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diff --git a/app/widgets/gimpdasheditor.h b/app/widgets/gimpdasheditor.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpdasheditor.h
+ * Copyright (C) 2003 Simon Budig <simon@gimp.org>
+ *
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_DASH_EDITOR_H__
+#define __GIMP_DASH_EDITOR_H__
+
+
+#define GIMP_TYPE_DASH_EDITOR (gimp_dash_editor_get_type ())
+#define GIMP_DASH_EDITOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_DASH_EDITOR, GimpDashEditor))
+#define GIMP_DASH_EDITOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_DASH_EDITOR, GimpDashEditorClass))
+#define GIMP_IS_DASH_EDITOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_DASH_EDITOR))
+#define GIMP_IS_DASH_EDITOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_DASH_EDITOR))
+#define GIMP_DASH_EDITOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_DASH_EDITOR, GimpDashEditorClass))
+
+
+typedef struct _GimpDashEditorClass GimpDashEditorClass;
+
+struct _GimpDashEditor
+{
+ GtkDrawingArea parent_instance;
+
+ GimpStrokeOptions *stroke_options;
+ gdouble dash_length;
+
+ /* GUI stuff */
+ gint n_segments;
+ gboolean *segments;
+
+ /* coordinates of the first block main dash pattern */
+ gint x0;
+ gint y0;
+ gint block_width;
+ gint block_height;
+
+ gboolean edit_mode;
+ gint edit_button_x0;
+};
+
+struct _GimpDashEditorClass
+{
+ GtkDrawingAreaClass parent_class;
+};
+
+
+GType gimp_dash_editor_get_type (void) G_GNUC_CONST;
+
+GtkWidget * gimp_dash_editor_new (GimpStrokeOptions *stroke_options);
+
+void gimp_dash_editor_shift_left (GimpDashEditor *editor);
+void gimp_dash_editor_shift_right (GimpDashEditor *editor);
+
+
+#endif /* __GIMP_DASH_EDITOR_H__ */