如何在 UWP 应用程序中使用此 AdaptiveTrigger答案

【问题标题】：How to use this AdaptiveTrigger in UWP App如何在 UWP 应用程序中使用此 AdaptiveTrigger
【发布时间】：2016-12-09 05:42:33
【问题描述】：

我正在编写一个 UWP 应用程序。

我在页面中添加了 SplitView（用于汉堡包）。

在SplitView Pane中，我有两个项目：

SellButtonGrid
SellButtonGridAlternate

以上两项的可见性取决于两个条件：

至少 520 个窗口高度
SplitViewPane 打开或关闭。

这意味着 4 个案例：

窗口高度小于 520 且拆分视图已关闭

窗口高度小于 520 且 splitviewpane 已打开

窗口高度大于 520 且 splitviewpane 关闭

窗口高度大于 520 且 splitviewpane 已打开

对于 splitview 打开或关闭我使用：

<VisualState x:Name="SplitViewOpen">
  <VisualState.StateTriggers>
  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen}" />
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Visible" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Collapsed" />
  </VisualState.Setters>
</VisualState>
<VisualState x:Name="SplitViewClosed">
  <VisualState.StateTriggers>
  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen, Converter={StaticResource BooleanNegationConverter}}" />
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
  </VisualState.Setters>
</VisualState>

为了检测低于或高于 520 的高度，我使用：

<VisualState x:Name="SmallHeight">
  <VisualState.StateTriggers>
  <AdaptiveTrigger MinWindowHeight="0" />
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
  </VisualState.Setters>
</VisualState>
<VisualState x:Name="LargeHeight">
  <VisualState.StateTriggers>
  <AdaptiveTrigger MinWindowHeight="520" />
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Visible" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Collapsed" />
  </VisualState.Setters>
</VisualState>

但是，结果不是我所期望的。如何合并这些视觉状态？？

我尝试使用： http://dotnetbyexample.blogspot.in/2016/02/an-adaptivetrigger-that-works-with.html

我使用了上述解决方案，所以： 我重新编写的代码：

xmlns:Utils="using:DellApp.Utils"
xmlns:converters="using:DellApp.Converters"
xmlns:windowsStateTriggers="using:WindowsStateTriggers"

新创建的状态：

  <VisualState.StateTriggers>
  <windowsStateTriggers:CompositeStateTrigger>
  <Utils:AdaptiveTrigger MinWindowHeight="520" MaxWindowHeight="18000" />

  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen,
  Converter={StaticResource BooleanNegationConverter}}" />
  </windowsStateTriggers:CompositeStateTrigger>
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
  </VisualState.Setters>
</VisualState>

<VisualState x:Name="SplitViewCollapsed_SmallHeight">
  <VisualState.StateTriggers>
  <windowsStateTriggers:CompositeStateTrigger>
  <Utils:AdaptiveTrigger MaxWindowHeight="519"
  MinWindowHeight="0" />
  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen,
  Converter={StaticResource BooleanNegationConverter}}" />
  </windowsStateTriggers:CompositeStateTrigger>
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
  </VisualState.Setters>
</VisualState>

<VisualState x:Name="SplitViewOpen_SmallHeight">
  <VisualState.StateTriggers>
  <windowsStateTriggers:CompositeStateTrigger>
  <Utils:AdaptiveTrigger MaxWindowHeight="519"
  MinWindowHeight="0" />
  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen}" />
  </windowsStateTriggers:CompositeStateTrigger>
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
  </VisualState.Setters>
</VisualState>

<VisualState x:Name="SplitViewOpen_LargeHeight">
  <VisualState.StateTriggers>
  <windowsStateTriggers:CompositeStateTrigger>
  <Utils:AdaptiveTrigger MinWindowHeight="520" MaxWindowHeight="18000"/>
  <StateTrigger IsActive="{Binding ElementName=LayoutSplitView,
  Path=IsPaneOpen}" />
  </windowsStateTriggers:CompositeStateTrigger>
  </VisualState.StateTriggers>
  <VisualState.Setters>
  <Setter Target="SellButtonGrid.Visibility" Value="Visible" />
  <Setter Target="SellButtonGridAlternate.Visibility" Value="Collapsed" />
  </VisualState.Setters>
</VisualState>

