gtklevelbar.c 45.9 KB
Newer Older
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
/* GTK - The GIMP Toolkit
 * Copyright © 2012 Red Hat, Inc.
 *
 * This library 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 library 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 library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Cosimo Cecchi <cosimoc@gnome.org>
 *
 */

/**
 * SECTION:gtklevelbar
 * @Title: GtkLevelBar
 * @Short_description: A bar that can used as a level indicator
 *
 * The #GtkLevelBar is a bar widget that can be used
 * as a level indicator. Typical use cases are displaying the strength
 * of a password, or showing the charge level of a battery.
 *
 * Use gtk_level_bar_set_value() to set the current value, and
 * gtk_level_bar_add_offset_value() to set the value offsets at which
32 33 34 35
 * the bar will be considered in a different state. GTK will add a few
 * offsets by default on the level bar: #GTK_LEVEL_BAR_OFFSET_LOW,
 * #GTK_LEVEL_BAR_OFFSET_HIGH and #GTK_LEVEL_BAR_OFFSET_FULL, with
 * values 0.25, 0.75 and 1.0 respectively.
36
 *
37 38 39 40
 * Note that it is your responsibility to update preexisting offsets
 * when changing the minimum or maximum value. GTK+ will simply clamp
 * them to the new range.
 *
41 42
 * ## Adding a custom offset on the bar
 *
43
 * |[<!-- language="C" -->
44 45 46 47
 *
 * static GtkWidget *
 * create_level_bar (void)
 * {
48 49
 *   GtkWidget *widget;
 *   GtkLevelBar *bar;
50
 *
51 52
 *   widget = gtk_level_bar_new ();
 *   bar = GTK_LEVEL_BAR (widget);
53
 *
54
 *   // This changes the value of the default low offset
55 56 57 58
 *
 *   gtk_level_bar_add_offset_value (bar,
 *                                   GTK_LEVEL_BAR_OFFSET_LOW,
 *                                   0.10);
59
 *
60
 *   // This adds a new offset to the bar; the application will
61
 *   // be able to change its color CSS like this:
62
 *   //
63 64
 *   // levelbar block.my-offset {
 *   //   background-color: magenta;
65 66 67 68
 *   //   border-style: solid;
 *   //   border-color: black;
 *   //   border-style: 1px;
 *   // }
69
 *
70 71 72
 *   gtk_level_bar_add_offset_value (bar, "my-offset", 0.60);
 *
 *   return widget;
73
 * }
74
 * ]|
75
 *
76
 * The default interval of values is between zero and one, but it’s possible to
77 78 79 80 81
 * modify the interval using gtk_level_bar_set_min_value() and
 * gtk_level_bar_set_max_value(). The value will be always drawn in proportion to
 * the admissible interval, i.e. a value of 15 with a specified interval between
 * 10 and 20 is equivalent to a value of 0.5 with an interval between 0 and 1.
 * When #GTK_LEVEL_BAR_MODE_DISCRETE is used, the bar level is rendered
82
 * as a finite number of separated blocks instead of a single one. The number
83 84
 * of blocks that will be rendered is equal to the number of units specified by
 * the admissible interval.
85
 *
86
 * For instance, to build a bar rendered with five blocks, it’s sufficient to
87 88 89
 * set the minimum value to 0 and the maximum value to 5 after changing the indicator
 * mode to discrete.
 *
90 91 92 93 94 95 96
 * GtkLevelBar was introduced in GTK+ 3.6.
 *
 * # GtkLevelBar as GtkBuildable
 *
 * The GtkLevelBar implementation of the GtkBuildable interface supports a
 * custom <offsets> element, which can contain any number of <offset> elements,
 * each of which must have name and value attributes.
97 98 99 100
 *
 * # CSS nodes
 *
 * |[<!-- language="plain" -->
101
 * levelbar[.discrete]
102
 * ╰── trough
103
 *     ├── block.filled.level-name
104 105 106
 *     ┊
 *     ├── block.empty
 *     ┊
107 108
 * ]|
 *
109 110 111 112 113
 * GtkLevelBar has a main CSS node with name levelbar and one of the style
 * classes .discrete or .continuous and a subnode with name trough. Below the
 * trough node are a number of nodes with name block and style class .filled
 * or .empty. In continuous mode, there is exactly one node of each, in discrete
 * mode, the number of filled and unfilled nodes corresponds to blocks that are
114
 * drawn. The block.filled nodes also get a style class .level-name corresponding
115
 * to the level for the current value.
116 117 118
 *
 * In horizontal orientation, the nodes are always arranged from left to right,
 * regardless of text direction.
119 120 121 122
 */
#include "config.h"

#include "gtkbuildable.h"
123
#include "gtkbuilderprivate.h"
124
#include "gtkcsscustomgadgetprivate.h"
125 126 127 128 129 130 131
#include "gtkintl.h"
#include "gtkorientableprivate.h"
#include "gtklevelbar.h"
#include "gtkmarshalers.h"
#include "gtkstylecontext.h"
#include "gtktypebuiltins.h"
#include "gtkwidget.h"
132
#include "gtkwidgetprivate.h"
133 134 135
#include "gtkstylecontextprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcssnodeprivate.h"
136 137 138 139

#include <math.h>
#include <stdlib.h>

140 141
#include "a11y/gtklevelbaraccessible.h"

142 143
#include "fallback-c89.c"

144 145 146 147 148 149 150
#define DEFAULT_BLOCK_SIZE 3

enum {
  PROP_VALUE = 1,
  PROP_MIN_VALUE,
  PROP_MAX_VALUE,
  PROP_MODE,
151
  PROP_INVERTED,
152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
  LAST_PROPERTY,
  PROP_ORIENTATION /* overridden */
};

enum {
  SIGNAL_OFFSET_CHANGED,
  NUM_SIGNALS
};

static GParamSpec *properties[LAST_PROPERTY] = { NULL, };
static guint signals[NUM_SIGNALS] = { 0, };

typedef struct {
  gchar *name;
  gdouble value;
} GtkLevelBarOffset;

struct _GtkLevelBarPrivate {
  GtkOrientation orientation;

172 173
  GtkLevelBarMode bar_mode;

174 175 176 177 178 179
  gdouble min_value;
  gdouble max_value;
  gdouble cur_value;

  GList *offsets;

