gtkcenterbox.c 24.8 KB
Newer Older
Matthias Clasen's avatar
Matthias Clasen committed
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
/*
 * Copyright (c) 2017 Timm Bäder <mail@baedert.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Author: Timm Bäder <mail@baedert.org>
 */

/**
 * SECTION:gtkcenterbox
 * @Short_description: A centering container
 * @Title: GtkCenterBox
 * @See_also: #GtkBox
 *
 * The GtkCenterBox widget arranges three children in a horizontal
 * or vertical arrangement, keeping the middle child centered as well
 * as possible.
 *
 * To add children to GtkCenterBox, use gtk_center_box_set_start_widget(),
 * gtk_center_box_set_center_widget() and gtk_center_box_set_end_widget().
 *
34 35 36 37 38 39 40 41 42
 * The sizing and positioning of children can be influenced with the
 * align and expand properties of the children.
 *
 * # GtkCenterBox as GtkBuildable
 *
 * The GtkCenterBox implementation of the GtkBuildable interface supports
 * placing children in the 3 positions by specifying “start”, “center” or
 * “end” as the “type” attribute of a <child> element.
 *
Matthias Clasen's avatar
Matthias Clasen committed
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
 * # CSS nodes
 *
 * GtkCenterBox uses a single CSS node with name box.
 *
 * In horizontal orientation, the nodes of the children are always arranged
 * from left to right. So :first-child will always select the leftmost child,
 * regardless of text direction.
 *
 * In vertical orientation, the are arranged from top to bottom.
 */

#include "config.h"
#include "gtkcenterbox.h"
#include "gtkcssnodeprivate.h"
#include "gtkwidgetprivate.h"
58 59
#include "gtkorientable.h"
#include "gtkorientableprivate.h"
60
#include "gtkbuildable.h"
61
#include "gtksizerequest.h"
62 63 64
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkintl.h"
Matthias Clasen's avatar
Matthias Clasen committed
65 66 67 68 69 70 71 72 73

struct _GtkCenterBox
{
  GtkWidget parent_instance;

  GtkWidget *start_widget;
  GtkWidget *center_widget;
  GtkWidget *end_widget;

74
  GtkOrientation orientation;
75
  GtkBaselinePosition baseline_pos;
76
};
Matthias Clasen's avatar
Matthias Clasen committed
77 78 79 80 81

struct _GtkCenterBoxClass
{
  GtkWidgetClass parent_class;
};
82 83


84 85
enum {
  PROP_0,
86
  PROP_BASELINE_POSITION,
87 88 89
  PROP_ORIENTATION
};

90
static void gtk_center_box_buildable_init (GtkBuildableIface *iface);
91

92
G_DEFINE_TYPE_WITH_CODE (GtkCenterBox, gtk_center_box, GTK_TYPE_WIDGET,
93 94
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_center_box_buildable_init))
95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116

static void
gtk_center_box_buildable_add_child (GtkBuildable  *buildable,
                                    GtkBuilder    *builder,
                                    GObject       *child,
                                    const gchar   *type)
{
  if (g_strcmp0 (type, "start") == 0)
    gtk_center_box_set_start_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
  else if (g_strcmp0 (type, "center") == 0)
    gtk_center_box_set_center_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
  else if (g_strcmp0 (type, "end") == 0)
    gtk_center_box_set_end_widget (GTK_CENTER_BOX (buildable), GTK_WIDGET (child));
  else
    GTK_BUILDER_WARN_INVALID_CHILD_TYPE (GTK_CENTER_BOX (buildable), type);
}

static void
gtk_center_box_buildable_init (GtkBuildableIface *iface)
{
  iface->add_child = gtk_center_box_buildable_add_child;
}
117

118 119 120 121 122 123 124 125 126 127
static gboolean
get_expand (GtkWidget      *widget,
            GtkOrientation  orientation)
{
  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    return gtk_widget_get_hexpand (widget);
  else
    return gtk_widget_get_vexpand (widget);
}

