将鼠标放在Swift中的区域内

Question

我试图防止鼠标光标离开屏幕的特定区域。我找不到一个本地方法来完成这项工作，所以我尝试手动完成。

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)
}
}

这将阻止光标偏离X轴。太好了但它也会阻止光标在X=100时沿y轴滑动。

所以我尝试添加delta:

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))
}
})

现在它确实沿着Y轴滑动。但是加速度太慢了，太快了。我没有得到的是，如果我尝试执行y - deltaY，它会像我预期的那样滑动，但反转：

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着X=100的Y轴滑动(就像在屏幕边缘滑动光标一样(，但它是相反的。向上移动鼠标，向下移动光标。

如何在自定义区域的边缘，在正确的方向上正确平滑地滑动光标？

或者有更好的方法来实现我想要做的事情吗？

Answer 1

我想明白了。我需要减去前面的delta。

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)
}
}

这会将鼠标限制在显示器的1920x1080正方形中。

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

这是最好还是最有表现的方式？我不知道，但它有效。