Unused variable guint old
[mikachu/openbox.git] / openbox / screen.c
index 93ec57f..1f95bc6 100644 (file)
@@ -33,6 +33,7 @@
 #include "frame.h"
 #include "event.h"
 #include "focus.h"
+#include "focus_cycle.h"
 #include "popup.h"
 #include "extensions.h"
 #include "render/render.h"
                         ButtonPressMask | ButtonReleaseMask)
 
 static gboolean screen_validate_layout(ObDesktopLayout *l);
-static gboolean replace_wm();
-static void     screen_tell_ksplash();
-static void     screen_fallback_focus();
-
-guint    screen_num_desktops;
-guint    screen_num_monitors;
-guint    screen_desktop;
-guint    screen_last_desktop;
-Size     screen_physical_size;
-gboolean screen_showing_desktop;
+static gboolean replace_wm(void);
+static void     screen_tell_ksplash(void);
+static void     screen_fallback_focus(void);
+
+guint           screen_num_desktops;
+guint           screen_num_monitors;
+guint           screen_desktop;
+guint           screen_last_desktop;
+gboolean        screen_showing_desktop;
 ObDesktopLayout screen_desktop_layout;
-gchar  **screen_desktop_names;
-Window   screen_support_win;
-Time     screen_desktop_user_time = CurrentTime;
-
-/*! An array of desktops, holding array of areas per monitor */
+gchar         **screen_desktop_names;
+Window          screen_support_win;
+Time            screen_desktop_user_time = CurrentTime;
+
+static Size     screen_physical_size;
+static guint    screen_old_desktop;
+static gboolean screen_desktop_timeout = TRUE;
+/*! An array of desktops, holding an array of areas per monitor */
 static Rect  *monitor_area = NULL;
 /*! An array of desktops, holding an array of struts */
 static GSList *struts_top = NULL;
@@ -77,7 +80,11 @@ static GSList *struts_bottom = NULL;
 
 static ObPagerPopup *desktop_popup;
 
-static gboolean replace_wm()
+/*! The number of microseconds that you need to be on a desktop before it will
+  replace the remembered "last desktop" */
+#define REMEMBER_LAST_DESKTOP_TIME 750000
+
+static gboolean replace_wm(void)
 {
     gchar *wm_sn;
     Atom wm_sn_atom;
@@ -149,7 +156,7 @@ static gboolean replace_wm()
     return TRUE;
 }
 
-gboolean screen_annex()
+gboolean screen_annex(void)
 {
     XSetWindowAttributes attrib;
     pid_t pid;
@@ -283,6 +290,8 @@ gboolean screen_annex()
     supported[i++] = prop_atoms.net_wm_sync_request;
     supported[i++] = prop_atoms.net_wm_sync_request_counter;
 #endif
+    supported[i++] = prop_atoms.net_wm_pid;
+    supported[i++] = prop_atoms.net_wm_ping;
 
     supported[i++] = prop_atoms.kde_wm_change_state;
     supported[i++] = prop_atoms.kde_net_wm_frame_strut;
@@ -292,19 +301,28 @@ gboolean screen_annex()
     supported[i++] = prop_atoms.ob_wm_state_undecorated;
     supported[i++] = prop_atoms.openbox_pid;
     supported[i++] = prop_atoms.ob_theme;
+    supported[i++] = prop_atoms.ob_config_file;
     supported[i++] = prop_atoms.ob_control;
+    supported[i++] = prop_atoms.ob_version;
+    supported[i++] = prop_atoms.ob_app_role;
+    supported[i++] = prop_atoms.ob_app_name;
+    supported[i++] = prop_atoms.ob_app_class;
+    supported[i++] = prop_atoms.ob_app_type;
     g_assert(i == num_support);
 
     PROP_SETA32(RootWindow(ob_display, ob_screen),
                 net_supported, atom, supported, num_support);
     g_free(supported);
 
