gtklevelbar.c 44.9 KB
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/* 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
 * the bar will be considered in a different state. GTK will add two offsets
 * by default on the level bar: #GTK_LEVEL_BAR_OFFSET_LOW and
 * #GTK_LEVEL_BAR_OFFSET_HIGH, with values 0.25 and 0.75 respectively.
 *
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 * ## Adding a custom offset on the bar
 *
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 * |[<!-- language="C" -->
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 *
 * static GtkWidget *
 * create_level_bar (void)
 * {
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 *   GtkWidget *widget;
 *   GtkLevelBar *bar;
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 *
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 *   widget = gtk_level_bar_new ();
 *   bar = GTK_LEVEL_BAR (widget);
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 *
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 *   // This changes the value of the default low offset
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 *
 *   gtk_level_bar_add_offset_value (bar,
 *                                   GTK_LEVEL_BAR_OFFSET_LOW,
 *                                   0.10);
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 *
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 *   // This adds a new offset to the bar; the application will
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 *   // be able to change its color CSS like this:
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 *   //
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 *   // levelbar block.my-offset {
 *   //   background-color: magenta;
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 *   //   border-style: solid;
 *   //   border-color: black;
 *   //   border-style: 1px;
 *   // }
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 *
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 *   gtk_level_bar_add_offset_value (bar, "my-offset", 0.60);
 *
 *   return widget;
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 * }
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 * ]|
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 *
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 * The default interval of values is between zero and one, but it’s possible to
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 * 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
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 * as a finite number of separated blocks instead of a single one. The number
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 * of blocks that will be rendered is equal to the number of units specified by
 * the admissible interval.
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 *
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 * For instance, to build a bar rendered with five blocks, it’s sufficient to
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 * set the minimum value to 0 and the maximum value to 5 after changing the indicator
 * mode to discrete.
 *
 * Since: 3.6
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 *
 * # CSS nodes
 *
 * |[<!-- language="plain" -->
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 * levelbar[.discrete]
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 * ╰── trough
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 *     ├── block.filled.<level-name>
 *     ┊
 *     ├── block.empty
 *     ┊
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 * ]|
 *
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 * 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
 * drawn. The block.filled nodes also get a style class .<level-name> corresponding
 * to the level for the current value.
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 */
#include "config.h"

#include "gtkbuildable.h"
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#include "gtkbuilderprivate.h"
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#include "gtkintl.h"
#include "gtkorientableprivate.h"
#include "gtklevelbar.h"
#include "gtkmarshalers.h"
#include "gtkstylecontext.h"
#include "gtktypebuiltins.h"
#include "gtkwidget.h"
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#include "gtkwidgetprivate.h"
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#include "gtkstylecontextprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcssnodeprivate.h"
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#include <math.h>
#include <stdlib.h>

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#include "a11y/gtklevelbaraccessible.h"

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#include "fallback-c89.c"

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#define DEFAULT_BLOCK_SIZE 3

enum {
  PROP_VALUE = 1,
  PROP_MIN_VALUE,
  PROP_MAX_VALUE,
  PROP_MODE,
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  PROP_INVERTED,
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  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;

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  GtkLevelBarMode bar_mode;

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  gdouble min_value;
  gdouble max_value;
  gdouble cur_value;

  GList *offsets;

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  GtkCssNode *trough_node;
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  GtkCssNode **block_node;
  guint n_blocks;
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  guint inverted : 1;
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};

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

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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))

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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;

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

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

  if (offset)
    {
      gtk_level_bar_offset_free (offset);
      self->priv->offsets = g_list_delete_link (self->priv->offsets, existing);
    }

  offset = gtk_level_bar_offset_new (name, value);
  self->priv->offsets = g_list_insert_sorted (self->priv->offsets, offset, offset_sort_func);

  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 void
gtk_level_bar_get_min_block_size (GtkLevelBar *self,
                                  gint        *block_width,
                                  gint        *block_height)
{
  GtkWidget *widget = GTK_WIDGET (self);
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  GtkStyleContext *context;
  GtkStateFlags state;
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  GtkBorder border, tmp, tmp2;
  gint min_width, min_height;

