[英]Trigger/Setter on dependency property reached by Binding
我想設置一個我在Class1
中聲明的從DependencyObject
繼承的依賴項屬性:
public static readonly DependencyProperty MyMouseOverProperty = DependencyProperty.Register("MyMouseOver", typeof(bool), typeof(Class1),
new PropertyMetadata(false,new PropertyChangedCallback(On_MyMouseOver)));
private static void On_MyMouseOver(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// some code here
}
public bool MyMouseOver
{
get { return (bool)GetValue(MyMouseOverProperty); }
set { SetValue(MyMouseOverProperty, value); }
}
我將在XAML中使用“ MyMouseOver”,以便在“ On_MyMouseOver”中使用其狀態來影響另一個對象。
<DataTemplate DataType="{x:Type local:Class1}">
<Canvas x:Name="Canvas_Classe1"
Background="Transparent">
<Canvas.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="{Binding Path=MyMouseOver}" Value="True"/>
</Trigger>
</Canvas.Triggers>
</Canvas>
但是...這不起作用。 如何使用Setter
訪問不是在控件中而是在類中聲明的DependencyProperty
?
您可以使用附加屬性來完成此操作
public class Class1
{
public static readonly DependencyProperty MyMouseOverProperty = DependencyProperty.RegisterAttached(
"MyMouseOver", typeof(bool), typeof(Class1), new FrameworkPropertyMetadata(false, PropertyChangedCallback)
);
public static void SetMyMouseOver(UIElement element, Boolean value)
{
element.SetValue(MyMouseOverProperty, value);
}
public static bool GetMyMouseOver(UIElement element)
{
return (bool)element.GetValue(MyMouseOverProperty);
}
private static void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// some code here
}
}
在DataTemplate IsMouseOver上設置附加屬性
<DataTemplate DataType="{x:Type local:Class1}">
<Canvas x:Name="Canvas_Classe1"
Background="Black">
</Canvas>
<DataTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="local:Class1.MyMouseOver" Value="True"/>
</Trigger>
</DataTemplate.Triggers>
</DataTemplate>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.