49     if(indev->pointer.vect.x == 0 && indev->pointer.vect.y == 0) {  in lv_indev_scroll_handler()
54     /*If there is no scroll object yet try to find one*/  in lv_indev_scroll_handler()
55     if(scroll_obj == NULL) {  in lv_indev_scroll_handler()
57         if(scroll_obj == NULL) return;  in lv_indev_scroll_handler()
63         if(indev->reset_query) return;  in lv_indev_scroll_handler()
66     /*Set new position or scroll if the vector is not zero*/  in lv_indev_scroll_handler()
80     if(scale_x == 0) {  in lv_indev_scroll_handler()
84     if(scale_y == 0) {  in lv_indev_scroll_handler()
88     if(angle != 0 || scale_x != LV_SCALE_NONE || scale_y != LV_SCALE_NONE) {  in lv_indev_scroll_handler()
98     if(indev->pointer.scroll_dir == LV_DIR_HOR) {  in lv_indev_scroll_handler()
110     if((scroll_dir & LV_DIR_LEFT)   == 0 && diff_x > 0) diff_x = 0;  in lv_indev_scroll_handler()
111     if((scroll_dir & LV_DIR_RIGHT)  == 0 && diff_x < 0) diff_x = 0;  in lv_indev_scroll_handler()
112     if((scroll_dir & LV_DIR_TOP)    == 0 && diff_y > 0) diff_y = 0;  in lv_indev_scroll_handler()
113     if((scroll_dir & LV_DIR_BOTTOM) == 0 && diff_y < 0) diff_y = 0;  in lv_indev_scroll_handler()
119     if(indev->reset_query) return;  in lv_indev_scroll_handler()
127     if(scroll_obj == NULL) return;  in lv_indev_scroll_throw_handler()
128     if(indev->pointer.scroll_dir == LV_DIR_NONE) return;  in lv_indev_scroll_throw_handler()
132     if(lv_obj_has_flag(scroll_obj, LV_OBJ_FLAG_SCROLL_MOMENTUM) == false) {  in lv_indev_scroll_throw_handler()
140     if(indev->pointer.scroll_dir == LV_DIR_VER) {  in lv_indev_scroll_throw_handler()
142         /*If no snapping "throw"*/  in lv_indev_scroll_throw_handler()
143         if(align_y == LV_SCROLL_SNAP_NONE) {  in lv_indev_scroll_throw_handler()
154             if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
163             if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
166     else if(indev->pointer.scroll_dir == LV_DIR_HOR) {  in lv_indev_scroll_throw_handler()
168         /*If no snapping "throw"*/  in lv_indev_scroll_throw_handler()
169         if(align_x == LV_SCROLL_SNAP_NONE) {  in lv_indev_scroll_throw_handler()
180             if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
189             if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
193     /*Check if the scroll has finished*/  in lv_indev_scroll_throw_handler()
194     if(indev->pointer.scroll_throw_vect.x == 0 && indev->pointer.scroll_throw_vect.y == 0) {  in lv_indev_scroll_throw_handler()
195         /*Revert if scrolled in*/  in lv_indev_scroll_throw_handler()
196         /*If vertically scrollable and not controlled by snap*/  in lv_indev_scroll_throw_handler()
197         if(align_y == LV_SCROLL_SNAP_NONE) {  in lv_indev_scroll_throw_handler()
200             if(st > 0 || sb > 0) {  in lv_indev_scroll_throw_handler()
201                 if(st < 0) {  in lv_indev_scroll_throw_handler()
203                     if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
205                 else if(sb < 0) {  in lv_indev_scroll_throw_handler()
207                     if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
212         /*If horizontally scrollable and not controlled by snap*/  in lv_indev_scroll_throw_handler()
213         if(align_x == LV_SCROLL_SNAP_NONE) {  in lv_indev_scroll_throw_handler()
216             if(sl > 0 || sr > 0) {  in lv_indev_scroll_throw_handler()
217                 if(sl < 0) {  in lv_indev_scroll_throw_handler()
219                     if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
221                 else if(sr < 0) {  in lv_indev_scroll_throw_handler()
223                     if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
229         if(indev->reset_query) return;  in lv_indev_scroll_throw_handler()
238     if(indev == NULL) return 0;  in lv_indev_scroll_throw_predict()
