gtk2/gtk/gtkcolorswatch.c

/* GTK - The GIMP Toolkit
 * Copyright (C) 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/>.
 */

#include "config.h"

#include "gtkcolorswatchprivate.h"

#include "gtkcolorchooserprivate.h"
#include "gtkdnd.h"
#include "gtkicontheme.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtkmenushell.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkrenderprivate.h"
#include "gtkiconhelperprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcsscustomgadgetprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkstylecontextprivate.h"
#include "a11y/gtkcolorswatchaccessibleprivate.h"


/*
 * GtkColorSwatch has two CSS nodes, the main one named colorswatch
 * and a subnode named overlay. The main node gets the .light or .dark
 * style classes added depending on the brightness of the color that
 * the swatch is showing.
 *
 * The color swatch has the .activatable style class by default. It can
 * be removed for non-activatable swatches.
 */

struct _GtkColorSwatchPrivate
{
  GdkRGBA color;
  gdouble radius[4];
  gchar *icon;
  guint    has_color        : 1;
  guint    use_alpha        : 1;
  guint    selectable       : 1;
  guint    has_menu         : 1;

  GdkWindow *event_window;

  GtkGesture *long_press_gesture;
  GtkGesture *multipress_gesture;
  GtkCssGadget *gadget;
  GtkCssGadget *overlay_gadget;

  GtkWidget *popover;
};

enum
{
  PROP_ZERO,
  PROP_RGBA,
  PROP_SELECTABLE,
  PROP_HAS_MENU
};

enum
{
  ACTIVATE,
  CUSTOMIZE,
  LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];


G_DEFINE_TYPE_WITH_PRIVATE (GtkColorSwatch, gtk_color_swatch, GTK_TYPE_WIDGET)

static gboolean
swatch_draw (GtkWidget *widget,
             cairo_t   *cr)
{
  gtk_css_gadget_draw (GTK_COLOR_SWATCH (widget)->priv->gadget, cr);

  return FALSE;
}

#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)

static gboolean
gtk_color_swatch_render (GtkCssGadget *gadget,
                         cairo_t      *cr,
                         int           x,
                         int           y,
                         int           width,
                         int           height,
                         gpointer      data)
{
  GtkWidget *widget;
  GtkColorSwatch *swatch;
  GtkStyleContext *context;

  widget = gtk_css_gadget_get_owner (gadget);
  swatch = GTK_COLOR_SWATCH (widget);
  context = gtk_widget_get_style_context (widget);

  if (swatch->priv->has_color)
    {
      cairo_pattern_t *pattern;
      cairo_matrix_t matrix;
      GtkAllocation allocation, border_allocation;

      gtk_widget_get_allocation (widget, &allocation);
      gtk_css_gadget_get_border_allocation (gadget, &border_allocation, NULL);

      border_allocation.x -= allocation.x;
      border_allocation.y -= allocation.y;

      gtk_render_content_path (context, cr,
                               border_allocation.x,
                               border_allocation.y,
                               border_allocation.width,
                               border_allocation.height);

      if (swatch->priv->use_alpha)
        {
          cairo_save (cr);

          cairo_clip_preserve (cr);

          cairo_set_source_rgb (cr, 0.33, 0.33, 0.33);
          cairo_fill_preserve (cr);

          pattern = _gtk_color_chooser_get_checkered_pattern ();
          cairo_matrix_init_scale (&matrix, 0.125, 0.125);
          cairo_pattern_set_matrix (pattern, &matrix);

          cairo_set_source_rgb (cr, 0.66, 0.66, 0.66);
          cairo_mask (cr, pattern);
          cairo_pattern_destroy (pattern);

          cairo_restore (cr);

          gdk_cairo_set_source_rgba (cr, &swatch->priv->color);
        }
      else
        {
          cairo_set_source_rgb (cr,
                                swatch->priv->color.red,
                                swatch->priv->color.green,
                                swatch->priv->color.blue);
        }

      cairo_fill (cr);
    }

  gtk_css_gadget_draw (swatch->priv->overlay_gadget, cr);

  return gtk_widget_has_visible_focus (widget);
}

static void
drag_set_color_icon (GdkDragContext *context,
                     const GdkRGBA  *color)
{
  cairo_surface_t *surface;
  cairo_t *cr;

  surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 48, 32);
  cr = cairo_create (surface);
  gdk_cairo_set_source_rgba (cr, color);
  cairo_paint (cr);

  cairo_surface_set_device_offset (surface, -4, -4);
  gtk_drag_set_icon_surface (context, surface);

  cairo_destroy (cr);
  cairo_surface_destroy (surface);
}

static void
swatch_drag_begin (GtkWidget      *widget,
                   GdkDragContext *context)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
  GdkRGBA color;

  gtk_color_swatch_get_rgba (swatch, &color);
  drag_set_color_icon (context, &color);
}

static void
swatch_drag_data_get (GtkWidget        *widget,
                      GdkDragContext   *context,
                      GtkSelectionData *selection_data,
                      guint             info,
                      guint             time)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
  guint16 vals[4];
  GdkRGBA color;

  gtk_color_swatch_get_rgba (swatch, &color);

  vals[0] = color.red * 0xffff;
  vals[1] = color.green * 0xffff;
  vals[2] = color.blue * 0xffff;
  vals[3] = color.alpha * 0xffff;

  gtk_selection_data_set (selection_data,
                          gdk_atom_intern_static_string ("application/x-color"),
                          16, (guchar *)vals, 8);
}

static void
swatch_drag_data_received (GtkWidget        *widget,
                           GdkDragContext   *context,
                           gint              x,
                           gint              y,
                           GtkSelectionData *selection_data,
                           guint             info,
                           guint             time)
{
  gint length;
  guint16 *vals;
  GdkRGBA color;

  length = gtk_selection_data_get_length (selection_data);

  if (length < 0)
    return;

  /* We accept drops with the wrong format, since the KDE color
   * chooser incorrectly drops application/x-color with format 8.
   */
  if (length != 8)
    {
      g_warning ("Received invalid color data");
      return;
    }

  vals = (guint16 *) gtk_selection_data_get_data (selection_data);

  color.red   = (gdouble)vals[0] / 0xffff;
  color.green = (gdouble)vals[1] / 0xffff;
  color.blue  = (gdouble)vals[2] / 0xffff;
  color.alpha = (gdouble)vals[3] / 0xffff;

  gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (widget), &color);
}

static void
gtk_color_swatch_measure (GtkCssGadget   *gadget,
                          GtkOrientation  orientation,
                          int             for_size,
                          int            *minimum,
                          int            *natural,
                          int            *minimum_baseline,
                          int            *natural_baseline,
                          gpointer        unused)
{
  GtkWidget *widget;
  GtkColorSwatch *swatch;
  gint w, h, min;

  widget = gtk_css_gadget_get_owner (gadget);
  swatch = GTK_COLOR_SWATCH (widget);

  gtk_css_gadget_get_preferred_size (swatch->priv->overlay_gadget,
                                     orientation,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);

  gtk_widget_get_size_request (widget, &w, &h);
  if (orientation == GTK_ORIENTATION_HORIZONTAL)
    min = w < 0 ? 48 : w;
  else
    min = h < 0 ? 32 : h;

  *minimum = MAX (*minimum, min);
  *natural = MAX (*natural, min);
}

static gboolean
swatch_key_press (GtkWidget   *widget,
                  GdkEventKey *event)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);

  if (event->keyval == GDK_KEY_space ||
      event->keyval == GDK_KEY_Return ||
      event->keyval == GDK_KEY_ISO_Enter||
      event->keyval == GDK_KEY_KP_Enter ||
      event->keyval == GDK_KEY_KP_Space)
    {
      if (swatch->priv->has_color &&
          swatch->priv->selectable &&
          (gtk_widget_get_state_flags (widget) & GTK_STATE_FLAG_SELECTED) == 0)
        gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_SELECTED, FALSE);
      else
        g_signal_emit (swatch, signals[ACTIVATE], 0);
      return TRUE;
    }

  if (GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->key_press_event (widget, event))
    return TRUE;

  return FALSE;
}

static gboolean
swatch_enter_notify (GtkWidget        *widget,
                     GdkEventCrossing *event)
{
  gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_PRELIGHT, FALSE);

  return FALSE;
}

static gboolean
swatch_leave_notify (GtkWidget        *widget,
                     GdkEventCrossing *event)
{
  gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_PRELIGHT);

