/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */

#include "config.h"

#include <string.h>

#include "gtkprogressbar.h"
#include "gtkorientable.h"
#include "gtkprivate.h"
#include "gtkintl.h"


#define MIN_HORIZONTAL_BAR_WIDTH   150
#define MIN_HORIZONTAL_BAR_HEIGHT  20
#define MIN_VERTICAL_BAR_WIDTH     22
#define MIN_VERTICAL_BAR_HEIGHT    80


struct _GtkProgressBarPrivate
{
  GtkOrientation orientation;

  gchar         *text;

  gdouble        fraction;
  gdouble        pulse_fraction;

  guint          blocks;
  gint           in_block;

  gint           activity_pos;
  guint          activity_blocks;
  guint          activity_step;

  guint          activity_dir  : 1;
  guint          activity_mode : 1;
  guint          ellipsize     : 3;
  guint          show_text     : 1;
  guint          inverted      : 1;
};

enum {
  PROP_0,
  PROP_FRACTION,
  PROP_PULSE_STEP,
  PROP_ORIENTATION,
  PROP_INVERTED,
  PROP_TEXT,
  PROP_SHOW_TEXT,
  PROP_ELLIPSIZE
};

static void gtk_progress_bar_set_property  (GObject             *object,
                                            guint                prop_id,
                                            const GValue        *value,
                                            GParamSpec          *pspec);
static void gtk_progress_bar_get_property  (GObject             *object,
                                            guint                prop_id,
                                            GValue              *value,
                                            GParamSpec          *pspec);
static gboolean gtk_progress_bar_expose    (GtkWidget           *widget,
                                            GdkEventExpose      *event);
static void gtk_progress_bar_size_request  (GtkWidget           *widget,
                                            GtkRequisition      *requisition);
static void gtk_progress_bar_size_allocate (GtkWidget           *widget,
                                            GtkAllocation       *allocation);
static void gtk_progress_bar_real_update   (GtkProgressBar      *progress);
static void gtk_progress_bar_paint         (GtkProgressBar      *progress);
static void gtk_progress_bar_act_mode_enter (GtkProgressBar     *progress);
static void gtk_progress_bar_realize       (GtkWidget           *widget);
static void gtk_progress_bar_finalize      (GObject             *object);
static void gtk_progress_bar_set_orientation (GtkProgressBar    *progress,
                                              GtkOrientation     orientation);

G_DEFINE_TYPE_WITH_CODE (GtkProgressBar, gtk_progress_bar, GTK_TYPE_WIDGET,
                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))

static void
gtk_progress_bar_class_init (GtkProgressBarClass *class)
{
  GObjectClass *gobject_class;
  GtkWidgetClass *widget_class;

  gobject_class = G_OBJECT_CLASS (class);
  widget_class = (GtkWidgetClass *) class;

  gobject_class->set_property = gtk_progress_bar_set_property;
  gobject_class->get_property = gtk_progress_bar_get_property;
  gobject_class->finalize = gtk_progress_bar_finalize;

  widget_class->realize = gtk_progress_bar_realize;
  widget_class->expose_event = gtk_progress_bar_expose;
  widget_class->size_request = gtk_progress_bar_size_request;
  widget_class->size_allocate = gtk_progress_bar_size_allocate;

  g_object_class_override_property (gobject_class,
                                    PROP_ORIENTATION,
                                    "orientation");

  g_object_class_install_property (gobject_class,
                                   PROP_INVERTED,
                                   g_param_spec_boolean ("inverted",
                                                         P_("Inverted"),
                                                         P_("Invert the direction in which the progress bar grows"),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_FRACTION,
                                   g_param_spec_double ("fraction",
                                                        P_("Fraction"),
                                                        P_("The fraction of total work that has been completed"),
                                                        0.0, 1.0, 0.0,
                                                        GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_PULSE_STEP,
                                   g_param_spec_double ("pulse-step",
                                                        P_("Pulse Step"),
                                                        P_("The fraction of total progress to move the bouncing block when pulsed"),
                                                        0.0, 1.0, 0.1,
                                                        GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_TEXT,
                                   g_param_spec_string ("text",
                                                        P_("Text"),
                                                        P_("Text to be displayed in the progress bar"),
                                                        NULL,
                                                        GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
                                   PROP_SHOW_TEXT,
                                   g_param_spec_boolean ("show-text",
                                                         P_("Show text"),
                                                         P_("Whether the progress is shown as text."),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE));

