
return;
}
// determine whether to clear the filter for this column
if (filterItem.ItemView.Equals("Clear"))
{
if (currentFilters.ContainsKey(currentFilterProperty))
{
FilterStruct filter = (FilterStruct)currentFilters[currentFilterProperty];
filter.button.ContentTemplate = (DataTemplate)dictionary["filterButtonInactiveTemplate"];
if (FilterButtonInactiveStyle != null)
{
filter.button.Style = FilterButtonInactiveStyle;
}
currentFilters.Remove(currentFilterProperty);
}
ApplyCurrentFilters();
}
else
{
// find the button and apply the active style
Button button = (Button)UIHelpers.FindVisualElement(header, "filterButton");
button.ContentTemplate = (DataTemplate)dictionary["filterButtonActiveTemplate"];
if (FilterButtonActiveStyle != null)
{
button.Style = FilterButtonActiveStyle;
}
AddFilter(currentFilterProperty, filterItem, button);
ApplyCurrentFilters();
}
// navigate up to the popup and close it
Popup popup = (Popup)UIHelpers.FindElementOfTypeUp(filterListView, typeof(Popup));
popup.IsOpen = false;
}
/// <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;
}
}
}
