在WPF中，我怎么了当前主题的按钮背景？ [英] In WPF, how do I get the current theme's button background?

问题描述

在我的WPF应用程序，我需要获得主题的按钮背景画笔画出另一个控制的背景。

In my wpf application, I need to get the theme's button background brush to draw the background of another control.

我曾尝试引用PresentationFramework.Aero.dll和使用ButtonChrome，但至今没有运气。

I have tried referencing PresentationFramework.Aero.dll and using ButtonChrome, but no luck so far.

我使用VisualStyleRenderer也尝试过，但似乎这个类只能用于绘制背景（我可以'吨得到画笔，将其设置为另一个控件的背景）。

I've tried using VisualStyleRenderer also, but it seems that this class can be used only to draw the background (I can't get a brush and set it as the background of another control).

任何想法？

亲切的问候，
·爱德华多·梅洛

Kind Regards, Eduardo Melo

推荐答案

可以在代码中通过查找资源的默认按钮样式做的：

It can be done in code by looking up the default button style in the resources :

    private static object GetValueFromStyle(object styleKey, DependencyProperty property)
    {
        Style style = Application.Current.TryFindResource(styleKey) as Style;
        while (style != null)
        {
            var setter =
                style.Setters
                    .OfType<Setter>()
                    .FirstOrDefault(s => s.Property == property);

            if (setter != null)
            {
                return setter.Value;
            }

            style = style.BasedOn;
        }
        return null;
    }

    ...

    this.Background = GetValueFromStyle(typeof(Button), BackgroundProperty) as Brush;

如果您需要做的是在XAML中，你可以轻松地创建从上面的代码标记扩展：

If you need to do it in XAML, you can easily create a markup extension from the code above:

public class ValueFromStyleExtension : MarkupExtension
{
    public ValueFromStyleExtension()
    {
    }

    public object StyleKey { get; set; }
    public DependencyProperty Property { get; set; }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        if (StyleKey == null || Property == null)
            return null;
        object value = GetValueFromStyle(StyleKey, Property);
        if (value is MarkupExtension)
        {
            return ((MarkupExtension)value).ProvideValue(serviceProvider);
        }
        return value;
    }

    private static object GetValueFromStyle(object styleKey, DependencyProperty property)
    {
        Style style = Application.Current.TryFindResource(styleKey) as Style;
        while (style != null)
        {
            var setter =
                style.Setters
                    .OfType<Setter>()
                    .FirstOrDefault(s => s.Property == property);

            if (setter != null)
            {
                return setter.Value;
            }

            style = style.BasedOn;
        }
        return null;
    }
}

XAML

Background="{util:ValueFromStyle StyleKey={x:Type Button}, Property=Control.Background}">

---

编辑为在那里的值被定义为 DynamicResource （或另一个ME）

---

fixed ValueFromStyleExtension for the case where the value is defined as a DynamicResource (or another ME)

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