Description

The Blender and SDL teams found a way to get warping the mouse cursor to work under XWayland. This is my attempt at implementing their technique in SFML.

The cursor can be warped under XWayland if it is hidden first. This change detects if the cursor is visible, and if it is, hides it, restoring it after the warp.

The relativeTo reference to the WindowBase is const when it's passed in to sf::Mouse::setPosition(), so I'm using const_cast here to get it working. I know this isn't ideal. I'm sure there's a better way, but I wanted to get the ball rolling on this.

This PR is related to the issue #2750

Tasks

• Tested on Linux
• Tested on Windows
• Tested on macOS
• Tested on iOS
• Tested on Android

How to test this PR?

#include <SFML/Graphics.hpp>
#include <iostream>

int main()
{
	sf::RenderWindow window(sf::VideoMode({640,480}),"Warp");

	while (window.isOpen())
	{
		while (const std::optional event = window.pollEvent())
		{
			if (event->is<sf::Event::Closed>())
				window.close();
		}

		window.clear();
		window.display();
		auto position=sf::Mouse::getPosition(window);
		std::cout << "X: " << position.x << ", Y: " << position.y << "\n";
		sf::Mouse::setPosition({320,240},window);
	}

	return 0;
}