如何在 UserControl 中使用 ContentPresenter

How to use a ContentPresenter inside a UserControl(如何在 UserControl 中使用 ContentPresenter)

问题描述

我想创建一个 UserControl(在本例中是一个带有已定义背景颜色的方形按钮)，它可以托管它自己的内容.

I'd like to create a UserControl (in this case a square-Button with defined Backgroundcolors) which can host it's own content.

用户控制:

<UserControl x:Class="SGDB.UI.Controls.ModernButton"
         xmlns:local="clr-namespace:SGDB.UI.Controls"
         xmlns:converter="clr-namespace:SGDB.UI.Converter"
         x:Name="_modernButton">
<Button>
    <Button.Resources>
        <converter:EnumToColorConverter x:Key="ColorConverter"/>
    </Button.Resources>
    <Button.Template>
        <ControlTemplate>
            <Border Width="{Binding Size, ElementName=_modernButton}" Height="{Binding Size, ElementName=_modernButton}" BorderBrush="Black" BorderThickness="0.8,0.8,3,3">
                <Grid Background="{Binding BackgroundColor, ElementName=_modernButton, Converter={StaticResource ColorConverter}}">
                    <ContentPresenter/>
                </Grid>
            </Border>
        </ControlTemplate>
    </Button.Template>
</Button>

现在，正如您所料，如果我在 MainView 中使用此控件，一切正常，直到我定义一些内容.

Now, as you may expect it, if I use this Control inside my MainView everthing works just fine until I define some Content.

使用:

<control:ModernButton Size="200" BackgroundColor="Light">
    TEST
</control:ModernButton>

在这种情况下，TEST"将覆盖 UserControl 的整个内容(整个按钮模板).我猜这是因为 UserControl 中的按钮本身被定义为内容"，并且在定义新内容时会被覆盖.

In this case "TEST" will override the whole Content of the UserControl (the whole Button Template). I guess this happens because The Button inside the UserControl is defined as "Content" itself and it will get overridden when defining new Content.

所以最后一个问题是:是否有可能实现我想要的?如果是:如何?如何将我在 MainView 中定义的内容重定向"到按钮模板内的自定义 ContentPresenter 而不是 UserControls 的 ContentPresenter?

So the final question is: Is it possible to achieve what I'm looking for? if yes: How? How could I "redirect" the Content I'm defining in my MainView into the self-defined ContentPresenter inside my Button Template instead of the UserControls's ContentPresenter?

如果可能，我不想创建一个新的 dp-propery 来托管我的内容，例如:

If possible I don't want to create a new dp-propery which hosts my Content, e.g.:

<controls:MordernButton Size="200" BackgroundColor="Light">
    <controls:ModernButton.Content>
        I don't want this, if possible
    </controls:ModernButton.Content>
</controls:ModernButton>

推荐答案

开始吧.

<UserControl x:Class="SGDB.UI.Controls.ModernButton"
     xmlns:local="clr-namespace:SGDB.UI.Controls"
     xmlns:converter="clr-namespace:SGDB.UI.Converter"
     x:Name="_modernButton">

    <UserControl.Template>
        <ControlTemplate TargetType="UserControl">
            <Button Content="{TemplateBinding Content}">
                 <Button.Resources>
                    <converter:EnumToColorConverter x:Key="ColorConverter"/>
                  </Button.Resources>
            <Button.Template >
                <ControlTemplate TargetType="Button">
                    <Border Width="{Binding Size,
                                    ElementName=_modernButton}"
                    Height="{Binding Size,
                                     ElementName=_modernButton}"
                    BorderBrush="Black"
                    BorderThickness="0.8,0.8,3,3">
                        <Grid Background="{Binding BackgroundColor, ElementName=_modernButton, Converter={StaticResource ColorConverter}}">
                            <ContentPresenter />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Button.Template>
            </Button>
        </ControlTemplate>
    </UserControl.Template>
</UserControl>

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