在 uwp 中的 fontIcon 上模拟鼠标悬停效果

Question

我目前正在处理涉及使用汉堡菜单的 uwp 项目。到目前为止，我使用此代码生成了菜单

<FontIcon FontFamily="Segoe MDL2 Assets" Glyph="&#xE700;"
                      Foreground="Black" VerticalAlignment="Center" Margin="12,0,8,0">

我真正要实现的是当鼠标悬停在图标上时，汉堡包菜单的背景颜色预计会发生变化。这类似于 windows 应用程序中的最小化按钮。在搜索 API 之后，我意识到没有任何鼠标悬停事件，我认为最接近它的是 PointerEnetered 事件。如何使用 XAML 中的 PointerEntered 事件实现此目的？

Answer 1

更新你不能在 XAMl 中做到这一点。如果您想在 XAMl 中执行，请改用按钮并编辑按钮的视觉状态

 <Button Foreground="Black" Style="{StaticResource ButtonStyle1}">
                <FontIcon FontFamily="Segoe MDL2 Assets" Glyph="&#xE700;" 
     VerticalAlignment="Center" Margin="12,0,8,0"/>
            </Button>

 <Style x:Key="ButtonStyle1" TargetType="Button">
            <Setter Property="Background" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
            <Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
            <Setter Property="BorderBrush" Value="{ThemeResource SystemControlForegroundTransparentBrush}"/>
            <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}"/>
            <Setter Property="Padding" Value="8,4,8,4"/>
            <Setter Property="HorizontalAlignment" Value="Left"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
            <Setter Property="FontWeight" Value="Normal"/>
            <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
            <Setter Property="UseSystemFocusVisuals" Value="True"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Grid x:Name="RootGrid" Background="{TemplateBinding Background}">
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal">
                                        <Storyboard>
                                            <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="PointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="White"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseMediumLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <PointerDownThemeAnimation Storyboard.TargetName="RootGrid"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledTransparentBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

你可以这样做

     <FontIcon FontFamily="Segoe MDL2 Assets" Glyph="&#xE700;" PointerPressed="FontIcon_PointerPressed" PointerEntered="FontIcon_PointerEntered"
    PointerExited="FontIcon_PointerExited"    Foreground="Black" VerticalAlignment="Center" Margin="12,0,8,0"/>

   private void FontIcon_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            (sender as FontIcon).Foreground = new SolidColorBrush(Colors.White);
        }

        private void FontIcon_PointerEntered(object sender, PointerRoutedEventArgs e)
        {
            (sender as FontIcon).Foreground = new SolidColorBrush(Colors.White);
        }

        private void FontIcon_PointerExited(object sender, PointerRoutedEventArgs e)
        {
            (sender as FontIcon).Foreground = new SolidColorBrush(Colors.Black);
        }

Answer 2

除了@Archana 发布的更改 FontIcon 前景色的解决方案外，还更改了汉堡包菜单的背景色，使其类似于 windows 中的最小化按钮应用程序，我们可以尝试将 FontIcon xaml 添加到 Button 的内容中，并更改 Button 的背景颜色，让它看起来像我们已经更改了汉堡包菜单的背景颜色。

对于鼠标悬停事件的处理，如您所说，我们需要使用PointerEnetered事件。但是请不要忘记处理PointerExited事件，让汉堡菜单的背景颜色在我们没有将鼠标移到汉堡菜单上后恢复正常。

更多信息，请查看我的示例：

XAML代码：

 <SplitView.Pane>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <StackPanel Grid.Row="0" Height="auto">
                    <Button BorderThickness="0" Background="Transparent" PointerEntered="Button_PointerEntered" PointerExited="Button_PointerExited">
                        <Button.Content>
                            <FontIcon FontFamily="Segoe MDL2 Assets" Glyph="&#xE700;"
                  Foreground="Black" VerticalAlignment="Center" Margin="12,0,8,0"/>
                        </Button.Content>
                    </Button>
                </StackPanel>
                <StackPanel Grid.Row="1">
                 //add other icon
                </StackPanel>
            </Grid>
        </SplitView.Pane>

CS 码：

private void Button_PointerEntered(object sender, PointerRoutedEventArgs e)
    {
        Button test = sender as Button;
        test.Background = new SolidColorBrush(Colors.Red);
    }

    private void Button_PointerExited(object sender, PointerRoutedEventArgs e)
    {
        Button test = sender as Button;
       test.Background = new SolidColorBrush(Colors.Transparent);
    }

如果只想用XAML实现，请右击Button编辑Button样式，更改Button里面的Button背景颜色PointerOver VisualState 如下：

 <VisualState x:Name="PointerOver">
             <Storyboard>
                  <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                         <DiscreteObjectKeyFrame KeyTime="0" Value="Red"/>
                   </ObjectAnimationUsingKeyFrames>
                                                                          </Storyboard>
</VisualState>

完整的XAML代码，请查看：

 <Page.Resources>
    <Style x:Key="ButtonStyle1" TargetType="Button">
        <Setter Property="Background" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
        <Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
        <Setter Property="BorderBrush" Value="{ThemeResource SystemControlForegroundTransparentBrush}"/>
        <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}"/>
        <Setter Property="Padding" Value="8,4,8,4"/>
        <Setter Property="HorizontalAlignment" Value="Left"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
        <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
        <Setter Property="FontWeight" Value="Normal"/>
        <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
        <Setter Property="UseSystemFocusVisuals" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid x:Name="RootGrid" Background="{TemplateBinding Background}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal">
                                    <Storyboard>
                                        <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="PointerOver">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="Red"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumLowBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <PointerUpThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseMediumLowBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <PointerDownThemeAnimation Storyboard.TargetName="RootGrid"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseMediumLowBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledTransparentBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Page.Resources>

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <SplitView.Pane>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <StackPanel Grid.Row="0" Height="auto">
                    <Button BorderThickness="0" Background="Transparent" Style="{StaticResource ButtonStyle1}" PointerEntered="Button_PointerEntered" PointerExited="Button_PointerExited">
                        <Button.Content>
                            <FontIcon FontFamily="Segoe MDL2 Assets" Glyph="&#xE700;"
                  Foreground="Black" VerticalAlignment="Center" Margin="12,0,8,0"/>
                        </Button.Content>
                    </Button>
                </StackPanel>
                <StackPanel Grid.Row="1">
                 //add other icon
                </StackPanel>
            </Grid>
        </SplitView.Pane>

    </Grid>
</Grid>

结果：

谢谢。

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