1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::Alignment;
use crate::AttrList;
use crate::Context;
#[cfg(any(feature = "v1_46", feature = "dox"))]
#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_46")))]
use crate::Direction;
use crate::EllipsizeMode;
use crate::FontDescription;
use crate::LayoutIter;
use crate::LayoutLine;
#[cfg(any(feature = "v1_50", feature = "dox"))]
#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
use crate::LayoutSerializeFlags;
use crate::Rectangle;
use crate::TabArray;
use crate::WrapMode;
use glib::translate::*;
use std::fmt;
use std::mem;
#[cfg(any(feature = "v1_50", feature = "dox"))]
#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
use std::ptr;

glib::wrapper! {
    /// A [`Layout`][crate::Layout] structure represents an entire paragraph of text.
    ///
    /// While complete access to the layout capabilities of Pango is provided
    /// using the detailed interfaces for itemization and shaping, using
    /// that functionality directly involves writing a fairly large amount
    /// of code. [`Layout`][crate::Layout] provides a high-level driver for formatting
    /// entire paragraphs of text at once. This includes paragraph-level
    /// functionality such as line breaking, justification, alignment and
    /// ellipsization.
    ///
    /// A [`Layout`][crate::Layout] is initialized with a [`Context`][crate::Context], UTF-8 string
    /// and set of attributes for that string. Once that is done, the set of
    /// formatted lines can be extracted from the object, the layout can be
    /// rendered, and conversion between logical character positions within
    /// the layout's text, and the physical position of the resulting glyphs
    /// can be made.
    ///
    /// There are a number of parameters to adjust the formatting of a
    /// [`Layout`][crate::Layout]. The following image shows adjustable parameters
    /// (on the left) and font metrics (on the right):
    ///
    /// <picture>
    ///   <source srcset="layout-dark.png" media="(prefers-color-scheme: dark)">
    ///   <img alt="Pango Layout Parameters" src="layout-light.png">
    /// </picture>
    ///
    /// The following images demonstrate the effect of alignment and
    /// justification on the layout of text:
    ///
    /// | | |
    /// | --- | --- |
    /// | ![align=left](align-left.png) | ![align=left, justify](align-left-justify.png) |
    /// | ![align=center](align-center.png) | ![align=center, justify](align-center-justify.png) |
    /// | ![align=right](align-right.png) | ![align=right, justify](align-right-justify.png) |
    ///
    ///
    /// It is possible, as well, to ignore the 2-D setup,
    /// and simply treat the results of a [`Layout`][crate::Layout] as a list of lines.
    #[doc(alias = "PangoLayout")]
    pub struct Layout(Object<ffi::PangoLayout, ffi::PangoLayoutClass>);

    match fn {
        type_ => || ffi::pango_layout_get_type(),
    }
}

impl Layout {
    /// Create a new [`Layout`][crate::Layout] object with attributes initialized to
    /// default values for a particular [`Context`][crate::Context].
    /// ## `context`
    /// a [`Context`][crate::Context]
    ///
    /// # Returns
    ///
    /// the newly allocated [`Layout`][crate::Layout]
    #[doc(alias = "pango_layout_new")]
    pub fn new(context: &Context) -> Layout {
        unsafe { from_glib_full(ffi::pango_layout_new(context.to_glib_none().0)) }
    }

    /// Forces recomputation of any state in the [`Layout`][crate::Layout] that
    /// might depend on the layout's context.
    ///
    /// This function should be called if you make changes to the context
    /// subsequent to creating the layout.
    #[doc(alias = "pango_layout_context_changed")]
    pub fn context_changed(&self) {
        unsafe {
            ffi::pango_layout_context_changed(self.to_glib_none().0);
        }
    }

    #[doc(alias = "pango_layout_copy")]
    #[must_use]
    pub fn copy(&self) -> Option<Layout> {
        unsafe { from_glib_full(ffi::pango_layout_copy(self.to_glib_none().0)) }
    }

    /// Gets the alignment for the layout: how partial lines are
    /// positioned within the horizontal space available.
    ///
    /// # Returns
    ///
    /// the alignment
    #[doc(alias = "pango_layout_get_alignment")]
    #[doc(alias = "get_alignment")]
    pub fn alignment(&self) -> Alignment {
        unsafe { from_glib(ffi::pango_layout_get_alignment(self.to_glib_none().0)) }
    }

    /// Gets the attribute list for the layout, if any.
    ///
    /// # Returns
    ///
    /// a [`AttrList`][crate::AttrList]
    #[doc(alias = "pango_layout_get_attributes")]
    #[doc(alias = "get_attributes")]
    pub fn attributes(&self) -> Option<AttrList> {
        unsafe { from_glib_none(ffi::pango_layout_get_attributes(self.to_glib_none().0)) }
    }

    /// Gets whether to calculate the base direction for the layout
    /// according to its contents.
    ///
    /// See [`set_auto_dir()`][Self::set_auto_dir()].
    ///
    /// # Returns
    ///
    /// [`true`] if the bidirectional base direction
    ///   is computed from the layout's contents, [`false`] otherwise
    #[doc(alias = "pango_layout_get_auto_dir")]
    #[doc(alias = "get_auto_dir")]
    pub fn is_auto_dir(&self) -> bool {
        unsafe { from_glib(ffi::pango_layout_get_auto_dir(self.to_glib_none().0)) }
    }

    /// Gets the Y position of baseline of the first line in @self.
    ///
    /// # Returns
    ///
    /// baseline of first line, from top of @self
    #[doc(alias = "pango_layout_get_baseline")]
    #[doc(alias = "get_baseline")]
    pub fn baseline(&self) -> i32 {
        unsafe { ffi::pango_layout_get_baseline(self.to_glib_none().0) }
    }

    /// Given an index within a layout, determines the positions that of the
    /// strong and weak cursors if the insertion point is at that index.
    ///
    /// This is a variant of [`cursor_pos()`][Self::cursor_pos()] that applies
    /// font metric information about caret slope and offset to the positions
    /// it returns.
    ///
    /// <picture>
    ///   <source srcset="caret-metrics-dark.png" media="(prefers-color-scheme: dark)">
    ///   <img alt="Caret metrics" src="caret-metrics-light.png">
    /// </picture>
    /// ## `index_`
    /// the byte index of the cursor
    ///
    /// # Returns
    ///
    ///
    /// ## `strong_pos`
    /// location to store the strong cursor position
    ///
    /// ## `weak_pos`
    /// location to store the weak cursor position
    #[cfg(any(feature = "v1_50", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
    #[doc(alias = "pango_layout_get_caret_pos")]
    #[doc(alias = "get_caret_pos")]
    pub fn caret_pos(&self, index_: i32) -> (Rectangle, Rectangle) {
        unsafe {
            let mut strong_pos = Rectangle::uninitialized();
            let mut weak_pos = Rectangle::uninitialized();
            ffi::pango_layout_get_caret_pos(
                self.to_glib_none().0,
                index_,
                strong_pos.to_glib_none_mut().0,
                weak_pos.to_glib_none_mut().0,
            );
            (strong_pos, weak_pos)
        }
    }