180 181
  GtkCssGadget *trough_gadget;
  GtkCssGadget **block_gadget;
182
  guint n_blocks;
183

184
  guint inverted : 1;
185 186 187 188 189
};

static void gtk_level_bar_set_value_internal (GtkLevelBar *self,
                                              gdouble      value);

190 191 192 193 194 195 196 197
static void gtk_level_bar_buildable_init (GtkBuildableIface *iface);

G_DEFINE_TYPE_WITH_CODE (GtkLevelBar, gtk_level_bar, GTK_TYPE_WIDGET,
                         G_ADD_PRIVATE (GtkLevelBar)
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
                                                gtk_level_bar_buildable_init))

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
static GtkLevelBarOffset *
gtk_level_bar_offset_new (const gchar *name,
                          gdouble      value)
{
  GtkLevelBarOffset *offset = g_slice_new0 (GtkLevelBarOffset);

  offset->name = g_strdup (name);
  offset->value = value;

  return offset;
}

static void
gtk_level_bar_offset_free (GtkLevelBarOffset *offset)
{
  g_free (offset->name);
  g_slice_free (GtkLevelBarOffset, offset);
}

static gint
offset_find_func (gconstpointer data,
                  gconstpointer user_data)
{
  const GtkLevelBarOffset *offset = data;
  const gchar *name = user_data;

  return g_strcmp0 (name, offset->name);
}

static gint
offset_sort_func (gconstpointer a,
                  gconstpointer b)
{
  const GtkLevelBarOffset *offset_a = a;
  const GtkLevelBarOffset *offset_b = b;

  return (offset_a->value > offset_b->value);
}

static gboolean
gtk_level_bar_ensure_offset (GtkLevelBar *self,
                             const gchar *name,
                             gdouble      value)
{
  GList *existing;
  GtkLevelBarOffset *offset = NULL;
244
  GtkLevelBarOffset *new_offset;
245 246 247 248 249 250 251 252

  existing = g_list_find_custom (self->priv->offsets, name, offset_find_func);
  if (existing)
    offset = existing->data;

  if (offset && (offset->value == value))
    return FALSE;

253 254
  new_offset = gtk_level_bar_offset_new (name, value);

255 256 257 258 259 260
  if (offset)
    {
      gtk_level_bar_offset_free (offset);
      self->priv->offsets = g_list_delete_link (self->priv->offsets, existing);
    }

261
  self->priv->offsets = g_list_insert_sorted (self->priv->offsets, new_offset, offset_sort_func);
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284

  return TRUE;
}

static gboolean
gtk_level_bar_value_in_interval (GtkLevelBar *self,
                                 gdouble      value)
{
  return ((value >= self->priv->min_value) &&
          (value <= self->priv->max_value));
}

static gint
gtk_level_bar_get_num_blocks (GtkLevelBar *self)
{
  if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    return 1;
  else if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
    return MAX (1, (gint) (round (self->priv->max_value) - round (self->priv->min_value)));

  return 0;
}

285 286 287 288 289 290 291 292 293
static gint
gtk_level_bar_get_num_block_nodes (GtkLevelBar *self)
{
  if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    return 2;
  else
    return gtk_level_bar_get_num_blocks (self);
}

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
static void
gtk_level_bar_get_min_block_size (GtkLevelBar *self,
                                  gint        *block_width,
                                  gint        *block_height)
{
  guint i, n_blocks;
  gint width, height;

  *block_width = *block_height = 0;
  n_blocks = gtk_level_bar_get_num_block_nodes (self);

  for (i = 0; i < n_blocks; i++)
    {
      gtk_css_gadget_get_preferred_size (self->priv->block_gadget[i],
                                         GTK_ORIENTATION_HORIZONTAL,
                                         -1,
                                         &width, NULL,
                                         NULL, NULL);
      gtk_css_gadget_get_preferred_size (self->priv->block_gadget[i],
                                         GTK_ORIENTATION_VERTICAL,
                                         -1,
                                         &height, NULL,
                                         NULL, NULL);

      *block_width = MAX (width, *block_width);
      *block_height = MAX (height, *block_height);
    }
}

323 324 325 326 327 328 329 330 331 332
static gboolean
gtk_level_bar_get_real_inverted (GtkLevelBar *self)
{
  if (gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL &&
      self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    return !self->priv->inverted;

  return self->priv->inverted;
}

333
static void
334 335
gtk_level_bar_draw_fill_continuous (GtkLevelBar *self,
                                    cairo_t     *cr)
336
{
337 338
  gboolean inverted;

339
  inverted = gtk_level_bar_get_real_inverted (self);
340

341
  /* render the empty (unfilled) part */
342
  gtk_css_gadget_draw (self->priv->block_gadget[inverted ? 0 : 1], cr);
343 344

  /* now render the filled part on top of it */
345 346
  if (self->priv->cur_value != 0)
    gtk_css_gadget_draw (self->priv->block_gadget[inverted ? 1 : 0], cr);
347
}
348

349 350 351 352 353
static void
gtk_level_bar_draw_fill_discrete (GtkLevelBar *self,
                                  cairo_t     *cr)
{
  gint num_blocks, i;
354

355
  num_blocks = gtk_level_bar_get_num_blocks (self);
356

357 358 359
  for (i = 0; i < num_blocks; i++)
    gtk_css_gadget_draw (self->priv->block_gadget[i], cr);
}
360

361 362 363 364 365 366 367 368 369 370 371 372 373 374
static gboolean
gtk_level_bar_render_trough (GtkCssGadget *gadget,
                             cairo_t      *cr,
                             int           x,
                             int           y,
                             int           width,
                             int           height,
                             gpointer      data)
{
  GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);

  if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    gtk_level_bar_draw_fill_continuous (self, cr);
375
  else
376
    gtk_level_bar_draw_fill_discrete (self, cr);
377

378 379
  return FALSE;
}
380

381 382 383 384 385
static gboolean
gtk_level_bar_draw (GtkWidget *widget,
                    cairo_t   *cr)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
386

387
  gtk_css_gadget_draw (self->priv->trough_gadget, cr);
388

389
  return FALSE;
390 391 392
}

static void
393 394 395 396 397 398 399 400
gtk_level_bar_measure_trough (GtkCssGadget   *gadget,
                              GtkOrientation  orientation,
                              int             for_size,
                              int            *minimum,
                              int            *natural,
                              int            *minimum_baseline,
                              int            *natural_baseline,
                              gpointer        data)
401
{
402 403 404
  GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
  gint num_blocks, size;
405 406
  gint block_width, block_height;

