ewmh: add modal windows support and a modal layout

Signed-off-by: Julien Danjou <julien@danjou.info>

client.c

@@ -299,7 +299,7 @@ client_raise(client_t *c)
     /* Push c on top of the stack. */
     stack_client_push(c);
 
-    for(layer = LAYER_FULLSCREEN; layer >= LAYER_DESKTOP; layer--)
+    for(layer = LAYER_OUTOFSPACE - 1; layer >= LAYER_DESKTOP; layer--)
         for(node = globalconf.stack; node; node = node->next)
             if(node->client->layer == layer
                && client_isvisible_anyscreen(node->client))

ewmh.c

@@ -54,6 +54,7 @@ static xcb_atom_t net_wm_state_skip_taskbar;
 static xcb_atom_t net_wm_state_fullscreen;
 static xcb_atom_t net_wm_state_above;
 static xcb_atom_t net_wm_state_below;
+static xcb_atom_t net_wm_state_modal;
 
 static xcb_atom_t utf8_string;
 
@@ -88,6 +89,7 @@ static AtomItem AtomNames[] =
     { "_NET_WM_STATE_FULLSCREEN", &net_wm_state_fullscreen },
     { "_NET_WM_STATE_ABOVE", &net_wm_state_above },
     { "_NET_WM_STATE_BELOW", &net_wm_state_below },
+    { "_NET_WM_STATE_MODAL", &net_wm_state_modal },
 
     { "UTF8_STRING", &utf8_string },
 };
@@ -155,6 +157,7 @@ ewmh_set_supported_hints(int phys_screen)
     atom[i++] = net_wm_state_fullscreen;
     atom[i++] = net_wm_state_above;
     atom[i++] = net_wm_state_below;
+    atom[i++] = net_wm_state_modal;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
 			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
@@ -313,9 +316,7 @@ ewmh_process_state_atom(client_t *c, xcb_atom_t state, int set)
     else if(state == net_wm_state_above)
     {
         if(set == _NET_WM_STATE_REMOVE)
-        {
             c->layer = c->oldlayer;
-        }
         else if(set == _NET_WM_STATE_ADD)
         {
             c->oldlayer = c->layer;
@@ -325,15 +326,23 @@ ewmh_process_state_atom(client_t *c, xcb_atom_t state, int set)
     else if(state == net_wm_state_below)
     {
         if(set == _NET_WM_STATE_REMOVE)
-        {
             c->layer = c->oldlayer;
-        }
         else if(set == _NET_WM_STATE_ADD)
         {
             c->oldlayer = c->layer;
             c->layer = LAYER_BELOW;
         }
     }
+    else if(state == net_wm_state_modal)
+    {
+        if(set == _NET_WM_STATE_REMOVE)
+            c->layer = c->oldlayer;
+        else if(set == _NET_WM_STATE_ADD)
+        {
+            c->oldlayer = c->layer;
+            c->layer = LAYER_MODAL;
+        }
+    }
 
 }
 
@@ -359,7 +368,7 @@ ewmh_process_window_type_atom(client_t *c, xcb_atom_t state)
         client_setfloating(c, true, LAYER_ABOVE);
     }
     else if (state == net_wm_window_type_dialog)
-        client_setfloating(c, true, LAYER_ABOVE);
+        client_setfloating(c, true, LAYER_MODAL);
 }
 
 void

structs.h

@@ -40,7 +40,9 @@ typedef enum
     LAYER_TILE,
     LAYER_FLOAT,
     LAYER_ABOVE,
-    LAYER_FULLSCREEN
+    LAYER_FULLSCREEN,
+    LAYER_MODAL,
+    LAYER_OUTOFSPACE
 } layer_t;
 
 /** Cursors */