mirror of
https://gitlab.gnome.org/GNOME/gitg
synced 2024-06-30 23:29:33 +00:00
84 lines
1.8 KiB
Vala
84 lines
1.8 KiB
Vala
/*
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* This file is part of gitg
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*
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* Copyright (C) 2016 - Jesse van den Kieboom
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*
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* gitg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* gitg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gitg. If not, see <http://www.gnu.org/licenses/>.
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*/
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class Gitg.DiffImageOverlay : DiffImageComposite
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{
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private double d_alpha;
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public double alpha
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{
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get { return d_alpha; }
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set
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{
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var newalpha = double.max(0, double.min(value, 1));
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if (newalpha != d_alpha)
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{
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d_alpha = newalpha;
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queue_draw();
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}
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}
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}
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construct
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{
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alpha = 0.5;
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}
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protected override bool draw(Cairo.Context cr)
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{
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base.draw(cr);
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var window = get_window();
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Gtk.Allocation alloc;
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get_allocation(out alloc);
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int image_width, image_height;
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get_sizing(alloc.width, out image_width, out image_height);
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var old_surface = cache.get_old_surface(window);
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var new_surface = cache.get_new_surface(window);
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int x = (alloc.width - image_width) / 2;
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int y = 0;
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if (old_surface != null && d_alpha != 1)
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{
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cr.set_source_surface(old_surface, x, y);
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cr.paint_with_alpha(1 - d_alpha);
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}
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if (new_surface != null && d_alpha != 0)
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{
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cr.set_source_surface(new_surface, x, y);
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cr.paint_with_alpha(d_alpha);
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}
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return true;
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}
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protected override void realize()
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{
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base.realize();
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queue_resize();
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}
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}
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