说明

lvgl版本7.11。

1.模板文件

先从lvgl\src\lv_widgets\lv_objx_templ.c复制出lv_objx_templ.c和lv_objx_templ.h,重命名为你需要创建的组件名称例如lv_objxscrol.c和lv_objxscrol.h。

2.修改文件

根据提示我们将对应的temp字段替换成我们自己的组件名称。

2.1全局替换成下面这样

3.包含头文件

3.1如下

4.去掉defined() &&

5.在文件lvgl\lvgl.h中添加头文件

6.在文件lv_conf.h中添加#define LV_USE_OBJSCROL 1开启组件功能

7.添加源文件

目录

gui\lvgl\CMakeLists.txt

编译问题记录

问题1

先注释掉，后面用到再改。

问题2

注释掉，没有用。

问题3

参数不对，注释掉

问题4

找到对应函数

改成

因为我是打算在创建的页上做扩展。

问题5

找到对应函数

改成

因为在这个版本里是对应的是这个宏。

例 自定义组件lv_scale

需要在配置文件中启用LV_USE_SCALE 宏定义

/**
 * @file lv_scale.c
 *
 */

/*********************
 *      INCLUDES
 *********************/
#include "../lv_misc/lv_debug.h"
#include "lv_scale.h"

#if  LV_USE_SCALE != 0

/*********************
 *      DEFINES
 *********************/
#define LV_OBJX_NAME "lv_scale"

/**********************
 *      TYPEDEFS
 **********************/

/**********************
 *  STATIC PROTOTYPES
 **********************/
static lv_design_res_t lv_scale_design(lv_obj_t * scale, const lv_area_t * clip_area, lv_design_mode_t mode);
static lv_res_t lv_scale_signal(lv_obj_t * scale, lv_signal_t sign, void * param);

/**********************
 *  STATIC VARIABLES
 **********************/
static lv_signal_cb_t ancestor_signal;
static lv_design_cb_t ancestor_design;

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

/**
 * Create a scalemenu object
 * @param par pointer to an object, it will be the parent of the new scalemenu
 * @param copy pointer to a scalemenu object, if not NULL then the new object will be copied from it
 * @return pointer to the created scalemenu
 */
lv_obj_t * lv_scale_create(lv_obj_t * par, const lv_obj_t * copy)
{
    LV_LOG_TRACE("scalemenu create started");

    /*Create the ancestor of scalemenu*/
    /*TODO modify it to the ancestor create function */
    lv_obj_t * new_scale = lv_cont_create(par, copy);
    LV_ASSERT_MEM(new_scale);
    if(new_scale == NULL) return NULL;

    /*Allocate the scalemenu type specific extended data*/
    lv_scale_ext_t * ext = lv_obj_allocate_ext_attr(new_scale, sizeof(lv_scale_ext_t));
    lv_mem_assert(ext);
    if(ext == NULL) {
        lv_obj_del(new_scale);
        return NULL;
    }

    if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_cb(new_scale);
    if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_cb(new_scale);

    /*Initialize the allocated 'ext' */


    /*The signal and design functions are not copied so set them here*/
    lv_obj_set_signal_cb(new_scale, lv_scale_signal);
    lv_obj_set_design_cb(new_scale, lv_scale_design);

    /*Init the new scalemenu scalemenu*/
    if(copy == NULL) {

    }
    /*Copy an existing scalemenu*/
    else {
        lv_scale_ext_t * copy_ext = lv_obj_get_ext_attr(copy);

        /*Refresh the style with new signal function*/

    }

    LV_LOG_INFO("scalemenu created");

    return new_scale;
}

/*======================
 * Add/remove functions
 *=====================*/

/*
 * New object specific "add" or "remove" functions come here
 */

/*=====================
 * Setter functions
 *====================*/

/*
 * New object specific "set" functions come here
 */

/**
 * Set a style of a scalemenu.
 * @param scale pointer to scalemenu object
 * @param type which style should be set
 * @param style pointer to a style
 */
void lv_scale_set_style(lv_obj_t * scale, lv_scale_style_t type, const lv_style_t * style)
{
    LV_ASSERT_OBJ(scale, LV_OBJX_NAME);

    lv_scale_ext_t * ext = lv_obj_get_ext_attr(scale);

    switch(type) {
        case LV_SCALE_STYLE_X:
            break;
        case LV_SCALE_STYLE_Y:
            break;
    }
}

