Cursor is caught in unfocused window #2757
Description
This issue is probably related to my previous one: #2756
When I create a GLFW window with GLFW_CURSOR set to GLFW_CURSOR_DISABLED, and focus another window, before the GLFW window is created, it locks the cursor in the position of the window, even though it's not at the top.
Here you can see me start the program 2 times:
The first time, I just run it, it creates a window and captures the cursor as expected.
The second time, I move the eclipse window before the GLFW window appears, and the cursor is captured. In this case I'm able to unlock the cursor by opening the start menu...
2025-08-12.02-13-38.mp4
...however in another project of mine I got an even worse version of this issue, where opening the start menu does not fix it. I wasn't able to recreate the issue in a smaller program though. If code to reproduce this is needed, let me know and I'll try it again.
2025-08-12.02-24-19.mp4
Code:
import static org.lwjgl.glfw.GLFW.*;
import org.lwjgl.glfw.GLFWVidMode;
public class Test {
public static long handle;
public static void main(String[] args) {
try {
Thread.sleep(500);
}catch (Exception e) {}
glfwInit();
glfwDefaultWindowHints();
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
handle = glfwCreateWindow(640, 480, "Test", 0, 0);
centerWindow();
glfwShowWindow(handle);
boolean grabbed = false;
long start = System.currentTimeMillis();
while(true) {
glfwPollEvents();
if(glfwWindowShouldClose(handle)) {
break;
}
// Grab the cursor one second after the window is created
long now = System.currentTimeMillis();
if(now - start > 1000 && !grabbed) {
System.out.println("Grab mouse");
grabMouse();
grabbed = true;
}
}
}
public static void grabMouse() {
glfwSetInputMode(handle, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
centerCursor();
}
public static void centerCursor() {
int[] w = new int[1];
int[] h = new int[1];
glfwGetWindowSize(handle, w, h);
int x = w[0] / 2;
int y = h[0] / 2;
glfwSetCursorPos(handle, x, y);
}
public static void centerWindow() {
long primaryMonitor = glfwGetPrimaryMonitor();
GLFWVidMode vidMode = glfwGetVideoMode(primaryMonitor);
int[] w = new int[1];
int[] h = new int[1];
glfwGetWindowSize(handle, w, h);
int x = (vidMode.width() - w[0]) / 2;
int y = (vidMode.height() - h[0]) / 2;
glfwSetWindowPos(handle, x, y);
}
}