Check if GTK window has keyboard and mouse focus window C++ - c++

Question

Is there a GTK3 function that detects if a window has focus? I am currently using the following code:
#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
GtkWidget *LinuxWindow;
static void buttonMessage(GtkWidget *widget, gpointer data)
{
g_print("Yay, you clicked me!\n");
}
int main() {
GtkWidget *Box, *Button;
int argC = 0;
char **argV;
// Setup the window and fixed grid
gtk_init(&argC, &argV);
LinuxWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
Box = gtk_fixed_new();
// Set the title
gtk_window_set_title(GTK_WINDOW(LinuxWindow), "Title");
// Setup the window events
gtk_widget_show_all(LinuxWindow);
g_signal_connect(G_OBJECT(LinuxWindow), "destroy", G_CALLBACK(gtk_main_quit),
NULL);
// Add controls
Button = gtk_button_new_with_label("Click Me!");
g_signal_connect(Button, "clicked", G_CALLBACK(buttonMessage), NULL);
gtk_fixed_put(GTK_FIXED(Box), Button, 20, 20);
gtk_fixed_move(GTK_FIXED(Box), Button, 20, 20);
gtk_widget_set_size_request(Button, 30, 100);
gtk_container_add(GTK_CONTAINER(LinuxWindow), Box);
gtk_widget_show_all(LinuxWindow);
// Create a dialog
GtkWidget *dialog;
dialog = gtk_message_dialog_new(
GTK_WINDOW(LinuxWindow), GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_INFO, GTK_BUTTONS_OK, "Hello and welcome to my GTK GUI...", NULL);
gint ret = gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(GTK_WIDGET(dialog));
printf("%i", ret);
// Add the fixed grid and go the to the main window loop
gtk_main();
return 0;
}
I am compiling it using
g++ -std=c++17 -m64 -o gtkTest myGtkApp.cpp -lX11 `pkg-config --cflags gtk+-3.0` `pkg-config --libs gtk+-3.0`
I want to detect if the window is focused and print it to the console.

Answer 1

There is a function: gtk_widget_is_focus ().
You need to assure parents have the "has-focus" property set.
Doc. excerpt:
gtk_widget_is_focus (GtkWidget *widget);
Determines if the widget is the focus widget within its toplevel. (This does not mean that the “has-focus” property is necessarily set; “has-focus” will only be set if the toplevel widget additionally has the global input focus.)
If you want to receive an event when the window is focused then register a callback for the enter-notify-event (signal)
In the linked doc. there is a section just three points after enter-notify-event that is what you want:
The “focus” signal
Sorry, I should have to mention this event the first time.