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2011-12-18T22:36:21.937
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2011-12-18T22:36:21.937
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<p>I have looked out the tips that you can find on the internet and I just noticed there are no problems.</p> <p>The following things should be followed carefully, because otherwise the virtualization is gone (taken from MSDN, <a href="http://msdn.microsoft.com/en-us/library/cc716879.aspx" rel="nofollow">link</a>):</p> <ul> <li>Item containers are added directly to the ItemsControl. For example, if an application explicitly adds ListBoxItem objects to a ListBox, the ListBox does not virtualize the ListBoxItem objects.</li> <li>Setting CanContentScroll to false.</li> <li>Setting IsVirtualizing to false.</li> <li>Using item grouping.</li> </ul> <p>The following style works for me without problems.</p> <pre><code><Style x:Key="SimpleComboBox" TargetType="{x:Type ComboBox}"> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <VirtualizingStackPanel IsItemsHost="True" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling" KeyboardNavigation.DirectionalNavigation="Contained" /> </ItemsPanelTemplate> </Setter.Value> </Setter> </Style> <ComboBox Name="cbTest" IsEditable="True" Style="{StaticResource SimpleComboBox}" /> </code></pre> <p><br/> After I played around for a while with the style of <a href="http://kaxaml.com/" rel="nofollow">Kaxaml</a>, I noticed a small thing. With this style I've had problems when I used <code>IsEditable = "True"</code>, the performance goes down!</p> <p>The following style works for me perfect</p> <pre><code><Style x:Key="SimpleComboBox" TargetType="{x:Type ComboBox}"> <Setter Property="SnapsToDevicePixels" Value="true"/> <Setter Property="OverridesDefaultStyle" Value="true"/> <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/> <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/> <Setter Property="ScrollViewer.CanContentScroll" Value="true"/> <Setter Property="MinWidth" Value="120"/> <Setter Property="MinHeight" Value="20"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ComboBox}"> <Grid> <ToggleButton Name="ToggleButton" Focusable="false" ClickMode="Press" IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"> <ToggleButton.Template> <ControlTemplate TargetType="{x:Type ToggleButton}"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition Width="20" /> </Grid.ColumnDefinitions> <Border x:Name="Border" Grid.ColumnSpan="2" CornerRadius="2" Background="#C0C0C0" BorderBrush="#404040" BorderThickness="1" /> <Border Grid.Column="0" CornerRadius="2,0,0,2" Margin="1" Background="#FFFFFF" BorderBrush="#404040" BorderThickness="0,0,1,0" /> <Path x:Name="Arrow" Grid.Column="1" Fill="#404040" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="ToggleButton.IsMouseOver" Value="true"> <Setter TargetName="Border" Property="Background" Value="#808080" /> </Trigger> <Trigger Property="ToggleButton.IsChecked" Value="true"> <Setter TargetName="Border" Property="Background" Value="#E0E0E0" /> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="Border" Property="Background" Value="#EEEEEE" /> <Setter TargetName="Border" Property="BorderBrush" Value="#AAAAAA" /> <Setter Property="Foreground" Value="#888888"/> <Setter TargetName="Arrow" Property="Fill" Value="#888888" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </ToggleButton.Template> </ToggleButton> <ContentPresenter Name="ContentSite" IsHitTestVisible="False" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3,3,23,3" VerticalAlignment="Center" HorizontalAlignment="Left" /> <TextBox x:Name="PART_EditableTextBox" Style="{x:Null}" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="3,3,23,3" Focusable="True" Background="Transparent" Visibility="Hidden" IsReadOnly="{TemplateBinding IsReadOnly}"> <TextBox.Template> <ControlTemplate TargetType="{x:Type TextBox}"> <Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" /> </ControlTemplate> </TextBox.Template> </TextBox> <Popup Name="Popup" Placement="Bottom" IsOpen="{TemplateBinding IsDropDownOpen}" AllowsTransparency="True" Focusable="False" PopupAnimation="Slide"> <Grid Name="DropDown" SnapsToDevicePixels="True" MinWidth="{TemplateBinding ActualWidth}" MaxHeight="{TemplateBinding MaxDropDownHeight}"> <Border x:Name="DropDownBorder" Background="#FFFFFF" BorderThickness="1" BorderBrush="#888888"/> <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True"> <VirtualizingStackPanel IsItemsHost="True" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling" KeyboardNavigation.DirectionalNavigation="Contained" /> </ScrollViewer> </Grid> </Popup> </Grid> <ControlTemplate.Triggers> <Trigger Property="HasItems" Value="false"> <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Foreground" Value="#888888"/> </Trigger>  <Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true"> <Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/> <Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/> </Trigger> <Trigger Property="IsEditable" Value="true"> <Setter Property="IsTabStop" Value="false"/> <Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/> <Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> <Style.Triggers> </Style.Triggers> </Style> </code></pre> <p>I have also removed this trigger.</p> <pre><code><Trigger Property="IsGrouping" Value="true"> <Setter Property="ScrollViewer.CanContentScroll" Value="false"/> </Trigger> </code></pre> <p>Hope this helps</p>
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