407
  num_blocks = gtk_level_bar_get_num_blocks (self);
408 409
  gtk_level_bar_get_min_block_size (self, &block_width, &block_height);

410
  if (orientation == GTK_ORIENTATION_HORIZONTAL)
411
    {
412 413 414 415
      if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
        size = num_blocks * block_width;
      else
        size = block_width;
416 417 418
    }
  else
    {
419 420
      if (self->priv->orientation == GTK_ORIENTATION_VERTICAL)
        size = num_blocks * block_height;
421
      else
422
        size = block_height;
423
    }
424 425 426

  *minimum = size;
  *natural = size;
427 428 429
}

static void
430 431 432
gtk_level_bar_get_preferred_width (GtkWidget *widget,
                                   gint      *minimum,
                                   gint      *natural)
433
{
434 435 436 437 438 439
  gtk_css_gadget_get_preferred_size (GTK_LEVEL_BAR (widget)->priv->trough_gadget,
                                     GTK_ORIENTATION_HORIZONTAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
}
440

441 442 443 444 445 446 447 448 449 450
static void
gtk_level_bar_get_preferred_height (GtkWidget *widget,
                                    gint      *minimum,
                                    gint      *natural)
{
  gtk_css_gadget_get_preferred_size (GTK_LEVEL_BAR (widget)->priv->trough_gadget,
                                     GTK_ORIENTATION_VERTICAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
451 452
}

453 454 455 456 457
static void
gtk_level_bar_allocate_trough_continuous (GtkLevelBar *self,
                                          const GtkAllocation *allocation,
                                          int baseline,
                                          GtkAllocation *out_clip)
458
{
459 460 461
  GtkAllocation block_area, clip;
  gdouble fill_percentage;
  gboolean inverted;
462
  int block_min;
463

464
  inverted = gtk_level_bar_get_real_inverted (self);
465

466 467
  /* allocate the empty (unfilled) part */
  gtk_css_gadget_allocate (self->priv->block_gadget[inverted ? 0 : 1],
468
                           allocation,
469 470
                           baseline,
                           out_clip);
471

472 473 474
  if (self->priv->cur_value == 0)
    return;

475 476 477 478
  /* now allocate the filled part */
  block_area = *allocation;
  fill_percentage = (self->priv->cur_value - self->priv->min_value) /
    (self->priv->max_value - self->priv->min_value);
479

480 481 482 483 484
  gtk_css_gadget_get_preferred_size (self->priv->block_gadget[inverted ? 1 : 0],
                                     self->priv->orientation, -1,
                                     &block_min, NULL,
                                     NULL, NULL);

485 486 487
  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      block_area.width = (gint) floor (block_area.width * fill_percentage);
488
      block_area.width = MAX (block_area.width, block_min);
489

490 491 492 493 494 495
      if (inverted)
        block_area.x += allocation->width - block_area.width;
    }
  else
    {
      block_area.height = (gint) floor (block_area.height * fill_percentage);
496
      block_area.height = MAX (block_area.height, block_min);
497

498 499 500 501 502 503 504 505 506
      if (inverted)
        block_area.y += allocation->height - block_area.height;
    }

  gtk_css_gadget_allocate (self->priv->block_gadget[inverted ? 1 : 0],
                           &block_area,
                           baseline,
                           &clip);
  gdk_rectangle_intersect (out_clip, &clip, out_clip);
507 508 509
}

static void
510 511 512 513
gtk_level_bar_allocate_trough_discrete (GtkLevelBar *self,
                                        const GtkAllocation *allocation,
                                        int baseline,
                                        GtkAllocation *out_clip)
514
{
515 516 517
  GtkAllocation block_area, clip;
  gint num_blocks, i;
  gint block_width, block_height;
518

519
  gtk_level_bar_get_min_block_size (self, &block_width, &block_height);
520 521
  num_blocks = gtk_level_bar_get_num_blocks (self);

522 523 524
  if (num_blocks == 0)
    return;

525
  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
526 527 528 529
    {
      block_width = MAX (block_width, (gint) floor (allocation->width / num_blocks));
      block_height = allocation->height;
    }
530
  else
531 532 533 534
    {
      block_width = allocation->width;
      block_height = MAX (block_height, (gint) floor (allocation->height / num_blocks));
    }
535 536 537 538 539

  block_area.x = allocation->x;
  block_area.y = allocation->y;
  block_area.width = block_width;
  block_area.height = block_height;
540

541 542 543 544 545 546 547 548 549 550 551 552 553
  for (i = 0; i < num_blocks; i++)
    {
      gtk_css_gadget_allocate (self->priv->block_gadget[i],
                               &block_area,
                               baseline,
                               &clip);
      gdk_rectangle_intersect (out_clip, &clip, out_clip);

      if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
        block_area.x += block_area.width;
      else
        block_area.y += block_area.height;
    }
554 555 556
}

static void
557 558 559 560 561
gtk_level_bar_allocate_trough (GtkCssGadget        *gadget,
                               const GtkAllocation *allocation,
                               int                  baseline,
                               GtkAllocation       *out_clip,
                               gpointer             data)
562
{
563
  GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
564 565
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);

566 567
  if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    gtk_level_bar_allocate_trough_continuous (self, allocation, baseline, out_clip);
568
  else
569
    gtk_level_bar_allocate_trough_discrete (self, allocation, baseline, out_clip);
570 571
}

572 573 574 575
static void
gtk_level_bar_size_allocate (GtkWidget     *widget,
                             GtkAllocation *allocation)
{
576 577
  GtkAllocation clip;

578 579
  GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->size_allocate (widget, allocation);

580 581 582 583
  gtk_css_gadget_allocate (GTK_LEVEL_BAR (widget)->priv->trough_gadget,
                           allocation,
                           gtk_widget_get_allocated_baseline (widget),
                           &clip);
584

585
  gtk_widget_set_clip (widget, &clip);
586 587 588 589 590 591
}

static void
update_block_nodes (GtkLevelBar *self)
{
  GtkLevelBarPrivate *priv = self->priv;
592
  GtkCssNode *trough_node = gtk_css_gadget_get_node (priv->trough_gadget);
593 594 595
  guint n_blocks;
  guint i;