277      * 3. If an object can be scrolled into the current direction then use it ("real match"")  in lv_indev_find_scroll_obj()
278 …* 4. If can be scrolled on the current axis (hor/ver) save it as candidate (at least show an elast…  in lv_indev_find_scroll_obj()
282     /*Decide if it's a horizontal or vertical scroll*/  in lv_indev_find_scroll_obj()
304         if(scale_x == 0) {  in lv_indev_find_scroll_obj()
308         if(scale_y == 0) {  in lv_indev_find_scroll_obj()
313         if(angle != 0 || scale_x != LV_SCALE_NONE || scale_y != LV_SCALE_NONE) {  in lv_indev_find_scroll_obj()
320         if(LV_ABS(obj_scroll_sum.x) > LV_ABS(obj_scroll_sum.y)) {  in lv_indev_find_scroll_obj()
327         if(lv_obj_has_flag(obj_act, LV_OBJ_FLAG_SCROLLABLE) == false) {  in lv_indev_find_scroll_obj()
328             /*If this object don't want to chain the scroll to the parent stop searching*/  in lv_indev_find_scroll_obj()
329             if(lv_obj_has_flag(obj_act, LV_OBJ_FLAG_SCROLL_CHAIN_HOR) == false && hor_en) break;  in lv_indev_find_scroll_obj()
330             if(lv_obj_has_flag(obj_act, LV_OBJ_FLAG_SCROLL_CHAIN_VER) == false && ver_en) break;  in lv_indev_find_scroll_obj()
344         if((scroll_dir & LV_DIR_LEFT) == 0) left_en = false;  in lv_indev_find_scroll_obj()
345         if((scroll_dir & LV_DIR_RIGHT) == 0) right_en = false;  in lv_indev_find_scroll_obj()
346         if((scroll_dir & LV_DIR_TOP) == 0) up_en = false;  in lv_indev_find_scroll_obj()
347         if((scroll_dir & LV_DIR_BOTTOM) == 0) down_en = false;  in lv_indev_find_scroll_obj()
353         if(snap_x == LV_SCROLL_SNAP_NONE) {  in lv_indev_find_scroll_obj()
363              *Assumed scroll in if there are NO more nap points*/  in lv_indev_find_scroll_obj()
372         if(snap_y == LV_SCROLL_SNAP_NONE) {  in lv_indev_find_scroll_obj()
382              *Assumed scroll in if there are NO more nap points*/  in lv_indev_find_scroll_obj()
387 …      /*If this object is scrollable into the current scroll direction then save it as a candidate.  in lv_indev_find_scroll_obj()
388          *It's important only to be scrollable on the current axis (hor/ver) because if the scroll  in lv_indev_find_scroll_obj()
390          *But if not hor/ver scrollable do not scroll it at all (so it's not a good candidate)*/  in lv_indev_find_scroll_obj()
391         if((st > 0 || sb > 0)  &&  in lv_indev_find_scroll_obj()
398         if((sl > 0 || sr > 0)  &&  in lv_indev_find_scroll_obj()
405         if(st <= 0) up_en = false;  in lv_indev_find_scroll_obj()
406         if(sb <= 0) down_en = false;  in lv_indev_find_scroll_obj()
407         if(sl <= 0) left_en = false;  in lv_indev_find_scroll_obj()
408         if(sr <= 0) right_en = false;  in lv_indev_find_scroll_obj()
410         /*If the object really can be scrolled into the current direction then use it.*/  in lv_indev_find_scroll_obj()
411         if((left_en  && obj_scroll_sum.x >=   scroll_limit) ||  in lv_indev_find_scroll_obj()
419         /*If this object don't want to chain the scroll to the parent stop searching*/  in lv_indev_find_scroll_obj()
420         if(lv_obj_has_flag(obj_act, LV_OBJ_FLAG_SCROLL_CHAIN_HOR) == false && hor_en) break;  in lv_indev_find_scroll_obj()
421         if(lv_obj_has_flag(obj_act, LV_OBJ_FLAG_SCROLL_CHAIN_VER) == false && ver_en) break;  in lv_indev_find_scroll_obj()
428     if(obj_candidate) {  in lv_indev_find_scroll_obj()
445     /*If there no STOP allow scrolling anywhere*/  in init_scroll_limits()
446     if(lv_obj_has_flag(obj, LV_OBJ_FLAG_SCROLL_ONE) == false) {  in init_scroll_limits()
496     if(indev->pointer.scroll_area.x1 == LV_COORD_MAX) indev->pointer.scroll_area.x1 = LV_COORD_MIN;  in init_scroll_limits()
497     if(indev->pointer.scroll_area.y1 == LV_COORD_MAX) indev->pointer.scroll_area.y1 = LV_COORD_MIN;  in init_scroll_limits()
