Align skia plugin API with normal plugin API

src/DesktopMagic/BuiltInPlugins/SkiaBenchmarkPlugin.cs

@@ -39,7 +39,7 @@ internal class SkiaBenchmarkPlugin : SkiaPlugin
         surface = SKSurface.Create(new SKImageInfo(w, h, SKColorType.Bgra8888, SKAlphaType.Premul));
     }
 
-    public override SKImage? Render()
+    public override SKImage? Main()
     {
         long now = frameTimer.ElapsedMilliseconds;
         if (lastFrameMs > 0)

src/DesktopMagic/BuiltInPlugins/TimePlugin.cs

@@ -17,7 +17,7 @@ internal class TimePlugin : SkiaPlugin
 
     public override int UpdateInterval => 1000;
 
-    public override SKImage? Render()
+    public override SKImage? Main()
     {
         string time = GetTime();
 

src/DesktopMagic/Plugins/PluginWindow.xaml.cs

@@ -1136,11 +1136,11 @@ public partial class PluginWindow : Window, IPluginWindow
         if (plugin is SkiaAsyncPlugin skiaAsyncPlugin)
         {
             CancellationToken token = pluginCancellationTokenSource?.Token ?? CancellationToken.None;
-            skImage = await skiaAsyncPlugin.RenderAsync(token);
+            skImage = await skiaAsyncPlugin.MainAsync(token);
         }
         else if (plugin is SkiaPlugin skiaPlugin)
         {
-            skImage = skiaPlugin.Render();
+            skImage = skiaPlugin.Main();
         }
         else
         {

src/DesktopMagicPluginAPI/SkiaAsyncPlugin.cs

@@ -1,5 +1,6 @@
 using SkiaSharp;
 
+using System.ComponentModel;
 using System.Drawing;
 using System.Threading;
 using System.Threading.Tasks;
@@ -7,29 +8,41 @@ using System.Threading.Tasks;
 namespace DesktopMagic.Api;
 
 /// <summary>
-/// Provides an abstract base class for creating asynchronous plugins using SkiaSharp rendering.
-/// Plugins override <see cref="RenderAsync(CancellationToken)"/> and return an <see cref="SKImage"/>
-/// of their own size, just like <see cref="AsyncPlugin.MainAsync(CancellationToken)"/> returns a
-/// <see cref="Bitmap"/>. The returned image is scaled to fit the plugin window while preserving
-/// its aspect ratio.
-/// All existing <see cref="Plugin"/>, <see cref="AsyncPlugin"/>, and <see cref="SkiaPlugin"/> code is unaffected.
+/// Infrastructure base class of <see cref="SkiaAsyncPlugin"/>. Derive from <see cref="SkiaAsyncPlugin"/> instead.
 /// </summary>
-public abstract class SkiaAsyncPlugin : AsyncPlugin
+/// <remarks>This class only exists to seal the <see cref="Bitmap"/> based <see cref="AsyncPlugin.MainAsync"/> method,
+/// so that <see cref="SkiaAsyncPlugin"/> can declare its own <see cref="SkiaAsyncPlugin.MainAsync"/> method returning an <see cref="SKImage"/>.</remarks>
+[EditorBrowsable(EditorBrowsableState.Never)]
+public abstract class SkiaAsyncPluginBase : AsyncPlugin
 {
     /// <summary>
-    /// This method is sealed and returns null for async Skia plugins.
-    /// Override <see cref="RenderAsync(CancellationToken)"/> instead.
+    /// This method should not be called directly! Override and use <see cref="SkiaAsyncPlugin.MainAsync"/> for asynchronous Skia plugin rendering.
     /// </summary>
+    /// <remarks>This method only exists to fulfill base class requirements.</remarks>
+    /// <param name="cancellationToken">Token signaled when the host requests cancellation.</param>
+    /// <returns>A task that always resolves to <see langword="null"/>.</returns>
     public sealed override Task<Bitmap?> MainAsync(CancellationToken cancellationToken)
     {
         return Task.FromResult<Bitmap?>(null);
     }
+}
 