    /// Returns the number of Unicode characters in the
    /// the text of @self.
    ///
    /// # Returns
    ///
    /// the number of Unicode characters
    ///   in the text of @self
    #[doc(alias = "pango_layout_get_character_count")]
    #[doc(alias = "get_character_count")]
    pub fn character_count(&self) -> i32 {
        unsafe { ffi::pango_layout_get_character_count(self.to_glib_none().0) }
    }

    /// Retrieves the [`Context`][crate::Context] used for this layout.
    ///
    /// # Returns
    ///
    /// the [`Context`][crate::Context] for the layout
    #[doc(alias = "pango_layout_get_context")]
    #[doc(alias = "get_context")]
    pub fn context(&self) -> Option<Context> {
        unsafe { from_glib_none(ffi::pango_layout_get_context(self.to_glib_none().0)) }
    }

    /// Given an index within a layout, determines the positions that of the
    /// strong and weak cursors if the insertion point is at that index.
    ///
    /// The position of each cursor is stored as a zero-width rectangle
    /// with the height of the run extents.
    ///
    /// <picture>
    ///   <source srcset="cursor-positions-dark.png" media="(prefers-color-scheme: dark)">
    ///   <img alt="Cursor positions" src="cursor-positions-light.png">
    /// </picture>
    ///
    /// The strong cursor location is the location where characters of the
    /// directionality equal to the base direction of the layout are inserted.
    /// The weak cursor location is the location where characters of the
    /// directionality opposite to the base direction of the layout are inserted.
    ///
    /// The following example shows text with both a strong and a weak cursor.
    ///
    /// <picture>
    ///   <source srcset="split-cursor-dark.png" media="(prefers-color-scheme: dark)">
    ///   <img alt="Strong and weak cursors" src="split-cursor-light.png">
    /// </picture>
    ///
    /// The strong cursor has a little arrow pointing to the right, the weak
    /// cursor to the left. Typing a 'c' in this situation will insert the
    /// character after the 'b', and typing another Hebrew character, like 'ג',
    /// will insert it at the end.
    /// ## `index_`
    /// the byte index of the cursor
    ///
    /// # Returns
    ///
    ///
    /// ## `strong_pos`
    /// location to store the strong cursor position
    ///
    /// ## `weak_pos`
    /// location to store the weak cursor position
    #[doc(alias = "pango_layout_get_cursor_pos")]
    #[doc(alias = "get_cursor_pos")]
    pub fn cursor_pos(&self, index_: i32) -> (Rectangle, Rectangle) {
        unsafe {
            let mut strong_pos = Rectangle::uninitialized();
            let mut weak_pos = Rectangle::uninitialized();
            ffi::pango_layout_get_cursor_pos(
                self.to_glib_none().0,
                index_,
                strong_pos.to_glib_none_mut().0,
                weak_pos.to_glib_none_mut().0,
            );
            (strong_pos, weak_pos)
        }
    }

    /// Gets the text direction at the given character position in @self.
    /// ## `index`
    /// the byte index of the char
    ///
    /// # Returns
    ///
    /// the text direction at @index
    #[cfg(any(feature = "v1_46", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_46")))]
    #[doc(alias = "pango_layout_get_direction")]
    #[doc(alias = "get_direction")]
    pub fn direction(&self, index: i32) -> Direction {
        unsafe {
            from_glib(ffi::pango_layout_get_direction(
                self.to_glib_none().0,
                index,
            ))
        }
    }

    /// Gets the type of ellipsization being performed for @self.
    ///
    /// See [`set_ellipsize()`][Self::set_ellipsize()].
    ///
    /// Use [`is_ellipsized()`][Self::is_ellipsized()] to query whether any
    /// paragraphs were actually ellipsized.
    ///
    /// # Returns
    ///
    /// the current ellipsization mode for @self
    #[doc(alias = "pango_layout_get_ellipsize")]
    #[doc(alias = "get_ellipsize")]
    pub fn ellipsize(&self) -> EllipsizeMode {
        unsafe { from_glib(ffi::pango_layout_get_ellipsize(self.to_glib_none().0)) }
    }

    /// Computes the logical and ink extents of @self.
    ///
    /// Logical extents are usually what you want for positioning things. Note
    /// that both extents may have non-zero x and y. You may want to use those
    /// to offset where you render the layout. Not doing that is a very typical
    /// bug that shows up as right-to-left layouts not being correctly positioned
    /// in a layout with a set width.
    ///
    /// The extents are given in layout coordinates and in Pango units; layout
    /// coordinates begin at the top left corner of the layout.
    ///
    /// # Returns
    ///
    ///
    /// ## `ink_rect`
    /// rectangle used to store the extents of the
    ///   layout as drawn
    ///
    /// ## `logical_rect`
    /// rectangle used to store the logical
    ///   extents of the layout
    #[doc(alias = "pango_layout_get_extents")]
    #[doc(alias = "get_extents")]
    pub fn extents(&self) -> (Rectangle, Rectangle) {
        unsafe {
            let mut ink_rect = Rectangle::uninitialized();
            let mut logical_rect = Rectangle::uninitialized();
            ffi::pango_layout_get_extents(
                self.to_glib_none().0,
                ink_rect.to_glib_none_mut().0,
                logical_rect.to_glib_none_mut().0,
            );
            (ink_rect, logical_rect)
        }
    }

    /// Gets the font description for the layout, if any.
    ///
    /// # Returns
    ///
    /// a pointer to the
    ///   layout's font description, or [`None`] if the font description
    ///   from the layout's context is inherited.
    #[doc(alias = "pango_layout_get_font_description")]
    #[doc(alias = "get_font_description")]
    pub fn font_description(&self) -> Option<FontDescription> {
        unsafe {
            from_glib_none(ffi::pango_layout_get_font_description(
                self.to_glib_none().0,
            ))
        }
    }

    /// Gets the height of layout used for ellipsization.
    ///
    /// See [`set_height()`][Self::set_height()] for details.
    ///
    /// # Returns
    ///
    /// the height, in Pango units if positive,
    ///   or number of lines if negative.
    #[doc(alias = "pango_layout_get_height")]
    #[doc(alias = "get_height")]
    pub fn height(&self) -> i32 {
        unsafe { ffi::pango_layout_get_height(self.to_glib_none().0) }
    }

