我正在尝试覆盖按钮样式。实际上我已经做了几十次,但现在我遇到了这个:
异常和内部异常:{"属性在触发器中不能为空。
我的代码:
<Style x:Key="ArrowRightStyle" TargetType="{x:Type Button}">
<Setter Property="FocusVisualStyle" Value="{StaticResource ButtonFocusVisual}"/>
<Setter Property="Background" Value="{StaticResource ButtonNormalBackground}"/>
<Setter Property="BorderBrush" Value="{StaticResource ButtonNormalBorder}"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Padding" Value="1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid Height="{Binding ElementName=imgBackground, Path=ActualHeight, Mode=OneWay}"
Width="{Binding ElementName=imgBackground, Path=ActualWidth, Mode=OneWay}">
<Image x:Name="imgBackground" Source="{StaticResource RightArrowImageNormal}" Stretch="None"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="imgBackground" Property="Source" Value="{StaticResource RightArrowImageDisabled}"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="imgBackground" Property="Source" Value="{StaticResource RightArrowImageIsPressed}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
所以它有效:
<Style x:Key="ArrowRightStyle" TargetType="{x:Type Button}">
<Setter Property="FocusVisualStyle" Value="{StaticResource ButtonFocusVisual}"/>
<Setter Property="Background" Value="{StaticResource ButtonNormalBackground}"/>
<Setter Property="BorderBrush" Value="{StaticResource ButtonNormalBorder}"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Padding" Value="1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid Height="{Binding ElementName=imgBackground, Path=ActualHeight, Mode=OneWay}"
Width="{Binding ElementName=imgBackground, Path=ActualWidth, Mode=OneWay}">
<Image x:Name="imgBackground" Source="{StaticResource RightArrowImageNormal}" Stretch="None"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="imgBackground" Property="Source" Value="{StaticResource RightArrowImageDisabled}"/>
</Trigger>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=Self}, Path=IsPressed}" Value="True">
<Setter TargetName="imgBackground"
Property="Source" Value="{StaticResource RightArrowImageIsPressed}"/>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
为什么????
只是从快速查看来看,我认为它找不到属性 被压制
添加"按钮"应该这样做。
....
<Trigger Property="Button.IsPressed" Value="True">
<Setter TargetName="imgBackground" Property="Source" Value="{StaticResource....
或者确保您的模板面向按钮(我知道您在样式上指定了该按钮,但这还不够 - 模板将假定 typeof(Control) 并且控件上没有 IsPress。
...
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
....the rest of your code
我认为
{Binding RelativeSource={RelativeSource Mode=Self}, Path=IsPressed}"
在运行时将相对源的类型解析为"按钮",因此能够找到 IsPressed...