1 /**
2 * @file lv_flex.c
3 *
4 */
5
6 /*********************
7 * INCLUDES
8 *********************/
9 #include "../lv_layouts.h"
10
11 #if LV_USE_FLEX
12
13 /*********************
14 * DEFINES
15 *********************/
16
17 /**********************
18 * TYPEDEFS
19 **********************/
20 typedef struct {
21 lv_flex_align_t main_place;
22 lv_flex_align_t cross_place;
23 lv_flex_align_t track_place;
24 uint8_t row : 1;
25 uint8_t wrap : 1;
26 uint8_t rev : 1;
27 } flex_t;
28
29 typedef struct {
30 lv_obj_t * item;
31 lv_coord_t min_size;
32 lv_coord_t max_size;
33 lv_coord_t final_size;
34 uint32_t grow_value;
35 uint32_t clamped : 1;
36 } grow_dsc_t;
37
38 typedef struct {
39 lv_coord_t track_cross_size;
40 lv_coord_t track_main_size; /*For all items*/
41 lv_coord_t track_fix_main_size; /*For non grow items*/
42 uint32_t item_cnt;
43 grow_dsc_t * grow_dsc;
44 uint32_t grow_item_cnt;
45 uint32_t grow_dsc_calc : 1;
46 } track_t;
47
48 /**********************
49 * GLOBAL PROTOTYPES
50 **********************/
51
52 /**********************
53 * STATIC PROTOTYPES
54 **********************/
55 static void flex_update(lv_obj_t * cont, void * user_data);
56 static int32_t find_track_end(lv_obj_t * cont, flex_t * f, int32_t item_start_id, lv_coord_t max_main_size,
57 lv_coord_t item_gap, track_t * t);
58 static void children_repos(lv_obj_t * cont, flex_t * f, int32_t item_first_id, int32_t item_last_id, lv_coord_t abs_x,
59 lv_coord_t abs_y, lv_coord_t max_main_size, lv_coord_t item_gap, track_t * t);
60 static void place_content(lv_flex_align_t place, lv_coord_t max_size, lv_coord_t content_size, lv_coord_t item_cnt,
61 lv_coord_t * start_pos, lv_coord_t * gap);
62 static lv_obj_t * get_next_item(lv_obj_t * cont, bool rev, int32_t * item_id);
63
64 /**********************
65 * GLOBAL VARIABLES
66 **********************/
67 uint16_t LV_LAYOUT_FLEX;
68 lv_style_prop_t LV_STYLE_FLEX_FLOW;
69 lv_style_prop_t LV_STYLE_FLEX_MAIN_PLACE;
70 lv_style_prop_t LV_STYLE_FLEX_CROSS_PLACE;
71 lv_style_prop_t LV_STYLE_FLEX_TRACK_PLACE;
72 lv_style_prop_t LV_STYLE_FLEX_GROW;
73
74 /**********************
75 * STATIC VARIABLES
76 **********************/
77
78 /**********************
79 * MACROS
80 **********************/
81
82 /**********************
83 * GLOBAL FUNCTIONS
84 **********************/
85
86 /*=====================
87 * Setter functions
88 *====================*/
89
lv_flex_init(void)90 void lv_flex_init(void)
91 {
92 LV_LAYOUT_FLEX = lv_layout_register(flex_update, NULL);
93
94 LV_STYLE_FLEX_FLOW = lv_style_register_prop(LV_STYLE_PROP_FLAG_NONE);
95 LV_STYLE_FLEX_MAIN_PLACE = lv_style_register_prop(LV_STYLE_PROP_LAYOUT_REFR);
96 LV_STYLE_FLEX_CROSS_PLACE = lv_style_register_prop(LV_STYLE_PROP_LAYOUT_REFR);
97 LV_STYLE_FLEX_TRACK_PLACE = lv_style_register_prop(LV_STYLE_PROP_LAYOUT_REFR);
98 LV_STYLE_FLEX_GROW = lv_style_register_prop(LV_STYLE_PROP_LAYOUT_REFR);
99 }
100
lv_obj_set_flex_flow(lv_obj_t * obj,lv_flex_flow_t flow)101 void lv_obj_set_flex_flow(lv_obj_t * obj, lv_flex_flow_t flow)
102 {
103 lv_obj_set_style_flex_flow(obj, flow, 0);
104 lv_obj_set_style_layout(obj, LV_LAYOUT_FLEX, 0);
