1
/**
2
 * @file lv_roller.c
3
 *
4
 */
5

6
/*********************
7
 *      INCLUDES
8
 *********************/
9
#include "lv_roller.h"
10
#if USE_LV_ROLLER != 0
11

12
#include "../lv_draw/lv_draw.h"
13
#include "../lv_core/lv_group.h"
14
#include "../lv_themes/lv_theme.h"
15

16
/*********************
17
 *      DEFINES
18
 *********************/
19
#if USE_LV_ANIMATION
20
#  ifndef LV_ROLLER_ANIM_TIME
21
#    define LV_ROLLER_ANIM_TIME     200         /*ms*/
22
#  endif
23
#else
24
#  undef  LV_ROLLER_ANIM_TIME
25
#  define LV_ROLLER_ANIM_TIME       0           /*No animation*/
26
#endif
27

28
/**********************
29
 *      TYPEDEFS
30
 **********************/
31

32
/**********************
33
 *  STATIC PROTOTYPES
34
 **********************/
35
static bool lv_roller_design(lv_obj_t * roller, const lv_area_t * mask, lv_design_mode_t mode);
36
static lv_res_t lv_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param);
37
static lv_res_t lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * param);
38
static void refr_position(lv_obj_t * roller, bool anim_en);
39
static void draw_bg(lv_obj_t * roller, const lv_area_t * mask);
40

41
/**********************
42
 *  STATIC VARIABLES
43
 **********************/
44
static lv_signal_func_t ancestor_signal;
45
static lv_signal_func_t ancestor_scrl_signal;
46

47
/**********************
48
 *      MACROS
49
 **********************/
50

51
/**********************
52
 *   GLOBAL FUNCTIONS
53
 **********************/
54

55
/**
56
 * Create a roller object
57
 * @param par pointer to an object, it will be the parent of the new roller
58
 * @param copy pointer to a roller object, if not NULL then the new object will be copied from it
59
 * @return pointer to the created roller
60
 */
61
lv_obj_t * lv_roller_create(lv_obj_t * par, const lv_obj_t * copy)
62
{
63
    LV_LOG_TRACE("roller create started");
64

65
    /*Create the ancestor of roller*/
66
    lv_obj_t * new_roller = lv_ddlist_create(par, copy);
67
    lv_mem_assert(new_roller);
68
    if(new_roller == NULL) return NULL;
69

70
    if(ancestor_scrl_signal == NULL) ancestor_scrl_signal = lv_obj_get_signal_func(lv_page_get_scrl(new_roller));
71
    if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_roller);
72

73
    /*Allocate the roller type specific extended data*/
74
    lv_roller_ext_t * ext = lv_obj_allocate_ext_attr(new_roller, sizeof(lv_roller_ext_t));
75
    lv_mem_assert(ext);
76
    if(ext == NULL) return NULL;
77
    ext->ddlist.draw_arrow = 0;  /*Do not draw arrow by default*/
78

79
    /*The signal and design functions are not copied so set them here*/
80
    lv_obj_set_signal_func(new_roller, lv_roller_signal);
81
    lv_obj_set_design_func(new_roller, lv_roller_design);
82

83
    /*Init the new roller roller*/
84
    if(copy == NULL) {
85
        lv_obj_t * scrl = lv_page_get_scrl(new_roller);
86
        lv_obj_set_drag(scrl, true);                        /*In ddlist is might be disabled*/
87
        lv_page_set_rel_action(new_roller, NULL);       /*Roller don't uses it (like ddlist)*/
88
        lv_page_set_scrl_fit(new_roller, true, false);      /*Height is specified directly*/
89
        lv_ddlist_open(new_roller, false);
90
        lv_ddlist_set_anim_time(new_roller, LV_ROLLER_ANIM_TIME);
91
        lv_roller_set_visible_row_count(new_roller, 3);
92
        lv_label_set_align(ext->ddlist.label, LV_LABEL_ALIGN_CENTER);
93

94
        lv_obj_set_signal_func(scrl, lv_roller_scrl_signal);
95

96
        /*Set the default styles*/
97
        lv_theme_t * th = lv_theme_get_current();
98
        if(th) {
99
            lv_roller_set_style(new_roller, LV_ROLLER_STYLE_BG, th->roller.bg);
100
            lv_roller_set_style(new_roller, LV_ROLLER_STYLE_SEL, th->roller.sel);
101
        } else {
102
            /*Let the ddlist's style*/
103
            lv_obj_refresh_style(new_roller);                /*To set scrollable size automatically*/
104
        }
105
    }
106
    /*Copy an existing roller*/
107
    else {
108
        lv_obj_t * scrl = lv_page_get_scrl(new_roller);
109
        lv_ddlist_open(new_roller, false);
110
        lv_obj_set_signal_func(scrl, lv_roller_scrl_signal);
111