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  context = gtk_widget_get_style_context (widget);
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  gtk_style_context_save_to_node (context, self->priv->block_node[0]);
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  state = gtk_style_context_get_state (context);
  gtk_style_context_get_border (context, state, &border);
  gtk_style_context_get_padding (context, state, &tmp);
  gtk_style_context_get_margin (context, state, &tmp2);
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  gtk_style_context_restore (context);

  gtk_style_context_get_style (context,
                               "min-block-width", &min_width,
                               "min-block-height", &min_height,
                               NULL);

  border.top += tmp.top;
  border.right += tmp.right;
  border.bottom += tmp.bottom;
  border.left += tmp.left;

  border.top += tmp2.top;
  border.right += tmp2.right;
  border.bottom += tmp2.bottom;
  border.left += tmp2.left;

  if (block_width)
    *block_width = MAX (border.left + border.right, min_width);
  if (block_height)
    *block_height = MAX (border.top + border.bottom, min_height);
}

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;
}

static void
gtk_level_bar_get_borders (GtkLevelBar *self,
                           GtkBorder   *borders_out)
{
  GtkWidget *widget = GTK_WIDGET (self);
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  GtkStyleContext *context;
  GtkStateFlags state;
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  GtkBorder border, tmp;

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  context = gtk_widget_get_style_context (widget);
  gtk_style_context_save_to_node (context, self->priv->trough_node);
  state = gtk_style_context_get_state (context);
  gtk_style_context_get_border (context, state, &border);
  gtk_style_context_get_padding (context, state, &tmp);
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  gtk_style_context_restore (context);

  border.top += tmp.top;
  border.right += tmp.right;
  border.bottom += tmp.bottom;
  border.left += tmp.left;

  if (borders_out)
    *borders_out = border;
}

static void
gtk_level_bar_draw_fill_continuous (GtkLevelBar           *self,
                                    cairo_t               *cr,
                                    cairo_rectangle_int_t *fill_area)
{
  GtkWidget *widget = GTK_WIDGET (self);
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  GtkStyleContext *context;
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  cairo_rectangle_int_t base_area, block_area;
  GtkBorder block_margin;
  gdouble fill_percentage;
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  gboolean inverted;

  inverted = self->priv->inverted;
  if (gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL)
    {
      if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
        inverted = !inverted;
    }
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  context = gtk_widget_get_style_context (widget);

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  /* render the empty (unfilled) part */
  gtk_style_context_save_to_node (context, self->priv->block_node[inverted ? 0 : 1]);
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  gtk_style_context_get_margin (context, gtk_style_context_get_state (context), &block_margin);
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  base_area = *fill_area;
  base_area.x += block_margin.left;
  base_area.y += block_margin.top;
  base_area.width -= block_margin.left + block_margin.right;
  base_area.height -= block_margin.top + block_margin.bottom;

  gtk_render_background (context, cr, base_area.x, base_area.y,
                         base_area.width, base_area.height);
  gtk_render_frame (context, cr, base_area.x, base_area.y,
                    base_area.width, base_area.height);

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  gtk_style_context_restore (context);
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  /* now render the filled part on top of it */
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  block_area = base_area;

  fill_percentage = (self->priv->cur_value - self->priv->min_value) /
    (self->priv->max_value - self->priv->min_value);

  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
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    {
      block_area.width = (gint) floor (block_area.width * fill_percentage);

      if (inverted)
        block_area.x += base_area.width - block_area.width;
    }
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  else
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    {
      block_area.height = (gint) floor (block_area.height * fill_percentage);

      if (inverted)
        block_area.y += base_area.height - block_area.height;
    }
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  gtk_style_context_save_to_node (context, self->priv->block_node[inverted ? 1 : 0]);