596
  n_blocks = gtk_level_bar_get_num_block_nodes (self);
597 598 599 600 601 602

  if (priv->n_blocks == n_blocks)
    return;
  else if (n_blocks < priv->n_blocks)
    {
      for (i = n_blocks; i < priv->n_blocks; i++)
603 604 605 606
        {
          gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->block_gadget[i]), NULL);
          g_clear_object (&priv->block_gadget[i]);
        }
607
      priv->block_gadget = g_renew (GtkCssGadget*, priv->block_gadget, n_blocks);
608 609 610 611
      priv->n_blocks = n_blocks;
    }
  else
    {
612
      priv->block_gadget = g_renew (GtkCssGadget*, priv->block_gadget, n_blocks);
613 614
      for (i = priv->n_blocks; i < n_blocks; i++)
        {
615 616 617 618 619 620
          priv->block_gadget[i] = gtk_css_custom_gadget_new ("block",
                                                             GTK_WIDGET (self),
                                                             priv->trough_gadget,
                                                             NULL,
                                                             NULL, NULL, NULL,
                                                             NULL, NULL);
621
          gtk_css_gadget_set_state (priv->block_gadget[i], gtk_css_node_get_state (trough_node));
622 623 624 625 626 627 628
        }
      priv->n_blocks = n_blocks;
    }
}

static void
update_mode_style_classes (GtkLevelBar *self)
629
{
630
  GtkLevelBarPrivate *priv = self->priv;
631
  GtkCssNode *widget_node;
632

633
  widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
634
  if (priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
635
    {
636 637
      gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("discrete"));
      gtk_css_node_add_class (widget_node, g_quark_from_static_string ("continuous"));
638
    }
639
  else if (priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
640
    {
641 642
      gtk_css_node_add_class (widget_node, g_quark_from_static_string ("discrete"));
      gtk_css_node_remove_class (widget_node, g_quark_from_static_string ("continuous"));
643 644 645
    }
}

646 647 648 649 650 651 652
static void
gtk_level_bar_state_flags_changed (GtkWidget     *widget,
                                   GtkStateFlags  previous_state)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
  GtkLevelBarPrivate *priv = self->priv;
  GtkStateFlags state;
653
  gint i;
654 655 656

  state = gtk_widget_get_state_flags (widget);

657
  gtk_css_gadget_set_state (priv->trough_gadget, state);
658
  for (i = 0; i < priv->n_blocks; i++)
659
    gtk_css_gadget_set_state (priv->block_gadget[i], state);
660 661

  GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->state_flags_changed (widget, previous_state);
662 663
}

664
static void
665
update_level_style_classes (GtkLevelBar *self)
666
{
667
  GtkLevelBarPrivate *priv = self->priv;
668
  gdouble value;
669
  const gchar *classes[3] = { NULL, NULL, NULL };
670
  const gchar *value_class = NULL;
671 672
  GtkLevelBarOffset *offset, *prev_offset;
  GList *l;
673 674
  gint num_filled, num_blocks, i;
  gboolean inverted;
675

676 677
  value = gtk_level_bar_get_value (self);

678
  for (l = priv->offsets; l != NULL; l = l->next)
679 680 681 682
    {
      offset = l->data;

      /* find the right offset for our style class */
683
      if (value <= offset->value)
684
        {
685 686 687 688 689 690 691 692 693 694
          if (l->prev == NULL)
            {
              value_class = offset->name;
            }
          else
            {
              prev_offset = l->prev->data;
              if (prev_offset->value < value)
                value_class = offset->name;
            }
695 696 697 698 699 700
        }

      if (value_class)
        break;
    }

701 702
  inverted = gtk_level_bar_get_real_inverted (self);
  num_blocks = gtk_level_bar_get_num_block_nodes (self);
703

704 705 706 707
  if (priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    num_filled = 1;
  else
    num_filled = MIN (num_blocks, (gint) round (priv->cur_value) - (gint) round (priv->min_value));
Cosimo Cecchi's avatar
Cosimo Cecchi committed
708

709 710 711 712
  classes[0] = "filled";
  classes[1] = value_class;
  for (i = 0; i < num_filled; i++)
    gtk_css_node_set_classes (gtk_css_gadget_get_node (priv->block_gadget[inverted ? num_blocks - 1 - i : i]), classes);
713

714 715 716 717
  classes[0] = "empty";
  classes[1] = NULL;
  for (; i < num_blocks; i++)
    gtk_css_node_set_classes (gtk_css_gadget_get_node (priv->block_gadget[inverted ? num_blocks - 1 - i : i]), classes);
718 719
}

720 721 722 723 724 725 726 727 728 729 730
static void
gtk_level_bar_direction_changed (GtkWidget        *widget,
                                 GtkTextDirection  previous_dir)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);

  update_level_style_classes (self);

  GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->direction_changed (widget, previous_dir);
}

731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
static void
gtk_level_bar_ensure_offsets_in_range (GtkLevelBar *self)
{
  GtkLevelBarOffset *offset;
  GList *l = self->priv->offsets;

  while (l != NULL)
    {
      offset = l->data;
      l = l->next;

      if (offset->value < self->priv->min_value)
        gtk_level_bar_ensure_offset (self, offset->name, self->priv->min_value);
      else if (offset->value > self->priv->max_value)
        gtk_level_bar_ensure_offset (self, offset->name, self->priv->max_value);
    }
}

typedef struct {
  GtkLevelBar *self;
751
  GtkBuilder *builder;
752 753 754 755 756 757 758 759 760 761 762
  GList *offsets;
} OffsetsParserData;

static void
offset_start_element (GMarkupParseContext  *context,
                      const gchar          *element_name,
                      const gchar         **names,
                      const gchar         **values,
                      gpointer              user_data,
                      GError              **error)
{
763
  OffsetsParserData *data = user_data;
764 765

  if (strcmp (element_name, "offsets") == 0)
766 767 768 769 770 771 772 773 774
    {
      if (!_gtk_builder_check_parent (data->builder, context, "object", error))
        return;

      if (!g_markup_collect_attributes (element_name, names, values, error,
                                        G_MARKUP_COLLECT_INVALID, NULL, NULL,
                                        G_MARKUP_COLLECT_INVALID))
        _gtk_builder_prefix_error (data->builder, context, error);
    }
775 776
  else if (strcmp (element_name, "offset") == 0)
    {
777 778 779 780 781 782 783 784 785 786 787 788
      const gchar *name;
      const gchar *value;
      GValue gvalue = G_VALUE_INIT;
      GtkLevelBarOffset *offset;

      if (!_gtk_builder_check_parent (data->builder, context, "offsets", error))
        return;

      if (!g_markup_collect_attributes (element_name, names, values, error,
                                        G_MARKUP_COLLECT_STRING, "name", &name,
                                        G_MARKUP_COLLECT_STRING, "value", &value,
                                        G_MARKUP_COLLECT_INVALID))
789
        {
790 791
          _gtk_builder_prefix_error (data->builder, context, error);
          return;
792 793
        }

