創建一個自定義的控制,如:
public class CrazyCombo : ComboBox
{
static CrazyCombo()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(CrazyCombo), new FrameworkPropertyMetadata(typeof(CrazyCombo)));
}
public int InitialDisplayItem
{
get { return (int)GetValue(InitialDisplayItemProperty); }
set { SetValue(InitialDisplayItemProperty, value); }
}
// Using a DependencyProperty as the backing store for InitialDisplayItem. This enables animation, styling, binding, etc...
public static readonly DependencyProperty InitialDisplayItemProperty =
DependencyProperty.Register("InitialDisplayItem", typeof(int), typeof(CrazyCombo), new UIPropertyMetadata(0));
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
var moreLessButton = Template.FindName("moreLessButton", this) as Button;
moreLessButton.Click += new RoutedEventHandler(moreLessButton_Click);
}
void moreLessButton_Click(object sender, RoutedEventArgs e)
{
var moreLessButton = Template.FindName("moreLessButton", this) as Button;
if (moreLessButton.Content.ToString() == "More")
{
var icv = CollectionViewSource.GetDefaultView(Items);
icv.Filter = null;
moreLessButton.Content = "Less";
}
else
{
var icv = CollectionViewSource.GetDefaultView(Items);
icv.Filter += o => Items.OfType<object>().Take(InitialDisplayItem).Contains(o);
moreLessButton.Content = "More";
}
}
protected override void OnItemsSourceChanged(System.Collections.IEnumerable oldValue, System.Collections.IEnumerable newValue)
{
base.OnItemsSourceChanged(oldValue, newValue);
var icv = CollectionViewSource.GetDefaultView(Items);
icv.Filter += o => Items.OfType<object>().Take(InitialDisplayItem).Contains(o);
}
}
在你需要把整個風格爲標準組合框的generic.xaml,您可以使用混合得到它。我不會發布它,因爲它是huuuuuggge。您將需要更改以下部分:
樣式更改爲指向您的自定義控制即
<Style TargetType="{x:Type local:CrazyCombo}">
在組合框彈出添加更多/更少按鈕
<Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
<Microsoft_Windows_Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=MainGrid}">
<Border x:Name="DropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
<StackPanel>
<ScrollViewer x:Name="DropDownScrollViewer">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=DropDownBorder}" Height="{Binding ActualHeight, ElementName=DropDownBorder}" Width="{Binding ActualWidth, ElementName=DropDownBorder}"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</ScrollViewer>
<Button Name="moreLessButton" Content="More"/>
</StackPanel>
</Border>
</Microsoft_Windows_Themes:SystemDropShadowChrome>
</Popup>
唯一除了標準的組合框控制模板是線
<Button Name="moreLessButton" Content="More"/>
然後你瑟像
<Window x:Class="WpfApplication4.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication4"
Title="MainWindow" Height="350" Width="525" Foreground="red">
<StackPanel>
<local:CrazyCombo x:Name="bah" ItemsSource="{Binding Foo}" InitialDisplayItem="1"/>
</StackPanel>
如果你這樣做了真實的你一定會添加觸發器按鈕所以只如果有多個項目,則「InitialDisplayItem」顯示自定義控制。你可能也會使按鈕成爲切換按鈕而不是我愚蠢的切換代碼。
謝謝!我會嘗試讓你知道! :) – DEN 2012-07-27 05:51:55
非常感謝你!解決方案像魅力一樣工作! – DEN 2012-07-27 06:23:59
不錯的工作人,愛的InitialDisplayItem dep道具。 – knockando 2012-11-26 17:54:24