Android Open Source - clusterkraf Clustering On Camera Change Listener

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Back to project page clusterkraf.

License

The source code is released under:

Apache License

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Java Source Code

package com.twotoasters.clusterkraf;
//from  w w  w  .  j  a v a 2  s .  c  om
import java.lang.ref.WeakReference;

import com.google.android.gms.maps.GoogleMap.OnCameraChangeListener;
import com.google.android.gms.maps.model.CameraPosition;

/**
 * An OnCameraChangeListener that calls back to its host only when appropriate
 */
class ClusteringOnCameraChangeListener implements OnCameraChangeListener {

  private final Options options;
  private final WeakReference<Host> hostRef;

  private long dirty = 0;

  public ClusteringOnCameraChangeListener(Host host, Options options) {
    this.hostRef = new WeakReference<Host>(host);
    this.options = options;
  }

  @Override
  public void onCameraChange(CameraPosition newPosition) {
    long now = System.currentTimeMillis();
    long notDirtyAfter = now - options.getClusteringOnCameraChangeListenerDirtyLifetimeMillis();
    if (dirty < notDirtyAfter) {
      Host host = hostRef.get();
      if (host != null) {
        dirty = now;
        host.onClusteringCameraChange();
      }
    }
  }

  public void setDirty(long when) {
    this.dirty = when;
  }

  interface Host {
    void onClusteringCameraChange();
  }

}

Java Source Code List