  return FALSE;
}

static void
emit_customize (GtkColorSwatch *swatch)
{
  g_signal_emit (swatch, signals[CUSTOMIZE], 0);
}

static void
do_popup (GtkColorSwatch *swatch)
{
  if (swatch->priv->popover == NULL)
    {
      GtkWidget *box;
      GtkWidget *item;

      swatch->priv->popover = gtk_popover_new (GTK_WIDGET (swatch));
      box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
      gtk_container_add (GTK_CONTAINER (swatch->priv->popover), box);
      g_object_set (box, "margin", 10, NULL);
      item = g_object_new (GTK_TYPE_MODEL_BUTTON,
                           "text", _("C_ustomize"),
                           NULL);
      g_signal_connect_swapped (item, "clicked",
                                G_CALLBACK (emit_customize), swatch);
      gtk_container_add (GTK_CONTAINER (box), item);
      gtk_widget_show_all (box);
    }

  gtk_popover_popup (GTK_POPOVER (swatch->priv->popover));
}

static gboolean
swatch_primary_action (GtkColorSwatch *swatch)
{
  GtkWidget *widget = (GtkWidget *)swatch;
  GtkStateFlags flags;

  flags = gtk_widget_get_state_flags (widget);
  if (!swatch->priv->has_color)
    {
      g_signal_emit (swatch, signals[ACTIVATE], 0);
      return TRUE;
    }
  else if (swatch->priv->selectable &&
           (flags & GTK_STATE_FLAG_SELECTED) == 0)
    {
      gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_SELECTED, FALSE);
      return TRUE;
    }

  return FALSE;
}

static void
hold_action (GtkGestureLongPress *gesture,
             gdouble              x,
             gdouble              y,
             GtkColorSwatch      *swatch)
{
  do_popup (swatch);
  gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
}

static void
tap_action (GtkGestureMultiPress *gesture,
            gint                  n_press,
            gdouble               x,
            gdouble               y,
            GtkColorSwatch       *swatch)
{
  guint button;

  button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));

  if (button == GDK_BUTTON_PRIMARY)
    {
      if (n_press == 1)
        swatch_primary_action (swatch);
      else if (n_press > 1)
        g_signal_emit (swatch, signals[ACTIVATE], 0);
    }
  else if (button == GDK_BUTTON_SECONDARY)
    {
      if (swatch->priv->has_color && swatch->priv->has_menu)
        do_popup (swatch);
    }
}

static void
swatch_map (GtkWidget *widget)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);

  GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->map (widget);

  if (swatch->priv->event_window)
    gdk_window_show (swatch->priv->event_window);
}

static void
swatch_unmap (GtkWidget *widget)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);

  if (swatch->priv->event_window)
    gdk_window_hide (swatch->priv->event_window);

  GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->unmap (widget);
}

static void
swatch_realize (GtkWidget *widget)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
  GtkAllocation allocation;
  GdkWindow *window;
  GdkWindowAttr attributes;
  gint attributes_mask;

  gtk_widget_get_allocation (widget, &allocation);
  gtk_widget_set_realized (widget, TRUE);

  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_ONLY;
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= GDK_BUTTON_PRESS_MASK
                           | GDK_BUTTON_RELEASE_MASK
                           | GDK_ENTER_NOTIFY_MASK
                           | GDK_LEAVE_NOTIFY_MASK
                           | GDK_TOUCH_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y;

  window = gtk_widget_get_parent_window (widget);
  gtk_widget_set_window (widget, window);
  g_object_ref (window);

  swatch->priv->event_window = gdk_window_new (window, &attributes, attributes_mask);
  gtk_widget_register_window (widget, swatch->priv->event_window);
}

static void
swatch_unrealize (GtkWidget *widget)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);

  if (swatch->priv->event_window)
    {
      gtk_widget_unregister_window (widget, swatch->priv->event_window);
      gdk_window_destroy (swatch->priv->event_window);
      swatch->priv->event_window = NULL;
    }

  GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->unrealize (widget);
}

static void
swatch_size_allocate (GtkWidget     *widget,
                      GtkAllocation *allocation)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
  GtkAllocation clip, clip2;

  gtk_widget_set_allocation (widget, allocation);

  gtk_css_gadget_allocate (swatch->priv->gadget,
                           allocation,
                           gtk_widget_get_allocated_baseline (widget),
                           &clip);
  gtk_css_gadget_allocate (swatch->priv->overlay_gadget,
                           allocation,
                           gtk_widget_get_allocated_baseline (widget),
                           &clip2);

  gdk_rectangle_union (&clip, &clip2, &clip);

  gtk_widget_set_clip (widget, &clip);

  if (gtk_widget_get_realized (widget))
    {
      GtkAllocation border_allocation;
      gtk_css_gadget_get_border_allocation(swatch->priv->gadget, &border_allocation, NULL);
      gdk_window_move_resize (swatch->priv->event_window,
                              border_allocation.x,
                              border_allocation.y,
                              border_allocation.width,
                              border_allocation.height);
    }

}

static void
swatch_get_preferred_width (GtkWidget *widget,
                            gint      *minimum,
                            gint      *natural)
{
  gtk_css_gadget_get_preferred_size (GTK_COLOR_SWATCH (widget)->priv->gadget,
                                     GTK_ORIENTATION_HORIZONTAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
}

static void
swatch_get_preferred_height (GtkWidget *widget,
                             gint      *minimum,
                             gint      *natural)
{
  gtk_css_gadget_get_preferred_size (GTK_COLOR_SWATCH (widget)->priv->gadget,
                                     GTK_ORIENTATION_VERTICAL,
                                     -1,
                                     minimum, natural,
                                     NULL, NULL);
}

static gboolean
swatch_popup_menu (GtkWidget *widget)
{
  do_popup (GTK_COLOR_SWATCH (widget));
  return TRUE;
}

static void
update_icon (GtkColorSwatch *swatch)
{
  GtkIconHelper *icon_helper = GTK_ICON_HELPER (swatch->priv->overlay_gadget);

  if (swatch->priv->icon)
    _gtk_icon_helper_set_icon_name (icon_helper, swatch->priv->icon, GTK_ICON_SIZE_BUTTON);
  else if (gtk_widget_get_state_flags (GTK_WIDGET (swatch)) & GTK_STATE_FLAG_SELECTED)
    _gtk_icon_helper_set_icon_name (icon_helper, "object-select-symbolic", GTK_ICON_SIZE_BUTTON);
  else
    _gtk_icon_helper_clear (icon_helper);
}

static void
swatch_state_flags_changed (GtkWidget     *widget,
                            GtkStateFlags  previous_state)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);

  gtk_css_gadget_set_state (swatch->priv->gadget, gtk_widget_get_state_flags (widget));
  gtk_css_gadget_set_state (swatch->priv->overlay_gadget, gtk_widget_get_state_flags (widget));

  update_icon (swatch);

  GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->state_flags_changed (widget, previous_state);
}

/* GObject implementation {{{1 */

static void
swatch_get_property (GObject    *object,
                     guint       prop_id,
                     GValue     *value,
                     GParamSpec *pspec)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);
  GdkRGBA color;

  switch (prop_id)
    {
    case PROP_RGBA:
      gtk_color_swatch_get_rgba (swatch, &color);
      g_value_set_boxed (value, &color);
      break;
    case PROP_SELECTABLE:
      g_value_set_boolean (value, gtk_color_swatch_get_selectable (swatch));
      break;
    case PROP_HAS_MENU:
      g_value_set_boolean (value, swatch->priv->has_menu);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
swatch_set_property (GObject      *object,
                     guint         prop_id,
                     const GValue *value,
                     GParamSpec   *pspec)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);

  switch (prop_id)
    {
    case PROP_RGBA:
      gtk_color_swatch_set_rgba (swatch, g_value_get_boxed (value));
      break;
    case PROP_SELECTABLE:
      gtk_color_swatch_set_selectable (swatch, g_value_get_boolean (value));
      break;
    case PROP_HAS_MENU:
      swatch->priv->has_menu = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
swatch_finalize (GObject *object)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);

  g_free (swatch->priv->icon);
  g_clear_object (&swatch->priv->gadget);
  g_clear_object (&swatch->priv->overlay_gadget);

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

static void
swatch_dispose (GObject *object)
{
  GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);

  if (swatch->priv->popover)
    {
      gtk_widget_destroy (swatch->priv->popover);
      swatch->priv->popover = NULL;
    }

  g_clear_object (&swatch->priv->long_press_gesture);
  g_clear_object (&swatch->priv->multipress_gesture);