105 }
106
lv_obj_set_flex_align(lv_obj_t * obj,lv_flex_align_t main_place,lv_flex_align_t cross_place,lv_flex_align_t track_place)107 void lv_obj_set_flex_align(lv_obj_t * obj, lv_flex_align_t main_place, lv_flex_align_t cross_place,
108 lv_flex_align_t track_place)
109 {
110 lv_obj_set_style_flex_main_place(obj, main_place, 0);
111 lv_obj_set_style_flex_cross_place(obj, cross_place, 0);
112 lv_obj_set_style_flex_track_place(obj, track_place, 0);
113 lv_obj_set_style_layout(obj, LV_LAYOUT_FLEX, 0);
114 }
115
lv_obj_set_flex_grow(lv_obj_t * obj,uint8_t grow)116 void lv_obj_set_flex_grow(lv_obj_t * obj, uint8_t grow)
117 {
118 lv_obj_set_style_flex_grow(obj, grow, 0);
119 lv_obj_mark_layout_as_dirty(lv_obj_get_parent(obj));
120 }
121
lv_style_set_flex_flow(lv_style_t * style,lv_flex_flow_t value)122 void lv_style_set_flex_flow(lv_style_t * style, lv_flex_flow_t value)
123 {
124 lv_style_value_t v = {
125 .num = (int32_t)value
126 };
127 lv_style_set_prop(style, LV_STYLE_FLEX_FLOW, v);
128 }
129
lv_style_set_flex_main_place(lv_style_t * style,lv_flex_align_t value)130 void lv_style_set_flex_main_place(lv_style_t * style, lv_flex_align_t value)
131 {
132 lv_style_value_t v = {
133 .num = (int32_t)value
134 };
135 lv_style_set_prop(style, LV_STYLE_FLEX_MAIN_PLACE, v);
136 }
137
lv_style_set_flex_cross_place(lv_style_t * style,lv_flex_align_t value)138 void lv_style_set_flex_cross_place(lv_style_t * style, lv_flex_align_t value)
139 {
140 lv_style_value_t v = {
141 .num = (int32_t)value
142 };
143 lv_style_set_prop(style, LV_STYLE_FLEX_CROSS_PLACE, v);
144 }
145
lv_style_set_flex_track_place(lv_style_t * style,lv_flex_align_t value)146 void lv_style_set_flex_track_place(lv_style_t * style, lv_flex_align_t value)
147 {
148 lv_style_value_t v = {
149 .num = (int32_t)value
150 };
151 lv_style_set_prop(style, LV_STYLE_FLEX_TRACK_PLACE, v);
152 }
153
lv_style_set_flex_grow(lv_style_t * style,uint8_t value)154 void lv_style_set_flex_grow(lv_style_t * style, uint8_t value)
155 {
156 lv_style_value_t v = {
157 .num = (int32_t)value
158 };
159 lv_style_set_prop(style, LV_STYLE_FLEX_GROW, v);
160 }
161
lv_obj_set_style_flex_flow(lv_obj_t * obj,lv_flex_flow_t value,lv_style_selector_t selector)162 void lv_obj_set_style_flex_flow(lv_obj_t * obj, lv_flex_flow_t value, lv_style_selector_t selector)
163 {
164 lv_style_value_t v = {
165 .num = (int32_t) value
166 };
167 lv_obj_set_local_style_prop(obj, LV_STYLE_FLEX_FLOW, v, selector);
168 }
169
lv_obj_set_style_flex_main_place(lv_obj_t * obj,lv_flex_align_t value,lv_style_selector_t selector)170 void lv_obj_set_style_flex_main_place(lv_obj_t * obj, lv_flex_align_t value, lv_style_selector_t selector)
171 {
172 lv_style_value_t v = {
173 .num = (int32_t) value
174 };
175 lv_obj_set_local_style_prop(obj, LV_STYLE_FLEX_MAIN_PLACE, v, selector);
176 }
177
lv_obj_set_style_flex_cross_place(lv_obj_t * obj,lv_flex_align_t value,lv_style_selector_t selector)178 void lv_obj_set_style_flex_cross_place(lv_obj_t * obj, lv_flex_align_t value, lv_style_selector_t selector)
179 {
180 lv_style_value_t v = {
181 .num = (int32_t) value