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  gtk_render_background (context, cr, block_area.x, block_area.y,
                         block_area.width, block_area.height);
  gtk_render_frame (context, cr, block_area.x, block_area.y,
                    block_area.width, block_area.height);

  gtk_style_context_restore (context);
}

static void
gtk_level_bar_draw_fill_discrete (GtkLevelBar           *self,
                                  cairo_t               *cr,
                                  cairo_rectangle_int_t *fill_area)
{
  GtkWidget *widget = GTK_WIDGET (self);
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  GtkStyleContext *context;
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  gint num_blocks, i;
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  gint block_width, block_height;
  gint block_draw_width, block_draw_height;
  GtkBorder block_margin;
  cairo_rectangle_int_t block_area;

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  context = gtk_widget_get_style_context (widget);
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  gtk_level_bar_get_min_block_size (self, &block_width, &block_height);

  block_area = *fill_area;
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  num_blocks = (gint) round (self->priv->max_value) - (gint) round (self->priv->min_value);
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  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    block_width = MAX (block_width, (gint) floor (block_area.width / num_blocks));
  else
    block_height = MAX (block_height, (gint) floor (block_area.height / num_blocks));

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  gtk_style_context_save_to_node (context, self->priv->block_node[0]);
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  gtk_style_context_get_margin (context, gtk_style_context_get_state (context), &block_margin);
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  gtk_style_context_restore (context);
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  block_draw_width = block_width - block_margin.left - block_margin.right;
  block_draw_height = block_height - block_margin.top - block_margin.bottom;

  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      block_draw_height = MAX (block_draw_height, block_area.height - block_margin.top - block_margin.bottom);
      block_area.y += block_margin.top;
    }
  else
    {
      block_draw_width = MAX (block_draw_width, block_area.width - block_margin.left - block_margin.right);
      block_area.x += block_margin.left;
    }

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  for (i = 0; i < num_blocks; i++)
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    {
      if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
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        block_area.x += block_margin.left;
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      else
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        block_area.y += block_margin.top;
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      gtk_style_context_save_to_node (context, self->priv->block_node[i]);
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      gtk_render_background (context, cr,
                             block_area.x, block_area.y,
                             block_draw_width, block_draw_height);
      gtk_render_frame (context, cr,
                        block_area.x, block_area.y,
                        block_draw_width, block_draw_height);

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      gtk_style_context_restore (context);

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      if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
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        block_area.x += block_draw_width + block_margin.right;
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      else
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        block_area.y += block_draw_height + block_margin.bottom;
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    }
}

static void
gtk_level_bar_draw_fill (GtkLevelBar *self,
                         cairo_t     *cr)
{
  GtkWidget *widget = GTK_WIDGET (self);
  GtkBorder trough_borders;
  cairo_rectangle_int_t fill_area;

  gtk_level_bar_get_borders (self, &trough_borders);

  fill_area.x = trough_borders.left;
  fill_area.y = trough_borders.top;
  fill_area.width = gtk_widget_get_allocated_width (widget) -
    trough_borders.left - trough_borders.right;
  fill_area.height = gtk_widget_get_allocated_height (widget) -
    trough_borders.top - trough_borders.bottom;

  if (self->priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
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    gtk_level_bar_draw_fill_continuous (self, cr, &fill_area);
  else
    gtk_level_bar_draw_fill_discrete (self, cr, &fill_area);
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}

static gboolean
gtk_level_bar_draw (GtkWidget *widget,
                    cairo_t   *cr)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
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  GtkStyleContext *context;
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  gint width, height;

  width = gtk_widget_get_allocated_width (widget);
  height = gtk_widget_get_allocated_height (widget);

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  context = gtk_widget_get_style_context (widget);
  gtk_style_context_save_to_node (context, self->priv->trough_node);
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  gtk_render_background (context, cr, 0, 0, width, height);
  gtk_render_frame (context, cr, 0, 0, width, height);

  gtk_style_context_restore (context);

  gtk_level_bar_draw_fill (self, cr);

  return FALSE;
}

static void
gtk_level_bar_get_preferred_width (GtkWidget *widget,
                                   gint      *minimum,
                                   gint      *natural)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
  GtkBorder borders;
  gint num_blocks;
  gint width, block_width;

  num_blocks = gtk_level_bar_get_num_blocks (self);
  gtk_level_bar_get_min_block_size (self, &block_width, NULL);

  gtk_level_bar_get_borders (self, &borders);
  width = borders.left + borders.right;

  if (self->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    width += num_blocks * block_width;
  else
    width += block_width;