所以，我所做的是，我添加了CompositeStateTrigger from WindowsStateTriggers，但我无法触发它。

【问题讨论】：

标签： c# xaml windows-phone-8.1 uwp windows-10-universal

【解决方案1】：

我用你的代码做了一个演示并重现了这个问题。经过研究，我发现了以下问题：

Binding 不适用于 StateTrigger。但是x:Bind 工作得很好，所以你可以改用x:Bind，不要忘记为x:Bind 指定Mode=OneWay。
Operator="And" 需要在windowsStateTriggers:CompositeStateTrigger 上指定。

所以你的 XAML 应该像下面这样修复：

<Page.Resources>
    <converter:BooleanNegationConverter x:Name="BooleanNegationConverter" x:Key="BooleanNegationConverter"/>
</Page.Resources>

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <VisualStateManager.VisualStateGroups>
        <VisualStateGroup>
            <VisualState>
                <VisualState.StateTriggers>
                <windowsStateTriggers:CompositeStateTrigger Operator="And">//use Operator='And' here
                        <Utils:AdaptiveTrigger MinWindowHeight="520" MaxWindowHeight="18000" />
                        <StateTrigger IsActive="{x:Bind LayoutSplitView.IsPaneOpen,Mode=OneWay,Converter={StaticResource BooleanNegationConverter}}" />
                </windowsStateTriggers:CompositeStateTrigger>
            </VisualState.StateTriggers>
            <VisualState.Setters>
                <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
                <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
            </VisualState.Setters>
            </VisualState>

            <VisualState x:Name="SplitViewCollapsed_SmallHeight">
                <VisualState.StateTriggers>
                    <windowsStateTriggers:CompositeStateTrigger Operator="And">
                        <Utils:AdaptiveTrigger MaxWindowHeight="519" MinWindowHeight="0" />
                        <StateTrigger IsActive="{x:Bind LayoutSplitView.IsPaneOpen,Mode=OneWay,Converter={StaticResource BooleanNegationConverter}}" />
                    </windowsStateTriggers:CompositeStateTrigger>
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
                    <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
                </VisualState.Setters>
            </VisualState>

            <VisualState x:Name="SplitViewOpen_SmallHeight">
                <VisualState.StateTriggers>
                    <windowsStateTriggers:CompositeStateTrigger Operator="And">
                        <Utils:AdaptiveTrigger MaxWindowHeight="519" MinWindowHeight="0" />
                        <StateTrigger IsActive="{x:Bind LayoutSplitView.IsPaneOpen}" />
                    </windowsStateTriggers:CompositeStateTrigger>
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="SellButtonGrid.Visibility" Value="Collapsed" />
                    <Setter Target="SellButtonGridAlternate.Visibility" Value="Visible" />
                </VisualState.Setters>
            </VisualState>

            <VisualState x:Name="SplitViewOpen_LargeHeight">
                <VisualState.StateTriggers>
                    <windowsStateTriggers:CompositeStateTrigger Operator="And">
                        <Utils:AdaptiveTrigger MinWindowHeight="520" MaxWindowHeight="18000"/>
                        <StateTrigger IsActive="{x:Bind LayoutSplitView.IsPaneOpen}" />
                    </windowsStateTriggers:CompositeStateTrigger>
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="SellButtonGrid.Visibility" Value="Visible" />
                    <Setter Target="SellButtonGridAlternate.Visibility" Value="Collapsed" />
                </VisualState.Setters>
            </VisualState>
        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>

这是我制作的示例：AdaptiveTriggerSample

【讨论】：

是的，成功了！。非常感谢