794
      if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_DOUBLE, value, &gvalue, error))
795
        {
796 797
          _gtk_builder_prefix_error (data->builder, context, error);
          return;
798
        }
799 800 801

      offset = gtk_level_bar_offset_new (name, g_value_get_double (&gvalue));
      data->offsets = g_list_prepend (data->offsets, offset);
802 803 804
    }
  else
    {
805 806 807
      _gtk_builder_error_unhandled_tag (data->builder, context,
                                        "GtkLevelBar", element_name,
                                        error);
808 809 810 811 812 813 814 815 816 817 818 819 820 821
    }
}

static const GMarkupParser offset_parser =
{
  offset_start_element
};

static gboolean
gtk_level_bar_buildable_custom_tag_start (GtkBuildable  *buildable,
                                          GtkBuilder    *builder,
                                          GObject       *child,
                                          const gchar   *tagname,
                                          GMarkupParser *parser,
822
                                          gpointer      *parser_data)
823
{
824
  OffsetsParserData *data;
825 826 827 828 829 830 831

  if (child)
    return FALSE;

  if (strcmp (tagname, "offsets") != 0)
    return FALSE;

832 833 834 835
  data = g_slice_new0 (OffsetsParserData);
  data->self = GTK_LEVEL_BAR (buildable);
  data->builder = builder;
  data->offsets = NULL;
836 837

  *parser = offset_parser;
838
  *parser_data = data;
839 840 841 842 843 844 845 846 847 848 849

  return TRUE;
}

static void
gtk_level_bar_buildable_custom_finished (GtkBuildable *buildable,
                                         GtkBuilder   *builder,
                                         GObject      *child,
                                         const gchar  *tagname,
                                         gpointer      user_data)
{
850
  OffsetsParserData *data = user_data;
851 852 853 854
  GtkLevelBar *self;
  GtkLevelBarOffset *offset;
  GList *l;

855
  self = data->self;
856 857 858 859

  if (strcmp (tagname, "offsets") != 0)
    goto out;

860
  for (l = data->offsets; l != NULL; l = l->next)
861 862 863 864 865 866
    {
      offset = l->data;
      gtk_level_bar_add_offset_value (self, offset->name, offset->value);
    }

 out:
867 868
  g_list_free_full (data->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
  g_slice_free (OffsetsParserData, data);
869 870 871 872 873 874 875 876 877 878
}

static void
gtk_level_bar_buildable_init (GtkBuildableIface *iface)
{
  iface->custom_tag_start = gtk_level_bar_buildable_custom_tag_start;
  iface->custom_finished = gtk_level_bar_buildable_custom_finished;
}

static void
879 880
gtk_level_bar_set_orientation (GtkLevelBar    *self,
                               GtkOrientation  orientation)
881 882 883 884 885 886
{
  if (self->priv->orientation != orientation)
    {
      self->priv->orientation = orientation;
      _gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
      gtk_widget_queue_resize (GTK_WIDGET (self));
887
      g_object_notify (G_OBJECT (self), "orientation");
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
    }
}

static void
gtk_level_bar_get_property (GObject    *obj,
                            guint       property_id,
                            GValue     *value,
                            GParamSpec *pspec)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (obj);

  switch (property_id)
    {
    case PROP_VALUE:
      g_value_set_double (value, gtk_level_bar_get_value (self));
      break;
    case PROP_MIN_VALUE:
      g_value_set_double (value, gtk_level_bar_get_min_value (self));
      break;
    case PROP_MAX_VALUE:
      g_value_set_double (value, gtk_level_bar_get_max_value (self));
      break;
    case PROP_MODE:
      g_value_set_enum (value, gtk_level_bar_get_mode (self));
      break;
913 914 915
    case PROP_INVERTED:
      g_value_set_boolean (value, gtk_level_bar_get_inverted (self));
      break;
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
    case PROP_ORIENTATION:
      g_value_set_enum (value, self->priv->orientation);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
      break;
    }
}

static void
gtk_level_bar_set_property (GObject      *obj,
                            guint         property_id,
                            const GValue *value,
                            GParamSpec   *pspec)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (obj);

  switch (property_id)
    {
    case PROP_VALUE:
      gtk_level_bar_set_value (self, g_value_get_double (value));
      break;
    case PROP_MIN_VALUE:
      gtk_level_bar_set_min_value (self, g_value_get_double (value));
      break;
    case PROP_MAX_VALUE:
      gtk_level_bar_set_max_value (self, g_value_get_double (value));
      break;
    case PROP_MODE:
      gtk_level_bar_set_mode (self, g_value_get_enum (value));
      break;
947 948 949
    case PROP_INVERTED:
      gtk_level_bar_set_inverted (self, g_value_get_boolean (value));
      break;
950 951 952 953 954 955 956 957 958 959 960 961 962
    case PROP_ORIENTATION:
      gtk_level_bar_set_orientation (self, g_value_get_enum (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, property_id, pspec);
      break;
    }
}

static void
gtk_level_bar_finalize (GObject *obj)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (obj);
963
  GtkLevelBarPrivate *priv = self->priv;
964
  gint i;
965

966
  g_list_free_full (priv->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
967 968 969 970 971 972

  for (i = 0; i < priv->n_blocks; i++)
    g_clear_object (&priv->block_gadget[i]);
  g_free (priv->block_gadget);

  g_clear_object (&priv->trough_gadget);
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