  /**
   * GtkProgressBar:ellipsize:
   *
   * The preferred place to ellipsize the string, if the progressbar does
   * not have enough room to display the entire string, specified as a
   * #PangoEllisizeMode.
   *
   * Note that setting this property to a value other than
   * %PANGO_ELLIPSIZE_NONE has the side-effect that the progressbar requests
   * only enough space to display the ellipsis "...". Another means to set a
   * progressbar's width is gtk_widget_set_size_request().
   *
   * Since: 2.6
   */
  g_object_class_install_property (gobject_class,
                                   PROP_ELLIPSIZE,
                                   g_param_spec_enum ("ellipsize",
                                                      P_("Ellipsize"),
                                                      P_("The preferred place to ellipsize the string, if the progress bar "
                                                         "does not have enough room to display the entire string, if at all."),
                                                      PANGO_TYPE_ELLIPSIZE_MODE,
                                                      PANGO_ELLIPSIZE_NONE,
                                                      GTK_PARAM_READWRITE));
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("xspacing",
                                                             P_("X spacing"),
                                                             P_("Extra spacing applied to the width of a progress bar."),
                                                             0, G_MAXINT, 7,
                                                             G_PARAM_READWRITE));
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("yspacing",
                                                             P_("Y spacing"),
                                                             P_("Extra spacing applied to the height of a progress bar."),
                                                             0, G_MAXINT, 7,
                                                             G_PARAM_READWRITE));

  /**
   * GtkProgressBar:min-horizontal-bar-width:
   *
   * The minimum horizontal width of the progress bar.
   *
   * Since: 2.14
   */
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("min-horizontal-bar-width",
                                                             P_("Minimum horizontal bar width"),
                                                             P_("The minimum horizontal width of the progress bar"),
                                                             1, G_MAXINT, MIN_HORIZONTAL_BAR_WIDTH,
                                                             G_PARAM_READWRITE));
  /**
   * GtkProgressBar:min-horizontal-bar-height:
   *
   * Minimum horizontal height of the progress bar.
   *
   * Since: 2.14
   */
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("min-horizontal-bar-height",
                                                             P_("Minimum horizontal bar height"),
                                                             P_("Minimum horizontal height of the progress bar"),
                                                             1, G_MAXINT, MIN_HORIZONTAL_BAR_HEIGHT,
                                                             G_PARAM_READWRITE));
  /**
   * GtkProgressBar:min-vertical-bar-width:
   *
   * The minimum vertical width of the progress bar.
   *
   * Since: 2.14
   */
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("min-vertical-bar-width",
                                                             P_("Minimum vertical bar width"),
                                                             P_("The minimum vertical width of the progress bar"),
                                                             1, G_MAXINT, MIN_VERTICAL_BAR_WIDTH,
                                                             G_PARAM_READWRITE));
  /**
   * GtkProgressBar:min-vertical-bar-height:
   *
   * The minimum vertical height of the progress bar.
   *
   * Since: 2.14
   */
  gtk_widget_class_install_style_property (widget_class,
                                           g_param_spec_int ("min-vertical-bar-height",
                                                             P_("Minimum vertical bar height"),
                                                             P_("The minimum vertical height of the progress bar"),
                                                             1, G_MAXINT, MIN_VERTICAL_BAR_HEIGHT,
                                                             G_PARAM_READWRITE));

  g_type_class_add_private (class, sizeof (GtkProgressBarPrivate));
}

static void
gtk_progress_bar_init (GtkProgressBar *pbar)
{
  GtkProgressBarPrivate *priv;

  pbar->priv = G_TYPE_INSTANCE_GET_PRIVATE (pbar,
                                            GTK_TYPE_PROGRESS_BAR,
                                            GtkProgressBarPrivate);
  priv = pbar->priv;

  priv->blocks = 10;
  priv->in_block = -1;
  priv->orientation = GTK_ORIENTATION_HORIZONTAL;
  priv->inverted = FALSE;
  priv->pulse_fraction = 0.1;
  priv->activity_pos = 0;
  priv->activity_dir = 1;
  priv->activity_step = 3;
  priv->activity_blocks = 5;
  priv->ellipsize = PANGO_ELLIPSIZE_NONE;
  priv->show_text = FALSE;

  priv->text = NULL;
  priv->fraction = 0.0;
}

static void
gtk_progress_bar_realize (GtkWidget *widget)
{
  GtkAllocation allocation;
  GdkWindow *window;
  GdkWindowAttr attributes;
  gint attributes_mask;

  gtk_widget_set_realized (widget, TRUE);

