如何在 UWP 应用程序中使用此 AdaptiveTrigger
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【中文标题】如何在 UWP 应用程序中使用此 AdaptiveTrigger【英文标题】:How to use this AdaptiveTrigger in UWP App 【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】:
【参考方案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!。非常感谢以上是关于如何在 UWP 应用程序中使用此 AdaptiveTrigger的主要内容,如果未能解决你的问题,请参考以下文章
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