feat(display): Initial widget/status screen work.

* Battery and output status widgets
* Built in status screen combining them.
* Ability to define a custom status screen factory
  function.

3 files changed, 47 insertions, 0 deletions

diff --git a/app/include/zmk/display/status_screen.h b/app/include/zmk/display/status_screen.h
new file mode 100644
index 0000000..34660ad
--- /dev/null
+++ b/app/include/zmk/display/status_screen.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <lvgl.h>
+
+lv_obj_t *zmk_display_status_screen();
\ No newline at end of file
diff --git a/app/include/zmk/display/widgets/battery_status.h b/app/include/zmk/display/widgets/battery_status.h
new file mode 100644
index 0000000..b87e87e
--- /dev/null
+++ b/app/include/zmk/display/widgets/battery_status.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <lvgl.h>
+#include <kernel.h>
+
+struct zmk_widget_battery_status {
+    sys_snode_t node;
+    lv_obj_t *obj;
+};
+
+int zmk_widget_battery_status_init(struct zmk_widget_battery_status *widget, lv_obj_t *parent);
+lv_obj_t *zmk_widget_battery_status_obj(struct zmk_widget_battery_status *widget);
\ No newline at end of file
diff --git a/app/include/zmk/display/widgets/output_status.h b/app/include/zmk/display/widgets/output_status.h
new file mode 100644
index 0000000..66f0927
--- /dev/null
+++ b/app/include/zmk/display/widgets/output_status.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <lvgl.h>
+#include <kernel.h>
+
+struct zmk_widget_output_status {
+    sys_snode_t node;
+    lv_obj_t *obj;
+};
+
+int zmk_widget_output_status_init(struct zmk_widget_output_status *widget, lv_obj_t *parent);
+lv_obj_t *zmk_widget_output_status_obj(struct zmk_widget_output_status *widget);
\ No newline at end of file