initial skeleton for a Grid canvas item

1 files changed, 71 insertions, 0 deletions

diff --git a/libs/canvas/canvas/grid.h b/libs/canvas/canvas/grid.h
new file mode 100644
index 0000000000..a13cdf0a22
--- /dev/null
+++ b/libs/canvas/canvas/grid.h
@@ -0,0 +1,71 @@
+/*
+    Copyright (C) 2018 Paul Davis
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __CANVAS_GRID_H__
+#define __CANVAS_GRID_H__
+
+#include "canvas/item.h"
+
+namespace ArdourCanvas
+{
+
+class Rectangle;
+
+/** Canvas container that renders its children in a grid layout
+ */
+class LIBCANVAS_API Grid : public Item
+{
+public:
+	Grid (Canvas *);
+	Grid (Item *);
+	Grid (Item *, Duple const & position);
+
+	void set_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 (Color c)  { set_outline_color (c); }
+
+	void place(Item*, Duple coord);
+
+	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 spacing;
+	double top_padding, right_padding, bottom_padding, left_padding;
+	double top_margin, right_margin, bottom_margin, left_margin;
+
+	void child_changed ();
+  private:
+	Rectangle *self;
+	bool collapse_on_hide;
+	bool homogenous;
+
+	void reset_self ();
+	void reposition_children ();
+};
+
+}
+
+#endif