drawingarea.h

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/*
    This file is part of darktable,
    Copyright (C) 2014-2020 darktable developers.
 
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    darktable 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 General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <glib-object.h>
#include <gtk/gtk.h>
 
G_BEGIN_DECLS
 
#define DTGTK_TYPE_DRAWING_AREA (dtgtk_drawing_area_get_type())
#define DTGTK_DRAWING_AREA(obj)                                                                              \
  (G_TYPE_CHECK_INSTANCE_CAST((obj), DTGTK_TYPE_DRAWING_AREA, GtkDarktableDrawingArea))
#define DTGTK_IS_DRAWING_AREA(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), DTGTK_TYPE_DRAWING_AREA))
#define DTGTK_DRAWING_AREA_CLASS(klass)                                                                      \
  (G_TYPE_CHECK_CLASS_CAST((klass), DTGTK_TYPE_DRAWING_AREA, GtkDarktableDrawingAreaClass))
#define DTGTK_IS_DRAWING_AREA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), DTGTK_TYPE_DRAWING_AREA))
#define DTGTK_DRAWING_AREA_GET_CLASS(obj)                                                                    \
  (G_TYPE_INSTANCE_GET_CLASS((obj), DTGTK_TYPE_DRAWING_AREA, GtkDarktableDrawingAreaClass))
 
typedef struct _GtkDarktableDrawingArea
{
  GtkDrawingArea area;
 
  /*
   * drawing area aspect ratio.
   * width = as much as possible
   * height = width * aspect
   *
   * e.g. 1   => square
   *      0.5 => height is 2 times smaller than width
   *      2   => height is 2 times bigger than width
   */
  double aspect;
} GtkDarktableDrawingArea;
 
typedef struct _GtkDarktableDrawingAreaClass
{
  GtkDrawingAreaClass parent_class;
} GtkDarktableDrawingAreaClass;
 
GType dtgtk_drawing_area_get_type(void);
 
GtkWidget *dtgtk_drawing_area_new_with_aspect_ratio(double aspect);
void dtgtk_drawing_area_set_aspect_ratio(GtkWidget *w, double aspect);
 
G_END_DECLS
 
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