我试图在鼠标悬浮在按钮上时更改默认边框颜色,但无法使其起作用。我认为以下代码可以正常工作,但显然不行:
<Button>
<Button.Resources>
<Color x:Key="ControlMouseOverColor">somecolor</Color>
</Button.Resources>
</Button>
有没有什么方法可以做到这一点?
这是WPF中需要完成简单事情时需要进行稍微复杂的操作之一 :)。实际上,您需要覆盖Button控件的ControlTemplate,因为当鼠标悬停在按钮上时,边框颜色是由默认ControlTemplate确定的。下面是具有默认ControlTemplate的按钮,减去了设置IsMouseOver为红色的setter:
<Button>
<Button.Template>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
<ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="Button.IsDefaulted" Value="True">
<Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" TargetName="border" Value="#FFBEE6FD"/>
<Setter Property="BorderBrush" TargetName="border" Value="Red"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background" TargetName="border" Value="#FFC4E5F6"/>
<Setter Property="BorderBrush" TargetName="border" Value="#FF2C628B"/>
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Background" TargetName="border" Value="#FFBCDDEE"/>
<Setter Property="BorderBrush" TargetName="border" Value="#FF245A83"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Background" TargetName="border" Value="#FFF4F4F4"/>
<Setter Property="BorderBrush" TargetName="border" Value="#FFADB2B5"/>
<Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="#FF838383"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
Click
</Button>
<Button>
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="BorderBrush" Value="Black"></Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="Red"></Setter>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
属性触发器旨在在条件变为真时做出反应,但当该条件变为假时恢复其先前状态。因此,我们在这里说:当IsMouseOver属性变为true时,将定义的按钮的边框刷成红色。当条件变为false时,它将恢复为黑色(我不确定边框刷的默认颜色是什么,所以您可以删除第4行)。