500     if(indev->pointer.scroll_area.x1 == 0) indev->pointer.scroll_area.x1 = LV_COORD_MIN;  in init_scroll_limits()
501     if(indev->pointer.scroll_area.x2 == 0) indev->pointer.scroll_area.x2 = LV_COORD_MAX;  in init_scroll_limits()
502     if(indev->pointer.scroll_area.y1 == 0) indev->pointer.scroll_area.y1 = LV_COORD_MIN;  in init_scroll_limits()
503     if(indev->pointer.scroll_area.y2 == 0) indev->pointer.scroll_area.y2 = LV_COORD_MAX;  in init_scroll_limits()
512  *            what if children are already moved by this value
514  *         or `LV_COORD_MAX` if there is no snap point in the min..max range
519     if(align == LV_SCROLL_SNAP_NONE) return LV_COORD_MAX;  in find_snap_point_x()
530         if(lv_obj_has_flag_any(child, LV_OBJ_FLAG_HIDDEN | LV_OBJ_FLAG_FLOATING)) continue;  in find_snap_point_x()
531         if(lv_obj_has_flag(child, LV_OBJ_FLAG_SNAPPABLE)) {  in find_snap_point_x()
552             if(x_child >= min && x_child <= max) {  in find_snap_point_x()
554                 if(LV_ABS(x) < LV_ABS(dist)) dist = x;  in find_snap_point_x()
568  *            what if children are already moved by this value
570  *         or `LV_COORD_MAX` if there is no snap point in the min..max range
575     if(align == LV_SCROLL_SNAP_NONE) return LV_COORD_MAX;  in find_snap_point_y()
586         if(lv_obj_has_flag_any(child, LV_OBJ_FLAG_HIDDEN | LV_OBJ_FLAG_FLOATING)) continue;  in find_snap_point_y()
587         if(lv_obj_has_flag(child, LV_OBJ_FLAG_SNAPPABLE)) {  in find_snap_point_y()
608             if(y_child >= min && y_child <= max) {  in find_snap_point_y()
610                 if(LV_ABS(y) < LV_ABS(dist)) dist = y;  in find_snap_point_y()
620     if(diff_y) {  in scroll_limit_diff()
621         if(indev->pointer.scroll_sum.y + *diff_y < indev->pointer.scroll_area.y1) {  in scroll_limit_diff()
625         if(indev->pointer.scroll_sum.y + *diff_y > indev->pointer.scroll_area.y2) {  in scroll_limit_diff()
630     if(diff_x) {  in scroll_limit_diff()
631         if(indev->pointer.scroll_sum.x + *diff_x < indev->pointer.scroll_area.x1) {  in scroll_limit_diff()
635         if(indev->pointer.scroll_sum.x + *diff_x > indev->pointer.scroll_area.x2) {  in scroll_limit_diff()
644     if(diff == 0) return 0;  in elastic_diff()
646     /*Scroll back to the edge if required*/  in elastic_diff()
647     if(!lv_obj_has_flag(scroll_obj, LV_OBJ_FLAG_SCROLL_ELASTIC)) {  in elastic_diff()
649          * If the scrolling object does not set the `LV_OBJ_FLAG_SCROLL_ELASTIC` flag,  in elastic_diff()
651 …   * If the content has exceeded the boundary due to external factors like `LV_SCROLL_SNAP_CENTER`,  in elastic_diff()
655         if(scroll_ended < 0) diff = 0;  in elastic_diff()
656         else if(scroll_ended - diff < 0) diff = scroll_ended;  in elastic_diff()
665         if(snap == LV_SCROLL_SNAP_NONE) {  in elastic_diff()
666             if(scroll_end < 0 || scroll_start < 0) {  in elastic_diff()
668                 if(diff < 0) diff -= ELASTIC_SLOWNESS_FACTOR / 2;  in elastic_diff()
669                 if(diff > 0) diff += ELASTIC_SLOWNESS_FACTOR / 2;  in elastic_diff()
677         /*With snapping the widget is scrolled out if there are no more snap points  in elastic_diff()
683         if(!has_start_snap || !has_end_snap) {  in elastic_diff()
685             if(diff < 0) diff -= ELASTIC_SLOWNESS_FACTOR / 2;  in elastic_diff()
686             if(diff > 0) diff += ELASTIC_SLOWNESS_FACTOR / 2;  in elastic_diff()
699  * There is a snap point if there is a snapanble object in the given direction
716     if(dir == LV_DIR_HOR) {  in has_more_snap_points()
738         if(d == LV_COORD_MAX) *has_end_snap = false;  in has_more_snap_points()
740         if(d == LV_COORD_MAX) *has_start_snap = false;  in has_more_snap_points()
764         if(d == LV_COORD_MAX) *has_end_snap = false;  in has_more_snap_points()
766         if(d == LV_COORD_MAX) *has_start_snap = false;  in has_more_snap_points()