GameCanvas.java

/**
 *  Copyright (C) 2012   The FreeCol-Android Team
 *
 *  This file is part of FreeCol-Android.
 *
 *  FreeCol-Android is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  FreeCol-Android is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with FreeCol-Android.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.freecolandroid.ui.game;

import static org.freecolandroid.Constants.LOG_TAG;
import net.sf.freecol.client.FreeColClient;
import org.freecolandroid.repackaged.java.awt.Graphics2D;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

public class GameCanvas extends SurfaceView implements Callback {

    private final PaintThread mPaintThread = new PaintThread();

    private final SurfaceHolder mHolder;

    private FreeColClient mClient;

    public GameCanvas(Context context) {
        super(context);

        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    public GameCanvas(Context context, AttributeSet attrs) {
        super(context, attrs);

        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    public void init(FreeColClient client) {
        mClient = client;
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        super.onWindowFocusChanged(hasWindowFocus);
        if (hasWindowFocus) {
            mPaintThread.setPaused(false);
        } else {
            mPaintThread.setPaused(true);
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mClient != null && canvas != null) {
            Graphics2D g2d = new Graphics2D(canvas);
            mClient.getGUI().getCanvas().paintComponent(g2d);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mPaintThread.start();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        boolean retry = true;
        mPaintThread.stopPainting();
        while (retry) {
            try {
                mPaintThread.join();
                retry = false;
            } catch (InterruptedException e) {
            }
        }
    }

    private class PaintThread extends Thread {

        private boolean mRunning = true;

        private boolean mPaused = false;

        public void stopPainting() {
            mRunning = false;
        }

        public void setPaused(boolean paused) {
            mPaused = paused;
        }

        @SuppressLint("WrongCall")
		@Override
        public void run() {
            Log.d(LOG_TAG, "GameCanvas.PaintThread.run() - start");
            System.out.println();
            Canvas canvas = null;
            while (mRunning) {
                if (!mPaused) {
                    try {
                        canvas = mHolder.lockCanvas();
                        onDraw(canvas);
                    } catch (Exception e) {
                        // mRunning = false;
                        Log.w(LOG_TAG, "Exception while drawing", e);
                    } finally {
                        if (canvas != null) {
                            mHolder.unlockCanvasAndPost(canvas);
                        }
                    }
                }
            }
            SystemClock.sleep(50);
            Log.d(LOG_TAG, "GameCanvas.PaintThread.run() - stop");
        }

    }

}