swaybar: handle mode/hidden_state changes

As well as adding the hidden_state property to the bar config struct,
this commit handles barconfig_update events when the mode or
hidden_state changes, and uses a new function determine_bar_visibility
to hide or show the bar as required, using, respectively,
destroy_layer_surface, which is also newly added, and add_layer_surface,
which has been changed to allow dynamically adding the surface.

2 files changed, 19 insertions, 0 deletions

diff --git a/include/swaybar/bar.h b/include/swaybar/bar.h
index 593f4f6d..9ff3fe7b 100644
--- a/include/swaybar/bar.h
+++ b/include/swaybar/bar.h
@@ -50,6 +50,11 @@ struct swaybar {
         char *mode;
         bool mode_pango_markup;
 
+        // only relevant when bar is in "hide" mode
+        bool visible_by_modifier;
+        bool visible_by_urgency;
+        bool visible;
+
         struct wl_display *display;
         struct wl_compositor *compositor;
         struct zwlr_layer_shell_v1 *layer_shell;
@@ -104,6 +109,19 @@ bool bar_setup(struct swaybar *bar, const char *socket_path);
 void bar_run(struct swaybar *bar);
 void bar_teardown(struct swaybar *bar);
 
+/*
+ * Determines whether the bar should be visible and changes it to be so.
+ * If the current visibility of the bar is the different to what it should be,
+ * then it adds or destroys the layer surface as required,
+ * as well as sending the cont or stop signal to the status command.
+ * If the current visibility of the bar is already what it should be,
+ * then this function is a no-op, unless moving_layer is true, which occurs
+ * when the bar changes from "hide" to "dock" mode or vice versa, and the bar
+ * needs to be destroyed and re-added in order to change its layer.
+ *
+ * Returns true if the bar is now visible, otherwise false.
+ */
+bool determine_bar_visibility(struct swaybar *bar, bool moving_layer);
 void free_hotspots(struct wl_list *list);
 void free_workspaces(struct wl_list *list);
 
diff --git a/include/swaybar/config.h b/include/swaybar/config.h
index 68ee2087..10904bca 100644
--- a/include/swaybar/config.h
+++ b/include/swaybar/config.h
@@ -31,6 +31,7 @@ struct swaybar_config {
         char *font;
         char *sep_symbol;
         char *mode;
+        char *hidden_state;
         bool strip_workspace_numbers;
         bool binding_mode_indicator;
         bool wrap_scroll;