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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