删除组合框所选项目文本突出显示 [英] remove combobox selected item text highlighting
问题描述
我已经发现很多关于操作要在组合框下拉列表中选择的项目的突出显示或覆盖系统画笔的问题。这不是我的后...我想要摆脱选择的项目显示在组合框文本字段中选择后的文本突出显示。但我不想摆脱下拉列表中的文本突出显示！因此，覆盖系统画笔不是我需要的，因为这也会影响下拉列表中的项目。下面是一个完整的测试项目的XAML。构建+运行并选择项目以查看效果。组合框文本字段中任何选定项目的文本将用浅灰色的笔刷突出显示。这就是我想摆脱..但如何..？
I've already found a lot of questions about manipulating the highlight of items to select in the dropdown of the combobox or overriding system brushes. This is NOT what I'm after.. I want to get rid of the text highlighting of the selected item shown in the combobox textfield after selecting. But I do not want to get rid of the text highlighting in the dropdown! So overriding the system brushes is not what I need because that also affects the items in the dropdown. Below is XAML for a complete test project. Build + run and select an item to see the effects. The text of any selected item in the combobox textfield will be highlighted with a light grayish brush. That's what I want to get rid of.. but how..?
<Window.Resources>
<Style x:Key="ComboboxDropdownButton" TargetType="{x:Type ToggleButton}">
<Setter Property="MinWidth" Value="0"/>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="Width" Value="NaN"/>
<Setter Property="Height" Value="NaN"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<DockPanel SnapsToDevicePixels="True"
Background="{TemplateBinding Background}"
LastChildFill="False">
<Border x:Name="Border"
Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"
DockPanel.Dock="Right"
Background="WhiteSmoke"
CornerRadius="0,3,3,0"
BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
>
<Path Fill="{TemplateBinding Foreground}" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M0,0L4.5,4 9,0z"/>
</Border>
</DockPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="Border" Property="Background" Value="White" />
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="Border" Property="Background" Value="White" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Opacity" Value="0.5"/>
</Trigger>
</Style.Triggers>
</Style>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="{x:Type TextBox}">
<Border x:Name="PART_ContentHost" Focusable="False" />
</ControlTemplate>
<Style x:Key="{x:Type ComboBox}" 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>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="EditStates">
<VisualState x:Name="Editable">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"
Storyboard.TargetName="PART_EditableTextBox">
<DiscreteObjectKeyFrame KeyTime="0" Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Uneditable" />
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<DoubleAnimation Duration="00:00:00" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="(UIElement.Opacity)" To="1"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused"/>
<VisualState x:Name="FocusedDropDown">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="00:00:00" Storyboard.TargetName="DropDownBorder" Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ToggleButton x:Name="ToggleButton"
Margin="-1"
Grid.Column="2"
Focusable="False"
ClickMode="Press"
Style="{StaticResource ComboboxDropdownButton}"
IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
</ToggleButton>
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Margin="3,3,23,3"
Focusable="True"
Background="Transparent"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}" />
<Rectangle x:Name="FocusVisualElement" RadiusX="2" RadiusY="2" Margin="-3" Stroke="Red" StrokeThickness="1" Opacity="0" IsHitTestVisible="false" />
<Rectangle x:Name="BackgroundVisualElement" RadiusX="2" RadiusY="2" Margin="-1" Fill="BlanchedAlmond" Panel.ZIndex="-1" Stroke="Black" StrokeThickness="1" IsHitTestVisible="false" />
<Popup x:Name="PART_Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Border x:Name="DropDownBorder"
MaxHeight="{TemplateBinding MaxDropDownHeight}"
MinWidth="{Binding ActualWidth, ElementName=BackgroundVisualElement}"
Background="BlanchedAlmond"
BorderBrush="Black"
BorderThickness="1" CornerRadius="0,0,3,3">
<ScrollViewer>
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Border>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="95" />
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Button Margin="0,0,363,221" />
<ComboBox Width="120" Height="20" Name="comboBox1" SnapsToDevicePixels="True" HorizontalAlignment="Center" VerticalAlignment="Center" SelectedIndex="0" IsEditable="True" IsReadOnly="True">
<ComboBoxItem>item 1</ComboBoxItem>
<ComboBoxItem>item 2</ComboBoxItem>
<ComboBoxItem>item 3</ComboBoxItem>
</ComboBox>
</Grid>
</Window>
EDIT：为了更好的效果，请将Foreground =Transparent PART_EditableTextBox。
for better effect, add Foreground="Transparent" to the PART_EditableTextBox. The selected item in the combobox textfield will still show up highlighted with the light grayish brush I want to get rid of..
推荐答案
在组合框文本字段中选择的项目仍会显示为浅灰色的笔刷突出显示。如果您使用的是WPF 4，您可以将 TextBox 的 SelectionBrush 设置为 / code>
If you're using WPF 4 you can set the SelectionBrush of the TextBox to Transparent
<TextBox x:Name="PART_EditableTextBox"
SelectionBrush="Transparent"
.../>
您可以在这里阅读更多关于 SelectionBrush
http：// blogs.msdn.com/b/text/archive/2009/08/28/selection-brush.aspx
You can read more about SelectionBrush here:
http://blogs.msdn.com/b/text/archive/2009/08/28/selection-brush.aspx
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