112
        lv_obj_refresh_style(new_roller);        /*Refresh the style with new signal function*/
113
    }
114

115

116
    LV_LOG_INFO("roller created");
117

118

119
    return new_roller;
120
}
121

122
/*=====================
123
 * Setter functions
124
 *====================*/
125

126
/**
127
 * Set the align of the roller's options (left or center)
128
 * @param roller - pointer to a roller object
129
 * @param align - one of lv_label_align_t values (left, right, center)
130
 */
131
void lv_roller_set_align(lv_obj_t * roller, lv_label_align_t align)
132
{
133
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
134
    lv_mem_assert(ext);
135
    if(ext->ddlist.label == NULL) return;   /*Probably the roller is being deleted if the label is NULL.*/
136
    lv_label_set_align(ext->ddlist.label, align);
137
}
138

139
/**
140
 * Set the selected option
141
 * @param roller pointer to a roller object
142
 * @param sel_opt id of the selected option (0 ... number of option - 1);
143
 * @param anim_en true: set with animation; false set immediately
144
 */
145
void lv_roller_set_selected(lv_obj_t * roller, uint16_t sel_opt, bool anim_en)
146
{
147
#if USE_LV_ANIMATION == 0
148
    anim_en = false;
149
#endif
150

151
    if(lv_roller_get_selected(roller) == sel_opt) return;
152

153
    lv_ddlist_set_selected(roller, sel_opt);
154
    refr_position(roller, anim_en);
155
}
156

157
/**
158
 * Set the height to show the given number of rows (options)
159
 * @param roller pointer to a roller object
160
 * @param row_cnt number of desired visible rows
161
 */
162
void lv_roller_set_visible_row_count(lv_obj_t * roller, uint8_t row_cnt)
163
{
164
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
165
    lv_style_t * style_label = lv_obj_get_style(ext->ddlist.label);
166
    uint8_t n_line_space = (row_cnt > 1) ? row_cnt - 1 : 1;
167
    lv_ddlist_set_fix_height(roller, lv_font_get_height(style_label->text.font) * row_cnt + style_label->text.line_space * n_line_space);
168
}
169

170
/**
171
 * Set a style of a roller
172
 * @param roller pointer to a roller object
173
 * @param type which style should be set
174
 * @param style pointer to a style
175
 */
176
void lv_roller_set_style(lv_obj_t * roller, lv_roller_style_t type, lv_style_t * style)
177
{
178
    switch(type) {
179
        case LV_ROLLER_STYLE_BG:
180
            lv_obj_set_style(roller, style);
181
            break;
182
        case LV_ROLLER_STYLE_SEL:
183
            lv_ddlist_set_style(roller, LV_DDLIST_STYLE_SEL, style);
184
            break;
185
    }
186
}
187

188
/*=====================
189
 * Getter functions
190
 *====================*/
191

192
/**
193
 * Get the align attribute. Default alignment after _create is LV_LABEL_ALIGN_CENTER
194
 * @param roller pointer to a roller object
195
 * @return LV_LABEL_ALIGN_LEFT, LV_LABEL_ALIGN_RIGHT or LV_LABEL_ALIGN_CENTER
196
 */
197
lv_label_align_t lv_roller_get_align(const lv_obj_t * roller)
198
{
199
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
200
    lv_mem_assert(ext);
201
    lv_mem_assert(ext->ddlist.label);
202
    return lv_label_get_align(ext->ddlist.label);
203
}
204

205
/**
206
 * Get the auto width set attribute
207
 * @param roller pointer to a roller object
208
 * @return true: auto size enabled; false: manual width settings enabled
209
 */
210
bool lv_roller_get_hor_fit(const lv_obj_t * roller)
211
{
212
    return lv_page_get_scrl_hor_fit(roller);
213
}
214

