/// <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)Helpers.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)Helpers.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)Helpers.FindElementOfTypeUp(filterListView, typeof(Popup));
popup.IsOpen = false;
}
public override bool Equals(object obj)
{
FilterItem otherItem = obj as FilterItem;
if (otherItem != null && this.Item != null)
{
if (otherItem.Item.ToString() == this.Item.ToString())
{
return(true);
}
}
return(false);
}
public int CompareTo(object obj)
{
FilterItem otherFilterItem = (FilterItem)obj;
if (this.Item == null && obj == null)
{
return(0);
}
else if (otherFilterItem.Item != null && this.Item != null)
{
return(((IComparable)item).CompareTo((IComparable)otherFilterItem.item));
}
else
{
return(-1);
}
}
private void ShowFilterCommand(object sender, ExecutedRoutedEventArgs e)
{
Button button = e.OriginalSource as Button;
if (button != null)
{
// navigate up to the header
GridViewColumnHeader header = (GridViewColumnHeader)Helpers.FindElementOfTypeUp(button, typeof(GridViewColumnHeader));
if (header == null)
{
return;
}
// then down to the popup
Popup popup = (Popup)Helpers.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(Log))[propertyName];
PropertyDescriptor filterPropDesc = TypeDescriptor.GetProperties(FilterType.GetType())[propertyName];
// iterate over all the objects in the list
foreach (Object item in Items)
{
object value = filterPropDesc.GetValue(item);
if (value != null)
{
FilterItem filterItem = new FilterItem(value as IComparable);
if (!filterList.Contains(filterItem))
{
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 = (ListView)popup.Child;
listView.SelectionChanged += SelectionChangedHandler;
}
}
}
public FilterStruct(String property, Button button, FilterItem value)
{
this.value = value;
this.button = button;
this.property = property;
}
