/* GTK - The GIMP Toolkit
 * Copyright (C) 2021 Red Hat, Inc.
 *
 * Authors:
 * - Matthias Clasen <mclasen@redhat.com>
 *
 * 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 "gtkpanedhandleprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkrendericonprivate.h"
#include "gtkcssboxesprivate.h"
#include "gtkprivate.h"

#include "gtkpaned.h"


G_DEFINE_TYPE (GtkPanedHandle, gtk_paned_handle, GTK_TYPE_WIDGET);

static void
gtk_paned_handle_snapshot (GtkWidget   *widget,
                           GtkSnapshot *snapshot)
{
  GtkCssStyle *style = gtk_css_node_get_style (gtk_widget_get_css_node (widget));
  int width, height;

  width = gtk_widget_get_width (widget);
  height = gtk_widget_get_height (widget);

  if (width > 0 && height > 0)
    gtk_css_style_snapshot_icon (style, snapshot, width, height);
}

#define HANDLE_EXTRA_SIZE 6

static gboolean
gtk_paned_handle_contains (GtkWidget *widget,
                           double     x,
                           double     y)
{
  GtkWidget *paned;
  GtkCssBoxes boxes;
  graphene_rect_t area;

  gtk_css_boxes_init (&boxes, widget);

  graphene_rect_init_from_rect (&area, gtk_css_boxes_get_border_rect (&boxes));

  paned = gtk_widget_get_parent (widget);
  if (!gtk_paned_get_wide_handle (GTK_PANED (paned)))
    graphene_rect_inset (&area, - HANDLE_EXTRA_SIZE, - HANDLE_EXTRA_SIZE);

  return graphene_rect_contains_point (&area, &GRAPHENE_POINT_INIT (x, y));
}

static void
gtk_paned_handle_finalize (GObject *object)
{
  GtkPanedHandle *self = GTK_PANED_HANDLE (object);
  GtkWidget *widget;

  widget = _gtk_widget_get_first_child (GTK_WIDGET (self));
  while (widget != NULL)
    {
      GtkWidget *next = _gtk_widget_get_next_sibling (widget);

      gtk_widget_unparent (widget);

      widget = next;
    }

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

static void
gtk_paned_handle_class_init (GtkPanedHandleClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  object_class->finalize = gtk_paned_handle_finalize;

  widget_class->snapshot = gtk_paned_handle_snapshot;
  widget_class->contains = gtk_paned_handle_contains;

  gtk_widget_class_set_css_name (widget_class, I_("separator"));
}

static void
gtk_paned_handle_init (GtkPanedHandle *self)
{
}

GtkWidget *
gtk_paned_handle_new (void)
{
  return g_object_new (GTK_TYPE_PANED_HANDLE, NULL);
}