    /// Gets the paragraph indent width in Pango units.
    ///
    /// A negative value indicates a hanging indentation.
    ///
    /// # Returns
    ///
    /// the indent in Pango units
    #[doc(alias = "pango_layout_get_indent")]
    #[doc(alias = "get_indent")]
    pub fn indent(&self) -> i32 {
        unsafe { ffi::pango_layout_get_indent(self.to_glib_none().0) }
    }

    /// Returns an iterator to iterate over the visual extents of the layout.
    ///
    /// # Returns
    ///
    /// the new [`LayoutIter`][crate::LayoutIter]
    #[doc(alias = "pango_layout_get_iter")]
    #[doc(alias = "get_iter")]
    pub fn iter(&self) -> Option<LayoutIter> {
        unsafe { from_glib_full(ffi::pango_layout_get_iter(self.to_glib_none().0)) }
    }

    /// Gets whether each complete line should be stretched to fill the entire
    /// width of the layout.
    ///
    /// # Returns
    ///
    /// the justify value
    #[doc(alias = "pango_layout_get_justify")]
    #[doc(alias = "get_justify")]
    pub fn is_justify(&self) -> bool {
        unsafe { from_glib(ffi::pango_layout_get_justify(self.to_glib_none().0)) }
    }

    /// Gets whether the last line should be stretched
    /// to fill the entire width of the layout.
    ///
    /// # Returns
    ///
    /// the justify value
    #[cfg(any(feature = "v1_50", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
    #[doc(alias = "pango_layout_get_justify_last_line")]
    #[doc(alias = "get_justify_last_line")]
    pub fn is_justify_last_line(&self) -> bool {
        unsafe {
            from_glib(ffi::pango_layout_get_justify_last_line(
                self.to_glib_none().0,
            ))
        }
    }

    /// Retrieves a particular line from a [`Layout`][crate::Layout].
    ///
    /// Use the faster [`line_readonly()`][Self::line_readonly()] if you do not
    /// plan to modify the contents of the line (glyphs, glyph widths, etc.).
    /// ## `line`
    /// the index of a line, which must be between 0 and
    ///   `pango_layout_get_line_count(layout) - 1`, inclusive.
    ///
    /// # Returns
    ///
    /// the requested [`LayoutLine`][crate::LayoutLine],
    ///   or [`None`] if the index is out of range. This layout line can be ref'ed
    ///   and retained, but will become invalid if changes are made to the
    ///   [`Layout`][crate::Layout].
    #[doc(alias = "pango_layout_get_line")]
    #[doc(alias = "get_line")]
    pub fn line(&self, line: i32) -> Option<LayoutLine> {
        unsafe { from_glib_none(ffi::pango_layout_get_line(self.to_glib_none().0, line)) }
    }

    /// Retrieves the count of lines for the @self.
    ///
    /// # Returns
    ///
    /// the line count
    #[doc(alias = "pango_layout_get_line_count")]
    #[doc(alias = "get_line_count")]
    pub fn line_count(&self) -> i32 {
        unsafe { ffi::pango_layout_get_line_count(self.to_glib_none().0) }
    }

    /// Retrieves a particular line from a [`Layout`][crate::Layout].
    ///
    /// This is a faster alternative to [`line()`][Self::line()],
    /// but the user is not expected to modify the contents of the line
    /// (glyphs, glyph widths, etc.).
    /// ## `line`
    /// the index of a line, which must be between 0 and
    ///   `pango_layout_get_line_count(layout) - 1`, inclusive.
    ///
    /// # Returns
    ///
    /// the requested [`LayoutLine`][crate::LayoutLine],
    ///   or [`None`] if the index is out of range. This layout line can be ref'ed
    ///   and retained, but will become invalid if changes are made to the
    ///   [`Layout`][crate::Layout]. No changes should be made to the line.
    #[doc(alias = "pango_layout_get_line_readonly")]
    #[doc(alias = "get_line_readonly")]
    pub fn line_readonly(&self, line: i32) -> Option<LayoutLine> {
        unsafe {
            from_glib_none(ffi::pango_layout_get_line_readonly(
                self.to_glib_none().0,
                line,
            ))
        }
    }

    /// Gets the line spacing factor of @self.
    ///
    /// See [`set_line_spacing()`][Self::set_line_spacing()].
    #[cfg(any(feature = "v1_44", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_44")))]
    #[doc(alias = "pango_layout_get_line_spacing")]
    #[doc(alias = "get_line_spacing")]
    pub fn line_spacing(&self) -> f32 {
        unsafe { ffi::pango_layout_get_line_spacing(self.to_glib_none().0) }
    }

    /// Returns the lines of the @self as a list.
    ///
    /// Use the faster [`lines_readonly()`][Self::lines_readonly()] if you do not
    /// plan to modify the contents of the lines (glyphs, glyph widths, etc.).
    ///
    /// # Returns
    ///
    /// a `GSList`
    ///   containing the lines in the layout. This points to internal data of the
    ///   [`Layout`][crate::Layout] and must be used with care. It will become invalid on any
    ///   change to the layout's text or properties.
    #[doc(alias = "pango_layout_get_lines")]
    #[doc(alias = "get_lines")]
    pub fn lines(&self) -> Vec<LayoutLine> {
        unsafe {
            FromGlibPtrContainer::from_glib_none(ffi::pango_layout_get_lines(self.to_glib_none().0))
        }
    }

    /// Returns the lines of the @self as a list.
    ///
    /// This is a faster alternative to [`lines()`][Self::lines()],
    /// but the user is not expected to modify the contents of the lines
    /// (glyphs, glyph widths, etc.).
    ///
    /// # Returns
    ///
    /// a `GSList`
    ///   containing the lines in the layout. This points to internal data of the
    ///   [`Layout`][crate::Layout] and must be used with care. It will become invalid on any
    ///   change to the layout's text or properties. No changes should be made to
    ///   the lines.
    #[doc(alias = "pango_layout_get_lines_readonly")]
    #[doc(alias = "get_lines_readonly")]
    pub fn lines_readonly(&self) -> Vec<LayoutLine> {
        unsafe {
            FromGlibPtrContainer::from_glib_none(ffi::pango_layout_get_lines_readonly(
                self.to_glib_none().0,
            ))
        }
    }

    //#[doc(alias = "pango_layout_get_log_attrs")]
    //#[doc(alias = "get_log_attrs")]
    //pub fn log_attrs(&self, attrs: /*Ignored*/Vec<LogAttr>) -> i32 {
    //    unsafe { TODO: call ffi:pango_layout_get_log_attrs() }
    //}

    //#[doc(alias = "pango_layout_get_log_attrs_readonly")]
    //#[doc(alias = "get_log_attrs_readonly")]
    //pub fn log_attrs_readonly(&self) -> /*Ignored*/Vec<LogAttr> {
    //    unsafe { TODO: call ffi:pango_layout_get_log_attrs_readonly() }
    //}