215
/**
216
 * Get a style of a roller
217
 * @param roller pointer to a roller object
218
 * @param type which style should be get
219
 * @return style pointer to a style
220
 *  */
221
lv_style_t * lv_roller_get_style(const lv_obj_t * roller, lv_roller_style_t type)
222
{
223
    switch(type) {
224
        case LV_ROLLER_STYLE_BG:
225
            return lv_obj_get_style(roller);
226
        case LV_ROLLER_STYLE_SEL:
227
            return lv_ddlist_get_style(roller, LV_DDLIST_STYLE_SEL);
228
        default:
229
            return NULL;
230
    }
231

232
    /*To avoid warning*/
233
    return NULL;
234
}
235

236
/**********************
237
 *   STATIC FUNCTIONS
238
 **********************/
239

240
/**
241
 * Handle the drawing related tasks of the rollers
242
 * @param roller pointer to an object
243
 * @param mask the object will be drawn only in this area
244
 * @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
245
 *                                  (return 'true' if yes)
246
 *             LV_DESIGN_DRAW: draw the object (always return 'true')
247
 *             LV_DESIGN_DRAW_POST: drawing after every children are drawn
248
 * @param return true/false, depends on 'mode'
249
 */
250
static bool lv_roller_design(lv_obj_t * roller, const lv_area_t * mask, lv_design_mode_t mode)
251
{
252
    /*Return false if the object is not covers the mask_p area*/
253
    if(mode == LV_DESIGN_COVER_CHK) {
254
        return false;
255
    }
256
    /*Draw the object*/
257
    else if(mode == LV_DESIGN_DRAW_MAIN) {
258
        draw_bg(roller, mask);
259

260
        lv_style_t * style = lv_roller_get_style(roller, LV_ROLLER_STYLE_BG);
261
        lv_opa_t opa_scale = lv_obj_get_opa_scale(roller);
262
        const lv_font_t * font = style->text.font;
263
        lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
264
        lv_coord_t font_h = lv_font_get_height(font);
265
        lv_area_t rect_area;
266
        rect_area.y1 = roller->coords.y1 + lv_obj_get_height(roller) / 2 - font_h / 2 - style->text.line_space / 2;
267
        if((font_h & 0x1) && (style->text.line_space & 0x1)) rect_area.y1 --;       /*Compensate the two rounding error*/
268
        rect_area.y2 = rect_area.y1 + font_h + style->text.line_space - 1;
269
        rect_area.x1 = roller->coords.x1;
270
        rect_area.x2 = roller->coords.x2;
271

272
        lv_draw_rect(&rect_area, mask, ext->ddlist.sel_style, opa_scale);
273
    }
274
    /*Post draw when the children are drawn*/
275
    else if(mode == LV_DESIGN_DRAW_POST) {
276
        lv_style_t * style = lv_roller_get_style(roller, LV_ROLLER_STYLE_BG);
277
        lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
278
        const lv_font_t * font = style->text.font;
279
        lv_coord_t font_h = lv_font_get_height(font);
280
        lv_opa_t opa_scale = lv_obj_get_opa_scale(roller);
281

282
        /*Redraw the text on the selected area with a different color*/
283
        lv_area_t rect_area;
284
        rect_area.y1 = roller->coords.y1 + lv_obj_get_height(roller) / 2 - font_h / 2 - style->text.line_space / 2;
285
        if((font_h & 0x1) && (style->text.line_space & 0x1)) rect_area.y1 --;       /*Compensate the two rounding error*/
286
        rect_area.y2 = rect_area.y1 + font_h + style->text.line_space - 1;
287
        rect_area.x1 = roller->coords.x1;
288
        rect_area.x2 = roller->coords.x2;
289
        lv_area_t mask_sel;
290
        bool area_ok;
291
        area_ok = lv_area_intersect(&mask_sel, mask, &rect_area);
292
        if(area_ok) {
293
            lv_style_t * sel_style = lv_roller_get_style(roller, LV_ROLLER_STYLE_SEL);
294
            lv_style_t new_style;
295
            lv_txt_flag_t txt_align = LV_TXT_FLAG_NONE;
296

297
            {
298
                lv_label_align_t label_align = lv_label_get_align(ext->ddlist.label);
299

300
                if(LV_LABEL_ALIGN_CENTER == label_align) {
301
                    txt_align |= LV_TXT_FLAG_CENTER;
302
                } else if(LV_LABEL_ALIGN_RIGHT == label_align) {
303
                    txt_align |= LV_TXT_FLAG_RIGHT;
304
                }
305
            }
306

