|
RadControls version
|
Q2 2008 SP 1 |
| .NET version |
3.5 |
| Visual Studio version |
2008 SP 1 |
| programming language |
C# |
| |
|
PROJECT DESCRIPTION
In the sample project a RadGridView uses combo boxes to
perform filtering. First, we create a control template for the
DistinctFilterControl, the control that realizes the filtering process.
| |
| <ControlTemplate x:Key="FilterControlTemplate" TargetType="{x:Type telerik:DistinctFilterControl}"> |
| <StackPanel> |
| <StackPanel Orientation="Horizontal"> |
| <ComboBox IsEditable="True" IsReadOnly="False" Name="comboBoxDistinctValues" |
| MaxHeight="500" HorizontalAlignment="Stretch" Width="70" |
| ItemsSource="{TemplateBinding DistinctValues}" |
| Loaded="ComboBox_Loaded" |
| SelectionChanged="ComboBox_SelectionChanged" /> |
| <telerik:ClearFilterButton Margin="0,0,0,5" Content="Clear Filter" |
| Target="{Binding ElementName=comboBoxDistinctValues, Mode=OneTime}" |
| FilterDescription ="{TemplateBinding FilterDescription}" /> |
| </StackPanel> |
| </StackPanel> |
| </ControlTemplate> |
| <Style TargetType="{x:Type telerik:DistinctFilterControl}"> |
| <Setter Property="Template" Value="{StaticResource FilterControlTemplate}" /> |
| </Style> |
You can see
the combo box (named "comboBoxDistinctValues") that contains the values you can
filter by. Our button, that clears your filter, is retained in the
template.
You will notice that the events Loaded and SelectionChanged of
the combo box are handled in the code-behind. The handler of Loaded:
| |
| ComboBox comboBox = (ComboBox) sender; |
| DistinctFilterControl filterControl = this.GetVisualParent<DistinctFilterControl>(comboBox); |
| this.PopulateDistinctValues(string.Empty, filterControl); |
calls
the method "PopulateDistinctValues":
| |
| GridViewHeaderCell headerCell = this.GetVisualParent<GridViewHeaderCell>(filterControl); |
| |
| string propertyName = ((IColumnInfo) headerCell).PropertyName; |
| |
| GridViewDataControl gridControl = this.GetVisualParent<GridViewDataControl>(filterControl); |
| filterControl.DistinctValues = gridControl.ItemsControl.RecordManager.GetDistinctValues(propertyName); |
which
fills the combo box with the values you can use for filtering. The event handler
for SelectionChanged:
| |
| ComboBox comboBox = (ComboBox) sender; |
| DistinctFilterControl filterControl = this.GetVisualParent<DistinctFilterControl>(comboBox); |
| FieldFilterDescription filterDescription = filterControl.FilterDescription; |
| |
| IList valueCollection; |
| if (e.AddedItems.Count > 0) |
| { |
| valueCollection = e.AddedItems; |
| foreach (object value in valueCollection) |
| { |
| filterDescription.Values.Add(value); |
| } |
| } |
| |
| if (e.RemovedItems.Count > 0) |
| { |
| valueCollection = e.RemovedItems; |
| foreach (object value in valueCollection) |
| { |
| if ((comboBox.Items.IndexOf(value) != -1)) |
| filterDescription.Values.Remove(value); |
| } |
| } |
changes
the filtering whenever you select a new value in the combo box.