lv_obj_set_user_data i pass every parameters of my requested label to it, but when user_data ckecked inside the function is correct but outside of function when accesse using child = lv_obj_get_child(lv_scr_act(), i); user_strR = .
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0 · lv obj set user data
1 · base object lvgl
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I’m coding a screen transition program using ESP32 and ili9488. I had chat gpt create a sample program for simple screen transitions, but I cannot switch to the next screen .static inline void lv_obj_set_user_data (lv_obj_t * obj, void * user_data) ¶ Set .
lv obj set user data
static inline void lv_obj_set_user_data (lv_obj_t * obj, void * user_data) ¶ Set .
The code I have used so far with loads of warnings that works is as follows. .
static inline void lv_obj_set_user_data (lv_obj_t * obj, void * user_data) ¶ Set the user_data field of the object . Parameters. obj-- pointer to an object . user_data-- pointer to the new user_data. bool lv_obj_has_flag (const lv_obj_t * obj, . i pass every parameters of my requested label to it, but when user_data ckecked inside the function is correct but outside of function when accesse using child = lv_obj_get_child(lv_scr_act(), i); user_strR = . the data passing to “lv_obj_set_user_data” is printing correctly when 1st click but on 2nd click data not printing. for every area created with forloop printing correct data for first . Helps to quickly declare an event callback function. Will be expanded to: void (lv_obj_t * obj, lv_event_t e) Examples: static .
To make it simpler lv_msg_subsribe_obj(msg_id, obj, user_data) can be used. If a new message is published with msg_id an LV_EVENT_MSG_RECEIVED event will be sent to the .static inline void lv_obj_set_user_data (lv_obj_t * obj, void * user_data) ¶ Set the user_data field of the object . Parameters. obj-- pointer to an object . user_data-- pointer to the new . I don't think you can print/save/get the name of the screen, but maybe you can try to set a custom user_data to the screen e.g the name of the screen: . Learn how to pass user data to lv_obj_add_event_cb function in LVGL, a lightweight embedded graphics library. See examples, warnings, and solutions from forum .
Only a minor thing: let's pass obj to LV_USER_DATA_FREE instead of obj->user_data because it's easy to get user_data in the function too but obj might mean a useful context. So if @embeddedt also agrees, please .
In the example LV_EVENT_CLICKED means that only the click event will call my_event_cb.See the list of event codes for all the options. LV_EVENT_ALL can be used to receive all events.. The last parameter of lv_obj_add_event() is a pointer to any custom data that will be available in the event. NULL may be passed for this argument if there is no need to use that data when the . I wanted to reproduce it but don’t know when the screen_swith is called from the bar.. What is lv_obj_user_data_t in lv_conf.h? 文章浏览阅读4.1k次，点赞8次，收藏20次。博客介绍了如何在LVGL图形库中利用lv_obj_add_event_cb函数的user_data参数来优化事件处理。通过初始化静态变量、存储数据并传递其地址，可以为多个对象复用同一个事 .
void lv_table_set_cell_user_data (lv_obj_t * obj, uint16_t row, uint16_t col, void * user_data) ¶ Add custom user data to the cell. Parameters. obj-- pointer to a Table object . row-- id of the row [0 .. row_cnt -1] col-- id of the column [0 .. col_cnt -1] user_data-- pointer to the new user_data. It must be allocated by user as it will be .
Description. I wish to transition to LVGL v8. With versions v6 and v7 I made extensive use of the lv_obj_user_data_t typedef to add my own custom field to lv_obj_t.This has been removed in v8 and replaced with a fixed void * field, which forces me to use dynamic memory to attach custom data to objects. This would be fine if I could also specify how to free . Description Hi @kisvegabor and @embeddedt i am facing a small issue with “lv_obj_set_user_data” i have created custom list using area. when i click on each area i want to print particular data regarding that area. t. I agree with @embeddedt. array_device lives only in the for loop and its pointer will be invalid outside of the loop. .Parameters:. obj – pointer to an object . h – the new height . void lv_obj_set_content_width (lv_obj_t * obj, int32_t w) . Set the width reduced by the left and right padding and the border width. Parameters:. obj – pointer to an object . w – the width without paddings in pixels . void lv_obj_set_content_height (lv_obj_t * obj, int32_t h) . Set the height reduced by the top and .
base object lvgl
Instead I used lv_obj_set_user_data() to set the user data to the object and then lv_obj_get_user_data(object) to get the user data back. So the previous way it creates a new instance of the user data being assigned to the object while this one does not. More specifically, I think is the function used to get the object back.
