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a2ab0cde79
lvgl/lv_objx/lv_roller.c
Gabor Kiss-Vamosi d6739192fd add early return on LV_RES_INV in signal function
2017-11-07 17:00:55 +01:00

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/**
* @file lv_roller.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_conf.h"
#if USE_LV_ROLLER != 0
#include "lv_roller.h"
#include "../lv_draw/lv_draw.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static bool lv_roller_design(lv_obj_t * roller, const area_t * mask, lv_design_mode_t mode);
static lv_res_t lv_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param);
static lv_res_t lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * param);
static void refr_position(lv_obj_t *roller, bool anim_en);
static void draw_bg(lv_obj_t *roller, const area_t *mask);
/**********************
* STATIC VARIABLES
**********************/
static lv_signal_func_t ancestor_signal;
static lv_signal_func_t ancestor_scrl_signal;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/*-----------------
* Create function
*-----------------*/
/**
* Create a roller object
* @param par pointer to an object, it will be the parent of the new roller
* @param copy pointer to a roller object, if not NULL then the new object will be copied from it
* @return pointer to the created roller
*/
lv_obj_t * lv_roller_create(lv_obj_t * par, lv_obj_t * copy)
{
/*Create the ancestor of roller*/
lv_obj_t * new_roller = lv_ddlist_create(par, copy);
dm_assert(new_roller);
if(ancestor_scrl_signal == NULL) ancestor_scrl_signal = lv_obj_get_signal_func(lv_page_get_scrl(new_roller));
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_roller);
/*Allocate the roller type specific extended data*/
lv_roller_ext_t * ext = lv_obj_allocate_ext_attr(new_roller, sizeof(lv_roller_ext_t));
dm_assert(ext);
/*The signal and design functions are not copied so set them here*/
lv_obj_set_signal_func(new_roller, lv_roller_signal);
lv_obj_set_design_func(new_roller, lv_roller_design);
/*Init the new roller roller*/
if(copy == NULL) {
lv_obj_t * scrl = lv_page_get_scrl(new_roller);
lv_obj_set_drag(scrl, true); /*In ddlist is might be disabled*/
lv_page_set_release_action(new_roller, NULL); /*Roller don't uses it (like ddlist)*/
lv_page_set_scrl_fit(new_roller, true, false); /*Height is specified directly*/
lv_ddlist_open(new_roller, false);
lv_style_t * style_label = lv_obj_get_style(ext->ddlist.options_label);
lv_ddlist_set_fix_height(new_roller, (font_get_height(style_label->text.font) >> FONT_ANTIALIAS) * 3
+ style_label->text.line_space * 4);
lv_label_set_align(ext->ddlist.options_label, LV_LABEL_ALIGN_CENTER);
lv_obj_set_signal_func(scrl, lv_roller_scrl_signal);
lv_obj_refresh_style(new_roller); /*To set scrollable size automatically*/
}
/*Copy an existing roller*/
else {
lv_obj_t * scrl = lv_page_get_scrl(new_roller);
lv_ddlist_open(new_roller, false);
lv_obj_set_signal_func(scrl, lv_roller_scrl_signal);
lv_obj_refresh_style(new_roller); /*Refresh the style with new signal function*/
}
return new_roller;
}
/*======================
* Add/remove functions
*=====================*/
/*
* New object specific "add" or "remove" functions come here
*/
/*=====================
* Setter functions
*====================*/
/**
* Set the selected option
