TemplateBinding到DependencyProperty上的自定义控件不起作用

本文关键字：自定义控件 不起作用 DependencyProperty TemplateBinding | 更新日期: 2023-09-27 18:19:00

目前，我正在制作一个简单的自定义按钮，它使用用户提供的图像作为按下和正常状态的背景。我有很多按钮，所以我决定写一个自定义按钮，并为按下和正常状态的图片实现两个属性。

下面是我使用的代码

public partial class ThemeableButton : Button
{
    public ThemeableButton()
    {
        InitializeComponent();
    }

    public static readonly DependencyProperty PressedContentBackgroundSourceProperty = DependencyProperty.Register(
                    "PressedContentBackgroundSource", typeof(ImageSource), typeof(ThemeableButton), null);
    public ImageSource PressedContentBackgroundSource
    {
        get { return (ImageSource)GetValue(PressedContentBackgroundSourceProperty); }
        set
        {
            (value as BitmapImage).CreateOptions = BitmapCreateOptions.BackgroundCreation; 
            SetValue(PressedContentBackgroundSourceProperty, value);
        }
    }

    public static readonly DependencyProperty NormalContentBackgroundSourceProperty =
        DependencyProperty.Register("NormalContentBackgroundSource", typeof(ImageSource), typeof(ThemeableButton), null);
    public ImageSource NormalContentBackgroundSource
    {
        get { return (ImageSource)GetValue(NormalContentBackgroundSourceProperty); }
        set
        {
            (value as BitmapImage).CreateOptions = BitmapCreateOptions.BackgroundCreation;
            SetValue(NormalContentBackgroundSourceProperty, value);
        }
    }
}

我为这个按钮写的样式如下

        <Style x:Key="ThemeableButtonTemplate" TargetType="MJbox_UIComponents_Controls:ThemeableButton">
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderBrush" Value="{StaticResource PhoneForegroundBrush}"/>
        <Setter Property="Foreground" Value="{StaticResource PhoneForegroundBrush}"/>
        <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>
        <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilySemiBold}"/>
        <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>
        <Setter Property="Padding" Value="0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="MJbox_UIComponents_Controls:ThemeableButton">
                    <Grid>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Source" Storyboard.TargetName="ButtonBackground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{TemplateBinding NormalContentBackgroundSource}">
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Source" Storyboard.TargetName="ButtonBackground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{TemplateBinding PressedContentBackgroundSource}">
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0">
                            <Image x:Name="ButtonBackground" Stretch="None" Source="{TemplateBinding NormalContentBackgroundSource}"/>
                        </Border>       
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

我试了一个简单的例子

<Controls:ThemeableButton Style="{StaticResource ThemeableButtonTemplate}" x:Name="btnDidntNeedIt" NormalContentBackgroundSource="{Binding Source={StaticResource DefaultTheme}, Path=DidntHaveButtonUnselected}"
                                   PressedContentBackgroundSource="{Binding Source={StaticResource DefaultTheme}, Path=DidntHaveButtonSelected}"
         />

但是图像没有显示，我尝试从样式中删除TemplateBinding并将其替换为图像文件的相对源，它工作得很好。我只是不想为应用程序上的每个按钮创建自定义样式。有什么可行的解决方案吗?

TemplateBinding到DependencyProperty上的自定义控件不起作用

我以前遇到过这种情况，TemplateBinding对控件上的自定义依赖属性不起作用。参见以下相关问题:

模板绑定和自定义组件绑定的问题

TemplateBinding在某些情况下不工作(当使用TranslateTransform时)

我一直用这个代替:

{Binding MyProperty, RelativeSource={RelativeSource TemplatedParent}}

它在语义上与TemplateBinding相同，并且还可以支持值转换器等…

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