swaybar: add overlay mode (fix #1620)

Overlay mode puts the bar above normal windows and passes through/ignores any
touch/mouse/keyboard events that would be sent to it.

1 files changed, 14 insertions, 2 deletions

diff --git a/swaybar/bar.c b/swaybar/bar.c
index db1c1222..ca7cd88c 100644
--- a/swaybar/bar.c
+++ b/swaybar/bar.c
@@ -51,6 +51,9 @@ static void swaybar_output_free(struct swaybar_output *output) {
         if (output->surface != NULL) {
                 wl_surface_destroy(output->surface);
         }
+        if (output->input_region != NULL) {
+                wl_region_destroy(output->input_region);
+        }
         zxdg_output_v1_destroy(output->xdg_output);
         wl_output_destroy(output->output);
         destroy_buffer(&output->buffers[0]);
@@ -100,16 +103,25 @@ static void add_layer_surface(struct swaybar_output *output) {
 
         struct swaybar_config *config = bar->config;
         bool hidden = strcmp(config->mode, "hide") == 0;
+        bool overlay = !hidden && strcmp(config->mode, "overlay") == 0;
         output->layer_surface = zwlr_layer_shell_v1_get_layer_surface(
                         bar->layer_shell, output->surface, output->output,
-                        hidden ? ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY :
+                        hidden || overlay ? ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY :
                         ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM, "panel");
         assert(output->layer_surface);
         zwlr_layer_surface_v1_add_listener(output->layer_surface,
                         &layer_surface_listener, output);
 
+        if (overlay) {
+                // Empty input region
+                output->input_region = wl_compositor_create_region(bar->compositor);
+                assert(output->input_region);
+
+                wl_surface_set_input_region(output->surface, output->input_region);
+        }
+
         zwlr_layer_surface_v1_set_anchor(output->layer_surface, config->position);
-        if (hidden) {
+        if (hidden || overlay) {
                 zwlr_layer_surface_v1_set_exclusive_zone(output->layer_surface, -1);
         }
 }