128
static void
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147
gtk_center_box_distribute (GtkCenterBox     *self,
                           gint              for_size,
                           gint              size,
                           GtkRequestedSize *sizes)
{
  int center_size = 0;
  int start_size = 0;
  int end_size = 0;
  gboolean center_expand = FALSE;
  gboolean start_expand = FALSE;
  gboolean end_expand = FALSE;
  int avail;

  sizes[0].minimum_size = sizes[0].natural_size = 0;
  sizes[1].minimum_size = sizes[1].natural_size = 0;
  sizes[2].minimum_size = sizes[2].natural_size = 0;

  if (self->start_widget)
    gtk_widget_measure (self->start_widget,
148
                        self->orientation,
149 150 151 152 153 154
                        for_size,
                        &sizes[0].minimum_size, &sizes[0].natural_size,
                        NULL, NULL);

  if (self->center_widget)
    gtk_widget_measure (self->center_widget,
155
                        self->orientation,
156 157 158 159 160 161 162
                        for_size,
                        &sizes[1].minimum_size, &sizes[1].natural_size,
                        NULL, NULL);


  if (self->end_widget)
    gtk_widget_measure (self->end_widget,
163
                        self->orientation,
164 165 166 167 168 169 170
                        for_size,
                        &sizes[2].minimum_size, &sizes[2].natural_size,
                        NULL, NULL);

  if (self->center_widget)
    {
      center_size = CLAMP (size - (sizes[0].minimum_size + sizes[2].minimum_size), sizes[1].minimum_size, sizes[1].natural_size);
171
      center_expand = get_expand (self->center_widget, self->orientation);
172 173 174 175 176 177
    }

  if (self->start_widget)
    {
      avail = MIN ((size - center_size) / 2, size - (center_size + sizes[2].minimum_size));
      start_size = CLAMP (avail, sizes[0].minimum_size, sizes[0].natural_size);
178
      start_expand = get_expand (self->start_widget, self->orientation);
179 180 181 182 183 184
    }

  if (self->end_widget)
    {
      avail = MIN ((size - center_size) / 2, size - (center_size + sizes[0].minimum_size));
      end_size = CLAMP (avail, sizes[2].minimum_size, sizes[2].natural_size);
185
      end_expand = get_expand (self->end_widget, self->orientation);
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
    }

  if (self->center_widget)
    {
      int center_pos;

      center_pos = (size / 2) - (center_size / 2);

      /* Push in from start/end */
      if (start_size > center_pos)
        center_pos = start_size;
      else if (size - end_size < center_pos + center_size)
        center_pos = size - center_size - end_size;
      else if (center_expand)
        {
          center_size = size - 2 * MAX (start_size, end_size);
          center_pos = (size / 2) - (center_size / 2);
        }

      if (start_expand)
        start_size = center_pos;

      if (end_expand)
209
        end_size = size - (center_pos + center_size);
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
    }
  else
    {
      avail = size - (start_size + end_size);
      if (start_expand && end_expand)
        {
          start_size += avail / 2;
          end_size += avail / 2;
        }
      else if (start_expand)
        {
          start_size += avail;
        }
      else if (end_expand)
        {
          end_size += avail;
        }
    }

  sizes[0].minimum_size = start_size;
  sizes[1].minimum_size = center_size;
  sizes[2].minimum_size = end_size;
}

static void
gtk_center_box_measure_orientation (GtkWidget      *widget,
                                    GtkOrientation  orientation,
                                    int             for_size,
                                    int            *minimum,
                                    int            *natural,
                                    int            *minimum_baseline,
                                    int            *natural_baseline)
242 243
{
  GtkCenterBox *self = GTK_CENTER_BOX (widget);
244 245 246 247 248 249 250
  int min_baseline, nat_baseline;
  int start_min = 0;
  int start_nat = 0;
  int center_min = 0;
  int center_nat = 0;
  int end_min = 0;
  int end_nat = 0;
251

