public static IObservable <object?> GetResourceObservable(
this IResourceHost control,
object key,
Func <object?, object?>?converter = null)
{
control = control ?? throw new ArgumentNullException(nameof(control));
key = key ?? throw new ArgumentNullException(nameof(key));
return(new ResourceObservable(control, key, converter));
}
public static object?FindResource(this IResourceHost control, object key)
{
control = control ?? throw new ArgumentNullException(nameof(control));
key = key ?? throw new ArgumentNullException(nameof(key));
if (control.TryFindResource(key, out var value))
{
return(value);
}
return(AvaloniaProperty.UnsetValue);
}
public static bool TryFindResource(this IResourceHost control, object key, out object?value)
{
control = control ?? throw new ArgumentNullException(nameof(control));
key = key ?? throw new ArgumentNullException(nameof(key));
IResourceNode?current = control;
while (current != null)
{
if (current.TryGetResource(key, out value))
{
return(true);
}
current = (current as IStyledElement)?.StylingParent as IResourceNode;
}
value = null;
return(false);
}
/// <summary>
/// Looks for a suitable resource in the program.
/// </summary>
/// <param name="key">Resource name</param>
/// <typeparam name="T">Resource type</typeparam>
/// <returns>Resource found, otherwise null</returns>
public static T GetResource <T>(object key)
{
object value = null;
IResourceHost current = Current;
while (current != null)
{
if (current is IResourceHost host)
{
if (host.TryGetResource(key, out value))
{
return((T)value);
}
}
current = ((IStyledElement)current).StylingParent as IResourceHost;
}
return((T)value);
}
/// <summary> /// Initializes a new instance of the <see cref="ResourceDictionary"/> class. /// </summary> public ResourceDictionary(IResourceHost owner) => Owner = owner;
public void RemoveOwner(IResourceHost owner) => Owner = null;
public void AddOwner(IResourceHost owner) => Owner = owner;
public ResourceDictionary(IResourceHost owner)
: this()
{
Owner = owner;
}
void IResourceProvider.RemoveOwner(IResourceHost owner) => (Loaded as IResourceProvider)?.RemoveOwner(owner);
void IResourceProvider.AddOwner(IResourceHost owner) => (Loaded as IResourceProvider)?.AddOwner(owner);
public ThemeStyles(IResourceHost owner)
: this()
{
Owner = owner;
}
public ResourceObservable(IResourceHost target, object key, Func <object?, object?>?converter)
{
_target = target;
_key = key;
_converter = converter;
}