WPF add custom attribute for control style in ResourceDictionary - wpf

Question

I am making a skin for WPF and store all the styles in ResourceDictionary. I wrote a button template which has many various colors, eg: PrimaryHover, PrimaryActive etc. If I want to add a new style with other colors, I'll need to copy and paste this code and replace colors in whole code. So as not to do this, I want to create custom properties which will contain colors and point them in the triggers. I created a class with properties but it's invisible inside the ResourceDictionary. How to do that?
<Style TargetType="{x:Type Button}" BasedOn="{StaticResource {x:Type Button}}">
<Setter Property="Background" Value="{StaticResource Primary}" />
<Setter Property="Foreground" Value="{StaticResource White}" />
<Setter Property="BorderBrush" Value="{StaticResource PrimaryBorder}"/>
<Setter Property="BorderThickness" Value="0,1,0,0"/>
<Setter Property="Padding" Value="5,0,5,0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid SnapsToDevicePixels="True">
<Border x:Name="BkgBorder" CornerRadius="3" BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" Opacity="1">
</Border>
<ContentPresenter Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="True">
<Setter Property="Background" Value="{StaticResource PrimaryFocused}" TargetName="BkgBorder"/>
<Setter Property="BorderBrush" Value="{StaticResource PrimaryBorderFocused}" TargetName="BkgBorder"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True"/>
<Condition Property="IsEnabled" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="Background" Value="{StaticResource PrimaryHover}" TargetName="BkgBorder"/>
<Setter Property="BorderBrush" Value="{StaticResource PrimaryBorderHover}" TargetName="BkgBorder"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsPressed" Value="True"/>
<Condition Property="IsEnabled" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="Background" Value="{StaticResource PrimaryActive}" TargetName="BkgBorder"/>
<Setter Property="BorderBrush" Value="{StaticResource PrimaryBorderActive}" TargetName="BkgBorder"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{StaticResource White}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
and class
class Buttons
{
public static SolidColorBrush GetHoverColor(DependencyObject obj)
{
return (SolidColorBrush)obj.GetValue(HoverColorProperty);
}
public static void SetHoverColor(DependencyObject obj, SolidColorBrush value)
{
obj.SetValue(HoverColorProperty, value);
}
public static readonly DependencyProperty HoverColorProperty =
DependencyProperty.RegisterAttached("HoverColor", typeof(SolidColorBrush), typeof(MainWindow), new PropertyMetadata(new SolidColorBrush(Colors.Green)));
}

Answer 1

I was able to copy your class into a test project exactly as it is and use it just fine.
Are you maybe neglecting to set up the XAML Namespace? My working example looks like this:
<Window x:Class="CSharpTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:CSharpTest">
<Button local:Buttons.HoverColor="Yellow"/>
</Window>
As a seperate note, keep in mind that with the way your proeprty is currently declared, it can be applied to any kind of DependencyObject. If you want to limit so it is only valid on Buttons, then you should do this instead:
public static SolidColorBrush GetHoverColor(Button obj)
{
return (SolidColorBrush)obj.GetValue(HoverColorProperty);
}
public static void SetHoverColor(Button obj, SolidColorBrush value)
{
obj.SetValue(HoverColorProperty, value);
}