182 };
183 lv_obj_set_local_style_prop(obj, LV_STYLE_FLEX_CROSS_PLACE, v, selector);
184 }
185
lv_obj_set_style_flex_track_place(lv_obj_t * obj,lv_flex_align_t value,lv_style_selector_t selector)186 void lv_obj_set_style_flex_track_place(lv_obj_t * obj, lv_flex_align_t value, lv_style_selector_t selector)
187 {
188 lv_style_value_t v = {
189 .num = (int32_t) value
190 };
191 lv_obj_set_local_style_prop(obj, LV_STYLE_FLEX_TRACK_PLACE, v, selector);
192 }
193
lv_obj_set_style_flex_grow(lv_obj_t * obj,uint8_t value,lv_style_selector_t selector)194 void lv_obj_set_style_flex_grow(lv_obj_t * obj, uint8_t value, lv_style_selector_t selector)
195 {
196 lv_style_value_t v = {
197 .num = (int32_t) value
198 };
199 lv_obj_set_local_style_prop(obj, LV_STYLE_FLEX_GROW, v, selector);
200 }
201
202 /**********************
203 * STATIC FUNCTIONS
204 **********************/
205
flex_update(lv_obj_t * cont,void * user_data)206 static void flex_update(lv_obj_t * cont, void * user_data)
207 {
208 LV_LOG_INFO("update %p container", (void *)cont);
209 LV_UNUSED(user_data);
210
211 flex_t f;
212 lv_flex_flow_t flow = lv_obj_get_style_flex_flow(cont, LV_PART_MAIN);
213 f.row = flow & _LV_FLEX_COLUMN ? 0 : 1;
214 f.wrap = flow & _LV_FLEX_WRAP ? 1 : 0;
215 f.rev = flow & _LV_FLEX_REVERSE ? 1 : 0;
216 f.main_place = lv_obj_get_style_flex_main_place(cont, LV_PART_MAIN);
217 f.cross_place = lv_obj_get_style_flex_cross_place(cont, LV_PART_MAIN);
218 f.track_place = lv_obj_get_style_flex_track_place(cont, LV_PART_MAIN);
219
220 bool rtl = lv_obj_get_style_base_dir(cont, LV_PART_MAIN) == LV_BASE_DIR_RTL ? true : false;
221 lv_coord_t track_gap = !f.row ? lv_obj_get_style_pad_column(cont, LV_PART_MAIN) : lv_obj_get_style_pad_row(cont,
222 LV_PART_MAIN);
223 lv_coord_t item_gap = f.row ? lv_obj_get_style_pad_column(cont, LV_PART_MAIN) : lv_obj_get_style_pad_row(cont,
224 LV_PART_MAIN);
225 lv_coord_t max_main_size = (f.row ? lv_obj_get_content_width(cont) : lv_obj_get_content_height(cont));
226 lv_coord_t border_width = lv_obj_get_style_border_width(cont, LV_PART_MAIN);
227 lv_coord_t abs_y = cont->coords.y1 + lv_obj_get_style_pad_top(cont,
228 LV_PART_MAIN) + border_width - lv_obj_get_scroll_y(cont);
229 lv_coord_t abs_x = cont->coords.x1 + lv_obj_get_style_pad_left(cont,
230 LV_PART_MAIN) + border_width - lv_obj_get_scroll_x(cont);
231
232 lv_flex_align_t track_cross_place = f.track_place;
233 lv_coord_t * cross_pos = (f.row ? &abs_y : &abs_x);
234
235 lv_coord_t w_set = lv_obj_get_style_width(cont, LV_PART_MAIN);
236 lv_coord_t h_set = lv_obj_get_style_height(cont, LV_PART_MAIN);
237
238 /*Content sized objects should squeezed the gap between the children, therefore any alignment will look like `START`*/
239 if((f.row && h_set == LV_SIZE_CONTENT && cont->h_layout == 0) ||
240 (!f.row && w_set == LV_SIZE_CONTENT && cont->w_layout == 0)) {
241 track_cross_place = LV_FLEX_ALIGN_START;
242 }
243
244 if(rtl && !f.row) {
245 if(track_cross_place == LV_FLEX_ALIGN_START) track_cross_place = LV_FLEX_ALIGN_END;
246 else if(track_cross_place == LV_FLEX_ALIGN_END) track_cross_place = LV_FLEX_ALIGN_START;
