grid.h

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/*
 * Copyright (C) 2017 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __CANVAS_GRID_H__
#define __CANVAS_GRID_H__
 
#include <map>
 
#include "canvas/item.h"
 
namespace ArdourCanvas
{
 
class Rectangle;
 
class LIBCANVAS_API Grid : public Item
{
public:
        Grid (Canvas *);
        Grid (Item *);
        Grid (Item *, Duple const & position);
 
        void set_row_spacing (double s);
        void set_col_spacing (double s);
 
        void set_padding (double top, double right = -1.0, double bottom = -1.0, double left = -1.0);
        void set_margin (double top, double right = -1.0, double bottom = -1.0, double left = -1.0);
 
        /* aliases so that CSS box model terms work */
        void set_border_width (double w) { set_outline_width (w); }
        void set_border_color (Gtkmm2ext::Color c)  { set_outline_color (c); }
 
        void place (Item*, double x, double y, double col_span = 1, double row_span = 1);
 
        void set_collapse_on_hide (bool);
        void set_homogenous (bool);
 
        void compute_bounding_box () const;
        void render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const;
 
  protected:
        double row_spacing;
        double col_spacing;
        double top_padding, right_padding, bottom_padding, left_padding;
        double top_margin, right_margin, bottom_margin, left_margin;
 
        void child_changed (bool bbox_changed);
  private:
        struct ChildInfo {
                Item* item;
                double x;
                double y;
                double col_span;
                double row_span;
        };
 
        typedef std::map<Item*,ChildInfo> CoordsByItem;
        CoordsByItem coords_by_item;
 
        Rectangle *bg;
        bool collapse_on_hide;
        bool homogenous;
 
        void reset_bg ();
        void reposition_children ();
};
 
}
 
#endif