  G_OBJECT_CLASS (gtk_level_bar_parent_class)->finalize (obj);
}

static void
gtk_level_bar_class_init (GtkLevelBarClass *klass)
{
  GObjectClass *oclass = G_OBJECT_CLASS (klass);
  GtkWidgetClass *wclass = GTK_WIDGET_CLASS (klass);

  oclass->get_property = gtk_level_bar_get_property;
  oclass->set_property = gtk_level_bar_set_property;
  oclass->finalize = gtk_level_bar_finalize;

  wclass->draw = gtk_level_bar_draw;
988
  wclass->size_allocate = gtk_level_bar_size_allocate;
989 990
  wclass->get_preferred_width = gtk_level_bar_get_preferred_width;
  wclass->get_preferred_height = gtk_level_bar_get_preferred_height;
991
  wclass->state_flags_changed = gtk_level_bar_state_flags_changed;
992
  wclass->direction_changed = gtk_level_bar_direction_changed;
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010

  g_object_class_override_property (oclass, PROP_ORIENTATION, "orientation");

  /**
   * GtkLevelBar::offset-changed:
   * @self: a #GtkLevelBar
   * @name: the name of the offset that changed value
   *
   * Emitted when an offset specified on the bar changes value as an
   * effect to gtk_level_bar_add_offset_value() being called.
   *
   * The signal supports detailed connections; you can connect to the
   * detailed signal "changed::x" in order to only receive callbacks when
   * the value of offset "x" changes.
   *
   * Since: 3.6
   */
  signals[SIGNAL_OFFSET_CHANGED] =
1011
    g_signal_new (I_("offset-changed"),
1012 1013 1014 1015
                  GTK_TYPE_LEVEL_BAR,
                  G_SIGNAL_RUN_FIRST | G_SIGNAL_DETAILED,
                  G_STRUCT_OFFSET (GtkLevelBarClass, offset_changed),
                  NULL, NULL,
1016
                  NULL,
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
                  G_TYPE_NONE,
                  1, G_TYPE_STRING);

  /**
   * GtkLevelBar:value:
   *
   * The #GtkLevelBar:value property determines the currently
   * filled value of the level bar.
   *
   * Since: 3.6
   */
  properties[PROP_VALUE] =
    g_param_spec_double ("value",
                         P_("Currently filled value level"),
                         P_("Currently filled value level of the level bar"),
                         0.0, G_MAXDOUBLE, 0.0,
1033 1034
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
  /**
   * GtkLevelBar:min-value:
   *
   * The #GtkLevelBar:min-value property determines the minimum value of
   * the interval that can be displayed by the bar.
   *
   * Since: 3.6
   */
  properties[PROP_MIN_VALUE] =
    g_param_spec_double ("min-value",
                         P_("Minimum value level for the bar"),
                         P_("Minimum value level that can be displayed by the bar"),
                         0.0, G_MAXDOUBLE, 0.0,
1048 1049
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
  /**
   * GtkLevelBar:max-value:
   *
   * The #GtkLevelBar:max-value property determaxes the maximum value of
   * the interval that can be displayed by the bar.
   *
   * Since: 3.6
   */
  properties[PROP_MAX_VALUE] =
    g_param_spec_double ("max-value",
                         P_("Maximum value level for the bar"),
                         P_("Maximum value level that can be displayed by the bar"),
                         0.0, G_MAXDOUBLE, 1.0,
1063 1064
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1065 1066 1067
  /**
   * GtkLevelBar:mode:
   *
1068
   * The #GtkLevelBar:mode property determines the way #GtkLevelBar
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
   * interprets the value properties to draw the level fill area.
   * Specifically, when the value is #GTK_LEVEL_BAR_MODE_CONTINUOUS,
   * #GtkLevelBar will draw a single block representing the current value in
   * that area; when the value is #GTK_LEVEL_BAR_MODE_DISCRETE,
   * the widget will draw a succession of separate blocks filling the
   * draw area, with the number of blocks being equal to the units separating
   * the integral roundings of #GtkLevelBar:min-value and #GtkLevelBar:max-value.
   *
   * Since: 3.6
   */
  properties[PROP_MODE] =
    g_param_spec_enum ("mode",
                       P_("The mode of the value indicator"),
                       P_("The mode of the value indicator displayed by the bar"),
                       GTK_TYPE_LEVEL_BAR_MODE,
                       GTK_LEVEL_BAR_MODE_CONTINUOUS,
1085
                       G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
1086

1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
  /**
   * GtkLevelBar:inverted:
   *
   * Level bars normally grow from top to bottom or left to right.
   * Inverted level bars grow in the opposite direction.
   *
   * Since: 3.8
   */
  properties[PROP_INVERTED] =
    g_param_spec_boolean ("inverted",
                          P_("Inverted"),
                          P_("Invert the direction in which the level bar grows"),
                          FALSE,
1100
                          G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
1101

1102 1103 1104 1105 1106 1107 1108
  /**
   * GtkLevelBar:min-block-height:
   *
   * The min-block-height style property determines the minimum
   * height for blocks filling the #GtkLevelBar widget.
   *
   * Since: 3.6
1109 1110 1111
   *
   * Deprecated: 3.20: Use the standard min-width/min-height CSS properties on
   *   the block elements; the value of this style property is ignored.
1112 1113 1114 1115 1116 1117
   */
  gtk_widget_class_install_style_property
    (wclass, g_param_spec_int ("min-block-height",
                               P_("Minimum height for filling blocks"),
                               P_("Minimum height for blocks that fill the bar"),
                               1, G_MAXINT, DEFAULT_BLOCK_SIZE,
1118
                               G_PARAM_READWRITE|G_PARAM_DEPRECATED));
1119 1120 1121 1122 1123 1124 1125
  /**
   * GtkLevelBar:min-block-width:
   *
   * The min-block-width style property determines the minimum
   * width for blocks filling the #GtkLevelBar widget.
   *
   * Since: 3.6
1126 1127 1128
   *
   * Deprecated: 3.20: Use the standard min-width/min-height CSS properties on
   *   the block elements; the value of this style property is ignored.
1129 1130 1131 1132 1133 1134
   */
  gtk_widget_class_install_style_property
    (wclass, g_param_spec_int ("min-block-width",
                               P_("Minimum width for filling blocks"),
                               P_("Minimum width for blocks that fill the bar"),
                               1, G_MAXINT, DEFAULT_BLOCK_SIZE,
1135
                               G_PARAM_READWRITE|G_PARAM_DEPRECATED));
1136 1137

  g_object_class_install_properties (oclass, LAST_PROPERTY, properties);
1138 1139

  gtk_widget_class_set_accessible_type (wclass, GTK_TYPE_LEVEL_BAR_ACCESSIBLE);
1140
  gtk_widget_class_set_css_name (wclass, "levelbar");
1141 1142
}