  gtk_widget_get_allocation (widget, &allocation);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = allocation.x;
  attributes.y = allocation.y;
  attributes.width = allocation.width;
  attributes.height = allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= GDK_EXPOSURE_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  window = gdk_window_new (gtk_widget_get_parent_window (widget),
                           &attributes, attributes_mask);
  gtk_widget_set_window (widget, window);
  gdk_window_set_user_data (window, widget);

  gtk_widget_style_attach (widget);
  gtk_style_set_background (gtk_widget_get_style (widget),
                            window, GTK_STATE_ACTIVE);
}

static void
gtk_progress_bar_set_property (GObject      *object,
                               guint         prop_id,
                               const GValue *value,
                               GParamSpec   *pspec)
{
  GtkProgressBar *pbar;

  pbar = GTK_PROGRESS_BAR (object);

  switch (prop_id)
    {
    case PROP_ORIENTATION:
      gtk_progress_bar_set_orientation (pbar, g_value_get_enum (value));
      break;
    case PROP_INVERTED:
      gtk_progress_bar_set_inverted (pbar, g_value_get_boolean (value));
      break;
    case PROP_FRACTION:
      gtk_progress_bar_set_fraction (pbar, g_value_get_double (value));
      break;
    case PROP_PULSE_STEP:
      gtk_progress_bar_set_pulse_step (pbar, g_value_get_double (value));
      break;
    case PROP_TEXT:
      gtk_progress_bar_set_text (pbar, g_value_get_string (value));
      break;
    case PROP_SHOW_TEXT:
      gtk_progress_bar_set_show_text (pbar, g_value_get_boolean (value));
      break;
    case PROP_ELLIPSIZE:
      gtk_progress_bar_set_ellipsize (pbar, g_value_get_enum (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_progress_bar_get_property (GObject      *object,
                               guint         prop_id,
                               GValue       *value,
                               GParamSpec   *pspec)
{
  GtkProgressBar *pbar = GTK_PROGRESS_BAR (object);
  GtkProgressBarPrivate* priv = pbar->priv;

  switch (prop_id)
    {
    case PROP_ORIENTATION:
      g_value_set_enum (value, priv->orientation);
      break;
    case PROP_INVERTED:
      g_value_set_boolean (value, priv->inverted);
      break;
    case PROP_FRACTION:
      g_value_set_double (value, priv->fraction);
      break;
    case PROP_PULSE_STEP:
      g_value_set_double (value, priv->pulse_fraction);
      break;
    case PROP_TEXT:
      g_value_set_string (value, priv->text);
      break;
    case PROP_SHOW_TEXT:
      g_value_set_boolean (value, priv->show_text);
      break;
    case PROP_ELLIPSIZE:
      g_value_set_enum (value, priv->ellipsize);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

GtkWidget*
gtk_progress_bar_new (void)
{
  GtkWidget *pbar;

  pbar = g_object_new (GTK_TYPE_PROGRESS_BAR, NULL);

  return pbar;
}

static void
gtk_progress_bar_real_update (GtkProgressBar *pbar)
{
  GtkProgressBarPrivate *priv;
  GtkWidget *widget;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;
  widget = GTK_WIDGET (pbar);

  if (priv->activity_mode)
    {
      GtkAllocation allocation;
      GtkStyle *style;
      guint size;

      gtk_widget_get_allocation (widget, &allocation);
      style = gtk_widget_get_style (widget);

      /* advance the block */
      if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
        {
          /* Update our activity step. */
          priv->activity_step = allocation.width * priv->pulse_fraction;

          size = MAX (2, allocation.width / priv->activity_blocks);

          if (priv->activity_dir == 0)
            {
              priv->activity_pos += priv->activity_step;
              if (priv->activity_pos + size >= allocation.width - style->xthickness)
                {
                  priv->activity_pos = allocation.width - style->xthickness - size;
                  priv->activity_dir = 1;
                }
            }
          else
            {
              priv->activity_pos -= priv->activity_step;
              if (priv->activity_pos <= style->xthickness)
                {
                  priv->activity_pos = style->xthickness;
                  priv->activity_dir = 0;
                }
            }
        }
      else
        {
          /* Update our activity step. */
          priv->activity_step = allocation.height * priv->pulse_fraction;

          size = MAX (2, allocation.height / priv->activity_blocks);

          if (priv->activity_dir == 0)
            {
              priv->activity_pos += priv->activity_step;
              if (priv->activity_pos + size >= allocation.height - style->ythickness)
                {
                  priv->activity_pos = allocation.height - style->ythickness - size;
                  priv->activity_dir = 1;
                }
            }
          else
            {
              priv->activity_pos -= priv->activity_step;
              if (priv->activity_pos <= style->ythickness)
                {
                  priv->activity_pos = style->ythickness;
                  priv->activity_dir = 0;
                }
            }
        }
    }
  gtk_widget_queue_draw (widget);
}

static void
gtk_progress_bar_finalize (GObject *object)
{
  GtkProgressBar *pbar = GTK_PROGRESS_BAR (object);
  GtkProgressBarPrivate *priv = pbar->priv;

  g_free (priv->text);

