本文告诉大家如何使用附加属性修改按钮按下去时的背景
先让大家看个图片，下面来告诉大家如何做
首先在后台创建一个附加属性
public class ButtonBrush
{
public static readonly DependencyProperty ButtonPressBackgroundProperty = DependencyProperty.RegisterAttached(
"ButtonPressBackground", typeof(Brush), typeof(ButtonBrush), new PropertyMetadata(default(Brush)));
public static void SetButtonPressBackground(DependencyObject element, Brush value)
{
element.SetValue(ButtonPressBackgroundProperty, value);
}
public static Brush GetButtonPressBackground(DependencyObject element)
{
return (Brush) element.GetValue(ButtonPressBackgroundProperty);
}
}
然后在 xaml 使用附加属性
<Button Margin="10,10,10,10"
Width="300" Height="100"
Content="确定"
local:ButtonBrush.ButtonPressBackground="#FFfcac1c" />
如何在按钮按下时使用这个附加属性修改按钮颜色？实际重写按钮的样式可以看到，在按下时可以修改颜色
<Style x:Key="Style.OkOperationButton"
TargetType="ButtonBase">
<Setter Property="Width" Value="110" />
<Setter Property="Height" Value="44" />
<Setter Property="FontSize" Value="24" />
<Setter Property="Background" Value="#FF0087FF" />
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border x:Name="Border" Width="{TemplateBinding Width}"
Height="{TemplateBinding Height}"
CornerRadius="22" Background="{TemplateBinding Background}">
<TextBlock x:Name="TextBlock"
Text="{TemplateBinding Content}"
FontSize="{TemplateBinding FontSize}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background"
Value="#FFfcac1c" />
<Setter TargetName="TextBlock" Property="Foreground" Value="#FFFFFFFF" />
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="#4D0087FF" />
<Setter TargetName="TextBlock" Property="Foreground" Value="#4DFFFFFF" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
那么如何在设置使用附加属性，实际上使用下面的代码直接从按钮获取附加属性
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background"
Value="{Binding RelativeSource = {RelativeSource Self},Path=(local:ButtonBrush.ButtonPressBackground)}" />
<Setter TargetName="TextBlock" Property="Foreground" Value="#FFFFFFFF" />
</Trigger>
所有的代码
<Window.Resources>
<Style x:Key="Style.OkOperationButton"
TargetType="ButtonBase">
<Setter Property="Width" Value="110" />
<Setter Property="Height" Value="44" />
<Setter Property="FontSize" Value="24" />
<Setter Property="Background" Value="#FF0087FF" />
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ButtonBase}">
<Border x:Name="Border" Width="{TemplateBinding Width}"
Height="{TemplateBinding Height}"
CornerRadius="22" Background="{TemplateBinding Background}">
<TextBlock x:Name="TextBlock"
Text="{TemplateBinding Content}"
FontSize="{TemplateBinding FontSize}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background"
Value="{Binding RelativeSource = {RelativeSource Self},Path=(local:ButtonBrush.ButtonPressBackground)}" />
<Setter TargetName="TextBlock" Property="Foreground" Value="#FFFFFFFF" />
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="#4D0087FF" />
<Setter TargetName="TextBlock" Property="Foreground" Value="#4DFFFFFF" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Button Margin="10,10,10,10" Style="{StaticResource Style.OkOperationButton}"
Width="300" Height="100"
Content="确定"
local:ButtonBrush.ButtonPressBackground="#FFfcac1c" />
</Grid>
代码：下载
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