252
  if (self->start_widget)
253 254 255 256 257
    gtk_widget_measure (self->start_widget,
                        orientation,
                        for_size,
                        &start_min, &start_nat,
                        &min_baseline, &nat_baseline);
258

259
  if (self->center_widget)
260 261 262 263 264
    gtk_widget_measure (self->center_widget,
                        orientation,
                        for_size,
                        &center_min, &center_nat,
                        &min_baseline, &nat_baseline);
265 266

  if (self->end_widget)
267 268 269 270 271 272
    gtk_widget_measure (self->end_widget,
                        orientation,
                        for_size,
                        &end_min, &end_nat,
                        &min_baseline, &nat_baseline);

273 274 275 276 277 278 279 280 281 282 283 284 285 286
  *minimum = start_min + center_min + end_min;
  *natural = center_nat + 2 * MAX (start_nat, end_nat);
}

static void
gtk_center_box_measure_opposite (GtkWidget      *widget,
                                 GtkOrientation  orientation,
                                 int             for_size,
                                 int            *minimum,
                                 int            *natural,
                                 int            *minimum_baseline,
                                 int            *natural_baseline)
{
  GtkCenterBox *self = GTK_CENTER_BOX (widget);
287 288 289 290 291
  int child_min, child_nat;
  int child_min_baseline, child_nat_baseline;
  int total_min, above_min, below_min;
  int total_nat, above_nat, below_nat;
  GtkWidget *child[3];
292
  GtkRequestedSize sizes[3];
293 294 295 296 297
  int i;

  child[0] = self->start_widget;
  child[1] = self->center_widget;
  child[2] = self->end_widget;
298 299 300 301

  if (for_size >= 0)
    gtk_center_box_distribute (self, -1, for_size, sizes);

302 303
  above_min = below_min = above_nat = below_nat = -1;
  total_min = total_nat = 0;
304

305 306 307 308
  for (i = 0; i < 3; i++)
    {
      if (child[i] == NULL)
        continue;
309

310 311 312 313 314
      gtk_widget_measure (child[i],
                          orientation,
                          for_size >= 0 ? sizes[i].minimum_size : -1,
                          &child_min, &child_nat,
                          &child_min_baseline, &child_nat_baseline);
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
      if (child_min_baseline >= 0)
        {
          below_min = MAX (below_min, child_min - child_min_baseline);
          above_min = MAX (above_min, child_min_baseline);
          below_nat = MAX (below_nat, child_nat - child_nat_baseline);
          above_nat = MAX (above_nat, child_nat_baseline);
        }
      else
        {
          total_min = MAX (total_min, child_min);
          total_nat = MAX (total_nat, child_nat);
        }
   }

  if (above_min >= 0)
    {
      total_min = MAX (total_min, above_min + below_min);
      total_nat = MAX (total_nat, above_nat + below_nat);
      /* assume GTK_BASELINE_POSITION_CENTER for now */
      if (minimum_baseline)
        *minimum_baseline = above_min + (total_min - (above_min + below_min)) / 2;
      if (natural_baseline)
        *natural_baseline = above_nat + (total_nat - (above_nat + below_nat)) / 2;
    }

  *minimum = total_min;
  *natural = total_nat;
343 344 345 346 347 348 349 350 351 352 353
}

static void
gtk_center_box_measure (GtkWidget      *widget,
                        GtkOrientation  orientation,
                        int             for_size,
                        int            *minimum,
                        int            *natural,
                        int            *minimum_baseline,
                        int            *natural_baseline)
{
354 355 356
  GtkCenterBox *self = GTK_CENTER_BOX (widget);

  if (self->orientation == orientation)
357 358 359
    gtk_center_box_measure_orientation (widget, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline);
  else
    gtk_center_box_measure_opposite (widget, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline);
360 361 362 363 364 365 366 367 368 369
}

static void
gtk_center_box_size_allocate (GtkWidget     *widget,
                              GtkAllocation *allocation)
{
  GtkCenterBox *self = GTK_CENTER_BOX (widget);
  GtkAllocation child_allocation;
  GtkAllocation clip = *allocation;
  GtkAllocation child_clip;
370 371 372
  GtkWidget *child[3];
  int child_size[3];
  int child_pos[3];
373
  GtkRequestedSize sizes[3];
374 375
  int size;
  int for_size;
376 377
  int baseline;
  int i;
378 379 380

