/**
* Get a style of a roller
* @param roller pointer to a roller object
* @param type which style should be get
* @return style pointer to a style
* */
lv_style_t * lv_roller_get_style(lv_obj_t *roller, lv_roller_style_t type)
{
switch (type) {
case LV_ROLLER_STYLE_BG: return lv_obj_get_style(roller);
case LV_ROLLER_STYLE_SEL: return lv_ddlist_get_style(roller, LV_DDLIST_STYLE_SEL);
default: return NULL;
}
/*To avoid warning*/
return NULL;
}
/**
* Signal function of the drop down list's scrollable part
* @param scrl pointer to a drop down list's scrollable part
* @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_ddlist_scrl_signal(lv_obj_t * scrl, lv_signal_t sign, void * param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_scrl_signal(scrl, sign, param);
if(res != LV_RES_OK) return res;
lv_obj_t *ddlist = lv_obj_get_parent(scrl);
if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
/* Because of the wider selected rectangle ext. size
* In this way by dragging the scrollable part the wider rectangle area can be redrawn too*/
lv_style_t *style = lv_ddlist_get_style(ddlist, LV_DDLIST_STYLE_BG);
if(scrl->ext_size < style->body.padding.hor) scrl->ext_size = style->body.padding.hor;
}
else if(sign == LV_SIGNAL_CLEANUP) {
lv_ddlist_ext_t *ext = lv_obj_get_ext_attr(ddlist);
ext->label = NULL; /*The label is already deleted*/
}
return res;
}
/**
* Handle the drawing related tasks of the drop down lists
* @param ddlist 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_ddlist_design(lv_obj_t * ddlist, const lv_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 ancestor_design(ddlist, mask, mode);
}
/*Draw the object*/
else if(mode == LV_DESIGN_DRAW_MAIN) {
ancestor_design(ddlist, mask, mode);
lv_ddlist_ext_t * ext = lv_obj_get_ext_attr(ddlist);
/*If the list is opened draw a rectangle under the selected item*/
if(ext->opened != 0) {
lv_style_t *style = lv_ddlist_get_style(ddlist, LV_DDLIST_STYLE_BG);
const lv_font_t * font = style->text.font;
lv_coord_t font_h = lv_font_get_height(font);
/*Draw the selected*/
lv_area_t rect_area;
rect_area.y1 = ext->label->coords.y1;
rect_area.y1 += ext->sel_opt_id * (font_h + style->text.line_space);
rect_area.y1 -= style->text.line_space / 2;
rect_area.y2 = rect_area.y1 + font_h + style->text.line_space;
rect_area.x1 = ddlist->coords.x1;
rect_area.x2 = ddlist->coords.x2;
lv_draw_rect(&rect_area, mask, ext->sel_style);
}
}
/*Post draw when the children are drawn*/
else if(mode == LV_DESIGN_DRAW_POST) {
ancestor_design(ddlist, mask, mode);
/*Redraw the text on the selected area with a different color*/
lv_ddlist_ext_t * ext = lv_obj_get_ext_attr(ddlist);
/*Redraw only in opened state*/
if(ext->opened == 0) return true;
lv_style_t *style = lv_ddlist_get_style(ddlist, LV_DDLIST_STYLE_BG);
const lv_font_t * font = style->text.font;
lv_coord_t font_h = lv_font_get_height(font);
lv_area_t area_sel;
area_sel.y1 = ext->label->coords.y1;
area_sel.y1 += ext->sel_opt_id * (font_h + style->text.line_space);
area_sel.y1 -= style->text.line_space / 2;
area_sel.y2 = area_sel.y1 + font_h + style->text.line_space;
area_sel.x1 = ddlist->coords.x1;
area_sel.x2 = ddlist->coords.x2;
lv_area_t mask_sel;
bool area_ok;
area_ok = lv_area_union(&mask_sel, mask, &area_sel);
if(area_ok) {
lv_style_t *sel_style = lv_ddlist_get_style(ddlist, LV_DDLIST_STYLE_SEL);
lv_style_t new_style;
lv_style_copy(&new_style, style);
new_style.text.color = sel_style->text.color;
new_style.text.opa = sel_style->text.opa;
lv_draw_label(&ext->label->coords, &mask_sel, &new_style,
lv_label_get_text(ext->label), LV_TXT_FLAG_NONE, NULL);
}
}
return true;
}
