On 11/02/2010 08:01 PM, Robert Pearce wrote:
Hi Johannes,
On Tue, 2 Nov 2010 20:25:12 +1000 you wrote:
If I understand correctly, a GdkDisplay is basically an X server
instance. A monitor is, well, a monitor. GdkScreen is supposed to be
somewhere in the middle.
So, if I understand right (which is by no means certain), a GdkScreen
is the display area you can drag a window over, rather than having to
plonk it onto another screen by other means.
That's correct. A GdkDisplay is an X server instance. A single display
can manage more than one GdkScreen, and a screen can overlap more than
one GdkMonitor.
With two monitors you can have one X server with "traditional"
multi-monitor, which is two screens, one for each monitor, or you can
configure it with Xinerama, which will give you a single screen spanning
the two monitors.
By running the attached code on a dual monitor setup (two 1920x1200
monitors), you can obtain the following results, depending on whether
you have Xinerama or not
Display has 2 screens
Screen 0: 1920 x 1200 -- has 1 monitors
Monitor 0: 1920 x 1200
Screen 1: 1920 x 1200 -- has 1 monitors
Monitor 0: 1920 x 1200
And this result when using xinerama
Display has 1 screens
Screen 0: 3840 x 1200 -- has 2 monitors
Monitor 0: 1920 x 1200
Monitor 1: 1920 x 1200
O.
#include <gtk/gtk.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
int nScreens;
int i, j;
GdkDisplay *display;
gtk_init (&argc, &argv);
display = gdk_display_get_default();
nScreens = gdk_display_get_n_screens(display);
printf("Display has %d screens\n", nScreens);
for (i=0; i<nScreens; i++)
{
GdkScreen *screen;
GdkRectangle screen_rect;
int screen_w, screen_h;
int screen_w_px, screen_h_px;
int nMonitors;
screen = gdk_display_get_screen(display, i);
screen_w_px = gdk_screen_get_width(screen);
screen_h_px = gdk_screen_get_height(screen);
nMonitors = gdk_screen_get_n_monitors(screen);
printf(" Screen %d: %d x %d -- has %d monitors\n",
i,
screen_w_px, screen_h_px,
nMonitors);
for (j=0; j<nMonitors; j++)
{
GdkRectangle monitor_rect;
gdk_screen_get_monitor_geometry(screen, j, &monitor_rect);
printf(" Monitor %d: %d x %d\n",
j,
monitor_rect.width, monitor_rect.height);
}
}
}
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