/*=====================
 * Getter functions
 *====================*/

/*
 * New object specific "get" functions come here
 */

/**
 * Get style of a scalemenu.
 * @param scale pointer to scalemenu object
 * @param type which style should be get
 * @return style pointer to the style
 */
lv_style_t * lv_scale_get_style(const lv_obj_t * scale, lv_scale_style_t type)
{
    LV_ASSERT_OBJ(scale, LV_OBJX_NAME);

    lv_scale_ext_t * ext = lv_obj_get_ext_attr(scale);
    lv_style_t * style   = NULL;

    switch(type) {
        case LV_SCALE_STYLE_X:
            style = NULL; /*Replace NULL with a pointer to the style*/
        case LV_SCALE_STYLE_Y:
            style = NULL; /*Replace NULL with a pointer to the style*/
        default:
            style = NULL;
    }

    return style;
}

/*=====================
 * Other functions
 *====================*/

/*
 * New object specific "other" functions come here
 */

/**********************
 *   STATIC FUNCTIONS
 **********************/

/**
 * Handle the drawing related tasks of the scalemenus
 * @param scale pointer to an object
 * @param mask the object will be drawn only in this area
 * @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
 *                                  (return 'true' if yes)
 *             LV_DESIGN_DRAW: draw the object (always return 'true')
 *             LV_DESIGN_DRAW_POST: drawing after every children are drawn
 * @param return an element of `lv_design_res_t`
 */
static lv_design_res_t lv_scale_design(lv_obj_t * scale, const lv_area_t * clip_area, lv_design_mode_t mode)
{
    /*Return false if the object is not covers the mask_p area*/
    if(mode == LV_DESIGN_COVER_CHK) {
        return LV_DESIGN_RES_NOT_COVER;
    }
    /*Draw the object*/
    else if(mode == LV_DESIGN_DRAW_MAIN) {

    }
    /*Post draw when the children are drawn*/
    else if(mode == LV_DESIGN_DRAW_POST) {
    }

    return LV_DESIGN_RES_OK;
}

/**
 * Signal function of the scalemenu
 * @param scale pointer to a scalemenu object
 * @param sign a signal type from lv_signal_t enum
 * @param param pointer to a signal specific variable
 * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
 */
static lv_res_t lv_scale_signal(lv_obj_t * scale, lv_signal_t sign, void * param)
{
    lv_res_t res;

    /* Include the ancient signal function */
    res = ancestor_signal(scale, sign, param);
    if(res != LV_RES_OK) return res;
    if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);

    if(sign == LV_SIGNAL_CLEANUP) {
        /*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
    }

    return res;
}

#else /* Enable this file at the top */

/* This dummy typedef exists purely to silence -Wpedantic. */
typedef int keep_pedantic_happy;
#endif

/**
 * @file lv_scale.h
 *
 */

#ifndef LV_SCALE_H
#define LV_SCALE_H

#ifdef __cplusplus
extern "C" {
#endif

/*********************
 *      INCLUDES
 *********************/
#include "../lv_conf_internal.h"

#if LV_USE_SCALE != 0

#include "../lv_core/lv_obj.h"

/*********************
 *      DEFINES
 *********************/

/**********************
 *      TYPEDEFS
 **********************/
/*Data of scalemenu*/
typedef struct {
    // lv_ANCESTOR_ext_t ANCESTOR; /*Ext. of ancestor*/
    /*New data for this type */
} lv_scale_ext_t;

/*Styles*/
enum {
    LV_SCALE_STYLE_X,
    LV_SCALE_STYLE_Y,
};
typedef uint8_t lv_scale_style_t;

/**********************
 * GLOBAL PROTOTYPES
 **********************/

/**
 * Create a scalemenu objects
 * @param par pointer to an object, it will be the parent of the new scalemenu
 * @param copy pointer to a scalemenu object, if not NULL then the new object will be copied from it
 * @return pointer to the created scalemenu
 */
lv_obj_t * lv_scale_create(lv_obj_t * par, const lv_obj_t * copy);

/*======================
 * Add/remove functions
 *=====================*/

/*=====================
 * Setter functions
 *====================*/

/**
 * Set a style of a scalemenu.
 * @param scale pointer to scalemenu object
 * @param type which style should be set
 * @param style pointer to a style
 */
void lv_scale_set_style(lv_obj_t * scale, lv_scale_style_t type, const lv_style_t * style);

/*=====================
 * Getter functions
 *====================*/

/**
 * Get style of a scalemenu.
 * @param scale pointer to scalemenu object
 * @param type which style should be get
 * @return style pointer to the style
 */
lv_style_t * lv_scale_get_style(const lv_obj_t * scale, lv_scale_style_t type);

/*=====================
 * Other functions
 *====================*/

/**********************
 *      MACROS
 **********************/

#endif /*LV_USE_SCALE*/

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /*LV_SCALE_H*/