  G_OBJECT_CLASS (gtk_color_swatch_parent_class)->dispose (object);
}

static void
gtk_color_swatch_class_init (GtkColorSwatchClass *class)
{
  GtkWidgetClass *widget_class = (GtkWidgetClass *)class;
  GObjectClass *object_class = (GObjectClass *)class;

  object_class->get_property = swatch_get_property;
  object_class->set_property = swatch_set_property;
  object_class->finalize = swatch_finalize;
  object_class->dispose = swatch_dispose;

  widget_class->get_preferred_width = swatch_get_preferred_width;
  widget_class->get_preferred_height = swatch_get_preferred_height;
  widget_class->draw = swatch_draw;
  widget_class->drag_begin = swatch_drag_begin;
  widget_class->drag_data_get = swatch_drag_data_get;
  widget_class->drag_data_received = swatch_drag_data_received;
  widget_class->key_press_event = swatch_key_press;
  widget_class->popup_menu = swatch_popup_menu;
  widget_class->enter_notify_event = swatch_enter_notify;
  widget_class->leave_notify_event = swatch_leave_notify;
  widget_class->realize = swatch_realize;
  widget_class->unrealize = swatch_unrealize;
  widget_class->map = swatch_map;
  widget_class->unmap = swatch_unmap;
  widget_class->size_allocate = swatch_size_allocate;
  widget_class->state_flags_changed = swatch_state_flags_changed;

  signals[ACTIVATE] =
    g_signal_new (I_("activate"),
                  GTK_TYPE_COLOR_SWATCH,
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (GtkColorSwatchClass, activate),
                  NULL, NULL, NULL, G_TYPE_NONE, 0);

  signals[CUSTOMIZE] =
    g_signal_new (I_("customize"),
                  GTK_TYPE_COLOR_SWATCH,
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (GtkColorSwatchClass, customize),
                  NULL, NULL, NULL, G_TYPE_NONE, 0);

  g_object_class_install_property (object_class, PROP_RGBA,
      g_param_spec_boxed ("rgba", P_("RGBA Color"), P_("Color as RGBA"),
                          GDK_TYPE_RGBA, GTK_PARAM_READWRITE));
  g_object_class_install_property (object_class, PROP_SELECTABLE,
      g_param_spec_boolean ("selectable", P_("Selectable"), P_("Whether the swatch is selectable"),
                            TRUE, GTK_PARAM_READWRITE));
  g_object_class_install_property (object_class, PROP_HAS_MENU,
      g_param_spec_boolean ("has-menu", P_("Has Menu"), P_("Whether the swatch should offer customization"),
                            TRUE, GTK_PARAM_READWRITE));

  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_COLOR_SWATCH_ACCESSIBLE);
  gtk_widget_class_set_css_name (widget_class, "colorswatch");
}

static void
gtk_color_swatch_init (GtkColorSwatch *swatch)
{
  GtkCssNode *widget_node;

  swatch->priv = gtk_color_swatch_get_instance_private (swatch);
  swatch->priv->use_alpha = TRUE;
  swatch->priv->selectable = TRUE;
  swatch->priv->has_menu = TRUE;

  gtk_widget_set_can_focus (GTK_WIDGET (swatch), TRUE);
  gtk_widget_set_has_window (GTK_WIDGET (swatch), FALSE);

  swatch->priv->long_press_gesture = gtk_gesture_long_press_new (GTK_WIDGET (swatch));
  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (swatch->priv->long_press_gesture),
                                     TRUE);
  g_signal_connect (swatch->priv->long_press_gesture, "pressed",
                    G_CALLBACK (hold_action), swatch);

  swatch->priv->multipress_gesture = gtk_gesture_multi_press_new (GTK_WIDGET (swatch));
  gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (swatch->priv->multipress_gesture), 0);
  g_signal_connect (swatch->priv->multipress_gesture, "pressed",
                    G_CALLBACK (tap_action), swatch);

