Identify topmost interactive layer post-arrange

1 files changed, 22 insertions, 0 deletions

diff --git a/sway/desktop/layer_shell.c b/sway/desktop/layer_shell.c
index c18f51c7..a187432b 100644
--- a/sway/desktop/layer_shell.c
+++ b/sway/desktop/layer_shell.c
@@ -187,6 +187,28 @@ void arrange_layers(struct sway_output *output) {
                         &usable_area, false);
         arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
                         &usable_area, false);
+
+        // Find topmost keyboard interactive layer, if such a layer exists
+        uint32_t layers_above_shell[] = {
+                ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
+                ZWLR_LAYER_SHELL_V1_LAYER_TOP,
+        };
+        size_t nlayers = sizeof(layers_above_shell) / sizeof(layers_above_shell[0]);
+        struct sway_layer_surface *layer, *topmost = NULL;
+        for (size_t i = 0; i < nlayers; ++i) {
+                wl_list_for_each_reverse(layer,
+                                &output->layers[layers_above_shell[i]], link) {
+                        if (layer->layer_surface->current.keyboard_interactive) {
+                                topmost = layer;
+                                break;
+                        }
+                }
+                if (topmost != NULL) {
+                        break;
+                }
+        }
+
+        wlr_log(L_DEBUG, "topmost layer: %p", topmost);
 }
 
 static void handle_output_destroy(struct wl_listener *listener, void *data) {