Description

On Mac Catalyst, SKCanvasView with EnableTouchEvents = true does not deliver mouse hover events (mouse move without any button pressed). The Touch event only fires for Pressed, Moved (with contact), and Released — never for non-contact Moved, Entered, or Exited actions.

Expected Behavior

When the mouse cursor moves over the SKCanvasView without any button pressed, the Touch event should fire with:

• ActionType = SKTouchAction.Moved and InContact = false, OR
• ActionType = SKTouchAction.Entered / SKTouchAction.Exited when the cursor enters/leaves the view

This works correctly on other platforms (e.g., WPF, WinUI).

Actual Behavior

No touch events are delivered at all when the mouse hovers over the canvas without pressing a button. Only mouse clicks (Pressed/Released) and dragging (Moved with InContact=true) generate events.

Root Cause Analysis

On Mac Catalyst (UIKit), mouse hover requires a UIHoverGestureRecognizer to be added to the view. Standard UIGestureRecognizer and touch handling (touchesBegan/touchesMoved/touchesEnded) only track contacts (finger or mouse button pressed), not passive pointer movement.

Suggested Fix

In the Mac Catalyst platform handler for SKCanvasView, add a UIHoverGestureRecognizer:

// In the Mac Catalyst SKCanvasView handler (e.g., SKCanvasViewHandler or the native view)
var hoverRecognizer = new UIHoverGestureRecognizer((recognizer) =>
{
    var location = recognizer.LocationInView(this);
    var skPoint = new SKPoint((float)location.X, (float)location.Y);
    
    SKTouchAction action = recognizer.State switch
    {
        UIGestureRecognizerState.Began => SKTouchAction.Entered,
        UIGestureRecognizerState.Changed => SKTouchAction.Moved,
        UIGestureRecognizerState.Ended or 
        UIGestureRecognizerState.Cancelled => SKTouchAction.Exited,
        _ => SKTouchAction.Moved
    };
    
    var args = new SKTouchEventArgs(/* id */ -1, action, SKMouseButton.Unknown, SKTouchDeviceType.Mouse, 
        skPoint, inContact: false, wheelDelta: 0, pressure: 0);
    OnTouch(args);
});
AddGestureRecognizer(hoverRecognizer);

UIHoverGestureRecognizer is available since iOS 13.0 / Mac Catalyst 13.0.

Reproduction Steps

1. Create a MAUI app targeting net9.0-maccatalyst
2. Add an SKCanvasView with EnableTouchEvents="True"
3. Subscribe to the Touch event and log all events
4. Run on macOS
5. Move the mouse cursor over the canvas without clicking
6. Observe: no events are logged

Environment

• SkiaSharp: 3.119.1
• SkiaSharp.Views.Maui.Controls: 3.119.1
• .NET: 9.0
• macOS (Mac Catalyst)
• Also affects iPadOS with trackpad/mouse support