1143 1144 1145 1146
static void
gtk_level_bar_init (GtkLevelBar *self)
{
  GtkLevelBarPrivate *priv;
1147
  GtkCssNode *widget_node, *trough_node;
1148 1149 1150 1151 1152 1153

  priv = self->priv = gtk_level_bar_get_instance_private (self);

  priv->cur_value = 0.0;
  priv->min_value = 0.0;
  priv->max_value = 1.0;
1154 1155

  /* set initial orientation and style classes */
1156
  priv->orientation = GTK_ORIENTATION_HORIZONTAL;
1157 1158
  _gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));

1159
  priv->inverted = FALSE;
1160

1161
  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
1162 1163

  widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
  priv->trough_gadget = gtk_css_custom_gadget_new ("trough",
                                                   GTK_WIDGET (self),
                                                   NULL, NULL,
                                                   gtk_level_bar_measure_trough,
                                                   gtk_level_bar_allocate_trough,
                                                   gtk_level_bar_render_trough,
                                                   NULL, NULL);
  trough_node = gtk_css_gadget_get_node (priv->trough_gadget);
  gtk_css_node_set_parent (trough_node, widget_node);
  gtk_css_node_set_state (trough_node, gtk_css_node_get_state (widget_node));
1174 1175 1176

  gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_LOW, 0.25);
  gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_HIGH, 0.75);
1177
  gtk_level_bar_ensure_offset (self, GTK_LEVEL_BAR_OFFSET_FULL, 1.0);
1178

1179
  priv->block_gadget = NULL;
1180
  priv->n_blocks = 0;
1181

1182 1183 1184 1185
  priv->bar_mode = GTK_LEVEL_BAR_MODE_CONTINUOUS;
  update_mode_style_classes (self);
  update_block_nodes (self);
  update_level_style_classes (self);
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
}

/**
 * gtk_level_bar_new:
 *
 * Creates a new #GtkLevelBar.
 *
 * Returns: a #GtkLevelBar.
 *
 * Since: 3.6
 */
GtkWidget *
gtk_level_bar_new (void)
{
  return g_object_new (GTK_TYPE_LEVEL_BAR, NULL);
}

/**
 * gtk_level_bar_new_for_interval:
 * @min_value: a positive value
 * @max_value: a positive value
 *
 * Utility constructor that creates a new #GtkLevelBar for the specified
 * interval.
 *
 * Returns: a #GtkLevelBar
 *
 * Since: 3.6
 */
GtkWidget *
gtk_level_bar_new_for_interval (gdouble min_value,
                                gdouble max_value)
{
  return g_object_new (GTK_TYPE_LEVEL_BAR,
                       "min-value", min_value,
                       "max-value", max_value,
                       NULL);
}

/**
 * gtk_level_bar_get_min_value:
 * @self: a #GtkLevelBar
 *
 * Returns the value of the #GtkLevelBar:min-value property.
 *
 * Returns: a positive value
 *
 * Since: 3.6
 */
gdouble
gtk_level_bar_get_min_value (GtkLevelBar *self)
{
  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);

  return self->priv->min_value;
}

/**
 * gtk_level_bar_get_max_value:
 * @self: a #GtkLevelBar
 *
 * Returns the value of the #GtkLevelBar:max-value property.
 *
 * Returns: a positive value
 *
 * Since: 3.6
 */
gdouble
gtk_level_bar_get_max_value (GtkLevelBar *self)
{
  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);

  return self->priv->max_value;
}

/**
 * gtk_level_bar_get_value:
 * @self: a #GtkLevelBar
 *
 * Returns the value of the #GtkLevelBar:value property.
 *
 * Returns: a value in the interval between
 *     #GtkLevelBar:min-value and #GtkLevelBar:max-value
 *
 * Since: 3.6
 */
gdouble
gtk_level_bar_get_value (GtkLevelBar *self)
{
  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);

  return self->priv->cur_value;
}

static void
gtk_level_bar_set_value_internal (GtkLevelBar *self,
                                  gdouble      value)
{
  self->priv->cur_value = value;
  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_VALUE]);
1286
  gtk_widget_queue_allocate (GTK_WIDGET (self));
1287 1288 1289 1290 1291 1292 1293 1294 1295
}

/**
 * gtk_level_bar_set_min_value:
 * @self: a #GtkLevelBar
 * @value: a positive value
 *
 * Sets the value of the #GtkLevelBar:min-value property.
 *
1296 1297 1298
 * You probably want to update preexisting level offsets after calling
 * this function.
 *
1299 1300 1301 1302 1303 1304
 * Since: 3.6
 */
void
gtk_level_bar_set_min_value (GtkLevelBar *self,
                             gdouble      value)
{
1305 1306
  GtkLevelBarPrivate *priv = self->priv;

1307 1308 1309
  g_return_if_fail (GTK_IS_LEVEL_BAR (self));
  g_return_if_fail (value >= 0.0);

1310 1311
  if (value == priv->min_value)
    return;
1312

1313
  priv->min_value = value;
1314

1315 1316 1317 1318 1319 1320
  if (priv->min_value > priv->cur_value)
    gtk_level_bar_set_value_internal (self, priv->min_value);

  update_block_nodes (self);
  update_level_style_classes (self);
  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MIN_VALUE]);
1321 1322 1323 1324 1325 1326 1327 1328 1329
}

/**
 * gtk_level_bar_set_max_value:
 * @self: a #GtkLevelBar
 * @value: a positive value
 *
 * Sets the value of the #GtkLevelBar:max-value property.
 *
1330 1331 1332
 * You probably want to update preexisting level offsets after calling
 * this function.
 *
1333 1334 1335 1336 1337 1338
 * Since: 3.6
 */
void
gtk_level_bar_set_max_value (GtkLevelBar *self,
                             gdouble      value)
{
1339 1340
  GtkLevelBarPrivate *priv = self->priv;

1341 1342 1343
  g_return_if_fail (GTK_IS_LEVEL_BAR (self));
  g_return_if_fail (value >= 0.0);

