Transparent SFML Window

transparent_sfml.cpp

#include <SFML/Graphics.hpp>
#include <Windows.h>
#include <Dwmapi.h>

#pragma comment (lib, "Dwmapi.lib")


int main()
{
	sf::RenderWindow window(sf::VideoMode(1280, 720), "Transparent Window");
        window.setFramerateLimit(60);
        
        MARGINS margins;
	margins.cxLeftWidth = -1;
        
        SetWindowLong(window.getSystemHandle(), GWL_STYLE, WS_POPUP | WS_VISIBLE);
        DwmExtendFrameIntoClientArea(window.getSystemHandle(), &margins);
        
        
        //CircleShape for DemoContent
        sf::CircleShape shape(360.f);
	shape.setFillColor(sf::Color::Green);
        //\
        
     sf::Vector2i grabbedOffset;
	bool grabbedWindow = false;
	while (window.isOpen())
	{
		sf::Event event;
		while (window.pollEvent(event))
		{
			if (event.type == sf::Event::Closed || event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape)
				window.close();
			else if (event.type == sf::Event::MouseButtonPressed)
			{
				if (event.mouseButton.button == sf::Mouse::Left)
				{
					grabbedOffset = window.getPosition() - sf::Mouse::getPosition();
					grabbedWindow = true;
				}
			}
			else if (event.type == sf::Event::MouseButtonReleased)
			{
				if (event.mouseButton.button == sf::Mouse::Left)
					grabbedWindow = false;
			}
			else if (event.type == sf::Event::MouseMoved)
			{
				if (grabbedWindow)
					window.setPosition(sf::Mouse::getPosition() + grabbedOffset);
			}
		}

		window.clear(sf::Color::Transparent); //F*ck yeah it works as you would expect from the wording ;P
		window.draw(shape);
                window.display();
        }
        return 0;
        
}

Awesome! Thanks :3

you need to put the window style "None" in sfml window creating line for correct window scale like that sf::RenderWindow window(sf::VideoMode(1280, 720), "Transparent Window", sf::Style::None);
otherwise the system mouse will show incorrect window mouse position

Hello m1rz0, I tryed out the code. At first i don't get any errors. but then when i tryed to compile it i get this: "undefined reference to `DwmExtendFrameIntoClientArea' collect2.exe: error: ld returned 1 exit status".
Can you or someone help.
thanks!
Rmi333

Hello m1rz0, I tryed out the code. At first i don't get any errors. but then when i tryed to compile it i get this: "undefined reference to `DwmExtendFrameIntoClientArea' collect2.exe: error: ld returned 1 exit status". Can you or someone help. thanks! Rmi333

You need to link against Dwmapi.lib

link against? You mean i have to link dwmapi.dll in the def file? Also i am using Visual Studio Code. So i have to add the dll? where do i finde it?

Ah thanks i think i figured out what you ment. I added -ldwmapi to the command to compile and it worked. Thank you all! and for the Code.