Important: unclear posts may not receive useful answers. Before posting Get familiar with Markdown to format and structure your post Be sure to update lvgl from the latest version from the master branch. Be sure you ha. Description Hi @kisvegabor and @embeddedt i am facing a small issue with “lv_obj_set_user_data” i have created custom list using area. when i click on each area i want to print particular data regarding that area. t. i am getting below values from my db using curl and json. str_split1:Living room str_split2:9 str_split3:Switch str_split4 . Description Hi @kisvegabor and @embeddedt i am facing a small issue with “lv_obj_set_user_data” i have created custom list using area. when i click on each area i want to print particular data regarding that area. t. The code is quite complex, so it’s a bit difficult to decode, but your use of array_device looks suspicious. . Important: unclear posts may not receive useful answers. Before posting. Get familiar with Markdown to format and structure your post; Be sure to update lvgl from the latest version from the master branch.; Be sure you have checked the FAQ and read the relevant part of the documentation.; If applicable use the Simulator to eliminate hardware related issues. .
Perform all steps below and tick them with [x] [ x] Read the FAQ [ x] Check the related part of the Documentation [ x] Update lvgl to the latest version [ x] Reproduce the issue in a Simulator Describe the bug I want to use keyboard to a.static inline void lv_obj_set_user_data (lv_obj_t * obj, void * user_data) ¶ Set the user_data field of the object . Parameters. obj-- pointer to an object . user_data-- pointer to the new user_data. bool lv_obj_has_flag (const lv_obj_t * obj, lv_obj_flag_t f) ¶ Check if a given flag or all the given flags are set on an object. Parameters .user_data-- arbitrary data which will be available in cb too . Returns. pointer to a "subscribe object". It can be used the unsubscribe. void * lv_msg_subsribe_obj (uint32_t msg_id, lv_obj_t * obj, void * user_data) ¶ Subscribe an lv_obj to a message. LV_EVENT_MSG_RECEIVED will be triggered if a message with matching ID was sent . Parameters I use LittelvGL in mixed C/C++ projects. It would be really great if the event callbacks can have optional user data (void*) like the tasks. This way you can create the callback as a static function inside a class and pass the object pointer (this pointer) to the event so that you can access the class object inside the callback.
Hi @sjpw, I think you should probably declare the following as static or global so they are not destroyed when the stack is reclaimed. like so: static char text_strR[] = "My_GUI_test"; static char append_STR[] = "My_GUI_test DATA0000000"; static char append_STR1[] = "My_GUI_test DATA1111111"; static char append_STR2[] = "My_GUI_test .
Only a minor thing: let's pass obj to LV_USER_DATA_FREE instead of obj->user_data because it's easy to get user_data in the function too but obj might mean a useful context. So if @embeddedt also agrees, please send a PR. @amirgon could this custom "user data free" function be useful for Micropython? (btn's event_cb parametre obj gets a obj not btn). You see, other widget has more get_xxx function, if the event_cb function always gets obj, we can't get more info. So I want to use the case to change the parametre varible obj to other. If I use closure.just pass more parametre to pass the id and btn obj :
Or maybe add a a define like DONT_ZERO_USER_DATA_ON_OBJ_CREATION inside the lv_obj_create funcs and then I could just set the user data before calling lv_obj_create and it wouldn’t zero that field. I think it’s a good idea for the library in general as I saw that one of the required tasks was to do a C++ wrapper for LVGL. Without the above .You can apply multiple different animations on the same variable at the same time. For example, animate the x and y coordinates with lv_obj_set_x and lv_obj_set_y. However, only one animation can exist with a given variable and function pair. Therefore lv_anim_start() will delete the already existing variable-function animations.
Slider对象看起来像一个带有旋钮的工具条。可以拖动该旋钮来设置一个值。滑块也可以是垂直的或水平的。滑动条在前面我们介绍img控件的时候有个历程有使用到，哪里我们讲述设置样式实现对滑动条的一些样式的设置。
#include "../lv_examples.h" #if LV_BUILD_EXAMPLES && LV_USE_LABEL /** * Basic example to create a "Hello world" label */ void lv_example_get_started_1 (void . Description what to do do clean user data. What MCU/Processor/Board and compiler are you using? STM32H7 serie What LVGL version are you using? 7.8.1 DEV Question is it important to implement to free user data function ( i dont use it now ). What is the impact if i dont implement it ? How should i do it if needed it ? My custom data type is void* and i always .Speed vs time¶. By default, you set the animation time directly. But in some cases, setting the animation speed is more practical. The lv_anim_speed_to_time(speed, start, end) function calculates the required time in milliseconds to reach the end value from a start value with the given speed. The speed is interpreted in unit/sec dimension. For example, . Use lv_obj_set_user_data to store a reference to the LED object. You can then retrieve it in the event callback with lv_obj_get_user_data.
Thank you very much! Probably I’m over complicating it and thinking to C-ish, but the full scenario is to store arbitrary data (the a array in the example) in some objects and get them them later. In C I added an event handler and passed the pointer to the custom data as user_data.And with a custom event code, e.g. LV_EVENT_GET_MY_DATA I set it in the .
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lv_obj_set_user_data|base object lvgl