  GTK_WIDGET_CLASS (gtk_center_box_parent_class)->size_allocate (widget, allocation);

381 382 383 384
  if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      size = allocation->width;
      for_size = allocation->height;
385
      baseline = gtk_widget_get_allocated_baseline (widget);
386 387 388 389 390
    }
  else
    {
      size = allocation->height;
      for_size = allocation->width;
391
      baseline = -1;
392 393
    }

394 395
  /* Allocate child sizes */

396
  gtk_center_box_distribute (self, for_size, size, sizes);
397

398 399
  if (self->orientation == GTK_ORIENTATION_HORIZONTAL &&
      gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
400
    {
401 402 403 404 405 406
      child[0] = self->end_widget;
      child[1] = self->center_widget;
      child[2] = self->start_widget;
      child_size[0] = sizes[2].minimum_size;
      child_size[1] = sizes[1].minimum_size;
      child_size[2] = sizes[0].minimum_size;
407 408 409
    }
  else
    {
410 411 412 413 414 415
      child[0] = self->start_widget;
      child[1] = self->center_widget;
      child[2] = self->end_widget;
      child_size[0] = sizes[0].minimum_size;
      child_size[1] = sizes[1].minimum_size;
      child_size[2] = sizes[2].minimum_size;
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
  /* Determine baseline */
  if (self->orientation == GTK_ORIENTATION_HORIZONTAL &&
      baseline == -1)
    {
      int min_above, nat_above;
      int min_below, nat_below;
      gboolean have_baseline;

      have_baseline = FALSE;
      min_above = nat_above = 0;
      min_below = nat_below = 0;

      for (i = 0; i < 3; i++)
        {
          if (gtk_widget_get_valign (child[i]) == GTK_ALIGN_BASELINE)
            {
              int child_min_height, child_nat_height;
              int child_min_baseline, child_nat_baseline;

              child_min_baseline = child_nat_baseline = -1;

              gtk_widget_measure (child[i], GTK_ORIENTATION_VERTICAL,
                                  child_size[i],
                                  &child_min_height, &child_nat_height,
                                  &child_min_baseline, &child_nat_baseline);

              if (child_min_baseline >= 0)
                {
                  have_baseline = TRUE;
                  min_below = MAX (min_below, child_min_height - child_min_baseline);
                  nat_below = MAX (nat_below, child_nat_height - child_nat_baseline);
                  min_above = MAX (min_above, child_min_baseline);
                  nat_above = MAX (nat_above, child_nat_baseline);
                }
            }
        }

      if (have_baseline)
        {
          /* TODO: This is purely based on the minimum baseline.
           * When things fit we should use the natural one
           */
          switch (self->baseline_pos)
            {
            case GTK_BASELINE_POSITION_TOP:
              baseline = min_above;
              break;
            case GTK_BASELINE_POSITION_CENTER:
              baseline = min_above + (allocation->height - (min_above + min_below)) / 2;
              break;
            case GTK_BASELINE_POSITION_BOTTOM:
              baseline = allocation->height - min_below;
              break;
            }
        }
    }

  /* Allocate child positions */

477 478 479
  child_pos[0] = 0;
  child_pos[1] = (size / 2) - (child_size[1] / 2);
  child_pos[2] = size - child_size[2];
480

481
  if (child[1])
482 483
    {
      /* Push in from start/end */
484 485 486 487
      if (child_size[0] > child_pos[1])
        child_pos[1] = child_size[0];
      else if (size - child_size[2] < child_pos[1] + child_size[1])
        child_pos[1] = size - child_size[1] - child_size[2];
488 489
    }