307
            lv_style_copy(&new_style, style);
308
            new_style.text.color = sel_style->text.color;
309
            new_style.text.opa = sel_style->text.opa;
310
            lv_draw_label(&ext->ddlist.label->coords, &mask_sel, &new_style, opa_scale,
311
                          lv_label_get_text(ext->ddlist.label), txt_align, NULL);
312
        }
313
    }
314

315
    return true;
316
}
317

318
/**
319
 * Signal function of the roller
320
 * @param roller pointer to a roller object
321
 * @param sign a signal type from lv_signal_t enum
322
 * @param param pointer to a signal specific variable
323
 * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
324
 */
325
static lv_res_t lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * param)
326
{
327
    lv_res_t res  = LV_RES_OK;
328

329
    /*Don't let the drop down list to handle the control signals. It works differently*/
330
    if(sign != LV_SIGNAL_CONTROLL && sign != LV_SIGNAL_FOCUS && sign != LV_SIGNAL_DEFOCUS) {
331
        /* Include the ancient signal function */
332
        res = ancestor_signal(roller, sign, param);
333
        if(res != LV_RES_OK) return res;
334
    }
335

336
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
337
    lv_align_t obj_align = LV_ALIGN_IN_LEFT_MID;
338
    if(ext->ddlist.label) {
339
        lv_label_align_t label_align = lv_label_get_align(ext->ddlist.label);
340
        if(LV_LABEL_ALIGN_CENTER == label_align) obj_align = LV_ALIGN_CENTER;
341
        else if(LV_LABEL_ALIGN_RIGHT == label_align) obj_align = LV_ALIGN_IN_RIGHT_MID;
342
    }
343

344
    if(sign == LV_SIGNAL_STYLE_CHG) {
345
        lv_obj_set_height(lv_page_get_scrl(roller),
346
                          lv_obj_get_height(ext->ddlist.label) + lv_obj_get_height(roller));
347
        lv_obj_align(ext->ddlist.label, NULL, obj_align, 0, 0);
348
        lv_ddlist_set_selected(roller, ext->ddlist.sel_opt_id);
349
        refr_position(roller, false);
350
    } else if(sign == LV_SIGNAL_CORD_CHG) {
351

352
        if(lv_obj_get_width(roller) != lv_area_get_width(param) ||
353
                lv_obj_get_height(roller) != lv_area_get_height(param)) {
354

355
            lv_ddlist_set_fix_height(roller, lv_obj_get_height(roller));
356
            lv_obj_set_height(lv_page_get_scrl(roller),
357
                              lv_obj_get_height(ext->ddlist.label) + lv_obj_get_height(roller));
358

359
            lv_obj_align(ext->ddlist.label, NULL, obj_align, 0, 0);
360
            lv_ddlist_set_selected(roller, ext->ddlist.sel_opt_id);
361
            refr_position(roller, false);
362
        }
363
    } else if(sign == LV_SIGNAL_FOCUS) {
364
#if USE_LV_GROUP
365
        lv_group_t * g = lv_obj_get_group(roller);
366
        bool editing = lv_group_get_editing(g);
367
        lv_hal_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
368

369
        /*Encoders need special handling*/
370
        if(indev_type == LV_INDEV_TYPE_ENCODER) {
371
            /*In navigate mode revert the original value*/
372
            if(!editing) {
373
                if(ext->ddlist.sel_opt_id != ext->ddlist.sel_opt_id_ori) {
374
                    ext->ddlist.sel_opt_id = ext->ddlist.sel_opt_id_ori;
375
                    refr_position(roller, true);
376
                }
377
            }
378
            /*Save the current state when entered to edit mode*/
379
            else {
380
                ext->ddlist.sel_opt_id_ori = ext->ddlist.sel_opt_id;
381
            }
382
        } else {
383
            ext->ddlist.sel_opt_id_ori = ext->ddlist.sel_opt_id;      /*Save the current value. Used to revert this state if ENER wont't be pressed*/
384