1344 1345
  if (value == priv->max_value)
    return;
1346

1347
  priv->max_value = value;
1348

1349 1350 1351 1352 1353 1354 1355
  if (priv->max_value < priv->cur_value)
    gtk_level_bar_set_value_internal (self, priv->max_value);

  gtk_level_bar_ensure_offsets_in_range (self);
  update_block_nodes (self);
  update_level_style_classes (self);
  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_VALUE]);
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
}

/**
 * gtk_level_bar_set_value:
 * @self: a #GtkLevelBar
 * @value: a value in the interval between
 *     #GtkLevelBar:min-value and #GtkLevelBar:max-value
 *
 * Sets the value of the #GtkLevelBar:value property.
 *
 * Since: 3.6
 */
void
gtk_level_bar_set_value (GtkLevelBar *self,
                         gdouble      value)
{
  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

1374 1375 1376 1377 1378
  if (value == self->priv->cur_value)
    return;

  gtk_level_bar_set_value_internal (self, value);
  update_level_style_classes (self);
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
}

/**
 * gtk_level_bar_get_mode:
 * @self: a #GtkLevelBar
 *
 * Returns the value of the #GtkLevelBar:mode property.
 *
 * Returns: a #GtkLevelBarMode
 *
 * Since: 3.6
 */
GtkLevelBarMode
gtk_level_bar_get_mode (GtkLevelBar *self)
{
  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0);

  return self->priv->bar_mode;
}

/**
 * gtk_level_bar_set_mode:
 * @self: a #GtkLevelBar
 * @mode: a #GtkLevelBarMode
 *
 * Sets the value of the #GtkLevelBar:mode property.
 *
 * Since: 3.6
 */
void
gtk_level_bar_set_mode (GtkLevelBar     *self,
                        GtkLevelBarMode  mode)
{
1412 1413
  GtkLevelBarPrivate *priv = self->priv;

1414 1415
  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
  if (priv->bar_mode == mode)
    return;

  priv->bar_mode = mode;

  update_mode_style_classes (self);
  update_block_nodes (self);
  update_level_style_classes (self);
  gtk_widget_queue_resize (GTK_WIDGET (self));
  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODE]);
1426 1427 1428

}

1429 1430 1431 1432 1433 1434
/**
 * gtk_level_bar_get_inverted:
 * @self: a #GtkLevelBar
 *
 * Return the value of the #GtkLevelBar:inverted property.
 *
1435
 * Returns: %TRUE if the level bar is inverted
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
 *
 * Since: 3.8
 */
gboolean
gtk_level_bar_get_inverted (GtkLevelBar *self)
{
  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), FALSE);

  return self->priv->inverted;
}

/**
 * gtk_level_bar_set_inverted:
 * @self: a #GtkLevelBar
Stefano Facchini's avatar
Stefano Facchini committed
1450
 * @inverted: %TRUE to invert the level bar
1451 1452 1453 1454 1455 1456 1457 1458 1459
 *
 * Sets the value of the #GtkLevelBar:inverted property.
 *
 * Since: 3.8
 */
void
gtk_level_bar_set_inverted (GtkLevelBar *self,
                            gboolean     inverted)
{
1460 1461
  GtkLevelBarPrivate *priv = self->priv;

1462 1463
  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

1464 1465 1466 1467 1468 1469 1470
  if (priv->inverted == inverted)
    return;

  priv->inverted = inverted;
  gtk_widget_queue_resize (GTK_WIDGET (self));
  update_level_style_classes (self);
  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_INVERTED]);
1471 1472
}

1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
/**
 * gtk_level_bar_remove_offset_value:
 * @self: a #GtkLevelBar
 * @name: (allow-none): the name of an offset in the bar
 *
 * Removes an offset marker previously added with
 * gtk_level_bar_add_offset_value().
 *
 * Since: 3.6
 */
void
gtk_level_bar_remove_offset_value (GtkLevelBar *self,
                                   const gchar *name)
{
1487
  GtkLevelBarPrivate *priv = self->priv;
1488 1489 1490 1491
  GList *existing;

  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

1492
  existing = g_list_find_custom (priv->offsets, name, offset_find_func);
1493 1494 1495
  if (existing)
    {
      gtk_level_bar_offset_free (existing->data);
1496
      priv->offsets = g_list_delete_link (priv->offsets, existing);
1497

1498
      update_level_style_classes (self);
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
    }
}

/**
 * gtk_level_bar_add_offset_value:
 * @self: a #GtkLevelBar
 * @name: the name of the new offset
 * @value: the value for the new offset
 *
 * Adds a new offset marker on @self at the position specified by @value.
 * When the bar value is in the interval topped by @value (or between @value
 * and #GtkLevelBar:max-value in case the offset is the last one on the bar)
1511
 * a style class named `level-`@name will be applied
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
 * when rendering the level bar fill.
 * If another offset marker named @name exists, its value will be
 * replaced by @value.
 *
 * Since: 3.6
 */
void
gtk_level_bar_add_offset_value (GtkLevelBar *self,
                                const gchar *name,
                                gdouble      value)
{
  GQuark name_quark;

  g_return_if_fail (GTK_IS_LEVEL_BAR (self));
  g_return_if_fail (gtk_level_bar_value_in_interval (self, value));

  if (!gtk_level_bar_ensure_offset (self, name, value))
    return;

1531
  update_level_style_classes (self);
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
  name_quark = g_quark_from_string (name);
  g_signal_emit (self, signals[SIGNAL_OFFSET_CHANGED], name_quark, name);
}

/**
 * gtk_level_bar_get_offset_value:
 * @self: a #GtkLevelBar
 * @name: (allow-none): the name of an offset in the bar
 * @value: (out): location where to store the value
 *
 * Fetches the value specified for the offset marker @name in @self,
 * returning %TRUE in case an offset named @name was found.
 *
 * Returns: %TRUE if the specified offset is found
 *
 * Since: 3.6
 */
gboolean
gtk_level_bar_get_offset_value (GtkLevelBar *self,
                                const gchar *name,
                                gdouble     *value)
{
  GList *existing;
  GtkLevelBarOffset *offset = NULL;

  g_return_val_if_fail (GTK_IS_LEVEL_BAR (self), 0.0);

  existing = g_list_find_custom (self->priv->offsets, name, offset_find_func);
  if (existing)
    offset = existing->data;

  if (!offset)
    return FALSE;

  if (value)
    *value = offset->value;

  return TRUE;
}