    /// Computes the logical and ink extents of @self in device units.
    ///
    /// This function just calls [`extents()`][Self::extents()] followed by
    /// two [`extents_to_pixels()`][crate::extents_to_pixels()] calls, rounding @ink_rect and @logical_rect
    /// such that the rounded rectangles fully contain the unrounded one (that is,
    /// passes them as first argument to [`extents_to_pixels()`][crate::extents_to_pixels()]).
    ///
    /// # Returns
    ///
    ///
    /// ## `ink_rect`
    /// rectangle used to store the extents of the
    ///   layout as drawn
    ///
    /// ## `logical_rect`
    /// rectangle used to store the logical
    ///   extents of the layout
    #[doc(alias = "pango_layout_get_pixel_extents")]
    #[doc(alias = "get_pixel_extents")]
    pub fn pixel_extents(&self) -> (Rectangle, Rectangle) {
        unsafe {
            let mut ink_rect = Rectangle::uninitialized();
            let mut logical_rect = Rectangle::uninitialized();
            ffi::pango_layout_get_pixel_extents(
                self.to_glib_none().0,
                ink_rect.to_glib_none_mut().0,
                logical_rect.to_glib_none_mut().0,
            );
            (ink_rect, logical_rect)
        }
    }

    /// Determines the logical width and height of a [`Layout`][crate::Layout] in device
    /// units.
    ///
    /// [`size()`][Self::size()] returns the width and height
    /// scaled by `PANGO_SCALE`. This is simply a convenience function
    /// around [`pixel_extents()`][Self::pixel_extents()].
    ///
    /// # Returns
    ///
    ///
    /// ## `width`
    /// location to store the logical width
    ///
    /// ## `height`
    /// location to store the logical height
    #[doc(alias = "pango_layout_get_pixel_size")]
    #[doc(alias = "get_pixel_size")]
    pub fn pixel_size(&self) -> (i32, i32) {
        unsafe {
            let mut width = mem::MaybeUninit::uninit();
            let mut height = mem::MaybeUninit::uninit();
            ffi::pango_layout_get_pixel_size(
                self.to_glib_none().0,
                width.as_mut_ptr(),
                height.as_mut_ptr(),
            );
            let width = width.assume_init();
            let height = height.assume_init();
            (width, height)
        }
    }

    /// Returns the current serial number of @self.
    ///
    /// The serial number is initialized to an small number larger than zero
    /// when a new layout is created and is increased whenever the layout is
    /// changed using any of the setter functions, or the [`Context`][crate::Context] it
    /// uses has changed. The serial may wrap, but will never have the value 0.
    /// Since it can wrap, never compare it with "less than", always use "not equals".
    ///
    /// This can be used to automatically detect changes to a [`Layout`][crate::Layout],
    /// and is useful for example to decide whether a layout needs redrawing.
    /// To force the serial to be increased, use
    /// [`context_changed()`][Self::context_changed()].
    ///
    /// # Returns
    ///
    /// The current serial number of @self.
    #[doc(alias = "pango_layout_get_serial")]
    #[doc(alias = "get_serial")]
    pub fn serial(&self) -> u32 {
        unsafe { ffi::pango_layout_get_serial(self.to_glib_none().0) }
    }

    /// Obtains whether @self is in single paragraph mode.
    ///
    /// See [`set_single_paragraph_mode()`][Self::set_single_paragraph_mode()].
    ///
    /// # Returns
    ///
    /// [`true`] if the layout does not break paragraphs
    ///   at paragraph separator characters, [`false`] otherwise
    #[doc(alias = "pango_layout_get_single_paragraph_mode")]
    #[doc(alias = "get_single_paragraph_mode")]
    pub fn is_single_paragraph_mode(&self) -> bool {
        unsafe {
            from_glib(ffi::pango_layout_get_single_paragraph_mode(
                self.to_glib_none().0,
            ))
        }
    }

    /// Determines the logical width and height of a [`Layout`][crate::Layout] in Pango
    /// units.
    ///
    /// This is simply a convenience function around [`extents()`][Self::extents()].
    ///
    /// # Returns
    ///
    ///
    /// ## `width`
    /// location to store the logical width
    ///
    /// ## `height`
    /// location to store the logical height
    #[doc(alias = "pango_layout_get_size")]
    #[doc(alias = "get_size")]
    pub fn size(&self) -> (i32, i32) {
        unsafe {
            let mut width = mem::MaybeUninit::uninit();
            let mut height = mem::MaybeUninit::uninit();
            ffi::pango_layout_get_size(
                self.to_glib_none().0,
                width.as_mut_ptr(),
                height.as_mut_ptr(),
            );
            let width = width.assume_init();
            let height = height.assume_init();
            (width, height)
        }
    }

    /// Gets the amount of spacing between the lines of the layout.
    ///
    /// # Returns
    ///
    /// the spacing in Pango units
    #[doc(alias = "pango_layout_get_spacing")]
    #[doc(alias = "get_spacing")]
    pub fn spacing(&self) -> i32 {
        unsafe { ffi::pango_layout_get_spacing(self.to_glib_none().0) }
    }

    /// Gets the current [`TabArray`][crate::TabArray] used by this layout.
    ///
    /// If no [`TabArray`][crate::TabArray] has been set, then the default tabs are
    /// in use and [`None`] is returned. Default tabs are every 8 spaces.
    ///
    /// The return value should be freed with `Pango::TabArray::free()`.
    ///
    /// # Returns
    ///
    /// a copy of the tabs for this layout
    #[doc(alias = "pango_layout_get_tabs")]
    #[doc(alias = "get_tabs")]
    pub fn tabs(&self) -> Option<TabArray> {
        unsafe { from_glib_full(ffi::pango_layout_get_tabs(self.to_glib_none().0)) }
    }

    /// Gets the text in the layout.
    ///
    /// The returned text should not be freed or modified.
    ///
    /// # Returns
    ///
    /// the text in the @self
    #[doc(alias = "pango_layout_get_text")]
    #[doc(alias = "get_text")]
    pub fn text(&self) -> Option<glib::GString> {
        unsafe { from_glib_none(ffi::pango_layout_get_text(self.to_glib_none().0)) }
    }

    /// Counts the number of unknown glyphs in @self.
    ///
    /// This function can be used to determine if there are any fonts
    /// available to render all characters in a certain string, or when
    /// used in combination with [`AttrType::Fallback`][crate::AttrType::Fallback], to check if a
    /// certain font supports all the characters in the string.
    ///
    /// # Returns
    ///
    /// The number of unknown glyphs in @self
    #[doc(alias = "pango_layout_get_unknown_glyphs_count")]
    #[doc(alias = "get_unknown_glyphs_count")]
    pub fn unknown_glyphs_count(&self) -> i32 {
        unsafe { ffi::pango_layout_get_unknown_glyphs_count(self.to_glib_none().0) }
    }