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  *minimum = width;
  *natural = width;
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}

static void
gtk_level_bar_get_preferred_height (GtkWidget *widget,
                                    gint      *minimum,
                                    gint      *natural)
{
  GtkLevelBar *self = GTK_LEVEL_BAR (widget);
  GtkBorder borders;
  gint num_blocks;
  gint height, block_height;

  num_blocks = gtk_level_bar_get_num_blocks (self);
  gtk_level_bar_get_min_block_size (self, NULL, &block_height);

  gtk_level_bar_get_borders (self, &borders);
  height = borders.top + borders.bottom;

  if (self->priv->orientation == GTK_ORIENTATION_VERTICAL)
    height += num_blocks * block_height;
  else
    height += block_height;

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  *minimum = height;
  *natural = height;
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}

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static void
gtk_level_bar_size_allocate (GtkWidget     *widget,
                             GtkAllocation *allocation)
{
  GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->size_allocate (widget, allocation);

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  _gtk_widget_set_simple_clip (widget, NULL);
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}

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static void
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node_style_changed_cb (GtkCssNode        *node,
                       GtkCssStyleChange *change,
                       GtkWidget         *widget)
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{
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  if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SIZE | GTK_CSS_AFFECTS_CLIP))
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    gtk_widget_queue_resize (widget);
  else
    gtk_widget_queue_draw (widget);
}

static void
update_block_nodes (GtkLevelBar *self)
{
  GtkLevelBarPrivate *priv = self->priv;
  guint n_blocks;
  guint i;

  if (priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
    n_blocks = 2;
  else
    n_blocks = MAX (1, (gint) (round (priv->max_value) - round (priv->min_value)));

  if (priv->n_blocks == n_blocks)
    return;
  else if (n_blocks < priv->n_blocks)
    {
      for (i = n_blocks; i < priv->n_blocks; i++)
        gtk_css_node_set_parent (priv->block_node[i], NULL);
      priv->block_node = g_renew (GtkCssNode*, priv->block_node, n_blocks);
      priv->n_blocks = n_blocks;
    }
  else
    {
      priv->block_node = g_renew (GtkCssNode*, priv->block_node, n_blocks);
      for (i = priv->n_blocks; i < n_blocks; i++)
        {
          priv->block_node[i] = gtk_css_node_new ();
          gtk_css_node_set_name (priv->block_node[i], I_("block"));
          gtk_css_node_set_parent (priv->block_node[i], priv->trough_node);
          gtk_css_node_set_state (priv->block_node[i], gtk_css_node_get_state (priv->trough_node));
          g_signal_connect_object (priv->block_node[i], "style-changed", G_CALLBACK (node_style_changed_cb), self, 0);
          g_object_unref (priv->block_node[i]);
        }
      priv->n_blocks = n_blocks;
    }
}

static void
update_mode_style_classes (GtkLevelBar *self)
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{
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  GtkLevelBarPrivate *priv = self->priv;
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  GtkCssNode *widget_node;
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  widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
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  if (priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
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    {
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      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"));
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    }
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  else if (priv->bar_mode == GTK_LEVEL_BAR_MODE_DISCRETE)
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    {
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      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"));
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    }
}

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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;
650
  gint i;
651 652 653 654

  state = gtk_widget_get_state_flags (widget);

  gtk_css_node_set_state (priv->trough_node, state);
655 656
  for (i = 0; i < priv->n_blocks; i++)
    gtk_css_node_set_state (priv->block_node[i], state);
657 658

  GTK_WIDGET_CLASS (gtk_level_bar_parent_class)->state_flags_changed (widget, previous_state);
659 660
}

