这是一个WPF计划。 我用c＃代码绘制一个椭圆，然后插入网格的Children。 它位于TreeViewItem。
我只是看到前面的椭圆部分已经被lengthConverter转换。
xp风格：<Style x:Key="{x:Type TreeViewItem}"
TargetType="{x:Type TreeViewItem}">
<Setter Property="Background"
Value="Transparent"/>
<Setter Property="HorizontalContentAlignment"
Value="{Binding Path=HorizontalContentAlignment,
RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment"
Value="{Binding Path=VerticalContentAlignment,
RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding"
Value="1,0,0,0"/>
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="FocusVisualStyle"
Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<ControlTemplate.Resources>
<converters:LeftMarginMultiplierConverter Length="19" x:Key="lengthConverter" />
</ControlTemplate.Resources>
<StackPanel>
<Border Name="Bd"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}">
<Grid Name="Gd" Margin="{Binding Converter={StaticResource lengthConverter},
RelativeSource={RelativeSource TemplatedParent}}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="19" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<ToggleButton x:Name="Expander"
Style="{StaticResource ExpandCollapseToggleStyle2}"
IsChecked="{Binding Path=IsExpanded,
RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press"/>
<ContentPresenter x:Name="PART_Header"
Grid.Column="1"
ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
</Grid>
</Border>
<ItemsPresenter x:Name="ItemsHost" />
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded"
Value="false">
<Setter TargetName="ItemsHost"
Property="Visibility"
Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems"
Value="false">
<Setter TargetName="Expander"
Property="Visibility"
Value="Hidden"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader"
Value="false"/>
<Condition Property="Width"
Value="Auto"/>
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header"
Property="MinWidth"
Value="75"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader"
Value="false"/>
<Condition Property="Height"
Value="Auto"/>
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header"
Property="MinHeight"
Value="19"/>
</MultiTrigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="Bd"
Property="Background"
Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"></Setter>
</Trigger>
<Trigger Property="IsSelected"
Value="true">
<Setter TargetName="Bd"
Property="Background"
Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected"
Value="true"/>
<Condition Property="IsSelectionActive"
Value="false"/>
</MultiTrigger.Conditions>
<Setter TargetName="Bd"
Property="Background"
Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
</MultiTrigger>
<Trigger Property="IsEnabled"
Value="false">
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
C＃代码：
var item = sender as TreeViewItem;
if (item.Items.Count > 0) return;
var controlTemplate = item.Template as ControlTemplate;
var grid=controlTemplate.FindName("Gd",item) as Grid;
var p = args.GetPosition((IInputElement)item);
var elli = new Ellipse
{
Width = 0,
Height = 0,
Fill = Brushes.White,
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top,
Opacity = .6
};
grid.Children.Insert(0,elli);
var animation = new DoubleAnimation(0, new Duration(TimeSpan.FromMilliseconds(400)));
animation.Completed += (s, e1) =>
{
grid.Children.Remove(elli);
};
elli.BeginAnimation(OpacityProperty, animation);
elli.BeginAnimation(HeightProperty, new DoubleAnimation(600, new Duration(TimeSpan.FromMilliseconds(400))));
elli.BeginAnimation(WidthProperty, new DoubleAnimation(600, new Duration(TimeSpan.FromMilliseconds(400))));
elli.BeginAnimation(MarginProperty, new ThicknessAnimation(new Thickness(p.X, p.Y, 0, 0), new Thickness(p.X - 300, p.Y - 300, 0, 0), new Duration(TimeSpan.FromMilliseconds(400))));
答案 0 :(得分：0)
因为我将椭圆插入网格的第一列。我设置列来解决它。