+    PROP_SETS(RootWindow(ob_display, ob_screen), ob_version,
+              OB_VERSION);
+
     screen_tell_ksplash();
 
     return TRUE;
 }
 
-static void screen_tell_ksplash()
+static void screen_tell_ksplash(void)
 {
     XEvent e;
     char **argv;
@@ -331,7 +349,7 @@ static void screen_tell_ksplash()
     e.xclient.display = ob_display;
     e.xclient.window = RootWindow(ob_display, ob_screen);
     e.xclient.message_type =
-        XInternAtom(ob_display, "_KDE_SPLASH_PROGRESS", False );
+        XInternAtom(ob_display, "_KDE_SPLASH_PROGRESS", False);
     e.xclient.format = 8;
     strcpy(e.xclient.data.b, "wm started");
     XSendEvent(ob_display, RootWindow(ob_display, ob_screen),
@@ -344,7 +362,7 @@ void screen_startup(gboolean reconfig)
     guint32 d;
     gboolean namesexist = FALSE;
 
-    desktop_popup = pager_popup_new(FALSE);
+    desktop_popup = pager_popup_new();
     pager_popup_height(desktop_popup, POPUP_HEIGHT);
 
     if (reconfig) {
@@ -394,7 +412,17 @@ void screen_startup(gboolean reconfig)
     screen_num_desktops = 0;
     if (PROP_GET32(RootWindow(ob_display, ob_screen),
                    net_number_of_desktops, cardinal, &d))
+    {
+        if (d != config_desktops_num) {
+            /* TRANSLATORS: If you need to specify a different order of the
+               arguments, you can use %1$d for the first one and %2$d for the
+               second one. For example,
+               "The current session has %2$d desktops, but Openbox is configured for %1$d ..." */
+            g_warning(ngettext("Openbox is configured for %d desktop, but the current session has %d.  Overriding the Openbox configuration.", "Openbox is configured for %d desktops, but the current session has %d.  Overriding the Openbox configuration.", config_desktops_num),
+                      config_desktops_num, d);
+        }
         screen_set_num_desktops(d);
+    }
     /* restore from session if possible */
     else if (session_num_desktops)
         screen_set_num_desktops(session_num_desktops);
@@ -453,7 +481,7 @@ void screen_shutdown(gboolean reconfig)
     screen_desktop_names = NULL;
 }
 
-void screen_resize()
+void screen_resize(void)
 {
     static gint oldw = 0, oldh = 0;
     gint w, h;
@@ -473,7 +501,7 @@ void screen_resize()
     PROP_SETA32(RootWindow(ob_display, ob_screen),
                 net_desktop_geometry, cardinal, geometry, 2);
 
-    if (ob_state() == OB_STATE_STARTING)
+    if (ob_state() != OB_STATE_RUNNING)
         return;
 
     screen_update_areas();
@@ -485,7 +513,6 @@ void screen_resize()
 
 void screen_set_num_desktops(guint num)
 {
-    guint old;
     gulong *viewport;
     GList *it, *stacking_copy;
 
@@ -493,7 +520,6 @@ void screen_set_num_desktops(guint num)
 
     if (screen_num_desktops == num) return;
 
-    old = screen_num_desktops;
     screen_num_desktops = num;
     PROP_SET32(RootWindow(ob_display, ob_screen),
                net_number_of_desktops, cardinal, num);
@@ -523,12 +549,13 @@ void screen_set_num_desktops(guint num)
                 stacking_raise(CLIENT_AS_WINDOW(c));
         }
     }
+    g_list_free(stacking_copy);
 
     /* change our struts/area to match (after moving windows) */
     screen_update_areas();
 
     /* may be some unnamed desktops that we need to fill in with names
-     (after updating the areas so the popup can resize) */
+       (after updating the areas so the popup can resize) */
     screen_update_desktop_names();
 
     /* change our desktop if we're on one that no longer exists! */
@@ -536,7 +563,7 @@ void screen_set_num_desktops(guint num)
         screen_set_desktop(num - 1, TRUE);
 }
 
-static void screen_fallback_focus()
+static void screen_fallback_focus(void)
 {
     ObClient *c;
     gboolean allow_omni;
@@ -577,26 +604,101 @@ static void screen_fallback_focus()
     }
 }
 
+static gboolean last_desktop_func(gpointer data)
+{
+    screen_desktop_timeout = TRUE;
+    return FALSE;
+}
+
 void screen_set_desktop(guint num, gboolean dofocus)
 {
     GList *it;
-    guint old;
+    guint previous;
     gulong ignore_start;
 
     g_assert(num < screen_num_desktops);
 
