Android Open Source - slider Render Handler

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License

The source code is released under:

Apache License

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Java Source Code

package de.devisnik.android.sliding;
/* w  w  w .  ja  v a 2s  . co  m*/
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.SystemClock;
import android.view.SurfaceHolder;

public class RenderHandler extends Handler {
  private static final int MAX_FPS = 60;
  private static final int TARGET_DURATION = 1000 / MAX_FPS;
  private static final int ACTION_REDRAW = 1;
  private static final String TAG = "RenderHandler";
  long lastDraw = 0;
  private final SurfaceHolder mHolder;
  private final FrameDrawer mFrameDrawer;

  public RenderHandler(final Looper looper, final FrameDrawer frameDrawer, final SurfaceHolder holder) {
    super(looper);
    mFrameDrawer = frameDrawer;
    mHolder = holder;
  }

  @Override
  public void handleMessage(final Message msg) {
    if (msg.what == ACTION_REDRAW)
      redraw();
    else
      Logger.e(TAG, "unable to handle message: " + msg);
  }

  private void redraw() {

    long startTime = SystemClock.uptimeMillis();
    Canvas c = null;
    try {
      lastDraw = startTime;
      Rect dirtyRegion = mFrameDrawer.getDirtyRegion();
      c = mHolder.lockCanvas(dirtyRegion);
      if (c != null)
        mFrameDrawer.draw(c, dirtyRegion);
      // if (Logger.isDebugEnabled())
      // mFrameDrawer.drawFpsInfo(c, dirtyRegion.centerX(), dirtyRegion.centerY());
    } finally {
      // do this in a finally so that if an exception is thrown
      // during the above, we don't leave the Surface in an
      // inconsistent state
      if (c != null)
        mHolder.unlockCanvasAndPost(c);
      long drawDuration = SystemClock.uptimeMillis() - startTime;
      long delay = Math.max(1, TARGET_DURATION - drawDuration);
      sendMessageDelayed(obtainMessage(ACTION_REDRAW), delay);
    }
  }

  public void postDraw() {
    sendMessage(obtainMessage(ACTION_REDRAW));
  }
}

Java Source Code List