Question

这是App.xaml中的Style：

        <Style x:Key="numButton" TargetType="{x:Type Button}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Image x:Name="img" Style="{DynamicResource imgDefault}"></Image>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter Property="Source" TargetName="img" Value="img/1_push.png"></Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Cursor" Value="Hand"></Setter>
        </Style>

        <Style x:Key="imgDefault" TargetType="{x:Type Image}">
            <Setter Property="Source" Value="img/0.png"></Setter>
        </Style>

我有多个按钮作为数字（0-9），我想为所有这些使用一种风格，以避免更多的文字输入。目前，我可以更改每个按钮的默认背景：

                <Button Name="btn1" Grid.Row="0" Grid.Column="0" Style="{DynamicResource numButton}" Foreground="White">
                    <Button.Resources>
                        <Style x:Key="imgDefault" TargetType="{x:Type Image}">
                            <Setter Property="Source" Value="img/1.png"></Setter>
                        </Style>
                    </Button.Resources>
                </Button>

所以现在我想知道是否可以在App.xaml中为每个按钮更改Value="img/1_push.png"？例如，当按下2时，我希望它的背景为2_push.png。

提前致谢。

Answer 1

您可以使用两个依赖项属性创建自定义Button类：

<强> ImageButton.cs：

namespace WpfApplication2
{
    public class ImageButton : System.Windows.Controls.Button
    {
        public static readonly DependencyProperty DefaultImageProperty =
             DependencyProperty.Register("DefaultImage", typeof(Uri), typeof(ImageButton));

        public Uri DefaultImage
        {
            get { return (Uri)GetValue(DefaultImageProperty); }
            set { SetValue(DefaultImageProperty, value); }
        }

        public static readonly DependencyProperty PressedImageProperty =
            DependencyProperty.Register("PressedImage", typeof(Uri), typeof(ImageButton));

        public Uri PressedImage
        {
            get { return (Uri)GetValue(PressedImageProperty); }
            set { SetValue(PressedImageProperty, value); }
        }
    }
}

<强> App.xaml中：

<Application x:Class="WpfApplication2.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:local="clr-namespace:WpfApplication2"
         StartupUri="Window1.xaml">
<Application.Resources>
    <Style TargetType="local:ImageButton">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:ImageButton}">
                    <Image x:Name="img" Source="{Binding DefaultImage,RelativeSource={RelativeSource TemplatedParent}, FallbackValue=img/0.png, TargetNullValue=img/0.png}" />
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter Property="Source" TargetName="img" Value="{Binding PressedImage, RelativeSource={RelativeSource TemplatedParent}, FallbackValue=img/1_push.png, TargetNullValue=img/1_push.png}"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Cursor" Value="Hand"></Setter>
    </Style>
</Application.Resources>

用法：

<local:ImageButton x:Name="btn1" Grid.Row="0" Grid.Column="0" Foreground="White"
                       DefaultImage="img/1.png" PressedImage="2_push.png"/>

这是一种更加清洁和灵活的方法。

Setter Value

1 个答案: