4 files changed, 21 insertions, 4 deletions

diff --git a/include/swaybar/bar.h b/include/swaybar/bar.h
index dfadc200..031993b5 100644
--- a/include/swaybar/bar.h
+++ b/include/swaybar/bar.h
@@ -58,6 +58,7 @@ struct swaybar_output {
         struct zxdg_output_v1 *xdg_output;
         struct wl_surface *surface;
         struct zwlr_layer_surface_v1 *layer_surface;
+        struct wl_region *input_region;
         uint32_t wl_name;
 
         struct wl_list workspaces; // swaybar_workspace::link
diff --git a/sway/commands/bar/mode.c b/sway/commands/bar/mode.c
index 68a80abf..1081ad4b 100644
--- a/sway/commands/bar/mode.c
+++ b/sway/commands/bar/mode.c
@@ -20,6 +20,8 @@ static struct cmd_results *bar_set_mode(struct bar_config *bar, const char *mode
                 bar->mode = strdup("hide");
         } else if (strcasecmp("invisible", mode) == 0) {
                 bar->mode = strdup("invisible");
+        } else if (strcasecmp("overlay", mode) == 0) {
+                bar->mode = strdup("overlay");
         } else {
                 return cmd_results_new(CMD_INVALID, "Invalid value %s", mode);
         }
diff --git a/sway/sway-bar.5.scd b/sway/sway-bar.5.scd
index 13827e5e..1f4ceaf2 100644
--- a/sway/sway-bar.5.scd
+++ b/sway/sway-bar.5.scd
@@ -84,11 +84,13 @@ Sway allows configuring swaybar in the sway configuration file.
         debug-events`. To disable the default behavior for a button, use the
         command _nop_.
 
-*mode* dock|hide|invisible
+*mode* dock|hide|invisible|overlay
         Specifies the visibility of the bar. In _dock_ mode, it is permanently
         visible at one edge of the screen. In _hide_ mode, it is hidden unless the
         modifier key is pressed, though this behaviour depends on the hidden state.
-        In _invisible_ mode, it is permanently hidden. Default is _dock_.
+        In _invisible_ mode, it is permanently hidden. In _overlay_ mode, it is
+        permanently visible on top of other windows. (In _overlay_ mode the bar is
+        transparent to input events.) Default is _dock_.
 
 *hidden_state* hide|show
         Specifies the behaviour of the bar when it is in _hide_ mode. When the
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);
         }
 }