 /// <summary>
-    /// Called every <see cref="Plugin.UpdateInterval"/> milliseconds to render the plugin asynchronously.
-    /// Return <see langword="null"/> to keep the previously rendered image.
+/// Provides an abstract base class for creating asynchronous plugins that render with SkiaSharp and can be integrated into the application,
+/// supporting periodic updates, rendering, and user interaction.
+/// </summary>
+/// <remarks>Derive from this class to implement custom plugin functionality. The class defines lifecycle methods
+/// such as <see cref="AsyncPlugin.StartAsync"/>, <see cref="AsyncPlugin.StopAsync"/>, and <see cref="MainAsync"/> for activation, deactivation, and periodic
+/// execution. It also provides event handlers for mouse and theme interactions, as well as access to application data
+/// and rendering configuration. Implementations should override relevant methods to respond to user input, update
+/// intervals, and configuration changes as needed. The image returned by <see cref="MainAsync"/> is scaled to fit the
+/// plugin window while preserving its aspect ratio.</remarks>
+public abstract class SkiaAsyncPlugin : SkiaAsyncPluginBase
+{
+    /// <summary>
+    /// Occurs when the <see cref="Plugin.UpdateInterval"/> elapses.
     /// </summary>
     /// <param name="cancellationToken">Token signaled when the host requests cancellation.</param>
     /// <returns>The rendered image, or <see langword="null"/> to keep the previous frame.</returns>
-    public abstract Task<SKImage?> RenderAsync(CancellationToken cancellationToken);
+    public new abstract Task<SKImage?> MainAsync(CancellationToken cancellationToken);
 }

src/DesktopMagicPluginAPI/SkiaPlugin.cs

@@ -1,32 +1,44 @@
 using SkiaSharp;
 
+using System.ComponentModel;
 using System.Drawing;
 
 namespace DesktopMagic.Api;
 
 /// <summary>
-/// Provides an abstract base class for creating plugins using SkiaSharp rendering.
-/// Plugins override <see cref="Render()"/> and return an <see cref="SKImage"/> of their own size,
-/// just like <see cref="Plugin.Main()"/> returns a <see cref="Bitmap"/>. The returned image is
-/// scaled to fit the plugin window while preserving its aspect ratio.
-/// All existing <see cref="Plugin"/> and <see cref="AsyncPlugin"/> code is unaffected.
+/// Infrastructure base class of <see cref="SkiaPlugin"/>. Derive from <see cref="SkiaPlugin"/> instead.
 /// </summary>
-public abstract class SkiaPlugin : Plugin
+/// <remarks>This class only exists to seal the <see cref="Bitmap"/> based <see cref="Plugin.Main"/> method,
+/// so that <see cref="SkiaPlugin"/> can declare its own <see cref="SkiaPlugin.Main"/> method returning an <see cref="SKImage"/>.</remarks>
+[EditorBrowsable(EditorBrowsableState.Never)]
+public abstract class SkiaPluginBase : Plugin
 {
     /// <summary>
-    /// This method is sealed and returns null for Skia plugins.
-    /// Override <see cref="Render()"/> instead.
+    /// This method should not be called directly! Override and use <see cref="SkiaPlugin.Main"/> for Skia plugin rendering.
     /// </summary>
-    /// <returns>Always null.</returns>
+    /// <remarks>This method only exists to fulfill base class requirements.</remarks>
+    /// <returns>Always <see langword="null"/>.</returns>
     public sealed override Bitmap? Main()
     {
         return null;
     }
+}
 
 /// <summary>
-    /// Called every <see cref="Plugin.UpdateInterval"/> milliseconds to render the plugin.
-    /// Return <see langword="null"/> to keep the previously rendered image.
+/// Provides an abstract base class for creating plugins that render with SkiaSharp and can be integrated into the application,
+/// supporting periodic updates, rendering, and user interaction.
+/// </summary>
+/// <remarks>Derive from this class to implement custom plugin functionality. The class defines lifecycle methods
+/// such as <see cref="Plugin.Start"/>, <see cref="Plugin.Stop"/>, and <see cref="Main"/> for activation, deactivation, and periodic
+/// execution. It also provides event handlers for mouse and theme interactions, as well as access to application data
+/// and rendering configuration. Implementations should override relevant methods to respond to user input, update
+/// intervals, and configuration changes as needed. The image returned by <see cref="Main"/> is scaled to fit the
+/// plugin window while preserving its aspect ratio.</remarks>
+public abstract class SkiaPlugin : SkiaPluginBase
+{
+    /// <summary>
+    /// Occurs when the <see cref="Plugin.UpdateInterval"/> elapses.
     /// </summary>
     /// <returns>The rendered image, or <see langword="null"/> to keep the previous frame.</returns>
-    public abstract SKImage? Render();
+    public new abstract SKImage? Main();
 }