247 lines
7.8 KiB
C
247 lines
7.8 KiB
C
/**
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* @file lv_dropdown.h
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*
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*/
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#ifndef LV_DROPDOWN_H
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#define LV_DROPDOWN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include "../lv_conf_internal.h"
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#if LV_USE_DROPDOWN != 0
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/*Testing of dependencies*/
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#if LV_USE_LABEL == 0
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#error "lv_dropdown: lv_label is required. Enable it in lv_conf.h (LV_USE_LABEL 1)"
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#endif
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#include "../widgets/lv_label.h"
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/*********************
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* DEFINES
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*********************/
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#define LV_DROPDOWN_POS_LAST 0xFFFF
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LV_EXPORT_CONST_INT(LV_DROPDOWN_POS_LAST);
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/**********************
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* TYPEDEFS
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**********************/
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typedef struct {
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lv_obj_t obj;
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lv_obj_t * list; /**< The dropped down list*/
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const char * text; /**< Text to display on the dropdown's button*/
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const void * symbol; /**< Arrow or other icon when the drop-down list is closed*/
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char * options; /**< Options in a '\n' separated list*/
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uint16_t option_cnt; /**< Number of options*/
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uint16_t sel_opt_id; /**< Index of the currently selected option*/
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uint16_t sel_opt_id_orig; /**< Store the original index on focus*/
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uint16_t pr_opt_id; /**< Index of the currently pressed option*/
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lv_dir_t dir : 4; /**< Direction in which the list should open*/
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uint8_t static_txt : 1; /**< 1: Only a pointer is saved in `options`*/
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uint8_t selected_highlight: 1; /**< 1: Make the selected option highlighted in the list*/
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} lv_dropdown_t;
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typedef struct {
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lv_obj_t obj;
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lv_obj_t * dropdown;
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} lv_dropdown_list_t;
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extern const lv_obj_class_t lv_dropdown_class;
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extern const lv_obj_class_t lv_dropdownlist_class;
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Create a drop-down list object
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* @param parent pointer to an object, it will be the parent of the new drop-down list
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* @return pointer to the created drop-down list
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*/
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lv_obj_t * lv_dropdown_create(lv_obj_t * parent);
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/*=====================
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* Setter functions
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*====================*/
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/**
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* Set text of the drop-down list's button.
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* If set to `NULL` the selected option's text will be displayed on the button.
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* If set to a specific text then that text will be shown regardless of the selected option.
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* @param obj pointer to a drop-down list object
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* @param txt the text as a string (Only its pointer is saved)
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*/
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void lv_dropdown_set_text(lv_obj_t * obj, const char * txt);
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/**
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* Set the options in a drop-down list from a string.
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* The options will be copied and saved in the object so the `options` can be destroyed after calling this function
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* @param obj pointer to drop-down list object
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* @param options a string with '\n' separated options. E.g. "One\nTwo\nThree"
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*/
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void lv_dropdown_set_options(lv_obj_t * obj, const char * options);
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/**
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* Set the options in a drop-down list from a static string (global, static or dynamically allocated).
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* Only the pointer of the option string will be saved.
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* @param obj pointer to drop-down list object
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* @param options a static string with '\n' separated options. E.g. "One\nTwo\nThree"
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*/
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void lv_dropdown_set_options_static(lv_obj_t * obj, const char * options);
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/**
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* Add an options to a drop-down list from a string. Only works for non-static options.
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* @param obj pointer to drop-down list object
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* @param option a string without '\n'. E.g. "Four"
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* @param pos the insert position, indexed from 0, LV_DROPDOWN_POS_LAST = end of string
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*/
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void lv_dropdown_add_option(lv_obj_t * obj, const char * option, uint32_t pos);
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/**
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* Clear all options in a drop-down list. Works with both static and dynamic options.
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* @param obj pointer to drop-down list object
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*/
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void lv_dropdown_clear_options(lv_obj_t * obj);
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/**
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* Set the selected option
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* @param obj pointer to drop-down list object
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* @param sel_opt id of the selected option (0 ... number of option - 1);
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*/
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void lv_dropdown_set_selected(lv_obj_t * obj, uint16_t sel_opt);
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/**
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* Set the direction of the a drop-down list
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* @param obj pointer to a drop-down list object
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* @param dir LV_DIR_LEFT/RIGHT/TOP/BOTTOM
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*/
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void lv_dropdown_set_dir(lv_obj_t * obj, lv_dir_t dir);
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/**
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* Set an arrow or other symbol to display when on drop-down list's button. Typically a down caret or arrow.