385
        }
386
#endif
387
    } else if(sign == LV_SIGNAL_DEFOCUS) {
388
#if USE_LV_GROUP
389
        /*Revert the original state*/
390
        if(ext->ddlist.sel_opt_id != ext->ddlist.sel_opt_id_ori) {
391
            ext->ddlist.sel_opt_id = ext->ddlist.sel_opt_id_ori;
392
            refr_position(roller, true);
393
        }
394
#endif
395
    } else if(sign == LV_SIGNAL_CONTROLL) {
396
        char c = *((char *)param);
397
        if(c == LV_GROUP_KEY_RIGHT || c == LV_GROUP_KEY_DOWN) {
398
            if(ext->ddlist.sel_opt_id + 1 < ext->ddlist.option_cnt) {
399
                lv_roller_set_selected(roller, ext->ddlist.sel_opt_id + 1, true);
400
            }
401
        } else if(c == LV_GROUP_KEY_LEFT || c == LV_GROUP_KEY_UP) {
402
            if(ext->ddlist.sel_opt_id > 0) {
403
                lv_roller_set_selected(roller, ext->ddlist.sel_opt_id - 1, true);
404
            }
405
        } else if(c == LV_GROUP_KEY_ENTER) {
406
            ext->ddlist.sel_opt_id_ori = ext->ddlist.sel_opt_id;        /*Set the entered value as default*/
407
            if(ext->ddlist.action) ext->ddlist.action(roller);
408

409
#if USE_LV_GROUP
410
            lv_group_t * g = lv_obj_get_group(roller);
411
            bool editing = lv_group_get_editing(g);
412
            if(editing) lv_group_set_editing(g, false);     /*In edit mode go to navigate mode if an option is selected*/
413
#endif
414
        }
415
    } else if(sign == LV_SIGNAL_GET_TYPE) {
416
        lv_obj_type_t * buf = param;
417
        uint8_t i;
418
        for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) {  /*Find the last set data*/
419
            if(buf->type[i] == NULL) break;
420
        }
421
        buf->type[i] = "lv_roller";
422
    }
423

424
    return res;
425
}
426

427
/**
428
 * Signal function of the scrollable part of the roller.
429
 * @param roller_scrl ointer to the scrollable part of roller (page)
430
 * @param sign a signal type from lv_signal_t enum
431
 * @param param pointer to a signal specific variable
432
 * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
433
 */
434
static lv_res_t lv_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param)
435
{
436
    lv_res_t res;
437

438
    /* Include the ancient signal function */
439
    res = ancestor_scrl_signal(roller_scrl, sign, param);
440
    if(res != LV_RES_OK) return res;
441

442
    lv_indev_t * indev = lv_indev_get_act();
443
    int32_t id = -1;
444
    lv_obj_t * roller = lv_obj_get_parent(roller_scrl);
445
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
446

447
    if(ext->ddlist.label == NULL) return LV_RES_INV;    /*On delete the ddlist signal deletes the label so nothing left to do here*/
448

449
    lv_style_t * style_label = lv_obj_get_style(ext->ddlist.label);
450
    const lv_font_t * font = style_label->text.font;
451
    lv_coord_t font_h = lv_font_get_height(font);
452

453
    if(sign == LV_SIGNAL_DRAG_END) {
454
        /*If dragged then align the list to there be an element in the middle*/
455
        lv_coord_t label_y1 = ext->ddlist.label->coords.y1 - roller->coords.y1;
456
        lv_coord_t label_unit = font_h + style_label->text.line_space;
457
        lv_coord_t mid = (roller->coords.y2 - roller->coords.y1) / 2;
458
        id = (mid - label_y1 + style_label->text.line_space / 2) / label_unit;
459
        if(id < 0) id = 0;
460
        if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
461
        ext->ddlist.sel_opt_id = id;
462
        if(ext->ddlist.action) ext->ddlist.action(roller);
463
    } else if(sign == LV_SIGNAL_RELEASED) {
464
        /*If picked an option by clicking then set it*/
465
        if(!lv_indev_is_dragging(indev)) {
466
            lv_point_t p;
467
            lv_indev_get_point(indev, &p);
468
            p.y = p.y - ext->ddlist.label->coords.y1;
469
            id = p.y / (font_h + style_label->text.line_space);
470
            if(id < 0) id = 0;
471
            if(id >= ext->ddlist.option_cnt) id = ext->ddlist.option_cnt - 1;
472
            ext->ddlist.sel_opt_id = id;
473
            if(ext->ddlist.action) ext->ddlist.action(roller);
474
        }
475
    }
476

477
    /*Position the scrollable according to the new selected option*/
478
    if(id != -1) {
479
        refr_position(roller, true);
480
    }
481

