WPF按钮：如何仅通过样式实现回车键触发Pressed状态效果？

我有一个自定义样式的Button，已为其Pressed状态设置触发器：

<ControlTemplate.Triggers>
    <Trigger Property="IsPressed" Value="True">
    <Setter Property="Background" TargetName="BorderButton" Value="#0061AE" />
</ControlTemplate.Triggers>

当按钮获得焦点时，按空格键可正常触发该Pressed状态，按住空格时能看到对应的视觉效果；但按回车键时，按钮会直接触发命令动作，完全看不到Pressed状态的视觉反馈。请问能否不使用后台代码，仅通过修改样式让回车键实现和空格键相同的Pressed状态效果？

我的Button代码 #

<Button Style="{DynamicResource BrandedButtonStyle}" Grid.Row="7" Grid.Column="0" Grid.ColumnSpan="2" 
                    Width="316"
                    HorizontalAlignment="Left" 
                    Margin="40,0,40,0"
                    Content="{i18n:Translate Wizard_Btn_Next}" 
                    Command="{Binding Path=NextCommand}" 
                    AutomationProperties.AutomationId="ButtonNext"/>

对应的样式代码 #

<Style x:Key="BrandedButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="Background" Value="{DynamicResource Secondary}" />
        <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
        <Setter Property="FontSize" Value="14" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="MinWidth" Value="132" />
        <Setter Property="MinHeight" Value="32" />
        <Setter Property="Padding" Value="12,8" />
        <Setter Property="FocusVisualStyle" Value="{DynamicResource ButtonFocusVisual}" />

        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border Background="{TemplateBinding Background}" x:Name="BorderButton" BorderThickness="0">
                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5,0" />
                    </Border>

                    <ControlTemplate.Triggers>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter Property="Background" TargetName="BorderButton" Value="{DynamicResource SecondaryPress}" />
                            <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
                        </Trigger>

                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Background" Value="{DynamicResource OnBackground10}" />
                            <Setter Property="Foreground" Value="{DynamicResource OnBackground30}" />
                        </Trigger>

                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="{DynamicResource SecondaryHover}" />
                            <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

这是WPF的默认行为：空格键按住时会保持IsPressed为True直到松开，而回车键会立即触发命令并跳过视觉反馈。要仅通过样式实现一致效果，可通过添加输入绑定和多触发器来模拟空格键的视觉反馈逻辑。

修改后的完整样式代码如下：

<Style x:Key="BrandedButtonStyle" TargetType="{x:Type Button}">
    <Setter Property="Background" Value="{DynamicResource Secondary}" />
    <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
    <Setter Property="FontSize" Value="14" />
    <Setter Property="SnapsToDevicePixels" Value="True" />
    <Setter Property="MinWidth" Value="132" />
    <Setter Property="MinHeight" Value="32" />
    <Setter Property="Padding" Value="12,8" />
    <Setter Property="FocusVisualStyle" Value="{DynamicResource ButtonFocusVisual}" />

    <!-- 绑定回车键触发按钮点击命令 -->
    <Setter Property="InputBindings">
        <Setter.Value>
            <InputBindingCollection>
                <KeyBinding Key="Enter" Command="{x:Static ButtonBase.ClickCommand}" />
            </InputBindingCollection>
        </Setter.Value>
    </Setter>

    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Background="{TemplateBinding Background}" x:Name="BorderButton" BorderThickness="0">
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5,0" />
                </Border>

                <ControlTemplate.Triggers>
                    <!-- 保留原有触发器 -->
                    <Trigger Property="IsPressed" Value="True">
                        <Setter Property="Background" TargetName="BorderButton" Value="{DynamicResource SecondaryPress}" />
                        <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
                    </Trigger>

                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Background" Value="{DynamicResource OnBackground10}" />
                        <Setter Property="Foreground" Value="{DynamicResource OnBackground30}" />
                    </Trigger>

                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="{DynamicResource SecondaryHover}" />
                        <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
                    </Trigger>

                    <!-- 多触发器：聚焦且回车键按下时应用Pressed样式 -->
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsFocused" Value="True" />
                            <Condition Property="Keyboard.IsKeyDown" Value="Enter" />
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="BorderButton" Value="{DynamicResource SecondaryPress}" />
                        <Setter Property="Foreground" Value="{DynamicResource OnSecondary}" />
                    </MultiTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

说明 #

1. KeyBinding确保回车键触发按钮的点击命令，和默认行为一致；
2. MultiTrigger会在按钮获得焦点且回车键按下时，应用和IsPressed完全相同的视觉样式，按住回车键时就能看到和空格键一致的反馈；
3. 松开回车键后，多触发器条件不满足，样式自动恢复，同时触发命令执行。

此修改无需任何后台代码，即可让回车键和空格键的视觉反馈完全对齐。

内容的提问来源于stack exchange，提问作者H44R