* @param roller pointer to a roller object
* @param sel_opt id of the selected option (0 ... number of option - 1);
* @param anim_en true: set with animation; false set immediately
*/
void lv_roller_set_selected(lv_obj_t *roller, uint16_t sel_opt, bool anim_en)
{
lv_ddlist_set_selected(roller, sel_opt);
refr_position(roller, anim_en);
}
/**
* Enable/disable to set the width of the roller manually (by lv_obj_Set_width())
* @param roller pointer to a roller object
* @param fit_en: true: enable auto size; false: use manual width settings
*/
void lv_roller_set_hor_fit(lv_obj_t *roller, bool fit_en)
{
lv_page_set_scrl_fit(roller, fit_en ,false);
lv_cont_set_fit(roller, fit_en ,false);
}
/*=====================
* Getter functions
*====================*/
/**
* Get the auto width set attribute
* @param roller pointer to a roller object
* @return true: auto size enabled; false: manual width settings enabled
*/
bool lv_roller_get_hor_fit(lv_obj_t *roller)
{
return lv_page_get_scrl_hor_fit(roller);
}
/*=====================
* Other functions
*====================*/
/*
* New object specific "other" functions come here
*/
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the rollers
* @param roller 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 true/false, depends on 'mode'
*/
static bool lv_roller_design(lv_obj_t * roller, const area_t * mask, lv_design_mode_t mode)
{
/*Return false if the object is not covers the mask_p area*/
if(mode == LV_DESIGN_COVER_CHK) {
return false;
}
/*Draw the object*/
else if(mode == LV_DESIGN_DRAW_MAIN) {
draw_bg(roller, mask);
lv_style_t *style = lv_ddlist_get_style_bg(roller);
const font_t * font = style->text.font;
lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS;
area_t rect_area;
rect_area.y1 = roller->coords.y1 + lv_obj_get_height(roller) / 2 - font_h / 2 - style->text.line_space / 2;
rect_area.y2 = rect_area.y1 + font_h + style->text.line_space;
rect_area.x1 = roller->coords.x1;
rect_area.x2 = roller->coords.x2;
lv_draw_rect(&rect_area, mask, ext->ddlist.selected_style);
}
/*Post draw when the children are drawn*/
else if(mode == LV_DESIGN_DRAW_POST) {
}
return true;
}
/**
* Signal function of the roller
* @param roller pointer to a roller 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_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_signal(roller, sign, param);
if(res != LV_RES_OK) return res;
lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
if(sign == LV_SIGNAL_STYLE_CHG) {
lv_obj_set_height(lv_page_get_scrl(roller),
lv_obj_get_height(ext->ddlist.options_label) + lv_obj_get_height(roller));
lv_obj_align(ext->ddlist.options_label, NULL, LV_ALIGN_CENTER, 0, 0);
lv_ddlist_set_selected(roller, ext->ddlist.selected_option_id);
refr_position(roller, false);
} else if(sign == LV_SIGNAL_CORD_CHG) {
if(lv_obj_get_width(roller) != area_get_width(param) ||
lv_obj_get_height(roller) != area_get_height(param)) {
lv_ddlist_set_fix_height(roller, lv_obj_get_height(roller));
lv_obj_set_height(lv_page_get_scrl(roller),
lv_obj_get_height(ext->ddlist.options_label) + lv_obj_get_height(roller));
lv_obj_align(ext->ddlist.options_label, NULL, LV_ALIGN_CENTER, 0, 0);
lv_ddlist_set_selected(roller, ext->ddlist.selected_option_id);
refr_position(roller, false);
}
}
return res;
}
/**
* Signal function of the scrollable part of the roller.