490
  child_allocation = *allocation;
491

492
  for (i = 0; i < 3; i++)
493
    {
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510
      if (child[i] == NULL)
        continue;

      if (self->orientation == GTK_ORIENTATION_HORIZONTAL)
        {
          child_allocation.x = allocation->x + child_pos[i];
          child_allocation.y = allocation->y;
          child_allocation.width = child_size[i];
          child_allocation.height = allocation->height;
        }
      else
        {
          child_allocation.x = allocation->x;
          child_allocation.y = allocation->y + child_pos[i];
          child_allocation.width = allocation->width;
          child_allocation.height = child_size[i];
        }
511

512
      gtk_widget_size_allocate_with_baseline (child[i], &child_allocation, allocation->y + baseline);
513
      gtk_widget_get_clip (child[i], &child_clip);
514
      gdk_rectangle_union (&clip, &clip, &child_clip);
515 516 517 518 519 520 521 522 523 524 525
    }

  gtk_widget_set_clip (widget, &clip);
}

static void
gtk_center_box_snapshot (GtkWidget   *widget,
                         GtkSnapshot *snapshot)
{
  GtkCenterBox *self = GTK_CENTER_BOX (widget);

526 527
  if (self->start_widget)
    gtk_widget_snapshot_child (widget, self->start_widget, snapshot);
528 529 530 531

  if (self->center_widget)
    gtk_widget_snapshot_child (widget, self->center_widget, snapshot);

532 533
  if (self->end_widget)
    gtk_widget_snapshot_child (widget, self->end_widget, snapshot);
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
static void
update_css_node_order (GtkCenterBox *self)
{
  GtkCssNode *parent;
  GtkCssNode *first;
  GtkCssNode *last;

  parent = gtk_widget_get_css_node (GTK_WIDGET (self));

  if (gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_LTR)
    {
      first = self->start_widget ? gtk_widget_get_css_node (self->start_widget) : NULL;
      last = self->end_widget ? gtk_widget_get_css_node (self->end_widget) : NULL;
    }
  else
    {
      first = self->end_widget ? gtk_widget_get_css_node (self->end_widget) : NULL;
      last = self->start_widget ? gtk_widget_get_css_node (self->start_widget) : NULL;
    }

  if (first)
    gtk_css_node_insert_after (parent, first, NULL);
  if (last)
    gtk_css_node_insert_before (parent, last, NULL);
}

static void
gtk_center_box_direction_changed (GtkWidget        *widget,
                                  GtkTextDirection  previous_direction)
{
  update_css_node_order (GTK_CENTER_BOX (widget));
}

569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
static GtkSizeRequestMode
gtk_center_box_get_request_mode (GtkWidget *widget)
{
  GtkCenterBox *self = GTK_CENTER_BOX (widget);
  gint count[3] = { 0, 0, 0 };

  if (self->start_widget)
    count[gtk_widget_get_request_mode (self->start_widget)]++;

  if (self->center_widget)
    count[gtk_widget_get_request_mode (self->center_widget)]++;

  if (self->end_widget)
    count[gtk_widget_get_request_mode (self->end_widget)]++;

  if (!count[GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH] &&
      !count[GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT])
    return GTK_SIZE_REQUEST_CONSTANT_SIZE;
  else
    return count[GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT] > count[GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH]
           ? GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT
           : GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
}

593 594 595 596 597 598 599 600 601 602
static void
gtk_center_box_set_property (GObject      *object,
                             guint         prop_id,
                             const GValue *value,
                             GParamSpec   *pspec)
{
  GtkCenterBox *self = GTK_CENTER_BOX (object);

  switch (prop_id)
    {
603 604 605 606
    case PROP_BASELINE_POSITION:
      gtk_center_box_set_baseline_position (self, g_value_get_enum (value));
      break;

