Add ToggleKeybinds action

This can be used to better control Virtual Machines, VNC clients, nested
compositors or similar. All keybinds other than ToggleKeybinds itself are
disabled when first called, a 2nd call will restore handling of all keybinds.

Fixes #738
Fixes #810

docs/labwc-actions.5.scd

@@ -74,6 +74,12 @@ Actions are used in menus and keyboard/mouse bindings.
 *<action name="ToggleAlwaysOnTop">*
 	Toggle always-on-top of focused window.
 
+*<action name="ToggleKeybinds">*
+	Stop handling keybinds other than ToggleKeybinds itself.
+	This can be used to allow A-Tab and similar keybinds to be delivered
+	to Virtual Machines, VNC clients or nested compositors.
+	A second call will restore all original keybinds.
+
 *<action name="GoToDesktop" to="value" />*
 	Switch to workspace. Supported values are "last", "left", "right" or the
 	full name of a workspace or its index (starting at 1) as configured in

include/action.h

@@ -22,6 +22,8 @@ struct action *action_create(const char *action_name);
 void action_arg_add_str(struct action *action, char *key, const char *value);
 void action_arg_from_xml_node(struct action *action, char *nodename, char *content);
 
+bool actions_contain_toggle_keybinds(struct wl_list *action_list);
+
 void actions_run(struct view *activator, struct server *server,
 	struct wl_list *actions, uint32_t resize_edges);
 void action_list_free(struct wl_list *action_list);

include/labwc.h

@@ -121,6 +121,9 @@ struct seat {
 	struct wlr_idle *wlr_idle;
 	struct wlr_idle_inhibit_manager_v1 *wlr_idle_inhibit_manager;
 
+	/* In support for ToggleKeybinds */
+	bool inhibit_keybinds;
+
 	/* Used to hide the workspace OSD after switching workspaces */
 	struct wl_event_source *workspace_osd_timer;
 	bool workspace_osd_shown_by_modifier;

src/action.c

@@ -59,7 +59,8 @@ enum action_type {
 	ACTION_TYPE_RESIZE,
 	ACTION_TYPE_GO_TO_DESKTOP,
 	ACTION_TYPE_SEND_TO_DESKTOP,
-	ACTION_TYPE_SNAP_TO_REGION
+	ACTION_TYPE_SNAP_TO_REGION,
+	ACTION_TYPE_TOGGLE_KEYBINDS,
 };
 
 const char *action_names[] = {
@@ -88,6 +89,7 @@ const char *action_names[] = {
 	"GoToDesktop",
 	"SendToDesktop",
 	"SnapToRegion",
+	"ToggleKeybinds",
 	NULL
 };
 
@@ -169,6 +171,18 @@ action_create(const char *action_name)
 	return action;
 }
 
+bool
+actions_contain_toggle_keybinds(struct wl_list *action_list)
+{
+	struct action *action;
+	wl_list_for_each(action, action_list, link) {
+		if (action->type == ACTION_TYPE_TOGGLE_KEYBINDS) {
+			return true;
+		}
+	}
+	return false;
+}
+
 void action_list_free(struct wl_list *action_list)
 {
 	struct action_arg *arg, *arg_tmp;
@@ -451,6 +465,11 @@ actions_run(struct view *activator, struct server *server,
 				wlr_log(WLR_ERROR, "Invalid SnapToRegion id: '%s'", region_name);
 			}
 			break;
+		case ACTION_TYPE_TOGGLE_KEYBINDS:
+			server->seat.inhibit_keybinds = !server->seat.inhibit_keybinds;
+			wlr_log(WLR_DEBUG, "%s keybinds",
+				server->seat.inhibit_keybinds ? "Disabled" : "Enabled");
+			break;
 		case ACTION_TYPE_INVALID:
 			wlr_log(WLR_ERROR, "Not executing unknown action");
 			break;

src/keyboard.c

@@ -86,6 +86,10 @@ handle_keybinding(struct server *server, uint32_t modifiers, xkb_keysym_t sym)
 		if (modifiers ^ keybind->modifiers) {
 			continue;
 		}
+		if (server->seat.inhibit_keybinds
+				&& !actions_contain_toggle_keybinds(&keybind->actions)) {
+			continue;
+		}
 		for (size_t i = 0; i < keybind->keysyms_len; i++) {
 			if (xkb_keysym_to_lower(sym) == keybind->keysyms[i]) {
 				key_state_store_pressed_keys_as_bound();