247 }
248
249 lv_coord_t total_track_cross_size = 0;
250 lv_coord_t gap = 0;
251 uint32_t track_cnt = 0;
252 int32_t track_first_item;
253 int32_t next_track_first_item;
254
255 if(track_cross_place != LV_FLEX_ALIGN_START) {
256 track_first_item = f.rev ? cont->spec_attr->child_cnt - 1 : 0;
257 track_t t;
258 while(track_first_item < (int32_t)cont->spec_attr->child_cnt && track_first_item >= 0) {
259 /*Search the first item of the next row*/
260 t.grow_dsc_calc = 0;
261 next_track_first_item = find_track_end(cont, &f, track_first_item, max_main_size, item_gap, &t);
262 total_track_cross_size += t.track_cross_size + track_gap;
263 track_cnt++;
264 track_first_item = next_track_first_item;
265 }
266
267 if(track_cnt) total_track_cross_size -= track_gap; /*No gap after the last track*/
268
269 /*Place the tracks to get the start position*/
270 lv_coord_t max_cross_size = (f.row ? lv_obj_get_content_height(cont) : lv_obj_get_content_width(cont));
271 place_content(track_cross_place, max_cross_size, total_track_cross_size, track_cnt, cross_pos, &gap);
272 }
273
274 track_first_item = f.rev ? cont->spec_attr->child_cnt - 1 : 0;
275
276 if(rtl && !f.row) {
277 *cross_pos += total_track_cross_size;
278 }
279
280 while(track_first_item < (int32_t)cont->spec_attr->child_cnt && track_first_item >= 0) {
281 track_t t;
282 t.grow_dsc_calc = 1;
283 /*Search the first item of the next row*/
284 next_track_first_item = find_track_end(cont, &f, track_first_item, max_main_size, item_gap, &t);
285
286 if(rtl && !f.row) {
287 *cross_pos -= t.track_cross_size;
288 }
289 children_repos(cont, &f, track_first_item, next_track_first_item, abs_x, abs_y, max_main_size, item_gap, &t);
290 track_first_item = next_track_first_item;
291 lv_mem_buf_release(t.grow_dsc);
292 t.grow_dsc = NULL;
293 if(rtl && !f.row) {
294 *cross_pos -= gap + track_gap;
295 }
296 else {
297 *cross_pos += t.track_cross_size + gap + track_gap;
298 }
299 }
300 LV_ASSERT_MEM_INTEGRITY();
301
302 if(w_set == LV_SIZE_CONTENT || h_set == LV_SIZE_CONTENT) {
303 lv_obj_refr_size(cont);
304 }
305
306 lv_event_send(cont, LV_EVENT_LAYOUT_CHANGED, NULL);
307
308 LV_TRACE_LAYOUT("finished");
309 }
310
311 /**
312 * Find the last item of a track
313 */
find_track_end(lv_obj_t * cont,flex_t * f,int32_t item_start_id,lv_coord_t max_main_size,lv_coord_t item_gap,track_t * t)314 static int32_t find_track_end(lv_obj_t * cont, flex_t * f, int32_t item_start_id, lv_coord_t max_main_size,
315 lv_coord_t item_gap, track_t * t)
316 {
317 lv_coord_t w_set = lv_obj_get_style_width(cont, LV_PART_MAIN);
318 lv_coord_t h_set = lv_obj_get_style_height(cont, LV_PART_MAIN);
319
320 /*Can't wrap if the size if auto (i.e. the size depends on the children)*/
321 if(f->wrap && ((f->row && w_set == LV_SIZE_CONTENT) || (!f->row && h_set == LV_SIZE_CONTENT))) {
322 f->wrap = false;
323 }
324 lv_coord_t(*get_main_size)(const lv_obj_t *) = (f->row ? lv_obj_get_width : lv_obj_get_height);
325 lv_coord_t(*get_cross_size)(const lv_obj_t *) = (!f->row ? lv_obj_get_width : lv_obj_get_height);
326
327 t->track_main_size = 0;
328 t->track_fix_main_size = 0;
