自适应触发器和数据模板

AdaptiveTrigger and DataTemplate(自适应触发器和数据模板)

问题描述

AdaptiveTrigger 可以在 DataTemplate 中工作吗?

Will AdaptiveTrigger work in a DataTemplate?

这是我用来自定义 ShellNavigation 的代码，除了视觉状态外，它工作正常.他们不会触发任何事情.

That's my code i'm using to customize my ShellNavigation, it is working fine except the visual states. They will not trigger anything.

<shell:ShellHeadView x:Key="ShellHeadView_01">
    <shell:ShellHeadView.ContentTemplate>
        <DataTemplate>
            <Grid Margin="20,0">
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup>
                        <VisualState x:Name="GreenBackgroundVisualState">
                            <VisualState.Setters>
                                <Setter Target="headViewLeft.Background" Value="Green" />
                            </VisualState.Setters>
                            <VisualState.StateTriggers>
                                <AdaptiveTrigger MinWindowWidth="1000"/>
                            </VisualState.StateTriggers>
                        </VisualState>
                        <VisualState x:Name="OrangeBackgroundVisualState">
                            <VisualState.Setters>
                                <Setter Target="headViewLeft.Background" Value="Orange" />
                            </VisualState.Setters>
                            <VisualState.StateTriggers>
                                <AdaptiveTrigger MinWindowWidth="2000"/>
                            </VisualState.StateTriggers>
                        </VisualState>
                        <VisualState x:Name="RedBackgroundVisualState">
                            <VisualState.Setters>
                                <Setter Target="headViewLeft.Background" Value="Red" />
                            </VisualState.Setters>
                            <VisualState.StateTriggers>
                                <AdaptiveTrigger MinWindowWidth="3000"/>
                            </VisualState.StateTriggers>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>
                <Grid Grid.Column="0" x:Name="headViewLeft" Width="100" Height="90">

                </Grid>

推荐答案

尝试像这样将您的 DataTemplate 包装在 UserControl 中 -

Try wrapping your DataTemplate inside a UserControl like this -

<DataTemplate>
    <UserControl>
        <Grid>
            <VisualStateManager.VisualStateGroups>
            ...
        </Grid>
    </UserControl>
</DataTemplate>

<小时>

看起来任何具有 Content 属性的 Control 都可以工作.这就是 UserControl 起作用的原因，ContentControl 也是如此.

---

Looks like any Control that has got a Content property will work. That's why UserControl works, so does a ContentControl.

因此，如果您将 UserControl 替换为 ContentControl 并给它一个空的 Style.它也应该可以工作.

So if you replace the UserControl with a ContentControl and give it an empty Style. It should work too.

<Style x:Key="EmptyContentControlStyle" TargetType="ContentControl">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ContentControl" />
        </Setter.Value>
    </Setter>
</Style>

<DataTemplate>
    <ContentControl Style="{StaticResource EmptyContentControlStyle}">
        <Grid>
            <VisualStateManager.VisualStateGroups>
            ...
        </Grid>
    </ContentControl>
</DataTemplate>

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