Merge pull request #42 from petejohanson/core/event-manager-refactor

Refactor to generic event manager, ditch "global behaviors" as a concept.

1 files changed, 71 insertions, 0 deletions

diff --git a/app/include/zmk/event-manager.h b/app/include/zmk/event-manager.h
new file mode 100644
index 0000000..2ef55e9
--- /dev/null
+++ b/app/include/zmk/event-manager.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+ 
+#pragma once
+
+#include <stddef.h>
+#include <kernel.h>
+#include <zephyr/types.h>
+
+struct zmk_event_type
+{
+    const char *name;
+};
+
+struct zmk_event_header {
+    const struct zmk_event_type* event;
+};
+
+typedef int (*zmk_listener_callback_t)(const struct zmk_event_header *eh);
+struct zmk_listener
+{
+    zmk_listener_callback_t callback;
+};
+
+struct zmk_event_subscription {
+    const struct zmk_event_type *event_type;
+    const struct zmk_listener *listener;
+};
+
+#define ZMK_EVENT_DECLARE(event_type) \
+    struct event_type* new_##event_type(); \
+    bool is_##event_type(const struct zmk_event_header *eh); \
+    const struct event_type* cast_##event_type(const struct zmk_event_header *eh); \
+    extern const struct zmk_event_type zmk_event_##event_type;
+
+#define ZMK_EVENT_IMPL(event_type) \
+    const struct zmk_event_type zmk_event_##event_type = { \
+        .name = STRINGIFY(event_type) \
+    }; \
+    const struct zmk_event_type* zmk_event_ref_##event_type __used __attribute__((__section__(".event_type"))) = &zmk_event_##event_type; \
+    struct event_type* new_##event_type() { \
+        struct event_type* ev = (struct event_type *) k_malloc(sizeof(struct event_type)); \
+        ev->header.event = &zmk_event_##event_type; \
+        return ev; \
+    }; \
+    bool is_##event_type(const struct zmk_event_header *eh) { \
+        return eh->event == &zmk_event_##event_type; \
+    }; \
+    const struct event_type* cast_##event_type(const struct zmk_event_header *eh) {\
+        return (const struct event_type*)eh; \
+    };
+    
+
+#define ZMK_LISTENER(mod, cb) \
+    const struct zmk_listener zmk_listener_##mod = { \
+        .callback = cb \
+    };
+
+#define ZMK_SUBSCRIPTION(mod, ev_type) \
+    const Z_DECL_ALIGN(struct zmk_event_subscription) _CONCAT(_CONCAT(zmk_event_sub_,mod),ev_type) __used __attribute__((__section__(".event_subscription"))) = { \
+        .event_type = &zmk_event_##ev_type, \
+        .listener = &zmk_listener_##mod, \
+    };
+
+#define ZMK_EVENT_RAISE(ev) \
+    zmk_event_manager_raise((struct zmk_event_header *)ev);
+
+int zmk_event_manager_raise(struct zmk_event_header *event);