jmonkeyengine/engine/src/desktop/com/jme3/system/awt/AwtPanelsContext.java

package com.jme3.system.awt;

import com.jme3.input.JoyInput;
import com.jme3.input.KeyInput;
import com.jme3.input.MouseInput;
import com.jme3.input.TouchInput;
import com.jme3.input.awt.AwtKeyInput;
import com.jme3.input.awt.AwtMouseInput;
import com.jme3.renderer.Renderer;
import com.jme3.system.*;
import java.util.ArrayList;

public class AwtPanelsContext implements JmeContext {

    protected JmeContext actualContext;
    protected AppSettings settings = new AppSettings(true);
    protected SystemListener listener;
    protected ArrayList<AwtPanel> panels = new ArrayList<AwtPanel>();
    protected AwtPanel inputSource;
    
    protected AwtMouseInput mouseInput = new AwtMouseInput();
    protected AwtKeyInput keyInput = new AwtKeyInput();
    
    protected boolean lastThrottleState = false;
    
    private class AwtPanelsListener implements SystemListener {

        public void initialize() {
            initInThread();
        }

        public void reshape(int width, int height) {
            throw new IllegalStateException();
        }

        public void update() {
            updateInThread();
        }

        public void requestClose(boolean esc) {
            // shouldn't happen
            throw new IllegalStateException();
        }

        public void gainFocus() {
            // shouldn't happen
            throw new IllegalStateException();
        }

        public void loseFocus() {
            // shouldn't happen
            throw new IllegalStateException();
        }

        public void handleError(String errorMsg, Throwable t) {
            listener.handleError(errorMsg, t);
        }

        public void destroy() {
            destroyInThread();
        }
    }
    
    public void setInputSource(AwtPanel panel){
        if (!panels.contains(panel))
            throw new IllegalArgumentException();
        
        inputSource = panel;
        mouseInput.setInputSource(panel);
        keyInput.setInputSource(panel);
    }
    
    public Type getType() {
        return Type.OffscreenSurface;
    }
    
    public void setSystemListener(SystemListener listener) {
        this.listener = listener;
    }

    public AppSettings getSettings() {
        return settings;
    }

    public Renderer getRenderer() {
        return actualContext.getRenderer();
    }

    public MouseInput getMouseInput() {
        return mouseInput;
    }

    public KeyInput getKeyInput() {
        return keyInput;
    }

    public JoyInput getJoyInput() {
        return null;
    }

    public TouchInput getTouchInput() {
        return null;
    }

    public Timer getTimer() {
        return actualContext.getTimer();
    }

    public boolean isCreated() {
        return actualContext != null && actualContext.isCreated();
    }

    public boolean isRenderable() {
        return actualContext != null && actualContext.isRenderable();
    }
    
    public AwtPanelsContext(){
    }
    
    public AwtPanel createPanel(PaintMode paintMode){
        AwtPanel panel = new AwtPanel(paintMode);
        panels.add(panel);
        return panel;
    }
    
    private void initInThread(){
        listener.initialize();
    }
    
    private void updateInThread(){
        // Check if throttle required
        boolean needThrottle = true;
        
        for (AwtPanel panel : panels){
            if (panel.isActiveDrawing()){
                needThrottle = false;
                break;
            }
        }
        
        if (lastThrottleState != needThrottle){
            lastThrottleState = needThrottle;
            if (lastThrottleState){
                System.out.println("OGL: Throttling update loop.");
            }else{
                System.out.println("OGL: Ceased throttling update loop.");
            }
        }
        
        if (needThrottle){
            try {
                Thread.sleep(100);
            } catch (InterruptedException ex) {
            }
        }
        
        listener.update();
    }
    
    private void destroyInThread(){
        listener.destroy();
    }
    
    public void setSettings(AppSettings settings) {
        this.settings.copyFrom(settings);
        this.settings.setRenderer(AppSettings.LWJGL_OPENGL2);
        if (actualContext != null){
            actualContext.setSettings(settings);
        }
    }

    public void create(boolean waitFor) {
        if (actualContext != null){
            throw new IllegalStateException("Already created");
        }
        
        actualContext = JmeSystem.newContext(settings, Type.OffscreenSurface);
        actualContext.setSystemListener(new AwtPanelsListener());
        actualContext.create(waitFor);
    }

    public void destroy(boolean waitFor) {
        if (actualContext == null)
            throw new IllegalStateException("Not created");
        
        // destroy parent context
        actualContext.destroy(waitFor);
    }
    
    public void setTitle(String title) {
        // not relevant, ignore
    }
    
    public void setAutoFlushFrames(boolean enabled) {
        // not relevant, ignore
    }

    public void restart() {
        // only relevant if changing pixel format.
    }
    
}