60 lines
2.4 KiB
C#
60 lines
2.4 KiB
C#
using Avalonia;
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using Avalonia.Controls;
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using Avalonia.Controls.Primitives;
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using Avalonia.Styling;
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using Ursa.Common;
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namespace Ursa.Controls;
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public class ScrollTo
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{
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public static readonly AttachedProperty<Position?> DirectionProperty =
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AvaloniaProperty.RegisterAttached<ScrollTo, Control, Position?>("Direction");
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public static void SetDirection(Control obj, Position value) => obj.SetValue(DirectionProperty, value);
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public static Position? GetDirection(Control obj) => obj.GetValue(DirectionProperty);
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public static readonly AttachedProperty<ControlTheme?> ButtonThemeProperty =
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AvaloniaProperty.RegisterAttached<ScrollTo, Control, ControlTheme?>("ButtonTheme");
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public static void SetButtonTheme(Control obj, ControlTheme? value) => obj.SetValue(ButtonThemeProperty, value);
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public static ControlTheme? GetButtonTheme(Control obj) => obj.GetValue(ButtonThemeProperty);
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static ScrollTo()
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{
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DirectionProperty.Changed.AddClassHandler<Control, Position?>(OnDirectionChanged);
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ButtonThemeProperty.Changed.AddClassHandler<Control, ControlTheme?>(OnButtonThemeChanged);
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}
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private static void OnButtonThemeChanged(Control arg1, AvaloniaPropertyChangedEventArgs<ControlTheme?> arg2)
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{
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var button = EnsureButtonInAdorner(arg1);
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if (button is null) return;
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button.SetCurrentValue(StyledElement.ThemeProperty, arg2.NewValue.Value);
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}
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private static void OnDirectionChanged(Control control, AvaloniaPropertyChangedEventArgs<Position?> args)
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{
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if (args.NewValue.Value is null) return;
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var button = EnsureButtonInAdorner(control);
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if (button is null) return;
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button.SetCurrentValue(ScrollToButton.DirectionProperty, args.NewValue.Value);
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}
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private static ScrollToButton? EnsureButtonInAdorner(Control control)
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{
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var adorner = AdornerLayer.GetAdorner(control);
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if (adorner is not ScrollToButton button)
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{
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button = new ScrollToButton();
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AdornerLayer.SetAdorner(control, button);
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}
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button.SetCurrentValue(ScrollToButton.TargetProperty, control);
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button.SetCurrentValue(ScrollToButton.DirectionProperty, GetDirection(control));
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if ( GetButtonTheme(control) is { } theme)
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{
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button.SetCurrentValue(StyledElement.ThemeProperty, theme);
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}
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return button;
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}
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} |