482
    return res;
483
}
484

485
/**
486
 * Draw a rectangle which has gradient on its top and bottom
487
 * @param roller pointer to a roller object
488
 * @param mask pointer to the current mask (from the design function)
489
 */
490
static void draw_bg(lv_obj_t * roller, const lv_area_t * mask)
491
{
492
    lv_style_t * style = lv_roller_get_style(roller, LV_ROLLER_STYLE_BG);
493
    lv_area_t half_mask;
494
    lv_area_t half_roller;
495
    lv_coord_t h = lv_obj_get_height(roller);
496
    bool union_ok;
497
    lv_area_copy(&half_roller, &roller->coords);
498

499
    half_roller.x1 -= roller->ext_size; /*Add ext size too (e.g. because of shadow draw) */
500
    half_roller.x2 += roller->ext_size;
501
    half_roller.y1 -= roller->ext_size;
502
    half_roller.y2 = roller->coords.y1 + h / 2;
503

504
    union_ok = lv_area_intersect(&half_mask, &half_roller, mask);
505

506
    half_roller.x1 += roller->ext_size; /*Revert ext. size adding*/
507
    half_roller.x2 -= roller->ext_size;
508
    half_roller.y1 += roller->ext_size;
509
    half_roller.y2 += style->body.radius;
510

511
    if(union_ok) {
512
        lv_draw_rect(&half_roller, &half_mask, style, lv_obj_get_opa_scale(roller));
513
    }
514

515
    half_roller.x1 -= roller->ext_size; /*Add ext size too (e.g. because of shadow draw) */
516
    half_roller.x2 += roller->ext_size;
517
    half_roller.y2 = roller->coords.y2 + roller->ext_size;
518
    half_roller.y1 = roller->coords.y1 + h / 2;
519
    if((h & 0x1) == 0) half_roller.y1++;    /*With even height the pixels in the middle would be drawn twice*/
520

521
    union_ok = lv_area_intersect(&half_mask, &half_roller, mask);
522

523
    half_roller.x1 += roller->ext_size; /*Revert ext. size adding*/
524
    half_roller.x2 -= roller->ext_size;
525
    half_roller.y2 -= roller->ext_size;
526
    half_roller.y1 -= style->body.radius;
527

528
    if(union_ok) {
529
        lv_color_t main_tmp = style->body.main_color;
530
        lv_color_t grad_tmp = style->body.grad_color;
531

532
        style->body.main_color = grad_tmp;
533
        style->body.grad_color = main_tmp;
534
        lv_draw_rect(&half_roller, &half_mask, style, lv_obj_get_opa_scale(roller));
535
        style->body.main_color = main_tmp;
536
        style->body.grad_color = grad_tmp;
537
    }
538
}
539

540
/**
541
 * Refresh the position of the roller. It uses the id stored in: ext->ddlist.selected_option_id
542
 * @param roller pointer to a roller object
543
 * @param anim_en true: refresh with animation; false: without animation
544
 */
545
static void refr_position(lv_obj_t * roller, bool anim_en)
546
{
547
#if USE_LV_ANIMATION == 0
548
    anim_en = false;
549
#endif
550
    lv_obj_t * roller_scrl = lv_page_get_scrl(roller);
551
    lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller);
552
    lv_style_t * style_label = lv_obj_get_style(ext->ddlist.label);
553
    const lv_font_t * font = style_label->text.font;
554
    lv_coord_t font_h = lv_font_get_height(font);
555
    lv_coord_t h = lv_obj_get_height(roller);
556
    int32_t id = ext->ddlist.sel_opt_id;
557
    lv_coord_t line_y1 = id * (font_h + style_label->text.line_space) + ext->ddlist.label->coords.y1 - roller_scrl->coords.y1;
558
    lv_coord_t new_y = - line_y1 + (h - font_h) / 2;
559

560
    if(ext->ddlist.anim_time == 0 || anim_en == false) {
561
        lv_obj_set_y(roller_scrl, new_y);
562
    } else {
563
#if USE_LV_ANIMATION
564
        lv_anim_t a;
565
        a.var = roller_scrl;
566
        a.start = lv_obj_get_y(roller_scrl);
567
        a.end = new_y;
568
        a.fp = (lv_anim_fp_t)lv_obj_set_y;
569
        a.path = lv_anim_path_linear;
570
        a.end_cb = NULL;
571
        a.act_time = 0;
572
        a.time = ext->ddlist.anim_time;
573
        a.playback = 0;
574
        a.playback_pause = 0;
575
        a.repeat = 0;
576
        a.repeat_pause = 0;
577
        lv_anim_create(&a);
578
#endif
579
    }
580
}
581

582
#endif
583

584