Add touch/pointer event support to Blazor views and revamp sample app by Copilot · Pull Request #3528 · mono/SkiaSharp

Copilot · 2026-02-26T17:24:52Z

Description

Adds touch/pointer event support to the Blazor SKCanvasView and SKGLView components, and revamps the Blazor WebAssembly sample app into a three-page showcase of SkiaSharp capabilities.

Fixes Add wheel support to Blazor WASM views with v120 normalization #3534

Touch/pointer event system

Shared touch types

SKTouchAction, SKTouchDeviceType, SKMouseButton, and SKTouchEventArgs are moved from SkiaSharp.Views.Maui.Core to SkiaSharp.Views.Shared with #if __BLAZOR__ / #if __MAUI__ namespace switching — the same shared-file pattern used by SKPaintSurfaceEventArgs.

JS interop (`SKTouchInterop.ts`)

A class-based module (matching the SizeWatcher/DpiWatcher pattern) that:

Listens for pointer* and wheel events on the canvas element.
Maps browser events to SKTouchAction/SKMouseButton/SKTouchDeviceType enum values.
Invokes the C# callback synchronously and reads back the Handled return value.
When Handled is true: calls preventDefault() + stopPropagation() (e.g., blocks page scrolling for handled wheel events).
When Handled is false: browser default behavior is preserved.
start() adds all listeners with setPointerCapture; stop() removes them and releases capture.
Normalizes wheel delta to the v120 standard (120 = one mouse notch) across browsers and platforms.

C# interop (`SKTouchInterop.cs`)

Inherits from JSModuleInterop with #if NET7_0_OR_GREATER split:

NET7+: [JSImport] static partial methods with Func<JSObject, bool> callback. The JSObject proxy is disposed via using var _ after property extraction to prevent GC/finalizer pressure from high-frequency pointer events.
Pre-NET7: DotNetObjectReference<SKTouchCallbackHelper> with [JSInvokable] bool OnPointerEvent(...).

View changes (`SKCanvasView` & `SKGLView`)

New component parameters:

Parameter	Type	Description
`Touch`	`Action<SKTouchEventArgs>?`	Callback for pointer/touch/wheel events
`EnableTouchEvents`	`bool`	Opt-in; when `false` (default), no JS listeners are attached

The JS module is imported on first render but listeners are not attached until EnableTouchEvents is set to true. Toggling at runtime calls Start()/Stop() to fully connect/disconnect all JS event listeners.

Blazor sample app revamp

The basic Blazor WebAssembly sample is rebuilt from the ground up into three pages:

Page	What it demonstrates
Home	CPU-rendered gradient background with animated circles, text rendering with `SKFont`/`SKTextBlob`, and `SKCanvasView` basics
GPU	`SKGLView` with a real-time SkSL metaball shader, touch interaction (drag to attract blobs), and FPS overlay
Drawing	Multi-touch drawing canvas with stroke recording, color picker toolbar, wheel-to-resize brush, and undo support

Sample features exercised

SKCanvasView with OnPaintSurface (Home)
SKGLView with EnableRenderLoop and OnPaintSurface (GPU)
Touch events: Pressed, Moved, Released, WheelChanged (Drawing, GPU)
Handled feedback loop — blocks page scroll during drawing, allows scroll on Home
SKRuntimeEffect.BuildShader with SkSL (GPU)
SKPath stroke recording and replay (Drawing)
Scoped .razor.css for component-level styling (GPU, Drawing)

API Changes

Added:

enum SKTouchAction { Entered, Pressed, Moved, Released, Cancelled, Exited, WheelChanged } (shared)
enum SKTouchDeviceType { Touch, Mouse, Pen } (shared)
enum SKMouseButton { Unknown, Left, Middle, Right } (shared)
class SKTouchEventArgs : EventArgs — Id, ActionType, DeviceType, MouseButton, Location, InContact, WheelDelta, Pressure, Handled (shared)
Action<SKTouchEventArgs>? SKCanvasView.Touch
bool SKCanvasView.EnableTouchEvents
Action<SKTouchEventArgs>? SKGLView.Touch
bool SKGLView.EnableTouchEvents