    /// Gets the width to which the lines of the [`Layout`][crate::Layout] should wrap.
    ///
    /// # Returns
    ///
    /// the width in Pango units, or -1 if no width set.
    #[doc(alias = "pango_layout_get_width")]
    #[doc(alias = "get_width")]
    pub fn width(&self) -> i32 {
        unsafe { ffi::pango_layout_get_width(self.to_glib_none().0) }
    }

    /// Gets the wrap mode for the layout.
    ///
    /// Use [`is_wrapped()`][Self::is_wrapped()] to query whether
    /// any paragraphs were actually wrapped.
    ///
    /// # Returns
    ///
    /// active wrap mode.
    #[doc(alias = "pango_layout_get_wrap")]
    #[doc(alias = "get_wrap")]
    pub fn wrap(&self) -> WrapMode {
        unsafe { from_glib(ffi::pango_layout_get_wrap(self.to_glib_none().0)) }
    }

    /// Converts from byte @index_ within the @self to line and X position.
    ///
    /// The X position is measured from the left edge of the line.
    /// ## `index_`
    /// the byte index of a grapheme within the layout
    /// ## `trailing`
    /// an integer indicating the edge of the grapheme to retrieve the
    ///   position of. If > 0, the trailing edge of the grapheme, if 0,
    ///   the leading of the grapheme
    ///
    /// # Returns
    ///
    ///
    /// ## `line`
    /// location to store resulting line index. (which will
    ///   between 0 and pango_layout_get_line_count(layout) - 1)
    ///
    /// ## `x_pos`
    /// location to store resulting position within line
    ///   (`PANGO_SCALE` units per device unit)
    #[doc(alias = "pango_layout_index_to_line_x")]
    pub fn index_to_line_x(&self, index_: i32, trailing: bool) -> (i32, i32) {
        unsafe {
            let mut line = mem::MaybeUninit::uninit();
            let mut x_pos = mem::MaybeUninit::uninit();
            ffi::pango_layout_index_to_line_x(
                self.to_glib_none().0,
                index_,
                trailing.into_glib(),
                line.as_mut_ptr(),
                x_pos.as_mut_ptr(),
            );
            let line = line.assume_init();
            let x_pos = x_pos.assume_init();
            (line, x_pos)
        }
    }

    /// Converts from an index within a [`Layout`][crate::Layout] to the onscreen position
    /// corresponding to the grapheme at that index.
    ///
    /// The return value is represented as rectangle. Note that `pos->x` is
    /// always the leading edge of the grapheme and `pos->x + pos->width` the
    /// trailing edge of the grapheme. If the directionality of the grapheme
    /// is right-to-left, then `pos->width` will be negative.
    /// ## `index_`
    /// byte index within @self
    ///
    /// # Returns
    ///
    ///
    /// ## `pos`
    /// rectangle in which to store the position of the grapheme
    #[doc(alias = "pango_layout_index_to_pos")]
    pub fn index_to_pos(&self, index_: i32) -> Rectangle {
        unsafe {
            let mut pos = Rectangle::uninitialized();
            ffi::pango_layout_index_to_pos(self.to_glib_none().0, index_, pos.to_glib_none_mut().0);
            pos
        }
    }

    /// Queries whether the layout had to ellipsize any paragraphs.
    ///
    /// This returns [`true`] if the ellipsization mode for @self
    /// is not [`EllipsizeMode::None`][crate::EllipsizeMode::None], a positive width is set on @self,
    /// and there are paragraphs exceeding that width that have to be
    /// ellipsized.
    ///
    /// # Returns
    ///
    /// [`true`] if any paragraphs had to be ellipsized,
    ///   [`false`] otherwise
    #[doc(alias = "pango_layout_is_ellipsized")]
    pub fn is_ellipsized(&self) -> bool {
        unsafe { from_glib(ffi::pango_layout_is_ellipsized(self.to_glib_none().0)) }
    }

    /// Queries whether the layout had to wrap any paragraphs.
    ///
    /// This returns [`true`] if a positive width is set on @self,
    /// ellipsization mode of @self is set to [`EllipsizeMode::None`][crate::EllipsizeMode::None],
    /// and there are paragraphs exceeding the layout width that have
    /// to be wrapped.
    ///
    /// # Returns
    ///
    /// [`true`] if any paragraphs had to be wrapped, [`false`]
    ///   otherwise
    #[doc(alias = "pango_layout_is_wrapped")]
    pub fn is_wrapped(&self) -> bool {
        unsafe { from_glib(ffi::pango_layout_is_wrapped(self.to_glib_none().0)) }
    }

    /// Computes a new cursor position from an old position and a direction.
    ///
    /// If @direction is positive, then the new position will cause the strong
    /// or weak cursor to be displayed one position to right of where it was
    /// with the old cursor position. If @direction is negative, it will be
    /// moved to the left.
    ///
    /// In the presence of bidirectional text, the correspondence between
    /// logical and visual order will depend on the direction of the current
    /// run, and there may be jumps when the cursor is moved off of the end
    /// of a run.
    ///
    /// Motion here is in cursor positions, not in characters, so a single
    /// call to this function may move the cursor over multiple characters
    /// when multiple characters combine to form a single grapheme.
    /// ## `strong`
    /// whether the moving cursor is the strong cursor or the
    ///   weak cursor. The strong cursor is the cursor corresponding
    ///   to text insertion in the base direction for the layout.
    /// ## `old_index`
    /// the byte index of the current cursor position
    /// ## `old_trailing`
    /// if 0, the cursor was at the leading edge of the
    ///   grapheme indicated by @old_index, if > 0, the cursor
    ///   was at the trailing edge.
    /// ## `direction`
    /// direction to move cursor. A negative
    ///   value indicates motion to the left
    ///
    /// # Returns
    ///
    ///
    /// ## `new_index`
    /// location to store the new cursor byte index.
    ///   A value of -1 indicates that the cursor has been moved off the
    ///   beginning of the layout. A value of `G_MAXINT` indicates that
    ///   the cursor has been moved off the end of the layout.
    ///
    /// ## `new_trailing`
    /// number of characters to move forward from
    ///   the location returned for @new_index to get the position where
    ///   the cursor should be displayed. This allows distinguishing the
    ///   position at the beginning of one line from the position at the
    ///   end of the preceding line. @new_index is always on the line where
    ///   the cursor should be displayed.
    #[doc(alias = "pango_layout_move_cursor_visually")]
    pub fn move_cursor_visually(
        &self,
        strong: bool,
        old_index: i32,
        old_trailing: i32,
        direction: i32,
    ) -> (i32, i32) {
        unsafe {
            let mut new_index = mem::MaybeUninit::uninit();
            let mut new_trailing = mem::MaybeUninit::uninit();
            ffi::pango_layout_move_cursor_visually(
                self.to_glib_none().0,
                strong.into_glib(),
                old_index,
                old_trailing,
                direction,
                new_index.as_mut_ptr(),
                new_trailing.as_mut_ptr(),
            );
            let new_index = new_index.assume_init();
            let new_trailing = new_trailing.assume_init();
            (new_index, new_trailing)
        }
    }