661
static void
662
update_level_style_classes (GtkLevelBar *self)
663
{
664
  GtkLevelBarPrivate *priv = self->priv;
665
  gdouble value;
666
  const gchar *value_class = NULL;
667 668 669
  GtkLevelBarOffset *offset, *prev_offset;
  GList *l;

670 671
  value = gtk_level_bar_get_value (self);

672
  for (l = priv->offsets; l != NULL; l = l->next)
673 674 675 676
    {
      offset = l->data;

      /* find the right offset for our style class */
677 678
      if ((l->prev == NULL && value <= offset->value) ||
          (l->next == NULL && value >= offset->value))
679
        {
680
          value_class = offset->name;
681
        }
682
      else if (l->prev != NULL)
683 684
        {
          prev_offset = l->prev->data;
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
          if (prev_offset->value <= value && value < offset->value)
            value_class = offset->name;
        }

      if (value_class)
        break;
    }

  if (value_class)
    {
      const gchar *classes[3] = { NULL, NULL, NULL };
      gint num_filled, num_blocks, i;
      gboolean inverted;

      inverted = priv->inverted;
      if (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
          gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL)
        inverted = !inverted;

      if (priv->bar_mode == GTK_LEVEL_BAR_MODE_CONTINUOUS)
        {
          num_filled = 1;
          num_blocks = 2;
708 709 710
        }
      else
        {
711 712
          num_filled = (gint) round (priv->cur_value) - (gint) round (priv->min_value);
          num_blocks = (gint) round (priv->max_value) - (gint) round (priv->min_value);
713 714
        }

715 716 717 718 719 720 721 722 723
      classes[0] = "filled";
      classes[1] = value_class;
      for (i = 0; i < num_filled; i++)
        gtk_css_node_set_classes (priv->block_node[inverted ? num_blocks - 1 - i : i], classes);

      classes[0] = "empty";
      classes[1] = NULL;
      for (; i < num_blocks; i++)
        gtk_css_node_set_classes (priv->block_node[inverted ? num_blocks - 1 - i : i], classes);
724 725 726
    }
}

727 728 729 730 731 732 733 734 735 736 737
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);
}

738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
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;
758
  GtkBuilder *builder;
759 760 761 762 763 764 765 766 767 768 769
  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)
{
770
  OffsetsParserData *data = user_data;
771 772

  if (strcmp (element_name, "offsets") == 0)
773 774 775 776 777 778 779 780 781
    {
      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);
    }
782 783
  else if (strcmp (element_name, "offset") == 0)
    {
784 785 786 787 788 789 790 791 792 793 794 795
      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))
796
        {
797 798
          _gtk_builder_prefix_error (data->builder, context, error);
          return;
799 800
        }

801
      if (!gtk_builder_value_from_string_type (data->builder, G_TYPE_DOUBLE, value, &gvalue, error))
802
        {
803 804
          _gtk_builder_prefix_error (data->builder, context, error);
          return;
805
        }
806 807 808

      offset = gtk_level_bar_offset_new (name, g_value_get_double (&gvalue));
      data->offsets = g_list_prepend (data->offsets, offset);
809 810 811
    }
  else
    {
812 813 814
      _gtk_builder_error_unhandled_tag (data->builder, context,
                                        "GtkLevelBar", element_name,
                                        error);
815 816 817 818 819 820 821 822 823 824 825 826 827 828
    }
}

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,
829
                                          gpointer      *parser_data)
830
{
831
  OffsetsParserData *data;
832 833 834 835 836 837 838

  if (child)
    return FALSE;

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

839 840 841 842
  data = g_slice_new0 (OffsetsParserData);
  data->self = GTK_LEVEL_BAR (buildable);
  data->builder = builder;
  data->offsets = NULL;
843 844