-    old = screen_desktop;
+    previous = screen_desktop;
     screen_desktop = num;
 
-    if (old == num) return;
+    if (previous == num) return;
 
     PROP_SET32(RootWindow(ob_display, ob_screen),
                net_current_desktop, cardinal, num);
 
-    screen_last_desktop = old;
+    /* This whole thing decides when/how to save the screen_last_desktop so
+       that it can be restored later if you want */
+    if (screen_desktop_timeout) {
+        /* If screen_desktop_timeout is true, then we've been on this desktop
+           long enough and we can save it as the last desktop. */
+
+        if (screen_last_desktop == previous)
+            /* this is the startup state only */
+            screen_old_desktop = screen_desktop;
+        else {
+            /* save the "last desktop" as the "old desktop" */
+            screen_old_desktop = screen_last_desktop;
+            /* save the desktop we're coming from as the "last desktop" */
+            screen_last_desktop = previous;
+        }
+    }
+    else {
+        /* If screen_desktop_timeout is false, then we just got to this desktop
+           and we are moving away again. */
+
+        if (screen_desktop == screen_last_desktop) {
+            /* If we are moving to the "last desktop" .. */
+            if (previous == screen_old_desktop) {
+                /* .. from the "old desktop", change the last desktop to
+                   be where we are coming from */
+                screen_last_desktop = screen_old_desktop;
+            }
+            else if (screen_last_desktop == screen_old_desktop) {
+                /* .. and also to the "old desktop", change the "last
+                   desktop" to be where we are coming from */
+                screen_last_desktop = previous;
+            }
+            else {
+                /* .. from some other desktop, then set the "last desktop" to
+                   be the saved "old desktop", i.e. where we were before the
+                   "last desktop" */
+                screen_last_desktop = screen_old_desktop;
+            }
+        }
+        else {
+            /* If we are moving to any desktop besides the "last desktop"..
+               (this is the normal case) */
+            if (screen_desktop == screen_old_desktop) {
+                /* If moving to the "old desktop", which is not the
+                   "last desktop", don't save anything */
+            }
+            else if (previous == screen_old_desktop) {
+                /* If moving from the "old desktop", and not to the
+                   "last desktop", don't save anything */
+            }
+            else if (screen_last_desktop == screen_old_desktop) {
+                /* If the "last desktop" is the same as "old desktop" and
+                   you're not moving to the "last desktop" then save where
+                   we're coming from as the "last desktop" */
+                screen_last_desktop = previous;
+            }
+            else {
+                /* If the "last desktop" is different from the "old desktop"
+                   and you're not moving to the "last desktop", then don't save
+                   anything */
+            }
+        }
+    }
+    screen_desktop_timeout = FALSE;
+    ob_main_loop_timeout_remove(ob_main_loop, last_desktop_func);
+    ob_main_loop_timeout_add(ob_main_loop, REMEMBER_LAST_DESKTOP_TIME,
+                             last_desktop_func, NULL, NULL, NULL);
 
     ob_debug("Moving to desktop %d\n", num+1);
 
+    if (ob_state() == OB_STATE_RUNNING)
+        screen_show_desktop_popup(screen_desktop);
+
     /* ignore enter events caused by the move */
     ignore_start = event_start_ignore_all_enters();
 
@@ -619,17 +721,28 @@ void screen_set_desktop(guint num, gboolean dofocus)
     for (it = g_list_last(stacking_list); it; it = g_list_previous(it)) {
         if (WINDOW_IS_CLIENT(it->data)) {
             ObClient *c = it->data;
-            client_hide(c);
+            if (client_hide(c)) {
+                if (c == focus_client) {
+                    /* c was focused and we didn't do fallback clearly so make
+                       sure openbox doesnt still consider the window focused.
+                       this happens when using NextWindow with allDesktops,
+                       since it doesnt want to move focus on desktop change,
+                       but the focus is not going to stay with the current
+                       window, which has now disappeared.
+                       only do this if the client was actually hidden,
+                       otherwise it can keep focus. */
+                    focus_set_client(NULL);
+                }
+            }
         }
     }
 
