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CTCaer
GitHub Repository: CTCaer/hekate
 Path: blob/master/bdk/libs/lvgl/lv_themes/lv_theme.c
1476 views
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/**

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 * @file lv_theme.c

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 *

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 */

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/*********************

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 *      INCLUDES

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 *********************/

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#include "lv_theme.h"

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

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/*********************

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 *      DEFINES

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 *********************/

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/**********************

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 *      TYPEDEFS

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 **********************/

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/**********************

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 *  STATIC PROTOTYPES

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 **********************/

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/**********************

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 *  STATIC VARIABLES

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 **********************/

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#if LV_THEME_LIVE_UPDATE == 0

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static lv_theme_t * current_theme;

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#else

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/* If live update is used then a big `lv_style_t` array is used to store the real styles of the theme not only pointers.

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 * On `lv_theme_set_current` the styles of the theme are copied to this array.

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 * The pointers in `current_theme` are initialized to point to the styles in the array.

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 * This way the theme styles will always point to the same memory address even after theme is change.

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 * (The pointers in the theme points to the styles declared by the theme itself) */

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/* Store the styles in this array.

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 * Can't determine the size in compile time because sizeof is not evaluated (should be `sizeof(lv_theme_t) / sizeof(lv_style_t*)`).

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 * Error will be generated in run time if too small.*/

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static lv_style_t th_styles[120];

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static bool inited = false;

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static lv_theme_t current_theme;

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#endif

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/**********************

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 *      MACROS

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 **********************/

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/**********************

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 *   GLOBAL FUNCTIONS

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 **********************/

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/**

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 * Set a theme for the system.

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 * From now, all the created objects will use styles from this theme by default

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 * @param th pointer to theme (return value of: 'lv_theme_init_xxx()')

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 */

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void lv_theme_set_current(lv_theme_t * th)

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{

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#if LV_THEME_LIVE_UPDATE == 0

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    current_theme = th;

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#else

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    uint32_t style_num = sizeof(lv_theme_t) / sizeof(lv_style_t *);     /*Number of styles in a theme*/

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    if(!inited) {

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        /*It's not sure `th_styles` is big enough. Check it now!*/

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        if(style_num > sizeof(th_styles) / sizeof(lv_style_t)) {

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            LV_LOG_ERROR("Themes: th_styles array is too small. Increase it's size!");

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            while(1);

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        }

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        /*Initialize the style pointers `current_theme` to point to the `th_styles` style array */

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        uint16_t i;

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        lv_style_t ** cur_th_style_p = (lv_style_t **) &current_theme;

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        for(i = 0; i < style_num; i++) {

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            uintptr_t adr = (uintptr_t)&th_styles[i];

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            memcpy(&cur_th_style_p[i], &adr, sizeof(lv_style_t *));

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        }

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        inited = true;

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    }

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    /*Copy the styles pointed by the new theme to the `th_styles` style array*/

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    uint16_t i;

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    lv_style_t ** th_style = (lv_style_t **) th;

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    for(i = 0; i < style_num; i++) {

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        uintptr_t s = (uintptr_t)th_style[i];

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        if(s) memcpy(&th_styles[i], (void *)s, sizeof(lv_style_t));

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    }

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    /*Let the object know their style might change*/

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    lv_obj_report_style_mod(NULL);

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#endif

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}

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/**

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 * Get the current system theme.

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 * @return pointer to the current system theme. NULL if not set.

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 */

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lv_theme_t * lv_theme_get_current(void)

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{

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#if LV_THEME_LIVE_UPDATE == 0

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    return current_theme;

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#else

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    if(!inited) return NULL;

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    else return &current_theme;

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#endif

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}

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/**********************

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 *   STATIC FUNCTIONS

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 **********************/

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