src/com/savoirfairelinux/sflphone/model/BubblesView.java

package com.savoirfairelinux.sflphone.model;

import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class BubblesView extends SurfaceView implements SurfaceHolder.Callback, OnTouchListener {
    private static final String TAG = BubblesView.class.getSimpleName();

    private BubblesThread thread = null;
    private BubbleModel model;

    private Paint attractor_paint = new Paint();
    private Paint name_paint = new Paint(Paint.ANTI_ALIAS_FLAG);

    private float density;
    private float textDensity;

    private boolean dragging_bubble = false;

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

        density = getResources().getDisplayMetrics().density;
        textDensity = getResources().getDisplayMetrics().scaledDensity;

        SurfaceHolder holder = getHolder();
        holder.addCallback(this);

        // create thread only; it's started in surfaceCreated()
        createThread();

        setOnTouchListener(this);
        setFocusable(true);

        attractor_paint.setColor(Color.RED);
        // attractor_paint.set
        name_paint.setTextSize(18 * textDensity);
        name_paint.setColor(0xFF303030);
        name_paint.setTextAlign(Align.CENTER);
    }

    private void createThread() {
        if (thread != null)
            return;
        thread = new BubblesThread(getHolder(), getContext(), new Handler() {
            @Override
            public void handleMessage(Message m) {
                /*
                 * mStatusText.setVisibility(m.getData().getInt("viz")); mStatusText.setText(m.getData().getString("text"));
                 */
            }
        });
        if (model != null)
            thread.setModel(model);
    }

    public void setModel(BubbleModel model) {
        this.model = model;
        thread.setModel(model);
    }

    /*
     * @Override public void onWindowFocusChanged(boolean hasWindowFocus) { if (!hasWindowFocus) { thread.pause(); } }
     */

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Log.w(TAG, "surfaceChanged " + width + "-" + height);
        thread.setSurfaceSize(width, height);
    }

    /*
     * Callback invoked when the Surface has been created and is ready to be used.
     */
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // start the thread here so that we don't busy-wait in run()
        // waiting for the surface to be created
        createThread();

        Log.w(TAG, "surfaceCreated");
        thread.setRunning(true);
        thread.start();
    }

    /*
     * Callback invoked when the Surface has been destroyed and must no longer be touched. WARNING: after this method returns, the Surface/Canvas must
     * never be touched again!
     */
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // we have to tell thread to shut down & wait for it to finish, or else
        // it might touch the Surface after we return and explode
        Log.w(TAG, "surfaceDestroyed");
        boolean retry = true;
        thread.setRunning(false);
        while (retry) {
            try {
                thread.join();
                retry = false;
            } catch (InterruptedException e) {
            }
        }
        thread = null;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        Log.w(TAG, "onTouch " + event.getAction());

        int action = event.getActionMasked();

        synchronized (model) {
            List<Bubble> bubbles = model.getBubbles();
            final int n_bubbles = bubbles.size();

            if (action == MotionEvent.ACTION_DOWN) {
                for (int i = 0; i < n_bubbles; i++) {
                    Bubble b = bubbles.get(i);
                    if (b.intersects(event.getX(), event.getY())) {
                        b.dragged = true;
                        b.last_drag = System.nanoTime();
                        b.setPos(event.getX(), event.getY());
                        b.target_scale = .8f;
                        dragging_bubble = true;
                    }
                }
            } else if (action == MotionEvent.ACTION_MOVE) {
                long now = System.nanoTime();
                for (int i = 0; i < n_bubbles; i++) {
                    Bubble b = bubbles.get(i);
                    if (b.dragged) {
                        float x = event.getX(), y = event.getY();
                        float dt = (float) ((now - b.last_drag) / 1000000000.);
                        float dx = x - b.getPosX(), dy = y - b.getPosY();
                        b.last_drag = now;

                        b.setPos(event.getX(), event.getY());
                        /*
                         * int hn = event.getHistorySize() - 2; Log.w(TAG, "event.getHistorySize() : " + event.getHistorySize()); if(hn > 0) { float
                         * dx = x-event.getHistoricalX(hn); float dy = y-event.getHistoricalY(hn); float dt = event.getHistoricalEventTime(hn)/1000.f;
                         */
                        b.speed.x = dx / dt;
                        b.speed.y = dy / dt;
                        // Log.w(TAG, "onTouch dx:" + b.speed.x + " dy:" + b.speed.y);
                        // }
                        return true;
                    }
                }
            } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
                for (int i = 0; i < n_bubbles; i++) {
                    Bubble b = bubbles.get(i);
                    if (b.dragged) {
                        b.dragged = false;
                        b.target_scale = 1.f;
                    }
                }
                dragging_bubble = false;
            }
        }

        return true;
    }

    public boolean isDraggingBubble() {
        return dragging_bubble;
    }

    class BubblesThread extends Thread {
        private boolean running = false;
        private SurfaceHolder surfaceHolder;

        BubbleModel model = null;

        public BubblesThread(SurfaceHolder holder, Context context, Handler handler) {
            surfaceHolder = holder;
        }

        public void setModel(BubbleModel model) {
            this.model = model;
        }

        @Override
        public void run() {
            while (running) {
                Canvas c = null;
                try {
                    c = surfaceHolder.lockCanvas(null);

                    // for the case the surface is destroyed while already in the loop
                    if (c == null || model == null)
                        continue;

                    synchronized (surfaceHolder) {
                        // Log.w(TAG, "Thread doDraw");
                        model.update();
                        doDraw(c);
                    }
                } finally {
                    if (c != null)
                        surfaceHolder.unlockCanvasAndPost(c);
                }
            }
        }

        public void setRunning(boolean b) {
            running = b;
        }

        public void setSurfaceSize(int width, int height) {
            synchronized (surfaceHolder) {
                if (model != null) {
                    model.width = width;
                    model.height = height;
                }
            }
        }

        /**
         * I got multiple IndexOutOfBoundsException, when switching calls. //FIXME
         * 
         * @param canvas
         */
        private void doDraw(Canvas canvas) {
            canvas.drawColor(Color.WHITE);

            synchronized (model) {
                List<Bubble> bubbles = model.getBubbles();
                List<Attractor> attractors = model.getAttractors();
                try {

                    for (int i = 0, n = attractors.size(); i < n; i++) {
                        Attractor a = attractors.get(i);
                        canvas.drawBitmap(a.getBitmap(), null, a.getBounds(), null);
                    }

                    for (int i = 0, n = bubbles.size(); i < n; i++) {
                        Bubble b = bubbles.get(i);
                        canvas.drawBitmap(b.getBitmap(), null, b.getBounds(), null);
                        canvas.drawText(b.contact.getmDisplayName(), b.getPosX(), b.getPosY() - 50 * density, name_paint);
                    }

                } catch (IndexOutOfBoundsException e) {
                    Log.e(TAG, e.toString());
                }
            }
        }
    }

}