Show a confirmed shutdown screen before cutting power (#555)

2026-07-10 02:49:46 -04:00
parent 7a7f09be35
commit 0922c4d55b
4 changed files with 122 additions and 13 deletions
@@ -29,6 +29,14 @@ public:
    /** For e-paper screens */
    virtual void requestFullRefresh() {}

+    /** Blocks until any frame already handed to this display has physically
+     * finished drawing. Displays that draw synchronously within their flush
+     * callback can rely on the default no-op; displays with an asynchronous
+     * refresh pipeline (e.g. e-paper, where a full refresh can take seconds)
+     * should override this so callers can safely do something irreversible
+     * (like cutting power) right after a screen update. */
+    virtual void waitForFlushComplete() {}
+
    /** Could return nullptr if not started */
    virtual std::shared_ptr<touch::TouchDevice> getTouchDevice() = 0;