  G_OBJECT_CLASS (gtk_progress_bar_parent_class)->finalize (object);
}

static gboolean
gtk_progress_bar_expose (GtkWidget      *widget,
                         GdkEventExpose *event)
{
  GtkProgressBar *pbar = GTK_PROGRESS_BAR (widget);

  if (gtk_widget_is_drawable (widget))
    gtk_progress_bar_paint (pbar);

  return FALSE;
}

static gchar *
get_current_text (GtkProgressBar *pbar)
{
  GtkProgressBarPrivate *priv = pbar->priv;

  if (priv->text)
    return g_strdup (priv->text);
  else
    return g_strdup_printf ("%.0f %%", priv->fraction * 100.0);
}

static void
gtk_progress_bar_size_request (GtkWidget      *widget,
                               GtkRequisition *requisition)
{
  GtkProgressBar *pbar;
  GtkProgressBarPrivate *priv;
  GtkStyle *style;
  gchar *buf;
  PangoRectangle logical_rect;
  PangoLayout *layout;
  gint width, height;
  gint xspacing, yspacing;
  gint min_width, min_height;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (widget));
  g_return_if_fail (requisition != NULL);

  style = gtk_widget_get_style (widget);
  gtk_widget_style_get (widget,
                        "xspacing", &xspacing,
                        "yspacing", &yspacing,
                        NULL);

  pbar = GTK_PROGRESS_BAR (widget);
  priv = pbar->priv;

  width = 2 * style->xthickness + xspacing;
  height = 2 * style->ythickness + yspacing;

  if (priv->show_text)
    {
      buf = get_current_text (pbar);
      layout = gtk_widget_create_pango_layout (widget, buf);

      pango_layout_get_pixel_extents (layout, NULL, &logical_rect);

      if (priv->ellipsize)
        {
          PangoContext *context;
          PangoFontMetrics *metrics;
          gint char_width;

          /* The minimum size for ellipsized text is ~ 3 chars */
          context = pango_layout_get_context (layout);
          metrics = pango_context_get_metrics (context, style->font_desc, pango_context_get_language (context));

          char_width = pango_font_metrics_get_approximate_char_width (metrics);
          pango_font_metrics_unref (metrics);

          width += PANGO_PIXELS (char_width) * 3;
        }
      else
        width += logical_rect.width;

      height += logical_rect.height;

      g_object_unref (layout);
      g_free (buf);
    }

  if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
    gtk_widget_style_get (widget,
                          "min-horizontal-bar-width", &min_width,
                          "min-horizontal-bar-height", &min_height,
                          NULL);
  else
    gtk_widget_style_get (widget,
                          "min-vertical-bar-width", &min_width,
                          "min-vertical-bar-height", &min_height,
                          NULL);

  requisition->width = MAX (min_width, width);
  requisition->height = MAX (min_height, height);
}

static void
gtk_progress_bar_size_allocate (GtkWidget     *widget,
                                GtkAllocation *allocation)
{
  gtk_widget_set_allocation (widget, allocation);

  if (gtk_widget_get_realized (widget))
    gdk_window_move_resize (gtk_widget_get_window (widget),
                            allocation->x, allocation->y,
                            allocation->width, allocation->height);
}

static void
gtk_progress_bar_act_mode_enter (GtkProgressBar *pbar)
{
  GtkProgressBarPrivate *priv = pbar->priv;
  GtkAllocation allocation;
  GtkStyle *style;
  GtkWidget *widget = GTK_WIDGET (pbar);
  GtkOrientation orientation;
  gboolean inverted;

  style = gtk_widget_get_style (widget);