+    focus_cycle_addremove(NULL, TRUE);
+
     event_end_ignore_all_enters(ignore_start);
 
     if (event_curtime != CurrentTime)
         screen_desktop_user_time = event_curtime;
-
-    if (ob_state() == OB_STATE_RUNNING)
-        screen_show_desktop_popup(screen_desktop);
 }
 
 void screen_add_desktop(gboolean current)
@@ -707,6 +820,7 @@ void screen_remove_desktop(gboolean current)
             }
         }
     }
+    g_list_free(stacking_copy);
 
     /* fallback focus like we're changing desktops */
     if (screen_desktop < screen_num_desktops - 1) {
@@ -840,7 +954,7 @@ void screen_show_desktop_popup(guint d)
     /* 0 means don't show the popup */
     if (!config_desktop_popup_time) return;
 
-    a = screen_physical_area_active();
+    a = screen_physical_area_primary(FALSE);
     pager_popup_position(desktop_popup, CenterGravity,
                          a->x + a->width / 2, a->y + a->height / 2);
     pager_popup_icon_size_multiplier(desktop_popup,
@@ -855,6 +969,13 @@ void screen_show_desktop_popup(guint d)
     ob_main_loop_timeout_remove(ob_main_loop, hide_desktop_popup_func);
     ob_main_loop_timeout_add(ob_main_loop, config_desktop_popup_time * 1000,
                              hide_desktop_popup_func, NULL, NULL, NULL);
+    g_free(a);
+}
+
+void screen_hide_desktop_popup(void)
+{
+    ob_main_loop_timeout_remove(ob_main_loop, hide_desktop_popup_func);
+    pager_popup_hide(desktop_popup);
 }
 
 guint screen_find_desktop(guint from, ObDirection dir,
@@ -1000,7 +1121,7 @@ static gboolean screen_validate_layout(ObDesktopLayout *l)
     return TRUE;
 }
 
-void screen_update_layout()
+void screen_update_layout(void)
 
 {
     ObDesktopLayout l;
@@ -1049,7 +1170,7 @@ void screen_update_layout()
     }
 }
 
-void screen_update_desktop_names()
+void screen_update_desktop_names(void)
 {
     guint i;
 
@@ -1173,19 +1294,6 @@ void screen_install_colormap(ObClient *client, gboolean install)
     }
 }
 
-#define STRUT_LEFT_ON_MONITOR(s, i) \
-    (RANGES_INTERSECT(s->left_start, s->left_end - s->left_start + 1, \
-                      monitor_area[i].y, monitor_area[i].height))
-#define STRUT_RIGHT_ON_MONITOR(s, i) \
-    (RANGES_INTERSECT(s->right_start, s->right_end - s->right_start + 1, \
-                      monitor_area[i].y, monitor_area[i].height))
-#define STRUT_TOP_ON_MONITOR(s, i) \
-    (RANGES_INTERSECT(s->top_start, s->top_end - s->top_start + 1, \
-                      monitor_area[i].x, monitor_area[i].width))
-#define STRUT_BOTTOM_ON_MONITOR(s, i) \
-    (RANGES_INTERSECT(s->bottom_start, s->bottom_end - s->bottom_start + 1, \
-                      monitor_area[i].x, monitor_area[i].width))
-
 typedef struct {
     guint desktop;
     StrutPartial *strut;
@@ -1211,12 +1319,11 @@ typedef struct {
     } \
 }
 
-void screen_update_areas()
+void screen_update_areas(void)
 {
-    guint i, j;
+    guint i;
     gulong *dims;
     GList *it;
-    GSList *sit;
 
     g_free(monitor_area);
     extensions_xinerama_screens(&monitor_area, &screen_num_monitors);
@@ -1231,8 +1338,6 @@ void screen_update_areas()
     config_margins.right_start = RECT_TOP(monitor_area[screen_num_monitors]);
     config_margins.right_end = RECT_BOTTOM(monitor_area[screen_num_monitors]);
 
-    dims = g_new(gulong, 4 * screen_num_desktops * screen_num_monitors);
-
     RESET_STRUT_LIST(struts_left);
     RESET_STRUT_LIST(struts_top);
     RESET_STRUT_LIST(struts_right);
@@ -1277,57 +1382,17 @@ void screen_update_areas()
     VALIDATE_STRUTS(struts_bottom, bottom,
                     monitor_area[screen_num_monitors].height / 2);
 
