How to close GLFW window when we close QT application - qt

Question

When i close the QT GUI i want the GLFW window to be closed accordingly.
For glfw we can query if window is closed or not by glfwWindowShouldClose function.
Do we have anything like that in QT where we can keep Querying if the application GUI is closed.
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TreeModel model;
QTApplication w(model);
int return_code = 0;
QTApplication.show();
glfwInit();
glfwWindowHint(GLFW_RESIZABLE, GL_TRUE);
glfwWindowHint(GLFW_SAMPLES, 4);
window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "Renderer", nullptr, nullptr); // Create the render window
if (window == NULL)
{
QMessageBox msgBox;
msgBox.setText("Not able to create GL Window");
msgBox.exec();
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
GLenum GlewInitResult;
glewExperimental = GL_TRUE;
GlewInitResult = glewInit();
if (GLEW_OK != GlewInitResult) // Check if glew is initialized properly
{
glfwTerminate();
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
while (!glfwWindowShouldClose(window))
{
// Do Rendering here
}
return_code = a.exec();
glfwTerminate();
return return_code;
}
}

Answer 1

There is a signal for that, emitted by the application:
QGuiApplication::lastWindowClosed()
It looks like what you want to do is intermangle the Qt event loop with your own loop. Here is a hint about how to do that from the Qt docs:
To make your application perform idle processing (i.e. executing a special function whenever there are no pending events), use a QTimer with 0 timeout. More sophisticated idle processing schemes can be achieved using processEvents().
So this is how I would approach this:
Setup a QTimer that connects to a method that does rendering (if window should not close) and restarts the timer
Call a.exec()
In the method called by the timer, if window should close, call a.quit()