    /// Serializes the @self for later deserialization via `Pango::Layout::deserialize()`.
    ///
    /// There are no guarantees about the format of the output across different
    /// versions of Pango and `Pango::Layout::deserialize()` will reject data
    /// that it cannot parse.
    ///
    /// The intended use of this function is testing, benchmarking and debugging.
    /// The format is not meant as a permanent storage format.
    /// ## `flags`
    /// [`LayoutSerializeFlags`][crate::LayoutSerializeFlags]
    ///
    /// # Returns
    ///
    /// a `GBytes` containing the serialized form of @self
    #[cfg(any(feature = "v1_50", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
    #[doc(alias = "pango_layout_serialize")]
    pub fn serialize(&self, flags: LayoutSerializeFlags) -> glib::Bytes {
        unsafe {
            from_glib_full(ffi::pango_layout_serialize(
                self.to_glib_none().0,
                flags.into_glib(),
            ))
        }
    }

    /// Sets the alignment for the layout: how partial lines are
    /// positioned within the horizontal space available.
    ///
    /// The default alignment is [`Alignment::Left`][crate::Alignment::Left].
    /// ## `alignment`
    /// the alignment
    #[doc(alias = "pango_layout_set_alignment")]
    pub fn set_alignment(&self, alignment: Alignment) {
        unsafe {
            ffi::pango_layout_set_alignment(self.to_glib_none().0, alignment.into_glib());
        }
    }

    /// Sets the text attributes for a layout object.
    ///
    /// References @attrs, so the caller can unref its reference.
    /// ## `attrs`
    /// a [`AttrList`][crate::AttrList]
    #[doc(alias = "pango_layout_set_attributes")]
    pub fn set_attributes(&self, attrs: Option<&AttrList>) {
        unsafe {
            ffi::pango_layout_set_attributes(self.to_glib_none().0, attrs.to_glib_none().0);
        }
    }

    /// Sets whether to calculate the base direction
    /// for the layout according to its contents.
    ///
    /// When this flag is on (the default), then paragraphs in @self that
    /// begin with strong right-to-left characters (Arabic and Hebrew principally),
    /// will have right-to-left layout, paragraphs with letters from other scripts
    /// will have left-to-right layout. Paragraphs with only neutral characters
    /// get their direction from the surrounding paragraphs.
    ///
    /// When [`false`], the choice between left-to-right and right-to-left
    /// layout is done according to the base direction of the layout's
    /// [`Context`][crate::Context]. (See [`Context::set_base_dir()`][crate::Context::set_base_dir()]).
    ///
    /// When the auto-computed direction of a paragraph differs from the
    /// base direction of the context, the interpretation of
    /// [`Alignment::Left`][crate::Alignment::Left] and [`Alignment::Right`][crate::Alignment::Right] are swapped.
    /// ## `auto_dir`
    /// if [`true`], compute the bidirectional base direction
    ///   from the layout's contents
    #[doc(alias = "pango_layout_set_auto_dir")]
    pub fn set_auto_dir(&self, auto_dir: bool) {
        unsafe {
            ffi::pango_layout_set_auto_dir(self.to_glib_none().0, auto_dir.into_glib());
        }
    }

    /// Sets the type of ellipsization being performed for @self.
    ///
    /// Depending on the ellipsization mode @ellipsize text is
    /// removed from the start, middle, or end of text so they
    /// fit within the width and height of layout set with
    /// [`set_width()`][Self::set_width()] and [`set_height()`][Self::set_height()].
    ///
    /// If the layout contains characters such as newlines that
    /// force it to be layed out in multiple paragraphs, then whether
    /// each paragraph is ellipsized separately or the entire layout
    /// is ellipsized as a whole depends on the set height of the layout.
    ///
    /// The default value is [`EllipsizeMode::None`][crate::EllipsizeMode::None].
    ///
    /// See [`set_height()`][Self::set_height()] for details.
    /// ## `ellipsize`
    /// the new ellipsization mode for @self
    #[doc(alias = "pango_layout_set_ellipsize")]
    pub fn set_ellipsize(&self, ellipsize: EllipsizeMode) {
        unsafe {
            ffi::pango_layout_set_ellipsize(self.to_glib_none().0, ellipsize.into_glib());
        }
    }

    /// Sets the default font description for the layout.
    ///
    /// If no font description is set on the layout, the
    /// font description from the layout's context is used.
    /// ## `desc`
    /// the new [`FontDescription`][crate::FontDescription]
    ///   to unset the current font description
    #[doc(alias = "pango_layout_set_font_description")]
    pub fn set_font_description(&self, desc: Option<&FontDescription>) {
        unsafe {
            ffi::pango_layout_set_font_description(self.to_glib_none().0, desc.to_glib_none().0);
        }
    }

    /// Sets the height to which the [`Layout`][crate::Layout] should be ellipsized at.
    ///
    /// There are two different behaviors, based on whether @height is positive
    /// or negative.
    ///
    /// If @height is positive, it will be the maximum height of the layout. Only
    /// lines would be shown that would fit, and if there is any text omitted,
    /// an ellipsis added. At least one line is included in each paragraph regardless
    /// of how small the height value is. A value of zero will render exactly one
    /// line for the entire layout.
    ///
    /// If @height is negative, it will be the (negative of) maximum number of lines
    /// per paragraph. That is, the total number of lines shown may well be more than
    /// this value if the layout contains multiple paragraphs of text.
    /// The default value of -1 means that the first line of each paragraph is ellipsized.
    /// This behavior may be changed in the future to act per layout instead of per
    /// paragraph. File a bug against pango at
    /// [https://gitlab.gnome.org/gnome/pango](https://gitlab.gnome.org/gnome/pango)
    /// if your code relies on this behavior.
    ///
    /// Height setting only has effect if a positive width is set on
    /// @self and ellipsization mode of @self is not [`EllipsizeMode::None`][crate::EllipsizeMode::None].
    /// The behavior is undefined if a height other than -1 is set and
    /// ellipsization mode is set to [`EllipsizeMode::None`][crate::EllipsizeMode::None], and may change in the
    /// future.
    /// ## `height`
    /// the desired height of the layout in Pango units if positive,
    ///   or desired number of lines if negative.
    #[doc(alias = "pango_layout_set_height")]
    pub fn set_height(&self, height: i32) {
        unsafe {
            ffi::pango_layout_set_height(self.to_glib_none().0, height);
        }
    }

