有两个问题。
首先,您的 DataTrigger 绑定看起来不正确。他们正在 DataContext 上查找 IsButtonMouseOver,而不是关联的控件。你需要使用:
<DataTrigger Binding="{Binding IsButtonMouseOver, RelativeSource={RelativeSource Self}}" Value="True">
<Setter Property="ButtonStyle" Value="Black"/>
<Setter Property="ComboStyle" Value="Red"/>
</DataTrigger>
Or:
<Trigger Property="IsButtonMouseOver" Value="True">
<Setter Property="ButtonStyle" Value="Black"/>
<Setter Property="ComboStyle" Value="Red"/>
</Trigger>
另一个是你的 IsButtonMouseOver 没有正确实现。你应该做类似的事情:
public static readonly DependencyProperty IsButtonMouseOverProperty = DependencyProperty.Register("IsButtonMouseOver",
typeof(bool), typeof(ToolbarButtonCombo), new PropertyMetadata(false));
public bool IsButtonMouseOver
{
get { return (bool)this.GetValue(IsButtonMouseOverProperty); }
set { this.SetValue(IsButtonMouseOverProperty, value); }
}
void btn_MouseChanged(object sender, MouseEventArgs e)
{
this.IsButtonMouseOver = this.btn.IsMouseOver;
}
或者更正确的是,将 IsButtonMouseOver 设为只读依赖属性,如下所示:
private static readonly DependencyPropertyKey IsButtonMouseOverPropertyKey = DependencyProperty.RegisterReadOnly("IsButtonMouseOver",
typeof(bool), typeof(ToolbarButtonCombo), new FrameworkPropertyMetadata(false));
public static readonly DependencyProperty IsButtonMouseOverProperty = ToolbarButtonCombo.IsButtonMouseOverPropertyKey.DependencyProperty;
public bool IsButtonMouseOver {
get { return (bool)this.GetValue(IsButtonMouseOverProperty); }
private set { this.SetValue(IsButtonMouseOverPropertyKey, value); }
}
您的其他属性(ButtonStyle 和 ComboStyle)也需要正确实现,并且它们的 get/set 方法不受依赖属性支持。