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lv_roller: comments added

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This commit is contained in:
Kiss-Vamosi Gabor 2017-09-23 22:14:31 +02:00
parent b557331d63
commit af11110e0f
1 changed files with 13 additions and 9 deletions
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22
lv_objx/lv_roller.c
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@ -206,8 +206,14 @@ static bool lv_roller_design(lv_obj_t * roller, const area_t * mask, lv_design_m
return true; return true;
} }
/**
bool roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param) * 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 true: the object is still valid (not deleted), false: the object become invalid
*/
static bool roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param)
{ {
bool valid; bool valid;
@ -225,27 +231,25 @@ bool roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param)
const font_t * font = style_label->font; const font_t * font = style_label->font;
cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS; cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS;
/*If dragged then align the list to there be an element in the middle*/
if(lv_dispi_is_dragging(param)) { if(lv_dispi_is_dragging(param)) {
cord_t label_y1 = ext->ddlist.opt_label->cords.y1 - roller->cords.y1; cord_t label_y1 = ext->ddlist.opt_label->cords.y1 - roller->cords.y1;
cord_t label_unit = (font_get_height(style_label->font) >> FONT_ANTIALIAS) + style_label->line_space / 2; cord_t label_unit = (font_get_height(style_label->font) >> FONT_ANTIALIAS) + style_label->line_space / 2;
cord_t mid = (roller->cords.y2 - roller->cords.y1) / 2; cord_t mid = (roller->cords.y2 - roller->cords.y1) / 2;
id = (mid - label_y1) / label_unit; id = (mid - label_y1) / label_unit;
}
printf("roller diff: %d , unit: %d, id: %d\n", mid-label_y1, label_unit, id); /*If pick an option by clicking then set it*/
} else { else {
point_t p; point_t p;
lv_dispi_get_point(param, &p); lv_dispi_get_point(param, &p);
p.y = p.y - ext->ddlist.opt_label->cords.y1; p.y = p.y - ext->ddlist.opt_label->cords.y1;
printf("y: %d\n", p.y);
id = p.y / (font_h + style_label->line_space); id = p.y / (font_h + style_label->line_space);
} }
if(id < 0) id = 0; if(id < 0) id = 0;
if(id >= ext->ddlist.num_opt) id = ext->ddlist.num_opt - 1; if(id >= ext->ddlist.num_opt) id = ext->ddlist.num_opt - 1;
ext->ddlist.sel_opt = id; ext->ddlist.sel_opt = id;
/*Position the scrollable according to the new selected option*/
cord_t h = lv_obj_get_height(roller); cord_t h = lv_obj_get_height(roller);
cord_t line_y1 = id * (font_h + style_label->line_space) + ext->ddlist.opt_label->cords.y1 - roller_scrl->cords.y1; cord_t line_y1 = id * (font_h + style_label->line_space) + ext->ddlist.opt_label->cords.y1 - roller_scrl->cords.y1;
cord_t new_y = - line_y1 + (h - font_h) / 2; cord_t new_y = - line_y1 + (h - font_h) / 2;