WPF 视觉状态 - "Pressed"事件不会触发

Question

我第一次玩XAML ControlTemplates，并且正在处理一个基本动画，这很奇怪。

在下面的样式中，按下的视觉状态绝对不会触发缩放转换。如果我将按下更改为聚焦或鼠标悬停，它可以正常工作。

我错过了什么？

      <Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
          <Setter Property="VerticalContentAlignment" Value="Center" />
          <Setter Property="HorizontalContentAlignment" Value="Center" />
          <Setter Property="SnapsToDevicePixels" Value="True" />
          <Setter Property="BorderThickness" Value="1" />
          <Setter Property="BorderBrush" Value="{StaticResource Button.BorderBrush}" />
          <Setter Property="Template">
              <Setter.Value>
                  <ControlTemplate TargetType="{x:Type Button}">
                      <Border x:Name="Button_Border"
                              Background="{StaticResource Button.BackgroundBrush}"
                              BorderBrush="{TemplateBinding BorderBrush}"
                              BorderThickness="{TemplateBinding BorderThickness}"
                              Padding="5,2,5,2"
                              CornerRadius="2">
                          <Border.RenderTransform>
                              <ScaleTransform x:Name="Button_ScaleTransform"
                                              CenterX="0.5"
                                              CenterY="0.5" />
                          </Border.RenderTransform>
                          <VisualStateManager.VisualStateGroups>
                              <VisualStateGroup>
                                  <VisualState x:Name="Normal" />

                                  <VisualState x:Name="Pressed">
                                      <Storyboard>
                                          <DoubleAnimationUsingKeyFrames Storyboard.TargetName="Button_Border"
                                                                         Storyboard.TargetProperty="RenderTransform.ScaleX">
                                              <EasingDoubleKeyFrame KeyTime="0:0:0.0" Value="0.9" />
                                          </DoubleAnimationUsingKeyFrames>
                                          <DoubleAnimationUsingKeyFrames Storyboard.TargetName="Button_Border"
                                                                         Storyboard.TargetProperty="RenderTransform.ScaleY">
                                              <EasingDoubleKeyFrame KeyTime="0:0:0.0" Value="0.9" />
                                          </DoubleAnimationUsingKeyFrames>
                                      </Storyboard>
                                  </VisualState>

                                  <VisualState x:Name="MouseOver" />
                                  <VisualState x:Name="Focused" />
                              </VisualStateGroup>
                          </VisualStateManager.VisualStateGroups>
                          <ContentPresenter />
                      </Border>
                  </ControlTemplate>
              </Setter.Value>
          </Setter>
      </Style>

Answer 1

我发现空的焦点事件（仅在单击按钮时触发）覆盖了按下事件。只需删除空的焦点事件，按下事件即可开始工作。