Moved (no breaking change):

SKTouchEventArgs, SKTouchAction, SKTouchDeviceType, SKMouseButton moved from SkiaSharp.Views.Maui.Core/SKTouchEventArgs.cs to SkiaSharp.Views.Shared/SKTouchEventArgs.cs with conditional namespace via #if __BLAZOR__ / #if __MAUI__

Behavioral Changes

Touch events are opt-in via EnableTouchEvents="true". When false (default), no JS event listeners are attached. Existing usage is unaffected.

When touch events are enabled:

e.Handled = true → JS calls preventDefault()/stopPropagation() on the browser event
e.Handled = false (default) → browser default behavior is preserved

Usage

<SKCanvasView OnPaintSurface="OnPaintSurface"
              Touch="OnTouch" EnableTouchEvents="true" />

@code {
    void OnTouch(SKTouchEventArgs e)
    {
        var point = e.Location;    // CSS pixels
        var device = e.DeviceType; // Touch, Mouse, or Pen
        e.Handled = true;          // preventDefault + stopPropagation in browser
    }
}

PR Checklist

Has tests (no existing Blazor test project; recommend tests/SkiaSharp.Views.Blazor.Tests with bUnit)
Rebased on top of main
Changes adhere to coding standard
Updated sample app

mattleibow · 2026-02-26T22:23:15Z

@copilot we need to add this to the GL view as well.

Copilot · 2026-02-26T22:25:52Z

@copilot we need to add this to the GL view as well.

Added the same Touch EventCallback, EnableTouchEvents parameter, touch interop initialization, and IAsyncDisposable to SKGLView in commit 20724c4.

source/SkiaSharp.Views/SkiaSharp.Views.Shared/SKTouchEventArgs.cs

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.ts

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/Internal/SKTouchCallbackHelper.cs

Copilot · 2026-02-26T22:37:20Z

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Copilot · 2026-02-26T22:47:55Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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Copilot

Pull request overview

Adds opt-in pointer/touch event support to the Blazor SKCanvasView and SKGLView, aligning the event args/enums shape with MAUI for source compatibility and forwarding browser pointer/wheel events via JS interop.

Changes:

Move/share SKTouchEventArgs + related enums into SkiaSharp.Views.Shared with __MAUI__ / __BLAZOR__ namespace switching.
Add Blazor JS + C# interop (SKTouchInterop.*, SKTouchCallbackHelper) to capture pointer/wheel events and forward them to .NET.
Add Touch and EnableTouchEvents parameters to SKCanvasView/SKGLView and implement async disposal for JS cleanup.

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
source/SkiaSharp.Views/SkiaSharp.Views.Shared/SKTouchEventArgs.cs	Shared touch event args/enums with MAUI/Blazor namespace switching.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.ts	Pointer/wheel event listeners and mapping to touch args payload.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.js	Built JS asset for the touch interop module.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.js.map	Source map for the built touch interop JS.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SkiaSharp.Views.Blazor.csproj	Includes shared touch types in Blazor build.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKCanvasView.razor.cs	Adds `Touch`/`EnableTouchEvents`, creates/disposes touch interop.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKGLView.razor.cs	Adds `Touch`/`EnableTouchEvents`, creates/disposes touch interop.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/Internal/SKTouchInterop.cs	Manages JS module lifetime and listener initialization/disposal.
source/SkiaSharp.Views/SkiaSharp.Views.Blazor/Internal/SKTouchCallbackHelper.cs	Receives `[JSInvokable]` callbacks and forwards payloads to C# handlers.
source/SkiaSharp.Views.Maui/SkiaSharp.Views.Maui.Core/SkiaSharp.Views.Maui.Core.csproj	Includes shared touch types in MAUI build.
.gitignore	Ignores `.nuget/` artifacts.

