Implement save_and_quit_callback for linux

base/sources/backends/linux_system.c

@@ -1322,3 +1322,40 @@ bool iron_gamepad_connected(int gamepad) {
 void iron_gamepad_rumble(int gamepad, float left, float right) {}
 
 #endif
+
+#ifdef WITH_NFD // Has gtk
+#include <gtk/gtk.h>
+extern void (*iron_save_and_quit)(bool);
+
+bool _save_and_quit_callback_internal() {
+	bool save = false;
+	XTextProperty text_prop;
+	XGetTextProperty(x11_ctx.display, x11_ctx.windows[0].window, &text_prop, NET_WM_NAME);
+	char *title = (char *)text_prop.value;
+	bool dirty = strstr(title, "* - ArmorPaint") != NULL;
+	// XFree(title);
+	if (dirty) {
+		gtk_init(NULL, NULL);
+		GtkWidget *dialog = gtk_message_dialog_new(NULL, GTK_DIALOG_MODAL, GTK_MESSAGE_WARNING, GTK_BUTTONS_YES_NO, "Project has been modified, save changes?");
+		gtk_window_set_title(GTK_WINDOW(dialog), "Save Changes?");
+		gtk_widget_realize(dialog);
+		gint res = gtk_dialog_run(GTK_DIALOG(dialog));
+		gtk_widget_destroy(dialog);
+		while (g_main_context_pending(NULL)) {
+			g_main_context_iteration(NULL, FALSE);
+		}
+		if (res == GTK_RESPONSE_YES) {
+			save = true;
+		}
+		else if (res == GTK_RESPONSE_NO) {
+			save = false;
+		}
+		else {
+			return false;
+		}
+	}
+	iron_save_and_quit(save);
+	return false;
+}
+
+#endif

base/sources/iron.h

@@ -185,7 +185,6 @@ void _kickstart();
 bool enable_window = true;
 bool in_background = false;
 int paused_frames = 0;
-bool save_and_quit_callback_set = false;
 #ifdef IDLE_SLEEP
 bool input_down = false;
 int last_window_width = 0;
@@ -1405,7 +1404,11 @@ void iron_file_download(string_t *url, void (*callback)(char *, buffer_t *), i32
 	iron_https_request(url_base, url_path, NULL, 443, 0, &_https_callback, cbd);
 }
 
-bool _window_close_callback(void *data) {
+#ifdef IRON_LINUX
+bool _save_and_quit_callback_internal();
+#endif
+
+bool _save_and_quit_callback(void *data) {
 	#ifdef IRON_WINDOWS
 	bool save = false;
 	wchar_t title[1024];
@@ -1423,18 +1426,21 @@ bool _window_close_callback(void *data) {
 			return false;
 		}
 	}
-	if (save_and_quit_callback_set) {
-		iron_save_and_quit(save);
-		return false;
-	}
+	iron_save_and_quit(save);
+	return false;
 	#endif
+
+	#if defined(IRON_LINUX) && defined(WITH_NFD) // Has gtk
+	_save_and_quit_callback_internal();
+	return false;
+	#endif
+
 	return true;
 }
 
 void iron_set_save_and_quit_callback(void (*callback)(bool)) {
 	iron_save_and_quit = callback;
-	save_and_quit_callback_set = true;
-	iron_window_set_close_callback(_window_close_callback, NULL);
+	iron_window_set_close_callback(_save_and_quit_callback, NULL);
 }
 
 void iron_delay_idle_sleep() {