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feat: implement singleton pattern for PaletteDemoViewModel and add initialization check

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This commit is contained in:
Dong Bin
2026-04-24 18:17:40 +08:00
parent 496aef2126
commit 897a71aa13
2 changed files with 10 additions and 5 deletions
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10
demo/Semi.Avalonia.Demo/Pages/PaletteDemo.axaml.cs
View File

@@ -12,14 +12,16 @@ public partial class PaletteDemo : UserControl
public PaletteDemo()
{
InitializeComponent();
this.DataContext = new PaletteDemoViewModel();
this.DataContext = PaletteDemoViewModel.Instance.Value;
}
protected override async void OnApplyTemplate(TemplateAppliedEventArgs e)
{
base.OnApplyTemplate(e);
PaletteDemoViewModel? vm = this.DataContext as PaletteDemoViewModel;
await Dispatcher.UIThread.InvokeAsync(() => { vm?.InitializeResources(); });
if (this.DataContext is PaletteDemoViewModel vm && !vm.IsInitialized)
{
await Dispatcher.UIThread.InvokeAsync(() => { vm?.InitializeResources(); });
}
}
public async Task Copy(object? o)
@@ -31,4 +33,4 @@ public partial class PaletteDemo : UserControl
await c.SetTextAsync(o.ToString());
}
}
}
}

5
demo/Semi.Avalonia.Demo/ViewModels/PaletteDemoViewModel.cs
View File

@@ -14,6 +14,8 @@ namespace Semi.Avalonia.Demo.ViewModels;
public partial class PaletteDemoViewModel : ObservableObject
{
public static Lazy<PaletteDemoViewModel> Instance { get; } = new(() => new PaletteDemoViewModel());
public bool IsInitialized { get; private set; }
private readonly string[] _predefinedColorNames =
[
"Red", "Pink", "Purple", "Violet", "Indigo",
@@ -44,6 +46,7 @@ public partial class PaletteDemoViewModel : ObservableObject
InitializePalette();
InitializeFunctionalColors();
InitializeShadows();
IsInitialized = true;
}
private void InitializePalette()
@@ -289,4 +292,4 @@ public partial class ShadowGroupViewModel : ObservableObject
}
}
}
}
}