Comments suppressed due to low confidence (1)

source/SkiaSharp.Views/SkiaSharp.Views.Shared/SKTouchEventArgs.cs:5

using Microsoft.Maui; is now wrapped in #if __MAUI__, but this file no longer references any Microsoft.Maui types, so the using is unused and can generate warnings in MAUI builds. Consider removing it (or adding an alias/usage if still intended).

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKCanvasView.razor.cs

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKGLView.razor.cs

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.ts

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKCanvasView.razor.cs

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKGLView.razor.cs

mattleibow

@copilot Please look at how we did interop for other features and make sure to match that.

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKCanvasView.razor.cs

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/Internal/SKTouchInterop.cs

Copilot · 2026-02-26T23:44:13Z

@copilot Please look at how we did interop for other features and make sure to match that.

Refactored all touch interop to match the existing patterns in commit d047799:

SKTouchInterop inherits from JSModuleInterop with #if NET7_0_OR_GREATER split (like SizeWatcherInterop, DpiWatcherInterop)
SKTouchCallbackHelper guarded with #if !NET7_0_OR_GREATER (like ActionHelper, FloatFloatActionHelper)
Touch parameter changed to Action<SKTouchEventArgs>? (like OnPaintSurface)
TypeScript rewritten as class-based module with invokeMethod (sync) and typeof callback === 'function' pattern (like SizeWatcher, DpiWatcher)
No more IAsyncDisposable — disposal goes through JSModuleInterop.Dispose()

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

crl.godaddy.com
- Triggering command: /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp/SkiaSharp/samples/Basic/UnoPlatform/SkiaSharpSample.sln --packages /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true /p:EnableWindowsTargeting=true SkiaSharp.Views.Blazor/wwwroot/SKTouchInterop.js.map (dns block)
- Triggering command: /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp/SkiaSharp/samples/Gallery/Uno.WinUI/SkiaSharpSample.Skia.Gtk/SkiaSharpSample.Skia.Gtk.csproj --packages /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true /p:EnableWindowsTargeting=true SkiaSharp.Views//tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/packages (dns block)
- Triggering command: /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/.dotnet/dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp/SkiaSharp/samples/Gallery/Uno/SkiaSharpSample.Wasm/SkiaSharpSample.Wasm.csproj --packages /tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-04aa162449f907a2/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true /p:EnableWindowsTargeting=true SkiaSharp.Views/SkiaSharp.Views.Blazor/SKGLView.razor.cs embly/SkiaSharpSample.sln working/.dotnet/dotnet-install.sh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

mattleibow

@copilot Please update the blazor basic sample to now use these touch events and remove the other attributes.

Also address the comments

source/SkiaSharp.Views/SkiaSharp.Views.Blazor/SKCanvasView.razor.cs

- Home: gradient background with scattered circles and feature overview - Raster: simplified to pure rendering demo (shapes, gradient, text) - GPU: polished description for animated SKGLView clock - Drawing (NEW): interactive canvas with touch drawing, mouse wheel brush size control (v120 delta), pressure sensitivity, color picker, and clear button — demonstrates touch, wheel, and Handled feedback - NavMenu: updated with all four page links Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Home: gradient + circles landing page (SKCanvasView basics) - GPU: pure SkSL lava lamp with 6 metaballs, touch interaction, SKRuntimeEffect.BuildShader() + Uniforms + Build() pattern - Drawing: touch/pointer drawing with wheel brush size control, pressure sensitivity, color picker, overlaid toolbar - Remove redundant Raster page (covered by Home + Drawing) - Full-viewport flex layout with overflow: hidden - Add detailed comments for new users learning SkiaSharp - Update NavMenu with GPU card and pencil icons Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Extract all inline CSS from GPU.razor and Drawing.razor into page-scoped stylesheets (GPU.razor.css, Drawing.razor.css). Only dynamic values (color swatch backgrounds) remain inline. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Extract GPU and Drawing code to .razor.cs partial classes - Use C# 11 raw string literal for SkSL shader source - Make DrawingStroke a record - Remove unused SKGLView ref from GPU page - Remove pen pressure logic from Drawing for simplicity - Initialize shader builder as a field instead of lazy in render Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Revert code-behind split — keep everything in single .razor files for simplicity. Use @"" verbatim string for SkSL since Razor doesn't support C# 11 raw string literals. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Move @code blocks to .razor.cs code-behind partial classes to enable C# 11 raw string literals (triple-quote) for the SkSL shader source. Razor markup stays in .razor files. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Razor compiler doesn't support C# 11 raw string literals until .NET 10. Use @"" verbatim strings for SkSL and keep everything in single .razor files for simplicity. Delete code-behind files. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Lift reusable SKPaint to readonly fields with target-typed new() - Use collection expression syntax instead of new[] - Add period-terminated comments on fields - Wrap <p> content across multiple lines - Add blank line after @code { Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