  *parser = offset_parser;
845
  *parser_data = data;
846 847 848 849 850 851 852 853 854 855 856

  return TRUE;
}

static void
gtk_level_bar_buildable_custom_finished (GtkBuildable *buildable,
                                         GtkBuilder   *builder,
                                         GObject      *child,
                                         const gchar  *tagname,
                                         gpointer      user_data)
{
857
  OffsetsParserData *data = user_data;
858 859 860 861
  GtkLevelBar *self;
  GtkLevelBarOffset *offset;
  GList *l;

862
  self = data->self;
863 864 865 866

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

867
  for (l = data->offsets; l != NULL; l = l->next)
868 869 870 871 872 873
    {
      offset = l->data;
      gtk_level_bar_add_offset_value (self, offset->name, offset->value);
    }

 out:
874 875
  g_list_free_full (data->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
  g_slice_free (OffsetsParserData, data);
876 877 878 879 880 881 882 883 884 885
}

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
886 887
gtk_level_bar_set_orientation (GtkLevelBar    *self,
                               GtkOrientation  orientation)
888 889 890 891 892 893
{
  if (self->priv->orientation != orientation)
    {
      self->priv->orientation = orientation;
      _gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));
      gtk_widget_queue_resize (GTK_WIDGET (self));
894
      g_object_notify (G_OBJECT (self), "orientation");
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
    }
}

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;
920 921 922
    case PROP_INVERTED:
      g_value_set_boolean (value, gtk_level_bar_get_inverted (self));
      break;
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    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;
954 955 956
    case PROP_INVERTED:
      gtk_level_bar_set_inverted (self, g_value_get_boolean (value));
      break;
957 958 959 960 961 962 963 964 965 966 967 968 969
    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);
970
  GtkLevelBarPrivate *priv = self->priv;
971

972 973
  g_list_free_full (priv->offsets, (GDestroyNotify) gtk_level_bar_offset_free);
  g_free (priv->block_node);
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988

  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;
989
  wclass->size_allocate = gtk_level_bar_size_allocate;
990 991
  wclass->get_preferred_width = gtk_level_bar_get_preferred_width;
  wclass->get_preferred_height = gtk_level_bar_get_preferred_height;
992
  wclass->state_flags_changed = gtk_level_bar_state_flags_changed;
993
  wclass->direction_changed = gtk_level_bar_direction_changed;
994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011

  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] =
1012
    g_signal_new (I_("offset-changed"),
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
                  GTK_TYPE_LEVEL_BAR,
                  G_SIGNAL_RUN_FIRST | G_SIGNAL_DETAILED,
                  G_STRUCT_OFFSET (GtkLevelBarClass, offset_changed),
                  NULL, NULL,
                  _gtk_marshal_VOID__STRING,
                  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,
1034 1035
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
  /**
   * 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,
1049 1050
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
  /**
   * 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,
1064 1065
                         G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);

1066 1067 1068
  /**
   * GtkLevelBar:mode:
   *
1069
   * The #GtkLevelBar:mode property determines the way #GtkLevelBar
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
   * 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,
1086
                       G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
1087

1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
  /**
   * 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,
1101
                          G_PARAM_READWRITE|G_PARAM_STATIC_STRINGS|G_PARAM_EXPLICIT_NOTIFY);
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
  /**
   * GtkLevelBar:min-block-height:
   *
   * The min-block-height style property determines the minimum
   * height for blocks filling the #GtkLevelBar widget.
   *
   * Since: 3.6
   */
  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,
                               G_PARAM_READWRITE));
  /**
   * GtkLevelBar:min-block-width:
   *
   * The min-block-width style property determines the minimum
   * width for blocks filling the #GtkLevelBar widget.
   *
   * Since: 3.6
   */
  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,
                               G_PARAM_READWRITE));

  g_object_class_install_properties (oclass, LAST_PROPERTY, properties);
1133 1134

  gtk_widget_class_set_accessible_type (wclass, GTK_TYPE_LEVEL_BAR_ACCESSIBLE);
1135
  gtk_widget_class_set_css_name (wclass, "levelbar");
1136 1137
}

1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
static void
gtk_level_bar_init (GtkLevelBar *self)
{
  GtkLevelBarPrivate *priv;
  GtkCssNode *widget_node;

