Ken Van Hoeylandt 9f721e6655
Refactor LVGL code into kernel module (#472)
* **New Features**
  * Added a standalone LVGL module and enabled LVGL support in the simulator for richer local UI testing.

* **Refactor**
  * HAL and LVGL split into distinct modules; startup and device attach/detach flows reorganized for clearer lifecycle management.
  * Public APIs tightened with clearer nullability/documentation.

* **Bug Fixes**
  * More consistent LVGL start/stop and device attach/detach behavior for improved stability.
2026-02-01 22:57:45 +01:00

122 lines
4.8 KiB
C

#pragma once
#include <tt_bundle.h>
#include <stdio.h>
#include <stdbool.h>
#include <lvgl.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef void* AppHandle;
/** Important: These values must map to tt::app::Result values exactly */
typedef enum {
APP_RESULT_OK = 0,
APP_RESULT_CANCELLED = 1,
APP_RESULT_ERROR = 2
} AppResult;
typedef unsigned int AppLaunchId;
/** Important: These function types must map to t::app types exactly. All void* data is nullable. */
typedef void* (*AppCreateData)();
typedef void (*AppDestroyData)(void* data);
typedef void (*AppOnCreate)(AppHandle app, void* data);
typedef void (*AppOnDestroy)(AppHandle app, void* data);
typedef void (*AppOnShow)(AppHandle app, void* data, lv_obj_t* parent);
typedef void (*AppOnHide)(AppHandle app, void* data);
typedef void (*AppOnResult)(AppHandle app, void* data, AppLaunchId launchId, AppResult result, BundleHandle resultData);
/** All callback types are nullable */
typedef struct {
/** The application can allocate data to re-use later (e.g. struct with state) */
AppCreateData createData;
/** If createData is specified, this one must be specified too */
AppDestroyData destroyData;
/** Called when the app is launched (started) */
AppOnCreate onCreate;
/** Called when the app is exited (stopped) */
AppOnDestroy onDestroy;
/** Called when the app is about to be shown to the user (app becomes visible) */
AppOnShow onShow;
/** Called when the app is about to be invisible to the user (e.g. other app was launched by this app, and this app goes to the background) */
AppOnHide onHide;
/** Called when the app receives a result after launching another app */
AppOnResult onResult;
} AppRegistration;
/** This is used to register the manifest of an external app. */
void tt_app_register(const AppRegistration app);
/** @return the bundle that belongs to this application, or null if it wasn't started with parameters. */
BundleHandle tt_app_get_parameters(AppHandle handle);
/**
* Set the result before closing an app.
* The result and bundle are passed along to the app that launched this app, when this app is closed.
* @param[in] handle the app handle to set the result for
* @param[in] result the result state to set
* @param[in] bundle the result bundle to set (can be null)
*/
void tt_app_set_result(AppHandle handle, AppResult result, BundleHandle bundle);
/** @return true if a result was set for this app context */
bool tt_app_has_result(AppHandle handle);
/** Get the path to the user data directory for this app.
* The app can store user-specific (mutable) data in there such as app settings.
* @param[in] handle the app handle
* @param[out] buffer the output buffer (recommended size is 256 bytes)
* @param[inout] size used as input for maximum buffer size (including null terminator) and is set with the path string length by this function
*/
void tt_app_get_user_data_path(AppHandle handle, char* buffer, size_t* size);
/** Resolve a child path in the user directory of this app.
* The app can store user-specific (mutable) data in there such as app settings.
* @param[in] handle the app handle
* @param[in] childPath the child path to resolve
* @param[out] buffer the output buffer (recommended size is 256 bytes)
* @param[inout] size used as input for maximum buffer size (including null terminator) and is set with the path string length by this function
*/
void tt_app_get_user_data_child_path(AppHandle handle, const char* childPath, char* buffer, size_t* size);
/** Get the path to the assets directory of this app.
* The content in this path should be treated as read-only.
* @param[in] handle the app handle
* @param[out] buffer the output buffer (recommended size is 256 bytes)
* @param[inout] size used as input for maximum buffer size (including null terminator) and is set with the path string length by this function
*/
void tt_app_get_assets_path(AppHandle handle, char* buffer, size_t* size);
/** Resolve a child path in the assets directory of this app.
* The content in this path should be treated as read-only.
* @param[in] handle the app handle
* @param[in] childPath the child path to resolve
* @param[out] buffer the output buffer (recommended size is 256 bytes)
* @param[inout] size used as input for maximum buffer size (including null terminator) and is set with the path string length by this function
*/
void tt_app_get_assets_child_path(AppHandle handle, const char* childPath, char* buffer, size_t* size);
/**
* Start an app by id.
* @param[in] appId the app manifest id
*/
void tt_app_start(const char* appId);
/** Stop the currently running app */
void tt_app_stop();
/**
* Start an app by id and bundle.
* @param[in] appId the app manifest id
* @param[in] parameters the parameters to pass onto the starting app
*/
void tt_app_start_with_bundle(const char* appId, BundleHandle parameters);
#ifdef __cplusplus
}
#endif