Add CSD to border modes

This replaces view.using_csd with a new border mode: B_CSD. This also
removes sway_xdg_shell{_v6}_view.deco_mode and
view->has_client_side_decorations as we can now get these from the
border.

You can use `border toggle` to cycle through the modes including CSD, or
use `border csd` to set it directly. The client must support the
xdg-decoration protocol, and the only client I know of that does is the
example in wlroots.

If the client switches from SSD to CSD without us expecting it (via the
server-decoration protocol), we stash the previous border type into
view.saved_border so we can restore it if the client returns to SSD. I
haven't found a way to test this though.

1 files changed, 23 insertions, 14 deletions

diff --git a/sway/tree/view.c b/sway/tree/view.c
index e370443c..c370de2d 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -5,6 +5,8 @@
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/types/wlr_buffer.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_server_decoration.h>
+#include <wlr/types/wlr_xdg_decoration_v1.h>
 #include "config.h"
 #ifdef HAVE_XWAYLAND
 #include <wlr/xwayland.h>
@@ -23,6 +25,7 @@
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 #include "sway/config.h"
+#include "sway/xdg_decoration.h"
 #include "pango.h"
 #include "stringop.h"
 
@@ -231,12 +234,8 @@ void view_autoconfigure(struct sway_view *view) {
                 view->border_top = false;
         }
 
-        enum sway_container_border border = view->border;
-        if (view->using_csd) {
-                border = B_NONE;
-        }
-
-        switch (border) {
+        switch (view->border) {
+        case B_CSD:
         case B_NONE:
                 x = con->x;
                 y = con->y + y_offset;
@@ -309,16 +308,26 @@ void view_request_activate(struct sway_view *view) {
         }
 }
 
-void view_set_tiled(struct sway_view *view, bool tiled) {
-        if (!tiled) {
-                view->using_csd = true;
-                if (view->impl->has_client_side_decorations) {
-                        view->using_csd = view->impl->has_client_side_decorations(view);
-                }
-        } else {
-                view->using_csd = false;
+void view_set_csd_from_server(struct sway_view *view, bool enabled) {
+        if (view->xdg_decoration) {
+                uint32_t mode = enabled ?
+                        WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE :
+                        WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE;
+                wlr_xdg_toplevel_decoration_v1_set_mode(
+                                view->xdg_decoration->wlr_xdg_decoration, mode);
         }
+}
 
+void view_set_csd_from_client(struct sway_view *view, bool enabled) {
+        if (enabled && view->border != B_CSD) {
+                view->saved_border = view->border;
+                view->border = B_CSD;
+        } else if (!enabled && view->border == B_CSD) {
+                view->border = view->saved_border;
+        }
+}
+
+void view_set_tiled(struct sway_view *view, bool tiled) {
         if (view->impl->set_tiled) {
                 view->impl->set_tiled(view, tiled);
         }