98 lines
2.8 KiB
Java
98 lines
2.8 KiB
Java
import java.applet.Applet;
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import java.awt.Graphics;
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import org.luaj.vm2.Globals;
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import org.luaj.vm2.LuaValue;
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import org.luaj.vm2.lib.jse.CoerceJavaToLua;
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import org.luaj.vm2.lib.jse.JsePlatform;
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/**
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* Simple Applet that forwards Applet lifecycle events to a lua script.
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*
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* <p>
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* On Applet.init() a script is loaded and executed, with the Applet instance as
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* the first argument. Initialization of the Applet UI can be done here.
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*
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* <p>
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* Other Applet lifecycle events are invoked when they are recieved, and
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* forwarded to methods in the global environment, if they exist. These are:
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* <ul>
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* <li>start() called when {@link Applet#start} is called.
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* <li>stop() called when {@link Applet#stop} is called.
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* <li>paint(graphics) called when {@link Applet#paint(Graphics)} is called. If
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* this is not defined as a function the superclass method will be called.
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* <li>update(graphics) called when {@link Applet#update(Graphics)} is called.
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* If this is not defined as a function the superclass method will be called. By
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* calling <code>applet:paint(graphics)</code> in the implementation the applet
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* content will not be cleared before painting.
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* </ul>
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*
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* <p>
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* Note that these lookups are done at runtime, so the paint method or any other
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* method can be changed based on application logic, if desired.
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*
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* @see Globals
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* @see LuaValue
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* @see Applet
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*/
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public class SampleApplet extends Applet {
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private static final long serialVersionUID = 1L;
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Globals globals;
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LuaValue pcall;
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LuaValue graphics;
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Graphics coerced;
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// This applet property is searched for the name of script to load.
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static String script_parameter = "script";
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// This must be located relative to the document base to be loaded.
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static String default_script = "swingapplet.lua";
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public void init() {
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// Find the script to load from the applet parameters.
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String script = getParameter(script_parameter);
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if (script == null)
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script = default_script;
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System.out.println("Loading " + script);
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// Construct globals to use.
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globals = JsePlatform.debugGlobals();
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pcall = globals.get("pcall");
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// Load and execute the script, supplying this Applet as the only
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// argument.
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globals.loadfile(script).call(CoerceJavaToLua.coerce(this));
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}
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public void start() {
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pcall.call(globals.get("start"));
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}
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public void stop() {
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pcall.call(globals.get("stop"));
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}
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public void update(Graphics g) {
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LuaValue u = globals.get("update");
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if (!u.isfunction())
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super.update(g);
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else
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pcall.call(
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u,
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coerced == g ? graphics : (graphics = CoerceJavaToLua
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.coerce(coerced = g)));
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}
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public void paint(Graphics g) {
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LuaValue p = globals.get("paint");
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if (!p.isfunction())
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super.paint(g);
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else
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pcall.call(
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p,
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coerced == g ? graphics : (graphics = CoerceJavaToLua
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.coerce(coerced = g)));
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}
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}
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