-    /* set up the work areas to be full screen */
-    for (i = 0; i < screen_num_monitors; ++i)
-        for (j = 0; j < screen_num_desktops; ++j) {
-            dims[(i * screen_num_desktops + j) * 4+0] = monitor_area[i].x;
-            dims[(i * screen_num_desktops + j) * 4+1] = monitor_area[i].y;
-            dims[(i * screen_num_desktops + j) * 4+2] = monitor_area[i].width;
-            dims[(i * screen_num_desktops + j) * 4+3] = monitor_area[i].height;
-        }
-
-    /* calculate the work areas from the struts */
-    for (i = 0; i < screen_num_monitors; ++i)
-        for (j = 0; j < screen_num_desktops; ++j) {
-            gint l = 0, r = 0, t = 0, b = 0;
-
-            /* only add the strut to the area if it touches the monitor */
-
-            for (sit = struts_left; sit; sit = g_slist_next(sit)) {
-                ObScreenStrut *s = sit->data;
-                if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
-                    STRUT_LEFT_ON_MONITOR(s->strut, i))
-                    l = MAX(l, s->strut->left);
-            }
-            for (sit = struts_top; sit; sit = g_slist_next(sit)) {
-                ObScreenStrut *s = sit->data;
-                if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
-                    STRUT_TOP_ON_MONITOR(s->strut, i))
-                    t = MAX(t, s->strut->top);
-            }
-            for (sit = struts_right; sit; sit = g_slist_next(sit)) {
-                ObScreenStrut *s = sit->data;
-                if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
-                    STRUT_RIGHT_ON_MONITOR(s->strut, i))
-                    r = MAX(r, s->strut->right);
-            }
-            for (sit = struts_bottom; sit; sit = g_slist_next(sit)) {
-                ObScreenStrut *s = sit->data;
-                if ((s->desktop == j || s->desktop == DESKTOP_ALL) &&
-                    STRUT_BOTTOM_ON_MONITOR(s->strut, i))
-                    b = MAX(b, s->strut->bottom);
-            }
-
-            /* based on these margins, set the work area for the
-               monitor/desktop */
-            dims[(i * screen_num_desktops + j) * 4 + 0] += l;
-            dims[(i * screen_num_desktops + j) * 4 + 1] += t;
-            dims[(i * screen_num_desktops + j) * 4 + 2] -= l + r;
-            dims[(i * screen_num_desktops + j) * 4 + 3] -= t + b;
-        }
+    dims = g_new(gulong, 4 * screen_num_desktops);
+    for (i = 0; i < screen_num_desktops; ++i) {
+        Rect *area = screen_area(i, SCREEN_AREA_ALL_MONITORS, NULL);
+        dims[i*4+0] = area->x;
+        dims[i*4+1] = area->y;
+        dims[i*4+2] = area->width;
+        dims[i*4+3] = area->height;
+        g_free(area);
+    }
 
-    /* all the work areas are not used here, only the ones for the first
-       monitor are */
+    /* set the legacy workarea hint to the union of all the monitors */
     PROP_SETA32(RootWindow(ob_display, ob_screen), net_workarea, cardinal,
                 dims, 4 * screen_num_desktops);
 
@@ -1458,28 +1523,32 @@ Rect* screen_area(guint desktop, guint head, Rect *search)
                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
                     STRUT_LEFT_IN_SEARCH(s->strut, search) &&
                     !STRUT_LEFT_IGNORE(s->strut, us, search))
-                    l = MAX(l, al + s->strut->left);
+                    l = MAX(l, RECT_LEFT(monitor_area[screen_num_monitors])
+                               + s->strut->left);
             }
             for (it = struts_top; it; it = g_slist_next(it)) {
                 ObScreenStrut *s = it->data;
                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
                     STRUT_TOP_IN_SEARCH(s->strut, search) &&
                     !STRUT_TOP_IGNORE(s->strut, us, search))
-                    t = MAX(t, at + s->strut->top);
+                    t = MAX(t, RECT_TOP(monitor_area[screen_num_monitors])
+                               + s->strut->top);
             }
             for (it = struts_right; it; it = g_slist_next(it)) {
                 ObScreenStrut *s = it->data;
                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
                     STRUT_RIGHT_IN_SEARCH(s->strut, search) &&
                     !STRUT_RIGHT_IGNORE(s->strut, us, search))
-                    r = MIN(r, ar - s->strut->right);
+                    r = MIN(r, RECT_RIGHT(monitor_area[screen_num_monitors])
+                               - s->strut->right);
             }
             for (it = struts_bottom; it; it = g_slist_next(it)) {
                 ObScreenStrut *s = it->data;
                 if ((s->desktop == d || s->desktop == DESKTOP_ALL) &&
                     STRUT_BOTTOM_IN_SEARCH(s->strut, search) &&
                     !STRUT_BOTTOM_IGNORE(s->strut, us, search))
-                    b = MIN(b, ab - s->strut->bottom);
+                    b = MIN(b, RECT_BOTTOM(monitor_area[screen_num_monitors])
+                               - s->strut->bottom);
             }
 