329 t->grow_item_cnt = 0;
330 t->track_cross_size = 0;
331 t->item_cnt = 0;
332 t->grow_dsc = NULL;
333
334 int32_t item_id = item_start_id;
335
336 lv_obj_t * item = lv_obj_get_child(cont, item_id);
337 while(item) {
338 if(item_id != item_start_id && lv_obj_has_flag(item, LV_OBJ_FLAG_FLEX_IN_NEW_TRACK)) break;
339
340 if(!lv_obj_has_flag_any(item, LV_OBJ_FLAG_IGNORE_LAYOUT | LV_OBJ_FLAG_HIDDEN | LV_OBJ_FLAG_FLOATING)) {
341 uint8_t grow_value = lv_obj_get_style_flex_grow(item, LV_PART_MAIN);
342 if(grow_value) {
343 t->grow_item_cnt++;
344 t->track_fix_main_size += item_gap;
345 if(t->grow_dsc_calc) {
346 grow_dsc_t * new_dsc = lv_mem_buf_get(sizeof(grow_dsc_t) * (t->grow_item_cnt));
347 LV_ASSERT_MALLOC(new_dsc);
348 if(new_dsc == NULL) return item_id;
349
350 if(t->grow_dsc) {
351 lv_memcpy(new_dsc, t->grow_dsc, sizeof(grow_dsc_t) * (t->grow_item_cnt - 1));
352 lv_mem_buf_release(t->grow_dsc);
353 }
354 new_dsc[t->grow_item_cnt - 1].item = item;
355 new_dsc[t->grow_item_cnt - 1].min_size = f->row ? lv_obj_get_style_min_width(item,
356 LV_PART_MAIN) : lv_obj_get_style_min_height(item, LV_PART_MAIN);
357 new_dsc[t->grow_item_cnt - 1].max_size = f->row ? lv_obj_get_style_max_width(item,
358 LV_PART_MAIN) : lv_obj_get_style_max_height(item, LV_PART_MAIN);
359 new_dsc[t->grow_item_cnt - 1].grow_value = grow_value;
360 new_dsc[t->grow_item_cnt - 1].clamped = 0;
361 t->grow_dsc = new_dsc;
362 }
363 }
364 else {
365 lv_coord_t item_size = get_main_size(item);
366 if(f->wrap && t->track_fix_main_size + item_size > max_main_size) break;
367 t->track_fix_main_size += item_size + item_gap;
368 }
369
370 t->track_cross_size = LV_MAX(get_cross_size(item), t->track_cross_size);
371 t->item_cnt++;
372 }
373
374 item_id += f->rev ? -1 : +1;
375 if(item_id < 0) break;
376 item = lv_obj_get_child(cont, item_id);
377 }
378
379 if(t->track_fix_main_size > 0) t->track_fix_main_size -= item_gap; /*There is no gap after the last item*/
380
381 /*If there is at least one "grow item" the track takes the full space*/
382 t->track_main_size = t->grow_item_cnt ? max_main_size : t->track_fix_main_size;
383
384 /*Have at least one item in a row*/
385 if(item && item_id == item_start_id) {
386 item = cont->spec_attr->children[item_id];
387 get_next_item(cont, f->rev, &item_id);
388 if(item) {
389 t->track_cross_size = get_cross_size(item);
390 t->track_main_size = get_main_size(item);
391 t->item_cnt = 1;
392 }
393 }
394
395 return item_id;
396 }
397
398 /**
399 * Position the children in the same track
400 */
children_repos(lv_obj_t * cont,flex_t * f,int32_t item_first_id,int32_t item_last_id,lv_coord_t abs_x,lv_coord_t abs_y,lv_coord_t max_main_size,lv_coord_t item_gap,track_t * t)401 static void children_repos(lv_obj_t * cont, flex_t * f, int32_t item_first_id, int32_t item_last_id, lv_coord_t abs_x,
402 lv_coord_t abs_y, lv_coord_t max_main_size, lv_coord_t item_gap, track_t * t)
403 {
404 void (*area_set_main_size)(lv_area_t *, lv_coord_t) = (f->row ? lv_area_set_width : lv_area_set_height);
405 lv_coord_t (*area_get_main_size)(const lv_area_t *) = (f->row ? lv_area_get_width : lv_area_get_height);
