AgainMe AgainMe - 2 months ago 27
C# Question

How to remove blur effect from ListBox?

I'm trying to remove the blur effect when the mouse is over the

ListBox
, what I did is this:

<ListBox VerticalAlignment="Stretch"
Background="AliceBlue"
ScrollViewer.CanContentScroll="False"
ScrollViewer.VerticalScrollBarVisibility="Visible"
ItemsSource="{Binding EventInfo}">
<ListBox.Resources>
<Style TargetType="ListBox">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>


this doesn't solve the problem, cause I get the same blue background. Note that I'm use mahapp, I don't know if this can be a problem for the style override.

Answer

You need to change your ItemContainerStyle instead. This sample uses a redish tone just to make the point, but you can change it by setting Item.MouseOver.Background to Transparent:

<Controls:MetroWindow
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                  xmlns:Controls="http://metro.mahapps.com/winfx/xaml/controls"
                  xmlns:local="clr-namespace:MahApps.Metro.Application19" 
                  x:Class="MahApps.Metro.Application19.MainWindow"
                  Title="MainWindow"
                  Height="350"
                  Width="525">
<Controls:MetroWindow.Resources>

    <Style x:Key="FocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <SolidColorBrush x:Key="Item.MouseOver.Background" Color="#1FFF0000"/>
    <SolidColorBrush x:Key="Item.MouseOver.Border" Color="#a826A0Da"/>
    <SolidColorBrush x:Key="Item.SelectedInactive.Background" Color="#3DDADADA"/>
    <SolidColorBrush x:Key="Item.SelectedInactive.Border" Color="#FFDADADA"/>
    <SolidColorBrush x:Key="Item.SelectedActive.Background" Color="#3D26A0DA"/>
    <SolidColorBrush x:Key="Item.SelectedActive.Border" Color="#FF26A0DA"/>
    <Style x:Key="ListBoxItemStyle1" TargetType="{x:Type ListBoxItem}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="Padding" Value="4,1"/>
        <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderBrush" Value="Transparent"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Border>
                    <ControlTemplate.Triggers>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsMouseOver" Value="True"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.MouseOver.Background}"/>
                            <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.MouseOver.Border}"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="Selector.IsSelectionActive" Value="False"/>
                                <Condition Property="IsSelected" Value="True"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.SelectedInactive.Background}"/>
                            <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.SelectedInactive.Border}"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="Selector.IsSelectionActive" Value="True"/>
                                <Condition Property="IsSelected" Value="True"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.SelectedActive.Background}"/>
                            <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.SelectedActive.Border}"/>
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="TextElement.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>


</Controls:MetroWindow.Resources>

<Controls:MetroWindow.DataContext>
    <local:MyViewModel/>
</Controls:MetroWindow.DataContext>

<Grid>
    <ListBox VerticalAlignment="Stretch"
                 ScrollViewer.CanContentScroll="False"
                 ScrollViewer.VerticalScrollBarVisibility="Visible"
                 ItemContainerStyle="{StaticResource ListBoxItemStyle1}"
                 ItemsSource="{Binding EventInfo}" >
    </ListBox>
</Grid>

enter image description here

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