我正在使用下面的代码来设置 Menu 的样式。当 Mouse 位于菜单上 Over 时，我已经能够更改背景。但是我不知道如何在点击它时改变它的背景。
<Window x:Class="WpfApplication11.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>
<SolidColorBrush x:Key="NormalColor">White</SolidColorBrush>
<SolidColorBrush x:Key="HoverColor">LightGray</SolidColorBrush>
<SolidColorBrush x:Key="ClickedColor">DarkGray</SolidColorBrush>
<Style x:Key="{x:Type Menu}" TargetType="Menu">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Menu">
<Border x:Name="MainMenu" Background="{StaticResource NormalColor}"
BorderBrush="Black"
BorderThickness="1">
<StackPanel ClipToBounds="True" Orientation="Horizontal" IsItemsHost="True"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource HoverColor}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Menu Width="30" Height="20" Margin="10, 10, 5, 5" HorizontalAlignment="Left" Background="White">
<MenuItem Header="_File">
<MenuItem Header="_New"/>
<MenuItem Header="_Open"/>
<MenuItem Header="_Close"/>
</MenuItem>
</Menu>
</Grid>
</Window>
更新: 我已经尝试了以下代码，但它也没有用。
<Trigger Property="IsFocused" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource ClickedColor}"/>
</Trigger
最佳答案
您可以尝试使用 IsKeyboardFocusWithin。
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource ClickedColor}"/>
</Trigger>
这是添加了 IsKeyboardFocusWithin 触发器的代码。我将 ClickedColor 更改为紫色，以便更容易看到。我在您的菜单中添加了 Name="mm"。我添加了一个堆栈面板，其中的文本 block 绑定(bind)到 mm.IsFocused 和 mm.IsKeyboardFocusWithin，因此您可以直观地看到它们的设置以及更改时间。
<Window x:Class="WpfApplication11.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>
<SolidColorBrush x:Key="NormalColor">White</SolidColorBrush>
<SolidColorBrush x:Key="HoverColor">LightGray</SolidColorBrush>
<SolidColorBrush x:Key="ClickedColor">Purple</SolidColorBrush>
<Style x:Key="{x:Type Menu}" TargetType="Menu">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Menu">
<Border x:Name="MainMenu" Background="{StaticResource NormalColor}"
BorderBrush="Black"
BorderThickness="1">
<StackPanel ClipToBounds="True" Orientation="Horizontal" IsItemsHost="True"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource HoverColor}"/>
</Trigger>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource ClickedColor}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Menu Width="30" Height="20" Margin="10, 10, 5, 5" HorizontalAlignment="Left" Background="White" VerticalAlignment="Top" Name="mm">
<MenuItem Header="_File">
<MenuItem Header="_New"/>
<MenuItem Header="_Open"/>
<MenuItem Header="_Close"/>
</MenuItem>
</Menu>
<StackPanel VerticalAlignment="Center">
<TextBlock Text="menu.IsFocused:" />
<TextBlock Text="{Binding ElementName=mm, Path=IsFocused}" />
<TextBlock Text="menu.IsKeyboardFocusWithin:" />
<TextBlock Text="{Binding ElementName=mm, Path=IsKeyboardFocusWithin}" />
</StackPanel>
</Grid>
好的，对于菜单项...试试这个:
<Window x:Class="WpfApplication11.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>
<SolidColorBrush x:Key="NormalColor">White</SolidColorBrush>
<SolidColorBrush x:Key="HoverColor">LightGray</SolidColorBrush>
<SolidColorBrush x:Key="ClickedColor">Purple</SolidColorBrush>
<Style x:Key="{x:Type Menu}" TargetType="Menu">
<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Menu">
<Border x:Name="MainMenu" Background="{StaticResource NormalColor}"
BorderBrush="Black"
BorderThickness="1">
<StackPanel ClipToBounds="True" Orientation="Horizontal" IsItemsHost="True"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="MainMenu" Property="Background" Value="{StaticResource HoverColor}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ControlTemplate x:Key="MenuItemControlTemplate1" TargetType="{x:Type MenuItem}">
<Border x:Name="templateRoot" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
<Grid VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ContentPresenter x:Name="Icon" Content="{TemplateBinding Icon}" ContentSource="Icon" HorizontalAlignment="Center" Height="16" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" Width="16"/>
<Path x:Name="GlyphPanel" Data="F1M10,1.2L4.7,9.1 4.5,9.1 0,5.2 1.3,3.5 4.3,6.1 8.3,0 10,1.2z" Fill="{TemplateBinding Foreground}" FlowDirection="LeftToRight" Margin="3" Visibility="Collapsed" VerticalAlignment="Center"/>
<ContentPresenter ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Grid.Column="1" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Popup x:Name="PART_Popup" AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" Placement="Bottom">
<Border x:Name="SubMenuBorder" BorderBrush="#FF999999" BorderThickness="1" Background="#FFF0F0F0" Padding="2">
<ScrollViewer x:Name="SubMenuScrollViewer" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=SubMenuBorder}" Height="{Binding ActualHeight, ElementName=SubMenuBorder}" Width="{Binding ActualWidth, ElementName=SubMenuBorder}"/>
</Canvas>
<Rectangle Fill="#FFD7D7D7" HorizontalAlignment="Left" Margin="29,2,0,2" Width="1"/>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
</Grid>
</ScrollViewer>
</Border>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSuspendingPopupAnimation" Value="True">
<Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
</Trigger>
<Trigger Property="Icon" Value="{x:Null}">
<Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
<Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="True">
<Setter Property="Background" TargetName="templateRoot" Value="#3D26A0DA"/>
<Setter Property="BorderBrush" TargetName="templateRoot" Value="#FF26A0DA"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="#FF707070"/>
<Setter Property="Fill" TargetName="GlyphPanel" Value="#FF707070"/>
</Trigger>
<Trigger Property="CanContentScroll" SourceName="SubMenuScrollViewer" Value="False">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=SubMenuScrollViewer}"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=SubMenuScrollViewer}"/>
</Trigger>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter TargetName="templateRoot" Property="Background" Value="{StaticResource ClickedColor}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
<Grid>
<Menu Width="100" Height="20" Margin="10, 10, 5, 5" HorizontalAlignment="Left" Background="White" VerticalAlignment="Top">
<MenuItem Header="_File" Name="mm" Template="{DynamicResource MenuItemControlTemplate1}">
<MenuItem Header="_New"/>
<MenuItem Header="_Open"/>
<MenuItem Header="_Close"/>
</MenuItem>
<MenuItem Header="_Edit" Template="{DynamicResource MenuItemControlTemplate1}">
<MenuItem Header="_Copy"/>
<MenuItem Header="_Cut"/>
<MenuItem Header="_Paste"/>
</MenuItem>
</Menu>
<StackPanel VerticalAlignment="Center">
<TextBlock Text="menuitem.IsFocused:" />
<TextBlock Text="{Binding ElementName=mm, Path=IsFocused}" />
<TextBlock Text="menuitem.IsKeyboardFocusWithin:" />
<TextBlock Text="{Binding ElementName=mm, Path=IsKeyboardFocusWithin}" />
</StackPanel>
</Grid>
关于c# - 在 WPF 中单击时更改菜单背景，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24684392/