    /// Sets the width in Pango units to indent each paragraph.
    ///
    /// A negative value of @indent will produce a hanging indentation.
    /// That is, the first line will have the full width, and subsequent
    /// lines will be indented by the absolute value of @indent.
    ///
    /// The indent setting is ignored if layout alignment is set to
    /// [`Alignment::Center`][crate::Alignment::Center].
    ///
    /// The default value is 0.
    /// ## `indent`
    /// the amount by which to indent
    #[doc(alias = "pango_layout_set_indent")]
    pub fn set_indent(&self, indent: i32) {
        unsafe {
            ffi::pango_layout_set_indent(self.to_glib_none().0, indent);
        }
    }

    /// Sets whether each complete line should be stretched to fill the
    /// entire width of the layout.
    ///
    /// Stretching is typically done by adding whitespace, but for some scripts
    /// (such as Arabic), the justification may be done in more complex ways,
    /// like extending the characters.
    ///
    /// Note that this setting is not implemented and so is ignored in
    /// Pango older than 1.18.
    ///
    /// Note that tabs and justification conflict with each other:
    /// Justification will move content away from its tab-aligned
    /// positions.
    ///
    /// The default value is [`false`].
    ///
    /// Also see [`set_justify_last_line()`][Self::set_justify_last_line()].
    /// ## `justify`
    /// whether the lines in the layout should be justified
    #[doc(alias = "pango_layout_set_justify")]
    pub fn set_justify(&self, justify: bool) {
        unsafe {
            ffi::pango_layout_set_justify(self.to_glib_none().0, justify.into_glib());
        }
    }

    /// Sets whether the last line should be stretched to fill the
    /// entire width of the layout.
    ///
    /// This only has an effect if [`set_justify()`][Self::set_justify()] has
    /// been called as well.
    ///
    /// The default value is [`false`].
    /// ## `justify`
    /// whether the last line in the layout should be justified
    #[cfg(any(feature = "v1_50", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
    #[doc(alias = "pango_layout_set_justify_last_line")]
    pub fn set_justify_last_line(&self, justify: bool) {
        unsafe {
            ffi::pango_layout_set_justify_last_line(self.to_glib_none().0, justify.into_glib());
        }
    }

    /// Sets a factor for line spacing.
    ///
    /// Typical values are: 0, 1, 1.5, 2. The default values is 0.
    ///
    /// If @factor is non-zero, lines are placed so that
    ///
    ///     baseline2 = baseline1 + factor * height2
    ///
    /// where height2 is the line height of the second line
    /// (as determined by the font(s)). In this case, the spacing
    /// set with [`set_spacing()`][Self::set_spacing()] is ignored.
    ///
    /// If @factor is zero (the default), spacing is applied as before.
    ///
    /// Note: for semantics that are closer to the CSS line-height
    /// property, see `attr_line_height_new()`.
    /// ## `factor`
    /// the new line spacing factor
    #[cfg(any(feature = "v1_44", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_44")))]
    #[doc(alias = "pango_layout_set_line_spacing")]
    pub fn set_line_spacing(&self, factor: f32) {
        unsafe {
            ffi::pango_layout_set_line_spacing(self.to_glib_none().0, factor);
        }
    }

    /// Sets the layout text and attribute list from marked-up text.
    ///
    /// See [Pango Markup](pango_markup.html)).
    ///
    /// Replaces the current text and attribute list.
    ///
    /// This is the same as [`set_markup_with_accel()`][Self::set_markup_with_accel()],
    /// but the markup text isn't scanned for accelerators.
    /// ## `markup`
    /// marked-up text
    /// ## `length`
    /// length of marked-up text in bytes, or -1 if @markup is
    ///   `NUL`-terminated
    #[doc(alias = "pango_layout_set_markup")]
    pub fn set_markup(&self, markup: &str) {
        let length = markup.len() as i32;
        unsafe {
            ffi::pango_layout_set_markup(self.to_glib_none().0, markup.to_glib_none().0, length);
        }
    }

    /// Sets the layout text and attribute list from marked-up text.
    ///
    /// See [Pango Markup](pango_markup.html)).
    ///
    /// Replaces the current text and attribute list.
    ///
    /// If @accel_marker is nonzero, the given character will mark the
    /// character following it as an accelerator. For example, @accel_marker
    /// might be an ampersand or underscore. All characters marked
    /// as an accelerator will receive a [`Underline::Low`][crate::Underline::Low] attribute,
    /// and the first character so marked will be returned in @accel_char.
    /// Two @accel_marker characters following each other produce a single
    /// literal @accel_marker character.
    /// ## `markup`
    /// marked-up text (see [Pango Markup](pango_markup.html))
    /// ## `length`
    /// length of marked-up text in bytes, or -1 if @markup is
    ///   `NUL`-terminated
    /// ## `accel_marker`
    /// marker for accelerators in the text
    ///
    /// # Returns
    ///
    ///
    /// ## `accel_char`
    /// return location
    ///   for first located accelerator
    #[doc(alias = "pango_layout_set_markup_with_accel")]
    pub fn set_markup_with_accel(&self, markup: &str, accel_marker: char) -> char {
        let length = markup.len() as i32;
        unsafe {
            let mut accel_char = mem::MaybeUninit::uninit();
            ffi::pango_layout_set_markup_with_accel(
                self.to_glib_none().0,
                markup.to_glib_none().0,
                length,
                accel_marker.into_glib(),
                accel_char.as_mut_ptr(),
            );
            let accel_char = accel_char.assume_init();
            std::convert::TryFrom::try_from(accel_char)
                .expect("conversion from an invalid Unicode value attempted")
        }
    }

    /// Sets the single paragraph mode of @self.
    ///
    /// If @setting is [`true`], do not treat newlines and similar characters
    /// as paragraph separators; instead, keep all text in a single paragraph,
    /// and display a glyph for paragraph separator characters. Used when
    /// you want to allow editing of newlines on a single text line.
    ///
    /// The default value is [`false`].
    /// ## `setting`
    /// new setting
    #[doc(alias = "pango_layout_set_single_paragraph_mode")]
    pub fn set_single_paragraph_mode(&self, setting: bool) {
        unsafe {
            ffi::pango_layout_set_single_paragraph_mode(self.to_glib_none().0, setting.into_glib());
        }
    }

