我的 WPF 应用程序中有一个动态按钮,单击弹出窗口应打开的任何一个按钮时,相应的按钮应将背景颜色变为橙色,其余按钮应使用 DataTrigger 默认背景颜色还有一种情况,在Popup关闭时,相应的Button Background Color应该变成Default Color。
Note: I Can't able to give Name for the Buttons because of Dynamic Creation. Here I placed 5 Buttons without Name Property, Consider the Button as Dynamic Creation
我的 XAML 源代码是
<Grid>
<Grid Height="30px" VerticalAlignment="Top" Margin="0,50,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100px"/>
<ColumnDefinition Width="100px"/>
<ColumnDefinition Width="100px"/>
<ColumnDefinition Width="100px"/>
<ColumnDefinition Width="100px"/>
</Grid.ColumnDefinitions>
<Button Content="One" Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75"/>
<Button Content="Two" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75"/>
<Button Content="Three" Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75"/>
<Button Content="Four" Grid.Column="3" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75"/>
<Button Content="Five" Grid.Column="4" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75"/>
</Grid>
<Grid>
<Popup Name="sPop" Placement="Mouse" StaysOpen="False">
<Grid>
<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" Text="Welcome to Popup Screen"/>
</Grid>
</Popup>
</Grid>
</Grid>
最佳答案
您不能使用 DataTriggers 来做到这一点。 DataTriggers 适用于基于数据的场景,因此如果您使用 DataBinding,请使用它们。
推荐方法:
为您的弹出窗口指定一个名称。并使用行为。
<Button ...>
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<Trigger Property="IsFocused" Value="True">
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<i:Interaction.Behaviors>
<ei:ConditionBehavior>
<ei:ConditionalExpression>
<ei:ComparisonCondition LeftOperand="{Binding IsFocused, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" RightOperand="True"/>
</ei:ConditionalExpression>
</ei:ConditionBehavior>
</i:Interaction.Behaviors>
<ei:ChangePropertyAction TargetObject="{Binding ElementName=Popup1}" PropertyName="IsOpen" Value="True"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
使用 Blend 程序集:
添加对 System.Windows.Interactivity
和 Microsoft.Expression.Interactions
以及以下命名空间的引用:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
还原源按钮的旧背景:
<Button>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<i:Interaction.Behaviors>
<ei:ConditionBehavior>
<ei:ConditionalExpression>
<ei:ComparisonCondition LeftOperand="{Binding IsFocused, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}" RightOperand="True"/>
</ei:ConditionalExpression>
</ei:ConditionBehavior>
</i:Interaction.Behaviors>
<!-- Store Button's old Background -->
<ei:ChangePropertyAction TargetObject="{Binding ElementName=Popup1}" PropertyName="Tag" Value="{Binding Background, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}"/>
<!-- Change Button's Background -->
<ei:ChangePropertyAction PropertyName="Background" Value="Purple"/>
<!-- Open Popup -->
<ei:ChangePropertyAction TargetObject="{Binding ElementName=Popup1}" PropertyName="IsOpen" Value="True"/>
<!-- Save this Button, Popup will use it to revert back its old Background -->
<ei:ChangePropertyAction TargetObject="{Binding ElementName=Popup1}" PropertyName="PlacementTarget" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Button}}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
<Popup x:Name="Popup1" Placement="Mouse" StaysOpen="False">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Closed">
<ei:ChangePropertyAction
TargetObject="{Binding PlacementTarget, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Popup}}"
PropertyName="Background"
Value="{Binding Tag, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Popup}}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<Grid>
<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" Text="Welcome to Popup Screen"/>
</Grid>
</Popup>
关于c# - 如何编写数据触发器以通过在 WPF 中单击动态按钮打开弹出窗口?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34304313/