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

  /* calculate start pos */

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      if (!inverted)
        {
          priv->activity_pos = style->xthickness;
          priv->activity_dir = 0;
        }
      else
        {
          gtk_widget_get_allocation (widget, &allocation);
          priv->activity_pos = allocation.width - style->xthickness -
                               (allocation.height - style->ythickness * 2);
          priv->activity_dir = 1;
        }
    }
  else
    {
      if (!inverted)
        {
          priv->activity_pos = style->ythickness;
          priv->activity_dir = 0;
        }
      else
        {
          gtk_widget_get_allocation (widget, &allocation);
          priv->activity_pos = allocation.height - style->ythickness -
                               (allocation.width - style->xthickness * 2);
          priv->activity_dir = 1;
        }
    }
}

static void
gtk_progress_bar_get_activity (GtkProgressBar *pbar,
                               GtkOrientation  orientation,
                               gint           *offset,
                               gint           *amount)
{
  GtkProgressBarPrivate *priv = pbar->priv;
  GtkAllocation allocation;
  GtkWidget *widget = GTK_WIDGET (pbar);

  *offset = priv->activity_pos;

  gtk_widget_get_allocation (widget, &allocation);

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    *amount = MAX (2, allocation.width / priv->activity_blocks);
  else
    *amount = MAX (2, allocation.height / priv->activity_blocks);
}

static void
gtk_progress_bar_paint_activity (GtkProgressBar *pbar,
                                 GtkOrientation  orientation,
                                 gboolean        inverted)
{
  GtkAllocation allocation;
  GtkStyle *style;
  GtkWidget *widget = GTK_WIDGET (pbar);
  GdkRectangle area;

  style = gtk_widget_get_style (widget);
  gtk_widget_get_allocation (widget, &allocation);

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      gtk_progress_bar_get_activity (pbar, orientation, &area.x, &area.width);
      area.y = style->ythickness;
      area.height = allocation.height - 2 * style->ythickness;
    }
  else
    {
      gtk_progress_bar_get_activity (pbar, orientation, &area.y, &area.height);
      area.x = style->xthickness;
      area.width = allocation.width - 2 * style->xthickness;
    }

  gtk_paint_box (style,
                 gtk_widget_get_window (widget),
                 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
                 &area, widget, "bar",
                 area.x, area.y, area.width, area.height);
}

static void
gtk_progress_bar_paint_continuous (GtkProgressBar *pbar,
                                   gint            amount,
                                   GtkOrientation  orientation,
                                   gboolean        inverted)
{
  GtkAllocation allocation;
  GtkStyle *style;
  GtkWidget *widget = GTK_WIDGET (pbar);
  GdkRectangle area;

  if (amount <= 0)
    return;

  style = gtk_widget_get_style (widget);
  gtk_widget_get_allocation (widget, &allocation);

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      area.width = amount;
      area.height = allocation.height - style->ythickness * 2;
      area.y = style->ythickness;

      area.x = style->xthickness;
      if (inverted)
        area.x = allocation.width - amount - area.x;
    }
  else
    {
      area.width = allocation.width - style->xthickness * 2;
      area.height = amount;
      area.x = style->xthickness;

      area.y = style->ythickness;
      if (inverted)
        area.y = allocation.height - amount - area.y;
    }

  gtk_paint_box (style,
                 gtk_widget_get_window (widget),
                 GTK_STATE_PRELIGHT, GTK_SHADOW_OUT,
                 &area, widget, "bar",
                 area.x, area.y, area.width, area.height);
}

static void
gtk_progress_bar_paint_text (GtkProgressBar *pbar,
                             gint            offset,
                             gint            amount,
                             GtkOrientation  orientation,
                             gboolean        inverted)
{
  GtkProgressBarPrivate *priv = pbar->priv;
  GtkAllocation allocation;
  GtkStyle *style;
  GtkWidget *widget = GTK_WIDGET (pbar);
  gint x;
  gint y;
  gchar *buf;
  GdkRectangle rect;
  PangoLayout *layout;
  PangoRectangle logical_rect;
  GdkRectangle prelight_clip, start_clip, end_clip;
  gfloat text_xalign = 0.5;
  gfloat text_yalign = 0.5;

  style = gtk_widget_get_style (widget);
  gtk_widget_get_allocation (widget, &allocation);

  if (gtk_widget_get_direction (widget) != GTK_TEXT_DIR_LTR)
    text_xalign = 1.0 - text_xalign;

  buf = get_current_text (pbar);

  layout = gtk_widget_create_pango_layout (widget, buf);
  pango_layout_set_ellipsize (layout, priv->ellipsize);
  if (priv->ellipsize)
    pango_layout_set_width (layout, allocation.width * PANGO_SCALE);

  pango_layout_get_pixel_extents (layout, NULL, &logical_rect);

  x = style->xthickness + 1 + text_xalign * (allocation.width - 2 * style->xthickness - 2 - logical_rect.width);

  y = style->ythickness + 1 + text_yalign * (allocation.height - 2 * style->ythickness - 2 - logical_rect.height);

  rect.x = style->xthickness;
  rect.y = style->ythickness;
  rect.width = allocation.width - 2 * style->xthickness;
  rect.height = allocation.height - 2 * style->ythickness;

  prelight_clip = start_clip = end_clip = rect;

