将鼠标保持在 Swift 范围内

Question

我试图阻止鼠标光标离开屏幕的特定区域。我找不到执行此操作的本机方法，所以我尝试手动执行此操作。

到目前为止我有这个：

NSEvent.addGlobalMonitorForEvents(matching: [.mouseMoved, .leftMouseDragged], handler: {(event: NSEvent) in
    let x = event.locationInWindow.flipped.x;
    let y = event.locationInWindow.flipped.y;
        
    if (x <= 100) {
        CGWarpMouseCursorPosition(CGPoint(x: 100, y: y))
    }
})

// elsewhere to flip y coordinates
extension NSPoint {
    var flipped: NSPoint {
        let screenFrame = (NSScreen.main?.frame)!
        let screenY = screenFrame.size.height - self.y
        return NSPoint(x: self.x, y: screenY)
    }
}

这会阻止光标离开 X 轴。伟大的。但是它也会阻止光标在 X=100 处沿 y 轴滑动。

所以我尝试添加增量：

NSEvent.addGlobalMonitorForEvents(matching: [.mouseMoved, .leftMouseDragged], handler: {(event: NSEvent) in
    let x = event.locationInWindow.flipped.x;
    let y = event.locationInWindow.flipped.y;
    let deltaY = event.deltaY;
        
    if (x <= 100) {
        CGWarpMouseCursorPosition(CGPoint(x: 100, y: y + deltaY))
    }
})

现在它确实沿 Y 轴滑动。但是加速还差得远，太快了。我没有得到的是，如果我尝试做 y - deltaY 它会像我预期的那样滑动，但是 reversed:

NSEvent.addGlobalMonitorForEvents(matching: [.mouseMoved, .leftMouseDragged], handler: {(event: NSEvent) in
    let x = event.locationInWindow.flipped.x;
    let y = event.locationInWindow.flipped.y;
    let deltaY = event.deltaY;
        
    if (x <= 100) {
        CGWarpMouseCursorPosition(CGPoint(x: 100, y: y - deltaY))
    }
})

现在光标以适当的加速度沿 X=100 处的 Y 轴滑动（就像在屏幕边缘滑动光标），但它是相反的。向上移动鼠标，向下移动光标。

如何在我的自定义区域的边缘以正确的方向正确平滑地滑动光标？

或者是否有更好的方法来实现我想要做的事情？

Answer 1

我明白了。我需要减去之前的增量。

所以现在我有了这个：

var oldDeltaX: CGFloat = 0;
var oldDeltaY: CGFloat = 0;

NSEvent.addGlobalMonitorForEvents(matching: [.mouseMoved, .leftMouseDragged, .rightMouseDragged], handler: {(event: NSEvent) in
  let deltaX = event.deltaX - oldDeltaX;
  let deltaY = event.deltaY - oldDeltaY;
  let x = event.locationInWindow.flipped.x;
  let y = event.locationInWindow.flipped.y;

  let window = (NSScreen.main?.frame.size)!;
  let width = CGFloat(1920);
  let height = CGFloat(1080);

  let widthCut = (window.width - width) / 2;
  let heightCut = (window.height - height) / 2;

  let xPoint = clamp(x + deltaX, minValue: widthCut, maxValue: window.width - widthCut);
  let yPoint = clamp(y + deltaY, minValue: heightCut, maxValue: window.height - heightCut);
 
  oldDeltaX = xPoint - x;
  oldDeltaY = yPoint - y;
            
  CGWarpMouseCursorPosition(CGPoint(x: xPoint, y: yPoint));
});

public func clamp<T>(_ value: T, minValue: T, maxValue: T) -> T where T : Comparable {
  return min(max(value, minValue), maxValue)
}

extension NSPoint {
  var flipped: NSPoint {
    let screenFrame = (NSScreen.main?.frame)!
    let screenY = screenFrame.size.height - self.y
    return NSPoint(x: self.x, y: screenY)
  }
}

这会将鼠标限制在 1920x1080 的显示区域中。

我发现 Godot 的源代码是很好的资源：https://github.com/godotengine/godot/blob/51a00c2855009ce4cd6475c09209ebd22641f448/platform/osx/display_server_osx.mm#L1087

这是最好的或最有效的方法吗？我不知道，但它有效。

将鼠标保持在 Swift 范围内

Keep mouse within area in Swift

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