当鼠标在 wpf 中输入时设置椭圆描边（边框颜色）

Question

Ellipse有一个属性叫做IsMouseOver，我们可以用它来设置椭圆的颜色，就像this post一样。但实际上，当鼠标在上椭圆时，笔画会发生变化（图像我们画椭圆作为一个圆），当鼠标在里面椭圆（圆），颜色恢复原值。我知道ellipse有一个事件叫做MouseEnter，我们可以使用EventTrigger，但是在EventTrigger中只能设置StoryBoard。

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="10*" />
        <ColumnDefinition Width="90*" />
    </Grid.ColumnDefinitions>
    <Ellipse x:Name="checkButton" Grid.Column="0" Stroke="Black"></Ellipse>
    <TextBlock x:Name="txtContent" Grid.Column="1" FontWeight="Bold" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Center" TextAlignment="Center">
        <ContentPresenter />
    </TextBlock>
</Grid>
<ControlTemplate.Triggers>
    <EventTrigger RoutedEvent="MouseEnter">
        <BeginStoryboard></BeginStoryboard>
        // something like <Setter Property="Stroke" Value="Red" /> here
    </EventTrigger>
</ControlTemplate.Triggers>

我想要的只是当MouseEnter发生时，设置椭圆描边；当 MouseLeave 发生时，将其设置回去。有人有什么主意吗？

提前致谢！

Answer 1

试试这个：

<ControlTemplate.Triggers>
    <Trigger Property="IsMouseOver" Value="True">
        <Setter Property="Stroke" Value="Red" TargetName="checkButton"/>
    </Trigger>
</ControlTemplate.Triggers>

希望对您有所帮助:)

Answer 2

All I want is when MouseEnter happens, set ellipse stroke; when MouseLeave happens, set it back.

有几种方法可以做到这一点

使用简单风格的触发器和设置器

  <Ellipse Fill="White" StrokeThickness="10">
    <Ellipse.Style>
       <Style TargetType="{x:Type Ellipse}">
         <Setter Property="Stroke" Value="Red" />
           <Style.Triggers>
              <Trigger Property="IsMouseOver" Value="True">
                 <Setter Property="Stroke" Value="Green"/>
              </Trigger>
           </Style.Triggers>
       </Style>
   </Ellipse.Style>
</Ellipse>

使用混合行为（使用混合 SDK）

 <Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" 
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions" 
    Title="MainWindow" Height="350" Width="525">

<Grid x:Name="grid">
    <Ellipse x:Name="ellipse" HorizontalAlignment="Left" Height="100" Margin="109,116,0,0" Stroke="Black" VerticalAlignment="Top" Width="100">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseEnter">
                <ei:ChangePropertyAction PropertyName="Stroke">
                    <ei:ChangePropertyAction.Value>
                        <SolidColorBrush Color="Red"/>
                    </ei:ChangePropertyAction.Value>
                </ei:ChangePropertyAction>
            </i:EventTrigger>
            <i:EventTrigger EventName="MouseLeave">
                <ei:ChangePropertyAction PropertyName="Stroke">
                    <ei:ChangePropertyAction.Value>
                        <SolidColorBrush Color="Black"/>
                    </ei:ChangePropertyAction.Value>
                </ei:ChangePropertyAction>
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </Ellipse>
</Grid>

不要忘记添加对 Microsoft.Expressions.Interactions 和 System.Windows.Interaactivity

的引用

如果你在视觉上这样做会非常冗长studio.But如果你使用 Expresssion Blend 相信我，只需点击几下。

Answer 3

自定义复选框的完整解决方案：

<Window x:Class="WpfControlTemplates.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <ControlTemplate x:Key="CustomChkBox" TargetType="CheckBox">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="10*" />
                    <ColumnDefinition Width="90*" />
                </Grid.ColumnDefinitions>
                <Ellipse x:Name="checkButton" Grid.Column="0" Stroke="{TemplateBinding Property=BorderBrush}"></Ellipse>
                <TextBlock x:Name="txtContent" Grid.Column="1" FontWeight="Bold" Foreground="{TemplateBinding Property=Foreground}" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Center" TextAlignment="Center">
                    <ContentPresenter />
                </TextBlock>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter TargetName="checkButton" Property="Stroke" Value="Blue"/>
                    <Setter TargetName="checkButton" Property="Fill" Value="Gray"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

    </Window.Resources>

    <Grid>
        <CheckBox Template="{StaticResource CustomChkBox}" Width="100" Height="25" Foreground="Red" Content="Newsletters " Background="#FF16CF38" BorderBrush="#FF14C9C9"/>
    </Grid>
</Window>

使用 Storyboard 更改 Ellipse Stroke 属性：

技巧是设置 Stroke 属性不同，以便我们可以从 StoryBoard 访问它。 StoryBoard 没有任何用于 Brush 的动画，但它有一个用于 Color 的动画。

<Ellipse x:Name="checkButton" Grid.Column="1" StrokeThickness="5" Margin="82,0,61,0">

    <Ellipse.Stroke>
        <SolidColorBrush x:Name="StrokeColor" Color="Red"/>
    </Ellipse.Stroke>

    <Ellipse.Triggers>
         <EventTrigger RoutedEvent="MouseEnter">
         <BeginStoryboard  x:Name="EllipseSB">
           <Storyboard>
            <DoubleAnimation Storyboard.TargetProperty="StrokeThickness" To="10"/>
            <ColorAnimation Storyboard.TargetName="StrokeColor" Storyboard.TargetProperty="Color" To="Blue"/>
           </Storyboard>
         </BeginStoryboard>
         </EventTrigger>
         <EventTrigger RoutedEvent="MouseLeave">
             <StopStoryboard BeginStoryboardName="EllipseSB"/>
         </EventTrigger>

    </Ellipse.Triggers>
</Ellipse>

Answer 4

这是另一种解决方案

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="10*" />
        <ColumnDefinition Width="90*" />
    </Grid.ColumnDefinitions>
    <Ellipse x:Name="checkButton" Grid.Column="0" Stroke="Black" Fill="AliceBlue">
        <Ellipse.Style>
            <Style TargetType="{x:Type Ellipse}">
                <Style.Triggers>
                    <EventTrigger RoutedEvent="MouseEnter">
                        <EventTrigger.Actions>
                            <BeginStoryboard>
                                <Storyboard>
                                    <ColorAnimation Duration="0:0:0" 
                                                    Storyboard.TargetProperty="(Ellipse.Stroke).(SolidColorBrush.Color)" 
                                                    To="Red" AutoReverse="False"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger.Actions>
                    </EventTrigger>
                    <EventTrigger RoutedEvent="MouseLeave">
                        <EventTrigger.Actions>
                            <BeginStoryboard>
                                <Storyboard >
                                    <ColorAnimation Duration="0:0:0"
                                                    Storyboard.TargetProperty="(Ellipse.Stroke).(SolidColorBrush.Color)"
                                                    To="Black"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger.Actions>
                    </EventTrigger>
                </Style.Triggers>
            </Style>
        </Ellipse.Style>
    </Ellipse>
    <TextBlock x:Name="txtContent" Grid.Column="1" FontWeight="Bold" VerticalAlignment="Center" FontSize="14" HorizontalAlignment="Center" TextAlignment="Center">
    <ContentPresenter />
    </TextBlock>
</Grid>

当鼠标在 wpf 中输入时设置椭圆描边（边框颜色）

set ellipse stroke(border color) when mouse enters it in wpf

c#

wpf

eventtrigger