  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    {
      if (!inverted)
        {
          if (offset != -1)
            prelight_clip.x = offset;
          prelight_clip.width = amount;
          start_clip.width = prelight_clip.x - start_clip.x;
          end_clip.x = start_clip.x + start_clip.width + prelight_clip.width;
          end_clip.width -= prelight_clip.width + start_clip.width;
        }
      else
        {
          if (offset != -1)
            prelight_clip.x = offset;
          else
            prelight_clip.x = rect.x + rect.width - amount;
          prelight_clip.width = amount;
          start_clip.width = prelight_clip.x - start_clip.x;
          end_clip.x = start_clip.x + start_clip.width + prelight_clip.width;
          end_clip.width -= prelight_clip.width + start_clip.width;
        }
    }
  else
    {
      if (!inverted)
        {
          if (offset != -1)
            prelight_clip.y = offset;
          prelight_clip.height = amount;
          start_clip.height = prelight_clip.y - start_clip.y;
          end_clip.y = start_clip.y + start_clip.height + prelight_clip.height;
          end_clip.height -= prelight_clip.height + start_clip.height;
        }
      else
        {
          if (offset != -1)
            prelight_clip.y = offset;
          else
            prelight_clip.y = rect.y + rect.height - amount;
          prelight_clip.height = amount;
          start_clip.height = prelight_clip.y - start_clip.y;
          end_clip.y = start_clip.y + start_clip.height + prelight_clip.height;
          end_clip.height -= prelight_clip.height + start_clip.height;
        }
    }

  if (start_clip.width > 0 && start_clip.height > 0)
    gtk_paint_layout (style,
                      gtk_widget_get_window (widget),
                      GTK_STATE_NORMAL,
                      FALSE,
                      &start_clip,
                      widget,
                      "progressbar",
                      x, y,
                      layout);

  if (end_clip.width > 0 && end_clip.height > 0)
    gtk_paint_layout (style,
                      gtk_widget_get_window (widget),
                      GTK_STATE_NORMAL,
                      FALSE,
                      &end_clip,
                      widget,
                      "progressbar",
                      x, y,
                      layout);

  gtk_paint_layout (style,
                    gtk_widget_get_window (widget),
                    GTK_STATE_PRELIGHT,
                    FALSE,
                    &prelight_clip,
                    widget,
                    "progressbar",
                    x, y,
                    layout);

  g_object_unref (layout);
  g_free (buf);
}

static void
gtk_progress_bar_paint (GtkProgressBar *pbar)
{
  GtkProgressBarPrivate *priv = pbar->priv;
  GtkAllocation allocation;
  GtkWidget *widget = GTK_WIDGET (pbar);
  GtkOrientation orientation;
  gboolean inverted;
  GtkStyle *style;

  style = gtk_widget_get_style (widget);
  gtk_widget_get_allocation (widget, &allocation);

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

  gtk_paint_box (style,
                 gtk_widget_get_window (widget),
                 GTK_STATE_NORMAL, GTK_SHADOW_IN,
                 NULL, widget, "trough",
                 0, 0,
                 allocation.width,
                 allocation.height);

  if (priv->activity_mode)
    {
      gtk_progress_bar_paint_activity (pbar, orientation, inverted);

      if (priv->show_text)
        {
          gint offset;
          gint amount;

          gtk_progress_bar_get_activity (pbar, orientation, &offset, &amount);
          gtk_progress_bar_paint_text (pbar, offset, amount, orientation, inverted);
        }
    }
  else
    {
      gint amount;
      gint space;

      if (orientation == GTK_ORIENTATION_HORIZONTAL)
        space = allocation.width - 2 * style->xthickness;
      else
        space = allocation.height - 2 * style->ythickness;

      amount = space * gtk_progress_bar_get_fraction (pbar);

      gtk_progress_bar_paint_continuous (pbar, amount, orientation, inverted);

      if (priv->show_text)
        gtk_progress_bar_paint_text (pbar, -1, amount, orientation, inverted);
    }
}

static void
gtk_progress_bar_set_activity_mode (GtkProgressBar *pbar,
                                    gboolean        activity_mode)
{
  GtkProgressBarPrivate *priv = pbar->priv;

  activity_mode = !!activity_mode;

  if (priv->activity_mode != activity_mode)
    {
      priv->activity_mode = activity_mode;

      if (priv->activity_mode)
        gtk_progress_bar_act_mode_enter (pbar);

      if (gtk_widget_is_drawable (GTK_WIDGET (pbar)))
        gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