    /// Sets the amount of spacing in Pango units between
    /// the lines of the layout.
    ///
    /// When placing lines with spacing, Pango arranges things so that
    ///
    ///     line2.top = line1.bottom + spacing
    ///
    /// The default value is 0.
    ///
    /// Note: Since 1.44, Pango is using the line height (as determined
    /// by the font) for placing lines when the line spacing factor is set
    /// to a non-zero value with [`set_line_spacing()`][Self::set_line_spacing()].
    /// In that case, the @spacing set with this function is ignored.
    ///
    /// Note: for semantics that are closer to the CSS line-height
    /// property, see `attr_line_height_new()`.
    /// ## `spacing`
    /// the amount of spacing
    #[doc(alias = "pango_layout_set_spacing")]
    pub fn set_spacing(&self, spacing: i32) {
        unsafe {
            ffi::pango_layout_set_spacing(self.to_glib_none().0, spacing);
        }
    }

    /// Sets the tabs to use for @self, overriding the default tabs.
    ///
    /// [`Layout`][crate::Layout] will place content at the next tab position
    /// whenever it meets a Tab character (U+0009).
    ///
    /// By default, tabs are every 8 spaces. If @tabs is [`None`], the
    /// default tabs are reinstated. @tabs is copied into the layout;
    /// you must free your copy of @tabs yourself.
    ///
    /// Note that tabs and justification conflict with each other:
    /// Justification will move content away from its tab-aligned
    /// positions. The same is true for alignments other than
    /// [`Alignment::Left`][crate::Alignment::Left].
    /// ## `tabs`
    /// a [`TabArray`][crate::TabArray]
    #[doc(alias = "pango_layout_set_tabs")]
    pub fn set_tabs(&self, tabs: Option<&TabArray>) {
        unsafe {
            ffi::pango_layout_set_tabs(self.to_glib_none().0, mut_override(tabs.to_glib_none().0));
        }
    }

    /// Sets the text of the layout.
    ///
    /// This function validates @text and renders invalid UTF-8
    /// with a placeholder glyph.
    ///
    /// Note that if you have used [`set_markup()`][Self::set_markup()] or
    /// [`set_markup_with_accel()`][Self::set_markup_with_accel()] on @self before, you
    /// may want to call [`set_attributes()`][Self::set_attributes()] to clear the
    /// attributes set on the layout from the markup as this function does
    /// not clear attributes.
    /// ## `text`
    /// the text
    /// ## `length`
    /// maximum length of @text, in bytes. -1 indicates that
    ///   the string is nul-terminated and the length should be calculated.
    ///   The text will also be truncated on encountering a nul-termination
    ///   even when @length is positive.
    #[doc(alias = "pango_layout_set_text")]
    pub fn set_text(&self, text: &str) {
        let length = text.len() as i32;
        unsafe {
            ffi::pango_layout_set_text(self.to_glib_none().0, text.to_glib_none().0, length);
        }
    }

    /// Sets the width to which the lines of the [`Layout`][crate::Layout] should wrap or
    /// ellipsized.
    ///
    /// The default value is -1: no width set.
    /// ## `width`
    /// the desired width in Pango units, or -1 to indicate that no
    ///   wrapping or ellipsization should be performed.
    #[doc(alias = "pango_layout_set_width")]
    pub fn set_width(&self, width: i32) {
        unsafe {
            ffi::pango_layout_set_width(self.to_glib_none().0, width);
        }
    }

    /// Sets the wrap mode.
    ///
    /// The wrap mode only has effect if a width is set on the layout
    /// with [`set_width()`][Self::set_width()]. To turn off wrapping,
    /// set the width to -1.
    ///
    /// The default value is [`WrapMode::Word`][crate::WrapMode::Word].
    /// ## `wrap`
    /// the wrap mode
    #[doc(alias = "pango_layout_set_wrap")]
    pub fn set_wrap(&self, wrap: WrapMode) {
        unsafe {
            ffi::pango_layout_set_wrap(self.to_glib_none().0, wrap.into_glib());
        }
    }

    /// A convenience method to serialize a layout to a file.
    ///
    /// It is equivalent to calling [`serialize()`][Self::serialize()]
    /// followed by `file_set_contents()`.
    ///
    /// See those two functions for details on the arguments.
    ///
    /// It is mostly intended for use inside a debugger to quickly dump
    /// a layout to a file for later inspection.
    /// ## `flags`
    /// [`LayoutSerializeFlags`][crate::LayoutSerializeFlags]
    /// ## `filename`
    /// the file to save it to
    ///
    /// # Returns
    ///
    /// [`true`] if saving was successful
    #[cfg(any(feature = "v1_50", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_50")))]
    #[doc(alias = "pango_layout_write_to_file")]
    pub fn write_to_file(
        &self,
        flags: LayoutSerializeFlags,
        filename: impl AsRef<std::path::Path>,
    ) -> Result<(), glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();
            let is_ok = ffi::pango_layout_write_to_file(
                self.to_glib_none().0,
                flags.into_glib(),
                filename.as_ref().to_glib_none().0,
                &mut error,
            );
            assert_eq!(is_ok == glib::ffi::GFALSE, !error.is_null());
            if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Converts from X and Y position within a layout to the byte index to the
    /// character at that logical position.
    ///
    /// If the Y position is not inside the layout, the closest position is
    /// chosen (the position will be clamped inside the layout). If the X position
    /// is not within the layout, then the start or the end of the line is
    /// chosen as described for [`LayoutLine::x_to_index()`][crate::LayoutLine::x_to_index()]. If either
    /// the X or Y positions were not inside the layout, then the function returns
    /// [`false`]; on an exact hit, it returns [`true`].
    /// ## `x`
    /// the X offset (in Pango units) from the left edge of the layout
    /// ## `y`
    /// the Y offset (in Pango units) from the top edge of the layout
    ///
    /// # Returns
    ///
    /// [`true`] if the coordinates were inside text, [`false`] otherwise
    ///
    /// ## `index_`
    /// location to store calculated byte index
    ///
    /// ## `trailing`
    /// location to store a integer indicating where
    ///   in the grapheme the user clicked. It will either be zero, or the
    ///   number of characters in the grapheme. 0 represents the leading edge
    ///   of the grapheme.
    #[doc(alias = "pango_layout_xy_to_index")]
    pub fn xy_to_index(&self, x: i32, y: i32) -> (bool, i32, i32) {
        unsafe {
            let mut index_ = mem::MaybeUninit::uninit();
            let mut trailing = mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::pango_layout_xy_to_index(
                self.to_glib_none().0,
                x,
                y,
                index_.as_mut_ptr(),
                trailing.as_mut_ptr(),
            ));
            let index_ = index_.assume_init();
            let trailing = trailing.assume_init();
            (ret, index_, trailing)
        }
    }
}

impl fmt::Display for Layout {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("Layout")
    }
}