MultiMonitor.h

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#ifndef _GTKUTIL_MULTIMON_H_
#define _GTKUTIL_MULTIMON_H_

#include <gtk/gtkwindow.h>
#include <gdk/gdkscreen.h>
#include <gdk/gdkdisplay.h>
#include "itextstream.h"

namespace gtkutil
{

    class MultiMonitor
    {
        public:
            static int getNumMonitors ()
            {
                // Acquire the default screen reference
                GdkScreen* screen = gdk_display_get_default_screen(gdk_display_get_default());

                // Get and return the number of monitors
                return gdk_screen_get_n_monitors(screen);
            }

            static GdkRectangle getMonitor (int monitorNum)
            {
                GdkScreen* screen = gdk_display_get_default_screen(gdk_display_get_default());

                GdkRectangle geom;
                gdk_screen_get_monitor_geometry(screen, monitorNum, &geom);

                return geom;
            }

            static GdkRectangle getMonitorForWindow (GtkWindow* window)
            {
                // Retrieve the screen
                GdkScreen* scr = gtk_window_get_screen(GTK_WINDOW(window));

                // Get the monitor which the GtkWindow is displayed on
                gint monitorNum = gdk_screen_get_monitor_at_window(scr, GTK_WIDGET(window)->window);

                return getMonitor(monitorNum);
            }

            static void printMonitorInfo ()
            {
                globalOutputStream() << "Default screen has " << getNumMonitors() << " monitors.\n";

                // detect multiple monitors
                for (int j = 0; j < getNumMonitors(); j++) {
                    GdkRectangle geom = getMonitor(j);

                    globalOutputStream() << "Monitor " << j << " geometry: " << geom.width << "x" << geom.height
                            << " at " << geom.x << ", " << geom.y << "\n";
                }
            }
    };

} // namespace gtkutil

#endif /* _GTKUTIL_MULTIMON_H_ */