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
    case PROP_ORIENTATION:
      {
        GtkOrientation orientation = g_value_get_enum (value);
        if (self->orientation != orientation)
          {
            self->orientation = orientation;
            _gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
            gtk_widget_queue_resize (GTK_WIDGET (self));
            g_object_notify (object, "orientation");
          }
      }
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_center_box_get_property (GObject    *object,
                             guint       prop_id,
                             GValue     *value,
                             GParamSpec *pspec)
{
  GtkCenterBox *self = GTK_CENTER_BOX (object);

  switch (prop_id)
    {
636 637 638 639
    case PROP_BASELINE_POSITION:
      g_value_set_enum (value, self->baseline_pos);
      break;

640 641 642 643 644 645 646 647 648 649
    case PROP_ORIENTATION:
      g_value_set_enum (value, self->orientation);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

650 651 652
static void
gtk_center_box_class_init (GtkCenterBoxClass *klass)
{
653
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
654 655
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

656 657 658
  object_class->set_property = gtk_center_box_set_property;
  object_class->get_property = gtk_center_box_get_property;

659 660 661
  widget_class->measure = gtk_center_box_measure;
  widget_class->size_allocate = gtk_center_box_size_allocate;
  widget_class->snapshot = gtk_center_box_snapshot;
662
  widget_class->direction_changed = gtk_center_box_direction_changed;
663
  widget_class->get_request_mode = gtk_center_box_get_request_mode;
Matthias Clasen's avatar
Matthias Clasen committed
664

665 666
  g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");

667 668 669 670 671 672 673 674 675
  g_object_class_install_property (object_class, PROP_BASELINE_POSITION,
          g_param_spec_enum ("baseline-position",
                             P_("Baseline position"),
                             P_("The position of the baseline aligned widgets if extra space is available"),
                             GTK_TYPE_BASELINE_POSITION,
                             GTK_BASELINE_POSITION_CENTER,
                             GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));


Matthias Clasen's avatar
Matthias Clasen committed
676 677
  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_FILLER);
  gtk_widget_class_set_css_name (widget_class, "box");
678 679 680 681 682 683 684 685 686 687
}

static void
gtk_center_box_init (GtkCenterBox *self)
{
  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);

  self->start_widget = NULL;
  self->center_widget = NULL;
  self->end_widget = NULL;
688 689

  self->orientation = GTK_ORIENTATION_HORIZONTAL;
690
  self->baseline_pos = GTK_BASELINE_POSITION_CENTER;
691 692
}

Matthias Clasen's avatar
Matthias Clasen committed
693 694 695 696 697 698 699 700 701
/**
 * gtk_center_box_new:
 *
 * Creates a new #GtkCenterBox.
 *
 * Returns: the new #GtkCenterBox.
 *
 * Since: 3.92
 */
702 703 704 705 706 707
GtkWidget *
gtk_center_box_new (void)
{
  return GTK_WIDGET (g_object_new (GTK_TYPE_CENTER_BOX, NULL));
}

Matthias Clasen's avatar
Matthias Clasen committed
708 709 710 711 712 713 714 715 716
/**
 * gtk_center_box_set_start_widget:
 * @self: a #GtkCenterBox
 * @child: the child
 *
 * Sets the start widget.
 *
 * Since: 3.92
 */
717 718 719 720 721 722 723 724 725 726
void
gtk_center_box_set_start_widget (GtkCenterBox *self,
                                 GtkWidget    *child)
{
  if (self->start_widget)
    gtk_widget_unparent (self->start_widget);

  self->start_widget = child;
  if (child)
    gtk_widget_set_parent (child, GTK_WIDGET (self));
727 728

  update_css_node_order (self);
729 730
}

Matthias Clasen's avatar
Matthias Clasen committed
731 732 733 734 735 736 737 738 739
/**
 * gtk_center_box_set_center_widget:
 * @self: a #GtkCenterBox
 * @child: the child
 *
 * Sets the center widget.
 *
 * Since: 3.92
 */
740 741
void
gtk_center_box_set_center_widget (GtkCenterBox *self,
Matthias Clasen's avatar
Matthias Clasen committed
742
                                 GtkWidget     *child)
743 744 745 746 747 748 749
{
  if (self->center_widget)
    gtk_widget_unparent (self->center_widget);

