Initial addition of asynchronous callbacks

lvgl.h

@@ -19,6 +19,7 @@ extern "C" {
 #include "src/lv_misc/lv_log.h"
 #include "src/lv_misc/lv_task.h"
 #include "src/lv_misc/lv_math.h"
+#include "src/lv_misc/lv_async.h"
 
 #include "src/lv_hal/lv_hal.h"
 

src/lv_core/lv_obj.c

@@ -15,6 +15,7 @@
 #include "../lv_draw/lv_draw.h"
 #include "../lv_misc/lv_anim.h"
 #include "../lv_misc/lv_task.h"
+#include "../lv_misc/lv_async.h"
 #include "../lv_misc/lv_fs.h"
 #include "../lv_hal/lv_hal.h"
 #include <stdint.h>
@@ -49,6 +50,7 @@ static void report_style_mod_core(void * style_p, lv_obj_t * obj);
 static void refresh_children_style(lv_obj_t * obj);
 static void delete_children(lv_obj_t * obj);
 static void lv_event_mark_deleted(lv_obj_t * obj);
+static void lv_obj_del_async_cb(void * obj);
 static bool lv_obj_design(lv_obj_t * obj, const lv_area_t * mask_p, lv_design_mode_t mode);
 static lv_res_t lv_obj_signal(lv_obj_t * obj, lv_signal_t sign, void * param);
 
@@ -448,6 +450,12 @@ lv_res_t lv_obj_del(lv_obj_t * obj)
     return LV_RES_INV;
 }
 
+
+void lv_obj_del_async(lv_obj_t * obj)
+{
+    lv_async_call(lv_obj_del_async_cb, obj);
+}
+
 /**
  * Delete all children of an object
  * @param obj pointer to an object
@@ -2101,6 +2109,11 @@ bool lv_obj_is_focused(const lv_obj_t * obj)
  *   STATIC FUNCTIONS
  **********************/
 
+static void lv_obj_del_async_cb(void * obj)
+{
+    lv_obj_del(obj);
+}
+
 /**
  * Handle the drawing related tasks of the base objects.
  * @param obj pointer to an object

src/lv_misc/lv_async.c

@@ -0,0 +1,75 @@
+/**
+ * @file lv_templ.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include "lv_async.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+static void lv_async_task_cb(lv_task_t *task);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+lv_res_t lv_async_call(lv_async_cb_t async_xcb, void * user_data)
+{
+    /*Allocate an info structure */
+    lv_async_info_t *info = lv_mem_alloc(sizeof(lv_async_info_t));
+    
+    if(info == NULL)
+        return LV_RES_INV;
+    
+    /* Create a new task */
+    /* Use highest priority so that it will run before a refresh */
+    lv_task_t *task = lv_task_create(lv_async_task_cb, 0, LV_TASK_PRIO_HIGHEST, info);
+    
+    if(task == NULL) {
+        lv_mem_free(info);
+        return LV_RES_INV;
+    }
+    
+    info->cb = async_xcb;
+    info->user_data = user_data;
+
+    /* Set the task's user data */
+    task->user_data = info;
+    lv_task_once(task);
+    return LV_RES_OK;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+static void lv_async_task_cb(lv_task_t *task)
+{
+    lv_async_info_t *info = (lv_async_info_t *)task->user_data;
+    
+    info->cb(info->user_data);
+    
+    lv_mem_free(info);
+}

src/lv_misc/lv_async.h

@@ -0,0 +1,73 @@
+/**
+ * @file lv_templ.h
+ *
+ */
+
+#ifndef LV_TEMPL_H
+#define LV_TEMPL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include "lv_task.h"
+#include "lv_types.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**
+ * Type for async callback.
+ */
+typedef void (*lv_async_cb_t)(void *);
+
+typedef struct _lv_async_info_t {
+    lv_async_cb_t cb;
+    void *user_data;
+} lv_async_info_t;
+
+struct _lv_obj_t;
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Call an asynchronous function the next time lv_task_handler() is run. This function is likely to return
+ * **before** the call actually happens!
+ * @param task_xcb a callback which is the task itself.
+ *                 (the 'x' in the argument name indicates that its not a fully generic function because it not follows
+ *                  the `func_name(object, callback, ...)` convention)
+ * @param user_data custom parameter
+ */
+lv_res_t lv_async_call(lv_async_cb_t async_xcb, void * user_data);
+
+/**
+ * Helper function for asynchronously deleting objects.
+ * 
+ * Useful for cases where you can't delete an object directly in an `LV_EVENT_DELETE` handler (i.e. parent).
+ * @param obj object to delete
+ * @see lv_async_call
+ */
+void lv_obj_del_async(struct _lv_obj_t *obj);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_TEMPL_H*/

src/lv_objx/lv_mbox.c

@@ -40,6 +40,7 @@ static void mbox_realign(lv_obj_t * mbox);
 static void lv_mbox_close_ready_cb(lv_anim_t * a);
 #endif
 static void lv_mbox_default_event_cb(lv_obj_t * mbox, lv_event_t event);
+static void lv_mbox_btnm_event_cb(lv_obj_t * btnm, lv_event_t event);
 
 /**********************
  *  STATIC VARIABLES
@@ -157,7 +158,7 @@ void lv_mbox_add_btns(lv_obj_t * mbox, const char ** btn_map)
 
     lv_btnm_set_map(ext->btnm, btn_map);
     lv_btnm_set_btn_ctrl_all(ext->btnm, LV_BTNM_CTRL_CLICK_TRIG | LV_BTNM_CTRL_NO_REPEAT);
-    lv_obj_set_parent_event(ext->btnm, true);
+    lv_obj_set_event_cb(ext->btnm, lv_mbox_btnm_event_cb);
 
     mbox_realign(mbox);
 }
@@ -529,4 +530,18 @@ static void lv_mbox_default_event_cb(lv_obj_t * mbox, lv_event_t event)
     lv_mbox_start_auto_close(mbox, 0);
 }
 
+static void lv_mbox_btnm_event_cb(lv_obj_t * btnm, lv_event_t event)
+{
+    lv_obj_t * mbox = lv_obj_get_parent(btnm);
+
+    /*clang-format off*/
+    if(event == LV_EVENT_PRESSED || event == LV_EVENT_PRESSING || event == LV_EVENT_PRESS_LOST ||
+       event == LV_EVENT_RELEASED || event == LV_EVENT_SHORT_CLICKED || event == LV_EVENT_CLICKED ||
+       event == LV_EVENT_LONG_PRESSED || event == LV_EVENT_LONG_PRESSED_REPEAT ||
+       event == LV_EVENT_VALUE_CHANGED) {
+        lv_event_send(mbox, event, lv_event_get_data());
+    }
+    /*clang-format on*/
+}
+
 #endif