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feat: add new class inheritance mechanism.

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This commit is contained in:
rabbitism
2024-08-12 13:33:27 +08:00
parent b58c8f071e
commit 74ad61515f
5 changed files with 124 additions and 16 deletions
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66
src/Ursa.Themes.Semi/Behaviors/ClassHelper.cs
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@@ -1,25 +1,69 @@
using Avalonia;
using System.Collections.Specialized;
using Avalonia;
using Avalonia.Collections;
namespace Ursa.Themes.Semi;
internal class ClassHelper: AvaloniaObject
internal class ClassHelper : AvaloniaObject
{
static ClassHelper()
{
ClassesProperty.Changed.AddClassHandler<StyledElement>(OnClassesChanged);
}
public static readonly AttachedProperty<string> ClassesProperty =
AvaloniaProperty.RegisterAttached<ClassHelper, StyledElement, string>("Classes");
public static void SetClasses(AvaloniaObject obj, string value) => obj.SetValue(ClassesProperty, value);
public static string GetClasses(AvaloniaObject obj) => obj.GetValue(ClassesProperty);
public static readonly AttachedProperty<StyledElement> ClassSourceProperty =
AvaloniaProperty.RegisterAttached<ClassHelper, StyledElement, StyledElement>("ClassSource");
static ClassHelper()
{
ClassesProperty.Changed.AddClassHandler<StyledElement>(OnClassesChanged);
ClassSourceProperty.Changed.AddClassHandler<StyledElement>(OnClassSourceChanged);
}
private static void OnClassSourceChanged(StyledElement arg1, AvaloniaPropertyChangedEventArgs arg2)
{
if (arg2.NewValue is StyledElement styledElement)
{
arg1.Classes.Clear();
var nonPseudoClasses = styledElement.Classes.Where(c => !c.StartsWith(":"));
arg1.Classes.AddRange(nonPseudoClasses);
styledElement.Classes.WeakSubscribe((o, e) => OnSourceClassesChanged(o, e, arg1));
}
}
private static void OnSourceClassesChanged(object sender, NotifyCollectionChangedEventArgs e, StyledElement target)
{
if (sender is AvaloniaList<string> classes)
{
target.Classes.Clear();
var nonPseudoClasses = classes.Where(c => !c.StartsWith(":"));
target.Classes.AddRange(nonPseudoClasses);
}
}
public static void SetClasses(AvaloniaObject obj, string value)
{
obj.SetValue(ClassesProperty, value);
}
public static string GetClasses(AvaloniaObject obj)
{
return obj.GetValue(ClassesProperty);
}
private static void OnClassesChanged(StyledElement sender, AvaloniaPropertyChangedEventArgs value)
{
string? classes = value.GetNewValue<string?>();
var classes = value.GetNewValue<string?>();
if (classes is null) return;
sender.Classes.Clear();
sender.Classes.Add(classes);
}
public static void SetClassSource(StyledElement obj, StyledElement value)
{
obj.SetValue(ClassSourceProperty, value);
}
public static StyledElement GetClassSource(StyledElement obj)
{
return obj.GetValue(ClassSourceProperty);
}
}