  widget_node = gtk_widget_get_css_node (GTK_WIDGET (swatch));
  swatch->priv->gadget = gtk_css_custom_gadget_new_for_node (widget_node,
                                                             GTK_WIDGET (swatch),
                                                             gtk_color_swatch_measure,
                                                             NULL,
                                                             gtk_color_swatch_render,
                                                             NULL,
                                                             NULL);
  gtk_css_gadget_add_class (swatch->priv->gadget, "activatable");

  swatch->priv->overlay_gadget = gtk_icon_helper_new_named ("overlay", GTK_WIDGET (swatch));
  _gtk_icon_helper_set_force_scale_pixbuf (GTK_ICON_HELPER (swatch->priv->overlay_gadget), TRUE);
  gtk_css_node_set_parent (gtk_css_gadget_get_node (swatch->priv->overlay_gadget), widget_node);

}

/* Public API {{{1 */

GtkWidget *
gtk_color_swatch_new (void)
{
  return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_SWATCH, NULL);
}

static const GtkTargetEntry dnd_targets[] = {
  { "application/x-color", 0 }
};

void
gtk_color_swatch_set_rgba (GtkColorSwatch *swatch,
                           const GdkRGBA  *color)
{
  GtkStyleContext *context;

  context = gtk_widget_get_style_context (GTK_WIDGET (swatch));

  if (!swatch->priv->has_color)
    {
      gtk_drag_source_set (GTK_WIDGET (swatch),
                           GDK_BUTTON1_MASK | GDK_BUTTON3_MASK,
                           dnd_targets, G_N_ELEMENTS (dnd_targets),
                           GDK_ACTION_COPY | GDK_ACTION_MOVE);
    }

  swatch->priv->has_color = TRUE;
  swatch->priv->color = *color;

  if (INTENSITY (swatch->priv->color.red, swatch->priv->color.green, swatch->priv->color.blue) > 0.5)
    {
      gtk_style_context_add_class (context, "light");
      gtk_style_context_remove_class (context, "dark");
    }
  else
    {
      gtk_style_context_add_class (context, "dark");
      gtk_style_context_remove_class (context, "light");
    }

  gtk_widget_queue_draw (GTK_WIDGET (swatch));
  g_object_notify (G_OBJECT (swatch), "rgba");
}

gboolean
gtk_color_swatch_get_rgba (GtkColorSwatch *swatch,
                           GdkRGBA        *color)
{
  if (swatch->priv->has_color)
    {
      color->red = swatch->priv->color.red;
      color->green = swatch->priv->color.green;
      color->blue = swatch->priv->color.blue;
      color->alpha = swatch->priv->color.alpha;
      return TRUE;
    }
  else
    {
      color->red = 1.0;
      color->green = 1.0;
      color->blue = 1.0;
      color->alpha = 1.0;
      return FALSE;
    }
}

void
gtk_color_swatch_set_icon (GtkColorSwatch *swatch,
                           const gchar    *icon)
{
  swatch->priv->icon = g_strdup (icon);
  update_icon (swatch);
  gtk_widget_queue_draw (GTK_WIDGET (swatch));
}

void
gtk_color_swatch_set_can_drop (GtkColorSwatch *swatch,
                               gboolean        can_drop)
{
  if (can_drop)
    {
      gtk_drag_dest_set (GTK_WIDGET (swatch),
                         GTK_DEST_DEFAULT_HIGHLIGHT |
                         GTK_DEST_DEFAULT_MOTION |
                         GTK_DEST_DEFAULT_DROP,
                         dnd_targets, G_N_ELEMENTS (dnd_targets),
                         GDK_ACTION_COPY);
    }
  else
    {
      gtk_drag_dest_unset (GTK_WIDGET (swatch));
    }
}

void
gtk_color_swatch_set_use_alpha (GtkColorSwatch *swatch,
                                gboolean        use_alpha)
{
  swatch->priv->use_alpha = use_alpha;
  gtk_widget_queue_draw (GTK_WIDGET (swatch));
}

void
gtk_color_swatch_set_selectable (GtkColorSwatch *swatch,
                                 gboolean selectable)
{
  if (selectable == swatch->priv->selectable)
    return;

  swatch->priv->selectable = selectable;
  g_object_notify (G_OBJECT (swatch), "selectable");
}

gboolean
gtk_color_swatch_get_selectable (GtkColorSwatch *swatch)
{
  return swatch->priv->selectable;
}

/* vim:set foldmethod=marker: */