2 * Sixth 3D engine. Author: Svjatoslav Agejenko.
3 * This project is released under Creative Commons Zero (CC0) license.
8 package eu.svjatoslav.sixth.e3d.gui;
10 public interface ViewRenderListener {
13 * Notifies that it is about time to render next frame and
14 * allows listener to do any related processing that it needs to.
16 * Each {@link ViewRenderListener} will be notified exactly once before every frame is rendered.
18 * {@link ViewRenderListener} can determine if frame repaint is actually
19 * needed from its perspective. Frame will be rendered only if at least one listener says yes.
21 * @return <code>true</code> if underlying view shall be re-rendered. If at least one of the view update listeners
22 * returns <code>true</code>, view is re-rendered.
24 boolean beforeRender(ViewPanel viewPanel, final int millisecondsSinceLastFrame);