Style.Triggers与ControlTemplate.Triggers

问题描述

何时应选择Style.Triggers，何时应选择ControlTemplate.Triggers?互相使用有什么好处吗?

When should I choose Style.Triggers and when should I choose ControlTemplate.Triggers? Are there any benefits using one over another?

说我有这些样式可以达到相同的结果:

Say I have these styles that achieve the same result:

<Style TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <ControlTemplate.Triggers>
                    ...
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style TargetType="{x:Type Button}">
    <Setter Property="Template">
        ...
    </Setter>
    <Style.Triggers>
        ...
    </Style.Triggers>
</Style>

推荐答案

更新，来自 Windows 8中的Button确实为IsMouseOver使用了ControlTemplate.Trigger，因此在某些情况下ControlTemplate可能需要完全覆盖才能获得所需的功能.因此，在这种情况下，您需要在样式触发器上使用ControlTemplate触发器.

Update from Background does not change of button C# WPF the Button in windows 8 does use a ControlTemplate.Trigger for IsMouseOver so there are cases where ControlTemplate may need to be completely overwritten to get the desired functionality. So that would be a case where you need to use ControlTemplate triggers over Style triggers.

您可能并不总是需要覆盖默认的ControlTemplate.假设您有一个控件，并且希望当IsMouseOver为true时，所有MyTextControl都具有一个蓝色的Foreground，并将其他所有内容保留为默认值.您可以使用类似这样的内容:

You may not always need to override the default ControlTemplate. Say you have a control and you want all the MyTextControl to have a a blue Foreground when IsMouseOver is true and leave everything else as default. You could use something like this:

<Style TargetType="{x:Type MyTextControl}">
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Foreground" Value="Blue"/>
        </Trigger>
    </Style.Triggers>
</Style>

如果要使用ControlTemplate.Triggers，则需要复制默认的MyTextControl Template，否则最终将没有视觉效果.

If you wanted to use the ControlTemplate.Triggers you would need to copy the default MyTextControl Template or else you would end up with no visual.

除此之外，我认为唯一的区别是Style.Triggers的优先级比ControlTemplate.Triggers(优先级文档).但这仅在同时使用两种触发器类型时才重要.

Aside from that I think the only difference is that Style.Triggers has a lower precedence than ControlTemplate.Triggers (Precedence documentation). But that would only matter if you use both trigger types.

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