  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;
1149 1150

  /* set initial orientation and style classes */
1151
  priv->orientation = GTK_ORIENTATION_HORIZONTAL;
1152 1153
  _gtk_orientable_set_style_classes (GTK_ORIENTABLE (self));

1154
  priv->inverted = FALSE;
1155

1156
  gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167

  widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
  priv->trough_node = gtk_css_node_new ();
  gtk_css_node_set_name (priv->trough_node, I_("trough"));
  gtk_css_node_set_parent (priv->trough_node, widget_node);
  gtk_css_node_set_state (priv->trough_node, gtk_css_node_get_state (widget_node));
  g_signal_connect_object (priv->trough_node, "style-changed", G_CALLBACK (node_style_changed_cb), self, 0);
  g_object_unref (priv->trough_node);

  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);
1168
  gtk_level_bar_ensure_offset (self, "full", 1.0);
1169

1170 1171
  priv->block_node = NULL;
  priv->n_blocks = 0;
1172

1173 1174 1175 1176
  priv->bar_mode = GTK_LEVEL_BAR_MODE_CONTINUOUS;
  update_mode_style_classes (self);
  update_block_nodes (self);
  update_level_style_classes (self);
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
}

/**
 * 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]);
  gtk_widget_queue_draw (GTK_WIDGET (self));
}

/**
 * gtk_level_bar_set_min_value:
 * @self: a #GtkLevelBar
 * @value: a positive value
 *
 * Sets the value of the #GtkLevelBar:min-value property.
 *
 * Since: 3.6
 */
void
gtk_level_bar_set_min_value (GtkLevelBar *self,
                             gdouble      value)
{
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  GtkLevelBarPrivate *priv = self->priv;

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  g_return_if_fail (GTK_IS_LEVEL_BAR (self));
  g_return_if_fail (value >= 0.0);

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  if (value == priv->min_value)
    return;
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  priv->min_value = value;
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  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]);
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}

/**
 * gtk_level_bar_set_max_value:
 * @self: a #GtkLevelBar
 * @value: a positive value
 *
 * Sets the value of the #GtkLevelBar:max-value property.
 *
 * Since: 3.6
 */
void
gtk_level_bar_set_max_value (GtkLevelBar *self,
                             gdouble      value)
{
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  GtkLevelBarPrivate *priv = self->priv;

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  g_return_if_fail (GTK_IS_LEVEL_BAR (self));
  g_return_if_fail (value >= 0.0);

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  if (value == priv->max_value)
    return;
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  priv->max_value = value;
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  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]);
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}

/**
 * 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));

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  if (value == self->priv->cur_value)
    return;

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

/**
 * 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)
{
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  GtkLevelBarPrivate *priv = self->priv;

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  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

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  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]);
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}

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/**
 * gtk_level_bar_get_inverted:
 * @self: a #GtkLevelBar
 *
 * Return the value of the #GtkLevelBar:inverted property.
 *
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 * Returns: %TRUE if the level bar is inverted
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 *
 * 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
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 * @inverted: %TRUE to invert the level bar
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 *
 * Sets the value of the #GtkLevelBar:inverted property.
 *
 * Since: 3.8
 */
void
gtk_level_bar_set_inverted (GtkLevelBar *self,
                            gboolean     inverted)
{
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  GtkLevelBarPrivate *priv = self->priv;

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  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

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  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]);
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}

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/**
 * 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)
{
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  GtkLevelBarPrivate *priv = self->priv;
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  GList *existing;

  g_return_if_fail (GTK_IS_LEVEL_BAR (self));

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  existing = g_list_find_custom (priv->offsets, name, offset_find_func);
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  if (existing)
    {
      gtk_level_bar_offset_free (existing->data);
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      priv->offsets = g_list_delete_link (priv->offsets, existing);
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      update_level_style_classes (self);
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    }
}

/**
 * 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)
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 * a style class named `level-`@name will be applied
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 * 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;

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  update_level_style_classes (self);
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  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;
}