/**
 * gtk_progress_bar_set_fraction:
 * @pbar: a #GtkProgressBar
 * @fraction: fraction of the task that's been completed
 *
 * Causes the progress bar to "fill in" the given fraction
 * of the bar. The fraction should be between 0.0 and 1.0,
 * inclusive.
 *
 **/
void
gtk_progress_bar_set_fraction (GtkProgressBar *pbar,
                               gdouble         fraction)
{
  GtkProgressBarPrivate* priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;

  priv->fraction = fraction;
  gtk_progress_bar_set_activity_mode (pbar, FALSE);
  gtk_progress_bar_real_update (pbar);

  g_object_notify (G_OBJECT (pbar), "fraction");
}

/**
 * gtk_progress_bar_pulse:
 * @pbar: a #GtkProgressBar
 *
 * Indicates that some progress is made, but you don't know how much.
 * Causes the progress bar to enter "activity mode," where a block
 * bounces back and forth. Each call to gtk_progress_bar_pulse()
 * causes the block to move by a little bit (the amount of movement
 * per pulse is determined by gtk_progress_bar_set_pulse_step()).
 **/
void
gtk_progress_bar_pulse (GtkProgressBar *pbar)
{
  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  gtk_progress_bar_set_activity_mode (pbar, TRUE);
  gtk_progress_bar_real_update (pbar);
}

/**
 * gtk_progress_bar_set_text:
 * @pbar: a #GtkProgressBar
 * @text: (allow-none): a UTF-8 string, or %NULL
 *
 * Causes the given @text to appear superimposed on the progress bar.
 **/
void
gtk_progress_bar_set_text (GtkProgressBar *pbar,
                           const gchar    *text)
{
  GtkProgressBarPrivate *priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;

  g_free (priv->text);
  priv->text = text && *text ? g_strdup (text) : NULL;

  if (gtk_widget_is_drawable (GTK_WIDGET (pbar)))
    gtk_widget_queue_resize (GTK_WIDGET (pbar));

  g_object_notify (G_OBJECT (pbar), "text");
}

/**
 * gtk_progress_bar_set_show_text:
 * @pbar: a #GtkProgressBar
 * @show_text: whether to show superimposed text
 *
 * Sets whether the progressbar will show text superimposed
 * over the bar. The shown text is either the value of
 * the #GtkProgressBar::text property or, if that is %NULL,
 * the #GtkProgressBar::fraction value, as a percentage.
 *
 * Since: 3.0
 */
void
gtk_progress_bar_set_show_text (GtkProgressBar *pbar,
                                gboolean        show_text)
{
  GtkProgressBarPrivate *priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;

  show_text = !!show_text;

  if (priv->show_text != show_text)
    {
      priv->show_text = show_text;

      if (gtk_widget_is_drawable (GTK_WIDGET (pbar)))
        gtk_widget_queue_resize (GTK_WIDGET (pbar));

      g_object_notify (G_OBJECT (pbar), "show-text");
    }
}

/**
 * gtk_progress_bar_get_show_text:
 * @pbar: a #GtkProgressBar
 *
 * Gets the value of the #GtkProgressBar::show-text property.
 * See gtk_progress_bar_set_show_text().
 *
 * Returns: %TRUE if text is shown in the progress bar
 *
 * Since: 3.0
 */
gboolean
gtk_progress_bar_get_show_text (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), FALSE);

  return pbar->priv->show_text;
}

/**
 * gtk_progress_bar_set_pulse_step:
 * @pbar: a #GtkProgressBar
 * @fraction: fraction between 0.0 and 1.0
 *
 * Sets the fraction of total progress bar length to move the
 * bouncing block for each call to gtk_progress_bar_pulse().
 **/
void
gtk_progress_bar_set_pulse_step (GtkProgressBar *pbar,
                                 gdouble         fraction)
{
  GtkProgressBarPrivate *priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;

  priv->pulse_fraction = fraction;

  g_object_notify (G_OBJECT (pbar), "pulse-step");
}

static void
gtk_progress_bar_set_orientation (GtkProgressBar *pbar,
                                  GtkOrientation  orientation)
{
  GtkProgressBarPrivate *priv = pbar->priv;

  if (priv->orientation != orientation)
    {
      priv->orientation = orientation;

      if (gtk_widget_is_drawable (GTK_WIDGET (pbar)))
        gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

