2 * Sixth 3D engine. Copyright ©2012-2018, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 3 of the GNU Lesser General Public License
6 * or later as published by the Free Software Foundation.
10 package eu.svjatoslav.sixth.e3d.gui;
12 public interface ViewRenderListener {
15 * Notifies that it is about time to render next frame and
16 * allows listener to do any related processing that it needs to.
18 * Each {@link ViewRenderListener} will be notified exactly once before every frame is rendered.
20 * {@link ViewRenderListener} can determine if frame repaint is actually
21 * needed from its perspective. Frame will be rendered only if at least one listener says yes.
23 * @return <code>true</code> if underlying view shall be re-rendered. If at least one of the view update listeners
24 * returns <code>true</code>, view is re-rendered.
26 boolean beforeRender(ViewPanel viewPanel, final int millisecondsSinceLastFrame);