             /* limit to this monitor */
@@ -1503,7 +1572,7 @@ Rect* screen_area(guint desktop, guint head, Rect *search)
 guint screen_find_monitor(Rect *search)
 {
     guint i;
-    guint most = 0;
+    guint most = screen_num_monitors;
     guint mostv = 0;
 
     for (i = 0; i < screen_num_monitors; ++i) {
@@ -1525,7 +1594,7 @@ guint screen_find_monitor(Rect *search)
     return most;
 }
 
-Rect* screen_physical_area_all_monitors()
+Rect* screen_physical_area_all_monitors(void)
 {
     return screen_physical_area_monitor(screen_num_monitors);
 }
@@ -1547,27 +1616,43 @@ gboolean screen_physical_area_monitor_contains(guint head, Rect *search)
     return RECT_INTERSECTS_RECT(monitor_area[head], *search);
 }
 
-Rect* screen_physical_area_active()
+guint screen_monitor_active(void)
 {
-    Rect *a;
-    gint x, y;
-
     if (moveresize_client)
-        a = screen_physical_area_monitor(client_monitor(focus_client));
+        return client_monitor(moveresize_client);
     else if (focus_client)
-        a = screen_physical_area_monitor(client_monitor(focus_client));
-    else {
-        Rect mon;
-        if (screen_pointer_pos(&x, &y))
-            RECT_SET(mon, x, y, 1, 1);
+        return client_monitor(focus_client);
+    else
+        return screen_monitor_pointer();
+}
+
+Rect* screen_physical_area_active(void)
+{
+    return screen_physical_area_monitor(screen_monitor_active());
+}
+
+guint screen_monitor_primary(gboolean fixed)
+{
+    if (config_primary_monitor_index > 0) {
+        if (config_primary_monitor_index-1 < screen_num_monitors)
+            return config_primary_monitor_index - 1;
         else
-            RECT_SET(mon, 0, 0, 1, 1);
-        a = screen_physical_area_monitor(screen_find_monitor(&mon));
+            return 0;
     }
-    return a;
+    else if (fixed)
+        return 0;
+    else if (config_primary_monitor == OB_PLACE_MONITOR_ACTIVE)
+        return screen_monitor_active();
+    else /* config_primary_monitor == OB_PLACE_MONITOR_MOUSE */
+        return screen_monitor_pointer();
+}
+
+Rect *screen_physical_area_primary(gboolean fixed)
+{
+    return screen_physical_area_monitor(screen_monitor_primary(fixed));
 }
 
-void screen_set_root_cursor()
+void screen_set_root_cursor(void)
 {
     if (sn_app_starting())
         XDefineCursor(ob_display, RootWindow(ob_display, ob_screen),
@@ -1577,6 +1662,21 @@ void screen_set_root_cursor()
                       ob_cursor(OB_CURSOR_POINTER));
 }
 
+guint screen_find_monitor_point(guint x, guint y)
+{
+    Rect mon;
+    RECT_SET(mon, x, y, 1, 1);
+    return screen_find_monitor(&mon);
+}
+
+guint screen_monitor_pointer()
+{
+    gint x, y;
+    if (!screen_pointer_pos(&x, &y))
+        x = y = 0;
+    return screen_find_monitor_point(x, y);
+}
+
 gboolean screen_pointer_pos(gint *x, gint *y)
 {
     Window w;