  self->center_widget = child;
  if (child)
    gtk_widget_set_parent (child, GTK_WIDGET (self));
750 751

  update_css_node_order (self);
752 753
}

Matthias Clasen's avatar
Matthias Clasen committed
754 755 756 757 758 759 760 761 762
/**
 * gtk_center_box_set_end_widget:
 * @self: a #GtkCenterBox
 * @child: the child
 *
 * Sets the end widget.
 *
 * Since: 3.92
 */
763 764 765 766 767 768 769 770 771 772
void
gtk_center_box_set_end_widget (GtkCenterBox *self,
                               GtkWidget    *child)
{
  if (self->end_widget)
    gtk_widget_unparent (self->end_widget);

  self->end_widget = child;
  if (child)
    gtk_widget_set_parent (child, GTK_WIDGET (self));
773 774

  update_css_node_order (self);
775 776
}

Matthias Clasen's avatar
Matthias Clasen committed
777 778 779 780 781 782 783 784 785 786
/**
 * gtk_center_box_get_start_widget:
 * @self: a #GtkCenterBox
 *
 * Gets the start widget.
 *
 * Returns: the start widget.
 *
 * Since: 3.92
 */
787 788 789 790 791 792
GtkWidget *
gtk_center_box_get_start_widget (GtkCenterBox *self)
{
  return self->start_widget;
}

Matthias Clasen's avatar
Matthias Clasen committed
793 794 795 796 797 798 799 800 801 802
/**
 * gtk_center_box_get_center_widget:
 * @self: a #GtkCenterBox
 *
 * Gets the center widget.
 *
 * Returns: the center widget.
 *
 * Since: 3.92
 */
803 804 805 806 807 808
GtkWidget *
gtk_center_box_get_center_widget (GtkCenterBox *self)
{
  return self->center_widget;
}

Matthias Clasen's avatar
Matthias Clasen committed
809 810 811 812 813 814 815 816 817 818
/**
 * gtk_center_box_get_end_widget:
 * @self: a #GtkCenterBox
 *
 * Gets the end widget.
 *
 * Returns: the end widget.
 *
 * Since: 3.92
 */
819 820 821 822 823
GtkWidget *
gtk_center_box_get_end_widget (GtkCenterBox *self)
{
  return self->end_widget;
}
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

/**
 * gtk_center_box_set_baseline_position:
 * @self: a #GtkCenterBox
 * @position: a #GtkBaselinePosition
 *
 * Sets the baseline position of a center box.
 *
 * This affects only horizontal boxes with at least one baseline
 * aligned child. If there is more vertical space available than
 * requested, and the baseline is not allocated by the parent then
 * @position is used to allocate the baseline wrt. the extra space
 * available.
 *
 * Since: 3.92
 */
void
gtk_center_box_set_baseline_position (GtkCenterBox        *self,
                                      GtkBaselinePosition  position)
{
  g_return_if_fail (GTK_IS_CENTER_BOX (self));

  if (self->baseline_pos != position)
    {
      self->baseline_pos = position;
      g_object_notify (G_OBJECT (self), "baseline-position");
      gtk_widget_queue_resize (GTK_WIDGET (self));
    }
}

/**
 * gtk_center_box_get_baseline_position:
 * @self: a #GtkCenterBox
 *
 * Gets the value set by gtk_center_box_set_baseline_position().
 *
 * Returns: the baseline position
 *
 * Since: 3.92
 */
GtkBaselinePosition
gtk_center_box_get_baseline_position (GtkCenterBox *self)
{
  g_return_val_if_fail (GTK_IS_CENTER_BOX (self), GTK_BASELINE_POSITION_CENTER);

  return self->baseline_pos;
}