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我有一个 WPF 应用程序,它有一个列表框,我正在尝试对其应用一些鼠标悬停效果。当我使用 simple Setters 更改鼠标悬停/选择的背景颜色时,一切正常,但我认为如果它在状态之间进行动画处理会更好看,所以我将Setters 切换为 enter/exit Storyboard。最初一切都很好(鼠标悬停动画进出,选择动画进出),但是一旦选择了某些东西然后被取消选择,它就再也不会做鼠标悬停效果了。

这是显示问题的最小代码示例:

<Window x:Class="WpfTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="500" Width="500">
  <Window.Resources>
    <Style x:Key="ListboxItemStyle" TargetType="{x:Type ListBoxItem}">
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="{x:Type ListBoxItem}">
            <Border x:Name="border" BorderThickness="1" Height="50" Background="#000">
              <ContentPresenter />
            </Border>
            <ControlTemplate.Triggers>
              <MultiTrigger>
                <MultiTrigger.Conditions>
                  <Condition Property="IsMouseOver" Value="True" />
                  <Condition Property="IsSelected" Value="False" />
                </MultiTrigger.Conditions>
                <MultiTrigger.EnterActions>
                  <BeginStoryboard>
                    <Storyboard>
                      <ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="border"
                          Storyboard.TargetProperty="Background.Color" To="#00F" />
                    </Storyboard>
                  </BeginStoryboard>
                </MultiTrigger.EnterActions>
                <MultiTrigger.ExitActions>
                  <BeginStoryboard>
                    <Storyboard>
                      <ColorAnimation Duration="0:0:0.3" Storyboard.TargetName="border"
                          Storyboard.TargetProperty="Background.Color" To="#008" />
                    </Storyboard>
                  </BeginStoryboard>
                </MultiTrigger.ExitActions>
              </MultiTrigger>
              <Trigger Property="IsSelected" Value="True">
                <Trigger.EnterActions>
                  <BeginStoryboard>
                    <Storyboard>
                      <ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="border"
                          Storyboard.TargetProperty="Background.Color" To="#F00" />
                    </Storyboard>
                  </BeginStoryboard>
                </Trigger.EnterActions>
                <Trigger.ExitActions>
                  <BeginStoryboard>
                    <Storyboard>
                      <ColorAnimation Duration="0:0:0.3" Storyboard.TargetName="border"
                          Storyboard.TargetProperty="Background.Color" To="#800" />
                    </Storyboard>
                  </BeginStoryboard>
                </Trigger.ExitActions>
              </Trigger>
            </ControlTemplate.Triggers>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Window.Resources>
  <Grid>
    <ListBox x:Name="ConnectedDevicesListBox"
        ItemContainerStyle="{DynamicResource ListboxItemStyle}" >
      <ListItem/>
      <ListItem/>
      <ListItem/>
      <ListItem/>
      <ListItem/>
      <ListItem/>
      <ListItem/>
      <ListItem/>
    </ListBox>
  </Grid>
</Window>

我已将退出动画淡化为非黑色,因此您可以看到它在IsSelected退出情节提要后卡住了。

有任何想法吗?

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1 回答 1

13

Storyboard 的默认行为是继续将属性值设置为动画最后一帧的值。请参阅动画提示和技巧,尤其是“动画后无法更改属性的值”部分。您永远不会停止情节提要,因此最终它们都在运行,并且最后声明的内容将设置最终值。

您可以将 Storyboard 的FillBehavior设置为 Stop,以便 Storyboard 在完成后停止设置该值。我认为您会希望在 ExitActions 故事板上执行此操作,而不是在 EnterAction 故事板上执行此操作,除非您还使用普通触发器设置了背景颜色。像这样的东西:

<MultiTrigger>
    <MultiTrigger.Conditions>
        <Condition Property="IsMouseOver" Value="True" />
        <Condition Property="IsSelected" Value="False" />
    </MultiTrigger.Conditions>
    <MultiTrigger.EnterActions>
        <BeginStoryboard>
            <Storyboard>
                <ColorAnimation Duration="0:0:0.15"
                    Storyboard.TargetName="border"
                    Storyboard.TargetProperty="Background.Color" To="#00F" />
            </Storyboard>
        </BeginStoryboard>
    </MultiTrigger.EnterActions>
    <MultiTrigger.ExitActions>
        <BeginStoryboard>
            <Storyboard FillBehavior="Stop">
                <ColorAnimation Duration="0:0:0.3"
                    Storyboard.TargetName="border"
                    Storyboard.TargetProperty="Background.Color" To="#008" />
            </Storyboard>
        </BeginStoryboard>
    </MultiTrigger.ExitActions>
</MultiTrigger>
<Trigger Property="IsSelected" Value="True">
    <Trigger.EnterActions>
        <BeginStoryboard>
            <Storyboard>
                <ColorAnimation Duration="0:0:0.15"
                    Storyboard.TargetName="border"
                    Storyboard.TargetProperty="Background.Color" To="#F00" />
            </Storyboard>
        </BeginStoryboard>
    </Trigger.EnterActions>
    <Trigger.ExitActions>
        <BeginStoryboard>
            <Storyboard FillBehavior="Stop">
                <ColorAnimation Duration="0:0:0.3"
                    Storyboard.TargetName="border"
                    Storyboard.TargetProperty="Background.Color" To="#800" />
            </Storyboard>
        </BeginStoryboard>
    </Trigger.ExitActions>
</Trigger>
于 2010-08-18T03:02:27.960 回答