替换WPF默认模板的一部分 [英] Replace part of default template in WPF
问题描述
有没有最佳实践的方式来替代默认模板的一部分。目前的使用情况是一个TreeView。由于默认情况下，树形视图有这个小三角形状展开和折叠。
is there any "best practice" way to replace a part of the default template. The current use case is a treeview. As default, the treeview has this small triangle shapes to expand and collapse.
我知道如何替换这些，如果我更换整个控制模板，如下面的code。我不知道是否有一种方法来保持所有默认，只是改变XY。它不是一种风格，我基本上需要更换现有的控件模板的一部分。
I know how to replace these if I replace the whole control template, as shown in the code below. I am not sure if there is a way to "keep all default, just change XY". Its not a style, I basically need to replace a part of an existing control template.
要说明这一点，看看下面的XAML。第一个较小的块是相关的XAML我希望能够适应。
To illustrate, take a look at the following XAML. The first smaller block is the relevant XAML I want to be able to adapt.
更大的第二部分和第三部分基本上都是默认模板复制，只是管理的改变的一部分，从一开始。
The bigger second and third part are basically a copy of the default templates, only to administer the "changed" part from the beginning.
有没有更好的方式来做到这一点，节省了漫长而混乱的XAML在下半年？
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
<Style x:Key="ExpandCollapseToggleStyle" TargetType="ToggleButton">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid
Width="15"
Height="13"
Background="Transparent">
<Path x:Name="ExpandPath"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="1,1,1,1"
Fill="Black"
Data="M 4 0 L 8 4 L 4 8 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked"
Value="True">
<Setter Property="Data"
TargetName="ExpandPath"
Value="M 0 4 L 8 4 L 4 8 Z"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19"
Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton x:Name="Expander"
Style="{StaticResource ExpandCollapseToggleStyle}"
IsChecked="{Binding Path=IsExpanded,
RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press"/>
<Border Name="Bd"
Grid.Column="1"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}">
<ContentPresenter x:Name="PART_Header"
ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost"
Grid.Row="1"
Grid.Column="1"
Grid.ColumnSpan="2"/>
</Grid>
<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="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>
推荐答案
不幸的是，我认为你必须更换整个模板：
Unfortunately, I think you have to replace the entire template:
从MSDN：<一href=\"http://msdn.microsoft.com/en-us/library/aa970773.aspx\">http://msdn.microsoft.com/en-us/library/aa970773.aspx
在Windows presentation控制
基金会（WPF）有
的ControlTemplate包含
该控件的可视化树。您可以
改变的结构和外观
通过修改的控制
该控件的ControlTemplate中。那里
没有办法替代的唯一部分
控件的可视化树;改变
控件的可视化树，你必须
设置的模板属性
控制其新的和完整的
控件模板。
Controls in Windows Presentation Foundation (WPF) have a ControlTemplate that contains the visual tree of that control. You can change the structure and appearance of a control by modifying the ControlTemplate of that control. There is no way to replace only part of the visual tree of a control; to change the visual tree of a control you must set the Template property of the control to its new and complete ControlTemplate.
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