406 lv_coord_t (*area_get_cross_size)(const lv_area_t *) = (!f->row ? lv_area_get_width : lv_area_get_height);
407
408 /*Calculate the size of grow items first*/
409 uint32_t i;
410 bool grow_reiterate = true;
411 while(grow_reiterate) {
412 grow_reiterate = false;
413 lv_coord_t grow_value_sum = 0;
414 lv_coord_t grow_max_size = t->track_main_size - t->track_fix_main_size;
415 for(i = 0; i < t->grow_item_cnt; i++) {
416 if(t->grow_dsc[i].clamped == 0) {
417 grow_value_sum += t->grow_dsc[i].grow_value;
418 }
419 else {
420 grow_max_size -= t->grow_dsc[i].final_size;
421 }
422 }
423 lv_coord_t grow_unit;
424
425 for(i = 0; i < t->grow_item_cnt; i++) {
426 if(t->grow_dsc[i].clamped == 0) {
427 LV_ASSERT(grow_value_sum != 0);
428 grow_unit = grow_max_size / grow_value_sum;
429 lv_coord_t size = grow_unit * t->grow_dsc[i].grow_value;
430 lv_coord_t size_clamp = LV_CLAMP(t->grow_dsc[i].min_size, size, t->grow_dsc[i].max_size);
431
432 if(size_clamp != size) {
433 t->grow_dsc[i].clamped = 1;
434 grow_reiterate = true;
435 }
436 t->grow_dsc[i].final_size = size_clamp;
437 grow_value_sum -= t->grow_dsc[i].grow_value;
438 grow_max_size -= t->grow_dsc[i].final_size;
439 }
440 }
441 }
442
443 bool rtl = lv_obj_get_style_base_dir(cont, LV_PART_MAIN) == LV_BASE_DIR_RTL ? true : false;
444
445 lv_coord_t main_pos = 0;
446
447 lv_coord_t place_gap = 0;
448 place_content(f->main_place, max_main_size, t->track_main_size, t->item_cnt, &main_pos, &place_gap);
449 if(f->row && rtl) main_pos += lv_obj_get_content_width(cont);
450
451 lv_obj_t * item = lv_obj_get_child(cont, item_first_id);
452 /*Reposition the children*/
453 while(item && item_first_id != item_last_id) {
454 if(lv_obj_has_flag_any(item, LV_OBJ_FLAG_IGNORE_LAYOUT | LV_OBJ_FLAG_HIDDEN | LV_OBJ_FLAG_FLOATING)) {
455 item = get_next_item(cont, f->rev, &item_first_id);
456 continue;
457 }
458 lv_coord_t grow_size = lv_obj_get_style_flex_grow(item, LV_PART_MAIN);
459 if(grow_size) {
460 lv_coord_t s = 0;
461 for(i = 0; i < t->grow_item_cnt; i++) {
462 if(t->grow_dsc[i].item == item) {
463 s = t->grow_dsc[i].final_size;
464 break;
465 }
466 }
467
468 if(f->row) {
469 item->w_layout = 1;
470 item->h_layout = 0;
471 }
472 else {
473 item->h_layout = 1;
474 item->w_layout = 0;
475 }
476
477 if(s != area_get_main_size(&item->coords)) {
478 lv_obj_invalidate(item);
479
480 lv_area_t old_coords;
481 lv_area_copy(&old_coords, &item->coords);
482 area_set_main_size(&item->coords, s);
483 lv_event_send(item, LV_EVENT_SIZE_CHANGED, &old_coords);
484 lv_event_send(lv_obj_get_parent(item), LV_EVENT_CHILD_CHANGED, item);
485 lv_obj_invalidate(item);
486 }
487 }
488 else {
489 item->w_layout = 0;
490 item->h_layout = 0;
491 }
492
493 lv_coord_t cross_pos = 0;
494 switch(f->cross_place) {
495 case LV_FLEX_ALIGN_CENTER:
496 /*Round up the cross size to avoid rounding error when dividing by 2
497 *The issue comes up e,g, with column direction with center cross direction if an element's width changes*/
498 cross_pos = (((t->track_cross_size + 1) & (~1)) - area_get_cross_size(&item->coords)) / 2;
499 break;
500 case LV_FLEX_ALIGN_END:
