C# WPF只访问具有dependency属性的派生类的单个实例
我有一个从Button派生的简单类,它具有一个依赖属性:C# WPF只访问具有dependency属性的派生类的单个实例,c#,wpf,xaml,dependency-properties,C#,Wpf,Xaml,Dependency Properties,我有一个从Button派生的简单类,它具有一个依赖属性: public sealed class CircleButton : Button { public Visual Visual { get { return (Visual)GetValue(VisualProperty); } set { SetValue(VisualProperty, value); } } public static readonly Depend
public sealed class CircleButton : Button
{
public Visual Visual
{
get { return (Visual)GetValue(VisualProperty); }
set { SetValue(VisualProperty, value); }
}
public static readonly DependencyProperty VisualProperty = DependencyProperty.Register("Visual", typeof(Visual), typeof(CircleButton));
}
圆形按钮的样式如下:
<Style x:Key="CircleButtonStyle" TargetType="{x:Type controls1:CircleButton}">
...
<Setter Property="Content">
<Setter.Value>
<Rectangle Style="{StaticResource CircleButtonRectangleStyle}"/>
</Setter.Value>
</Setter>
...
</Style>
...
...
圆形按钮样式中引用的矩形样式定义为:
<Style x:Key="CircleButtonRectangleStyle" TargetType="{x:Type Rectangle}">
<Setter Property="Width" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Width, Converter={StaticResource ArithmeticConverter}}"/>
<Setter Property="Height" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Height, Converter={StaticResource ArithmeticConverter}}"/>
<Setter Property="Fill" Value="White"/>
<Setter Property="OpacityMask">
<Setter.Value>
<VisualBrush Visual="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Visual}"/>
</Setter.Value>
</Setter>
</Style>
最后,我的XAML定义了三个CircleButton实例:
<StackPanel Grid.Row="1" Grid.Column="2">
<controls:CircleButton HorizontalAlignment="Center" VerticalAlignment="Center" Width="30.0" Height="30.0"
Style="{DynamicResource CircleButtonStyle}" Command="{Binding Add}" ToolTip="Add new product filter." BorderBrush="White" BorderThickness="1"
Background="{DynamicResource AccentColorBrush}" Visual="{DynamicResource appbar_add}"/>
<controls:CircleButton HorizontalAlignment="Center" VerticalAlignment="Center" Width="30.0" Height="30.0"
Style="{DynamicResource CircleButtonStyle}" Command="{Binding Remove}" ToolTip="Remove product filter." BorderBrush="White" BorderThickness="1"
Background="{DynamicResource AccentColorBrush}" Visual="{DynamicResource appbar_minus}"/>
<controls:CircleButton HorizontalAlignment="Center" VerticalAlignment="Center" Width="30.0" Height="30.0"
Style="{DynamicResource CircleButtonStyle}" Command="{Binding Remove}" ToolTip="Remove product filter." BorderBrush="White" BorderThickness="1"
Background="{DynamicResource AccentColorBrush}" Visual="{DynamicResource appbar_music}"/>
</StackPanel>
所有三个按钮都会显示,但只有序列中的最后一个按钮有图像(它是正确的)。无论我添加多少按钮,都会发生这种情况
有人看到我遗漏了什么以及我需要做什么来纠正吗?这并不明显,但事实上,您只定义了一个
VisualBrush
实例。该Setter.Value
元素的内容将只有一个副本。每次它被添加到你的一个圆圈按钮上,它就会从上一个按钮中被拉出
请尝试应用模板,并将该可视笔刷应用于模板中的元素。每次应用模板时,都会单独创建模板中的元素
现在,您不能将控制模板
应用于矩形
。但是你可以在很多事情上应用很多模板,所以没什么大不了的
这可能有用Button
是ContentControl
的子类,因此它有一个ContentTemplate
属性,该属性被实例化以显示您在按钮的内容属性中放置的任何内容。这个用法有点可笑,因为它不显示内容
——但您没有使用内容
<Style x:Key="CircleButtonStyle" TargetType="{x:Type controls1:CircleButton}">
<!-- ... -->
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Rectangle
Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Width, Converter={StaticResource ArithmeticConverter}}"
Height="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Height, Converter={StaticResource ArithmeticConverter}}"
Fill="White"
>
<Rectangle.OpacityMask>
<VisualBrush Visual="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls1:CircleButton}}, Path=Visual}"/>
</Rectangle.OpacityMask>
</Rectangle>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
谢谢,让我调查一下。矩形似乎不允许使用ControlTemplate定义,但可能有一种方法可以直接在CircleButton样式中执行此操作。@您不需要为矩形设置模板。您模板化的内容项可以是任何可以模板化的内容,因为您正在替换其内容ContentControl
就可以了。@ket更新了一个样式,可能可以完成这项工作。太棒了-真管用!非常感谢。我本可以花很多时间想办法弄明白的。我很高兴听到这个消息!
<Style x:Key="CircleButtonStyle" TargetType="{x:Type Button}">
<!-- ... -->
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Rectangle
Width="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}, Path=Width, Converter={StaticResource ArithmeticConverter}}"
Height="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}, Path=Height, Converter={StaticResource ArithmeticConverter}}"
Fill="White"
>
<Rectangle.OpacityMask>
<VisualBrush Visual="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}, Path=Content}"/>
</Rectangle.OpacityMask>
</Rectangle>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
<!-- ... -->
<Button
Style="{DynamicResource CircleButtonStyle}"
Command="{Binding Remove}"
ToolTip="Remove product filter."
Content="{DynamicResource appbar_music}"
/>