/**
 * @file lv_page.h
 * 
 */

#ifndef LV_PAGE_H
#define LV_PAGE_H

#ifdef __cplusplus
extern "C" {
#endif

/*********************
 *      INCLUDES
 *********************/
#include "lv_conf.h"
#if USE_LV_PAGE != 0

/*Testing of dependencies*/
#if USE_LV_CONT == 0
#error "lv_page: lv_cont is required. Enable it in lv_conf.h (USE_LV_CONT  1) "
#endif

#include "../lv_obj/lv_obj.h"
#include "lvgl/lv_objx/lv_cont.h"
#include "../lv_obj/lv_dispi.h"

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

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

/*Scrollbar modes: shows when should the scrollbars be visible*/
typedef enum
{
    LV_PAGE_SB_MODE_OFF,    /*Never show scrollbars*/
    LV_PAGE_SB_MODE_ON,     /*Always show scrollbars*/
    LV_PAGE_SB_MODE_DRAG,   /*Show scrollbars when page is being dragged*/
    LV_PAGE_SB_MODE_AUTO,   /*Show scrollbars when the scrollable container is large enough to be scrolled*/
}lv_page_sb_mode_t;

/*Data of page*/
typedef struct
{
    lv_cont_ext_t bg; /*Ext. of ancestor*/
    /*New data for this type */
    lv_obj_t * scrl;            /*The scrollable object on the background*/
    lv_action_t rel_action;     /*Function to call when the page is released*/
    lv_action_t pr_action;      /*Function to call when the page is pressed*/
    lv_style_t * style_sb;      /*Style of scrollbars*/
    cord_t sb_width;            /*Width of the scrollbars*/
    lv_page_sb_mode_t sb_mode;  /*Scrollbar visibility from 'lv_page_sb_mode_t'*/
    area_t sbh;                 /*Horizontal scrollbar area relative to the page. (Handled by the library) */
    area_t sbv;                 /*Vertical scrollbar area relative to the page (Handled by the library)*/
    uint8_t sbh_draw :1;        /*1: horizontal scrollbar is visible now (Handled by the library)*/
    uint8_t sbv_draw :1;        /*1: vertical scrollbar is visible now (Handled by the library)*/
}lv_page_ext_t;


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

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

/**
 * Signal function of the page
 * @param page pointer to a page object
 * @param sign a signal type from lv_signal_t enum
 * @param param pointer to a signal specific variable
 */
bool lv_page_signal(lv_obj_t * page, lv_signal_t sign, void * param);

/**
 * Set a release action for the page
 * @param page pointer to a page object
 * @param rel_action a function to call when the page is released
 */
void lv_page_set_rel_action(lv_obj_t * page, lv_action_t rel_action);

/**
 * Set a press action for the page
 * @param page pointer to a page object
 * @param pr_action a function to call when the page is pressed
 */
void lv_page_set_pr_action(lv_obj_t * page, lv_action_t pr_action);

/**
 * Set the scroll bar width on a page
 * @param page pointer to a page object
 * @param sb_width the new scroll bar width in pixels
 */
void lv_page_set_sb_width(lv_obj_t * page, cord_t sb_width);

/**
 * Set the scroll bar mode on a page
 * @param page pointer to a page object
 * @param sb_mode the new mode from 'lv_page_sb_mode_t' enum
 */
void lv_page_set_sb_mode(lv_obj_t * page, lv_page_sb_mode_t sb_mode);

/**
 * Set a new style for the scroll bars object on the page
 * @param page pointer to a page object
 * @param style pointer to a style for the scroll bars
 */
void lv_page_set_style_sb(lv_obj_t * page, lv_style_t * style);

/**
 * Glue the object to the page. After it the page can be moved (dragged) with this object too.
 * @param obj pointer to an object on a page
 * @param glue true: enable glue, false: disable glue
 */
void lv_page_glue_obj(lv_obj_t * obj, bool glue);

/**
 * Focus on an object. It ensures that the object will be visible on the page.
 * @param page pointer to a page object
 * @param obj pointer to an object to focus (must be on the page)
 * @param anim_time scroll animation time in milliseconds (0: no animation)
 */
void lv_page_focus(lv_obj_t * page, lv_obj_t * obj, uint16_t anim_time);

/**
 * Get the scrollable object of a page-
 * @param page pointer to page object
 * @return pointer to a container which is the scrollable part of the page
 */
lv_obj_t * lv_page_get_scrl(lv_obj_t * page);

/**
 * Get the scroll bar width on a page
 * @param page pointer to a page object
 * @return the scroll bar width in pixels
 */
cord_t lv_page_get_sb_width(lv_obj_t * page);

/**
 * Set the scroll bar mode on a page
 * @param page pointer to a page object
 * @return the mode from 'lv_page_sb_mode_t' enum
 */
lv_page_sb_mode_t lv_page_get_sb_mode(lv_obj_t * page);

/**
 * Set a new style for the scroll bars object on the page
 * @param page pointer to a page object
 * @return pointer to a style for the scroll bars
 */
lv_style_t * lv_page_get_style_sb(lv_obj_t * page);

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

#endif  /*USE_LV_PAGE*/

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

#endif  /*LV_PAGE_H*/