mattleibow · 2026-02-28T02:35:47Z

/azp run

azure-pipelines · 2026-02-28T02:35:54Z

No pipelines are associated with this pull request.

mattleibow · 2026-02-28T03:01:44Z

/azp run

azure-pipelines · 2026-02-28T03:01:49Z

No pipelines are associated with this pull request.

Copilot

Pull request overview

Copilot reviewed 20 out of 22 changed files in this pull request and generated 3 comments.

samples/Basic/BlazorWebAssembly/SkiaSharpSample/Pages/Home.razor

samples/Basic/BlazorWebAssembly/SkiaSharpSample/Pages/Drawing.razor

samples/Basic/BlazorWebAssembly/SkiaSharpSample/Pages/GPU.razor

The file lives in SkiaSharp.Views.Shared which is compiled by SkiaSharp.Views.csproj for native platforms (iOS, Android, etc.) via a wildcard include. Those platforms define neither __MAUI__ nor __BLAZOR__, so the namespace block was stripped and the bare braces caused CS1513/CS1022. Wrapping the entire file ensures it compiles to nothing on native platform builds. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

mattleibow · 2026-02-28T08:27:17Z

/azp run

azure-pipelines · 2026-02-28T08:27:23Z

No pipelines are associated with this pull request.

Co-authored-by: mattleibow <1096616+mattleibow@users.noreply.github.com>

mattleibow · 2026-03-02T15:52:55Z

Closing this as we do not want to be adding APIs to platforms. And there is no need to actually, the events are fine.

Copilot AI assigned Copilot and mattleibow Feb 26, 2026

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Copilot AI changed the title ~~[WIP] Add Touch event to Blazor canvas view~~ Add touch/pointer event support to Blazor SKCanvasView Feb 26, 2026

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mattleibow and others added 9 commits February 28, 2026 02:12

Move code back inline into .razor files

9bd00da

Revert code-behind split — keep everything in single .razor files for simplicity. Use @"" verbatim string for SkSL since Razor doesn't support C# 11 raw string literals. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

colors

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mattleibow changed the title ~~Add touch/pointer event support to Blazor SKCanvasView and SKGLView~~ Add touch/pointer event support to Blazor views and revamp sample app Feb 28, 2026

Delete SkiaSharpSample.sln

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This was referenced Feb 28, 2026

Add Drawing and GPU sample pages to Blazor demo mono/SkiaSharp.Extended#368

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Add revamped Blazor sample pages from PR #3528 (sample changes only) #3541

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Copilot AI added a commit that referenced this pull request Feb 28, 2026

Add new Blazor sample pages from PR #3528 (sample changes only)

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Co-authored-by: mattleibow <1096616+mattleibow@users.noreply.github.com>

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Description

Touch/pointer event system

Shared touch types

JS interop (SKTouchInterop.ts)

C# interop (SKTouchInterop.cs)

View changes (SKCanvasView & SKGLView)

Blazor sample app revamp

Sample features exercised

API Changes

Behavioral Changes

Usage

PR Checklist

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Copilot AI commented Feb 26, 2026 •

edited by mattleibow

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JS interop (`SKTouchInterop.ts`)

C# interop (`SKTouchInterop.cs`)

View changes (`SKCanvasView` & `SKGLView`)

Copilot AI commented Feb 26, 2026 •

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