/**
 * gtk_progress_bar_set_inverted:
 * @pbar: a #GtkProgressBar
 * @inverted: %TRUE to invert the progress bar
 *
 * Progress bars normally grow from top to bottom or left to right.
 * Inverted progress bars grow in the opposite direction.
 */
void
gtk_progress_bar_set_inverted (GtkProgressBar *pbar,
                               gboolean        inverted)
{
  GtkProgressBarPrivate *priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));

  priv = pbar->priv;

  if (priv->inverted != inverted)
    {
      priv->inverted = inverted;

      if (gtk_widget_is_drawable (GTK_WIDGET (pbar)))
        gtk_widget_queue_resize (GTK_WIDGET (pbar));

      g_object_notify (G_OBJECT (pbar), "inverted");
    }
}

/**
 * gtk_progress_bar_get_text:
 * @pbar: a #GtkProgressBar
 *
 * Retrieves the text displayed superimposed on the progress bar,
 * if any, otherwise %NULL. The return value is a reference
 * to the text, not a copy of it, so will become invalid
 * if you change the text in the progress bar.
 *
 * Return value: text, or %NULL; this string is owned by the widget
 * and should not be modified or freed.
 **/
G_CONST_RETURN gchar*
gtk_progress_bar_get_text (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), NULL);

  return pbar->priv->text;
}

/**
 * gtk_progress_bar_get_fraction:
 * @pbar: a #GtkProgressBar
 *
 * Returns the current fraction of the task that's been completed.
 *
 * Return value: a fraction from 0.0 to 1.0
 **/
gdouble
gtk_progress_bar_get_fraction (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), 0);

  return pbar->priv->fraction;
}

/**
 * gtk_progress_bar_get_pulse_step:
 * @pbar: a #GtkProgressBar
 *
 * Retrieves the pulse step set with gtk_progress_bar_set_pulse_step()
 *
 * Return value: a fraction from 0.0 to 1.0
 **/
gdouble
gtk_progress_bar_get_pulse_step (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), 0);

  return pbar->priv->pulse_fraction;
}

/**
 * gtk_progress_bar_get_inverted:
 * @pbar: a #GtkProgressBar
 *
 * Gets the value set by gtk_progress_bar_set_inverted()
 *
 * Return value: %TRUE if the progress bar is inverted
 */
gboolean
gtk_progress_bar_get_inverted (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), FALSE);

  return pbar->priv->inverted;
}

/**
 * gtk_progress_bar_set_ellipsize:
 * @pbar: a #GtkProgressBar
 * @mode: a #PangoEllipsizeMode
 *
 * Sets the mode used to ellipsize (add an ellipsis: "...") the text
 * if there is not enough space to render the entire string.
 *
 * Since: 2.6
 **/
void
gtk_progress_bar_set_ellipsize (GtkProgressBar     *pbar,
                                PangoEllipsizeMode  mode)
{
  GtkProgressBarPrivate *priv;

  g_return_if_fail (GTK_IS_PROGRESS_BAR (pbar));
  g_return_if_fail (mode >= PANGO_ELLIPSIZE_NONE &&
                    mode <= PANGO_ELLIPSIZE_END);

  priv = pbar->priv;

  if ((PangoEllipsizeMode)priv->ellipsize != mode)
    {
      priv->ellipsize = mode;

      g_object_notify (G_OBJECT (pbar), "ellipsize");
      gtk_widget_queue_resize (GTK_WIDGET (pbar));
    }
}

/**
 * gtk_progress_bar_get_ellipsize:
 * @pbar: a #GtkProgressBar
 *
 * Returns the ellipsizing position of the progressbar.
 * See gtk_progress_bar_set_ellipsize().
 *
 * Return value: #PangoEllipsizeMode
 *
 * Since: 2.6
 **/
PangoEllipsizeMode
gtk_progress_bar_get_ellipsize (GtkProgressBar *pbar)
{
  g_return_val_if_fail (GTK_IS_PROGRESS_BAR (pbar), PANGO_ELLIPSIZE_NONE);

  return pbar->priv->ellipsize;
}