501 cross_pos = t->track_cross_size - area_get_cross_size(&item->coords);
502 break;
503 default:
504 break;
505 }
506
507 if(f->row && rtl) main_pos -= area_get_main_size(&item->coords);
508
509 /*Handle percentage value of translate*/
510 lv_coord_t tr_x = lv_obj_get_style_translate_x(item, LV_PART_MAIN);
511 lv_coord_t tr_y = lv_obj_get_style_translate_y(item, LV_PART_MAIN);
512 lv_coord_t w = lv_obj_get_width(item);
513 lv_coord_t h = lv_obj_get_height(item);
514 if(LV_COORD_IS_PCT(tr_x)) tr_x = (w * LV_COORD_GET_PCT(tr_x)) / 100;
515 if(LV_COORD_IS_PCT(tr_y)) tr_y = (h * LV_COORD_GET_PCT(tr_y)) / 100;
516
517 lv_coord_t diff_x = abs_x - item->coords.x1 + tr_x;
518 lv_coord_t diff_y = abs_y - item->coords.y1 + tr_y;
519 diff_x += f->row ? main_pos : cross_pos;
520 diff_y += f->row ? cross_pos : main_pos;
521
522 if(diff_x || diff_y) {
523 lv_obj_invalidate(item);
524 item->coords.x1 += diff_x;
525 item->coords.x2 += diff_x;
526 item->coords.y1 += diff_y;
527 item->coords.y2 += diff_y;
528 lv_obj_invalidate(item);
529 lv_obj_move_children_by(item, diff_x, diff_y, false);
530 }
531
532 if(!(f->row && rtl)) main_pos += area_get_main_size(&item->coords) + item_gap + place_gap;
533 else main_pos -= item_gap + place_gap;
534
535 item = get_next_item(cont, f->rev, &item_first_id);
536 }
537 }
538
539 /**
540 * Tell a start coordinate and gap for a placement type.
541 */
place_content(lv_flex_align_t place,lv_coord_t max_size,lv_coord_t content_size,lv_coord_t item_cnt,lv_coord_t * start_pos,lv_coord_t * gap)542 static void place_content(lv_flex_align_t place, lv_coord_t max_size, lv_coord_t content_size, lv_coord_t item_cnt,
543 lv_coord_t * start_pos, lv_coord_t * gap)
544 {
545 if(item_cnt <= 1) {
546 switch(place) {
547 case LV_FLEX_ALIGN_SPACE_BETWEEN:
548 case LV_FLEX_ALIGN_SPACE_AROUND:
549 case LV_FLEX_ALIGN_SPACE_EVENLY:
550 place = LV_FLEX_ALIGN_CENTER;
551 break;
552 default:
553 break;
554 }
555 }
556
557 switch(place) {
558 case LV_FLEX_ALIGN_CENTER:
559 *gap = 0;
560 *start_pos += (max_size - content_size) / 2;
561 break;
562 case LV_FLEX_ALIGN_END:
563 *gap = 0;
564 *start_pos += max_size - content_size;
565 break;
566 case LV_FLEX_ALIGN_SPACE_BETWEEN:
567 *gap = (lv_coord_t)(max_size - content_size) / (lv_coord_t)(item_cnt - 1);
568 break;
569 case LV_FLEX_ALIGN_SPACE_AROUND:
570 *gap += (lv_coord_t)(max_size - content_size) / (lv_coord_t)(item_cnt);
571 *start_pos += *gap / 2;
572 break;
573 case LV_FLEX_ALIGN_SPACE_EVENLY:
574 *gap = (lv_coord_t)(max_size - content_size) / (lv_coord_t)(item_cnt + 1);
575 *start_pos += *gap;
576 break;
577 default:
578 *gap = 0;
579 }
580 }
581
get_next_item(lv_obj_t * cont,bool rev,int32_t * item_id)582 static lv_obj_t * get_next_item(lv_obj_t * cont, bool rev, int32_t * item_id)
583 {
584 if(rev) {
585 (*item_id)--;
586 if(*item_id >= 0) return cont->spec_attr->children[*item_id];
587 else return NULL;
588 }
589 else {
590 (*item_id)++;
591 if((*item_id) < (int32_t)cont->spec_attr->child_cnt) return cont->spec_attr->children[*item_id];
592 else return NULL;
593 }
594 }
595
596 #endif /*LV_USE_FLEX*/
597