* @param roller_scrl ointer to the scrollable part of roller (page)
* @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_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_scrl_signal(roller_scrl, sign, param);
if(res != LV_RES_OK) return res;
lv_indev_t * indev = lv_indev_get_act();
int32_t id = -1;
lv_obj_t * roller = lv_obj_get_parent(roller_scrl);
lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
lv_style_t * style_label = lv_obj_get_style(ext->ddlist.options_label);
const font_t * font = style_label->text.font;
cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS;
if(sign == LV_SIGNAL_DRAG_END) {
/*If dragged then align the list to there be an element in the middle*/
cord_t label_y1 = ext->ddlist.options_label->coords.y1 - roller->coords.y1;
cord_t label_unit = font_h + style_label->text.line_space;
cord_t mid = (roller->coords.y2 - roller->coords.y1) / 2;
id = (mid - label_y1 + style_label->text.line_space / 2) / label_unit;
if(id < 0) id = 0;
if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
ext->ddlist.selected_option_id = id;
}
else if(sign == LV_SIGNAL_RELEASED) {
/*If picked an option by clicking then set it*/
if(!lv_indev_is_dragging(indev)) {
point_t p;
lv_indev_get_point(indev, &p);
p.y = p.y - ext->ddlist.options_label->coords.y1;
id = p.y / (font_h + style_label->text.line_space);
if(id < 0) id = 0;
if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
ext->ddlist.selected_option_id = id;
}
}
/*Position the scrollable according to the new selected option*/
if(id != -1) {
refr_position(roller, true);
}
return res;
}
/**
* Draw a rectangle which has gradient on its top and bottom
* @param roller pointer to a roller object
* @param mask pointer to the current mask (from the design function)
*/
static void draw_bg(lv_obj_t *roller, const area_t *mask)
{
lv_style_t *style = lv_ddlist_get_style_bg(roller);
area_t half_mask;
area_t half_roller;
cord_t h = lv_obj_get_height(roller);
bool union_ok;
area_cpy(&half_roller, &roller->coords);
half_roller.x1 -= roller->ext_size; /*Add ext size too (e.g. because of shadow draw) */
half_roller.x2 += roller->ext_size;
half_roller.y1 -= roller->ext_size;
half_roller.y2 = roller->coords.y1 + h / 2;
union_ok = area_union(&half_mask, &half_roller, mask);
half_roller.x1 += roller->ext_size; /*Revert ext. size adding*/
half_roller.x2 -= roller->ext_size;
half_roller.y1 += roller->ext_size;
half_roller.y2 += style->body.radius;
if(union_ok) {
lv_draw_rect(&half_roller, &half_mask, style);
}
half_roller.x1 -= roller->ext_size; /*Add ext size too (e.g. because of shadow draw) */
half_roller.x2 += roller->ext_size;
half_roller.y2 = roller->coords.y2 + roller->ext_size;
half_roller.y1 = roller->coords.y1 + h / 2;
if((h & 0x1) == 0) half_roller.y1++; /*With even height the pixels in the middle would be drawn twice*/
union_ok = area_union(&half_mask, &half_roller, mask);
half_roller.x1 += roller->ext_size; /*Revert ext. size adding*/
half_roller.x2 -= roller->ext_size;
half_roller.y2 -= roller->ext_size;
half_roller.y1 -= style->body.radius;
if(union_ok){
color_t main_tmp = style->body.color_main;
color_t grad_tmp = style->body.color_gradient;
style->body.color_main = grad_tmp;
style->body.color_gradient = main_tmp;
lv_draw_rect(&half_roller, &half_mask, style);
style->body.color_main = main_tmp;
style->body.color_gradient = grad_tmp;
}
}
/**
* Refresh the position of the roller. It uses the id stored in: ext->ddlist.selected_option_id
* @param roller pointer to a roller object
* @param anim_en true: refresh with animation; false: without animation
*/
static void refr_position(lv_obj_t *roller, bool anim_en)
{
lv_obj_t *roller_scrl = lv_page_get_scrl(roller);
lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
lv_style_t * style_label = lv_obj_get_style(ext->ddlist.options_label);
const font_t * font = style_label->text.font;
cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS;
cord_t h = lv_obj_get_height(roller);
int32_t id = ext->ddlist.selected_option_id;
cord_t line_y1 = id * (font_h + style_label->text.line_space) + ext->ddlist.options_label->coords.y1 - roller_scrl->coords.y1;
cord_t new_y = - line_y1 + (h - font_h) / 2;
if(ext->ddlist.anim_time == 0 || anim_en == false) {
lv_obj_set_y(roller_scrl, new_y);
} else {
anim_t a;
a.var = roller_scrl;
a.start = lv_obj_get_y(roller_scrl);
a.end = new_y;
a.fp = (anim_fp_t)lv_obj_set_y;
a.path = anim_get_path(ANIM_PATH_LIN);
a.end_cb = NULL;
a.act_time = 0;
a.time = ext->ddlist.anim_time;
a.playback = 0;
a.playback_pause = 0;
a.repeat = 0;
a.repeat_pause = 0;
anim_create(&a);
}
}
#endif
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