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/*
* This file is part of gitg
*
* Copyright (C) 2016 - Jesse van den Kieboom
*
* gitg 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.
*
* gitg 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 gitg. If not, see <http://www.gnu.org/licenses/>.
*/
class Gitg.DiffImageComposite : Gtk.DrawingArea
{
public Gitg.DiffImageSurfaceCache cache { get; set; }
private void get_natural_size(out int image_width, out int image_height)
{
var pixbuf = cache.old_pixbuf;
if (pixbuf == null)
{
image_width = 0;
image_height = 0;
return;
}
var window = get_window();
double xscale = 1, yscale = 1;
if (window != null)
{
cache.get_old_surface(get_window()).get_device_scale(out xscale, out yscale);
}
image_width = (int)(pixbuf.get_width() / xscale);
image_height = (int)(pixbuf.get_height() / yscale);
}
protected void get_sizing(int width, out int image_width, out int image_height)
{
get_natural_size(out image_width, out image_height);
// Scale down to fit in width
if (image_width > width)
{
image_height *= width / image_width;
image_width = width;
}
}
protected override void get_preferred_width(out int minimum_width, out int natural_width)
{
int natural_height;
get_natural_size(out natural_width, out natural_height);
minimum_width = 0;
}
protected override void get_preferred_height_for_width(int width, out int minimum_height, out int natural_height)
{
int image_width, image_height;
get_sizing(width, out image_width, out image_height);
minimum_height = image_height;
natural_height = image_height;
}
protected override Gtk.SizeRequestMode get_request_mode()
{
return Gtk.SizeRequestMode.HEIGHT_FOR_WIDTH;
}
protected override bool draw(Cairo.Context cr)
{
Gtk.Allocation alloc;
get_allocation(out alloc);
var ctx = get_style_context();
ctx.render_background(cr, alloc.x, alloc.y, alloc.width, alloc.height);
return true;
}
protected override void realize()
{
base.realize();
queue_resize();
}
}
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