将 ControlTemplate 内的边框大小设置为按钮大小

Question

我想要几个按钮的 ControlTemplate，这样当鼠标悬停在按钮上时我可以控制按钮的颜色。问题是我使用边框作为 ControlTemplate 内容，并且我希望该边框的大小（BorderThickness）等于按钮的大小。由于按钮是网格的一部分，它的大小是灵活的。到目前为止，这是我的代码：

<Window x:Class="WPFTesting.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:WPFTesting"
    mc:Ignorable="d"
    Title="MainWindow" Height="400" Width="350">

<Window.Resources>
    <Style TargetType="Button" x:Key="ex">
        <Setter Property="Background" Value="Black"/>
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="FontSize" Value="50"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate>
                    <Border BorderBrush="{TemplateBinding Background}">
                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <Button Content="Btn0" Margin="0, 10, 0, 30" Style="{StaticResource ex}" Grid.Row="0"/>
    <Button Content="Btn1" Margin="0, 10, 0, 30" Grid.Row="1"/>
    <Button Content="Btn2" Margin="0, 10, 0, 30" Grid.Row="2"/> 
</Grid>

如何使 BorderThickness 填充整个网格行。我是否应该首先使用边框作为 ControlTemplate 内容？

Answer 1

你应该写

<ControlTemplate TargetType="Button">
    <Border Background="{TemplateBinding Background}"
            BorderBrush="{TemplateBinding BorderBrush}">
        <ContentPresenter
            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
    </Border>
</ControlTemplate>