我有一个 UWP 问题。禁用时如何更改按钮的样式(IsEnabled=False)?
2 回答
Microsoft 将VisualStateManager(来自 Silverlight)添加到 Windows 通用平台。其目的是为不同状态处理控件的外观。按钮的“禁用”状态就是一个很好的例子。控件的视觉状态在其 ControlTemplate 中定义。要自定义这些状态,最简单的方法是右键单击设计器中的按钮并选择“编辑模板”,然后选择“编辑副本...”。
这样做是将该控件的默认模板复制到所选位置。如果控件是 Button,您将拥有如下样式资源:
<Style x:Key="MyButtonStyle" TargetType="Button">
<Setter Property="Background" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
<Setter Property="BorderBrush" Value="{ThemeResource SystemControlForegroundTransparentBrush}"/>
<Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}"/>
<Setter Property="Padding" Value="8,4,8,4"/>
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
<Setter Property="FontWeight" Value="Normal"/>
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
<Setter Property="UseSystemFocusVisuals" Value="True"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid x:Name="RootGrid" Background="{TemplateBinding Background}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseMediumLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}"/>
</ObjectAnimationUsingKeyFrames>
<PointerDownThemeAnimation Storyboard.TargetName="RootGrid"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="RootGrid">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledTransparentBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
现在您可以看到 Button 的视觉状态以及与之关联的设置器/动画。您可以手动修改它们,也可以打开 Microsoft Blend 2015。它具有强大的视觉状态设计功能。右键单击您的按钮,然后在 Blend 中单击“编辑模板”->“编辑当前”,您可以在状态选项卡(左侧)上看到您的控件具有的所有状态。
当您选择“禁用”状态时,您将看到设计器窗口周围有一个红色边框。左上角的文字告诉您“已禁用状态记录...”。这意味着对控件树中对象的每次更改都会使控件的“禁用”状态。例如,您可以将 Contentpresenter 的前景色更改为禁用状态。以下动画将添加到您的 XAML:
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<SolidColorBrush Color="#FF225EFF"/>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
有关 VisualSateManager 以及从何处开始的更多信息,请查看Visual Studio 2015 中的新 XAML 工具和 Channel9 上的混合视频。
希望这会有所帮助
这是你如何做到的。
<StackPanel>
<Button x:Name="button" Content="Click Me"
IsEnabled="{Binding IsChecked, ElementName=checkBox}">
<Interactivity:Interaction.Behaviors>
<Core:DataTriggerBehavior Binding="{Binding IsEnabled,
ElementName=button, Mode=OneWay}" Value="True">
<Core:ChangePropertyAction PropertyName="Opacity" Value="1"/>
</Core:DataTriggerBehavior>
<Core:DataTriggerBehavior Binding="{Binding IsEnabled,
ElementName=button, Mode=OneWay}" Value="False">
<Core:ChangePropertyAction PropertyName="Opacity" Value=".5"/>
</Core:DataTriggerBehavior>
</Interactivity:Interaction.Behaviors>
</Button>
<CheckBox x:Name="checkBox" IsChecked="True" />
</StackPanel>
不要忘记您需要参考 Behaviors SDK。
祝你好运!