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* @param obj pointer to drop-down list object
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* @param symbol a text like `LV_SYMBOL_DOWN`, an image (pointer or path) or NULL to not draw symbol icon
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* @note angle and zoom transformation can be applied if the symbol is an image.
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* E.g. when drop down is checked (opened) rotate the symbol by 180 degree
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*/
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void lv_dropdown_set_symbol(lv_obj_t * obj, const void * symbol);
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/**
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* Set whether the selected option in the list should be highlighted or not
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* @param obj pointer to drop-down list object
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* @param en true: highlight enabled; false: disabled
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*/
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void lv_dropdown_set_selected_highlight(lv_obj_t * obj, bool en);
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/*=====================
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* Getter functions
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*====================*/
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/**
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* Get the list of a drop-down to allow styling or other modifications
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* @param obj pointer to a drop-down list object
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* @return pointer to the list of the drop-down
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*/
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lv_obj_t * lv_dropdown_get_list(lv_obj_t * obj);
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/**
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* Get text of the drop-down list's button.
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* @param obj pointer to a drop-down list object
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* @return the text as string, `NULL` if no text
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*/
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const char * lv_dropdown_get_text(lv_obj_t * obj);
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/**
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* Get the options of a drop-down list
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* @param obj pointer to drop-down list object
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* @return the options separated by '\n'-s (E.g. "Option1\nOption2\nOption3")
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*/
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const char * lv_dropdown_get_options(const lv_obj_t * obj);
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/**
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* Get the index of the selected option
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* @param obj pointer to drop-down list object
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* @return index of the selected option (0 ... number of option - 1);
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*/
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uint16_t lv_dropdown_get_selected(const lv_obj_t * obj);
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/**
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* Get the total number of options
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* @param obj pointer to drop-down list object
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* @return the total number of options in the list
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*/
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uint16_t lv_dropdown_get_option_cnt(const lv_obj_t * obj);
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/**
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* Get the current selected option as a string
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* @param obj pointer to drop-down object
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* @param buf pointer to an array to store the string
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* @param buf_size size of `buf` in bytes. 0: to ignore it.
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*/
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void lv_dropdown_get_selected_str(const lv_obj_t * obj, char * buf, uint32_t buf_size);
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/**
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* Get the symbol on the drop-down list. Typically a down caret or arrow.
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* @param obj pointer to drop-down list object
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* @return the symbol or NULL if not enabled
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*/
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const char * lv_dropdown_get_symbol(lv_obj_t * obj);
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/**
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* Get whether the selected option in the list should be highlighted or not
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* @param obj pointer to drop-down list object
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* @return true: highlight enabled; false: disabled
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*/
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bool lv_dropdown_get_selected_highlight(lv_obj_t * obj);
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/**
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* Get the direction of the drop-down list
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* @param obj pointer to a drop-down list object
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* @return LV_DIR_LEF/RIGHT/TOP/BOTTOM
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*/
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lv_dir_t lv_dropdown_get_dir(const lv_obj_t * obj);
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/*=====================
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* Other functions
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*====================*/
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/**
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* Open the drop.down list
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* @param obj pointer to drop-down list object
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*/
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void lv_dropdown_open(lv_obj_t * dropdown_obj);
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/**
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* Close (Collapse) the drop-down list
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* @param obj pointer to drop-down list object
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*/
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void lv_dropdown_close(lv_obj_t * obj);
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/**
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* Tells whether the list is opened or not
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* @param obj pointer to a drop-down list object
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* @return true if the list os opened
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*/
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bool lv_dropdown_is_open(lv_obj_t * obj);
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/**********************
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* MACROS
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**********************/
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#endif /*LV_USE_DROPDOWN*/
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#ifdef __cplusplus
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} /*extern "C"*/
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#endif
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#endif /*LV_DROPDOWN_H*/
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